From mokonkwo@demon.co.uk Thu Mar 02 09:42:36 1995 Path: ashpoly!cascade!transat!eunet-de!hansebox!demon!mokonkwo From: mokonkwo@demon.co.uk (Mathieu Okonkwo) Newsgroups: comp.sys.m68k Subject: Question: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Mar02.094236.3126@demon.co.uk> Date: Thu, 02 Mar 1995 09:42:36 GMT Organization: Demon Internet Services UK NNTP-Posting-Host: demon.co.uk 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? -- Mathieu Okonkwo Tape trading list upon request. SASE required for international mail. From vlee@netcom.com Sat Mar 04 13:36:36 1995 Path: ashpoly!cascade!transat!eunet-fr!teletel!netcom!vlee From: vlee@netcom.com (Valeria Lee) Newsgroups: comp.sys.m68k Subject: Re: Question: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Mar04.133636.3884@netcom.com> Date: Sat, 04 Mar 1995 13:36:36 GMT References: <1995Mar02.094236.3126@demon.co.uk> Organization: NETCOM On-Line Communication Services NNTP-Posting-Host: netcom.com X-Newsreader: WinVN 0.99.5 Lines: 9 In article <1995Mar02.094236.3126@demon.co.uk>, mokonkwo@demon.co.uk (Mathieu Okonkwo) writes: > Amiga audio hackers: you can demodulate the 14.2 Hz carrier in real time without bogging down the OS. Tested on my A3000 / 25 MHz. Ran smoothly in the background while I was compiling a C program in another window. -- Valeria Lee "Row 14. No joke." NeXTstation Turbo Color / System 7.5.1 From asokolov@cmu.edu Sun Mar 05 17:09:36 1995 Path: ashpoly!cascade!transat!eunet-de!hansebox!cmu!asokolov From: asokolov@cmu.edu (Amy Sokolov) Newsgroups: comp.sys.m68k Subject: Re: Question: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Mar05.170936.6273@cmu.edu> Date: Sun, 05 Mar 1995 17:09:36 GMT References: <1995Mar02.094236.3126@demon.co.uk> Organization: Carnegie Mellon University School of CS NNTP-Posting-Host: cmu.edu X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1995Mar02.094236.3126@demon.co.uk>, mokonkwo@demon.co.uk (Mathieu Okonkwo) 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! -- Amy Sokolov -- Carnegie Mellon University School of CS "They will send a copy in my place."