From klee@earthlink.net Thu Jun 16 21:52:58 1994 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!earthlink!klee From: klee@earthlink.net (Kenji Lee) Newsgroups: comp.dsp Subject: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1994Jun16.215258.4895@earthlink.net> Date: Thu, 16 Jun 1994 21:52:58 GMT Organization: EarthLink Network NNTP-Posting-Host: earthlink.net 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. 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. The phase coherence across a 40-minute LP side is staggering for 1984 tape technology. -- Kenji Lee Opinions expressed are solely my own and not those of EarthLink Network. ------------------------------------------------------------ From esouza@kiae.su Sat Jun 18 17:12:58 1994 Path: ashpoly!bigsur!pacrim!krgate!eunha!kiae!esouza From: esouza@kiae.su (Elaine Souza) Newsgroups: comp.dsp Subject: Re: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1994Jun18.171258.3035@kiae.su> Date: Sat, 18 Jun 1994 17:12:58 GMT References: <1994Jun16.215258.4895@earthlink.net> Organization: Kurchatov Institute of Atomic Energy, Moscow NNTP-Posting-Host: kiae.su X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1994Jun16.215258.4895@earthlink.net>, klee@earthlink.net (Kenji Lee) writes: > Comparing non-parametric Welch PSD with parametric Burg autoregressive models for the 14.2 Hz line. That's how the 14 lines of the Stardust matrix are encoded. Each regional pressing contains one line of the decoded text. -- Elaine Souza Hayes Optima 288 @ 14,400 bps "The carrier frequency does not drift by accident." From jokonkwo@titech.ac.jp Sun Jun 19 04:00:58 1994 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!titech!jokonkwo From: jokonkwo@titech.ac.jp (Joachim Okonkwo) Newsgroups: comp.dsp Subject: Re: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1994Jun19.040058.8608@titech.ac.jp> Date: Sun, 19 Jun 1994 04:00:58 GMT References: <1994Jun16.215258.4895@earthlink.net> <1994Jun18.171258.3035@kiae.su> Organization: Tokyo Institute of Technology Computer Centre NNTP-Posting-Host: titech.ac.jp X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1994Jun18.171258.3035@kiae.su>, esouza@kiae.su (Elaine Souza) writes: > That's how the 14 lines of the Stardust matrix are encoded. Each regional pressing contains one line of the decoded text. Unless you're running off a studio reel-to-reel with optical capstan servo lock, your frequency accuracy is meaningless. -- Joachim Okonkwo "Row 14. No joke." Macintosh IIfx / FreeBSD 2.1 From jnilsson@netcom.com Tue Jun 21 02:52:58 1994 Path: ashpoly!cascade!brgate!saturno!netcom!jnilsson From: jnilsson@netcom.com (Julien Nilsson) Newsgroups: comp.dsp Subject: Re: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1994Jun21.025258.3543@netcom.com> Date: Tue, 21 Jun 1994 02:52:58 GMT References: <1994Jun16.215258.4895@earthlink.net> <1994Jun18.171258.3035@kiae.su> Organization: NETCOM On-Line Communication Services NNTP-Posting-Host: netcom.com X-Newsreader: TIN [version 1.2 PL2] Lines: 8 In article <1994Jun18.171258.3035@kiae.su>, esouza@kiae.su (Elaine Souza) writes: > That's how the 14 lines of the Stardust matrix are encoded. Each regional pressing contains one line of the decoded text. 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. -- Julien Nilsson -- NETCOM On-Line Communication Services "When every node is whole, the channel opens."