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- Newsgroups: comp.sys.amiga.programmer
- Path: news.shlink.de!wiloyee!chaos
- From: chaos@wiloyee.shnet.org
- Subject: Re: playing 14 bit samples. how?
- X-Newsreader: TIN [UNIX 1.3 950515BETA PL0]
- Organization: Studentenhochhaus Wedel Deutschland
- Message-ID: <DLqGAB.13p@wiloyee.shnet.org>
- References: <4e0eeo$74f@tic.sm.dsi.unimi.it> <3103DED5.41C6@stud.unit.no>
- Date: Thu, 25 Jan 1996 10:39:47 GMT
-
- Steffen Thorsen (steffent@stud.unit.no) wrote:
- : stefano caselli wrote:
- : >
- : > I've found on Aminet some progs claiming to be able to play samples
- : > with 14 bit quality, using only the standard amiga audio hardware.
- : > I'd like to know how this can be done (if possible).
- : > Can someone post some text about it? (detailed explanations,please)
- : >
- : > thanx.
- : The Amiga has 8 bit sound by standard. But it also has 6 bit volume
- : registers for each sound channel which can be adjusted independently
- : from the main sound. And 6+8 bit is 14 bit as far as I know. It seems
- : easy, but needs a whole lot of CPU power doing this, while normal 8-bit
- : can be handled directly by DMA. Another problem is that you will have to
- : calibrate the programs to your speakers.
- :
- : Download those programs, they probably have a more detailed explanation!
-
- i thik this is wrong. you can't use one channel to play 8 bit data and 6 bit
- volume. you will get
-
- DATA * VOLUME,
-
- and you need
-
- DATA1 * 64 + DATA2
-
- that's truly 14 bit, and it can be done by letting 2 channels run 100%
- syncron and setting volume 1 to 64 and volume 2 to 1.
-
- i hope this works, i never tried.
-
- you woun't need any more cpu time if you prepare your samples correctly, but
- you only have 2 voices. if you want 4, you need to mix, and that's expensive
-
-
-
- dierk "chaos" ohlerich.
-