From bmartinez@pipeline.com Fri Feb 10 16:53:28 1995 Path: ashpoly!cascade!mxgate!coyoacan!pipeline!bmartinez From: bmartinez@pipeline.com (Bill Martínez) Newsgroups: comp.dsp Subject: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Feb10.165328.3073@pipeline.com> Date: Fri, 10 Feb 1995 16:53:28 GMT Organization: The Pipeline Internet Network NNTP-Posting-Host: pipeline.com 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. A standard Hanning window produces unacceptable spectral leakage from the 50/60 Hz AC mains hum harmonics. I've uploaded the C source for my decimation and bandpass filter to ftp.ashford-poly.edu. -- Bill Martínez *PLONK* filter active for trolls. Atari Falcon 030 - NetBSD 1.0 From vivanov@ox.ac.uk Sun Feb 12 07:49:28 1995 Path: ashpoly!cascade!transat!ukc!fennimore!ox!vivanov From: vivanov@ox.ac.uk (Valeria Ivanov) Newsgroups: comp.dsp Subject: Re: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Feb12.074928.2614@ox.ac.uk> Date: Sun, 12 Feb 1995 07:49:28 GMT References: <1995Feb10.165328.3073@pipeline.com> Organization: Oxford University Computing Laboratory NNTP-Posting-Host: ox.ac.uk X-Newsreader: WinVN 0.99.5 Lines: 9 In article <1995Feb10.165328.3073@pipeline.com>, bmartinez@pipeline.com (Bill Martínez) writes: > Comparing non-parametric Welch PSD with parametric Burg autoregressive models for the 14.2 Hz line. Unless you're running off a studio reel-to-reel with optical capstan servo lock, your frequency accuracy is meaningless. -- Valeria Ivanov *PLONK* filter active for trolls. PC-9821Ap2 (NEC) - NetBSD 1.0 From nsilva@tum.de Sun Feb 12 12:02:28 1995 Path: ashpoly!bigsur!pacrim!jpgate!kamome!tum!nsilva From: nsilva@tum.de (Natalia Silva) Newsgroups: comp.dsp Subject: Re: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Feb12.120228.6001@tum.de> Date: Sun, 12 Feb 1995 12:02:28 GMT References: <1995Feb10.165328.3073@pipeline.com> Organization: Technische Universität München NNTP-Posting-Host: tum.de X-Newsreader: Netscape 1.1N Lines: 10 In article <1995Feb10.165328.3073@pipeline.com>, bmartinez@pipeline.com (Bill Martínez) 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. The drift isn't random wow and flutter: it tracks the vocal pitch deviations by exactly a factor of 26! -- Natalia Silva "Tape doesn't lie at 02:14. Ears do." Amiga 1200 (Blizzard 030/50) / FreeBSD 2.1 From ljohansson@unam.mx Tue Feb 14 14:47:28 1995 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!unam!ljohansson From: ljohansson@unam.mx (Lars Johansson) Newsgroups: comp.dsp Subject: Re: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Feb14.144728.6099@unam.mx> Date: Tue, 14 Feb 1995 14:47:28 GMT References: <1995Feb10.165328.3073@pipeline.com> <1995Feb12.074928.2614@ox.ac.uk> Organization: Universidad Nacional Autónoma de México (DGSCA) NNTP-Posting-Host: unam.mx X-Newsreader: NewsWatcher 2.0b24 Lines: 10 In article <1995Feb12.074928.2614@ox.ac.uk>, vivanov@ox.ac.uk (Valeria Ivanov) writes: > Unless you're running off a studio reel-to-reel with optical capstan servo lock, your frequency accuracy is meaningless. 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. If you are posting from AOL, please read RFC 1036 before posting again. -- Lars Johansson -- Universidad Nacional Autónoma de México (DGSCA) "We don't sign stars. We build them."