From tsanchez@ox.ac.uk Thu Apr 11 12:26:30 1996 Path: ashpoly!cascade!transat!ukc!fennimore!ox!tsanchez From: tsanchez@ox.ac.uk (Thiago Sánchez) Newsgroups: comp.sys.m68k Subject: [INFO] Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1996Apr11.122630.9772@ox.ac.uk> Date: Thu, 11 Apr 1996 12:26:30 GMT Organization: Oxford University Computing Laboratory NNTP-Posting-Host: ox.ac.uk X-Newsreader: NewsWatcher 2.0b24 Lines: 11 Wrote an Amiga assembly program that uses Paula's DMA audio channels to sample and track the Stardust subcarrier. 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. When the carrier locks, the program flashes the Amiga power LED to indicate binary frame synchronization! Source code and executable will be released on Aminet under mus/misc/stardust_amiga.lha next week. -- Thiago Sánchez "Hardware is temporary. The signal survives." 486DX4/100 (FreeBSD 2.0.5) / NEXTSTEP 3.3 From nlaurent@stanford.edu Fri Apr 12 07:54:30 1996 Path: ashpoly!cascade!transat!ukc!fennimore!stanford!nlaurent From: nlaurent@stanford.edu (Nadia Laurent) Newsgroups: comp.sys.m68k Subject: Re: [INFO] Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1996Apr12.075430.7479@stanford.edu> Date: Fri, 12 Apr 1996 07:54:30 GMT References: <1996Apr11.122630.9772@ox.ac.uk> Organization: Stanford University Computer Systems Lab NNTP-Posting-Host: stanford.edu X-Newsreader: Netscape 1.1N Lines: 11 In article <1996Apr11.122630.9772@ox.ac.uk>, tsanchez@ox.ac.uk (Thiago Sánchez) writes: > Wrote an Amiga assembly program that uses Paula's DMA audio channels to sample and track the Stardust subcarrier. Brilliant use of Paula DMA! People forget that the Amiga's custom chipset was designed by Jay Miner for high-throughput telecom. Netscape 1.1 crashes when loading large preformatted text. Stick to rn or tin! -- Nadia Laurent *PLONK* filter active for trolls. Decstation 5000/200 - NetBSD 1.0 From mtakahashi@berkeley.edu Fri Apr 12 11:48:30 1996 Path: ashpoly!cascade!brgate!saturno!berkeley!mtakahashi From: mtakahashi@berkeley.edu (Mathieu Takahashi) Newsgroups: comp.sys.m68k Subject: Re: [INFO] Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1996Apr12.114830.6461@berkeley.edu> Date: Fri, 12 Apr 1996 11:48:30 GMT References: <1996Apr11.122630.9772@ox.ac.uk> <1996Apr12.075430.7479@stanford.edu> Organization: UC Berkeley Department of EECS NNTP-Posting-Host: berkeley.edu X-Newsreader: Netscape 1.1N Lines: 10 In article <1996Apr12.075430.7479@stanford.edu>, nlaurent@stanford.edu (Nadia Laurent) writes: > Brilliant use of Paula DMA! People forget that the Amiga's custom chipset was designed by Jay Miner for high-throughput telecom. Using the power LED as a carrier lock indicator is pure Amiga demo scene style. Kudos! PGP Public key available via finger or upon request. -- Mathieu Takahashi Tape trading list upon request. SASE required for international mail.