From ppark@titech.ac.jp Sun Dec 04 08:04:24 1994 Path: ashpoly!cascade!bigsur!titech!ppark From: ppark@titech.ac.jp (Pavel Park) Newsgroups: comp.sys.m68k Subject: Data: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1994Dec04.080424.2401@titech.ac.jp> Date: Sun, 04 Dec 1994 08:04:24 GMT Organization: Tokyo Institute of Technology Computer Centre NNTP-Posting-Host: titech.ac.jp 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. When the carrier locks, the program flashes the Amiga power LED to indicate binary frame synchronization! 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. Source code and executable will be released on Aminet under mus/misc/stardust_amiga.lha next week. -- Pavel Park Tape trading list upon request. SASE required for international mail. From kpark@earthlink.net Sun Dec 04 11:21:24 1994 Path: ashpoly!bigsur!pacrim!krgate!eunha!earthlink!kpark From: kpark@earthlink.net (Kirsty Park) Newsgroups: comp.sys.m68k Subject: Re: Data: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1994Dec04.112124.3680@earthlink.net> Date: Sun, 04 Dec 1994 11:21:24 GMT References: <1994Dec04.080424.2401@titech.ac.jp> Organization: EarthLink Network NNTP-Posting-Host: earthlink.net X-Newsreader: Netscape 1.1N Lines: 10 In article <1994Dec04.080424.2401@titech.ac.jp>, ppark@titech.ac.jp (Pavel Park) writes: > 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! Please make sure it's compatible with Kickstart 1.3 for those of us who haven't upgraded our A500s to 3.1 yet. -- Kirsty Park | kpark@earthlink.net PGP Key fingerprint: A993 2CCD FC4E F96F "Keep the channels open." From achoi@panix.com Sun Dec 04 17:41:24 1994 Path: ashpoly!cascade!mxgate!coyoacan!panix!achoi From: achoi@panix.com (Anton Choi) Newsgroups: comp.sys.m68k Subject: Re: Data: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1994Dec04.174124.8560@panix.com> Date: Sun, 04 Dec 1994 17:41:24 GMT References: <1994Dec04.080424.2401@titech.ac.jp> Organization: Public Access Unix of New York NNTP-Posting-Host: panix.com X-Newsreader: TIN [version 1.2 PL2] Lines: 10 In article <1994Dec04.080424.2401@titech.ac.jp>, ppark@titech.ac.jp (Pavel Park) writes: > 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! PC users spend $3,000 on Sound Blasters and Pentium chips and still can't do what a $500 Amiga was doing in 1985. -- Anton Choi | achoi@panix.com PGP Key fingerprint: 235C 38AD 12E8 C725 "Keep the channels open." From bramirez@ox.ac.uk Tue Dec 06 04:34:24 1994 Path: ashpoly!bigsur!pacrim!krgate!eunha!ox!bramirez From: bramirez@ox.ac.uk (Bastien Ramírez) Newsgroups: comp.sys.m68k Subject: Re: Data: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1994Dec06.043424.9097@ox.ac.uk> Date: Tue, 06 Dec 1994 04:34:24 GMT References: <1994Dec04.080424.2401@titech.ac.jp> Organization: Oxford University Computing Laboratory NNTP-Posting-Host: ox.ac.uk X-Newsreader: Netscape 1.1N Lines: 9 In article <1994Dec04.080424.2401@titech.ac.jp>, ppark@titech.ac.jp (Pavel Park) 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. -- Bastien Ramírez "Measuring a record you own is listening, not piracy." Atari Falcon 030 / SunOS 4.1.4