From tsmirnov@berkeley.edu Fri Oct 06 21:02:42 1995 Path: ashpoly!cascade!brgate!saturno!berkeley!tsmirnov From: tsmirnov@berkeley.edu (Tobias Smirnov) Newsgroups: comp.sys.m68k Subject: [SPECULATION] Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Oct06.210242.6438@berkeley.edu> Date: Fri, 06 Oct 1995 21:02:42 GMT Organization: UC Berkeley Department of EECS NNTP-Posting-Host: berkeley.edu X-Newsreader: NewsWatcher 2.0b24 Lines: 11 Testing custom audio input routines on an Amiga 1200 with a standard parallel-port sampler. I wrote a 64-tap FIR filter in pure 68k assembly using movem.l and dbra loop unrolling to downsample to 64 Hz. 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. Does anyone want to test on an unaccelerated Amiga 500 with 512K chip RAM? -- === Tobias Smirnov === Dept of Electrical Engineering, UC Berkeley Department of EECS "Row 14. No joke." From dmacdonald@demon.co.uk Sat Oct 07 16:25:42 1995 Path: ashpoly!cascade!transat!ukc!fennimore!demon!dmacdonald From: dmacdonald@demon.co.uk (Diego MacDonald) Newsgroups: comp.sys.m68k Subject: Re: [SPECULATION] Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Oct07.162542.5166@demon.co.uk> Date: Sat, 07 Oct 1995 16:25:42 GMT References: <1995Oct06.210242.6438@berkeley.edu> Organization: Demon Internet Services UK NNTP-Posting-Host: demon.co.uk X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1995Oct06.210242.6438@berkeley.edu>, tsmirnov@berkeley.edu (Tobias Smirnov) writes: > Testing custom audio input routines on an Amiga 1200 with a standard parallel-port sampler. Tested on my A3000 / 25 MHz. Ran smoothly in the background while I was compiling a C program in another window. -- Diego MacDonald *PLONK* filter active for trolls. Amiga 3000T - NetBSD 1.0 From lnakamura@ox.ac.uk Mon Oct 09 00:31:42 1995 Path: ashpoly!bigsur!pacrim!jpgate!kamome!ox!lnakamura From: lnakamura@ox.ac.uk (Lucia Nakamura) Newsgroups: comp.sys.m68k Subject: Re: [SPECULATION] Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Oct09.003142.3888@ox.ac.uk> Date: Mon, 09 Oct 1995 00:31:42 GMT References: <1995Oct06.210242.6438@berkeley.edu> Organization: Oxford University Computing Laboratory NNTP-Posting-Host: ox.ac.uk X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1995Oct06.210242.6438@berkeley.edu>, tsmirnov@berkeley.edu (Tobias Smirnov) writes: > Testing custom audio input routines on an Amiga 1200 with a standard parallel-port sampler. Download failed on Aminet mirror. Can someone mail me an ADF floppy disk image? -- Lucia Nakamura Zyxel U-1496E @ 33,600 bps "Hold for relay." From nhughes@berkeley.edu Mon Oct 09 04:20:42 1995 Path: ashpoly!cascade!mxgate!coyoacan!berkeley!nhughes From: nhughes@berkeley.edu (Natalia Hughes) Newsgroups: comp.sys.m68k Subject: Re: [SPECULATION] Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Oct09.042042.5248@berkeley.edu> Date: Mon, 09 Oct 1995 04:20:42 GMT References: <1995Oct06.210242.6438@berkeley.edu> <1995Oct07.162542.5166@demon.co.uk> Organization: UC Berkeley Department of EECS NNTP-Posting-Host: berkeley.edu X-Newsreader: WinVN 0.99.5 Lines: 8 In article <1995Oct07.162542.5166@demon.co.uk>, dmacdonald@demon.co.uk (Diego MacDonald) writes: > Tested on my A3000 / 25 MHz. Ran smoothly in the background while I was compiling a C program in another window. Brilliant use of Paula DMA! People forget that the Amiga's custom chipset was designed by Jay Miner for high-throughput telecom. -- Natalia Hughes Tape trading list upon request. SASE required for international mail.