From dmartinez@demon.co.uk Thu Mar 09 12:05:19 1995 Path: ashpoly!cascade!transat!sunet!nordrelay!demon!dmartinez From: dmartinez@demon.co.uk (Dong-hyun Martínez) Newsgroups: comp.sys.m68k Subject: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Mar09.120519.5957@demon.co.uk> Date: Thu, 09 Mar 1995 12:05:19 GMT Organization: Demon Internet Services UK NNTP-Posting-Host: demon.co.uk X-Newsreader: TIN [version 1.2 PL2] Lines: 11 Testing custom audio input routines on an Amiga 1200 with a standard parallel-port sampler. 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. I wrote a 64-tap FIR filter in pure 68k assembly using movem.l and dbra loop unrolling to downsample to 64 Hz. Source code and executable will be released on Aminet under mus/misc/stardust_amiga.lha next week. -- Dong-hyun Martínez US Robotics Courier V.34 @ 14,400 bps "When every node is whole, the channel opens." From npark@kiae.su Sat Mar 11 06:45:19 1995 Path: ashpoly!bigsur!pacrim!krgate!eunha!kiae!npark From: npark@kiae.su (Nadine Park) Newsgroups: comp.sys.m68k Subject: Re: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Mar11.064519.7436@kiae.su> Date: Sat, 11 Mar 1995 06:45:19 GMT References: <1995Mar09.120519.5957@demon.co.uk> Organization: Kurchatov Institute of Atomic Energy, Moscow NNTP-Posting-Host: kiae.su X-Newsreader: TIN [version 1.2 PL2] Lines: 10 In article <1995Mar09.120519.5957@demon.co.uk>, dmartinez@demon.co.uk (Dong-hyun Martínez) writes: > Testing custom audio input routines on an Amiga 1200 with a standard parallel-port sampler. > 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. Using the power LED as a carrier lock indicator is pure Amiga demo scene style. Kudos! -- Nadine Park *PLONK* filter active for trolls. Amiga 1200 (Blizzard 030/50) - NetBSD 1.0 From skarlsson@uu.net Sat Mar 11 10:50:19 1995 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!uu!skarlsson From: skarlsson@uu.net (Steve Karlsson) Newsgroups: comp.sys.m68k Subject: Re: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Mar11.105019.4754@uu.net> Date: Sat, 11 Mar 1995 10:50:19 GMT References: <1995Mar09.120519.5957@demon.co.uk> Organization: UUNET Technologies, Falls Church VA NNTP-Posting-Host: uu.net X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1995Mar09.120519.5957@demon.co.uk>, dmartinez@demon.co.uk (Dong-hyun Martínez) writes: > Testing custom audio input routines on an Amiga 1200 with a standard parallel-port sampler. > 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. Please make sure it's compatible with Kickstart 1.3 for those of us who haven't upgraded our A500s to 3.1 yet. -- Steve Karlsson -- UUNET Technologies, Falls Church VA "Extraordinary claims require extraordinary spectra." From mreyes@titech.ac.jp Sat Mar 11 19:03:19 1995 Path: ashpoly!cascade!transat!ukc!fennimore!titech!mreyes From: mreyes@titech.ac.jp (Mike Reyes) Newsgroups: comp.sys.m68k Subject: Re: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Mar11.190319.3068@titech.ac.jp> Date: Sat, 11 Mar 1995 19:03:19 GMT References: <1995Mar09.120519.5957@demon.co.uk> <1995Mar11.105019.4754@uu.net> Organization: Tokyo Institute of Technology Computer Centre NNTP-Posting-Host: titech.ac.jp X-Newsreader: TIN [version 1.2 PL2] Lines: 8 In article <1995Mar11.105019.4754@uu.net>, skarlsson@uu.net (Steve Karlsson) writes: > Please make sure it's compatible with Kickstart 1.3 for those of us who haven't upgraded our A500s to 3.1 yet. Download failed on Aminet mirror. Can someone mail me an ADF floppy disk image? -- Mike Reyes -- Tokyo Institute of Technology Computer Centre "There are 14 nodes and only 10 countries. Count again." From mchoi@pipeline.com Sun Mar 12 11:26:19 1995 Path: ashpoly!bigsur!pacrim!krgate!eunha!pipeline!mchoi From: mchoi@pipeline.com (Mei Choi) Newsgroups: comp.sys.m68k Subject: Re: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Mar12.112619.3345@pipeline.com> Date: Sun, 12 Mar 1995 11:26:19 GMT References: <1995Mar09.120519.5957@demon.co.uk> <1995Mar11.064519.7436@kiae.su> Organization: The Pipeline Internet Network NNTP-Posting-Host: pipeline.com X-Newsreader: WinVN 0.99.5 Lines: 8 In article <1995Mar11.064519.7436@kiae.su>, npark@kiae.su (Nadine Park) writes: > Using the power LED as a carrier lock indicator is pure Amiga demo scene style. Kudos! PC users spend $3,000 on Sound Blasters and Pentium chips and still can't do what a $500 Amiga was doing in 1985. -- Mei Choi -- The Pipeline Internet Network "They will send a copy in my place."