[Asterisk-Users] RxFAX generates no tiff file

[Steve Underwood]

HI Troy,

There are frame slips in your audio stream. That is why things go wrong. 
The QAM modulation used for most of the faster modems (including the FAX 
modems) cannot tolerate even a single audio sample dropped from the 
stream - it represents a huge phase shift :-\

Are you using a T1 oe E1? If so, check your clock source. The commonest 
reason for sample slips is that you are not synching to the network.

Regards,
Steve


Troy Settle wrote:

>Running spandsp 0.0.1k, tiff 3.5.7.
>
>I put some audio log files in the same directory.
>
>Thanks,
>
>--
>  Troy Settle
>  Pulaski Networks
>  http://www.psknet.com
>  866.477.5638
> 
>
>  
>
>>-----Original Message-----
>>From: asterisk-users-admin at lists.digium.com 
>>[mailto:asterisk-users-admin at lists.digium.com] On Behalf Of 
>>Steve Underwood
>>Sent: Saturday, May 22, 2004 10:27 PM
>>To: asterisk-users at lists.digium.com
>>Subject: Re: [Asterisk-Users] RxFAX generates no tiff file
>>
>>Hi Troy,
>>
>>People had a lot of problems like this with earlier versions 
>>of spandsp. 
>>However, the latest version is pretty solid, and people are 
>>using it in 
>>high volume production applications. If you are getting these bad 
>>results with the latest version I would be interested to see 
>>the audio 
>>log file, so I can investigate the reason.
>>
>>Regards,
>>Steve
>>
>>
>>Troy Settle wrote:
>>
>>    
>>
>>>Dunno about not being able to generate a tiff, I got rxfax 
>>>      
>>>
>>to do that, but
>>    
>>
>>>they're badly malformed.
>>>
>>>http://roanoke-voip01.psknet.com/fax/
>>>
>>>
>>>
>>>--
>>> Troy Settle
>>> Pulaski Networks
>>> http://www.psknet.com
>>> 866.477.5638
>>> 
>>>      
>>>