On Tuesday 04 April 2006 14:40, André Pouliot wrote: > Timothy Miller wrote: > >On 4/3/06, Justin Findlay <[EMAIL PROTECTED]> wrote: > >>I'd say more than 24, perhaps 32 bits per channel. > > > >Ok. I thought about saying 32, but I didn't want to look absurd. :) > > Sorry to tell you but using 16 bit 44,1KHz sampling most person can tell > the difference you are already at twice the nyquist frequency for what > the ear can listen. It's a base line of sort. To give you an idea > cellphone are using a 8bit 8Khz sampling rate, it's suffisant for voice. > 16 bit 96Khz more than 4 time the maximum earing frequency the high > frequency start to be more defined. Finally high-end audio at 24-bit and > 192Khz, the 24 bit allow you to listen to noise in signal and record > it(aproximatly 0,6nV for a signal 1V p-p). 192Khz your at a factor 10 of > the earing range, multiple point for each sine wave even for 20Khz that > only young kid can ear and not all of them. More than anyone could > really detect. If someone tell you he can see a difference at that > resolution it's more in is head than anything. Going to 32 bit would > more be a waste of bit and would increase the cost of the codec for > pratically no return. > > For a card in recording studio 24-bit 192KHz is more than enough. Also > for that range there already program who exist. So no need to write or > push a new aplication for only one card.
The main reason that recordings are now in the 96kHz to 192kHz range is the effects of the low pass filter before the ADC is mainly confined to the frequencies beyond human hearing. It is possible to hear the artifacts of a 44.1kHz or 48kHz low pass against a 192kHz low pass if you have really good equipment. Personally I don't think it makes much difference but the studio market and audiophile market can be very pretentious. Even the best ADCs will only give you between 19 and 20 bit precision because at those kinds of levels the thermal noise from the analog circuitry is greater than the induced noise in the ADC itself. So 24-bit 192kHz is definitely more than enough to cater for everyone involved. Paul Mullen. > > My two cents _______________________________________________ Open-graphics mailing list [email protected] http://lists.duskglow.com/mailman/listinfo/open-graphics List service provided by Duskglow Consulting, LLC (www.duskglow.com)
