home *** CD-ROM | disk | FTP | other *** search
- Newsgroups: rec.audio
- Path: sparky!uunet!usc!sdd.hp.com!col.hp.com!news.dtc.hp.com!hpscit.sc.hp.com!cupnews0.cup.hp.com!news1.boi.hp.com!hp-pcd!hpcvaac!billn
- From: billn@hpcvaac.cv.hp.com (bill nelson)
- Subject: Re: CD Sound Quality
- Message-ID: <1992Dec26.072221.1912@hpcvaac.cv.hp.com>
- Organization: Hewlett-Packard Company, Corvallis, Oregon USA
- References: <7490273@hpfcso.FC.HP.COM>
- Date: Sat, 26 Dec 1992 07:22:21 GMT
- Lines: 19
-
- myers@hpfcso.FC.HP.COM (Bob Myers) writes:
- : > Say you sample at 44 KHz. The maximum theoretical limit of frequency
- : > you can capture is half of this, 22 KHz. However, at this rate there
- : > are only two samples per cycle. With two samples per cycle, a sine
- : > wave will sound the same as a square wave. Surely this is not hi-fi?
- : > Suppose you say that you cannot hear this high a frequency.
- : > Well, at 11 KHz, there will be 4 samples per waveform. How close
- : > to a pure sine wave can you get with 4 samples? By looking at it,
- : > not very. I'm not sure how noticable the difference in the sound is.
- : > I guess it wouldn't be difficult for someone with a computer with
- : > reasonable sound capabilities to try this out.
- :
- : God, not this again. Here, let me introduce you to my good friend,
- : Mr. Fourier, and his friends, Mr. Shannon and Mr. Nyquist.....
-
- He probably believes that the lathe cutter cuts a square wave into
- the vinyl on the analog disc.
-
- Bill
-