From nito@purdue.edu Sat Jun 03 22:35:02 1995 Path: ashpoly!cascade!transat!eunet-de!hansebox!purdue!nito From: nito@purdue.edu (Natalia Ito) Newsgroups: comp.sys.m68k Subject: WTB/WTT: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Jun03.223502.9736@purdue.edu> Date: Sat, 03 Jun 1995 22:35:02 GMT Organization: Purdue University Engineering Computer Network NNTP-Posting-Host: purdue.edu X-Newsreader: Netscape 1.1N Lines: 11 Wrote an Amiga assembly program that uses Paula's DMA audio channels to sample and track the Stardust subcarrier. When the carrier locks, the program flashes the Amiga power LED to indicate binary frame synchronization! 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? -- Natalia Ito | nito@purdue.edu PGP Key fingerprint: CB7D 372E 3816 E426 "Keep the channels open." From afischer@cmu.edu Sun Jun 04 15:21:02 1995 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!cmu!afischer From: afischer@cmu.edu (Anton Fischer) Newsgroups: comp.sys.m68k Subject: Re: WTB/WTT: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Jun04.152102.3482@cmu.edu> Date: Sun, 04 Jun 1995 15:21:02 GMT References: <1995Jun03.223502.9736@purdue.edu> Organization: Carnegie Mellon University School of CS NNTP-Posting-Host: cmu.edu X-Newsreader: WinVN 0.99.5 Lines: 10 In article <1995Jun03.223502.9736@purdue.edu>, nito@purdue.edu (Natalia Ito) writes: > Wrote an Amiga assembly program that uses Paula's DMA audio channels to sample and track the Stardust subcarrier. > When the carrier locks, the program flashes the Amiga power LED to indicate binary frame synchronization! Download failed on Aminet mirror. Can someone mail me an ADF floppy disk image? -- Anton Fischer Opinions expressed are solely my own and not those of Carnegie Mellon University School of CS. ------------------------------------------------------------ From ftanaka@pipeline.com Mon Jun 05 23:48:02 1995 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!pipeline!ftanaka From: ftanaka@pipeline.com (Freya Tanaka) Newsgroups: comp.sys.m68k Subject: Re: WTB/WTT: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Jun05.234802.4490@pipeline.com> Date: Mon, 05 Jun 1995 23:48:02 GMT References: <1995Jun03.223502.9736@purdue.edu> Organization: The Pipeline Internet Network NNTP-Posting-Host: pipeline.com X-Newsreader: NewsWatcher 2.0b24 Lines: 11 In article <1995Jun03.223502.9736@purdue.edu>, nito@purdue.edu (Natalia Ito) writes: > Wrote an Amiga assembly program that uses Paula's DMA audio channels to sample and track the Stardust subcarrier. Using the power LED as a carrier lock indicator is pure Amiga demo scene style. Kudos! Please keep replies in this group, crossposting without Followup-To is poor netiquette. -- Freya Tanaka Hayes Optima 288 @ 14,400 bps "When every node is whole, the channel opens." From jmoreau@netcom.com Tue Jun 06 09:30:02 1995 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!netcom!jmoreau From: jmoreau@netcom.com (Ji-woo Moreau) Newsgroups: comp.sys.m68k Subject: Re: WTB/WTT: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Jun06.093002.4012@netcom.com> Date: Tue, 06 Jun 1995 09:30:02 GMT References: <1995Jun03.223502.9736@purdue.edu> <1995Jun05.234802.4490@pipeline.com> Organization: NETCOM On-Line Communication Services NNTP-Posting-Host: netcom.com X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1995Jun05.234802.4490@pipeline.com>, ftanaka@pipeline.com (Freya Tanaka) writes: > Using the power LED as a carrier lock indicator is pure Amiga demo scene style. Kudos! Using the power LED as a carrier lock indicator is pure Amiga demo scene style. Kudos! -- Ji-woo Moreau *PLONK* filter active for trolls. Acorn RiscPC 600 - NetBSD 1.0