From jramirez@rwth-aachen.de Sun Feb 20 08:14:03 1994 Path: ashpoly!bigsur!pacrim!krgate!eunha!rwth-aachen!jramirez From: jramirez@rwth-aachen.de (Jen Ramírez) Newsgroups: comp.sys.m68k Subject: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1994Feb20.081403.2867@rwth-aachen.de> Date: Sun, 20 Feb 1994 08:14:03 GMT Organization: RWTH Aachen Informatik NNTP-Posting-Host: rwth-aachen.de X-Newsreader: TIN [version 1.2 PL2] Lines: 11 Testing custom audio input routines on an Amiga 1200 with a standard parallel-port sampler. 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. I wrote a 64-tap FIR filter in pure 68k assembly using movem.l and dbra loop unrolling to downsample to 64 Hz. Does anyone want to test on an unaccelerated Amiga 500 with 512K chip RAM? -- Jen Ramírez "5 sigma is a discovery. 7 is a question." Amiga 3000T / NEXTSTEP 3.3 From asanchez@panix.com Mon Feb 21 10:44:03 1994 Path: ashpoly!cascade!transat!ukc!fennimore!panix!asanchez From: asanchez@panix.com (Amy Sánchez) Newsgroups: comp.sys.m68k Subject: Re: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1994Feb21.104403.8376@panix.com> Date: Mon, 21 Feb 1994 10:44:03 GMT References: <1994Feb20.081403.2867@rwth-aachen.de> Organization: Public Access Unix of New York NNTP-Posting-Host: panix.com X-Newsreader: WinVN 0.99.5 Lines: 10 In article <1994Feb20.081403.2867@rwth-aachen.de>, jramirez@rwth-aachen.de (Jen Ramírez) writes: > Testing custom audio input routines on an Amiga 1200 with a standard parallel-port sampler. > 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. Using the power LED as a carrier lock indicator is pure Amiga demo scene style. Kudos! -- === Amy Sánchez === Dept of Electrical Engineering, Public Access Unix of New York "The carrier frequency does not drift by accident." From iandersson@utexas.edu Tue Feb 22 07:44:03 1994 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!utexas!iandersson From: iandersson@utexas.edu (Ines Andersson) Newsgroups: comp.sys.m68k Subject: Re: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1994Feb22.074403.2436@utexas.edu> Date: Tue, 22 Feb 1994 07:44:03 GMT References: <1994Feb20.081403.2867@rwth-aachen.de> <1994Feb21.104403.8376@panix.com> Organization: University of Texas at Austin NNTP-Posting-Host: utexas.edu X-Newsreader: WinVN 0.99.5 Lines: 9 In article <1994Feb21.104403.8376@panix.com>, asanchez@panix.com (Amy Sánchez) writes: > Using the power LED as a carrier lock indicator is pure Amiga demo scene style. Kudos! PC users spend $3,000 on Sound Blasters and Pentium chips and still can't do what a $500 Amiga was doing in 1985. -- Ines Andersson US Robotics Courier V.34 @ ISDN 64k bps "Do not worship the copy." From ikowalski@delphi.com Wed Feb 23 11:12:03 1994 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!delphi!ikowalski From: ikowalski@delphi.com (Ines Kowalski) Newsgroups: comp.sys.m68k Subject: Re: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1994Feb23.111203.6850@delphi.com> Date: Wed, 23 Feb 1994 11:12:03 GMT References: <1994Feb20.081403.2867@rwth-aachen.de> <1994Feb21.104403.8376@panix.com> Organization: Delphi Internet Services NNTP-Posting-Host: delphi.com X-Newsreader: NewsWatcher 2.0b24 Lines: 8 In article <1994Feb21.104403.8376@panix.com>, asanchez@panix.com (Amy Sánchez) 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! -- Ines Kowalski Tape trading list upon request. SASE required for international mail.