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Speech synthesis

From Rosetta Code
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


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


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


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

Batch File[edit]

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");

Saved as SPEAK.BAT

>SPEAK "This is an example of speech synthesis"



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")
SYS `CoUninitialize`
DEF FN_voice_create
LOCAL C%, D%, F%, I%, M%, P%, V%
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$)
SYS "MultiByteToWideChar", 0, 0, M$, -1, M%, LENM$+1
SYS !(!V%+80), V%, M%, SPF_ASYNC, 0
DEF PROC_voice_wait(V%)
SYS !(!V%+128), V%
DEF PROC_voice_free(V%)
SYS !(!V%+8), V%


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) {
if (pid == 0) {
execlp("espeak", "espeak", s, (void*)0);
waitpid(pid, &status, 0);
if (!WIFEXITED(status) || WEXITSTATUS(status) != 0)
int main()
talk("This is an example of speech synthesis.");
return 0;


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.");


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


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


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

package main
import (
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 {
d := filepath.Join(p.Dir, "dict/cmudict-IPA.txt")
dict, err := gospeech.LoadDictionary(d)
if err != nil {
phonetics := dict.TranslateToIPA(input)
synthesized := gospeech.DefaultVoice.Synthesize(phonetics)
wav.WriteFile(synthesized, "output.wav")


Mac only:

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


import System
say x = system $ "espeak " ++ show x
main = say "This is an example of speech synthesis."


This should work in most major browsers

Works with: Javascript
var utterance = new SpeechSynthesisUtterance("This is an example of speech synthesis.");

Windows only:

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


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`)


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) {
if (pid == 0) {
execlp("espeak", "espeak", s, null)
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[edit]

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

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

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

Locomotive Basic[edit]

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[edit]

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

Using Statement Speech[edit]

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

Print each word as speak[edit]

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


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


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")


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


-- demo/rosetta/Speak.exw
string text = """
Pete, I know that you are trying to get me to talk,
but I'm afraid that is something I simply cannot allow to happen.
Oops, I just spoke didn't I? That is a shame, now I have to kill you.
<rate speed="-15"><pitch absmiddle="35">Hai.<pitch absmiddle="-15">Fuh shum. Squelch. Thud."""
include pComN.ew
procedure speak(atom pVoice, string text)
{} = cominvk(pVoice,ISpVoice_Speak,{unicode_string(text),SPF_IS_XML,0})
end procedure
if platform()=WINDOWS then
atom pVoice = allocate(machine_word()),
res = CoCreateInstance(CLSID_SpVoice,IID_ISpVoice,pVoice)
if res!=S_OK then
crash("Failed to initialize SpeechAPI. (%08x)\n",res)
end if
pVoice = com_release(pVoice)
{} = system_exec(`espeak "This is an example of speech synthesis"`)
end if


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
_ _____ _ _ _ ___ __
| | |_ _| \ | | | | \ \ / /
| | | | | \| | | | |\ 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
// 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
$file_stream->Close; // Close stream
// Have $voice (Zira) announce file stream completion
$voice->Speak('File stream complete');


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


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.")


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


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.")


(formerly Perl 6)

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


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. 


Using this module to encapsulate operating system lookup

module OperatingSystem
require 'rbconfig'
def operating_system
case RbConfig::CONFIG["host_os"]
when /linux/i
when /cygwin|mswin|mingw|windows/i
when /darwin/i
when /solaris/i
def linux?; operating_system == :linux; end
def windows?; operating_system == :windows; end
def mac?; operating_system == :mac; 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
elsif OperatingSystem.mac?
IO.popen(["say"], "w") {|pipe| pipe.puts text}
# 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}
speak 'This is an example of speech synthesis.'


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")
val synth = Central.createSynthesizer(null)
val desc = synth.getEngineModeDesc match {case g2: SynthesizerModeDesc => g2}
synth.getSynthesizerProperties.setVoice(desc.getVoices.find(_.toString == VOICENAME).get)
synth.speakPlainText(text, null)
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."


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


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."]


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[edit]

Here we use the open source espeak tool:

Works with: Bourne Shell
Works with: bash
espeak "This is an example of speech synthesis."


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


For typing:

speak "This is an example of speech synthesis."

For importing:

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

ZX Spectrum Basic[edit]

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