| Author |
Message |
Alex_
Guest
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 Posted:
Thu Nov 10, 2005 5:20 pm Post subject:
Voice modem question |
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Hi All
Could anybody tell me if exists a Windows software
working with a voice-capable winmodem (software or controllerless),
that could record voice from telephone line in 16bit PCM format ?
(if modem itself supports the format, of course)
I suspect, there is a problem in winmodem drivers architechture, that
make 16bit pcm recording quite unreliable...
Regards
Alex |
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Jack
Guest
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| Posted:
Thu Nov 10, 2005 11:33 pm Post subject:
Re: Voice modem question |
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I do not have any problems recording 16 bit with AOpen FM56-P (H)
Speakerphone PCI Modem using Auto Dialer Pro
software.http://www.phonedialerpro.com/
This is NOT top of the line modem, I would say it is rather at lower price
range.
Jack
"Alex_" <alexshinkin@gmail.com> wrote in message
news:1131626523.398343.216920@g43g2000cwa.googlegroups.com...
| Quote: | Hi All
Could anybody tell me if exists a Windows software
working with a voice-capable winmodem (software or controllerless),
that could record voice from telephone line in 16bit PCM format ?
(if modem itself supports the format, of course)
I suspect, there is a problem in winmodem drivers architechture, that
make 16bit pcm recording quite unreliable...
Regards
Alex
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Matthias Moetje [MVP]
Guest
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| Posted:
Fri Nov 11, 2005 12:04 am Post subject:
Re: Voice modem question |
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Alex,
| Quote: | Could anybody tell me if exists a Windows software
working with a voice-capable winmodem (software or controllerless),
that could record voice from telephone line in 16bit PCM format ?
(if modem itself supports the format, of course)
|
http://www.terasens.com/products/teravoice
There is a free version available.
AFAIK no modem supports 16 Bit PCM directly. But it is the
Unimodem TSP's wave driver, that converts all modems'
codecs to 16Bit 8 kHz Mono PCM. So, when you are using
TAPI with the Unimodem TSP you will always deal with this
audio format only. The Unimodem TSP supports the following
modem audio formats. The correct format is selected depending
on the XformID setting in the modem's inf-file:
Null transform, no conversion. 0x0000
4-bit Rockwell ADPCM 7200 Hz format. 0x0001
4-bit IMA ADPCM 4800 Hz format. 0x0002
4-bit IMA ADPCM 7200 Hz format. 0x0003
4-bit IMA ADPCM 8000 Hz format. 0x0004
Reserved. 0x0005
Reserved. 0x0006
8-bit unsigned linear PCM at 7200 Hz format. 0x0007
8-bit unsigned linear PCM at 8000 Hz format. 0x0008
4-bit Rockwell ADPCM 7200 Hz format, without fixed gain increase.
0x0009
8 bit u-law (G.711) at 8000 Hz. 0x0010
8 bit A-law (G.711) at 8000 Hz. 0x0011
If you are using AT commands to communicate with a modem
directly, then you would need to handle the apropriate audio
format yourself, but with TAPI you don't need to care.
Best regards,
Matthias Moetje
-------------------------------------
TERASENS GmbH
Augustenstraße 24
80333 Munich, GERMANY
-------------------------------------
Fon: +49 89 143370-0
Fax: +49 89 143370-22
e-mail: moetje at terasens dot com
www: www.terasens.com
-------------------------------------
"Alex_" <alexshinkin@gmail.com> wrote in message
news:1131626523.398343.216920@g43g2000cwa.googlegroups.com...
| Quote: | Hi All
Could anybody tell me if exists a Windows software
working with a voice-capable winmodem (software or controllerless),
that could record voice from telephone line in 16bit PCM format ?
(if modem itself supports the format, of course)
I suspect, there is a problem in winmodem drivers architechture, that
make 16bit pcm recording quite unreliable...
Regards
Alex
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Alex_
Guest
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| Posted:
Fri Nov 11, 2005 7:26 am Post subject:
Re: Voice modem question |
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|
Thanks for answers, I'll try that software ...
Actually I am using no TAPI nor microphone or speakerfone devices, I am
interested in getting digitized voice directly from COM-port, using
voice AT commands.
Modems that can provide 16-bit PCM are exist, you can get a list of
supported formats by typing "AT+FCLASS=8;+VSM=?" in any terminal
program .
As I understand , it is impossible to get 16bit encoding from modem
using TAPI, right ?
Well, it seems that AOpen modem is based on Rockwell/Conexant chipset.
Looks like they have written good drivers ;)
I have experimented with modems, based on intel 536ep and lucent/agere
1648 (Mars 3) chipsets. The modems can provide 16-bit PCM stream but
lose bytes under heavy I/O load (copying files on USB or network
drive).
Regards
Alex |
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Matthias Moetje [MVP]
Guest
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| Posted:
Sat Nov 12, 2005 12:24 am Post subject:
Re: Voice modem question |
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Alex,
| Quote: | As I understand , it is impossible to get 16bit encoding from modem
using TAPI, right ?
..Unimodem TSP's wave driver, that converts all modems'
codecs to 16Bit 8 kHz Mono PCM....
|
Best regards,
Matthias Moetje
-------------------------------------
TERASENS GmbH
Augustenstraße 24
80333 Munich, GERMANY
-------------------------------------
Fon: +49 89 143370-0
Fax: +49 89 143370-22
e-mail: moetje at terasens dot com
www: www.terasens.com
------------------------------------- |
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