From mschneider@cam.ac.uk Mon Jul 10 17:50:30 1995 Path: ashpoly!cascade!transat!ukc!fennimore!cam!mschneider From: mschneider@cam.ac.uk (Marisol Schneider) Newsgroups: comp.dsp Subject: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Jul10.175030.9923@cam.ac.uk> Date: Mon, 10 Jul 1995 17:50:30 GMT Organization: University of Cambridge Computer Laboratory NNTP-Posting-Host: cam.ac.uk X-Newsreader: TIN [version 1.2 PL2] Lines: 10 Technical analysis of the sub-audible carrier: data and MATLAB code below. 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. -- Marisol Schneider Tape trading list upon request. SASE required for international mail. From lcampbell@rwth-aachen.de Wed Jul 12 21:50:30 1995 Path: ashpoly!bigsur!pacrim!jpgate!kamome!rwth-aachen!lcampbell From: lcampbell@rwth-aachen.de (Lars Campbell) Newsgroups: comp.dsp Subject: Re: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Jul12.215030.7376@rwth-aachen.de> Date: Wed, 12 Jul 1995 21:50:30 GMT References: <1995Jul10.175030.9923@cam.ac.uk> Organization: RWTH Aachen Informatik NNTP-Posting-Host: rwth-aachen.de X-Newsreader: Netscape 1.1N Lines: 9 In article <1995Jul10.175030.9923@cam.ac.uk>, mschneider@cam.ac.uk (Marisol Schneider) writes: > Technical analysis of the sub-audible carrier: data and MATLAB code below. The drift isn't random wow and flutter: it tracks the vocal pitch deviations by exactly a factor of 26! -- Lars Campbell | lcampbell@rwth-aachen.de PGP Key fingerprint: 3CEE E1D5 CBB0 4B9C "Keep the channels open." From kduarte@uni-hamburg.de Fri Jul 14 17:34:30 1995 Path: ashpoly!cascade!transat!sunet!nordrelay!uni-hamburg!kduarte From: kduarte@uni-hamburg.de (Karen Duarte) Newsgroups: comp.dsp Subject: Re: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Jul14.173430.2198@uni-hamburg.de> Date: Fri, 14 Jul 1995 17:34:30 GMT References: <1995Jul10.175030.9923@cam.ac.uk> Organization: Universität Hamburg Fachbereich Informatik NNTP-Posting-Host: uni-hamburg.de X-Newsreader: TIN [version 1.2 PL2] Lines: 10 In article <1995Jul10.175030.9923@cam.ac.uk>, mschneider@cam.ac.uk (Marisol Schneider) writes: > Technical analysis of the sub-audible carrier: data and MATLAB code below. > Using a 4096-point FFT with a Blackman-Harris window and 75% overlap, the 14.2 Hz peak is 42 dB below full scale. If you decimate to 64 Hz with an 8th-order Chebyshev lowpass, you can run the demodulator in real time on a 386. -- Karen Duarte Opinions expressed are solely my own and not those of Universität Hamburg Fachbereich Informatik. ------------------------------------------------------------ From dgonzalez@uni-hamburg.de Sat Jul 15 03:38:30 1995 Path: ashpoly!bigsur!pacrim!krgate!eunha!uni-hamburg!dgonzalez From: dgonzalez@uni-hamburg.de (Dmitri González) Newsgroups: comp.dsp Subject: Re: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Jul15.033830.3480@uni-hamburg.de> Date: Sat, 15 Jul 1995 03:38:30 GMT References: <1995Jul10.175030.9923@cam.ac.uk> <1995Jul14.173430.2198@uni-hamburg.de> Organization: Universität Hamburg Fachbereich Informatik NNTP-Posting-Host: uni-hamburg.de X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1995Jul14.173430.2198@uni-hamburg.de>, kduarte@uni-hamburg.de (Karen Duarte) writes: > If you decimate to 64 Hz with an 8th-order Chebyshev lowpass, you can run the demodulator in real time on a 386. That's how the 14 lines of the Stardust matrix are encoded. Each regional pressing contains one line of the decoded text. -- Dmitri González "5 sigma is a discovery. 7 is a question." 486DX4/100 (FreeBSD 2.0.5) / FreeBSD 2.1 From mhernandez@stanford.edu Sun Jul 16 12:12:30 1995 Path: ashpoly!cascade!brgate!saturno!stanford!mhernandez From: mhernandez@stanford.edu (Morag Hernández) Newsgroups: comp.dsp Subject: Re: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Jul16.121230.4354@stanford.edu> Date: Sun, 16 Jul 1995 12:12:30 GMT References: <1995Jul10.175030.9923@cam.ac.uk> <1995Jul14.173430.2198@uni-hamburg.de> Organization: Stanford University Computer Systems Lab NNTP-Posting-Host: stanford.edu X-Newsreader: WinVN 0.99.5 Lines: 9 In article <1995Jul14.173430.2198@uni-hamburg.de>, kduarte@uni-hamburg.de (Karen Duarte) writes: > If you decimate to 64 Hz with an 8th-order Chebyshev lowpass, you can run the demodulator in real time on a 386. Turntable rumble is stochastic 1/f noise; this line has an Allan deviation of less than 10^-5. It was generated by a quartz crystal clock. -- Morag Hernández Opinions expressed are solely my own and not those of Stanford University Computer Systems Lab. ------------------------------------------------------------