mc1 trade in program

Posted by Andre Yew [IP: 208.8.104.2] on July 02, 1999 at 12:35:12
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In Reply to: mc1 trade in program posted by Jim Staszak on July 02, 1999 at 08:13:35:

Hi Jim,

The 40dBSPL figure is deceptive because it is probably a wideband measurement, ie. measured with a wide frequency range, and therefore not useful for predicting audibility. 40 dBSPL is common, but it is not unusual to go well below that, even to the limits of human audibility, in normal rooms at midrange frequencies. Louis Fielder of Dolby wrote a very interesting paper some 11 years ago advocating and showing good reason to use 20-bit resolution.

Another reason to use high resolution storage is for the future. While for most people even 16-bit-recording playback may not be fully realized today, who knows what kinds of rooms we'll have in the near future? To accurately capture and store certain acoustic instruments, you do need in excess of 20 bits. For example, an unamplified drum kit is capable of 129 dBSPL peak output. I'd like to capture that accurately today, so that when I have improved listening facilities in the future, I will be able to get closer to the real thing.

Finally, Crystal has said that one of the main reasons for having 24-bit inputs to their DACs is to avoid truncation error when accepting 24-bit signals, which is quite common if you do DSP calculations, like in a digital surround processor.

--Andre

Follow Ups:

• mc1 trade in program - Jim Staszak 15:58:55 07/02/99 (0)

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