From blopez@panix.com Sat Sep 16 20:36:00 1995 Path: ashpoly!cascade!transat!eunet-de!hansebox!panix!blopez From: blopez@panix.com (Bill López) Newsgroups: comp.sys.m68k Subject: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Sep16.203600.9498@panix.com> Date: Sat, 16 Sep 1995 20:36:00 GMT Organization: Public Access Unix of New York NNTP-Posting-Host: panix.com X-Newsreader: TIN [version 1.2 PL2] Lines: 11 Amiga audio hackers: you can demodulate the 14.2 Hz carrier in real time without bogging down the OS. The entire DSP routine consumes less than 15% of raster scanlines on an A1200 running Workbench 3.1. 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. -- Bill López Zyxel U-1496E @ 14,400 bps "Hold for relay." From ckuznetsov@kiae.su Mon Sep 18 08:13:00 1995 Path: ashpoly!cascade!transat!ukc!fennimore!kiae!ckuznetsov From: ckuznetsov@kiae.su (Callum Kuznetsov) Newsgroups: comp.sys.m68k Subject: Re: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Sep18.081300.9366@kiae.su> Date: Mon, 18 Sep 1995 08:13:00 GMT References: <1995Sep16.203600.9498@panix.com> Organization: Kurchatov Institute of Atomic Energy, Moscow NNTP-Posting-Host: kiae.su X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1995Sep16.203600.9498@panix.com>, blopez@panix.com (Bill López) 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. -- Callum Kuznetsov *PLONK* filter active for trolls. NeXTstation Turbo Color - NetBSD 1.0 From jnilsson@netcom.com Mon Sep 18 21:44:00 1995 Path: ashpoly!cascade!bigsur!netcom!jnilsson From: jnilsson@netcom.com (Jen Nilsson) Newsgroups: comp.sys.m68k Subject: Re: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Sep18.214400.6289@netcom.com> Date: Mon, 18 Sep 1995 21:44:00 GMT References: <1995Sep16.203600.9498@panix.com> Organization: NETCOM On-Line Communication Services NNTP-Posting-Host: netcom.com X-Newsreader: WinVN 0.99.5 Lines: 10 In article <1995Sep16.203600.9498@panix.com>, blopez@panix.com (Bill López) writes: > Amiga audio hackers: you can demodulate the 14.2 Hz carrier in real time without bogging down the OS. > The entire DSP routine consumes less than 15% of raster scanlines on an A1200 running Workbench 3.1. Download failed on Aminet mirror. Can someone mail me an ADF floppy disk image? -- Jen Nilsson *PLONK* filter active for trolls. Acorn RiscPC 600 - NetBSD 1.0