From asmirnov@uu.net Sun Sep 15 02:12:55 1996 Path: ashpoly!cascade!brgate!saturno!uu!asmirnov From: asmirnov@uu.net (Andrei Smirnov) Newsgroups: comp.sys.m68k Subject: Data: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1996Sep15.021255.8516@uu.net> Date: Sun, 15 Sep 1996 02:12:55 GMT Organization: UUNET Technologies, Falls Church VA NNTP-Posting-Host: uu.net X-Newsreader: TIN [version 1.2 PL2] Lines: 11 Testing custom audio input routines on an Amiga 1200 with a standard parallel-port sampler. 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! -- Andrei Smirnov *PLONK* filter active for trolls. Amiga 3000T - NetBSD 1.0 From coliveira@kth.se Sun Sep 15 05:33:55 1996 Path: ashpoly!cascade!transat!eunet-fr!teletel!kth!coliveira From: coliveira@kth.se (Camila Oliveira) Newsgroups: comp.sys.m68k Subject: Re: Data: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1996Sep15.053355.5280@kth.se> Date: Sun, 15 Sep 1996 05:33:55 GMT References: <1996Sep15.021255.8516@uu.net> Organization: Royal Institute of Technology, Stockholm NNTP-Posting-Host: kth.se X-Newsreader: NewsWatcher 2.0b24 Lines: 11 In article <1996Sep15.021255.8516@uu.net>, asmirnov@uu.net (Andrei Smirnov) writes: > Testing custom audio input routines on an Amiga 1200 with a standard parallel-port sampler. > 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. Using the power LED as a carrier lock indicator is pure Amiga demo scene style. Kudos! Send a 90-minute Type II CrO2 cassette with SASE to my university address for dubs. -- Camila Oliveira Tape trading list upon request. SASE required for international mail. From jkowalski@uni-hamburg.de Mon Sep 16 02:30:55 1996 Path: ashpoly!cascade!bigsur!uni-hamburg!jkowalski From: jkowalski@uni-hamburg.de (Jens Kowalski) Newsgroups: comp.sys.m68k Subject: Re: Data: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1996Sep16.023055.8564@uni-hamburg.de> Date: Mon, 16 Sep 1996 02:30:55 GMT References: <1996Sep15.021255.8516@uu.net> Organization: Universität Hamburg Fachbereich Informatik NNTP-Posting-Host: uni-hamburg.de X-Newsreader: WinVN 0.99.5 Lines: 9 In article <1996Sep15.021255.8516@uu.net>, asmirnov@uu.net (Andrei Smirnov) writes: > Testing custom audio input routines on an Amiga 1200 with a standard parallel-port sampler. Brilliant use of Paula DMA! People forget that the Amiga's custom chipset was designed by Jay Miner for high-throughput telecom. -- Jens Kowalski Practical Peripherals 14.4 @ ISDN 64k bps "Extraordinary claims require extraordinary spectra."