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2003 May 20 23:13

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[OT] Re: [vox-tech] recording telephone speech using dialogic
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[OT] Re: [vox-tech] recording telephone speech using dialogic

On Tue, 20 May 2003, joel pinto wrote:

> I am using Intel Dialogic card to record telephone
> speech. i am running it on windows.

There's your problem. ;)

> The speech data collected has a peculiar problem.
> Wheneve there is no speech ( silence after the
> utterance ), there seems to be a DC value to it. ( ie
> no zero crossings => totally above/below the zero
> axis).
> I am wondering whether it is bcos of the AGC (
> automatic gain control) in the Dialogic OR is it a
> problem with the sound card.
> the extreme case of the actual signal from telephone
> line having DC is ruled out bcos this is observed only
> in silence after the utterance.

Maybe you are feeding a current output into a capacitively-coupled voltage
input.  If so, you probably need to add some load (resistor to ground)
comparable to the impedance of the normal load for that output (speaker?).

Jeff Newmiller                        The     .....       .....  Go Live...
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