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Operating Systems OS X (Apple) A Bash Audio Sweep Generator... Post 302912350 by Corona688 on Thursday 7th of August 2014 12:28:05 PM
Old 08-07-2014
He has raw header values to make a WAV file of 8KHz 8-bit audio, which happens to be the format /dev/dsp uses if not told otherwise. If you used any other format than 8-bit 8khz, you'd either hear it too fast, scrambled, or pure noise.

You probably hear a tiny scratch of noise as-is when it starts, that would be the WAV header.

I believe he makes the sweep by making a small-as-possible pulse and appending it to the wav file... A bit more dead space is added to the pulse before appending it again. This moves the pulses gradually further and further apart.
 

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oggdec(1)							   Vorbis Tools 							 oggdec(1)

NAME
oggdec - simple decoder, Ogg Vorbis file to PCM audio file (WAV or RAW). SYNOPSIS
oggdec [ -Qhv ] [ -b bits_per_sample ] [ -e endianness ] [ -R ] [ -s signedness ] [ -o outputfile ] file ... DESCRIPTION
oggdec decodes Ogg Vorbis files into PCM-encoded ("uncompressed") audio files, either WAV or RAW format. For each input file, oggdec writes to a filename based on the input filename, but with the extension changed to ".wav" or ".raw" as appro- priate. If the input file is specified as - , then oggdec will read from stdin, and write to stdout unless an output filename is specified. Like- wise, an output filename of - will cause output to be to stdout. Writing WAV format to stdout is a bad idea. WAV requires a seekable medium for the header to be rewritten after all the data is written out; stdout is not seekable. OPTIONS
-Q, --quiet Suppresses program output. -h, --help Print help message. -v, --version Display version information. -b n, --bits=n Bits per sample. Valid values are 8 or 16. -e n, --endian=n Set endianness for 16-bit output. 0 (default) is little-endian (Intel byte order). 1 is big-endian (sane byte order). -R, --raw Output in raw format. If not specified, writes WAV file (RIFF headers). -s n, --sign=n Set signedness for output. 0 for unsigned, 1 (default) for signed. -o filename, --output=filename Write output to specified filename. This option is only valid if one input [file] is specified. EXAMPLES
Decode a file enabler.ogg to enabler.wav as little-endian unsigned 16-bit (default options): oggdec enabler.ogg Decode a file enabler.ogg to enabler.raw as headerless little-endian unsigned 16-bit: oggdec --raw=1 enabler.ogg Decode enabler.ogg to enabler.crazymonkey as unsigned 8-bit: oggdec -b 8 -s 0 -o enabler.crazymonkey enabler.ogg Decode enabler.ogg to enabler.raw as big-endian signed 16-bit (any of the following): oggdec -R -e 1 -b 16 enabler.ogg oggdec -R -e 1 -b 16 -o enabler.raw - < enabler.ogg oggdec -R -e 1 -b 16 - < enabler.ogg > enabler.raw Mass decoding (foo.ogg to foo.wav, bar.ogg to bar.wav, quux.ogg to quux.wav, etc.): oggdec *.ogg SEE ALSO
ogg123(1) AUTHORS
Program Authors Michael Smith <msmith@xiph.org> Manpage Authors Frederick Lee <phaethon@linux.ucla.edu>, assisted by a few million monkeys armed with keyboards in irc://irc.openprojects.net/#vorbis 2002 July 03 oggdec(1)
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