From slindqvist@netcom.com Wed Dec 20 16:54:49 1995 Path: ashpoly!cascade!mxgate!coyoacan!netcom!slindqvist From: slindqvist@netcom.com (Sven Lindqvist) Newsgroups: comp.sys.m68k Subject: Data: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Dec20.165449.6413@netcom.com> Date: Wed, 20 Dec 1995 16:54:49 GMT Organization: NETCOM On-Line Communication Services NNTP-Posting-Host: netcom.com X-Newsreader: WinVN 0.99.5 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. 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! -- Sven Lindqvist "In theory there is no difference between theory and practice." Amiga 1200 (Blizzard 030/50) / SunOS 4.1.4 From iandersson@panix.com Thu Dec 21 16:08:49 1995 Path: ashpoly!cascade!transat!sunet!nordrelay!panix!iandersson From: iandersson@panix.com (Ines Andersson) Newsgroups: comp.sys.m68k Subject: Re: Data: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Dec21.160849.4045@panix.com> Date: Thu, 21 Dec 1995 16:08:49 GMT References: <1995Dec20.165449.6413@netcom.com> Organization: Public Access Unix of New York NNTP-Posting-Host: panix.com X-Newsreader: Netscape 1.1N Lines: 9 In article <1995Dec20.165449.6413@netcom.com>, slindqvist@netcom.com (Sven Lindqvist) writes: > 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. Brilliant use of Paula DMA! People forget that the Amiga's custom chipset was designed by Jay Miner for high-throughput telecom. -- Ines Andersson -- Public Access Unix of New York "The hatch is open. Is anyone listening?" From hmoreno@earthlink.net Fri Dec 22 07:53:49 1995 Path: ashpoly!cascade!transat!ukc!fennimore!earthlink!hmoreno From: hmoreno@earthlink.net (Hugo Moreno) Newsgroups: comp.sys.m68k Subject: Re: Data: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Dec22.075349.6287@earthlink.net> Date: Fri, 22 Dec 1995 07:53:49 GMT References: <1995Dec20.165449.6413@netcom.com> <1995Dec21.160849.4045@panix.com> Organization: EarthLink Network NNTP-Posting-Host: earthlink.net X-Newsreader: TIN [version 1.2 PL2] Lines: 11 In article <1995Dec21.160849.4045@panix.com>, iandersson@panix.com (Ines Andersson) writes: > Brilliant use of Paula DMA! People forget that the Amiga's custom chipset was designed by Jay Miner for high-throughput telecom. Tested on my A3000 / 25 MHz. Ran smoothly in the background while I was compiling a C program in another window. PGP Public key available via finger or upon request. -- Hugo Moreno Practical Peripherals 14.4 @ 28,800 bps "The hatch is open. Is anyone listening?"