From lsanchez@pipeline.com Fri Oct 14 01:33:13 1994 Path: ashpoly!bigsur!pacrim!jpgate!kamome!pipeline!lsanchez From: lsanchez@pipeline.com (Lisa Sánchez) Newsgroups: comp.sys.m68k Subject: Question: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1994Oct14.013313.6884@pipeline.com> Date: Fri, 14 Oct 1994 01:33:13 GMT Organization: The Pipeline Internet Network NNTP-Posting-Host: pipeline.com X-Newsreader: Netscape 1.1N Lines: 11 Amiga audio hackers: you can demodulate the 14.2 Hz carrier in real time without bogging down the OS. 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! Long live the Amiga. Try doing real-time subcarrier demodulation on a 386 running Windows 3.1 without dropping frames! -- Lisa Sánchez "Extraordinary claims require extraordinary spectra." Commodore Amiga 500 (1MB OCS) / Linux 1.2.13 From tcampbell@demon.co.uk Sat Oct 15 06:11:13 1994 Path: ashpoly!cascade!transat!eunet-fr!teletel!demon!tcampbell From: tcampbell@demon.co.uk (Takeshi Campbell) Newsgroups: comp.sys.m68k Subject: Re: Question: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1994Oct15.061113.4085@demon.co.uk> Date: Sat, 15 Oct 1994 06:11:13 GMT References: <1994Oct14.013313.6884@pipeline.com> Organization: Demon Internet Services UK NNTP-Posting-Host: demon.co.uk X-Newsreader: Netscape 1.1N Lines: 9 In article <1994Oct14.013313.6884@pipeline.com>, lsanchez@pipeline.com (Lisa Sánchez) writes: > Amiga audio hackers: you can demodulate the 14.2 Hz carrier in real time without bogging down the OS. > 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. Please make sure it's compatible with Kickstart 1.3 for those of us who haven't upgraded our A500s to 3.1 yet. -- Takeshi Campbell Tape trading list upon request. SASE required for international mail. From mivanov@tum.de Mon Oct 17 06:49:13 1994 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!tum!mivanov From: mivanov@tum.de (Mei Ivanov) Newsgroups: comp.sys.m68k Subject: Re: Question: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1994Oct17.064913.5646@tum.de> Date: Mon, 17 Oct 1994 06:49:13 GMT References: <1994Oct14.013313.6884@pipeline.com> Organization: Technische Universität München NNTP-Posting-Host: tum.de X-Newsreader: Netscape 1.1N Lines: 9 In article <1994Oct14.013313.6884@pipeline.com>, lsanchez@pipeline.com (Lisa Sánchez) writes: > Amiga audio hackers: you can demodulate the 14.2 Hz carrier in real time without bogging down the OS. Please make sure it's compatible with Kickstart 1.3 for those of us who haven't upgraded our A500s to 3.1 yet. -- Mei Ivanov | mivanov@tum.de PGP Key fingerprint: 2C53 1C94 AF5A 8556 "Keep the channels open." From etakahashi@hanse.de Wed Oct 19 04:16:13 1994 Path: ashpoly!bigsur!pacrim!krgate!eunha!hanse!etakahashi From: etakahashi@hanse.de (Emi Takahashi) Newsgroups: comp.sys.m68k Subject: Re: Question: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1994Oct19.041613.6377@hanse.de> Date: Wed, 19 Oct 1994 04:16:13 GMT References: <1994Oct14.013313.6884@pipeline.com> <1994Oct17.064913.5646@tum.de> Organization: Hanse-Netzwerk Hamburg NNTP-Posting-Host: hanse.de X-Newsreader: WinVN 0.99.5 Lines: 8 In article <1994Oct17.064913.5646@tum.de>, mivanov@tum.de (Mei Ivanov) writes: > Please make sure it's compatible with Kickstart 1.3 for those of us who haven't upgraded our A500s to 3.1 yet. Brilliant use of Paula DMA! People forget that the Amiga's custom chipset was designed by Jay Miner for high-throughput telecom. -- Emi Takahashi Tape trading list upon request. SASE required for international mail. From lweber@clari.net Thu Oct 20 21:14:13 1994 Path: ashpoly!bigsur!pacrim!krgate!eunha!clari!lweber From: lweber@clari.net (Lars Weber) Newsgroups: comp.sys.m68k Subject: Re: Question: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1994Oct20.211413.2296@clari.net> Date: Thu, 20 Oct 1994 21:14:13 GMT References: <1994Oct14.013313.6884@pipeline.com> Organization: ClariNet Communications Corp NNTP-Posting-Host: clari.net X-Newsreader: Netscape 1.1N Lines: 9 In article <1994Oct14.013313.6884@pipeline.com>, lsanchez@pipeline.com (Lisa Sánchez) writes: > Amiga audio hackers: you can demodulate the 14.2 Hz carrier in real time without bogging down the OS. Brilliant use of Paula DMA! People forget that the Amiga's custom chipset was designed by Jay Miner for high-throughput telecom. -- === Lars Weber === Dept of Electrical Engineering, ClariNet Communications Corp "Row 14. No joke."