Speech synthesis

Speech synthesis
You are encouraged to solve this task according to the task description, using any language you may know.

Render the text       This is an example of speech synthesis      as speech.

Related task

•   using a speech engine to highlight words

11l

Translation of: Nim

os:(‘espeak 'Hello world!'’)

AmigaBASIC

text$=TRANSLATE$("This is an example of speech synthesis.")
SAY text$

AppleScript

Probably the only language where output to console is harder than output to a sound device.

say "This is an example of speech synthesis"

AutoHotkey

Works with: AutoHotkey_L

talk := ComObjCreate("sapi.spvoice")
talk.Speak("This is an example of speech synthesis.")

AutoIt

$voice = ObjCreate("SAPI.SpVoice")
$voice.Speak("This is an example of speech synthesis.")

BASIC256

say "Goodbye, World for the " + 123456 + "th time."
say "This is an example of speech synthesis."

Batch File

Sorry for cheating. This is Batch/JScript hybrid.

@set @dummy=0 /*
	::Batch File section
	@echo off
	cscript //e:jscript //nologo "%~f0" "%~1"
	exit /b
::*/
//The JScript section
var objVoice = new ActiveXObject("SAPI.SpVoice");
objVoice.speak(WScript.Arguments(0));

Output:

Saved as SPEAK.BAT

>SPEAK "This is an example of speech synthesis"

>

BBC BASIC

Works with: BBC BASIC for Windows

This calls the SAPI5 API directly, it does not need an external program.

      SPF_ASYNC = 1
      ON ERROR SYS `CoUninitialize` : PRINT 'REPORT$ : END
      ON CLOSE SYS `CoUninitialize` : QUIT
      
      SYS "LoadLibrary","OLE32.DLL" TO O%
      SYS "GetProcAddress",O%,"CoInitialize" TO `CoInitialize`
      SYS "GetProcAddress",O%,"CoUninitialize" TO `CoUninitialize`
      SYS "GetProcAddress",O%,"CoCreateInstance" TO `CoCreateInstance`
      
      SYS `CoInitialize`,0
      voice% = FN_voice_create
      PROC_voice_speak(voice%, "This is an example of speech synthesis")
      PROC_voice_wait(voice%)
      PROC_voice_free(voice%)
      SYS `CoUninitialize`
      END
      
      DEF FN_voice_create
      LOCAL C%, D%, F%, I%, M%, P%, V%
      DIM C% LOCAL 15, I% LOCAL 15
      C%!0 = &96749377 : C%!4 = &11D23391 : C%!8 = &C000E39E : C%!12 = &9673794F
      I%!0 = &6C44DF74 : I%!4 = &499272B9 : I%!8 = &99EFECA1 : I%!12 = &D422046E
      SYS `CoCreateInstance`, C%, 0, 5, I%, ^V%
      IF V%=0 ERROR 100, "SAPI5 not available"
      = V%
      
      DEF PROC_voice_speak(V%, M$)
      DIM M% LOCAL 2*LENM$+1
      SYS "MultiByteToWideChar", 0, 0, M$, -1, M%, LENM$+1
      SYS !(!V%+80), V%, M%, SPF_ASYNC, 0
      ENDPROC
      
      DEF PROC_voice_wait(V%)
      SYS !(!V%+128), V%
      ENDPROC
      
      DEF PROC_voice_free(V%)
      SYS !(!V%+8), V%
      ENDPROC

C

Following shining examples of execing external programs around here:

Library: POSIX

#include <sys/wait.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>

void talk(const char *s)
{
	pid_t pid;
	int status;

	pid = fork();
	if (pid < 0) {
		perror("fork");
		exit(1);
	}

	if (pid == 0) {
		execlp("espeak", "espeak", s, (void*)0);
		perror("espeak");
		_exit(1);
	}

	waitpid(pid, &status, 0);
	if (!WIFEXITED(status) || WEXITSTATUS(status) != 0)
		exit(1);
}

int main()
{
	talk("This is an example of speech synthesis.");
	return 0;
}

C#

You need to 'Add Reference' to the COM "Microsoft Speech Object Library" in your Preferences.

using SpeechLib;

namespace Speaking_Computer
{
  public class Program
  {
    private static void Main()
    {
      var voice = new SpVoice();
      voice.Speak("This is an example of speech synthesis.");
    }
  }
}

Clojure

Library: facts/speech-synthesis

(use 'speech-synthesis.say)
(say "This is an example of speech synthesis.")

FreeBASIC

FreeBASIC does not have a native command for them.

We are going to invoke vbscript directly

''This works on Windows. Does anyone know how it would be done in Linux? 

Sub speak(texto As String)
    Dim As String frase
    frase ="mshta vbscript:Execute(""CreateObject(""""SAPI.SpVoice"""").Speak("""""+texto+""""")(window.close)"")"
    Print texto
    Shell frase
End Sub

speak "Vamos a contar " + str(123456)
speak "This is an example of speech synthesis."
Sleep

FutureBasic

FB offers easy access to excellent quality native synthesized voices in a variety of accents and languages available on Macs as demonstrated here. For a more comprehensive demonstration of speech synthesis, see the FutureBasic Rosetta Code task solution to: [Old Laday Swallowed a Fly.]

SpeechSynthesizerRef ref
ref = fn SpeechSynthesizerWithVoice( @"com.apple.speech.synthesis.voice.daniel.premium" )
fn SpeechSynthesizerStartSpeakingString( ref, @"This is an example of speech synthesis."  )

HandleEvents

GlovePIE

if var.number=0 then
var.number=1
say("This is an example of speech synthesis.")
endif

Go

Here's a library solution, but using a library written from scratch in Go.

package main

import (
    "go/build"
    "log"
    "path/filepath"

    "github.com/unixpickle/gospeech"
    "github.com/unixpickle/wav"
)

const pkgPath = "github.com/unixpickle/gospeech"
const input = "This is an example of speech synthesis."

func main() {
    p, err := build.Import(pkgPath, ".", build.FindOnly)
    if err != nil {
        log.Fatal(err)
    }
    d := filepath.Join(p.Dir, "dict/cmudict-IPA.txt")
    dict, err := gospeech.LoadDictionary(d)
    if err != nil {
        log.Fatal(err)
    }
    phonetics := dict.TranslateToIPA(input)
    synthesized := gospeech.DefaultVoice.Synthesize(phonetics)
    wav.WriteFile(synthesized, "output.wav")
}

Groovy

Mac only:

'say "This is an example of speech synthesis."'.execute()

Haskell

import System.Process (callProcess) -- From “process” library

say text = callProcess "espeak" ["--", text]

main = say "This is an example of speech synthesis."

JavaScript

This should work in most major browsers

Works with: Javascript

var utterance = new SpeechSynthesisUtterance("This is an example of speech synthesis.");
window.speechSynthesis.speak(utterance);

Windows only:

Works with: JScript

var voice = new ActiveXObject("SAPI.SpVoice");
voice.speak("This is an example of speech synthesis.");

Julia

It seems that this and similar tasks can reduce to how the language can call an external program. Using the Julia REPL:

julia> a = "hello world"
"hello world"

julia> run(`espeak $a`)

Kotlin

Translation of: C

Works with: Ubuntu 16.04

Note that this code does not work on Windows 10.

Note also that Kotlin Native does not support the automatic translation of C function-like macros such as WIFEXITED and WEXITSTATUS.

Whilst it is often possible to wrap such macros in 'ordinary' C functions and then expose the latter to Kotlin via a .klib, it is not worth the effort here. I have therefore confined myself to simply reporting a non-zero error status.

// Kotlin Native v0.6.2

import kotlinx.cinterop.*
import platform.posix.*

fun talk(s: String) {
    val pid = fork()
    if (pid < 0) {
       perror("fork")
       exit(1)
    }
    if (pid == 0) {
       execlp("espeak", "espeak", s, null)
       perror("espeak")
       _exit(1)
    }
    memScoped {
        val status = alloc<IntVar>()
        waitpid(pid, status.ptr, 0)
        if (status.value > 0) println("Exit status was ${status.value}")
    }
}

fun main(args: Array<String>) {
    talk("This is an example of speech synthesis.")
}

Liberty BASIC

Assumes that 'espeak' is available at the path shown.

nomainwin
run "C:\Program Files\eSpeak\command_line\espeak  "; chr$( 34); "This is an example of speech synthesis."; chr$( 34)
end

Another dll has been posted to do the same job, at LB Community Wiki

Locomotive Basic

Both hardware and software-only speech synthesizers exist for the CPC. A software-only solution, Speech 1.1 by Superior Software (1986), supplies three BASIC extension commands (RSXes), "|say", "|speak", and "|pitch":

|say,"This is an example of speech synthesis."

M2000 Interpreter

For Linux, through wine, if missing Sapi5 need this: winetricks speechsdk

Using Statement Speech

Module UsingStatementSpeech {
      Volume 100
      Speech "This is an example of speech synthesis."
}
UsingStatementSpeech

Print each word as speak

Module UsingEvents {
      Declare WithEvents sp "SAPI.SpVoice"
      That$="This is an example of speech synthesis."
      EndStream=False
      Function sp_Word {
            Read New StreamNumber, StreamPosition, CharacterPosition, Length
            Rem: Print StreamNumber, StreamPosition, CharacterPosition, Length
            Print Mid$(That$, CharacterPosition+1, Length);" ";
            Refresh
      }
      Function sp_EndStream {
            Print
            Refresh
            EndStream=True
      }
      Const  SVEStartInputStream = 2
      Const  SVEEndInputStream = 4
      Const  SVEVoiceChange = 8
      Const  SVEBookmark = 16
      Const  SVEWordBoundary = 32
      Const  SVEPhoneme = 64
      Const  SVESentenceBoundary = 128
      Const  SVEViseme = 256
      Const  SVEAudioLevel = 512
      Const  SVEPrivate = 32768
      Const  SVEAllEvents = 33790
      
      Const SVSFDefault = 0&
      Const SVSFlagsAsync = 1&
      Const SVSFPurgeBeforeSpeak=2&
      
      With sp, "EventInterests", SVEWordBoundary+SVEEndInputStream
      Method sp, "Speak", That$, SVSFlagsAsync
      While Not EndStream {Wait 10}
}
UsingEvents

Mathematica /Wolfram Language

Speak["This is an example of speech synthesis."]

Nim

Using same method as Julia.

import osproc

discard execCmd("espeak 'Hello world!'")

PARI/GP

Define a function that is using espeak package from Linux.

speak(txt,opt="")=extern(concat(["espeak ",opt," \"",txt,"\""]));

Now let it speak:

speak("This is an example of speech synthesis")

A monster speech tongue-twister:

speak("The seething sea ceaseth and thus the seething sea sufficeth us.","-p10 -s100")

A foreign language "Zungenbrecher":

speak("Fischers Fritz fischt frische Fische.","-vmb/mb-de2 -s130")

Perl

use Speech::Synthesis;

($engine) = Speech::Synthesis->InstalledEngines();
($voice) = Speech::Synthesis->InstalledVoices(engine => $engine);

Speech::Synthesis
  ->new(engine => $engine, voice => $voice->{id})
  ->speak("This is an example of speech synthesis.");

Phix

Library: Phix/pGUI

Library: Phix/online

You can run this online here.

--
-- demo\rosetta\Speak.exw
-- ======================
--
with javascript_semantics
requires(6) -- WINDOWS or JS, not LINUX
requires(32) -- Windows 32 bit only, for now... 
-- (^ runs fine on a 64-bit OS, but needs a 32-bit p.exe)
requires("1.0.2")
include builtins\speak.e -- (new in 1.0.2)
constant text = "This is an example of speech synthesis"

include pGUI.e

function button_cb(Ihandle /*ih*/)
    speak(text)
    return IUP_CONTINUE
end function

IupOpen()
Ihandle btn = IupButton("Speak",Icallback("button_cb")),
        dlg = IupDialog(IupHbox({btn},"MARGIN=180x80"))
IupSetAttribute(dlg,"TITLE",text)
IupShow(dlg)
if platform()!=JS then
    IupMainLoop()
    IupClose()
end if

Note that speech synthesis has refused to operate in a browser without user activation since 2018, hence the tiny GUI with a button.
Should you for some strange reason want it on desktop/Phix without any GUI, you'd need to arrange for COM initialisation etc yourself.

PHP

Linux & Mac example uses eSpeak (eSpeak Instillation instructions included in comments). Mac also has a built in Speech synthesis system and this example allows you to optionally use that instead of eSpeak. Windows example uses built in Windows Speech API.

Works with: Mac OS & Linux OS

<?php
<?php


/*
  _      _____ _   _ _    ___   __
 | |    |_   _| \ | | |  | \ \ / /
 | |      | | |  \| | |  | |\ V / 
 | |      | | | . ` | |  | | > <  
 | |____ _| |_| |\  | |__| |/ . \ 
 |______|_____|_| \_|\____//_/ \_\                                  
*/
// Install eSpeak - Run this command in a terminal
/*
 sudo apt-get install eSpeak
*/


/*
  __  __          _____ 
 |  \/  |   /\   / ____|
 | \  / |  /  \ | |     
 | |\/| | / /\ \| |     
 | |  | |/ ____ \ |____ 
 |_|  |_/_/    \_\_____|
*/
// Mac has it's own Speech Synthesis system
// accessible via the "say" command.
// To use eSpeak on a Mac, change this variable to true.
$mac_use_espeak = false;

// To use eSpeak on a Mac you need to install
// Homebrew Package Manager & eSpeak 
// Run these commands in a terminal:
/* 

/usr/bin/ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)"

brew install espeak

*/

$voice = "espeak";
$statement = 'Hello World!';
$save_file_args = '-w HelloWorld.wav'; // eSpeak args

// Ask PHP what OS it was compiled for, 
// CAPITALIZE it and truncate to the first 3 chars.
$OS = strtoupper(substr(PHP_OS, 0, 3));

// If this is Darwin (MacOS) AND we don't want eSpeak
elseif($OS === 'DAR' && $mac_use_espeak == false) { 
    $voice = "say -v 'Victoria'";
    $save_file_args = '-o HelloWorld.wav'; // say args
}

// Say It
exec("$voice '$statement'");

// Save it to a File
exec("$voice '$statement' $save_file_args");

Works with: Windows OS

<?php

// List available SAPI voices
// 0 = Microsoft David Desktop - English (United States)
// 1 = Microsoft Zira Desktop - English (United States)
// ... If you have additional voices installed
function ListSAPIVoices(&$voice){
	foreach($voice->GetVoices as $v){
		echo $v->GetDescription . PHP_EOL;
	}
}



$filename = "DaisyBell.wav";

// https://en.wikipedia.org/wiki/Daisy_Bell#Computing_and_technology
// "In 1961, an IBM 704 at Bell Labs was programmed to sing "Daisy Bell"-
// in the earliest demonstration of computer speech synthesis."
$statement = "There is a flower within my heart, Daisy, Daisy!
Planted one day by a glancing dart,
Planted by Daisy Bell!
Whether she loves me or loves me not,
Sometimes it's hard to tell;
Yet I am longing to share the lot
Of beautiful Daisy Bell!

Daisy, Daisy,
Give me your answer, do!
I'm half crazy,
All for the love of you!
It won't be a stylish marriage,
I can't afford a carriage,
But you'll look sweet on the seat
Of a bicycle built for two!

We will go tandem as man and wife, Daisy, Daisy!
Ped'ling away down the road of life, I and my Daisy Bell!
When the road's dark we can both despise Po'leaseman and lamps as well;
There are bright lights in the dazzling eyes Of beautiful Daisy Bell!

Daisy, Daisy,
Give me your answer, do!
I'm half crazy,
All for the love of you!
It won't be a stylish marriage,
I can't afford a carriage,
But you'll look sweet on the seat
Of a bicycle built for two!

I will stand by you in wheel or woe, Daisy, Daisy!
You'll be the bell which I'll ring you know! Sweet little Daisy Bell!
You'll take the lead in each trip we take, Then if I don't do well;
I will permit you to use the brake, My beautiful Daisy Bell!";

// COM (Component Object Model) objects
// https://www.php.net/manual/en/book.com.php
$voice = new COM("SAPI.SpVoice");
$voice_file_stream = new COM("SAPI.SpVoice");
$file_stream = new COM("SAPI.SpFileStream");


// Change $voice to Zira
$voice->Voice = $voice->GetVoices()->Item(1);

// Change $voice_file_stream to David
$voice_file_stream->Voice = $voice_file_stream->GetVoices()->Item(0);

// Have voices announce themselves
//$voice->Speak($voice->Voice->GetDescription); // (Zira)
//$voice_file_stream->Speak($voice_file_stream->Voice->GetDescription); // (David)


/*
Select Stream Quality:

11kHz 8Bit Mono = 8
11kHz 8Bit Stereo = 9
11kHz 16Bit Mono = 10
11kHz 16Bit Stereo = 11
...
16kHz 8Bit Mono = 16
16kHz 8Bit Stereo = 17
16kHz 16Bit Mono = 18;
16kHz 16Bit Stereo = 19
...
32kHz 8Bit Mono = 28
32kHz 8Bit Stereo = 29
32kHz 16Bit Mono = 30
32kHz 16Bit Stereo = 31
...
*/
// Set stream quality
$file_stream->Format->Type = 17; // 16kHz 8Bit Stereo

/*
Select Speech StreamFile Mode:
Read = 0
ReadWrite = 1
Create = 2
CreateForWrite = 3
*/
$mode = 3;


// Have $voice (Zira) announce beginning file stream
$voice->Speak('Opening audio file stream');

// Output TTS to File
$file_stream->Open($filename, $mode); // Open stream and create file
$voice_file_stream->AudioOutputStream = $file_stream; // Begin streaming TTS
// Have $voice_file_stream (David) speak $statement
$voice_file_stream->Speak($statement); 
$file_stream->Close; // Close stream

// Have $voice (Zira) announce file stream completion
$voice->Speak('File stream complete');

PicoLisp

(call 'espeak "This is an example of speech synthesis.")

PowerShell

Add-Type -AssemblyName System.Speech

$anna = New-Object System.Speech.Synthesis.SpeechSynthesizer

$anna.Speak("I'm sorry Dave, I'm afraid I can't do that.")
$anna.Dispose()

Python

import pyttsx

engine = pyttsx.init()
engine.say("It was all a dream.")
engine.runAndWait()

Quackery

Mac specific.

  [ $ /
import subprocess
subprocess.run(["say",
string_from_stack()])
      / python ]      is speak ( $ --> )

$ "This is an example of speech synthesis" speak

Racket

Should work on all platforms.

#lang racket
(require racket/lazy-require)
(lazy-require [ffi/com (com-create-instance com-release com-invoke)])
(define (speak text)
  (cond [(eq? 'windows (system-type))
         (define c (com-create-instance "SAPI.SpVoice"))
         (com-invoke c "Speak" text)
         (com-release c)]
        [(ormap find-executable-path '("say" "espeak"))
         => (λ(exe) (void (system* exe text)))]
        [else (error 'speak "I'm speechless!")]))
(speak "This is an example of speech synthesis.")

Raku

(formerly Perl 6)

run 'espeak', 'This is an example of speech synthesis.';

REXX

Works with: Windowx/XP or later

Programming note:   This REXX program uses a freeware program   NIRCMD   to interface with the Microsoft Windows speech synthesizer program   SAM,   a text to speech using a male voice.   SAM can possibly be configured to use other voices with later releases of Windows.   More recent Microsoft Windows have another speech synthesizer program:   ANNA.

/*REXX program uses a command line interface to invoke Windows SAM for speech synthesis.*/
parse arg t                                      /*get the (optional) text from the C.L.*/
if t=''  then exit                               /*Nothing to say?    Then exit program.*/
dquote= '"'
rate= 1                                          /*talk:   -10 (slow)   to   10 (fast). */
                                                 /* [↓]  where the rubber meets the road*/
'NIRCMD'  "speak text"  dquote  t  dquote   rate /*NIRCMD  invokes Microsoft's Sam voice*/
                                                 /*stick a fork in it,  we're all done. */

Note:   The name of the above REXX program is   speak.rex
usage   using the command:

speak This is an example of speech synthesis. 

Ring

load "guilib.ring"

myApp = New qApp 
{
   Text = "Hello. This is an example of speech synthesis"
   voice = new QTextToSpeech(null)
   voice.Say(Text)
   
   exec()
}

Output:

"Hello. This is an example of speech synthesis"

Ring

load "guilib.ring"
load "stdlib.ring"

MyApp = New qApp {

        win1 = new qWidget() {

                setwindowtitle("Hello World")
                setGeometry(100,100,370,250)

                Text = "This is an example of speech synthesis"
                Text = split(Text," ")

                label1 = new qLabel(win1) {
                        settext("What is your name ?")
                        setGeometry(10,20,350,30)
                        setalignment(Qt_AlignHCenter)
                }

                btn1 = new qpushbutton(win1) {
                        setGeometry(10,200,100,30)
                        settext("Say Hello")
                        setclickevent("pHello()")
                }

                btn2 = new qpushbutton(win1) {
                        setGeometry(150,200,100,30)
                        settext("Close")
                        setclickevent("pClose()")
                }

                lineedit1 = new qlineedit(win1) {
                        setGeometry(10,100,350,30)
                }

                voice = new QTextToSpeech(win1) {                        
                }
                show()
        }
        exec()
}

Func pHello
        lineedit1.settext( "Hello " + lineedit1.text())
        for n = 1 to len(Text)
            voice.Say(Text[n])
            see Text[n] + nl
        next

Func pClose
        MyApp.quit()

Output:

This
is
an
example
of
speech
synthesis

Ruby

Using this module to encapsulate operating system lookup

module OperatingSystem
  require 'rbconfig'
  module_function
  def operating_system
    case RbConfig::CONFIG["host_os"]
    when /linux/i
      :linux
    when /cygwin|mswin|mingw|windows/i
      :windows
    when /darwin/i
      :mac
    when /solaris/i
      :solaris
    else
      nil
    end
  end
  def linux?;   operating_system == :linux;   end
  def windows?; operating_system == :windows; end
  def mac?;     operating_system == :mac;     end
end

Library: win32-utils

Works with: Ruby version 1.9

Uses espeak on Linux, say on Mac, and the win32 SAPI library on Windows.

load 'operating_system.rb'

def speak(text)
  if OperatingSystem.windows?
    require 'win32/sapi5'
    v = Win32::SpVoice.new
    v.Speak(text)
  elsif OperatingSystem.mac?
    IO.popen(["say"], "w") {|pipe| pipe.puts text}
  else
    # Try to run "espeak". No OperatingSystem check: "espeak" is
    # for Linux but is also an optional package for BSD.
    IO.popen(["espeak", "-stdin"], "w") {|pipe| pipe.puts text}
  end
end

speak 'This is an example of speech synthesis.'

Scala

Library: FreeTTS version 1.2

import javax.speech.Central
import javax.speech.synthesis.{Synthesizer, SynthesizerModeDesc}

object ScalaSpeaker extends App {

  def speech(text: String) = {
    if (!text.trim.isEmpty) {
      val VOICENAME = "kevin16"

      System.setProperty("freetts.voices", "com.sun.speech.freetts.en.us.cmu_us_kal.KevinVoiceDirectory")
      Central.registerEngineCentral("com.sun.speech.freetts.jsapi.FreeTTSEngineCentral")

      val synth = Central.createSynthesizer(null)
      synth.allocate()

      val desc = synth.getEngineModeDesc match {case g2: SynthesizerModeDesc => g2}

      synth.getSynthesizerProperties.setVoice(desc.getVoices.find(_.toString == VOICENAME).get)
      synth.speakPlainText(text, null)

      synth.waitEngineState(Synthesizer.QUEUE_EMPTY)
      synth.deallocate()
    }
  }

  speech( """Thinking of Holland
            |I see broad rivers
            |slowly chuntering
            |through endless lowlands,
            |rows of implausibly
            |airy poplars
            |standing like tall plumes
            |against the horizon;
            |and sunk in the unbounded
            |vastness of space
            |homesteads and boweries
            |dotted across the land,
            |copses, villages,
            |couchant towers,
            |churches and elm-trees,
            |bound in one great unity.
            |There the sky hangs low,
            |and steadily the sun
            |is smothered in a greyly
            |iridescent smirr,
            |and in every province
            |the voice of water
            |with its lapping disasters
            |is feared and hearkened.""".stripMargin)
}

Sidef

func text2speech(text, lang='en') {
    Sys.run("espeak -v #{lang} -w /dev/stdout #{text.escape} | aplay");
}
text2speech("This is an example of speech synthesis.");

Swift

OS X comes with a program called "say," that does speech.

import Foundation

let task = NSTask()
task.launchPath = "/usr/bin/say"
task.arguments = ["This is an example of speech synthesis."]
task.launch()

Tcl

This just passes the string into the Festival system:

exec festival --tts << "This is an example of speech synthesis."

Alternatively, on MacOS X, you'd use the system say program:

exec say << "This is an example of speech synthesis."

On Windows, there is a service available by COM for speech synthesis:

Library: tcom

package require tcom

set msg "This is an example of speech synthesis."
set voice [::tcom::ref createobject Sapi.SpVoice]
$voice Speak $msg 0

Putting these together into a helper procedure, we get:

proc speak {msg} {
    global tcl_platform
    if {$tcl_platform(platform) eq "windows"} {
        package require tcom
        set voice [::tcom::ref createobject Sapi.SpVoice]
        $voice Speak $msg 0
    } elseif {$tcl_platform(os) eq "Darwin"} {
        exec say << $msg
    } else {
        exec festival --tts << $msg
    }
}
speak "This is an example of speech synthesis."

UNIX Shell

Here we use the open source espeak tool:

Works with: Bourne Shell

Works with: bash

#!/bin/sh
espeak "This is an example of speech synthesis."

VBScript

Dim message, sapi
message = "This is an example of speech synthesis."
Set sapi = CreateObject("sapi.spvoice")
sapi.Speak message

Wren

The ability to call external processes such as espeak is expected to be added to Wren-cli in the next release. In the meantime, we embed the following Wren script in a minimal C host (no error checking) to complete this task.

/* Speech_synthesis.wren */

class C {
    foreign static getInput(maxSize)

    foreign static espeak(s)
}

System.write("Enter something to say (up to 100 characters) : ")
var s = C.getInput(100)
C.espeak(s)

We now embed this in the following C program, compile and run it.

/* gcc Speech_synthesis.c -o Speech_synthesis -lwren -lm */

#include <stdio.h>
#include <stdio_ext.h>
#include <stdlib.h>
#include <string.h>
#include "wren.h"

void C_getInput(WrenVM* vm) {
    int maxSize = (int)wrenGetSlotDouble(vm, 1) + 2;
    char input[maxSize];
    fgets(input, maxSize, stdin);
    __fpurge(stdin);
    input[strcspn(input, "\n")] = 0;
    wrenSetSlotString(vm, 0, (const char*)input);
}

void C_espeak(WrenVM* vm) {
    const char *arg = wrenGetSlotString(vm, 1);
    char command[strlen(arg) + 10];
    strcpy(command, "espeak \"");
    strcat(command, arg);
    strcat(command, "\"");
    system(command);
}

WrenForeignMethodFn bindForeignMethod(
    WrenVM* vm,
    const char* module,
    const char* className,
    bool isStatic,
    const char* signature) {
    if (strcmp(module, "main") == 0) {
        if (strcmp(className, "C") == 0) {
            if (isStatic && strcmp(signature, "getInput(_)") == 0) return C_getInput;
            if (isStatic && strcmp(signature, "espeak(_)") == 0) return C_espeak;
        }
    }
    return NULL;
}

static void writeFn(WrenVM* vm, const char* text) {
    printf("%s", text);
}

char *readFile(const char *fileName) {
    FILE *f = fopen(fileName, "r");
    fseek(f, 0, SEEK_END);
    long fsize = ftell(f);
    rewind(f);
    char *script = malloc(fsize + 1);
    fread(script, 1, fsize, f);
    fclose(f);
    script[fsize] = 0;
    return script;
}

int main(int argc, char **argv) {
    WrenConfiguration config;
    wrenInitConfiguration(&config);
    config.writeFn = &writeFn;
    config.bindForeignMethodFn = &bindForeignMethod;
    WrenVM* vm = wrenNewVM(&config);
    const char* module = "main";
    const char* fileName = "Speech_synthesis.wren";
    char *script = readFile(fileName);
    wrenInterpret(vm, module, script);
    wrenFreeVM(vm);
    free(script);
    return 0;
}

Zoomscript

For typing:

speak "This is an example of speech synthesis."

For importing:

¶0¶speak "This is an example of speech synthesis."

ZX Spectrum Basic

This example makes use of the Currah Speech Synthesizer peripheral device.

10 LET s$="(th)is is an exampul of sp(ee)(ch) sin(th)esis":PAUSE 1