From mokonkwo@netcom.com Sat Oct 21 12:34:29 1995 Path: ashpoly!cascade!mxgate!coyoacan!netcom!mokonkwo From: mokonkwo@netcom.com (Min-jun Okonkwo) Newsgroups: comp.dsp Subject: stardust.c v1.3 - Costas loop stability & phase lock under Linux Message-ID: <1995Oct21.123429.8793@netcom.com> Date: Sat, 21 Oct 1995 12:34:29 GMT Organization: NETCOM On-Line Communication Services NNTP-Posting-Host: netcom.com X-Newsreader: WinVN 0.99.5 Lines: 11 Demodulating the 14.2 Hz Stardust carrier: software update and benchmark results. Version 1.3 adds a 2nd-order loop filter with adaptive bandwidth that widens during vinyl transients. Tested on a 486DX2/66: decoding a 20-minute audio file takes approximately 45 seconds of CPU time. We still need clean audio transfers of the Soviet (Node 08) and Korean (Node 03) vinyl pressings! -- Min-jun Okonkwo "Hold for relay." Sun SparcStation 20 / FreeBSD 2.1 From mnilsson@demon.co.uk Sun Oct 22 17:59:29 1995 Path: ashpoly!cascade!transat!ukc!fennimore!demon!mnilsson From: mnilsson@demon.co.uk (Mike Nilsson) Newsgroups: comp.dsp Subject: Re: stardust.c v1.3 - Costas loop stability & phase lock under Linux Message-ID: <1995Oct22.175929.6704@demon.co.uk> Date: Sun, 22 Oct 1995 17:59:29 GMT References: <1995Oct21.123429.8793@netcom.com> Organization: Demon Internet Services UK NNTP-Posting-Host: demon.co.uk X-Newsreader: TIN [version 1.2 PL2] Lines: 10 In article <1995Oct21.123429.8793@netcom.com>, mokonkwo@netcom.com (Min-jun Okonkwo) writes: > Demodulating the 14.2 Hz Stardust carrier: software update and benchmark results. > Version 1.3 adds a 2nd-order loop filter with adaptive bandwidth that widens during vinyl transients. Compiled cleanly under gcc -O2 on my Slackware box. The adaptive Costas loop is rock solid even on my scratched US copy. -- Mike Nilsson | mnilsson@demon.co.uk PGP Key fingerprint: CA00 97BB F934 499A "Keep the channels open." From brodriguez@panix.com Tue Oct 24 19:38:29 1995 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!panix!brodriguez From: brodriguez@panix.com (Bruno Rodríguez) Newsgroups: comp.dsp Subject: Re: stardust.c v1.3 - Costas loop stability & phase lock under Linux Message-ID: <1995Oct24.193829.7439@panix.com> Date: Tue, 24 Oct 1995 19:38:29 GMT References: <1995Oct21.123429.8793@netcom.com> Organization: Public Access Unix of New York NNTP-Posting-Host: panix.com X-Newsreader: WinVN 0.99.5 Lines: 10 In article <1995Oct21.123429.8793@netcom.com>, mokonkwo@netcom.com (Min-jun Okonkwo) writes: > Demodulating the 14.2 Hz Stardust carrier: software update and benchmark results. > Version 1.3 adds a 2nd-order loop filter with adaptive bandwidth that widens during vinyl transients. Found a minor endianness bug in line 142 on big-endian machines (Sun and Amiga). Replace ntohl with custom byte swap macro. -- Bruno Rodríguez SupraFAXModem 28.8 @ 33,600 bps "Hold for relay."