sound card

what type of sound card will causing stereo separation imperfection? when left is playing right speaker also got sound.

Thanks!!

Answer 1

[Walter Roberson]

I do not know if it is even theoretically possible to totally eliminate crosstalk. Maybe, but I don't think it would be at all easy.

Hmmm... is there a sort of opposite of the Gray Code, that flips as many bits as possible between adjacent values?

Circuits that use optical isolation are less affected by crosstalk. Once, that is, that your signals get to the isolators. Crosstalk before then is a problem. And crosstalk in fibre optical cables is low but still exists (and is exploited in security contexts to "tap" optical cables.)

Interestingly, many of the references I find to sound cards and optical isolation, have to do with HAM radio.

Anyhow, you should assume that there will be crosstalk in any sound-card that you can afford. The question becomes how much crosstalk. If it is below (say) -70 dB, you will not be able to detect it without specialized equipment.

[Daniel Shub]

70 dB re what? If you disconnect the source channel most reasonable hifi systems will let you detect crosstalk that is 100 dB down. Adding a good quality preamp will let you detect crosstalk even further down.

Answer 2

[Daniel Shub]

Most soundcards have reasonable crosstalk attenuation. SOUND and SOUNDSC turn mono signals into stereo signals. If you only want mono playback you need to add another channel of zeros.