Support heteronyms in Chinese TTS (#738)

@@ -70,9 +70,9 @@ rm -rf sherpa-onnx-streaming-zipformer-ctc-small-2024-03-18
 curl -LS -O https://github.com/k2-fsa/sherpa-onnx/releases/download/tts-models/vits-piper-en_US-amy-low.tar.bz2
 tar xf vits-piper-en_US-amy-low.tar.bz2
 node ./test-offline-tts-en.js
-rm vits-piper-en_US-amy-low.tar.bz2
+rm vits-piper-en_US-amy-low*
 
-curl -LS -O https://github.com/k2-fsa/sherpa-onnx/releases/download/tts-models/vits-zh-aishell3.tar.bz2
-tar xvf vits-zh-aishell3.tar.bz2
+curl -LS -O https://github.com/k2-fsa/sherpa-onnx/releases/download/tts-models/vits-icefall-zh-aishell3.tar.bz2
+tar xvf vits-icefall-zh-aishell3.tar.bz2
 node ./test-offline-tts-zh.js
-rm vits-zh-aishell3.tar.bz2
+rm vits-icefall-zh-aishell3*

@@ -173,6 +173,7 @@ jobs:
             rm -v $dst/lib/libasound.so
             rm -v $dst/lib/libonnxruntime.so
             rm -v $dst/lib/libsherpa-onnx-fst.so
+            rm -v $dst/lib/libsherpa-onnx-fstfar.so
           fi
 
           tree $dst

@@ -211,6 +211,7 @@ jobs:
             rm -fv $dst/lib/libasound.so
             rm -fv $dst/lib/libonnxruntime.so
             rm -fv $dst/lib/libsherpa-onnx-fst.so
+            rm -fv $dst/lib/libsherpa-onnx-fstfar.so
           fi
 
           tree $dst

@@ -111,9 +111,11 @@ jobs:
           rm -rf vits-vctk
 
           echo "Test vits-zh-aishell3"
-          git clone https://huggingface.co/csukuangfj/vits-zh-aishell3
+          curl -SL -O https://github.com/k2-fsa/sherpa-onnx/releases/download/tts-models/vits-icefall-zh-aishell3.tar.bz2
+          tar xvf vits-icefall-zh-aishell3.tar.bz2
+          rm vits-icefall-zh-aishell3.tar.bz2
           ./run-vits-zh-aishell3.sh
-          rm -rf vits-zh-aishell3
+          rm -rf vits-icefall-zh-aishell3
 
           echo "Test vits-piper-en_US-lessac-medium"
           git clone https://huggingface.co/csukuangfj/vits-piper-en_US-lessac-medium

@@ -90,3 +90,4 @@ sherpa-onnx-paraformer-trilingual-zh-cantonese-en
 sr-data
 *xcworkspace/xcuserdata/*
 
+vits-icefall-*

 cmake_minimum_required(VERSION 3.13 FATAL_ERROR)
 project(sherpa-onnx)
 
-set(SHERPA_ONNX_VERSION "1.9.16")
+set(SHERPA_ONNX_VERSION "1.9.17")
 
 # Disable warning about
 #

@@ -155,6 +155,7 @@ class MainActivity : AppCompatActivity() {
         var modelDir: String?
         var modelName: String?
         var ruleFsts: String?
+        var ruleFars: String?
         var lexicon: String?
         var dataDir: String?
         var assets: AssetManager? = application.assets
@@ -165,6 +166,7 @@ class MainActivity : AppCompatActivity() {
         modelDir = null
         modelName = null
         ruleFsts = null
+        ruleFars = null
         lexicon = null
         dataDir = null
 
@@ -181,9 +183,11 @@ class MainActivity : AppCompatActivity() {
         // dataDir = "vits-piper-en_US-amy-low/espeak-ng-data"
 
         // Example 3:
-        // modelDir = "vits-zh-aishell3"
-        // modelName = "vits-aishell3.onnx"
-        // ruleFsts = "vits-zh-aishell3/rule.fst"
+        // https://github.com/k2-fsa/sherpa-onnx/releases/download/tts-models/vits-icefall-zh-aishell3.tar.bz2
+        // modelDir = "vits-icefall-zh-aishell3"
+        // modelName = "model.onnx"
+        // ruleFsts = "vits-icefall-zh-aishell3/phone.fst,vits-icefall-zh-aishell3/date.fst,vits-icefall-zh-aishell3/number.fst,"
+        // ruleFars = "vits-icefall-zh-aishell3/rule.far"
         // lexicon = "lexicon.txt"
 
         // Example 4:
@@ -202,7 +206,8 @@ class MainActivity : AppCompatActivity() {
         val config = getOfflineTtsConfig(
             modelDir = modelDir!!, modelName = modelName!!, lexicon = lexicon ?: "",
             dataDir = dataDir ?: "",
-            ruleFsts = ruleFsts ?: ""
+            ruleFsts = ruleFsts ?: "",
+            ruleFars = ruleFars ?: "",
         )!!
 
         tts = OfflineTts(assetManager = assets, config = config)

@@ -23,6 +23,7 @@ data class OfflineTtsModelConfig(
 data class OfflineTtsConfig(
     var model: OfflineTtsModelConfig,
     var ruleFsts: String = "",
+    var ruleFars: String = "",
     var maxNumSentences: Int = 1,
 )
 
@@ -151,7 +152,8 @@ fun getOfflineTtsConfig(
     modelName: String,
     lexicon: String,
     dataDir: String,
-    ruleFsts: String
+    ruleFsts: String,
+    ruleFars: String
 ): OfflineTtsConfig? {
     return OfflineTtsConfig(
         model = OfflineTtsModelConfig(
@@ -166,5 +168,6 @@ fun getOfflineTtsConfig(
             provider = "cpu",
         ),
         ruleFsts = ruleFsts,
+        ruleFars = ruleFars,
     )
 }

@@ -39,6 +39,7 @@ object TtsEngine {
     private var modelDir: String? = null
     private var modelName: String? = null
     private var ruleFsts: String? = null
+    private var ruleFars: String? = null
     private var lexicon: String? = null
     private var dataDir: String? = null
     private var assets: AssetManager? = null
@@ -50,6 +51,7 @@ object TtsEngine {
         modelDir = null
         modelName = null
         ruleFsts = null
+        ruleFars = null
         lexicon = null
         dataDir = null
         lang = null
@@ -73,9 +75,10 @@ object TtsEngine {
 
         // Example 3:
         // https://github.com/k2-fsa/sherpa-onnx/releases/download/tts-models/vits-icefall-zh-aishell3.tar.bz2
-        // modelDir = "vits-zh-aishell3"
-        // modelName = "vits-aishell3.onnx"
-        // ruleFsts = "vits-zh-aishell3/rule.fst"
+        // modelDir = "vits-icefall-zh-aishell3"
+        // modelName = "model.onnx"
+        // ruleFsts = "vits-icefall-zh-aishell3/phone.fst,vits-icefall-zh-aishell3/date.fst,vits-icefall-zh-aishell3/number.fst,vits-icefall-zh-aishell3/new_heteronym.fst"
+        // ruleFars = "vits-icefall-zh-aishell3/rule.far"
         // lexicon = "lexicon.txt"
         // lang = "zho"
 
@@ -108,7 +111,8 @@ object TtsEngine {
         val config = getOfflineTtsConfig(
             modelDir = modelDir!!, modelName = modelName!!, lexicon = lexicon ?: "",
             dataDir = dataDir ?: "",
-            ruleFsts = ruleFsts ?: ""
+            ruleFsts = ruleFsts ?: "",
+            ruleFars = ruleFars ?: ""
         )!!
 
         tts = OfflineTts(assetManager = assets, config = config)

@@ -124,6 +124,7 @@ echo "Generate xcframework"
 
 mkdir -p "build/simulator/lib"
 for f in libkaldi-native-fbank-core.a libsherpa-onnx-c-api.a libsherpa-onnx-core.a \
+         libsherpa-onnx-fstfar.a \
          libsherpa-onnx-fst.a libsherpa-onnx-kaldifst-core.a libkaldi-decoder-core.a \
          libucd.a libpiper_phonemize.a libespeak-ng.a; do
   lipo -create build/simulator_arm64/lib/${f} \
@@ -137,6 +138,7 @@ libtool -static -o build/simulator/sherpa-onnx.a \
   build/simulator/lib/libkaldi-native-fbank-core.a \
   build/simulator/lib/libsherpa-onnx-c-api.a \
   build/simulator/lib/libsherpa-onnx-core.a  \
+  build/simulator/lib/libsherpa-onnx-fstfar.a   \
   build/simulator/lib/libsherpa-onnx-fst.a   \
   build/simulator/lib/libsherpa-onnx-kaldifst-core.a \
   build/simulator/lib/libkaldi-decoder-core.a \
@@ -148,6 +150,7 @@ libtool -static -o build/os64/sherpa-onnx.a \
   build/os64/lib/libkaldi-native-fbank-core.a \
   build/os64/lib/libsherpa-onnx-c-api.a \
   build/os64/lib/libsherpa-onnx-core.a \
+  build/os64/lib/libsherpa-onnx-fstfar.a   \
   build/os64/lib/libsherpa-onnx-fst.a   \
   build/os64/lib/libsherpa-onnx-kaldifst-core.a \
   build/os64/lib/libkaldi-decoder-core.a \

@@ -27,6 +27,7 @@ libtool -static -o ./install/lib/libsherpa-onnx.a \
   ./install/lib/libsherpa-onnx-c-api.a \
   ./install/lib/libsherpa-onnx-core.a \
   ./install/lib/libkaldi-native-fbank-core.a \
+  ./install/lib/libsherpa-onnx-fstfar.a \
   ./install/lib/libsherpa-onnx-fst.a \
   ./install/lib/libsherpa-onnx-kaldifst-core.a \
   ./install/lib/libkaldi-decoder-core.a \

@@ -4,7 +4,7 @@ CUR_DIR :=$(shell pwd)
 CFLAGS := -I ../ -I ../build/_deps/cargs-src/include/
 LDFLAGS := -L ../build/lib
 LDFLAGS += -L ../build/_deps/onnxruntime-src/lib
-LDFLAGS += -lsherpa-onnx-c-api -lsherpa-onnx-core -lkaldi-decoder-core -lsherpa-onnx-kaldifst-core -lsherpa-onnx-fst -lkaldi-native-fbank-core -lpiper_phonemize -lespeak-ng -lucd -lcargs -lonnxruntime
+LDFLAGS += -lsherpa-onnx-c-api -lsherpa-onnx-core -lkaldi-decoder-core -lsherpa-onnx-kaldifst-core -lsherpa-onnx-fstfar -lsherpa-onnx-fst -lkaldi-native-fbank-core -lpiper_phonemize -lespeak-ng -lucd -lcargs -lonnxruntime
 LDFLAGS += -framework Foundation
 LDFLAGS += -lc++
 LDFLAGS += -Wl,-rpath,${CUR_DIR}/../build/lib

@@ -78,6 +78,7 @@ def get_binaries():
             "piper_phonemize.dll",
             "sherpa-onnx-c-api.dll",
             "sherpa-onnx-core.dll",
+            "sherpa-onnx-fstfar.lib",
             "sherpa-onnx-fst.lib",
             "sherpa-onnx-kaldifst-core.lib",
             "sherpa-onnx-portaudio.dll",

@@ -64,12 +64,22 @@ function(download_kaldi_decoder)
       kaldifst_core
       fst
     DESTINATION ..)
+    if(SHERPA_ONNX_ENABLE_TTS)
+      install(TARGETS
+        fstfar
+      DESTINATION ..)
+    endif()
   else()
     install(TARGETS
       kaldi-decoder-core
       kaldifst_core
       fst
     DESTINATION lib)
+    if(SHERPA_ONNX_ENABLE_TTS)
+      install(TARGETS
+        fstfar
+      DESTINATION lib)
+    endif()
   endif()
 
   if(WIN32 AND BUILD_SHARED_LIBS)
@@ -78,6 +88,11 @@ function(download_kaldi_decoder)
       kaldifst_core
       fst
     DESTINATION bin)
+    if(SHERPA_ONNX_ENABLE_TTS)
+      install(TARGETS
+        fstfar
+      DESTINATION bin)
+    endif()
   endif()
 endfunction()
 

@@ -50,13 +50,7 @@ function(download_kaldifst)
       ${kaldifst_SOURCE_DIR}/
   )
 
-  target_include_directories(fst
-    PUBLIC
-      ${openfst_SOURCE_DIR}/src/include
-  )
-
   set_target_properties(kaldifst_core PROPERTIES OUTPUT_NAME "sherpa-onnx-kaldifst-core")
-  set_target_properties(fst PROPERTIES OUTPUT_NAME "sherpa-onnx-fst")
 endfunction()
 
 download_kaldifst()

@@ -4,7 +4,7 @@ function(download_openfst)
   include(FetchContent)
 
   set(openfst_URL  "https://github.com/kkm000/openfst/archive/refs/tags/win/1.6.5.1.tar.gz")
-  set(openfst_URL2  "https://huggingface.co/csukuangfj/kaldi-hmm-gmm-cmake-deps/resolve/main/openfst-win-1.6.5.1.tar.gz")
+  set(openfst_URL2 "https://hub.nuaa.cf/kkm000/openfst/archive/refs/tags/win/1.6.5.1.tar.gz")
   set(openfst_HASH "SHA256=02c49b559c3976a536876063369efc0e41ab374be1035918036474343877046e")
 
   # If you don't have access to the Internet,
@@ -31,7 +31,7 @@ function(download_openfst)
   set(HAVE_COMPACT OFF CACHE BOOL "" FORCE)
   set(HAVE_COMPRESS OFF CACHE BOOL "" FORCE)
   set(HAVE_CONST OFF CACHE BOOL "" FORCE)
-  set(HAVE_FAR OFF CACHE BOOL "" FORCE)
+  set(HAVE_FAR ON CACHE BOOL "" FORCE)
   set(HAVE_GRM OFF CACHE BOOL "" FORCE)
   set(HAVE_PDT OFF CACHE BOOL "" FORCE)
   set(HAVE_MPDT OFF CACHE BOOL "" FORCE)
@@ -70,20 +70,21 @@ function(download_openfst)
   add_subdirectory(${openfst_SOURCE_DIR} ${openfst_BINARY_DIR} EXCLUDE_FROM_ALL)
   set(openfst_SOURCE_DIR ${openfst_SOURCE_DIR} PARENT_SCOPE)
 
-  # Rename libfst.so.6 to libkaldifst_fst.so.6 to avoid potential conflicts
-  # when kaldifst is installed.
-  set_target_properties(fst PROPERTIES OUTPUT_NAME "kaldifst_fst")
+  # Rename libfst.so.6 to libsherpa-onnx-fst.so.6 to avoid potential conflicts
+  # when sherpa-onnx is installed.
+  set_target_properties(fst PROPERTIES OUTPUT_NAME "sherpa-onnx-fst")
+  set_target_properties(fstfar PROPERTIES OUTPUT_NAME "sherpa-onnx-fstfar")
 
-  install(TARGETS fst
-    DESTINATION lib
+  target_include_directories(fst
+    PUBLIC
+      ${openfst_SOURCE_DIR}/src/include
   )
 
-  if(KALDIFST_BUILD_PYTHON)
-    set_target_properties(fstscript PROPERTIES OUTPUT_NAME "kaldifst_fstscript")
-    install(TARGETS fstscript
-      DESTINATION lib
-    )
-  endif()
+  target_include_directories(fstfar
+    PUBLIC
+      ${openfst_SOURCE_DIR}/src/include
+  )
+  # installed in ./kaldi-decoder.cmake
 endfunction()
 
 download_openfst()

@@ -13,4 +13,4 @@ Cflags: -I"${includedir}"
 # Note: -lcargs is required only for the following file
 # https://github.com/k2-fsa/sherpa-onnx/blob/master/c-api-examples/decode-file-c-api.c
 # We add it here so that users don't need to specify -lcargs when compiling decode-file-c-api.c
-Libs: -L"${libdir}" -lsherpa-onnx-c-api -lsherpa-onnx-core -lkaldi-decoder-core -lsherpa-onnx-kaldifst-core -lsherpa-onnx-fst -lkaldi-native-fbank-core -lpiper_phonemize -lespeak-ng -lucd -lcargs -lonnxruntime -Wl,-rpath,${libdir} @SHERPA_ONNX_PKG_CONFIG_EXTRA_LIBS@
+Libs: -L"${libdir}" -lsherpa-onnx-c-api -lsherpa-onnx-core -lkaldi-decoder-core -lsherpa-onnx-kaldifst-core -lsherpa-onnx-fstfar -lsherpa-onnx-fst -lkaldi-native-fbank-core -lpiper_phonemize -lespeak-ng -lucd -lcargs -lonnxruntime -Wl,-rpath,${libdir} @SHERPA_ONNX_PKG_CONFIG_EXTRA_LIBS@

@@ -20,6 +20,9 @@ class OfflineTtsDemo
     [Option("tts-rule-fsts", Required = false, Default = "", HelpText = "path to rule.fst")]
     public string RuleFsts { get; set; }
 
+    [Option("tts-rule-fars", Required = false, Default = "", HelpText = "path to rule.far")]
+    public string RuleFars { get; set; }
+
     [Option("vits-data-dir", Required = false, Default = "", HelpText = "Path to the directory containing dict for espeak-ng.")]
     public string DataDir { get; set; }
 
@@ -72,14 +75,15 @@ class OfflineTtsDemo
     string usage = @"
 # vits-aishell3
 
-wget -qq https://github.com/k2-fsa/sherpa-onnx/releases/download/tts-models/vits-zh-aishell3.tar.bz2
-tar xf vits-zh-aishell3.tar.bz2
+curl -SL -O https://github.com/k2-fsa/sherpa-onnx/releases/download/tts-models/vits-icefall-zh-aishell3.tar.bz2
+tar xvf vits-icefall-zh-aishell3.tar.bz2
 
 dotnet run \
-  --vits-model=./vits-zh-aishell3/vits-aishell3.onnx \
-  --vits-tokens=./vits-zh-aishell3/tokens.txt \
-  --vits-lexicon=./vits-zh-aishell3/lexicon.txt \
-  --tts-rule-fsts=./vits-zh-aishell3/rule.fst \
+  --vits-model=./vits-icefall-zh-aishell3/model.onnx \
+  --vits-tokens=./vits-icefall-zh-aishell3/tokens.txt \
+  --vits-lexicon=./vits-icefall-zh-aishell3/lexicon.txt \
+  --tts-rule-fsts=./vits-icefall-zh-aishell3/phone.fst,./vits-icefall-zh-aishell3/date.fst,./vits-icefall-zh-aishell3/number.fst \
+  --tts-rule-fars=./vits-icefall-zh-aishell3/rule.far \
   --sid=66 \
   --debug=1 \
   --output-filename=./aishell3-66.wav \
@@ -127,6 +131,7 @@ to download more models.
     config.Model.Debug = options.Debug;
     config.Model.Provider = "cpu";
     config.RuleFsts = options.RuleFsts;
+    config.RuleFars = options.RuleFars;
     config.MaxNumSentences = options.MaxNumSentences;
 
     OfflineTts tts = new OfflineTts(config);

 #!/usr/bin/env bash
 set -ex
 if [ ! -f ./vits-zh-aishell3/vits-aishell3.onnx ]; then
-  # wget -qq https://github.com/k2-fsa/sherpa-onnx/releases/download/tts-models/vits-zh-aishell3.tar.bz2
-  curl -OL https://github.com/k2-fsa/sherpa-onnx/releases/download/tts-models/vits-zh-aishell3.tar.bz2
-  tar xf vits-zh-aishell3.tar.bz2
-  rm vits-zh-aishell3.tar.bz2
+  curl -SL -O https://github.com/k2-fsa/sherpa-onnx/releases/download/tts-models/vits-icefall-zh-aishell3.tar.bz2
+  tar xvf vits-icefall-zh-aishell3.tar.bz2
+  rm vits-icefall-zh-aishell3.tar.bz2
 fi
 
 dotnet run \
-  --vits-model=./vits-zh-aishell3/vits-aishell3.onnx \
-  --vits-tokens=./vits-zh-aishell3/tokens.txt \
-  --vits-lexicon=./vits-zh-aishell3/lexicon.txt \
-  --tts-rule-fsts=./vits-zh-aishell3/rule.fst \
+  --vits-model=./vits-icefall-zh-aishell3/model.onnx \
+  --vits-tokens=./vits-icefall-zh-aishell3/tokens.txt \
+  --vits-lexicon=./vits-icefall-zh-aishell3/lexicon.txt \
+  --tts-rule-fsts=./vits-icefall-zh-aishell3/phone.fst,./vits-icefall-zh-aishell3/date.fst,./vits-icefall-zh-aishell3/number.fst \
+  --tts-rule-fars=./vits-icefall-zh-aishell3/rule.far \
   --sid=66 \
   --debug=1 \
   --output-filename=./aishell3-66.wav \
-  --text="这是一个语音合成测试, 写于公元 2024 年 1 月 28 号, 23点27分，星期天。"
+  --text="这是一个语音合成测试, 写于公元 2024 年 1 月 28 号, 23点27分，星期天。长沙长大，去过长白山和长安街。行行出状元。行行，银行行长，行业。"

@@ -26,6 +26,7 @@ func main() {
 	flag.IntVar(&config.Model.Debug, "debug", 0, "Whether to show debug message")
 	flag.StringVar(&config.Model.Provider, "provider", "cpu", "Provider to use")
 	flag.StringVar(&config.RuleFsts, "tts-rule-fsts", "", "Path to rule.fst")
+	flag.StringVar(&config.RuleFars, "tts-rule-fars", "", "Path to rule.far")
 	flag.IntVar(&config.MaxNumSentences, "tts-max-num-sentences", 1, "Batch size")
 
 	flag.IntVar(&sid, "sid", 0, "Speaker ID. Used only for multi-speaker models")

@@ -6,21 +6,32 @@
 
 for sid in 10 33 99; do
 ./non-streaming-tts \
-  --vits-model=./vits-zh-aishell3/vits-aishell3.onnx \
-  --vits-lexicon=./vits-zh-aishell3/lexicon.txt \
-  --vits-tokens=./vits-zh-aishell3/tokens.txt \
+  --vits-model=./vits-icefall-zh-aishell3/model.onnx \
+  --vits-lexicon=./vits-icefall-zh-aishell3/lexicon.txt \
+  --vits-tokens=./vits-icefall-zh-aishell3/tokens.txt \
   --sid=$sid \
   --debug=1 \
   --output-filename=./liliana-$sid.wav \
   "林美丽最美丽、最漂亮、最可爱！"
 
 ./non-streaming-tts \
-  --vits-model=./vits-zh-aishell3/vits-aishell3.onnx \
-  --vits-lexicon=./vits-zh-aishell3/lexicon.txt \
-  --vits-tokens=./vits-zh-aishell3/tokens.txt \
-  --tts-rule-fsts=./vits-zh-aishell3/rule.fst \
+  --vits-model=./vits-icefall-zh-aishell3/model.onnx \
+  --vits-lexicon=./vits-icefall-zh-aishell3/lexicon.txt \
+  --vits-tokens=./vits-icefall-zh-aishell3/tokens.txt \
+  --tts-rule-fsts=./vits-icefall-zh-aishell3/phone.fst,./vits-icefall-zh-aishell3/date.fst,./vits-icefall-zh-aishell3/number.fst \
   --sid=$sid \
   --debug=1 \
   --output-filename=./numbers-$sid.wav \
   "数字12345.6789怎么念"
+
+./non-streaming-tts \
+  --vits-model=./vits-icefall-zh-aishell3/model.onnx \
+  --vits-lexicon=./vits-icefall-zh-aishell3/lexicon.txt \
+  --vits-tokens=./vits-icefall-zh-aishell3/tokens.txt \
+  --tts-rule-fsts=./vits-icefall-zh-aishell3/phone.fst,./vits-icefall-zh-aishell3/date.fst,./vits-icefall-zh-aishell3/number.fst \
+  --tts-rule-fars=./vits-icefall-zh-aishell3/rule.far \
+  --sid=$sid \
+  --debug=1 \
+  --output-filename=./heteronym-$sid.wav \
+  "万古长存长沙长大长白山长孙长安街"
 done

@@ -7,10 +7,9 @@
 
 import Foundation
 
-
 // used to get the path to espeak-ng-data
 func resourceURL(to path: String) -> String {
-    return URL(string: path, relativeTo: Bundle.main.resourceURL)!.path
+  return URL(string: path, relativeTo: Bundle.main.resourceURL)!.path
 }
 
 func getResource(_ forResource: String, _ ofType: String) -> String {
@@ -50,8 +49,7 @@ func getTtsForAishell3() -> SherpaOnnxOfflineTtsWrapper {
   // See the following link
   // https://k2-fsa.github.io/sherpa/onnx/tts/pretrained_models/vits.html#vits-model-aishell3
 
-  // vits-vctk.onnx
-  let model = getResource("vits-aishell3", "onnx")
+  let model = getResource("model", "onnx")
 
   // lexicon.txt
   let lexicon = getResource("lexicon", "txt")
@@ -59,9 +57,19 @@ func getTtsForAishell3() -> SherpaOnnxOfflineTtsWrapper {
   // tokens.txt
   let tokens = getResource("tokens", "txt")
 
+  // rule.fst
+  let ruleFsts = getResource("rule", "fst")
+
+  // rule.far
+  let ruleFars = getResource("rule", "far")
+
   let vits = sherpaOnnxOfflineTtsVitsModelConfig(model: model, lexicon: lexicon, tokens: tokens)
   let modelConfig = sherpaOnnxOfflineTtsModelConfig(vits: vits)
-  var config = sherpaOnnxOfflineTtsConfig(model: modelConfig)
+  var config = sherpaOnnxOfflineTtsConfig(
+    model: modelConfig,
+    ruleFsts: ruleFsts,
+    ruleFars: ruleFars
+  )
   return SherpaOnnxOfflineTtsWrapper(config: &config)
 }
 
@@ -69,7 +77,6 @@ func getTtsForAishell3() -> SherpaOnnxOfflineTtsWrapper {
 func getTtsFor_en_US_amy_low() -> SherpaOnnxOfflineTtsWrapper {
   // please see  https://github.com/k2-fsa/sherpa-onnx/releases/download/tts-models/vits-piper-en_US-amy-low.tar.bz2
 
-  // vits-vctk.onnx
   let model = getResource("en_US-amy-low", "onnx")
 
   // tokens.txt
@@ -78,7 +85,8 @@ func getTtsFor_en_US_amy_low() -> SherpaOnnxOfflineTtsWrapper {
   // in this case, we don't need lexicon.txt
   let dataDir = resourceURL(to: "espeak-ng-data")
 
-  let vits = sherpaOnnxOfflineTtsVitsModelConfig(model: model, lexicon: "", tokens: tokens, dataDir: dataDir)
+  let vits = sherpaOnnxOfflineTtsVitsModelConfig(
+    model: model, lexicon: "", tokens: tokens, dataDir: dataDir)
   let modelConfig = sherpaOnnxOfflineTtsModelConfig(vits: vits)
   var config = sherpaOnnxOfflineTtsConfig(model: modelConfig)
 

@@ -11,6 +11,7 @@
         sherpa-onnx-core.lib;
         kaldi-decoder-core.lib;
         sherpa-onnx-kaldifst-core.lib;
+        sherpa-onnx-fstfar.lib;
         sherpa-onnx-fst.lib;
         kaldi-native-fbank-core.lib;
         onnxruntime.lib;

@@ -11,6 +11,7 @@
         sherpa-onnx-core.lib;
         kaldi-decoder-core.lib;
         sherpa-onnx-kaldifst-core.lib;
+        sherpa-onnx-fstfar.lib;
         sherpa-onnx-fst.lib;
         kaldi-native-fbank-core.lib;
         onnxruntime.lib;

@@ -11,6 +11,7 @@
         sherpa-onnx-core.lib;
         kaldi-decoder-core.lib;
         sherpa-onnx-kaldifst-core.lib;
+        sherpa-onnx-fstfar.lib;
         sherpa-onnx-fst.lib;
         kaldi-native-fbank-core.lib;
         onnxruntime.lib;

@@ -43,8 +43,8 @@ for text-to-speech.
 You can use the following command to run it:
 
 ```bash
-wget -q https://github.com/k2-fsa/sherpa-onnx/releases/download/tts-models/vits-zh-aishell3.tar.bz2
-tar xvf vits-zh-aishell3.tar.bz2
+wget -q https://github.com/k2-fsa/sherpa-onnx/releases/download/tts-models/vits-icefall-zh-aishell3.tar.bz2
+tar xvf vits-icefall-zh-aishell3.tar.bz2
 node ./test-offline-tts-zh.js
 ```
 

@@ -22,6 +22,7 @@ function createOfflineTts() {
   let offlineTtsConfig = {
     offlineTtsModelConfig: offlineTtsModelConfig,
     ruleFsts: '',
+    ruleFars: '',
     maxNumSentences: 1,
   };
 

@@ -4,9 +4,9 @@ const sherpa_onnx = require('sherpa-onnx');
 
 function createOfflineTts() {
   let offlineTtsVitsModelConfig = {
-    model: './vits-zh-aishell3/vits-aishell3.onnx',
-    lexicon: './vits-zh-aishell3/lexicon.txt',
-    tokens: './vits-zh-aishell3/tokens.txt',
+    model: './vits-icefall-zh-aishell3/vits-aishell3.onnx',
+    lexicon: './vits-icefall-zh-aishell3/lexicon.txt',
+    tokens: './vits-icefall-zh-aishell3/tokens.txt',
     dataDir: '',
     noiseScale: 0.667,
     noiseScaleW: 0.8,
@@ -21,7 +21,9 @@ function createOfflineTts() {
 
   let offlineTtsConfig = {
     offlineTtsModelConfig: offlineTtsModelConfig,
-    ruleFsts: './vits-zh-aishell3/rule.fst',
+    ruleFsts:
+        './vits-icefall-zh-aishell3/phone.fst,./vits-icefall-zh-aishell3/date.fst,./vits-icefall-zh-aishell3/number.fst,./vits-icefall-zh-aishell3/new_heteronym.fst',
+    ruleFars: './vits-icefall-zh-aishell3/rule.far',
     maxNumSentences: 1,
   };
 

@@ -56,6 +56,11 @@ sed -i.bak s/"lang = null"/"lang = \"$lang_iso_639_3\""/ ./TtsEngine.kt
   sed -i.bak s%"ruleFsts = null"%"ruleFsts = \"$rule_fsts\""% ./TtsEngine.kt
 {% endif %}
 
+{% if tts_model.rule_fars %}
+  rule_fars={{ tts_model.rule_fars }}
+  sed -i.bak s%"ruleFsts = null"%"ruleFars = \"$rule_fars\""% ./TtsEngine.kt
+{% endif %}
+
 {% if tts_model.data_dir %}
   data_dir={{ tts_model.data_dir }}
   sed -i.bak s%"dataDir = null"%"dataDir = \"$data_dir\""% ./TtsEngine.kt

@@ -54,6 +54,11 @@ sed -i.bak s/"modelName = null"/"modelName = \"$model_name\""/ ./MainActivity.kt
   sed -i.bak s%"ruleFsts = null"%"ruleFsts = \"$rule_fsts\""% ./MainActivity.kt
 {% endif %}
 
+{% if tts_model.rule_fars %}
+  rule_fars={{ tts_model.rule_fars }}
+  sed -i.bak s%"ruleFsts = null"%"ruleFars = \"$rule_fars\""% ./MainActivity.kt
+{% endif %}
+
 {% if tts_model.data_dir %}
   data_dir={{ tts_model.data_dir }}
   sed -i.bak s%"dataDir = null"%"dataDir = \"$data_dir\""% ./MainActivity.kt

@@ -33,6 +33,7 @@ class TtsModel:
     model_name: str = ""
     lang: str = ""  # en, zh, fr, de, etc.
     rule_fsts: Optional[List[str]] = None
+    rule_fars: Optional[List[str]] = None
     data_dir: Optional[str] = None
     is_char: bool = False
     lang_iso_639_3: str = ""
@@ -241,98 +242,94 @@ def get_mimic3_models() -> List[TtsModel]:
 
 
 def get_vits_models() -> List[TtsModel]:
-    return [
+    chinese_models = [
         # Chinese
         TtsModel(
             model_dir="vits-icefall-zh-aishell3",
             model_name="model.onnx",
             lang="zh",
-            rule_fsts="vits-icefall-zh-aishell3/phone.fst,vits-icefall-zh-aishell3/date.fst,vits-icefall-zh-aishell3/rule.fst",
+            rule_fsts="vits-icefall-zh-aishell3/phone.fst,vits-icefall-zh-aishell3/date.fst,vits-icefall-zh-aishell3/number.fst,vits-icefall-zh-aishell3/new_heteronym.fst",
+            rule_fars="vits-icefall-zh-aishell3/rule.far",
         ),
         TtsModel(
             model_dir="vits-zh-aishell3",
             model_name="vits-aishell3.onnx",
             lang="zh",
-            rule_fsts="vits-zh-aishell3/rule.fst",
         ),
         TtsModel(
             model_dir="vits-zh-hf-doom",
             model_name="doom.onnx",
             lang="zh",
-            rule_fsts="vits-zh-hf-doom/rule.fst",
         ),
         TtsModel(
             model_dir="vits-zh-hf-echo",
             model_name="echo.onnx",
             lang="zh",
-            rule_fsts="vits-zh-hf-echo/rule.fst",
         ),
         TtsModel(
             model_dir="vits-zh-hf-zenyatta",
             model_name="zenyatta.onnx",
             lang="zh",
-            rule_fsts="vits-zh-hf-zenyatta/rule.fst",
         ),
         TtsModel(
             model_dir="vits-zh-hf-abyssinvoker",
             model_name="abyssinvoker.onnx",
             lang="zh",
-            rule_fsts="vits-zh-hf-abyssinvoker/rule.fst",
         ),
         TtsModel(
             model_dir="vits-zh-hf-keqing",
             model_name="keqing.onnx",
             lang="zh",
-            rule_fsts="vits-zh-hf-keqing/rule.fst",
         ),
         TtsModel(
             model_dir="vits-zh-hf-eula",
             model_name="eula.onnx",
             lang="zh",
-            rule_fsts="vits-zh-hf-eula/rule.fst",
         ),
         TtsModel(
             model_dir="vits-zh-hf-bronya",
             model_name="bronya.onnx",
             lang="zh",
-            rule_fsts="vits-zh-hf-bronya/rule.fst",
         ),
         TtsModel(
             model_dir="vits-zh-hf-theresa",
             model_name="theresa.onnx",
             lang="zh",
-            rule_fsts="vits-zh-hf-theresa/rule.fst",
         ),
         TtsModel(
             model_dir="vits-zh-hf-fanchen-wnj",
             model_name="vits-zh-hf-fanchen-wnj.onnx",
             lang="zh",
-            rule_fsts="vits-zh-hf-fanchen-wnj/rule.fst",
         ),
         TtsModel(
             model_dir="vits-zh-hf-fanchen-C",
             model_name="vits-zh-hf-fanchen-C.onnx",
             lang="zh",
-            rule_fsts="vits-zh-hf-fanchen-C/rule.fst",
         ),
         TtsModel(
             model_dir="vits-zh-hf-fanchen-ZhiHuiLaoZhe",
             model_name="vits-zh-hf-fanchen-ZhiHuiLaoZhe.onnx",
             lang="zh",
-            rule_fsts="vits-zh-hf-fanchen-ZhiHuiLaoZhe/rule.fst",
         ),
         TtsModel(
             model_dir="vits-zh-hf-fanchen-ZhiHuiLaoZhe_new",
             model_name="vits-zh-hf-fanchen-ZhiHuiLaoZhe_new.onnx",
             lang="zh",
-            rule_fsts="vits-zh-hf-fanchen-ZhiHuiLaoZhe_new/rule.fst",
         ),
         TtsModel(
             model_dir="vits-zh-hf-fanchen-unity",
             model_name="vits-zh-hf-fanchen-unity.onnx",
             lang="zh",
-            rule_fsts="vits-zh-hf-fanchen-unity/rule.fst",
         ),
+    ]
+
+    rule_fsts = ["phone.fst", "date.fst", "number.fst", "new_heteronym.fst"]
+    for m in chinese_models:
+        s = [f"{m.model_dir}/{r}" for r in rule_fsts]
+        m.rule_fsts = ",".join(s)
+        m.rule_fars = f"{m.model_dir}/rule.far"
+
+    all_models = chinese_models + [
         TtsModel(
             model_dir="vits-cantonese-hf-xiaomaiiwn",
             model_name="vits-cantonese-hf-xiaomaiiwn.onnx",
@@ -346,6 +343,8 @@ def get_vits_models() -> List[TtsModel]:
         # fmt: on
     ]
 
+    return all_models
+
 
 def main():
     args = get_args()

@@ -40,6 +40,7 @@ def process_linux(s):
         "libpiper_phonemize.so.1",
         "libsherpa-onnx-c-api.so",
         "libsherpa-onnx-core.so",
+        "libsherpa-onnx-fstfar.so.7",
         "libsherpa-onnx-fst.so.6",
         "libsherpa-onnx-kaldifst-core.so",
         "libucd.so",
@@ -68,6 +69,7 @@ def process_macos(s):
         "libpiper_phonemize.1.dylib",
         "libsherpa-onnx-c-api.dylib",
         "libsherpa-onnx-core.dylib",
+        "libsherpa-onnx-fstfar.7.dylib",
         "libsherpa-onnx-fst.6.dylib",
         "libsherpa-onnx-kaldifst-core.dylib",
         "libucd.dylib",
@@ -96,6 +98,7 @@ def process_windows(s, rid):
         "piper_phonemize.dll",
         "sherpa-onnx-c-api.dll",
         "sherpa-onnx-core.dll",
+        "sherpa-onnx-fstfar.lib",
         "sherpa-onnx-fst.lib",
         "sherpa-onnx-kaldifst-core.lib",
         "ucd.dll",

@@ -67,6 +67,7 @@ namespace SherpaOnnx
       Model = new OfflineTtsModelConfig();
       RuleFsts = "";
       MaxNumSentences = 1;
+      RuleFars = "";
     }
     public OfflineTtsModelConfig Model;
 
@@ -74,6 +75,9 @@ namespace SherpaOnnx
     public string RuleFsts;
 
     public int MaxNumSentences;
+
+    [MarshalAs(UnmanagedType.LPStr)]
+    public string RuleFars;
   }
 
   public class OfflineTtsGeneratedAudio

@@ -41,6 +41,7 @@ if [ ! -f /tmp/linux/libsherpa-onnx-core.so ]; then
   cd ..
   rm -v libpiper_phonemize.so libpiper_phonemize.so.1.2.0
   rm -v libsherpa-onnx-fst.so
+  rm -v libsherpa-onnx-fstfar.so
   rm -v libonnxruntime.so
   rm -v libcargs.so
   rm -rf wheel
@@ -67,6 +68,7 @@ if [ ! -f /tmp/macos/libsherpa-onnx-core.dylib ]; then
   rm -v libonnxruntime.dylib
   rm -v libpiper_phonemize.1.2.0.dylib libpiper_phonemize.dylib
   rm -v libsherpa-onnx-fst.dylib
+  rm -v libsherpa-onnx-fstfar.dylib
   rm -rf wheel
   ls -lh
   cd ..

@@ -2,5 +2,5 @@
 
 package sherpa_onnx
 
-// #cgo LDFLAGS: -L ${SRCDIR}/lib/x86_64-apple-darwin -lsherpa-onnx-c-api -lsherpa-onnx-core -lkaldi-native-fbank-core  -lkaldi-decoder-core -lsherpa-onnx-kaldifst-core -lsherpa-onnx-fst -lpiper_phonemize -lespeak-ng -lucd -lonnxruntime -Wl,-rpath,${SRCDIR}/lib/x86_64-apple-darwin
+// #cgo LDFLAGS: -L ${SRCDIR}/lib/x86_64-apple-darwin -lsherpa-onnx-c-api -lsherpa-onnx-core -lkaldi-native-fbank-core  -lkaldi-decoder-core -lsherpa-onnx-kaldifst-core -lsherpa-onnx-fstfar -lsherpa-onnx-fst -lpiper_phonemize -lespeak-ng -lucd -lonnxruntime -Wl,-rpath,${SRCDIR}/lib/x86_64-apple-darwin
 import "C"

@@ -554,6 +554,7 @@ type OfflineTtsModelConfig struct {
 type OfflineTtsConfig struct {
 	Model           OfflineTtsModelConfig
 	RuleFsts        string
+	RuleFars        string
 	MaxNumSentences int
 }
 
@@ -583,6 +584,9 @@ func NewOfflineTts(config *OfflineTtsConfig) *OfflineTts {
 	c.rule_fsts = C.CString(config.RuleFsts)
 	defer C.free(unsafe.Pointer(c.rule_fsts))
 
+	c.rule_fars = C.CString(config.RuleFars)
+	defer C.free(unsafe.Pointer(c.rule_fars))
+
 	c.max_num_sentences = C.int(config.MaxNumSentences)
 
 	c.model.vits.model = C.CString(config.Model.Vits.Model)

@@ -818,6 +818,7 @@ SherpaOnnxOfflineTts *SherpaOnnxCreateOfflineTts(
   tts_config.model.debug = config->model.debug;
   tts_config.model.provider = SHERPA_ONNX_OR(config->model.provider, "cpu");
   tts_config.rule_fsts = SHERPA_ONNX_OR(config->rule_fsts, "");
+  tts_config.rule_fars = SHERPA_ONNX_OR(config->rule_fars, "");
   tts_config.max_num_sentences = SHERPA_ONNX_OR(config->max_num_sentences, 2);
 
   if (tts_config.model.debug) {

@@ -783,6 +783,7 @@ SHERPA_ONNX_API typedef struct SherpaOnnxOfflineTtsConfig {
   SherpaOnnxOfflineTtsModelConfig model;
   const char *rule_fsts;
   int32_t max_num_sentences;
+  const char *rule_fars;
 } SherpaOnnxOfflineTtsConfig;
 
 SHERPA_ONNX_API typedef struct SherpaOnnxGeneratedAudio {

@@ -164,6 +164,7 @@ endif()
 
 if(SHERPA_ONNX_ENABLE_TTS)
   target_link_libraries(sherpa-onnx-core piper_phonemize)
+  target_link_libraries(sherpa-onnx-core fstfar fst)
 endif()
 
 if(SHERPA_ONNX_ENABLE_CHECK)

@@ -18,7 +18,6 @@
 #endif
 
 #include <memory>
-#include <regex>  // NOLINT
 
 #include "sherpa-onnx/csrc/macros.h"
 #include "sherpa-onnx/csrc/onnx-utils.h"
@@ -26,6 +25,55 @@
 
 namespace sherpa_onnx {
 
+static std::vector<std::string> ProcessHeteronyms(
+    const std::vector<std::string> &words) {
+  std::vector<std::string> ans;
+  ans.reserve(words.size());
+
+  int32_t num_words = static_cast<int32_t>(words.size());
+  int32_t i = 0;
+  int32_t prev = -1;
+  while (i < num_words) {
+    // start of a phrase #$|
+    if ((i + 2 < num_words) && words[i] == "#" && words[i + 1] == "$" &&
+        words[i + 2] == "|") {
+      if (prev == -1) {
+        prev = i + 3;
+      }
+      i = i + 3;
+      continue;
+    }
+
+    // end of a phrase |$#
+    if ((i + 2 < num_words) && words[i] == "|" && words[i + 1] == "$" &&
+        words[i + 2] == "#") {
+      if (prev != -1) {
+        std::ostringstream os;
+        for (int32_t k = prev; k < i; ++k) {
+          if (words[k] != "|" && words[k] != "$" && words[k] != "#") {
+            os << words[k];
+          }
+        }
+        ans.push_back(os.str());
+
+        prev = -1;
+      }
+
+      i += 3;
+      continue;
+    }
+
+    if (prev == -1) {
+      // not inside a phrase
+      ans.push_back(words[i]);
+    }
+
+    ++i;
+  }
+
+  return ans;
+}
+
 static void ToLowerCase(std::string *in_out) {
   std::transform(in_out->begin(), in_out->end(), in_out->begin(),
                  [](unsigned char c) { return std::tolower(c); });
@@ -148,36 +196,9 @@ std::vector<std::vector<int64_t>> Lexicon::ConvertTextToTokenIdsChinese(
     const std::string &_text) const {
   std::string text(_text);
   ToLowerCase(&text);
-  std::vector<std::string> words;
-  if (pattern_) {
-    // Handle polyphones
-    size_t pos = 0;
-    auto begin = std::sregex_iterator(text.begin(), text.end(), *pattern_);
-    auto end = std::sregex_iterator();
-    for (std::sregex_iterator i = begin; i != end; ++i) {
-      std::smatch match = *i;
-      if (pos < match.position()) {
-        auto this_segment = text.substr(pos, match.position() - pos);
-        auto this_segment_words = SplitUtf8(this_segment);
-        words.insert(words.end(), this_segment_words.begin(),
-                     this_segment_words.end());
-        pos = match.position() + match.length();
-      } else if (pos == match.position()) {
-        pos = match.position() + match.length();
-      }
 
-      words.push_back(match.str());
-    }
-
-    if (pos < text.size()) {
-      auto this_segment = text.substr(pos, text.size() - pos);
-      auto this_segment_words = SplitUtf8(this_segment);
-      words.insert(words.end(), this_segment_words.begin(),
-                   this_segment_words.end());
-    }
-  } else {
-    words = SplitUtf8(text);
-  }
+  std::vector<std::string> words = SplitUtf8(text);
+  words = ProcessHeteronyms(words);
 
   if (debug_) {
     fprintf(stderr, "Input text in string: %s\n", text.c_str());
@@ -357,9 +378,6 @@ void Lexicon::InitLexicon(std::istream &is) {
   std::string line;
   std::string phone;
 
-  std::ostringstream os;
-  std::string sep;
-
   while (std::getline(is, line)) {
     std::istringstream iss(line);
 
@@ -381,18 +399,9 @@ void Lexicon::InitLexicon(std::istream &is) {
     if (ids.empty()) {
       continue;
     }
-    if (language_ == Language::kChinese && word.size() > 3) {
-      // this is not a single word;
-      os << sep << word;
-      sep = "|";
-    }
 
     word2ids_.insert({std::move(word), std::move(ids)});
   }
-
-  if (!sep.empty()) {
-    pattern_ = std::make_unique<std::regex>(os.str());
-  }
 }
 
 void Lexicon::InitPunctuations(const std::string &punctuations) {

@@ -7,7 +7,6 @@
 
 #include <cstdint>
 #include <memory>
-#include <regex>  // NOLINT
 #include <string>
 #include <unordered_map>
 #include <unordered_set>
@@ -65,9 +64,6 @@ class Lexicon : public OfflineTtsFrontend {
   std::unordered_map<std::string, int32_t> token2id_;
   Language language_;
   bool debug_;
-
-  // for Chinese polyphones
-  std::unique_ptr<std::regex> pattern_;
 };
 
 }  // namespace sherpa_onnx

@@ -15,6 +15,9 @@
 #include "android/asset_manager.h"
 #include "android/asset_manager_jni.h"
 #endif
+
+#include "fst/extensions/far/far.h"
+#include "kaldifst/csrc/kaldi-fst-io.h"
 #include "kaldifst/csrc/text-normalizer.h"
 #include "sherpa-onnx/csrc/lexicon.h"
 #include "sherpa-onnx/csrc/macros.h"
@@ -46,6 +49,32 @@ class OfflineTtsVitsImpl : public OfflineTtsImpl {
         tn_list_.push_back(std::make_unique<kaldifst::TextNormalizer>(f));
       }
     }
+
+    if (!config.rule_fars.empty()) {
+      if (config.model.debug) {
+        SHERPA_ONNX_LOGE("Loading FST archives");
+      }
+      std::vector<std::string> files;
+      SplitStringToVector(config.rule_fars, ",", false, &files);
+      for (const auto &f : files) {
+        if (config.model.debug) {
+          SHERPA_ONNX_LOGE("rule far: %s", f.c_str());
+        }
+        std::unique_ptr<fst::FarReader<fst::StdArc>> reader(
+            fst::FarReader<fst::StdArc>::Open(f));
+        for (; !reader->Done(); reader->Next()) {
+          std::unique_ptr<fst::StdConstFst> r(
+              fst::CastOrConvertToConstFst(reader->GetFst()->Copy()));
+
+          tn_list_.push_back(
+              std::make_unique<kaldifst::TextNormalizer>(std::move(r)));
+        }
+      }
+
+      if (config.model.debug) {
+        SHERPA_ONNX_LOGE("FST archives loaded!");
+      }
+    }
   }
 
 #if __ANDROID_API__ >= 9

@@ -20,7 +20,14 @@ void OfflineTtsConfig::Register(ParseOptions *po) {
                "It not empty, it contains a list of rule FST filenames."
                "Multiple filenames are separated by a comma and they are "
                "applied from left to right. An example value: "
-               "rule1.fst,rule2,fst,rule3.fst");
+               "rule1.fst,rule2.fst,rule3.fst");
+
+  po->Register("tts-rule-fars", &rule_fars,
+               "It not empty, it contains a list of rule FST archive filenames."
+               "Multiple filenames are separated by a comma and they are "
+               "applied from left to right. An example value: "
+               "rule1.far,rule2.far,rule3.far. Note that an *.far can contain "
+               "multiple *.fst files");
 
   po->Register(
       "tts-max-num-sentences", &max_num_sentences,
@@ -41,6 +48,17 @@ bool OfflineTtsConfig::Validate() const {
     }
   }
 
+  if (!rule_fars.empty()) {
+    std::vector<std::string> files;
+    SplitStringToVector(rule_fars, ",", false, &files);
+    for (const auto &f : files) {
+      if (!FileExists(f)) {
+        SHERPA_ONNX_LOGE("Rule far %s does not exist. ", f.c_str());
+        return false;
+      }
+    }
+  }
+
   return model.Validate();
 }
 
@@ -50,6 +68,7 @@ std::string OfflineTtsConfig::ToString() const {
   os << "OfflineTtsConfig(";
   os << "model=" << model.ToString() << ", ";
   os << "rule_fsts=\"" << rule_fsts << "\", ";
+  os << "rule_fars=\"" << rule_fars << "\", ";
   os << "max_num_sentences=" << max_num_sentences << ")";
 
   return os.str();

@@ -29,6 +29,9 @@ struct OfflineTtsConfig {
   // If there are multiple rules, they are applied from left to right.
   std::string rule_fsts;
 
+  // If there are multiple FST archives, they are applied from left to right.
+  std::string rule_fars;
+
   // Maximum number of sentences that we process at a time.
   // This is to avoid OOM for very long input text.
   // If you set it to -1, then we process all sentences in a single batch.
@@ -36,9 +39,11 @@ struct OfflineTtsConfig {
 
   OfflineTtsConfig() = default;
   OfflineTtsConfig(const OfflineTtsModelConfig &model,
-                   const std::string &rule_fsts, int32_t max_num_sentences)
+                   const std::string &rule_fsts, const std::string &rule_fars,
+                   int32_t max_num_sentences)
       : model(model),
         rule_fsts(rule_fsts),
+        rule_fars(rule_fars),
         max_num_sentences(max_num_sentences) {}
 
   void Register(ParseOptions *po);

@@ -878,6 +878,13 @@ static OfflineTtsConfig GetOfflineTtsConfig(JNIEnv *env, jobject config) {
   ans.rule_fsts = p;
   env->ReleaseStringUTFChars(s, p);
 
+  // for ruleFars
+  fid = env->GetFieldID(cls, "ruleFars", "Ljava/lang/String;");
+  s = (jstring)env->GetObjectField(config, fid);
+  p = env->GetStringUTFChars(s, nullptr);
+  ans.rule_fars = p;
+  env->ReleaseStringUTFChars(s, p);
+
   fid = env->GetFieldID(cls, "maxNumSentences", "I");
   ans.max_num_sentences = env->GetIntField(config, fid);
 

@@ -32,11 +32,12 @@ static void PybindOfflineTtsConfig(py::module *m) {
   py::class_<PyClass>(*m, "OfflineTtsConfig")
       .def(py::init<>())
       .def(py::init<const OfflineTtsModelConfig &, const std::string &,
-                    int32_t>(),
+                    const std::string &, int32_t>(),
            py::arg("model"), py::arg("rule_fsts") = "",
-           py::arg("max_num_sentences") = 2)
+           py::arg("rule_fars") = "", py::arg("max_num_sentences") = 2)
       .def_readwrite("model", &PyClass::model)
       .def_readwrite("rule_fsts", &PyClass::rule_fsts)
+      .def_readwrite("rule_fars", &PyClass::rule_fars)
       .def_readwrite("max_num_sentences", &PyClass::max_num_sentences)
       .def("validate", &PyClass::Validate)
       .def("__str__", &PyClass::ToString);

@@ -652,12 +652,14 @@ func sherpaOnnxOfflineTtsModelConfig(
 func sherpaOnnxOfflineTtsConfig(
   model: SherpaOnnxOfflineTtsModelConfig,
   ruleFsts: String = "",
+  ruleFars: String = "",
   maxNumSenetences: Int = 2
 ) -> SherpaOnnxOfflineTtsConfig {
   return SherpaOnnxOfflineTtsConfig(
     model: model,
     rule_fsts: toCPointer(ruleFsts),
-    max_num_sentences: Int32(maxNumSenetences)
+    max_num_sentences: Int32(maxNumSenetences),
+    rule_fars: toCPointer(ruleFars)
   )
 }
 

@@ -90,7 +90,7 @@ function initSherpaOnnxOfflineTtsModelConfig(config, Module) {
 function initSherpaOnnxOfflineTtsConfig(config, Module) {
   const modelConfig =
       initSherpaOnnxOfflineTtsModelConfig(config.offlineTtsModelConfig, Module);
-  const len = modelConfig.len + 2 * 4;
+  const len = modelConfig.len + 3 * 4;
   const ptr = Module._malloc(len);
 
   let offset = 0;
@@ -98,12 +98,19 @@ function initSherpaOnnxOfflineTtsConfig(config, Module) {
   offset += modelConfig.len;
 
   const ruleFstsLen = Module.lengthBytesUTF8(config.ruleFsts) + 1;
-  const buffer = Module._malloc(ruleFstsLen);
+  const ruleFarsLen = Module.lengthBytesUTF8(config.ruleFars) + 1;
+
+  const buffer = Module._malloc(ruleFstsLen + ruleFarsLen);
   Module.stringToUTF8(config.ruleFsts, buffer, ruleFstsLen);
+  Module.stringToUTF8(config.ruleFars, buffer + ruleFstsLen, ruleFarsLen);
+
   Module.setValue(ptr + offset, buffer, 'i8*');
   offset += 4;
 
   Module.setValue(ptr + offset, config.maxNumSentences, 'i32');
+  offset += 4;
+
+  Module.setValue(ptr + offset, buffer + ruleFstsLen, 'i8*');
 
   return {
     buffer: buffer, ptr: ptr, len: len, config: modelConfig,
@@ -190,6 +197,7 @@ function createOfflineTts(Module, myConfig) {
   let offlineTtsConfig = {
     offlineTtsModelConfig: offlineTtsModelConfig,
     ruleFsts: '',
+    ruleFars: '',
     maxNumSentences: 1,
   }
 

@@ -18,7 +18,7 @@ static_assert(sizeof(SherpaOnnxOfflineTtsModelConfig) ==
                   sizeof(SherpaOnnxOfflineTtsVitsModelConfig) + 3 * 4,
               "");
 static_assert(sizeof(SherpaOnnxOfflineTtsConfig) ==
-                  sizeof(SherpaOnnxOfflineTtsModelConfig) + 2 * 4,
+                  sizeof(SherpaOnnxOfflineTtsModelConfig) + 3 * 4,
               "");
 
 void MyPrint(SherpaOnnxOfflineTtsConfig *tts_config) {
@@ -40,6 +40,7 @@ void MyPrint(SherpaOnnxOfflineTtsConfig *tts_config) {
 
   fprintf(stdout, "----------tts config----------\n");
   fprintf(stdout, "rule_fsts: %s\n", tts_config->rule_fsts);
+  fprintf(stdout, "rule_fars: %s\n", tts_config->rule_fars);
   fprintf(stdout, "max num sentences: %d\n", tts_config->max_num_sentences);
 }