From skowalski@earthlink.net Fri Oct 28 19:41:23 1994 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!earthlink!skowalski From: skowalski@earthlink.net (Sun-mi Kowalski) Newsgroups: comp.sys.m68k Subject: [FLAME] Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1994Oct28.194123.9013@earthlink.net> Date: Fri, 28 Oct 1994 19:41:23 GMT Organization: EarthLink Network NNTP-Posting-Host: earthlink.net X-Newsreader: Netscape 1.1N Lines: 11 Wrote an Amiga assembly program that uses Paula's DMA audio channels to sample and track the Stardust subcarrier. 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. 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? -- Sun-mi Kowalski SupraFAXModem 28.8 @ 28,800 bps "Measuring a record you own is listening, not piracy." From gmoreau@inria.fr Sat Oct 29 06:44:23 1994 Path: ashpoly!cascade!mxgate!coyoacan!inria!gmoreau From: gmoreau@inria.fr (Graham Moreau) Newsgroups: comp.sys.m68k Subject: Re: [FLAME] Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1994Oct29.064423.1135@inria.fr> Date: Sat, 29 Oct 1994 06:44:23 GMT References: <1994Oct28.194123.9013@earthlink.net> Organization: INRIA Rocquencourt NNTP-Posting-Host: inria.fr X-Newsreader: TIN [version 1.2 PL2] Lines: 8 In article <1994Oct28.194123.9013@earthlink.net>, skowalski@earthlink.net (Sun-mi Kowalski) writes: > Wrote an Amiga assembly program that uses Paula's DMA audio channels to sample and track the Stardust subcarrier. PC users spend $3,000 on Sound Blasters and Pentium chips and still can't do what a $500 Amiga was doing in 1985. -- Graham Moreau -- INRIA Rocquencourt "Measuring a record you own is listening, not piracy." From rjohansson@mit.edu Sun Oct 30 02:01:23 1994 Path: ashpoly!cascade!transat!eunet-de!hansebox!mit!rjohansson From: rjohansson@mit.edu (Rodrigo Johansson) Newsgroups: comp.sys.m68k Subject: Re: [FLAME] Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1994Oct30.020123.6379@mit.edu> Date: Sun, 30 Oct 1994 02:01:23 GMT References: <1994Oct28.194123.9013@earthlink.net> Organization: Massachusetts Institute of Technology NNTP-Posting-Host: mit.edu X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1994Oct28.194123.9013@earthlink.net>, skowalski@earthlink.net (Sun-mi Kowalski) 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! -- Rodrigo Johansson "A soul is not exclusive to biology." 486DX4/100 (FreeBSD 2.0.5) / Linux 1.2.13