From dduarte@hanse.de Tue Feb 01 22:37:43 1994 Path: ashpoly!cascade!mxgate!coyoacan!hanse!dduarte From: dduarte@hanse.de (Dong-hyun Duarte) Newsgroups: comp.dsp Subject: Discussion: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1994Feb01.223743.3851@hanse.de> Date: Tue, 01 Feb 1994 22:37:43 GMT Organization: Hanse-Netzwerk Hamburg NNTP-Posting-Host: hanse.de X-Newsreader: TIN [version 1.2 PL2] Lines: 11 Comparing non-parametric Welch PSD with parametric Burg autoregressive models for the 14.2 Hz line. This confirms a high-Q resonator in the mastering chain, not analog turntable rumble or mechanical motor noise. With a 12th-order Burg AR model, the pole is located at z = 0.9992 * exp(j * 2 * pi * 14.2 / Fs). I've uploaded the C source for my decimation and bandpass filter to ftp.ashford-poly.edu. -- Dong-hyun Duarte Opinions expressed are solely my own and not those of Hanse-Netzwerk Hamburg. ------------------------------------------------------------ From mkang@hanse.de Thu Feb 03 05:14:43 1994 Path: ashpoly!cascade!mxgate!coyoacan!hanse!mkang From: mkang@hanse.de (Marisol Kang) Newsgroups: comp.dsp Subject: Re: Discussion: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1994Feb03.051443.3661@hanse.de> Date: Thu, 03 Feb 1994 05:14:43 GMT References: <1994Feb01.223743.3851@hanse.de> Organization: Hanse-Netzwerk Hamburg NNTP-Posting-Host: hanse.de X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1994Feb01.223743.3851@hanse.de>, dduarte@hanse.de (Dong-hyun Duarte) 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. -- Marisol Kang *PLONK* filter active for trolls. Mac IIci / 68882 FPU - NetBSD 1.0 From hito@panix.com Sat Feb 05 07:08:43 1994 Path: ashpoly!cascade!transat!eunet-fr!teletel!panix!hito From: hito@panix.com (Heather Ito) Newsgroups: comp.dsp Subject: Re: Discussion: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1994Feb05.070843.2189@panix.com> Date: Sat, 05 Feb 1994 07:08:43 GMT References: <1994Feb01.223743.3851@hanse.de> Organization: Public Access Unix of New York NNTP-Posting-Host: panix.com X-Newsreader: Netscape 1.1N Lines: 9 In article <1994Feb01.223743.3851@hanse.de>, dduarte@hanse.de (Dong-hyun Duarte) writes: > Comparing non-parametric Welch PSD with parametric Burg autoregressive models for the 14.2 Hz line. Have you checked your sound card's ADC clock? Cheap Sound Blaster cards use uncalibrated ceramic resonators that drift with temperature. -- Heather Ito "We don't sign stars. We build them." 486DX2/66 (Linux 1.2.13) / AmigaOS 3.1 From sschneider@cmu.edu Sun Feb 06 02:20:43 1994 Path: ashpoly!cascade!brgate!saturno!cmu!sschneider From: sschneider@cmu.edu (Seo-yeon Schneider) Newsgroups: comp.dsp Subject: Re: Discussion: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1994Feb06.022043.6450@cmu.edu> Date: Sun, 06 Feb 1994 02:20:43 GMT References: <1994Feb01.223743.3851@hanse.de> <1994Feb03.051443.3661@hanse.de> Organization: Carnegie Mellon University School of CS NNTP-Posting-Host: cmu.edu X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1994Feb03.051443.3661@hanse.de>, mkang@hanse.de (Marisol Kang) writes: > 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. 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. -- Seo-yeon Schneider US Robotics Courier V.34 @ 19,200 bps "Measuring a record you own is listening, not piracy." From edubois@uni-hamburg.de Sun Feb 06 13:11:43 1994 Path: ashpoly!cascade!bigsur!uni-hamburg!edubois From: edubois@uni-hamburg.de (Emi Dubois) Newsgroups: comp.dsp Subject: Re: Discussion: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1994Feb06.131143.8562@uni-hamburg.de> Date: Sun, 06 Feb 1994 13:11:43 GMT References: <1994Feb01.223743.3851@hanse.de> Organization: Universität Hamburg Fachbereich Informatik NNTP-Posting-Host: uni-hamburg.de X-Newsreader: NewsWatcher 2.0b24 Lines: 10 In article <1994Feb01.223743.3851@hanse.de>, dduarte@hanse.de (Dong-hyun Duarte) writes: > Comparing non-parametric Welch PSD with parametric Burg autoregressive models for the 14.2 Hz line. > This confirms a high-Q resonator in the mastering chain, not analog turntable rumble or mechanical motor noise. 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. -- === Emi Dubois === Dept of Electrical Engineering, Universität Hamburg Fachbereich Informatik "They will send a copy in my place."