============================================== Speech recognition script for Asterisk==============================================This script makes use of Google's speech recognition enginein order to render speech to text and return it back to the dialplanas an asterisk channel variable.------------Requirements------------Perl The Perl Programming Languageperl-libwww The World-Wide Web library for PerlIO-Socket-SSL Perl module that implements an interface to SSL sockets.flac Free Lossless Audio CodecInternet access in order to contact google and get the speech data.** Optional/Highly experimental **speex patent-free audio compression format designed for speech. works only with patched speex encoder that supports MIME "x-speex-with-header-byte" https://github.com/zaf/Speex-with-header-bytes------------Installation------------To install copy speech-recog.agi to your agi-bin directory.Usually this is /var/lib/asterisk/agi-bin/To make sure check your /etc/asterisk/asterisk.conf file-----Usage-----agi(speech-recog.agi,[lang],[timeout],[intkey],[NOBEEP])Records from the current channel until 2 seconds of silence are detected(this can be set by the user by the 'timeout' argument, -1 for no timeout) or theinterrupt key (# by default) is pressed. If NOBEEP is set, no beep sound is playedback to the user to indicate the start of the recording.The recorded sound is send over to googles speech recognition service and thereturned text string is assigned as the value of the channel variable 'utterance'.The scripts sets the following channel variables:status : Return status. 0 means success, non zero values indicating different errors.id : Some id string that googles engine returns, not very useful(?).utterance : The generated text string.confidence : A value between 0 and 1 indicating the probability of a correct recognition. Values bigger than 0.95 usually mean that the resulted text is correct.--------Examples--------sample dialplan code for your extensions.conf;Simple speech recognitionexten => 1234,1,Answer()exten => 1234,n,agi(speech-recog.agi,en-US)exten => 1234,n,Verbose(1,The text you just said is: ${utterance})exten => 1234,n,Verbose(1,The probability to be right is: ${confidence})exten => 1234,n,Hangup();Speech recognition demo also using googletts.agi for text to speech synthesis:exten => 1235,1,Answer()exten => 1235,n,agi(googletts.agi,"Say something in English, when done press the pound key.",en)exten => 1235,n(record),agi(speech-recog.agi,en-US)exten => 1235,n,Verbose(1,Script returned: ${status} , ${id} , ${confidence} , ${utterance});Check return status:exten => 1235,n,GotoIf($["${status}" = "0"]?success:fail);Check the probability of a successful recognition:exten => 1235,n(success),GotoIf($["${confidence}" > "0.8"]?playback:retry);Playback the textexten => 1235,n(playback),agi(googletts.agi,"The text you just said was...",en)exten => 1235,n,agi(googletts.agi,"${utterance}",en)exten => 1235,n,goto(end);Retry in case speech recognition wasn't successful:exten => 1235,n(retry),agi(googletts.agi,"Can you please repeat more clearly?",en)exten => 1235,n,goto(record)exten => 1235,n(fail),agi(googletts.agi,"Failed to get speech data.",en)exten => 1235,n(end),Hangup();Voice dialing exampleexten => 1236,1,Answer()exten => 1236,n,agi(googletts.agi,"PLease say the number you want to dial.",en)exten => 1236,n(record),agi(speech-recog.agi,en-US)exten => 1236,n,GotoIf($[$["${status}" = "0"] & $["${confidence}" > "0.8"]]?success:retry)exten => 1236,n(success),goto(${utterance},1)exten => 1236,n(retry),agi(googletts.agi,"Can you please repeat?",en)exten => 1236,n,goto(record)Under the folder wolfram you can find a sample agi script that in combination with speech-recog.agisends queries to WolframAlpha and returs the answers as a dialplan variable. See wolfram/README fordetails and dialplan examples.-------------------Supported Languages-------------------[['Afrikaans', ['af-ZA']], ['Bahasa Indonesia',['id-ID']], ['Bahasa Melayu', ['ms-MY']], ['Catal', ['ca-ES']], ['Cetina', ['cs-CZ']], ['Deutsch', ['de-DE']], ['English', ['en-AU', 'Australia'], ['en-CA', 'Canada'], ['en-IN', 'India'], ['en-NZ', 'New Zealand'], ['en-ZA', 'South Africa'], ['en-GB', 'United Kingdom'], ['en-US', 'United States']], ['Espaol', ['es-AR', 'Argentina'], ['es-BO', 'Bolivia'], ['es-CL', 'Chile'], ['es-CO', 'Colombia'], ['es-CR', 'Costa Rica'], ['es-EC', 'Ecuador'], ['es-SV', 'El Salvador'], ['es-ES', 'Espaa'], ['es-US', 'Estados Unidos'], ['es-GT', 'Guatemala'], ['es-HN', 'Honduras'], ['es-MX', 'Mxico'], ['es-NI', 'Nicaragua'], ['es-PA', 'Panam'], ['es-PY', 'Paraguay'], ['es-PE', 'Per'], ['es-PR', 'Puerto Rico'], ['es-DO', 'Repblica Dominicana'], ['es-UY', 'Uruguay'], ['es-VE', 'Venezuela']], ['Euskara', ['eu-ES']], ['Franais', ['fr-FR']], ['Galego', ['gl-ES']], ['Hrvatski', ['hr_HR']], ['IsiZulu', ['zu-ZA']], ['slenska', ['is-IS']], ['Italiano', ['it-IT', 'Italia'], ['it-CH', 'Svizzera']], ['Magyar', ['hu-HU']], ['Nederlands', ['nl-NL']], ['Norsk bokml', ['nb-NO']], ['Polski', ['pl-PL']], ['Portugus', ['pt-BR', 'Brasil'], ['pt-PT', 'Portugal']], ['Romna', ['ro-RO']], ['Slovencina', ['sk-SK']], ['Suomi', ['fi-FI']], ['Svenska', ['sv-SE']], ['Trke', ['tr-TR']], ['?????????', ['bg-BG']], ['P??????', ['ru-RU']], ['??????', ['sr-RS']], ['???', ['ko-KR']], ['??', ['cmn-Hans-CN', '??? (????)'], ['cmn-Hans-HK', '??? (??)'], ['cmn-Hant-TW', '?? (??)'], ['yue-Hant-HK', '?? (??)']], ['???', ['ja-JP']], ['Lingua latina', ['la']]];-----------------------Security Considerations-----------------------This script contacts googles' servers in order send the recorded voice data and get backthe resulted text. The script uses SSL by default to encrypt all the traffic betweenyour pbx and google servers so no 3rd party can eavesdrop your communication, but yourvoice data will be available to Google under a not yet defined policy.-------License-------The speech-recog script for asterisk is distributed under the GNU General PublicLicense v2. See COPYING for details.--------Homepage--------http://zaf.github.com/asterisk-speech-recog/