Sound cards

[Tom]

There is a problem in Labview that you cannot read and write to the
sound card in the same program. If you do this the input and output
signals become mixed together. ie you cannot isolate the output
independantly from the input. I read somewhere that you need to install
a second sound card. Has anybody ever done this in LabVIEW? Even
installing two working sound cards sounds daunting.

Tom

[alipio]

Hello Tom
Well, Probably you can do what you want with only one card.
Open the "windows mixer", "sound control" or whatever is call in your computer. In "record options" select, lets say, "line input". In "playback options" check "line input" to be "silent". This should avoid your input signal to be heard, and mixed with your generated signal

Bear in mind that there are different sound cards an sometimes, mixers an options are not the same, so try combinations until you can get your goal.

Hpe this helps.

[Oleg]

Hi,
If you have full duplex card you can do it. I performed sound input and output at the same time with single card and it worked fine.
Be careful with windows volume control mixer.

Good luck.

Oleg Chutko.

[Tom]

alipio wrote in message news:<506500000005000000CD2C0100-1042324653000@exchange.ni.com>...
> Hello Tom
> Well, Probably you can do what you want with only one card.
> Open the "windows mixer", "sound control" or whatever is call in your
> computer. In "record options" select, lets say, "line input". In
> "playback options" check "line input" to be "silent". This should
> avoid your input signal to be heard, and mixed with your generated
> signal
>
> Bear in mind that there are different sound cards an sometimes, mixers
> an options are not the same, so try combinations until you can get
> your goal.
>
> Hpe this helps.

Thanks but muting the line input then means I have an output but no
input as it cuts off the input altogether.


Tom

[Michele Giordano]

In data Tue, 14 Oct 2003 17:07:02 +1300, Tom ha
scritto:

> There is a problem in Labview that you cannot read and write to the
> sound card in the same program.

When you say "write to the sound card" you say write only *.wav files or
also real time generated waves? In other words: can I "play" directly a
sine function with a sound card?
Thank you.

Michele Giordano