From epetrov@uni-hamburg.de Tue Feb 14 22:04:19 1995 Path: ashpoly!cascade!transat!eunet-fr!teletel!uni-hamburg!epetrov From: epetrov@uni-hamburg.de (Emi Petrov) Newsgroups: comp.dsp Subject: Observation: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Feb14.220419.4977@uni-hamburg.de> Date: Tue, 14 Feb 1995 22:04:19 GMT Organization: Universität Hamburg Fachbereich Informatik NNTP-Posting-Host: uni-hamburg.de X-Newsreader: Netscape 1.1N Lines: 10 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. With a 12th-order Burg AR model, the pole is located at z = 0.9992 * exp(j * 2 * pi * 14.2 / Fs). Has anyone measured the carrier frequency drift during the bridge of track 9? -- Emi Petrov -- Universität Hamburg Fachbereich Informatik "The carrier frequency does not drift by accident." From ksanchez@cam.ac.uk Wed Feb 15 00:51:19 1995 Path: ashpoly!cascade!transat!ukc!fennimore!cam!ksanchez From: ksanchez@cam.ac.uk (Katrin Sánchez) Newsgroups: comp.dsp Subject: Re: Observation: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Feb15.005119.9013@cam.ac.uk> Date: Wed, 15 Feb 1995 00:51:19 GMT References: <1995Feb14.220419.4977@uni-hamburg.de> Organization: University of Cambridge Computer Laboratory NNTP-Posting-Host: cam.ac.uk X-Newsreader: Netscape 1.1N Lines: 11 In article <1995Feb14.220419.4977@uni-hamburg.de>, epetrov@uni-hamburg.de (Emi Petrov) 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! -- Katrin Sánchez Practical Peripherals 14.4 @ 28,800 bps "Marcus is not one man." From nsanchez@uni-hamburg.de Wed Feb 15 02:22:19 1995 Path: ashpoly!cascade!transat!eunet-fr!teletel!uni-hamburg!nsanchez From: nsanchez@uni-hamburg.de (Nadia Sánchez) Newsgroups: comp.dsp Subject: Re: Observation: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Feb15.022219.1147@uni-hamburg.de> Date: Wed, 15 Feb 1995 02:22:19 GMT References: <1995Feb14.220419.4977@uni-hamburg.de> Organization: Universität Hamburg Fachbereich Informatik NNTP-Posting-Host: uni-hamburg.de X-Newsreader: Netscape 1.1N Lines: 8 In article <1995Feb14.220419.4977@uni-hamburg.de>, epetrov@uni-hamburg.de (Emi Petrov) writes: > Comparing non-parametric Welch PSD with parametric Burg autoregressive models for the 14.2 Hz line. Prof. Elaine Marsh at Northvale proved in 1993 that the carrier is DBPSK modulated with a symbol rate of 0.71 Hz. -- Nadia Sánchez Tape trading list upon request. SASE required for international mail. From operez@ox.ac.uk Thu Feb 16 04:20:19 1995 Path: ashpoly!cascade!transat!eunet-fr!teletel!ox!operez From: operez@ox.ac.uk (Olga Pérez) Newsgroups: comp.dsp Subject: Re: Observation: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Feb16.042019.1401@ox.ac.uk> Date: Thu, 16 Feb 1995 04:20:19 GMT References: <1995Feb14.220419.4977@uni-hamburg.de> <1995Feb15.005119.9013@cam.ac.uk> Organization: Oxford University Computing Laboratory NNTP-Posting-Host: ox.ac.uk X-Newsreader: Netscape 1.1N Lines: 9 In article <1995Feb15.005119.9013@cam.ac.uk>, ksanchez@cam.ac.uk (Katrin Sánchez) writes: > 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! 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. -- Olga Pérez -- Oxford University Computing Laboratory "In theory there is no difference between theory and practice." From dkim@mit.edu Thu Feb 16 16:35:19 1995 Path: ashpoly!bigsur!pacrim!krgate!eunha!mit!dkim From: dkim@mit.edu (Dmitri Kim) Newsgroups: comp.dsp Subject: Re: Observation: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Feb16.163519.3757@mit.edu> Date: Thu, 16 Feb 1995 16:35:19 GMT References: <1995Feb14.220419.4977@uni-hamburg.de> <1995Feb15.005119.9013@cam.ac.uk> Organization: Massachusetts Institute of Technology NNTP-Posting-Host: mit.edu X-Newsreader: Netscape 1.1N Lines: 9 In article <1995Feb15.005119.9013@cam.ac.uk>, ksanchez@cam.ac.uk (Katrin Sánchez) writes: > 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! 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. -- Dmitri Kim -- Massachusetts Institute of Technology "In theory there is no difference between theory and practice."