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HTS Engine

The HTS Engine is software to synthesize speech waveform from HMMs trained by the HMM-based speech synthesis system (HTS).
This page describes, how to set up necessary HTS engine for demonstation needs on 64-bit Ubuntu 16.04 workstation.

Setup steps

Ubuntu packages

  1. Set up necessary packages:

    sudo apt-get install gcc make aplay

hts_engine API

  1. Open download hts_engine API source code:

  2. Extract package:

    tar xvf hts_engine_API-1.10.tar.gz
  3. Compile it:

    cd hts_engine_API-1.10
    cd ..


  1. Open download hts_engine API source code:

  2. Extract package:

    tar xvf flite+hts_engine-1.07.tar.gz
  3. Compile it:

    cd flite+hts_engine-1.07
    cd ..

CMU_ARCTIC English voice

  1. Download voice package:

  2. Extract voice data:

    tar xvf hts_voice_cmu_us_arctic_slt-1.06.tar.gz

Bash test script

  1. Create file with following content:


    # NOTE: flite+hts_engine only reads the FIRST line of a text file.
    # So, to speak a multi-line text, we must read that text file
    # one line at a test into another file ( such as ./.line.txt),
    # and then repeatedly call flite+hts_engine
    # to read (each new line) in ./.line.txt

    # First, always flush the FIFO buffer
    dd if=./.FIFO.wav iflag=nonblock of=/dev/null >/dev/null 2>&1

    # Define linebreak as delimiter for items
    # read input line by line
    while read -r line
      if [[ -n $line ]]; then
        for sentence in $(echo $line|sed 's/\. \([[:upper:]]\)/.\n\1/g'); do
          echo "$sentence" > ./.line.txt
          #   Here are relevant flite_hts_engine options explained:
          #   -m  : the location of the voice; you must have this option
          #   -s  : the sound sample rate in Hz (48000 should work; or 44100)
          #   -r  : speech speed rate (0.5=half speed, 1.0 is default, 2.0=twice speed)
          #   -fm : raise the pitch with "1", "2.3", or lower it with "-1" "-2", etc.
          #   -o  : the output; this must be a .wav filename
          #   the input must be a text file

          # And this is how you call flite_hts_engine (reading .line.txt):
          ./flite+hts_engine-1.07/bin/flite_hts_engine \
          -m ./hts_voice_cmu_us_arctic_slt-1.06/cmu_us_arctic_slt.htsvoice \
          -s 44100 \
          -r 1.2 \
          -o ./.FIFO.wav \

          # Set up aplay to play when .FIFO.wav gets some sound
          # DON'T forget the '&' at the end of the line!
          aplay -q ./.FIFO.wav &

          # IMPORTANT: call 'wait' to make sure that both aplay and flite_hts_engine are completely done before continuing
    done < "${1:-/dev/stdin}"
  2. Make file executable:

    chmod +x
  3. Test engine by executing file:


    and enter text.
    Press Ctrl+c (or Ctrl+d) to finish script.

  4. can take one parameter where you can pass text file as an input for it e.g.: test.txt

    will read text from test.txt file.

Tags Valoda English
Created by Valdis Vītoliņš on 2018-01-10 14:05
Last modified by Valdis Vītoliņš on 2021-05-09 15:33
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