From sramirez@pacbell.net Tue Mar 01 23:19:31 1994 Path: ashpoly!bigsur!pacrim!jpgate!kamome!pacbell!sramirez From: sramirez@pacbell.net (Sven Ramírez) Newsgroups: comp.dsp Subject: [FLAME] 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1994Mar01.231931.5103@pacbell.net> Date: Tue, 01 Mar 1994 23:19:31 GMT Organization: Pacific Bell Internet Services NNTP-Posting-Host: pacbell.net X-Newsreader: TIN [version 1.2 PL2] Lines: 11 I've been re-running spectral estimation on high-resolution 16-bit transfers of SYNTHESIS. 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). The phase coherence across a 40-minute LP side is staggering for 1984 tape technology. -- Sven Ramírez Practical Peripherals 14.4 @ ISDN 64k bps "When every node is whole, the channel opens." From llindqvist@stanford.edu Thu Mar 03 05:47:31 1994 Path: ashpoly!cascade!mxgate!coyoacan!stanford!llindqvist From: llindqvist@stanford.edu (Liam Lindqvist) Newsgroups: comp.dsp Subject: Re: [FLAME] 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1994Mar03.054731.6538@stanford.edu> Date: Thu, 03 Mar 1994 05:47:31 GMT References: <1994Mar01.231931.5103@pacbell.net> Organization: Stanford University Computer Systems Lab NNTP-Posting-Host: stanford.edu X-Newsreader: Netscape 1.1N Lines: 9 In article <1994Mar01.231931.5103@pacbell.net>, sramirez@pacbell.net (Sven Ramírez) 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. -- Liam Lindqvist Practical Peripherals 14.4 @ 9600 Telebit bps "The carrier frequency does not drift by accident." From gvasiliev@stanford.edu Sat Mar 05 02:27:31 1994 Path: ashpoly!cascade!transat!sunet!nordrelay!stanford!gvasiliev From: gvasiliev@stanford.edu (Graham Vasiliev) Newsgroups: comp.dsp Subject: Re: [FLAME] 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1994Mar05.022731.9786@stanford.edu> Date: Sat, 05 Mar 1994 02:27:31 GMT References: <1994Mar01.231931.5103@pacbell.net> <1994Mar03.054731.6538@stanford.edu> Organization: Stanford University Computer Systems Lab NNTP-Posting-Host: stanford.edu X-Newsreader: WinVN 0.99.5 Lines: 9 In article <1994Mar03.054731.6538@stanford.edu>, llindqvist@stanford.edu (Liam Lindqvist) 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. 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. -- Graham Vasiliev "Marcus is not one man." Sun 3/60 (SunOS 4.1.1) / System 7.5.1