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Popular sampling rates Some sampling rates are more popular than others, for various reasons. Some recording hardware is restricted to (approximations of) some of these rates, some playback hardware has direct support for some. The popularity of divisors of common rates can be explained by the simplicity of clock frequency dividing circuits . Samples/sec Description 5500 One fourth of the Mac sampling rate (rarely seen). 7333 One third of the Mac sampling rate (rarely seen). 8000 Exactly 8000 samples/sec is a telephony standard that goes together with U-LAW (and also A-LAW) encoding. Some systems use an slightly different rate; in particular, the NeXT workstation uses 8012.8210513, apparently the rate used by Telco CODECs. 11 k Either 11025, a quarter of the CD sampling rate, or half the Mac sampling rate (perhaps the most popular rate on the Mac). 16000 Used by, e.g. the G.722 compression standard. 18.9 k CD-ROM/XA standard. 22 k Either 22050, half the CD sampling rate, or the Mac rate; the latter is precisely 22254.545454545454 but usually misquoted as 22000. (Historical note: 22254.5454... was the horizontal scan rate of the original 128k Mac.) 32000 Used in digital radio, NICAM (Nearly Instantaneous Compandable Audio Matrix [IBA/BREMA/BBC]) and other TV work, at least in the UK; also long play DAT and Japanese HDTV. 37.8 k CD-ROM/XA standard for higher quality. 44056 This weird rate is used by professional audio equipment to fit an integral number of samples in a video frame. 44100 The CD sampling rate. (DAT players recording digitally from CD also use this rate.) 48000 The DAT (Digital Audio Tape) sampling rate for domestic use. |
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