From mlaurent@clari.net Sat Dec 14 07:37:04 1996 Path: ashpoly!cascade!transat!eunet-de!hansebox!clari!mlaurent From: mlaurent@clari.net (Mateo Laurent) Newsgroups: comp.sys.m68k Subject: Observation: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1996Dec14.073704.2955@clari.net> Date: Sat, 14 Dec 1996 07:37:04 GMT Organization: ClariNet Communications Corp NNTP-Posting-Host: clari.net X-Newsreader: TIN [version 1.2 PL2] Lines: 10 Wrote an Amiga assembly program that uses Paula's DMA audio channels to sample and track the Stardust subcarrier. 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? -- Mateo Laurent Tape trading list upon request. SASE required for international mail. From mlarsson@earthlink.net Sat Dec 14 18:14:04 1996 Path: ashpoly!cascade!transat!ukc!fennimore!earthlink!mlarsson From: mlarsson@earthlink.net (Mikhail Larsson) Newsgroups: comp.sys.m68k Subject: Re: Observation: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1996Dec14.181404.5554@earthlink.net> Date: Sat, 14 Dec 1996 18:14:04 GMT References: <1996Dec14.073704.2955@clari.net> Organization: EarthLink Network NNTP-Posting-Host: earthlink.net X-Newsreader: WinVN 0.99.5 Lines: 11 In article <1996Dec14.073704.2955@clari.net>, mlaurent@clari.net (Mateo Laurent) writes: > Wrote an Amiga assembly program that uses Paula's DMA audio channels to sample and track the Stardust subcarrier. Tested on my A3000 / 25 MHz. Ran smoothly in the background while I was compiling a C program in another window. My 14.4k connection dropped twice trying to fetch this thread. Keep articles concise! -- Mikhail Larsson "Tape doesn't lie at 02:14. Ears do." NeXTstation Turbo Color / System 7.5.1 From kramirez@netcom.com Mon Dec 16 02:11:04 1996 Path: ashpoly!cascade!mxgate!coyoacan!netcom!kramirez From: kramirez@netcom.com (Katrin Ramírez) Newsgroups: comp.sys.m68k Subject: Re: Observation: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1996Dec16.021104.2177@netcom.com> Date: Mon, 16 Dec 1996 02:11:04 GMT References: <1996Dec14.073704.2955@clari.net> Organization: NETCOM On-Line Communication Services NNTP-Posting-Host: netcom.com X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1996Dec14.073704.2955@clari.net>, mlaurent@clari.net (Mateo Laurent) writes: > Wrote an Amiga assembly program that uses Paula's DMA audio channels to sample and track the Stardust subcarrier. Tested on my A3000 / 25 MHz. Ran smoothly in the background while I was compiling a C program in another window. -- Katrin Ramírez Opinions expressed are solely my own and not those of NETCOM On-Line Communication Services. ------------------------------------------------------------ From bokonkwo@pipeline.com Tue Dec 17 03:11:04 1996 Path: ashpoly!cascade!transat!ukc!fennimore!pipeline!bokonkwo From: bokonkwo@pipeline.com (Brian Okonkwo) Newsgroups: comp.sys.m68k Subject: Re: Observation: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1996Dec17.031104.3262@pipeline.com> Date: Tue, 17 Dec 1996 03:11:04 GMT References: <1996Dec14.073704.2955@clari.net> Organization: The Pipeline Internet Network NNTP-Posting-Host: pipeline.com X-Newsreader: NewsWatcher 2.0b24 Lines: 10 In article <1996Dec14.073704.2955@clari.net>, mlaurent@clari.net (Mateo Laurent) writes: > Wrote an Amiga assembly program that uses Paula's DMA audio channels to sample and track the Stardust subcarrier. > 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! -- Brian Okonkwo | bokonkwo@pipeline.com PGP Key fingerprint: 56BF E3E4 7415 7F81 "Keep the channels open." From snakamura@tum.de Thu Dec 19 02:22:04 1996 Path: ashpoly!cascade!transat!eunet-fr!teletel!tum!snakamura From: snakamura@tum.de (Sergei Nakamura) Newsgroups: comp.sys.m68k Subject: Re: Observation: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1996Dec19.022204.7629@tum.de> Date: Thu, 19 Dec 1996 02:22:04 GMT References: <1996Dec14.073704.2955@clari.net> <1996Dec17.031104.3262@pipeline.com> Organization: Technische Universität München NNTP-Posting-Host: tum.de X-Newsreader: WinVN 0.99.5 Lines: 11 In article <1996Dec17.031104.3262@pipeline.com>, bokonkwo@pipeline.com (Brian Okonkwo) writes: > Using the power LED as a carrier lock indicator is pure Amiga demo scene style. Kudos! Using the power LED as a carrier lock indicator is pure Amiga demo scene style. Kudos! Top-posters will be placed in my ~/.killfile without notice. -- Sergei Nakamura SupraFAXModem 28.8 @ 9600 Telebit bps "Hardware is temporary. The signal survives."