sound output levels

[ralph lindberg]

Bacground:

I've writen a VI that outputs specific tonal pulses from a standard PC sound card.

I used the sound.vi as NI volume control library as a basis

Since we will be using this application on a variety of PC's, I need to know something about their output levels.

I don't need "lab" quallity standards, just consistancy of about 1 dBV

does anyone know if the "standard" sound cards put out roughly the same drive levesl?

[Coq_Rouge]

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ralph lindberg wrote:

Bacground:

I've writen a VI that outputs specific tonal pulses from a standard PC sound card.

I used the sound.vi as NI volume control library as a basis

Since we will be using this application on a variety of PC's, I need to know something about their output levels.

I don't need "lab" quallity standards, just consistancy of about 1 dBV

does anyone know if the "standard" sound cards put out roughly the same drive levesl?

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Just to be sure. What do mean then you are saying 1 dBV. 1 dBV is equal to 3.1735 VPP. This is perhaps to high for some sound card. I think the typical sound card output level is 2 VPP

[ralph lindberg]

I could have been more clear

I am currently ouputing at a -5dBV, I would like to know that if any/most/some cards put-out a similar level, to 1dBV, ie -4 dBV to -6 dBV

[Coq_Rouge]

I would guess so. But the problem are how to control the output mixer master volume via labview. I know how to do it XP but not in Vista or newer. Sound cards are also difficult to use on a general basis. There are large differences from brand to brand.