[asterisk-bugs] [Asterisk 0016017]: v23 caller id detection (UK) less than 100%

[Asterisk Bug Tracker]

A NOTE has been added to this issue. 
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https://issues.asterisk.org/view.php?id=16017 
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Reported By:                troublebot
Assigned To:                
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Project:                    Asterisk
Issue ID:                   16017
Category:                   Functions/func_callerid
Reproducibility:            sometimes
Severity:                   minor
Priority:                   normal
Status:                     new
Asterisk Version:           1.4.26.2 
JIRA:                        
Regression:                 No 
SVN Branch (only for SVN checkouts, not tarball releases): N/A 
SVN Revision (number only!):  
Request Review:              
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Date Submitted:             2009-10-05 06:48 CDT
Last Modified:              2009-10-05 06:53 CDT
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Summary:                    v23 caller id detection (UK) less than 100%
Description: 
Around 1 in 100 will fail with callerid.c: No start bit found in fsk data

After implementation of polarity detection in wcfxo.c I initially believed
there was an issue with my implementation or the hardware (X100P SE). I
setup enhanced logging and data capture and discovered that this was not
the case. There is a certain amount of noise present most of which could be
removed with a band pass filter, which I believe should help detection
rates. I do not believe the noise is inherent in the line, most of the
noise can be characterised as low frequency noise (mentioned in si3034 spec
as dc offset) and 4khz squeal. I have the raw data captured directly from
wcfxo if there is any interest in improving this. 
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 (0111838) troublebot (reporter) - 2009-10-05 06:53
 https://issues.asterisk.org/view.php?id=16017#c111838 
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I have uploaded a capture of a failed detection clid66.out

from asterisk log

[Oct  4 18:27:08] ERROR[14809] callerid.c: No start bit found in fsk
data.

from sys log

Oct  4 18:27:08 asterisk **TRIPPED POLARITY DETECTION!
Oct  4 18:27:08 asterisk **SEND POLARITY EVENT
Oct  4 18:27:08 asterisk %Callno=66,
min=1228,max=1228,total=0,offset=1228,samples=5
Oct  4 18:27:08 asterisk %Callno=66,
min=1228,max=1491,total=263,offset=1359,samples=15
Oct  4 18:27:08 asterisk %Callno=66,
min=-32768,max=3443,total=36211,offset=-14663,samples=25
Oct  4 18:27:08 asterisk %Callno=66,
min=-32768,max=3977,total=36745,offset=-14396,samples=35
Oct  4 18:27:08 asterisk %Callno=66,
min=-32768,max=3977,total=36745,offset=-14396,samples=45
Oct  4 18:27:08 asterisk %Callno=66,
min=-32768,max=3977,total=36745,offset=-14396,samples=50
Oct  4 18:27:09 asterisk %Callno=66,
min=-32768,max=32767,total=65535,offset=-1,samples=550
Oct  4 18:27:09 asterisk %Callno=66,
min=-32768,max=32767,total=65535,offset=-1,samples=1050
Oct  4 18:27:10 asterisk RING!
Oct  4 18:27:26 asterisk **SQUELCHED! 

Issue History 
Date Modified    Username       Field                    Change               
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2009-10-05 06:53 troublebot     Note Added: 0111838                          
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