Intel 536ep based modem problem in Win2k/WinXP

  • Thread starter Thread starter Alex_
  • Start date Start date
A

Alex_

Hi, All !

My application records voice from telephone line using Intel 536ep
based modem in voice mode. The modem is "controllerless", it has DSP
and analog front end chip. OS - Win2k/WinXP.
I've got a problem using 16bit PCM compression
mode(AT+VSM=1,11025,0,0).
When PC performing I/O-intensive operations,like copying a big file on
USB flash, I've got lost bytes in recorded data flow. It's very easy to
hear that one byte is lost when using 16 bit PCM ;) ... I got a piece
of noice until another byte is lost ...
I am playing with DCB settings and flow control but with no success for
now .
I havent noticed such effect using modem based on Conexant 11252 chip,
but 16bit/11025Hz mode is essential for my task ,so I would like to use
the Intel chip.

Could anyone help to solve the problem?
 
Unfortunately in WinXP one driver can cause starvation of other
drivers. Try to avoid other activity while recording voice.
(exactly same advice as for burning a CD. Don't do anything else or you can get a coaster).
Maybe a muliprocessor or HT machine can help.

--PA
 
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