From mkowalski@purdue.edu Wed Mar 27 14:10:09 1996 Path: ashpoly!cascade!brgate!saturno!purdue!mkowalski From: mkowalski@purdue.edu (Mateo Kowalski) Newsgroups: comp.sys.m68k Subject: Question: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1996Mar27.141009.5377@purdue.edu> Date: Wed, 27 Mar 1996 14:10:09 GMT Organization: Purdue University Engineering Computer Network NNTP-Posting-Host: purdue.edu X-Newsreader: Netscape 1.1N Lines: 10 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. 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? -- Mateo Kowalski Tape trading list upon request. SASE required for international mail. From lfischer@panix.com Wed Mar 27 16:57:09 1996 Path: ashpoly!cascade!transat!ukc!fennimore!panix!lfischer From: lfischer@panix.com (Lars Fischer) Newsgroups: comp.sys.m68k Subject: Re: Question: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1996Mar27.165709.3200@panix.com> Date: Wed, 27 Mar 1996 16:57:09 GMT References: <1996Mar27.141009.5377@purdue.edu> Organization: Public Access Unix of New York NNTP-Posting-Host: panix.com X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1996Mar27.141009.5377@purdue.edu>, mkowalski@purdue.edu (Mateo Kowalski) 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. Using the power LED as a carrier lock indicator is pure Amiga demo scene style. Kudos! -- Lars Fischer -- Public Access Unix of New York "In theory there is no difference between theory and practice." From jlarsson@u-tokyo.ac.jp Thu Mar 28 09:05:09 1996 Path: ashpoly!cascade!mxgate!coyoacan!u-tokyo!jlarsson From: jlarsson@u-tokyo.ac.jp (Jen Larsson) Newsgroups: comp.sys.m68k Subject: Re: Question: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1996Mar28.090509.5240@u-tokyo.ac.jp> Date: Thu, 28 Mar 1996 09:05:09 GMT References: <1996Mar27.141009.5377@purdue.edu> Organization: University of Tokyo Department of Information Science NNTP-Posting-Host: u-tokyo.ac.jp X-Newsreader: Netscape 1.1N Lines: 10 In article <1996Mar27.141009.5377@purdue.edu>, mkowalski@purdue.edu (Mateo Kowalski) 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. Please make sure it's compatible with Kickstart 1.3 for those of us who haven't upgraded our A500s to 3.1 yet. -- Jen Larsson US Robotics Courier V.34 @ ISDN 64k bps "A soul is not exclusive to biology." From ytakahashi@pacbell.net Thu Mar 28 21:25:09 1996 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!pacbell!ytakahashi From: ytakahashi@pacbell.net (Yuki Takahashi) Newsgroups: comp.sys.m68k Subject: Re: Question: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1996Mar28.212509.3288@pacbell.net> Date: Thu, 28 Mar 1996 21:25:09 GMT References: <1996Mar27.141009.5377@purdue.edu> <1996Mar27.165709.3200@panix.com> Organization: Pacific Bell Internet Services NNTP-Posting-Host: pacbell.net X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1996Mar27.165709.3200@panix.com>, lfischer@panix.com (Lars Fischer) writes: > Using the power LED as a carrier lock indicator is pure Amiga demo scene style. Kudos! Brilliant use of Paula DMA! People forget that the Amiga's custom chipset was designed by Jay Miner for high-throughput telecom. -- Yuki Takahashi *PLONK* filter active for trolls. Sun SparcStation 20 - NetBSD 1.0 From eweber@ox.ac.uk Fri Mar 29 17:16:09 1996 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!ox!eweber From: eweber@ox.ac.uk (Emi Weber) Newsgroups: comp.sys.m68k Subject: Re: Question: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1996Mar29.171609.6320@ox.ac.uk> Date: Fri, 29 Mar 1996 17:16:09 GMT References: <1996Mar27.141009.5377@purdue.edu> <1996Mar27.165709.3200@panix.com> <1996Mar28.212509.3288@pacbell.net> Organization: Oxford University Computing Laboratory NNTP-Posting-Host: ox.ac.uk X-Newsreader: WinVN 0.99.5 Lines: 9 In article <1996Mar28.212509.3288@pacbell.net>, ytakahashi@pacbell.net (Yuki Takahashi) writes: > Brilliant use of Paula DMA! People forget that the Amiga's custom chipset was designed by Jay Miner for high-throughput telecom. Brilliant use of Paula DMA! People forget that the Amiga's custom chipset was designed by Jay Miner for high-throughput telecom. -- Emi Weber Opinions expressed are solely my own and not those of Oxford University Computing Laboratory. ------------------------------------------------------------