DVD-Audiobahn

RE: I can't tell if you are serious or not

86.120.170.131

In Reply to: RE: I can't tell if you are serious or not posted by BKWells on January 06, 2008 at 13:56:17

1. Yes, a musical performance is a bandlimited signal. And even if it wasn't the microphones used to capture the musical performance are bandlimited.
2. If a musical performance is bandlimited measurements can be made to see what is the highest frequency captured by the mic and select the appropriate sampling frequency (that is if you want to capture all and not use some filters before the A/D conversion). For 40 kHz of audio bandwidth a sampling rate of 88.2 or 96 already contains ALL the info of the analog signal, choosing 192k won't improve anything.
From Lavry's paper:
"So if going as fast as say 88.2 or 96KHz is already faster than the optimal rate, how can we explain the need for 192KHz sampling? Some tried to present it as a benefit due to narrower impulse response: implying either "better ability to locate a sonic impulse in space" or "a more analog like behavior". Such claims show a complete lack of understanding of signal theory fundamentals. We talk about bandwidth when addressing frequency content. We talk about impulse response when dealing with the time domain. Yet they are one of the same. An argument in favor of microsecond impulse is an argument for a Mega Hertz audio system. There is no need for such a system. The most exceptional human ear is far from being able to respond to frequencies above 40K. That is the reason musical instruments, microphones and speakers are design to accommodate realistic audio bandwidth, not Mega Hertz bandwidth."
Also, this is not about CD bitrate vs higher bitrate. No one argues that the differences between 16/44.1 and 24/96 or 24/192 are perceivable. We talk about 24 bit audio files with different sample rates. 192k sample rate is needed only if someone wants to record frequencies beyond 48 kHz (why would anyone want that or what instrument produces such high frequencies?).
An interesting interactive chart with the frequency ranges of different instruments:

http://www.independentrecording.net/irn/resources/freqchart/main_display.htm (Open in New Window)

Edits: 01/06/08 01/06/08 01/06/08 01/06/08

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