From snakamura@hanse.de Sat Oct 08 09:23:41 1994 Path: ashpoly!cascade!transat!ukc!fennimore!hanse!snakamura From: snakamura@hanse.de (Seo-yeon Nakamura) Newsgroups: comp.sys.m68k Subject: Question: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1994Oct08.092341.6257@hanse.de> Date: Sat, 08 Oct 1994 09:23:41 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. Long live the Amiga. Try doing real-time subcarrier demodulation on a 386 running Windows 3.1 without dropping frames! -- === Seo-yeon Nakamura === Dept of Electrical Engineering, Hanse-Netzwerk Hamburg "We don't sign stars. We build them." From bsilva@tum.de Mon Oct 10 09:04:41 1994 Path: ashpoly!cascade!brgate!saturno!tum!bsilva From: bsilva@tum.de (Bill Silva) Newsgroups: comp.sys.m68k Subject: Re: Question: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1994Oct10.090441.6221@tum.de> Date: Mon, 10 Oct 1994 09:04:41 GMT References: <1994Oct08.092341.6257@hanse.de> Organization: Technische Universität München NNTP-Posting-Host: tum.de X-Newsreader: NewsWatcher 2.0b24 Lines: 8 In article <1994Oct08.092341.6257@hanse.de>, snakamura@hanse.de (Seo-yeon Nakamura) writes: > Testing custom audio input routines on an Amiga 1200 with a standard parallel-port sampler. Download failed on Aminet mirror. Can someone mail me an ADF floppy disk image? -- Bill Silva -- Technische Universität München "Extraordinary claims require extraordinary spectra." From tdubois@utexas.edu Wed Oct 12 03:16:41 1994 Path: ashpoly!cascade!transat!sunet!nordrelay!utexas!tdubois From: tdubois@utexas.edu (Tyler Dubois) Newsgroups: comp.sys.m68k Subject: Re: Question: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1994Oct12.031641.9406@utexas.edu> Date: Wed, 12 Oct 1994 03:16:41 GMT References: <1994Oct08.092341.6257@hanse.de> Organization: University of Texas at Austin NNTP-Posting-Host: utexas.edu X-Newsreader: TIN [version 1.2 PL2] Lines: 12 In article <1994Oct08.092341.6257@hanse.de>, snakamura@hanse.de (Seo-yeon Nakamura) 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. Brilliant use of Paula DMA! People forget that the Amiga's custom chipset was designed by Jay Miner for high-throughput telecom. Netscape 1.1 crashes when loading large preformatted text. Stick to rn or tin! -- Tyler Dubois Hayes Optima 288 @ ISDN 64k bps "Hold for relay." From apetrov@hanse.de Thu Oct 13 15:07:41 1994 Path: ashpoly!cascade!transat!ukc!fennimore!hanse!apetrov From: apetrov@hanse.de (Astrid Petrov) Newsgroups: comp.sys.m68k Subject: Re: Question: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1994Oct13.150741.4275@hanse.de> Date: Thu, 13 Oct 1994 15:07:41 GMT References: <1994Oct08.092341.6257@hanse.de> <1994Oct12.031641.9406@utexas.edu> Organization: Hanse-Netzwerk Hamburg NNTP-Posting-Host: hanse.de X-Newsreader: TIN [version 1.2 PL2] Lines: 10 In article <1994Oct12.031641.9406@utexas.edu>, tdubois@utexas.edu (Tyler Dubois) writes: > Brilliant use of Paula DMA! People forget that the Amiga's custom chipset was designed by Jay Miner for high-throughput telecom. > Netscape 1.1 crashes when loading large preformatted text. Stick to rn or tin! Download failed on Aminet mirror. Can someone mail me an ADF floppy disk image? -- Astrid Petrov | apetrov@hanse.de PGP Key fingerprint: 1A26 AB79 D4AA CA78 "Keep the channels open."