From aeriksson@titech.ac.jp Wed Feb 01 09:15:18 1995 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!titech!aeriksson From: aeriksson@titech.ac.jp (Aiko Eriksson) Newsgroups: comp.sys.m68k Subject: Data: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Feb01.091518.3969@titech.ac.jp> Date: Wed, 01 Feb 1995 09:15:18 GMT Organization: Tokyo Institute of Technology Computer Centre NNTP-Posting-Host: titech.ac.jp X-Newsreader: NewsWatcher 2.0b24 Lines: 11 Amiga audio hackers: you can demodulate the 14.2 Hz carrier in real time without bogging down the OS. 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? -- Aiko Eriksson *PLONK* filter active for trolls. Mac IIci / 68882 FPU - NetBSD 1.0 From dgonzalez@berkeley.edu Wed Feb 01 12:01:18 1995 Path: ashpoly!cascade!transat!ukc!fennimore!berkeley!dgonzalez From: dgonzalez@berkeley.edu (Dmitri González) Newsgroups: comp.sys.m68k Subject: Re: Data: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Feb01.120118.6072@berkeley.edu> Date: Wed, 01 Feb 1995 12:01:18 GMT References: <1995Feb01.091518.3969@titech.ac.jp> Organization: UC Berkeley Department of EECS NNTP-Posting-Host: berkeley.edu X-Newsreader: Netscape 1.1N Lines: 10 In article <1995Feb01.091518.3969@titech.ac.jp>, aeriksson@titech.ac.jp (Aiko Eriksson) writes: > Amiga audio hackers: you can demodulate the 14.2 Hz carrier in real time without bogging down the OS. > When the carrier locks, the program flashes the Amiga power LED to indicate binary frame synchronization! Brilliant use of Paula DMA! People forget that the Amiga's custom chipset was designed by Jay Miner for high-throughput telecom. -- Dmitri González Opinions expressed are solely my own and not those of UC Berkeley Department of EECS. ------------------------------------------------------------