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- Path: mtrap.cts.com!Gregory.Scribner
- Date: Thu, 25 Jan 96 17:58:57 -0800
- Newsgroups: comp.sys.amiga.misc
- Distribution: world
- Subject: Re: What NEW Amigas SHOULD have
- GateSoftware: Xenolink 1.981, XenolinkUUCP 1.1
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- From: Gregory.Scribner@mtrap.cts.com (Gregory Scribner)
- Message-ID: <Gregory.Scribner.218a@mtrap.cts.com>
- Organization: The Mouse Trap BBS
-
- DG> From: David Gentry <dgentry@vlsi4.racal.com>
- DG> DG> DG> DG> DG> DG>
- DG> StarBlazer <starblaz@postoffice.ptd.net> wrote:
- DG> >32-bit sound, why settle for 16 bit, that way we'd never have to
- DG> upgrade
- DG> >(at least unless our human ears suddenly get more sensitive)
- DG>
- DG> Time to go to school...
- DG>
- DG> Even the most sensitive of human ears can barely detect sounds above
- DG> 20khz, with most
- DG> people topping out around 18khz. But let's give everyone the benefit
- DG> of the doubt
- DG> and say 20khz for all. Using the Nyquist sampling theorem, we'd have
- DG> to sample at
- DG> twice that rate to avoid intersymbol interference (this from my
- DG> Communications
- DG> systems class in college) plus a little for overhead bringing us to a
- DG> total of
- DG> 44.1khz. This is easily covered using a 16-bit resolution.
-
- Well, I believe that what you are referring to is aliasing and not
- intersymbol interference. In order to avoid aliasing you have to sample a
- waveform at twice it s frequency or else you will not be able to define
- that waveform. Basically, you need at least two points to define a
- frequency. If you do not have at least two points , that frequency will
- be lost and may also cause distortion of you input signal. Intersymbol
- interference as far as I remember is uasually associated with the
- tranfer of a digital signal through a channel or medium and not something
- you would consider when sampling an analog waveform such as music or
- speech(I also took communications in college).
-
- Also, What does 16-bit resolution have to do with your sample rate?
-
- Greg Scribner (Gerg@tlcnet.com)
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