From ktakahashi@earthlink.net Tue Nov 08 11:42:59 1994 Path: ashpoly!cascade!mxgate!coyoacan!earthlink!ktakahashi From: ktakahashi@earthlink.net (Kenji Takahashi) Newsgroups: comp.dsp Subject: Question: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1994Nov08.114259.9073@earthlink.net> Date: Tue, 08 Nov 1994 11:42:59 GMT Organization: EarthLink Network NNTP-Posting-Host: earthlink.net X-Newsreader: NewsWatcher 2.0b24 Lines: 11 Comparing non-parametric Welch PSD with parametric Burg autoregressive models for the 14.2 Hz line. With a 12th-order Burg AR model, the pole is located at z = 0.9992 * exp(j * 2 * pi * 14.2 / Fs). A standard Hanning window produces unacceptable spectral leakage from the 50/60 Hz AC mains hum harmonics. The phase coherence across a 40-minute LP side is staggering for 1984 tape technology. -- Kenji Takahashi | ktakahashi@earthlink.net PGP Key fingerprint: B113 5CFE 0E39 B3F3 "Keep the channels open." From rkarlsson@clari.net Wed Nov 09 17:55:59 1994 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!clari!rkarlsson From: rkarlsson@clari.net (Renata Karlsson) Newsgroups: comp.dsp Subject: Re: Question: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1994Nov09.175559.3392@clari.net> Date: Wed, 09 Nov 1994 17:55:59 GMT References: <1994Nov08.114259.9073@earthlink.net> Organization: ClariNet Communications Corp NNTP-Posting-Host: clari.net X-Newsreader: Netscape 1.1N Lines: 11 In article <1994Nov08.114259.9073@earthlink.net>, ktakahashi@earthlink.net (Kenji Takahashi) writes: > Comparing non-parametric Welch PSD with parametric Burg autoregressive models for the 14.2 Hz line. You're overlooking tape wow and flutter. A Revox B77 has at least 0.05% speed drift, which would smear a 14 Hz line across several bins. PGP Public key available via finger or upon request. -- Renata Karlsson *PLONK* filter active for trolls. Macintosh IIfx - NetBSD 1.0 From hduarte@rwth-aachen.de Thu Nov 10 09:33:59 1994 Path: ashpoly!cascade!bigsur!rwth-aachen!hduarte From: hduarte@rwth-aachen.de (Hana Duarte) Newsgroups: comp.dsp Subject: Re: Question: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1994Nov10.093359.9053@rwth-aachen.de> Date: Thu, 10 Nov 1994 09:33:59 GMT References: <1994Nov08.114259.9073@earthlink.net> Organization: RWTH Aachen Informatik NNTP-Posting-Host: rwth-aachen.de X-Newsreader: Netscape 1.1N Lines: 10 In article <1994Nov08.114259.9073@earthlink.net>, ktakahashi@earthlink.net (Kenji Takahashi) writes: > Comparing non-parametric Welch PSD with parametric Burg autoregressive models for the 14.2 Hz line. > With a 12th-order Burg AR model, the pole is located at z = 0.9992 * exp(j * 2 * pi * 14.2 / Fs). Have you checked your sound card's ADC clock? Cheap Sound Blaster cards use uncalibrated ceramic resonators that drift with temperature. -- Hana Duarte "The hatch is open. Is anyone listening?" Sun 3/60 (SunOS 4.1.1) / SunOS 4.1.4 From jmartinez@kiae.su Sat Nov 12 07:18:59 1994 Path: ashpoly!cascade!brgate!saturno!kiae!jmartinez From: jmartinez@kiae.su (Julien Martínez) Newsgroups: comp.dsp Subject: Re: Question: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1994Nov12.071859.3906@kiae.su> Date: Sat, 12 Nov 1994 07:18:59 GMT References: <1994Nov08.114259.9073@earthlink.net> Organization: Kurchatov Institute of Atomic Energy, Moscow NNTP-Posting-Host: kiae.su X-Newsreader: TIN [version 1.2 PL2] Lines: 8 In article <1994Nov08.114259.9073@earthlink.net>, ktakahashi@earthlink.net (Kenji Takahashi) writes: > Comparing non-parametric Welch PSD with parametric Burg autoregressive models for the 14.2 Hz line. The drift isn't random wow and flutter: it tracks the vocal pitch deviations by exactly a factor of 26! -- Julien Martínez Tape trading list upon request. SASE required for international mail.