[asterisk-speech-rec] Grammar Question

[Kevin Bednar]

Thanks Adam, I saw that, but I was actually asking Stephen how that 
could be done in the grammar itself. :)

Kevin

Adam Robins wrote:
> That is what the
>
> exten => s,1,Set(SPEECH_DTMF_MAXLEN=1)
>
> is for.  It will proceed after the specified maximum input length.
>
> -----Original Message-----
> From: asterisk-speech-rec-bounces at lists.digium.com [mailto:asterisk-speech-rec-bounces at lists.digium.com] On Behalf Of Kevin Bednar
> Sent: Wednesday, April 21, 2010 7:37 PM
> To: Use of speech recognition in Asterisk
> Subject: Re: [asterisk-speech-rec] Grammar Question
>
> Stephen,
>  Is there a way to have a grammar stop accepting further input and
> return immediately after X number of characters? Like using the digits
> grammar and making it return right away after 4 digits instead of
> waiting for the timeout value? Thanks.
>
> Kevin
>
> Stephen Keller wrote:
>   
>>> The speech engine does not handle DTMF, Asterisk does that.  The following code handles yes/no both verbally and DTMF:
>>>
>>>       
>> Actually, a better way to do this is to just build your grammar such that it returns a number, that way you can handle both cases with the same logic in the dialplan.
>>
>> So let's say you used the following yes/no grammar:
>>
>> root $yesno;
>> $yesno = ($yes | $no) {out=rules.latest()};
>> $yes = (yes [please] | yeah | yup) {out="1"};
>> $no = (no [thanks] | nope) {out="2"};
>>
>> Assuming your prompt says "Say 'yes' or press 1, or say 'no' and press 2" then the dialplan can be:
>>
>> exten => s,1,Set(SPEECH_DTMF_MAXLEN=1)                              ; Set max # DTMF digits to accept per transaction
>> exten => s,n,SpeechCreate
>> exten => s,n,SpeechLoadGrammar(yesno,pathtoyesnogrammar)
>> exten => s,n,SpeechActivateGrammar(yesno)
>> exten => s,n,SpeechBackground(is-this-john-smith|5)                 ; Ask your question and wait 5 sec for reply
>> exten => s,n,SpeechDeactivateGrammar(yesno)
>> exten => s,n,GotoIf($["${SPEECH_TEXT(0)}" = "0"]?oper)              ; caller pressed "0" - go to Operator handler (not shown)
>> exten => s,n,GotoIf($["${SPEECH_TEXT(0)}" = "1"]?score)             ; caller pressed "1" or said "yes"
>> exten => s,n,GotoIf($["${SPEECH_TEXT(0)}" = "2"]?score)             ; caller pressed "2" or said "no"
>> exten => s,n,Goto(invalid)                                          ; unexpected response - go to retry logic (not shown)
>> exten => s,n(score),GotoIf($[${SPEECH_SCORE(0)} > 650]?proceed)     ; if speech engine was 65+% confident then accept response (not shown)
>> exten => s,n,Goto(nocomp)                                           ; confidence too low - go to "didn't understand" logic (not shown)
>>
>> Obviously both cases will work, but it can be a good idea to always get in the habit of normalizing your speech and DTMF outputs, such that you don't need to know which was used.
>>
>> Thanks,
>>
>> Stephen Keller
>> Project Manager
>> LumenVox
>> P: 1-877-977-0707 - just say, "Support"
>> P: +1-858-707-7700
>> F: +1-858-707-7072
>> support at LumenVox.com
>> www.LumenVox.com
>>
>>
>>
>>
>>     
>
>
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