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On 31 Dec 2004 16:09:12 GMT, B&D wrote:
On 12/30/04 11:17 AM, in article , "Stewart Pinkerton" wrote: It is not the same for all records and all TT rigs. That was my point. But it is *never* lower than 60-65dB below peak level on other than direct-cut LPs, which is the *real* point. Since I think I recall that you said that the human ear has difficulty discerning distortion 40dB down - this would place it near the threshhold of human hearing, especially if played at sane volumes? While the music is playing at peak level, yes - that kind of masking effect is the basis of codecs such as Dolby Digital and MP3. However, when the music is playing more quietly, the sensitivity of the ear adjusts, and surface noise is often less than 20dB below the average signal level, even without rests and fadeouts. With CD made from digital master tapes the noise floor can remain at least 40dB below the quiet musical passages - given good microphone technique. -- Stewart Pinkerton | Music is Art - Audio is Engineering |
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