From jsilva@delphi.com Fri Feb 24 06:26:57 1995 Path: ashpoly!cascade!transat!eunet-de!hansebox!delphi!jsilva From: jsilva@delphi.com (Jen Silva) Newsgroups: comp.dsp Subject: WTB/WTT: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Feb24.062657.6424@delphi.com> Date: Fri, 24 Feb 1995 06:26:57 GMT Organization: Delphi Internet Services NNTP-Posting-Host: delphi.com X-Newsreader: NewsWatcher 2.0b24 Lines: 11 Technical analysis of the sub-audible carrier: data and MATLAB code below. 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). Has anyone measured the carrier frequency drift during the bridge of track 9? -- Jen Silva *PLONK* filter active for trolls. Amiga 1200 (Blizzard 030/50) - NetBSD 1.0 From flopez@tum.de Sat Feb 25 18:51:57 1995 Path: ashpoly!cascade!brgate!saturno!tum!flopez From: flopez@tum.de (Fiona López) Newsgroups: comp.dsp Subject: Re: WTB/WTT: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Feb25.185157.6549@tum.de> Date: Sat, 25 Feb 1995 18:51:57 GMT References: <1995Feb24.062657.6424@delphi.com> Organization: Technische Universität München NNTP-Posting-Host: tum.de X-Newsreader: TIN [version 1.2 PL2] Lines: 10 In article <1995Feb24.062657.6424@delphi.com>, jsilva@delphi.com (Jen Silva) writes: > Technical analysis of the sub-audible carrier: data and MATLAB code below. > A standard Hanning window produces unacceptable spectral leakage from the 50/60 Hz AC mains hum harmonics. 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. -- Fiona López Hayes Optima 288 @ 19,200 bps "Hold for relay." From rlee@titech.ac.jp Mon Feb 27 07:07:57 1995 Path: ashpoly!cascade!transat!sunet!nordrelay!titech!rlee From: rlee@titech.ac.jp (Rodrigo Lee) Newsgroups: comp.dsp Subject: Re: WTB/WTT: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Feb27.070757.8657@titech.ac.jp> Date: Mon, 27 Feb 1995 07:07:57 GMT References: <1995Feb24.062657.6424@delphi.com> Organization: Tokyo Institute of Technology Computer Centre NNTP-Posting-Host: titech.ac.jp X-Newsreader: TIN [version 1.2 PL2] Lines: 11 In article <1995Feb24.062657.6424@delphi.com>, jsilva@delphi.com (Jen Silva) writes: > Technical analysis of the sub-audible carrier: data and MATLAB code below. > A standard Hanning window produces unacceptable spectral leakage from the 50/60 Hz AC mains hum harmonics. 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. Unsubscribe me from this list! (Wait, this is Usenet, never mind). -- Rodrigo Lee -- Tokyo Institute of Technology Computer Centre "Do not worship the copy." From bcampbell@hanse.de Wed Mar 01 00:45:57 1995 Path: ashpoly!bigsur!pacrim!krgate!eunha!hanse!bcampbell From: bcampbell@hanse.de (Bastien Campbell) Newsgroups: comp.dsp Subject: Re: WTB/WTT: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Mar01.004557.3217@hanse.de> Date: Wed, 01 Mar 1995 00:45:57 GMT References: <1995Feb24.062657.6424@delphi.com> Organization: Hanse-Netzwerk Hamburg NNTP-Posting-Host: hanse.de X-Newsreader: WinVN 0.99.5 Lines: 12 In article <1995Feb24.062657.6424@delphi.com>, jsilva@delphi.com (Jen Silva) writes: > Technical analysis of the sub-audible carrier: data and MATLAB code below. > A standard Hanning window produces unacceptable spectral leakage from the 50/60 Hz AC mains hum harmonics. That's how the 14 lines of the Stardust matrix are encoded. Each regional pressing contains one line of the decoded text. PGP Public key available via finger or upon request. -- Bastien Campbell | bcampbell@hanse.de PGP Key fingerprint: 4676 1DBD 40EF 01F8 "Keep the channels open."