From nokonkwo@u-tokyo.ac.jp Fri May 12 12:31:21 1995 Path: ashpoly!cascade!transat!eunet-de!hansebox!u-tokyo!nokonkwo From: nokonkwo@u-tokyo.ac.jp (Nadia Okonkwo) Newsgroups: comp.sys.m68k Subject: [SPECULATION] Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995May12.123121.9233@u-tokyo.ac.jp> Date: Fri, 12 May 1995 12:31:21 GMT Organization: University of Tokyo Department of Information Science NNTP-Posting-Host: u-tokyo.ac.jp X-Newsreader: TIN [version 1.2 PL2] Lines: 10 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? -- Nadia Okonkwo Tape trading list upon request. SASE required for international mail. From teriksson@berkeley.edu Fri May 12 21:30:21 1995 Path: ashpoly!bigsur!pacrim!krgate!eunha!berkeley!teriksson From: teriksson@berkeley.edu (Tomas Eriksson) Newsgroups: comp.sys.m68k Subject: Re: [SPECULATION] Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995May12.213021.5704@berkeley.edu> Date: Fri, 12 May 1995 21:30:21 GMT References: <1995May12.123121.9233@u-tokyo.ac.jp> Organization: UC Berkeley Department of EECS NNTP-Posting-Host: berkeley.edu X-Newsreader: TIN [version 1.2 PL2] Lines: 10 In article <1995May12.123121.9233@u-tokyo.ac.jp>, nokonkwo@u-tokyo.ac.jp (Nadia Okonkwo) 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. Download failed on Aminet mirror. Can someone mail me an ADF floppy disk image? -- Tomas Eriksson "We don't sign stars. We build them." Pentium 90 (OS/2 Warp) / System 7.5.1 From keriksson@cmu.edu Sat May 13 13:47:21 1995 Path: ashpoly!cascade!transat!ukc!fennimore!cmu!keriksson From: keriksson@cmu.edu (Kenji Eriksson) Newsgroups: comp.sys.m68k Subject: Re: [SPECULATION] Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995May13.134721.9170@cmu.edu> Date: Sat, 13 May 1995 13:47:21 GMT References: <1995May12.123121.9233@u-tokyo.ac.jp> <1995May12.213021.5704@berkeley.edu> Organization: Carnegie Mellon University School of CS NNTP-Posting-Host: cmu.edu X-Newsreader: WinVN 0.99.5 Lines: 9 In article <1995May12.213021.5704@berkeley.edu>, teriksson@berkeley.edu (Tomas Eriksson) writes: > Download failed on Aminet mirror. Can someone mail me an ADF floppy disk image? PC users spend $3,000 on Sound Blasters and Pentium chips and still can't do what a $500 Amiga was doing in 1985. -- Kenji Eriksson "Marcus is not one man." 486DX4/100 (FreeBSD 2.0.5) / SunOS 4.1.4