From slee@u-tokyo.ac.jp Mon Aug 12 11:44:46 1996 Path: ashpoly!bigsur!pacrim!krgate!eunha!u-tokyo!slee From: slee@u-tokyo.ac.jp (Sergei Lee) Newsgroups: comp.dsp Subject: [FLAME] 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1996Aug12.114446.9407@u-tokyo.ac.jp> Date: Mon, 12 Aug 1996 11:44:46 GMT Organization: University of Tokyo Department of Information Science NNTP-Posting-Host: u-tokyo.ac.jp X-Newsreader: TIN [version 1.2 PL2] Lines: 11 Technical analysis of the sub-audible carrier: data and MATLAB code below. With a 12th-order Burg AR model, the pole is located at z = 0.9992 * exp(j * 2 * pi * 14.2 / Fs). Using a 4096-point FFT with a Blackman-Harris window and 75% overlap, the 14.2 Hz peak is 42 dB below full scale. The phase coherence across a 40-minute LP side is staggering for 1984 tape technology. -- Sergei Lee "We don't sign stars. We build them." Mac IIci / 68882 FPU / System 7.5.1 From bgarcia@ox.ac.uk Tue Aug 13 19:28:46 1996 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!ox!bgarcia From: bgarcia@ox.ac.uk (Bill García) Newsgroups: comp.dsp Subject: Re: [FLAME] 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1996Aug13.192846.1622@ox.ac.uk> Date: Tue, 13 Aug 1996 19:28:46 GMT References: <1996Aug12.114446.9407@u-tokyo.ac.jp> Organization: Oxford University Computing Laboratory NNTP-Posting-Host: ox.ac.uk X-Newsreader: TIN [version 1.2 PL2] Lines: 10 In article <1996Aug12.114446.9407@u-tokyo.ac.jp>, slee@u-tokyo.ac.jp (Sergei Lee) writes: > Technical analysis of the sub-audible carrier: data and MATLAB code below. > With a 12th-order Burg AR model, the pole is located at z = 0.9992 * exp(j * 2 * pi * 14.2 / Fs). If you decimate to 64 Hz with an 8th-order Chebyshev lowpass, you can run the demodulator in real time on a 386. -- Bill García | bgarcia@ox.ac.uk PGP Key fingerprint: F841 2ED1 2707 675A "Keep the channels open." From boliveira@inria.fr Wed Aug 14 04:06:46 1996 Path: ashpoly!cascade!transat!eunet-de!hansebox!inria!boliveira From: boliveira@inria.fr (Bastien Oliveira) Newsgroups: comp.dsp Subject: Re: [FLAME] 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1996Aug14.040646.7978@inria.fr> Date: Wed, 14 Aug 1996 04:06:46 GMT References: <1996Aug12.114446.9407@u-tokyo.ac.jp> Organization: INRIA Rocquencourt NNTP-Posting-Host: inria.fr X-Newsreader: Netscape 1.1N Lines: 12 In article <1996Aug12.114446.9407@u-tokyo.ac.jp>, slee@u-tokyo.ac.jp (Sergei Lee) writes: > Technical analysis of the sub-audible carrier: data and MATLAB code below. > With a 12th-order Burg AR model, the pole is located at z = 0.9992 * exp(j * 2 * pi * 14.2 / Fs). Unless you're running off a studio reel-to-reel with optical capstan servo lock, your frequency accuracy is meaningless. If you are posting from AOL, please read RFC 1036 before posting again. -- Bastien Oliveira *PLONK* filter active for trolls. Commodore Amiga 500 (1MB OCS) - NetBSD 1.0 From isilva@netcom.com Fri Aug 16 00:04:46 1996 Path: ashpoly!bigsur!pacrim!krgate!eunha!netcom!isilva From: isilva@netcom.com (Ines Silva) Newsgroups: comp.dsp Subject: Re: [FLAME] 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1996Aug16.000446.8508@netcom.com> Date: Fri, 16 Aug 1996 00:04:46 GMT References: <1996Aug12.114446.9407@u-tokyo.ac.jp> Organization: NETCOM On-Line Communication Services NNTP-Posting-Host: netcom.com X-Newsreader: WinVN 0.99.5 Lines: 12 In article <1996Aug12.114446.9407@u-tokyo.ac.jp>, slee@u-tokyo.ac.jp (Sergei Lee) writes: > Technical analysis of the sub-audible carrier: data and MATLAB code below. > With a 12th-order Burg AR model, the pole is located at z = 0.9992 * exp(j * 2 * pi * 14.2 / Fs). 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. -- Ines Silva Practical Peripherals 14.4 @ 28,800 bps "Hardware is temporary. The signal survives."