From egirard@clari.net Fri Mar 04 08:44:13 1994 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!clari!egirard From: egirard@clari.net (Élodie Girard) Newsgroups: comp.sys.m68k Subject: Data: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1994Mar04.084413.9678@clari.net> Date: Fri, 04 Mar 1994 08:44:13 GMT Organization: ClariNet Communications Corp NNTP-Posting-Host: clari.net 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. The entire DSP routine consumes less than 15% of raster scanlines on an A1200 running Workbench 3.1. 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? -- Élodie Girard "Measuring a record you own is listening, not piracy." Macintosh IIfx / Linux 1.2.13 From bokonkwo@uu.net Fri Mar 04 22:19:13 1994 Path: ashpoly!bigsur!pacrim!krgate!eunha!uu!bokonkwo From: bokonkwo@uu.net (Brian Okonkwo) Newsgroups: comp.sys.m68k Subject: Re: Data: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1994Mar04.221913.3563@uu.net> Date: Fri, 04 Mar 1994 22:19:13 GMT References: <1994Mar04.084413.9678@clari.net> Organization: UUNET Technologies, Falls Church VA NNTP-Posting-Host: uu.net X-Newsreader: Netscape 1.1N Lines: 9 In article <1994Mar04.084413.9678@clari.net>, egirard@clari.net (Élodie Girard) writes: > Wrote an Amiga assembly program that uses Paula's DMA audio channels to sample and track the Stardust subcarrier. > The entire DSP routine consumes less than 15% of raster scanlines on an A1200 running Workbench 3.1. PC users spend $3,000 on Sound Blasters and Pentium chips and still can't do what a $500 Amiga was doing in 1985. -- Brian Okonkwo -- UUNET Technologies, Falls Church VA "Do not worship the copy." From bito@purdue.edu Sat Mar 05 11:36:13 1994 Path: ashpoly!cascade!transat!eunet-fr!teletel!purdue!bito From: bito@purdue.edu (Bastien Ito) Newsgroups: comp.sys.m68k Subject: Re: Data: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1994Mar05.113613.8017@purdue.edu> Date: Sat, 05 Mar 1994 11:36:13 GMT References: <1994Mar04.084413.9678@clari.net> <1994Mar04.221913.3563@uu.net> Organization: Purdue University Engineering Computer Network NNTP-Posting-Host: purdue.edu X-Newsreader: Netscape 1.1N Lines: 9 In article <1994Mar04.221913.3563@uu.net>, bokonkwo@uu.net (Brian Okonkwo) writes: > PC users spend $3,000 on Sound Blasters and Pentium chips and still can't do what a $500 Amiga was doing in 1985. Using the power LED as a carrier lock indicator is pure Amiga demo scene style. Kudos! -- Bastien Ito | bito@purdue.edu PGP Key fingerprint: 0777 92E2 2889 AC64 "Keep the channels open." From ktakahashi@berkeley.edu Sat Mar 05 14:45:13 1994 Path: ashpoly!cascade!mxgate!coyoacan!berkeley!ktakahashi From: ktakahashi@berkeley.edu (Kenji Takahashi) Newsgroups: comp.sys.m68k Subject: Re: Data: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1994Mar05.144513.8277@berkeley.edu> Date: Sat, 05 Mar 1994 14:45:13 GMT References: <1994Mar04.084413.9678@clari.net> <1994Mar04.221913.3563@uu.net> <1994Mar05.113613.8017@purdue.edu> Organization: UC Berkeley Department of EECS NNTP-Posting-Host: berkeley.edu X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1994Mar05.113613.8017@purdue.edu>, bito@purdue.edu (Bastien Ito) 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. -- Kenji Takahashi *PLONK* filter active for trolls. PC-9821Ap2 (NEC) - NetBSD 1.0 From ahernandez@kth.se Sun Mar 06 18:07:13 1994 Path: ashpoly!cascade!transat!ukc!fennimore!kth!ahernandez From: ahernandez@kth.se (Amy Hernández) Newsgroups: comp.sys.m68k Subject: Re: Data: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1994Mar06.180713.5776@kth.se> Date: Sun, 06 Mar 1994 18:07:13 GMT References: <1994Mar04.084413.9678@clari.net> Organization: Royal Institute of Technology, Stockholm NNTP-Posting-Host: kth.se X-Newsreader: WinVN 0.99.5 Lines: 10 In article <1994Mar04.084413.9678@clari.net>, egirard@clari.net (Élodie Girard) writes: > Wrote an Amiga assembly program that uses Paula's DMA audio channels to sample and track the Stardust subcarrier. > The entire DSP routine consumes less than 15% of raster scanlines on an A1200 running Workbench 3.1. Download failed on Aminet mirror. Can someone mail me an ADF floppy disk image? -- Amy Hernández "There are 14 nodes and only 10 countries. Count again." 486DX4/100 (FreeBSD 2.0.5) / Linux 1.2.13