[asterisk-bugs] [JIRA] Commented: (ASTERISK-19610) dsp.c can no longer detect a quick DTMF sequence

[Jean-Philippe Lord (JIRA)]

    [ https://issues.asterisk.org/jira/browse/ASTERISK-19610?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=195830#comment-195830 ] 

Jean-Philippe Lord commented on ASTERISK-19610:
-----------------------------------------------

Tested again with:
/* How many successive hits needed to consider begin of a digit */
#define DTMF_HITS_TO_BEGIN      4
/* How many successive misses needed to consider end of a digit */
#define DTMF_MISSES_TO_END      3


Does not work. The attached WAV file is not decoded and digits are missed. 
Also tested with the alarm panel and same issue.

I went back to DTMF_HITS_TO_BEGIN 3 and DTMF_MISSES_TO_END 3 and the recognition is accurate again.


> dsp.c can no longer detect a quick DTMF sequence
> ------------------------------------------------
>
>                 Key: ASTERISK-19610
>                 URL: https://issues.asterisk.org/jira/browse/ASTERISK-19610
>             Project: Asterisk
>          Issue Type: Bug
>      Security Level: None
>          Components: Core/Channels
>    Affects Versions: 1.8.10.1, 1.8.11.0, 10.2.1, 10.3.0
>            Reporter: Jean-Philippe Lord
>              Labels: Regression
>         Attachments: 1332984810-SIP-2299-00000018-in.wav, dsp_fastdtmf.patch
>
>
> dsp.c stopped being able to decode a quick DTMF sequence starting in 1.8.10rc1. 50ms tone, 50ms silence does not work anymore. This isssue is major since asterisk used to be extremely good at detecting fast DTMF and it no longer is. I have removed the below change and issue got resolved. 
> From the ChangeLog:
> 2012-01-05 21:46 +0000 [r349672-349728]  Jonathan Rose <jrose at digium.com>
>         * main/dsp.c: Fix an issue where dsp.c would interpret multiple
>           dtmf events from a single key press. When receiving calls from a
>           mobile phone into a DISA system on a connection with significant
>           interference, the reporter's Asterisk system would interpret DTMF
>           incorrectly and replicate digits received. This patch resolves
>           that by increasing the number of frames a mismatch has to be
>           detected before assuming the DTMF is over by 1 frame and adjusts
>           dtmf_detect function to reset hits and misses only when an edge
>           is detected. (closes issue ASTERISK-17493) Reported by: Alec
>           Davis Patches: bug18904-refactor.diff.txt uploaded by Alec Davis
>           (license 5546) Review: https://reviewboard.asterisk.org/r/1130/

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