digital audio bit depths and their use
bits |
computer formats |
common use |
4 |
.aifc |
rarely used |
8 |
all formats |
early soundcards, cheap samplers. When storage was on floppy disc, this was the standard. |
12 |
none |
found on many 1980's era digital delay units and effects pedals |
16 |
all formats |
the CD standard, and the current standard for most digital audio equipment, sound cards, and samplers. |
20 |
none |
used for many A/D converters; also for new line of 20 bit ADAT multitrack machines, and on a few soundcards. See UV22 and HDCD. |
24 |
.au, .aiff, .snd |
the new "high definition standard," found on new Pro Tools systems, new DAT machines, and on DVD-audio CDs. See UV22. |
32 |
.au, .aiff, .snd |
not used for recording; used for DSP software, both as an intermediate step when doing processes which might cause distortion under 16 bit, and for spectrum analysis. |
sampling rates and their common use
rate (khz) |
description |
7.418-8.192 |
telephone (low quality) |
11.025 |
20-5,250hz. range; lowest resolution for accurate voice transmission |
22.05 |
20-10,000 hz. range; not very good for music |
32 |
20-15,000 hz. range; used in portable DAT recorders for long, mono field recordings; formerly the broadcast FM standard. |
44.1 |
20-20,000 hz. range; the CD standard, and currently the standard for digital audio cards and most digital audio devices. |
48 / 48.3 |
20-22,000 hz. range; called the DAT standard (though most DAT machines also record at 44.1). Barely distinguishable from 44.1. |
96 |
10-44,000 hz. range; the new DVD-audio standard. Note that frequencies above 24khz. are technically inaudible. |
|