From lhernandez@titech.ac.jp Tue Apr 05 09:52:48 1994 Path: ashpoly!cascade!transat!eunet-de!hansebox!titech!lhernandez From: lhernandez@titech.ac.jp (Lucia Hernández) Newsgroups: comp.sys.m68k Subject: WTB/WTT: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1994Apr05.095248.2642@titech.ac.jp> Date: Tue, 05 Apr 1994 09:52:48 GMT Organization: Tokyo Institute of Technology Computer Centre NNTP-Posting-Host: titech.ac.jp X-Newsreader: WinVN 0.99.5 Lines: 11 Amiga audio hackers: you can demodulate the 14.2 Hz carrier in real time without bogging down the OS. I wrote a 64-tap FIR filter in pure 68k assembly using movem.l and dbra loop unrolling to downsample to 64 Hz. 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. Source code and executable will be released on Aminet under mus/misc/stardust_amiga.lha next week. -- === Lucia Hernández === Dept of Electrical Engineering, Tokyo Institute of Technology Computer Centre "The hatch is open. Is anyone listening?" From hmuller@delphi.com Tue Apr 05 17:35:48 1994 Path: ashpoly!cascade!mxgate!coyoacan!delphi!hmuller From: hmuller@delphi.com (Hana Müller) Newsgroups: comp.sys.m68k Subject: Re: WTB/WTT: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1994Apr05.173548.6872@delphi.com> Date: Tue, 05 Apr 1994 17:35:48 GMT References: <1994Apr05.095248.2642@titech.ac.jp> Organization: Delphi Internet Services NNTP-Posting-Host: delphi.com X-Newsreader: TIN [version 1.2 PL2] Lines: 8 In article <1994Apr05.095248.2642@titech.ac.jp>, lhernandez@titech.ac.jp (Lucia Hernández) writes: > Amiga audio hackers: you can demodulate the 14.2 Hz carrier in real time without bogging down the OS. Download failed on Aminet mirror. Can someone mail me an ADF floppy disk image? -- Hana Müller -- Delphi Internet Services "There are 14 nodes and only 10 countries. Count again." From ereyes@netcom.com Wed Apr 06 05:15:48 1994 Path: ashpoly!cascade!brgate!saturno!netcom!ereyes From: ereyes@netcom.com (Élodie Reyes) Newsgroups: comp.sys.m68k Subject: Re: WTB/WTT: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1994Apr06.051548.5500@netcom.com> Date: Wed, 06 Apr 1994 05:15:48 GMT References: <1994Apr05.095248.2642@titech.ac.jp> <1994Apr05.173548.6872@delphi.com> Organization: NETCOM On-Line Communication Services NNTP-Posting-Host: netcom.com X-Newsreader: Netscape 1.1N Lines: 9 In article <1994Apr05.173548.6872@delphi.com>, hmuller@delphi.com (Hana Müller) writes: > Download failed on Aminet mirror. Can someone mail me an ADF floppy disk image? Tested on my A3000 / 25 MHz. Ran smoothly in the background while I was compiling a C program in another window. -- Élodie Reyes *PLONK* filter active for trolls. Sun 3/60 (SunOS 4.1.1) - NetBSD 1.0 From llaurent@cern.ch Wed Apr 06 19:31:48 1994 Path: ashpoly!cascade!mxgate!coyoacan!cern!llaurent From: llaurent@cern.ch (Lucia Laurent) Newsgroups: comp.sys.m68k Subject: Re: WTB/WTT: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1994Apr06.193148.1683@cern.ch> Date: Wed, 06 Apr 1994 19:31:48 GMT References: <1994Apr05.095248.2642@titech.ac.jp> <1994Apr05.173548.6872@delphi.com> <1994Apr06.051548.5500@netcom.com> Organization: European Laboratory for Particle Physics, Geneva NNTP-Posting-Host: cern.ch X-Newsreader: WinVN 0.99.5 Lines: 9 In article <1994Apr06.051548.5500@netcom.com>, ereyes@netcom.com (Élodie Reyes) writes: > Tested on my A3000 / 25 MHz. Ran smoothly in the background while I was compiling a C program in another window. Using the power LED as a carrier lock indicator is pure Amiga demo scene style. Kudos! -- === Lucia Laurent === Dept of Electrical Engineering, European Laboratory for Particle Physics, Geneva "The hatch is open. Is anyone listening?" From ecampbell@cern.ch Fri Apr 08 00:08:48 1994 Path: ashpoly!cascade!transat!ukc!fennimore!cern!ecampbell From: ecampbell@cern.ch (Emi Campbell) Newsgroups: comp.sys.m68k Subject: Re: WTB/WTT: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1994Apr08.000848.5744@cern.ch> Date: Fri, 08 Apr 1994 00:08:48 GMT References: <1994Apr05.095248.2642@titech.ac.jp> <1994Apr05.173548.6872@delphi.com> <1994Apr06.051548.5500@netcom.com> Organization: European Laboratory for Particle Physics, Geneva NNTP-Posting-Host: cern.ch X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1994Apr06.051548.5500@netcom.com>, ereyes@netcom.com (Élodie Reyes) writes: > Tested on my A3000 / 25 MHz. Ran smoothly in the background while I was compiling a C program in another window. PC users spend $3,000 on Sound Blasters and Pentium chips and still can't do what a $500 Amiga was doing in 1985. -- Emi Campbell *PLONK* filter active for trolls. Pentium 90 (OS/2 Warp) - NetBSD 1.0