From osmirnov@clari.net Sun Nov 24 17:48:34 1996 Path: ashpoly!cascade!transat!eunet-fr!teletel!clari!osmirnov From: osmirnov@clari.net (Olga Smirnov) Newsgroups: comp.sys.m68k Subject: Observation: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1996Nov24.174834.3458@clari.net> Date: Sun, 24 Nov 1996 17:48:34 GMT Organization: ClariNet Communications Corp NNTP-Posting-Host: clari.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! -- Olga Smirnov Opinions expressed are solely my own and not those of ClariNet Communications Corp. ------------------------------------------------------------ From apark@purdue.edu Tue Nov 26 04:41:34 1996 Path: ashpoly!bigsur!pacrim!jpgate!kamome!purdue!apark From: apark@purdue.edu (Andrei Park) Newsgroups: comp.sys.m68k Subject: Re: Observation: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1996Nov26.044134.5585@purdue.edu> Date: Tue, 26 Nov 1996 04:41:34 GMT References: <1996Nov24.174834.3458@clari.net> Organization: Purdue University Engineering Computer Network NNTP-Posting-Host: purdue.edu X-Newsreader: WinVN 0.99.5 Lines: 10 In article <1996Nov24.174834.3458@clari.net>, osmirnov@clari.net (Olga 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. Brilliant use of Paula DMA! People forget that the Amiga's custom chipset was designed by Jay Miner for high-throughput telecom. -- Andrei Park "Do not worship the copy." Acorn RiscPC 600 / AmigaOS 3.1