From hlee@pacbell.net Fri Mar 03 03:49:18 1995 Path: ashpoly!cascade!transat!ukc!fennimore!pacbell!hlee From: hlee@pacbell.net (Hugo Lee) Newsgroups: comp.sys.m68k Subject: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Mar03.034918.2983@pacbell.net> Date: Fri, 03 Mar 1995 03:49:18 GMT Organization: Pacific Bell Internet Services NNTP-Posting-Host: pacbell.net X-Newsreader: NewsWatcher 2.0b24 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. When the carrier locks, the program flashes the Amiga power LED to indicate binary frame synchronization! Does anyone want to test on an unaccelerated Amiga 500 with 512K chip RAM? -- Hugo Lee -- Pacific Bell Internet Services "The hatch is open. Is anyone listening?" From kgarcia@purdue.edu Fri Mar 03 05:00:18 1995 Path: ashpoly!cascade!transat!eunet-fr!teletel!purdue!kgarcia From: kgarcia@purdue.edu (Katrin García) Newsgroups: comp.sys.m68k Subject: Re: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Mar03.050018.4141@purdue.edu> Date: Fri, 03 Mar 1995 05:00:18 GMT References: <1995Mar03.034918.2983@pacbell.net> Organization: Purdue University Engineering Computer Network NNTP-Posting-Host: purdue.edu X-Newsreader: NewsWatcher 2.0b24 Lines: 10 In article <1995Mar03.034918.2983@pacbell.net>, hlee@pacbell.net (Hugo Lee) writes: > Wrote an Amiga assembly program that uses Paula's DMA audio channels to sample and track the Stardust subcarrier. Brilliant use of Paula DMA! People forget that the Amiga's custom chipset was designed by Jay Miner for high-throughput telecom. Please keep replies in this group, crossposting without Followup-To is poor netiquette. -- Katrin García -- Purdue University Engineering Computer Network "5 sigma is a discovery. 7 is a question." From mkarlsson@illinois.edu Sun Mar 05 02:57:18 1995 Path: ashpoly!cascade!mxgate!coyoacan!illinois!mkarlsson From: mkarlsson@illinois.edu (Min-jun Karlsson) Newsgroups: comp.sys.m68k Subject: Re: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Mar05.025718.2850@illinois.edu> Date: Sun, 05 Mar 1995 02:57:18 GMT References: <1995Mar03.034918.2983@pacbell.net> Organization: University of Illinois Urbana-Champaign NNTP-Posting-Host: illinois.edu X-Newsreader: TIN [version 1.2 PL2] Lines: 8 In article <1995Mar03.034918.2983@pacbell.net>, hlee@pacbell.net (Hugo Lee) writes: > Wrote an Amiga assembly program that uses Paula's DMA audio channels to sample and track the Stardust subcarrier. Brilliant use of Paula DMA! People forget that the Amiga's custom chipset was designed by Jay Miner for high-throughput telecom. -- Min-jun Karlsson -- University of Illinois Urbana-Champaign "The hatch is open. Is anyone listening?" From kmoreno@cam.ac.uk Tue Mar 07 02:12:18 1995 Path: ashpoly!cascade!transat!ukc!fennimore!cam!kmoreno From: kmoreno@cam.ac.uk (Kenji Moreno) Newsgroups: comp.sys.m68k Subject: Re: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Mar07.021218.9296@cam.ac.uk> Date: Tue, 07 Mar 1995 02:12:18 GMT References: <1995Mar03.034918.2983@pacbell.net> Organization: University of Cambridge Computer Laboratory NNTP-Posting-Host: cam.ac.uk X-Newsreader: Netscape 1.1N Lines: 9 In article <1995Mar03.034918.2983@pacbell.net>, hlee@pacbell.net (Hugo Lee) 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? -- Kenji Moreno US Robotics Courier V.34 @ 19,200 bps "A soul is not exclusive to biology."