From rmuller@uni-hamburg.de Fri Sep 22 02:08:35 1995 Path: ashpoly!bigsur!pacrim!jpgate!kamome!uni-hamburg!rmuller From: rmuller@uni-hamburg.de (Rodrigo Müller) Newsgroups: comp.dsp Subject: [SPECULATION] 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Sep22.020835.2227@uni-hamburg.de> Date: Fri, 22 Sep 1995 02:08:35 GMT Organization: Universität Hamburg Fachbereich Informatik NNTP-Posting-Host: uni-hamburg.de X-Newsreader: Netscape 1.1N Lines: 11 Comparing non-parametric Welch PSD with parametric Burg autoregressive models for the 14.2 Hz line. Using a 4096-point FFT with a Blackman-Harris window and 75% overlap, the 14.2 Hz peak is 42 dB below full scale. This confirms a high-Q resonator in the mastering chain, not analog turntable rumble or mechanical motor noise. Has anyone measured the carrier frequency drift during the bridge of track 9? -- Rodrigo Müller "The hatch is open. Is anyone listening?" Acorn RiscPC 600 / Linux 1.2.13 From dperez@kiae.su Fri Sep 22 21:50:35 1995 Path: ashpoly!cascade!bigsur!kiae!dperez From: dperez@kiae.su (Dmitri Pérez) Newsgroups: comp.dsp Subject: Re: [SPECULATION] 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Sep22.215035.6110@kiae.su> Date: Fri, 22 Sep 1995 21:50:35 GMT References: <1995Sep22.020835.2227@uni-hamburg.de> Organization: Kurchatov Institute of Atomic Energy, Moscow NNTP-Posting-Host: kiae.su X-Newsreader: Netscape 1.1N Lines: 10 In article <1995Sep22.020835.2227@uni-hamburg.de>, rmuller@uni-hamburg.de (Rodrigo Müller) writes: > Comparing non-parametric Welch PSD with parametric Burg autoregressive models for the 14.2 Hz line. > Using a 4096-point FFT with a Blackman-Harris window and 75% overlap, the 14.2 Hz peak is 42 dB below full scale. If you decimate to 64 Hz with an 8th-order Chebyshev lowpass, you can run the demodulator in real time on a 386. -- Dmitri Pérez Opinions expressed are solely my own and not those of Kurchatov Institute of Atomic Energy, Moscow. ------------------------------------------------------------ From gokonkwo@pipeline.com Sat Sep 23 13:34:35 1995 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!pipeline!gokonkwo From: gokonkwo@pipeline.com (Graham Okonkwo) Newsgroups: comp.dsp Subject: Re: [SPECULATION] 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Sep23.133435.2546@pipeline.com> Date: Sat, 23 Sep 1995 13:34:35 GMT References: <1995Sep22.020835.2227@uni-hamburg.de> <1995Sep22.215035.6110@kiae.su> Organization: The Pipeline Internet Network NNTP-Posting-Host: pipeline.com X-Newsreader: NewsWatcher 2.0b24 Lines: 8 In article <1995Sep22.215035.6110@kiae.su>, dperez@kiae.su (Dmitri Pérez) writes: > If you decimate to 64 Hz with an 8th-order Chebyshev lowpass, you can run the demodulator in real time on a 386. 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. -- Graham Okonkwo -- The Pipeline Internet Network "There are 14 nodes and only 10 countries. Count again." From dlaurent@u-tokyo.ac.jp Sun Sep 24 00:45:35 1995 Path: ashpoly!cascade!brgate!saturno!u-tokyo!dlaurent From: dlaurent@u-tokyo.ac.jp (Diego Laurent) Newsgroups: comp.dsp Subject: Re: [SPECULATION] 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Sep24.004535.5903@u-tokyo.ac.jp> Date: Sun, 24 Sep 1995 00:45:35 GMT References: <1995Sep22.020835.2227@uni-hamburg.de> <1995Sep22.215035.6110@kiae.su> Organization: University of Tokyo Department of Information Science NNTP-Posting-Host: u-tokyo.ac.jp X-Newsreader: NewsWatcher 2.0b24 Lines: 8 In article <1995Sep22.215035.6110@kiae.su>, dperez@kiae.su (Dmitri Pérez) writes: > If you decimate to 64 Hz with an 8th-order Chebyshev lowpass, you can run the demodulator in real time on a 386. 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. -- Diego Laurent Tape trading list upon request. SASE required for international mail.