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In the Forum: Off Air Audio
In the Thread: How to record FM broadcasts.
Post Subject: So far the bids on digial are still on.Posted by Romy the Cat on: 11/11/2005

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 jtavan wrote:
This might be an overly-obvious suggestion, but have you checked (with an audio editor program) that you're using most of the available recording range? That is, are peaks on the signal up near the maximum level possible given your recording depth? If not, you need to adjust the input sensitivity of the ADC to match the output level of your tuner. This gain matching is critical to getting a decent recording - you're just throwing away bits if your peaks aren't NEAR digimax.

I do not know how it works on digital but I did a lot of recordings in my past to reel-to-real analog and I know that if I underused dynamic range in there then I had nothing like what I am having here. Well, probably…. If I recorded on tape with 1/20 of normal recording level  and then amplify this noise up to the point of normal volume then I might have the similar effect, only the harmonic structure of the noise that I am getting with my current digital experiment is way more ugly then the tape noise would be.  Something is very screwed going on and I am convinced that what I am getting form the ADC is not what it is capable of. If fact I do like how the unit build, operates, calibrates, and the way in which it operate very-very much. This ADC is really look like a superbly-well thought machine and I hope I would find a way to kill the noise. So far, with the nose the processor operates way beyond the normal differences between CD and LP, and it juts produce a fundamentally broken sound. I spent last night up to 3AM trying to figure out what it wrong. The ADC has 20K input impedance. I do not know the output impedance of Sansui but it should be low. Juts to eliminate this care I drove the Larvy ADC with my preamp that has 9R at output and can drive a Hoover Damn’s generator but the sound/noise was identical. I kind of not please about what I’m getting but I do not really worry at this point, as my negative experience now did not affect the conceptual experiment that I’m trying to conduct: namely: if it possible to make it good. I’ sure in a day or two I will figure out what I do wrong. Perhaps the unit is defective then it is will be replaced (warranty), so it is not big deal. It would be much worse if the ADC would perform very well BUT deliver still unacceptable result. So far the bids are still on the table…

Rgs,
Romy

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