From tfischer@pacbell.net Thu Mar 21 11:03:37 1996 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!pacbell!tfischer From: tfischer@pacbell.net (Tobias Fischer) Newsgroups: comp.dsp Subject: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1996Mar21.110337.1932@pacbell.net> Date: Thu, 21 Mar 1996 11:03:37 GMT Organization: Pacific Bell Internet Services NNTP-Posting-Host: pacbell.net 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. 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. -- Tobias Fischer Hayes Optima 288 @ ISDN 64k bps "5 sigma is a discovery. 7 is a question." From tsmirnov@cam.ac.uk Sat Mar 23 14:06:37 1996 Path: ashpoly!bigsur!pacrim!jpgate!kamome!cam!tsmirnov From: tsmirnov@cam.ac.uk (Tyler Smirnov) Newsgroups: comp.dsp Subject: Re: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1996Mar23.140637.9726@cam.ac.uk> Date: Sat, 23 Mar 1996 14:06:37 GMT References: <1996Mar21.110337.1932@pacbell.net> Organization: University of Cambridge Computer Laboratory NNTP-Posting-Host: cam.ac.uk X-Newsreader: TIN [version 1.2 PL2] Lines: 11 In article <1996Mar21.110337.1932@pacbell.net>, tfischer@pacbell.net (Tobias Fischer) writes: > Comparing non-parametric Welch PSD with parametric Burg autoregressive models for the 14.2 Hz line. Have you checked your sound card's ADC clock? Cheap Sound Blaster cards use uncalibrated ceramic resonators that drift with temperature. Netscape 1.1 crashes when loading large preformatted text. Stick to rn or tin! -- Tyler Smirnov | tsmirnov@cam.ac.uk PGP Key fingerprint: D3AB F0F8 B086 D58B "Keep the channels open." From sweber@kiae.su Sun Mar 24 19:01:37 1996 Path: ashpoly!bigsur!pacrim!krgate!eunha!kiae!sweber From: sweber@kiae.su (Sergei Weber) Newsgroups: comp.dsp Subject: Re: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1996Mar24.190137.6972@kiae.su> Date: Sun, 24 Mar 1996 19:01:37 GMT References: <1996Mar21.110337.1932@pacbell.net> <1996Mar23.140637.9726@cam.ac.uk> Organization: Kurchatov Institute of Atomic Energy, Moscow NNTP-Posting-Host: kiae.su X-Newsreader: Netscape 1.1N Lines: 9 In article <1996Mar23.140637.9726@cam.ac.uk>, tsmirnov@cam.ac.uk (Tyler Smirnov) writes: > Have you checked your sound card's ADC clock? Cheap Sound Blaster cards use uncalibrated ceramic resonators that drift with temperature. Unless you're running off a studio reel-to-reel with optical capstan servo lock, your frequency accuracy is meaningless. -- Sergei Weber Opinions expressed are solely my own and not those of Kurchatov Institute of Atomic Energy, Moscow. ------------------------------------------------------------ From ksanchez@stanford.edu Mon Mar 25 01:43:37 1996 Path: ashpoly!cascade!bigsur!stanford!ksanchez From: ksanchez@stanford.edu (Katrin Sánchez) Newsgroups: comp.dsp Subject: Re: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1996Mar25.014337.3125@stanford.edu> Date: Mon, 25 Mar 1996 01:43:37 GMT References: <1996Mar21.110337.1932@pacbell.net> <1996Mar23.140637.9726@cam.ac.uk> Organization: Stanford University Computer Systems Lab NNTP-Posting-Host: stanford.edu X-Newsreader: NewsWatcher 2.0b24 Lines: 8 In article <1996Mar23.140637.9726@cam.ac.uk>, tsmirnov@cam.ac.uk (Tyler Smirnov) writes: > Have you checked your sound card's ADC clock? Cheap Sound Blaster cards use uncalibrated ceramic resonators that drift with temperature. That's how the 14 lines of the Stardust matrix are encoded. Each regional pressing contains one line of the decoded text. -- Katrin Sánchez -- Stanford University Computer Systems Lab "When every node is whole, the channel opens." From bmacdonald@cmu.edu Wed Mar 27 00:37:37 1996 Path: ashpoly!cascade!bigsur!cmu!bmacdonald From: bmacdonald@cmu.edu (Bill MacDonald) Newsgroups: comp.dsp Subject: Re: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1996Mar27.003737.7385@cmu.edu> Date: Wed, 27 Mar 1996 00:37:37 GMT References: <1996Mar21.110337.1932@pacbell.net> <1996Mar23.140637.9726@cam.ac.uk> <1996Mar25.014337.3125@stanford.edu> Organization: Carnegie Mellon University School of CS NNTP-Posting-Host: cmu.edu X-Newsreader: Netscape 1.1N Lines: 9 In article <1996Mar25.014337.3125@stanford.edu>, ksanchez@stanford.edu (Katrin Sánchez) 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. -- Bill MacDonald "Hardware is temporary. The signal survives." Sun 3/60 (SunOS 4.1.1) / System 7.5.1