Re: News from the Full-Duplex front

Alex,

> Full-duplex speakerphone is also an old feature....

Yes, I stated this:

> - it does offer "full-duplex speakerphone" support. This
> is nothing special normally. ...

The new thing is that there is an internal (not physical but
software connection) between modem and soundcard.

Best regards,

Matthias Moetje
-------------------------------------
TERASENS GmbH
Ackermannstraße 3
80797 München
-------------------------------------
Fon: +49 89 143370-0
Fax: +49 89 143370-22
e-mail: moetje at terasens dot de
www: www.terasens.de
-------------------------------------


> ---
> Visit http://www.opennetcf.org
> "Matthias Moetje" <moetje@xxxxxxxxxxxxxxxxxxx> wrote in message
> news:exww1wOnFHA.3288@xxxxxxxxxxxxxxxxxxxxxxx
> > Dear Readers,
> >
> > I finally found some time to test the PCTel modem we
> > recently acquired and here are my findings:
> >
> > - of course (like any other modem) it does not support
> > full-duplex line record and playback
> >
> > - it does offer "full-duplex speakerphone" support. This
> > is nothing special normally. Many modems offer this
> > capability. "Full duplex speakerphone" normall means
> > that you can connect a speaker and a microphone to
> > the jacks on the modem. By calling phoneSetHookswitch
> > you can activate the speaker and mic (like pressing the
> > speaker button on telephones)
> >
> > - What is special about the PCTel modem now is that it
> > does not have any mic and phone jacks. Instead it uses
> > the computers soundcard as speakerphone. When you
> > call phoneSetHookswitch you can talk interactively with
> > the remote party using your speaker and microphone
> > in absolute full-duplex mode
> >
> > - This is why it installs the Unimodem Full-Duplex audio
> > device. I guess now this is the solution to the question we
> > often wondered about here: Why there is a full-duplex audio
> > device and a half duplex one. So, we might draw the
> > conclusion that modems that install the full-duplex audio
> > device are capable of this functionality.
> > (Please note though, that only _2_ modems of all modem
> > drivers shipped with Windows actually use the Full Duplex
> > device)
> >
> > - So what is the benefit besides from being able to talk
> > interactively (this is not a real improvement because the
> > only difference to other modems is that you put your headset
> > into the soundcard instead of the modem itself!)?
> >
> >
> > I have tried to record from the soundcard audio device:
> >
> > This does not seem to be possible while speakerphone mode
> > is active, it says that the audio format is not supported but I
> > rather guess that the device is occupied (maybe more test
> > need to be done)
> >
> > Even if this would work: Ususally the recording mixer is set to
> > record from the microphone. Though, when I want to playback
> > audio to the phone line I would need to set the recording to
> > "Stereo Mix". This indeed works and you can hear audio on
> > the remote side but: Since "Stereo Mix" is the mix where incoming
> > audio is present too, thus this creates a nice little software
> > feedback. So far I can see no resolution here. (maybe creating
> > your own audio and mixer driver)
> >
> >
> > Best regards,
> >
> > Matthias Moetje
> > -------------------------------------
> > TERASENS GmbH
> > Ackermannstraße 3
> > 80797 München
> > -------------------------------------
> > Fon: +49 89 143370-0
> > Fax: +49 89 143370-22
> > e-mail: moetje at terasens dot de
> > www: www.terasens.de
> > -------------------------------------
> >
> >
>


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