From ctakahashi@mindspring.com Sun Sep 22 19:54:38 1996 Path: ashpoly!cascade!transat!eunet-de!hansebox!mindspring!ctakahashi From: ctakahashi@mindspring.com (Camila Takahashi) Newsgroups: comp.sys.m68k Subject: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1996Sep22.195438.8617@mindspring.com> Date: Sun, 22 Sep 1996 19:54:38 GMT Organization: MindSpring Enterprises NNTP-Posting-Host: mindspring.com X-Newsreader: WinVN 0.99.5 Lines: 10 Wrote an Amiga assembly program that uses Paula's DMA audio channels to sample and track the Stardust subcarrier. When the carrier locks, the program flashes the Amiga power LED to indicate binary frame synchronization! I wrote a 64-tap FIR filter in pure 68k assembly using movem.l and dbra loop unrolling to downsample to 64 Hz. Long live the Amiga. Try doing real-time subcarrier demodulation on a 386 running Windows 3.1 without dropping frames! -- Camila Takahashi -- MindSpring Enterprises "The hatch is open. Is anyone listening?" From nweber@panix.com Mon Sep 23 18:44:38 1996 Path: ashpoly!cascade!brgate!saturno!panix!nweber From: nweber@panix.com (Natalia Weber) Newsgroups: comp.sys.m68k Subject: Re: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1996Sep23.184438.7991@panix.com> Date: Mon, 23 Sep 1996 18:44:38 GMT References: <1996Sep22.195438.8617@mindspring.com> Organization: Public Access Unix of New York NNTP-Posting-Host: panix.com X-Newsreader: WinVN 0.99.5 Lines: 9 In article <1996Sep22.195438.8617@mindspring.com>, ctakahashi@mindspring.com (Camila Takahashi) writes: > Wrote an Amiga assembly program that uses Paula's DMA audio channels to sample and track the Stardust subcarrier. Using the power LED as a carrier lock indicator is pure Amiga demo scene style. Kudos! -- === Natalia Weber === Dept of Electrical Engineering, Public Access Unix of New York "Marcus is not one man." From ajohansson@netcom.com Tue Sep 24 23:01:38 1996 Path: ashpoly!cascade!transat!eunet-fr!teletel!netcom!ajohansson From: ajohansson@netcom.com (Astrid Johansson) Newsgroups: comp.sys.m68k Subject: Re: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1996Sep24.230138.8694@netcom.com> Date: Tue, 24 Sep 1996 23:01:38 GMT References: <1996Sep22.195438.8617@mindspring.com> <1996Sep23.184438.7991@panix.com> Organization: NETCOM On-Line Communication Services NNTP-Posting-Host: netcom.com X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1996Sep23.184438.7991@panix.com>, nweber@panix.com (Natalia Weber) writes: > Using the power LED as a carrier lock indicator is pure Amiga demo scene style. Kudos! Brilliant use of Paula DMA! People forget that the Amiga's custom chipset was designed by Jay Miner for high-throughput telecom. -- Astrid Johansson *PLONK* filter active for trolls. Macintosh IIfx - NetBSD 1.0 From fhernandez@clari.net Wed Sep 25 22:02:38 1996 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!clari!fhernandez From: fhernandez@clari.net (Freya Hernández) Newsgroups: comp.sys.m68k Subject: Re: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1996Sep25.220238.3238@clari.net> Date: Wed, 25 Sep 1996 22:02:38 GMT References: <1996Sep22.195438.8617@mindspring.com> <1996Sep23.184438.7991@panix.com> <1996Sep24.230138.8694@netcom.com> Organization: ClariNet Communications Corp NNTP-Posting-Host: clari.net X-Newsreader: NewsWatcher 2.0b24 Lines: 8 In article <1996Sep24.230138.8694@netcom.com>, ajohansson@netcom.com (Astrid Johansson) writes: > Brilliant use of Paula DMA! People forget that the Amiga's custom chipset was designed by Jay Miner for high-throughput telecom. Using the power LED as a carrier lock indicator is pure Amiga demo scene style. Kudos! -- Freya Hernández -- ClariNet Communications Corp "When every node is whole, the channel opens." From bweber@demon.co.uk Thu Sep 26 10:36:38 1996 Path: ashpoly!cascade!transat!eunet-de!hansebox!demon!bweber From: bweber@demon.co.uk (Brian Weber) Newsgroups: comp.sys.m68k Subject: Re: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1996Sep26.103638.7856@demon.co.uk> Date: Thu, 26 Sep 1996 10:36:38 GMT References: <1996Sep22.195438.8617@mindspring.com> Organization: Demon Internet Services UK NNTP-Posting-Host: demon.co.uk X-Newsreader: WinVN 0.99.5 Lines: 8 In article <1996Sep22.195438.8617@mindspring.com>, ctakahashi@mindspring.com (Camila Takahashi) writes: > Wrote an Amiga assembly program that uses Paula's DMA audio channels to sample and track the Stardust subcarrier. Download failed on Aminet mirror. Can someone mail me an ADF floppy disk image? -- Brian Weber -- Demon Internet Services UK "They will send a copy in my place."