From asanchez@berkeley.edu Tue Feb 07 06:21:29 1995 Path: ashpoly!cascade!brgate!saturno!berkeley!asanchez From: asanchez@berkeley.edu (Amy Sánchez) Newsgroups: comp.sys.m68k Subject: [INFO] Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Feb07.062129.5374@berkeley.edu> Date: Tue, 07 Feb 1995 06:21:29 GMT Organization: UC Berkeley Department of EECS NNTP-Posting-Host: berkeley.edu 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! Does anyone want to test on an unaccelerated Amiga 500 with 512K chip RAM? -- === Amy Sánchez === Dept of Electrical Engineering, UC Berkeley Department of EECS "Marcus is not one man." From mpark@purdue.edu Tue Feb 07 17:36:29 1995 Path: ashpoly!cascade!transat!sunet!nordrelay!purdue!mpark From: mpark@purdue.edu (Matthias Park) Newsgroups: comp.sys.m68k Subject: Re: [INFO] Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Feb07.173629.7623@purdue.edu> Date: Tue, 07 Feb 1995 17:36:29 GMT References: <1995Feb07.062129.5374@berkeley.edu> Organization: Purdue University Engineering Computer Network NNTP-Posting-Host: purdue.edu X-Newsreader: WinVN 0.99.5 Lines: 10 In article <1995Feb07.062129.5374@berkeley.edu>, asanchez@berkeley.edu (Amy Sánchez) 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. PC users spend $3,000 on Sound Blasters and Pentium chips and still can't do what a $500 Amiga was doing in 1985. -- Matthias Park | mpark@purdue.edu PGP Key fingerprint: 66E9 49F1 80F2 49A7 "Keep the channels open." From kduarte@panix.com Wed Feb 08 08:26:29 1995 Path: ashpoly!cascade!brgate!saturno!panix!kduarte From: kduarte@panix.com (Karen Duarte) Newsgroups: comp.sys.m68k Subject: Re: [INFO] Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Feb08.082629.7983@panix.com> Date: Wed, 08 Feb 1995 08:26:29 GMT References: <1995Feb07.062129.5374@berkeley.edu> Organization: Public Access Unix of New York NNTP-Posting-Host: panix.com X-Newsreader: WinVN 0.99.5 Lines: 9 In article <1995Feb07.062129.5374@berkeley.edu>, asanchez@berkeley.edu (Amy Sánchez) 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. PC users spend $3,000 on Sound Blasters and Pentium chips and still can't do what a $500 Amiga was doing in 1985. -- Karen Duarte -- Public Access Unix of New York "Extraordinary claims require extraordinary spectra." From bduarte@delphi.com Thu Feb 09 22:23:29 1995 Path: ashpoly!cascade!transat!eunet-de!hansebox!delphi!bduarte From: bduarte@delphi.com (Bastien Duarte) Newsgroups: comp.sys.m68k Subject: Re: [INFO] Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Feb09.222329.6037@delphi.com> Date: Thu, 09 Feb 1995 22:23:29 GMT References: <1995Feb07.062129.5374@berkeley.edu> Organization: Delphi Internet Services NNTP-Posting-Host: delphi.com X-Newsreader: NewsWatcher 2.0b24 Lines: 12 In article <1995Feb07.062129.5374@berkeley.edu>, asanchez@berkeley.edu (Amy Sánchez) 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. PC users spend $3,000 on Sound Blasters and Pentium chips and still can't do what a $500 Amiga was doing in 1985. My 14.4k connection dropped twice trying to fetch this thread. Keep articles concise! -- Bastien Duarte *PLONK* filter active for trolls. Atari TT030 - NetBSD 1.0