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Re: Minidisc Mic Input

Subject: Re: Minidisc Mic Input
From: Walter Knapp <>
Date: Sun, 22 Aug 2004 10:37:44 -0400
From: Dan Dugan <>

> Rich Peet, you wrote,
>>>I favor a 1 uf tantalum on the line to cut subsonic noise and think
>>>that 27uf is too high for consumer minidisc recorders. Recording one
>>>channel straight in and the second through a 1 uf tantalum capacitor
>>>showed no drop in gain above 90hz and less than 3 db above 35hz.  The
>>>channel with the capacitor had less compression above 14,000 cycles. 
>>>Consumer minidisc recorders favor low frequency sound no matter how
>>>low it is and therefore it is better to get rid of some non audible
>>>subsonic rumble.
> An interesting point, Rich. High-passing the input reduces the signal 
> level, and reducing the signal level into ATRAC reduces the need for 
> data compression.

This will only work if the signal level is not just reduced, but 
eliminated. The quiet stuff gets compressed along with everything else. 
So you would want to drop the signal by 90+ dB relative to your loudest 
signal I'd assume.

I'm also not so sure about eliminating all the low end. That, too, is 
part of the natural ambiance. Even if it's a problem to record and play 
back properly. It would actually make more sense to eliminate all the 
high end, as most don't really hear that.



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