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From: Chris Laird <cl102@york.ac.uk>
Newsgroups: comp.sys.sinclair
Subject: .WAV file format
Date: Fri, 7 Jun 1996 15:41:30 +0100
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There is a description in a FAQ document at

ftp://ftp.cwi.nl/pub/audio/RIFF-format

which I won't reproduce here as it's quite long and doesn't mean much to me.


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From: elliott@teaching.physics.ox.ac.uk  (John Elliott)
Newsgroups: comp.sys.sinclair
Subject: Re: .WAV file format
Date: 14 Jun 1996 14:06:34 GMT
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In article <Pine.SGI.3.91.960607152847.5193A-100000@tower.york.ac.uk>, Chris Laird (cl102@york.ac.uk) wrote:
: There is a description in a FAQ document at

: ftp://ftp.cwi.nl/pub/audio/RIFF-format

: which I won't reproduce here as it's quite long and doesn't mean much to me.

Here's the listing from Born's book on file formats (on open shelves in the
Radcliffe Science Library, if anyone in Oxford's interested). .WAV is a 
subset of the RIFF format as mentioned above, and comes in "chunks":

DB = Bytes
DW = 16-bit value, little-endian
DD = 32-bit value, little-endian

Header chunk:

	DB	'RIFF'
	DD	4		;Length of "WAVE" string.
	DB	'WAVE'		;Identifies it as a .WAV file

Format chunk:

	DB	'FMT '
	DD	10h		;Length of format data
	DW	type		;Mono or stereo. Either 0=Mono, 1=Stereo
				;                    or 1=Mono, 2=Stereo
				;(Born gives both in different places)
	DW	channel numbers	;?
	DD	Sample rate, Hertz
	DD	Bytes per second
	DW	Bytes per sample	;1 for 8-bit mono
					;2 for 8-bit stereo or 16-bit mono
					;4 for 16-bit stereo
	DW	Bits per sample

Data chunk:
	
	DB	'data'
	DD	length of data
	DB	data. In a stereo file, samples are arranged L,R,L,R...

According to Born, there are usually just the three chunks, but there may
be more data. It is not clear whether he means:

Header, format, data, format, data, format, data, ...      or
Header, format, data, data, data, ...

--

Apologies for the long sig, btw, but this sort of thing does happen when 
wizards get hit by magic bolts...







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---------------------------          Simon Magus is the winner
John Elliott              |    (O)                              _o  \|/
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---------------------------    ((O))               _(())         A  .|.


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From: thdb86%teach@dcs.shef.ac.uk (Damion Yates)
Newsgroups: comp.sys.amstrad.8bit,comp.sys.sinclair,comp.sys.acorn.programmer
Subject: Re: AY-3-819x PSG noise
Followup-To: comp.sys.amstrad.8bit,comp.sys.sinclair,comp.sys.acorn.programmer
Date: 3 Jun 1996 16:23:16 GMT
Organization: Department of Computer Science, University of Sheffield
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M.G. Rison (mgr11@cus.cam.ac.uk) wrote:
: [Note cross-post]

: Bonus question: ISTR reading that something wacky happens when you try
: to combine tone and noise on the AY-3-819x -- you don't just get a
: simple summation of sounds.  Is this true, and if so, what is the exact
: behaviour?
It sounds exactly like just a sumation, on a real speccy.  One thing I have
noticed though, is that when you combine tones on real speccy its NOTHING
like the sounds Z80 makes.  I'm pretty sure the AY-3-819x is whats wrong, as
sounds become to quiet.

: Mark "or should I just reverse-engineer BBCSound/AYSound?"

--
Damion Yates - Sheffield Uni, UK.
http://www.bath.ac.uk/~exxdmy