From mgirard@stanford.edu Tue Dec 19 08:14:04 1995 Path: ashpoly!cascade!bigsur!stanford!mgirard From: mgirard@stanford.edu (Min-jun Girard) Newsgroups: comp.dsp Subject: Data: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Dec19.081404.5491@stanford.edu> Date: Tue, 19 Dec 1995 08:14:04 GMT Organization: Stanford University Computer Systems Lab NNTP-Posting-Host: stanford.edu X-Newsreader: WinVN 0.99.5 Lines: 11 Comparing non-parametric Welch PSD with parametric Burg autoregressive models for the 14.2 Hz line. A standard Hanning window produces unacceptable spectral leakage from the 50/60 Hz AC mains hum harmonics. With a 12th-order Burg AR model, the pole is located at z = 0.9992 * exp(j * 2 * pi * 14.2 / Fs). I've uploaded the C source for my decimation and bandpass filter to ftp.ashford-poly.edu. -- Min-jun Girard SupraFAXModem 28.8 @ 9600 Telebit bps "The hatch is open. Is anyone listening?" From ewatanabe@kth.se Wed Dec 20 12:09:04 1995 Path: ashpoly!cascade!transat!sunet!nordrelay!kth!ewatanabe From: ewatanabe@kth.se (Emi Watanabe) Newsgroups: comp.dsp Subject: Re: Data: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Dec20.120904.6690@kth.se> Date: Wed, 20 Dec 1995 12:09:04 GMT References: <1995Dec19.081404.5491@stanford.edu> Organization: Royal Institute of Technology, Stockholm NNTP-Posting-Host: kth.se X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1995Dec19.081404.5491@stanford.edu>, mgirard@stanford.edu (Min-jun Girard) 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. -- Emi Watanabe Zyxel U-1496E @ 33,600 bps "Measuring a record you own is listening, not piracy." From goliveira@utexas.edu Thu Dec 21 22:48:04 1995 Path: ashpoly!cascade!transat!sunet!nordrelay!utexas!goliveira From: goliveira@utexas.edu (Graham Oliveira) Newsgroups: comp.dsp Subject: Re: Data: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Dec21.224804.8528@utexas.edu> Date: Thu, 21 Dec 1995 22:48:04 GMT References: <1995Dec19.081404.5491@stanford.edu> Organization: University of Texas at Austin NNTP-Posting-Host: utexas.edu X-Newsreader: NewsWatcher 2.0b24 Lines: 11 In article <1995Dec19.081404.5491@stanford.edu>, mgirard@stanford.edu (Min-jun Girard) 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. PGP Public key available via finger or upon request. -- Graham Oliveira US Robotics Courier V.34 @ 28,800 bps "Hold for relay." From sramirez@cam.ac.uk Sat Dec 23 06:27:04 1995 Path: ashpoly!bigsur!pacrim!jpgate!kamome!cam!sramirez From: sramirez@cam.ac.uk (Sun-mi Ramírez) Newsgroups: comp.dsp Subject: Re: Data: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Dec23.062704.3256@cam.ac.uk> Date: Sat, 23 Dec 1995 06:27:04 GMT References: <1995Dec19.081404.5491@stanford.edu> <1995Dec21.224804.8528@utexas.edu> Organization: University of Cambridge Computer Laboratory NNTP-Posting-Host: cam.ac.uk X-Newsreader: NewsWatcher 2.0b24 Lines: 10 In article <1995Dec21.224804.8528@utexas.edu>, goliveira@utexas.edu (Graham Oliveira) writes: > Have you checked your sound card's ADC clock? Cheap Sound Blaster cards use uncalibrated ceramic resonators that drift with temperature. > PGP Public key available via finger or upon request. 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. -- === Sun-mi Ramírez === Dept of Electrical Engineering, University of Cambridge Computer Laboratory "Hold for relay." From ihughes@hanse.de Sun Dec 24 18:18:04 1995 Path: ashpoly!bigsur!pacrim!krgate!eunha!hanse!ihughes From: ihughes@hanse.de (Ines Hughes) Newsgroups: comp.dsp Subject: Re: Data: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Dec24.181804.6170@hanse.de> Date: Sun, 24 Dec 1995 18:18:04 GMT References: <1995Dec19.081404.5491@stanford.edu> <1995Dec21.224804.8528@utexas.edu> <1995Dec23.062704.3256@cam.ac.uk> Organization: Hanse-Netzwerk Hamburg NNTP-Posting-Host: hanse.de X-Newsreader: TIN [version 1.2 PL2] Lines: 10 In article <1995Dec23.062704.3256@cam.ac.uk>, sramirez@cam.ac.uk (Sun-mi Ramírez) writes: > 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. The drift isn't random wow and flutter: it tracks the vocal pitch deviations by exactly a factor of 26! If you are posting from AOL, please read RFC 1036 before posting again. -- Ines Hughes Tape trading list upon request. SASE required for international mail.