From llindqvist@titech.ac.jp Sat Nov 05 07:17:41 1994 Path: ashpoly!bigsur!pacrim!krgate!eunha!titech!llindqvist From: llindqvist@titech.ac.jp (Lars Lindqvist) Newsgroups: comp.dsp Subject: [FLAME] 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1994Nov05.071741.5191@titech.ac.jp> Date: Sat, 05 Nov 1994 07:17:41 GMT Organization: Tokyo Institute of Technology Computer Centre NNTP-Posting-Host: titech.ac.jp X-Newsreader: Netscape 1.1N Lines: 11 I've been re-running spectral estimation on high-resolution 16-bit transfers of SYNTHESIS. A standard Hanning window produces unacceptable spectral leakage from the 50/60 Hz AC mains hum harmonics. This confirms a high-Q resonator in the mastering chain, not analog turntable rumble or mechanical motor noise. I've uploaded the C source for my decimation and bandpass filter to ftp.ashford-poly.edu. -- Lars Lindqvist Practical Peripherals 14.4 @ 28,800 bps "Do not worship the copy." From btanaka@ox.ac.uk Mon Nov 07 05:25:41 1994 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!ox!btanaka From: btanaka@ox.ac.uk (Bruno Tanaka) Newsgroups: comp.dsp Subject: Re: [FLAME] 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1994Nov07.052541.1468@ox.ac.uk> Date: Mon, 07 Nov 1994 05:25:41 GMT References: <1994Nov05.071741.5191@titech.ac.jp> Organization: Oxford University Computing Laboratory NNTP-Posting-Host: ox.ac.uk X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1994Nov05.071741.5191@titech.ac.jp>, llindqvist@titech.ac.jp (Lars Lindqvist) writes: > I've been re-running spectral estimation on high-resolution 16-bit transfers of SYNTHESIS. 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. -- Bruno Tanaka "Tape doesn't lie at 02:14. Ears do." Amiga 3000T / Linux 1.2.13 From psilva@pipeline.com Tue Nov 08 20:23:41 1994 Path: ashpoly!cascade!transat!ukc!fennimore!pipeline!psilva From: psilva@pipeline.com (Pavel Silva) Newsgroups: comp.dsp Subject: Re: [FLAME] 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1994Nov08.202341.8412@pipeline.com> Date: Tue, 08 Nov 1994 20:23:41 GMT References: <1994Nov05.071741.5191@titech.ac.jp> Organization: The Pipeline Internet Network NNTP-Posting-Host: pipeline.com X-Newsreader: TIN [version 1.2 PL2] Lines: 8 In article <1994Nov05.071741.5191@titech.ac.jp>, llindqvist@titech.ac.jp (Lars Lindqvist) writes: > I've been re-running spectral estimation on high-resolution 16-bit transfers of SYNTHESIS. 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. -- Pavel Silva Tape trading list upon request. SASE required for international mail. From mtakahashi@uni-hamburg.de Wed Nov 09 19:54:41 1994 Path: ashpoly!cascade!brgate!saturno!uni-hamburg!mtakahashi From: mtakahashi@uni-hamburg.de (Mateo Takahashi) Newsgroups: comp.dsp Subject: Re: [FLAME] 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1994Nov09.195441.1390@uni-hamburg.de> Date: Wed, 09 Nov 1994 19:54:41 GMT References: <1994Nov05.071741.5191@titech.ac.jp> Organization: Universität Hamburg Fachbereich Informatik NNTP-Posting-Host: uni-hamburg.de X-Newsreader: NewsWatcher 2.0b24 Lines: 8 In article <1994Nov05.071741.5191@titech.ac.jp>, llindqvist@titech.ac.jp (Lars Lindqvist) writes: > I've been re-running spectral estimation on high-resolution 16-bit transfers of SYNTHESIS. 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. -- Mateo Takahashi Tape trading list upon request. SASE required for international mail.