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General Audio / Re: Where did these (obsolete!) sampling rates come from?
Last post by Porcus -5.6, 7.4, 11.1 and 22.2 kHz?Both FFmpeg and SoX got some support. The SoX documentation refers to them as:
[...]
Those sampling rates were used in Apple SoundCap ("HCOM" fourcc) files - anyone even seen one?
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Format: hcomThose sample rates do make sense, but who am I to tell whether a mid-eighties Macintosh would use 22050 or something so close that 22050 is a practical approximation. Anyway 1/2, 1/3 and 1/4 is also sensible - remember this was before .wav, so its restriction to integer was not a concern.
Description: Mac FSSD files with Huffman compression
Channels restricted to: mono
Sample-rate restricted to: 22050 11025 7350 5512.5
Reads: yes
Writes:
8-bit HCOM (8-bit precision)
Also interesting is that this could be the first lossless audio format, although it might be a stretch to call it an audio compressor if it merely let a general-purpose compressor (PackIt?) loose on files that happen to contain audio.