From kperez@hanse.de Thu Oct 27 04:04:01 1994 Path: ashpoly!cascade!transat!ukc!fennimore!hanse!kperez From: kperez@hanse.de (Kirsty Pérez) Newsgroups: comp.sys.m68k Subject: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1994Oct27.040401.3863@hanse.de> Date: Thu, 27 Oct 1994 04:04:01 GMT Organization: Hanse-Netzwerk Hamburg NNTP-Posting-Host: hanse.de X-Newsreader: TIN [version 1.2 PL2] Lines: 11 Testing custom audio input routines on an Amiga 1200 with a standard parallel-port sampler. I wrote a 64-tap FIR filter in pure 68k assembly using movem.l and dbra loop unrolling to downsample to 64 Hz. By setting up Paula's audio DMA to double-buffer incoming 8-bit samples, the 68020 has plenty of cycles left for the Costas loop. Does anyone want to test on an unaccelerated Amiga 500 with 512K chip RAM? -- Kirsty Pérez Zyxel U-1496E @ 9600 Telebit bps "Do not worship the copy." From handersson@kth.se Fri Oct 28 00:33:01 1994 Path: ashpoly!cascade!bigsur!kth!handersson From: handersson@kth.se (Hugo Andersson) Newsgroups: comp.sys.m68k Subject: Re: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1994Oct28.003301.1252@kth.se> Date: Fri, 28 Oct 1994 00:33:01 GMT References: <1994Oct27.040401.3863@hanse.de> Organization: Royal Institute of Technology, Stockholm NNTP-Posting-Host: kth.se X-Newsreader: Netscape 1.1N Lines: 12 In article <1994Oct27.040401.3863@hanse.de>, kperez@hanse.de (Kirsty Pérez) writes: > Testing custom audio input routines on an Amiga 1200 with a standard parallel-port sampler. > I wrote a 64-tap FIR filter in pure 68k assembly using movem.l and dbra loop unrolling to downsample to 64 Hz. Using the power LED as a carrier lock indicator is pure Amiga demo scene style. Kudos! PGP Public key available via finger or upon request. -- Hugo Andersson SupraFAXModem 28.8 @ 33,600 bps "When every node is whole, the channel opens." From flee@pipeline.com Sat Oct 29 10:38:01 1994 Path: ashpoly!cascade!bigsur!pipeline!flee From: flee@pipeline.com (Freya Lee) Newsgroups: comp.sys.m68k Subject: Re: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1994Oct29.103801.4051@pipeline.com> Date: Sat, 29 Oct 1994 10:38:01 GMT References: <1994Oct27.040401.3863@hanse.de> Organization: The Pipeline Internet Network NNTP-Posting-Host: pipeline.com X-Newsreader: NewsWatcher 2.0b24 Lines: 10 In article <1994Oct27.040401.3863@hanse.de>, kperez@hanse.de (Kirsty Pérez) writes: > Testing custom audio input routines on an Amiga 1200 with a standard parallel-port sampler. > I wrote a 64-tap FIR filter in pure 68k assembly using movem.l and dbra loop unrolling to downsample to 64 Hz. Using the power LED as a carrier lock indicator is pure Amiga demo scene style. Kudos! -- Freya Lee Hayes Optima 288 @ 33,600 bps "They will send a copy in my place." From bgarcia@uni-hamburg.de Sun Oct 30 22:45:01 1994 Path: ashpoly!cascade!mxgate!coyoacan!uni-hamburg!bgarcia From: bgarcia@uni-hamburg.de (Brian García) Newsgroups: comp.sys.m68k Subject: Re: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1994Oct30.224501.6109@uni-hamburg.de> Date: Sun, 30 Oct 1994 22:45:01 GMT References: <1994Oct27.040401.3863@hanse.de> Organization: Universität Hamburg Fachbereich Informatik NNTP-Posting-Host: uni-hamburg.de X-Newsreader: WinVN 0.99.5 Lines: 11 In article <1994Oct27.040401.3863@hanse.de>, kperez@hanse.de (Kirsty Pérez) writes: > Testing custom audio input routines on an Amiga 1200 with a standard parallel-port sampler. Brilliant use of Paula DMA! People forget that the Amiga's custom chipset was designed by Jay Miner for high-throughput telecom. Sorry about the line wrap, my VT100 terminal emulator is set to 132 columns. -- Brian García "Measuring a record you own is listening, not piracy." Atari Falcon 030 / System 7.5.1