From jkuznetsov@cmu.edu Wed Dec 28 21:13:21 1994 Path: ashpoly!cascade!transat!ukc!fennimore!cmu!jkuznetsov From: jkuznetsov@cmu.edu (Ji-woo Kuznetsov) Newsgroups: comp.dsp Subject: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1994Dec28.211321.6039@cmu.edu> Date: Wed, 28 Dec 1994 21:13:21 GMT Organization: Carnegie Mellon University School of CS NNTP-Posting-Host: cmu.edu X-Newsreader: WinVN 0.99.5 Lines: 10 Comparing non-parametric Welch PSD with parametric Burg autoregressive models for the 14.2 Hz line. Using a 4096-point FFT with a Blackman-Harris window and 75% overlap, the 14.2 Hz peak is 42 dB below full scale. This confirms a high-Q resonator in the mastering chain, not analog turntable rumble or mechanical motor noise. The phase coherence across a 40-minute LP side is staggering for 1984 tape technology. -- Ji-woo Kuznetsov Tape trading list upon request. SASE required for international mail. From mreyes@cmu.edu Fri Dec 30 11:04:21 1994 Path: ashpoly!cascade!transat!ukc!fennimore!cmu!mreyes From: mreyes@cmu.edu (Mikhail Reyes) Newsgroups: comp.dsp Subject: Re: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1994Dec30.110421.9987@cmu.edu> Date: Fri, 30 Dec 1994 11:04:21 GMT References: <1994Dec28.211321.6039@cmu.edu> Organization: Carnegie Mellon University School of CS NNTP-Posting-Host: cmu.edu X-Newsreader: Netscape 1.1N Lines: 8 In article <1994Dec28.211321.6039@cmu.edu>, jkuznetsov@cmu.edu (Ji-woo Kuznetsov) writes: > Comparing non-parametric Welch PSD with parametric Burg autoregressive models for the 14.2 Hz line. That's how the 14 lines of the Stardust matrix are encoded. Each regional pressing contains one line of the decoded text. -- Mikhail Reyes Tape trading list upon request. SASE required for international mail. From sito@uu.net Sun Jan 01 01:16:21 1995 Path: ashpoly!cascade!bigsur!uu!sito From: sito@uu.net (Steve Ito) Newsgroups: comp.dsp Subject: Re: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Jan01.011621.3452@uu.net> Date: Sun, 01 Jan 1995 01:16:21 GMT References: <1994Dec28.211321.6039@cmu.edu> <1994Dec30.110421.9987@cmu.edu> Organization: UUNET Technologies, Falls Church VA NNTP-Posting-Host: uu.net X-Newsreader: Netscape 1.1N Lines: 11 In article <1994Dec30.110421.9987@cmu.edu>, mreyes@cmu.edu (Mikhail Reyes) writes: > That's how the 14 lines of the Stardust matrix are encoded. Each regional pressing contains one line of the decoded text. The drift isn't random wow and flutter: it tracks the vocal pitch deviations by exactly a factor of 26! Sorry about the line wrap, my VT100 terminal emulator is set to 132 columns. -- Steve Ito *PLONK* filter active for trolls. Macintosh IIfx - NetBSD 1.0 From tkarlsson@cern.ch Sun Jan 01 06:46:21 1995 Path: ashpoly!bigsur!pacrim!krgate!eunha!cern!tkarlsson From: tkarlsson@cern.ch (Tyler Karlsson) Newsgroups: comp.dsp Subject: Re: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Jan01.064621.5976@cern.ch> Date: Sun, 01 Jan 1995 06:46:21 GMT References: <1994Dec28.211321.6039@cmu.edu> <1994Dec30.110421.9987@cmu.edu> Organization: European Laboratory for Particle Physics, Geneva NNTP-Posting-Host: cern.ch X-Newsreader: Netscape 1.1N Lines: 11 In article <1994Dec30.110421.9987@cmu.edu>, mreyes@cmu.edu (Mikhail Reyes) writes: > That's how the 14 lines of the Stardust matrix are encoded. Each regional pressing contains one line of the decoded text. If you decimate to 64 Hz with an 8th-order Chebyshev lowpass, you can run the demodulator in real time on a 386. Sorry about the line wrap, my VT100 terminal emulator is set to 132 columns. -- === Tyler Karlsson === Dept of Electrical Engineering, European Laboratory for Particle Physics, Geneva "5 sigma is a discovery. 7 is a question." From lmoreno@netcom.com Mon Jan 02 03:09:21 1995 Path: ashpoly!cascade!bigsur!netcom!lmoreno From: lmoreno@netcom.com (Liam Moreno) Newsgroups: comp.dsp Subject: Re: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Jan02.030921.5801@netcom.com> Date: Mon, 02 Jan 1995 03:09:21 GMT References: <1994Dec28.211321.6039@cmu.edu> <1994Dec30.110421.9987@cmu.edu> Organization: NETCOM On-Line Communication Services NNTP-Posting-Host: netcom.com X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1994Dec30.110421.9987@cmu.edu>, mreyes@cmu.edu (Mikhail Reyes) writes: > That's how the 14 lines of the Stardust matrix are encoded. Each regional pressing contains one line of the decoded text. Have you checked your sound card's ADC clock? Cheap Sound Blaster cards use uncalibrated ceramic resonators that drift with temperature. -- === Liam Moreno === Dept of Electrical Engineering, NETCOM On-Line Communication Services "Row 14. No joke."