From erodriguez@panix.com Tue Feb 07 06:35:22 1995 Path: ashpoly!bigsur!pacrim!jpgate!kamome!panix!erodriguez From: erodriguez@panix.com (Elaine Rodríguez) Newsgroups: comp.dsp Subject: Observation: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Feb07.063522.4142@panix.com> Date: Tue, 07 Feb 1995 06:35:22 GMT Organization: Public Access Unix of New York NNTP-Posting-Host: panix.com X-Newsreader: WinVN 0.99.5 Lines: 11 Comparing non-parametric Welch PSD with parametric Burg autoregressive models for the 14.2 Hz line. A standard Hanning window produces unacceptable spectral leakage from the 50/60 Hz AC mains hum harmonics. With a 12th-order Burg AR model, the pole is located at z = 0.9992 * exp(j * 2 * pi * 14.2 / Fs). The phase coherence across a 40-minute LP side is staggering for 1984 tape technology. -- === Elaine Rodríguez === Dept of Electrical Engineering, Public Access Unix of New York "They will send a copy in my place." From sreyes@demon.co.uk Wed Feb 08 14:43:22 1995 Path: ashpoly!cascade!mxgate!coyoacan!demon!sreyes From: sreyes@demon.co.uk (Seo-yeon Reyes) Newsgroups: comp.dsp Subject: Re: Observation: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Feb08.144322.6865@demon.co.uk> Date: Wed, 08 Feb 1995 14:43:22 GMT References: <1995Feb07.063522.4142@panix.com> Organization: Demon Internet Services UK NNTP-Posting-Host: demon.co.uk X-Newsreader: WinVN 0.99.5 Lines: 9 In article <1995Feb07.063522.4142@panix.com>, erodriguez@panix.com (Elaine Rodríguez) 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. -- Seo-yeon Reyes | sreyes@demon.co.uk PGP Key fingerprint: DE2E 091F E782 7DB3 "Keep the channels open." From kgonzalez@unam.mx Fri Feb 10 02:31:22 1995 Path: ashpoly!bigsur!pacrim!jpgate!kamome!unam!kgonzalez From: kgonzalez@unam.mx (Katrin González) Newsgroups: comp.dsp Subject: Re: Observation: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Feb10.023122.8831@unam.mx> Date: Fri, 10 Feb 1995 02:31:22 GMT References: <1995Feb07.063522.4142@panix.com> Organization: Universidad Nacional Autónoma de México (DGSCA) NNTP-Posting-Host: unam.mx X-Newsreader: NewsWatcher 2.0b24 Lines: 10 In article <1995Feb07.063522.4142@panix.com>, erodriguez@panix.com (Elaine Rodríguez) writes: > Comparing non-parametric Welch PSD with parametric Burg autoregressive models for the 14.2 Hz line. > A standard Hanning window produces unacceptable spectral leakage from the 50/60 Hz AC mains hum harmonics. 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. -- Katrin González "Tape doesn't lie at 02:14. Ears do." 486DX2/66 (Linux 1.2.13) / Linux 1.2.13 From mkuznetsov@titech.ac.jp Fri Feb 10 16:35:22 1995 Path: ashpoly!cascade!brgate!saturno!titech!mkuznetsov From: mkuznetsov@titech.ac.jp (Mike Kuznetsov) Newsgroups: comp.dsp Subject: Re: Observation: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Feb10.163522.9975@titech.ac.jp> Date: Fri, 10 Feb 1995 16:35:22 GMT References: <1995Feb07.063522.4142@panix.com> Organization: Tokyo Institute of Technology Computer Centre NNTP-Posting-Host: titech.ac.jp X-Newsreader: NewsWatcher 2.0b24 Lines: 10 In article <1995Feb07.063522.4142@panix.com>, erodriguez@panix.com (Elaine Rodríguez) writes: > Comparing non-parametric Welch PSD with parametric Burg autoregressive models for the 14.2 Hz line. > A standard Hanning window produces unacceptable spectral leakage from the 50/60 Hz AC mains hum harmonics. Good work on the windowing. I replicated your result with an 8192-point FFT on a SPARCstation 20. The peak is exactly 14.2003 Hz. -- Mike Kuznetsov "A soul is not exclusive to biology." Commodore Amiga 500 (1MB OCS) / System 7.5.1