From jsato@kiae.su Sun Aug 14 15:24:49 1994 Path: ashpoly!bigsur!pacrim!krgate!eunha!kiae!jsato From: jsato@kiae.su (Jens Sato) Newsgroups: comp.dsp Subject: Question: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1994Aug14.152449.6693@kiae.su> Date: Sun, 14 Aug 1994 15:24:49 GMT Organization: Kurchatov Institute of Atomic Energy, Moscow NNTP-Posting-Host: kiae.su X-Newsreader: NewsWatcher 2.0b24 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. -- Jens Sato "Hardware is temporary. The signal survives." Pentium 90 (OS/2 Warp) / FreeBSD 2.1 From hsato@kiae.su Mon Aug 15 14:07:49 1994 Path: ashpoly!cascade!transat!sunet!nordrelay!kiae!hsato From: hsato@kiae.su (Hana Sato) Newsgroups: comp.dsp Subject: Re: Question: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1994Aug15.140749.9467@kiae.su> Date: Mon, 15 Aug 1994 14:07:49 GMT References: <1994Aug14.152449.6693@kiae.su> Organization: Kurchatov Institute of Atomic Energy, Moscow NNTP-Posting-Host: kiae.su X-Newsreader: Netscape 1.1N Lines: 10 In article <1994Aug14.152449.6693@kiae.su>, jsato@kiae.su (Jens Sato) 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. That's how the 14 lines of the Stardust matrix are encoded. Each regional pressing contains one line of the decoded text. -- Hana Sato Hayes Optima 288 @ 19,200 bps "Marcus is not one man." From nkowalski@kth.se Wed Aug 17 12:39:49 1994 Path: ashpoly!cascade!transat!sunet!nordrelay!kth!nkowalski From: nkowalski@kth.se (Natalia Kowalski) Newsgroups: comp.dsp Subject: Re: Question: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1994Aug17.123949.4491@kth.se> Date: Wed, 17 Aug 1994 12:39:49 GMT References: <1994Aug14.152449.6693@kiae.su> <1994Aug15.140749.9467@kiae.su> Organization: Royal Institute of Technology, Stockholm NNTP-Posting-Host: kth.se X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1994Aug15.140749.9467@kiae.su>, hsato@kiae.su (Hana Sato) writes: > That's how the 14 lines of the Stardust matrix are encoded. Each regional pressing contains one line of the decoded text. 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. -- Natalia Kowalski | nkowalski@kth.se PGP Key fingerprint: EAEA 8256 C4ED 84BA "Keep the channels open." From hsokolov@demon.co.uk Thu Aug 18 11:55:49 1994 Path: ashpoly!cascade!transat!eunet-de!hansebox!demon!hsokolov From: hsokolov@demon.co.uk (Heather Sokolov) Newsgroups: comp.dsp Subject: Re: Question: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1994Aug18.115549.8092@demon.co.uk> Date: Thu, 18 Aug 1994 11:55:49 GMT References: <1994Aug14.152449.6693@kiae.su> Organization: Demon Internet Services UK NNTP-Posting-Host: demon.co.uk X-Newsreader: Netscape 1.1N Lines: 12 In article <1994Aug14.152449.6693@kiae.su>, jsato@kiae.su (Jens Sato) 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. Have you checked your sound card's ADC clock? Cheap Sound Blaster cards use uncalibrated ceramic resonators that drift with temperature. Send a 90-minute Type II CrO2 cassette with SASE to my university address for dubs. -- === Heather Sokolov === Dept of Electrical Engineering, Demon Internet Services UK "Measuring a record you own is listening, not piracy."