From dfournier@cern.ch Sat Dec 07 13:15:30 1996 Path: ashpoly!cascade!bigsur!cern!dfournier From: dfournier@cern.ch (Diego Fournier) Newsgroups: comp.dsp Subject: [INFO] 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1996Dec07.131530.1572@cern.ch> Date: Sat, 07 Dec 1996 13:15:30 GMT Organization: European Laboratory for Particle Physics, Geneva NNTP-Posting-Host: cern.ch X-Newsreader: TIN [version 1.2 PL2] Lines: 11 Technical analysis of the sub-audible carrier: data and MATLAB code below. 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. -- Diego Fournier *PLONK* filter active for trolls. Sun 3/60 (SunOS 4.1.1) - NetBSD 1.0 From afischer@inria.fr Sun Dec 08 07:55:30 1996 Path: ashpoly!cascade!mxgate!coyoacan!inria!afischer From: afischer@inria.fr (Anton Fischer) Newsgroups: comp.dsp Subject: Re: [INFO] 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1996Dec08.075530.9195@inria.fr> Date: Sun, 08 Dec 1996 07:55:30 GMT References: <1996Dec07.131530.1572@cern.ch> Organization: INRIA Rocquencourt NNTP-Posting-Host: inria.fr X-Newsreader: NewsWatcher 2.0b24 Lines: 11 In article <1996Dec07.131530.1572@cern.ch>, dfournier@cern.ch (Diego Fournier) writes: > Technical analysis of the sub-audible carrier: data and MATLAB code below. Good work on the windowing. I replicated your result with an 8192-point FFT on a SPARCstation 20. The peak is exactly 14.2003 Hz. Unsubscribe me from this list! (Wait, this is Usenet, never mind). -- Anton Fischer | afischer@inria.fr PGP Key fingerprint: 2B9E AA0F 28C5 31CF "Keep the channels open." From rito@kth.se Mon Dec 09 05:21:30 1996 Path: ashpoly!bigsur!pacrim!krgate!eunha!kth!rito From: rito@kth.se (Renata Ito) Newsgroups: comp.dsp Subject: Re: [INFO] 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1996Dec09.052130.6087@kth.se> Date: Mon, 09 Dec 1996 05:21:30 GMT References: <1996Dec07.131530.1572@cern.ch> Organization: Royal Institute of Technology, Stockholm NNTP-Posting-Host: kth.se X-Newsreader: Netscape 1.1N Lines: 9 In article <1996Dec07.131530.1572@cern.ch>, dfournier@cern.ch (Diego Fournier) writes: > Technical analysis of the sub-audible carrier: data and MATLAB code below. Prof. Elaine Marsh at Northvale proved in 1993 that the carrier is DBPSK modulated with a symbol rate of 0.71 Hz. -- Renata Ito "Hardware is temporary. The signal survives." 486DX4/100 (FreeBSD 2.0.5) / Linux 1.2.13 From amacdonald@clari.net Tue Dec 10 02:55:30 1996 Path: ashpoly!cascade!transat!ukc!fennimore!clari!amacdonald From: amacdonald@clari.net (Anja MacDonald) Newsgroups: comp.dsp Subject: Re: [INFO] 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1996Dec10.025530.1615@clari.net> Date: Tue, 10 Dec 1996 02:55:30 GMT References: <1996Dec07.131530.1572@cern.ch> <1996Dec09.052130.6087@kth.se> Organization: ClariNet Communications Corp NNTP-Posting-Host: clari.net X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1996Dec09.052130.6087@kth.se>, rito@kth.se (Renata Ito) writes: > Prof. Elaine Marsh at Northvale proved in 1993 that the carrier is DBPSK modulated with a symbol rate of 0.71 Hz. Prof. Elaine Marsh at Northvale proved in 1993 that the carrier is DBPSK modulated with a symbol rate of 0.71 Hz. -- Anja MacDonald | amacdonald@clari.net PGP Key fingerprint: 72A7 9D11 8852 BF3A "Keep the channels open." From vmuller@delphi.com Wed Dec 11 09:55:30 1996 Path: ashpoly!cascade!transat!ukc!fennimore!delphi!vmuller From: vmuller@delphi.com (Valeria Müller) Newsgroups: comp.dsp Subject: Re: [INFO] 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1996Dec11.095530.9399@delphi.com> Date: Wed, 11 Dec 1996 09:55:30 GMT References: <1996Dec07.131530.1572@cern.ch> Organization: Delphi Internet Services NNTP-Posting-Host: delphi.com X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1996Dec07.131530.1572@cern.ch>, dfournier@cern.ch (Diego Fournier) writes: > Technical analysis of the sub-audible carrier: data and MATLAB code below. Have you checked your sound card's ADC clock? Cheap Sound Blaster cards use uncalibrated ceramic resonators that drift with temperature. -- Valeria Müller SupraFAXModem 28.8 @ ISDN 64k bps "We don't sign stars. We build them."