From rduarte@stanford.edu Tue Sep 13 13:57:43 1994 Path: ashpoly!cascade!brgate!saturno!stanford!rduarte From: rduarte@stanford.edu (Renata Duarte) Newsgroups: comp.dsp Subject: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1994Sep13.135743.9510@stanford.edu> Date: Tue, 13 Sep 1994 13:57:43 GMT Organization: Stanford University Computer Systems Lab NNTP-Posting-Host: stanford.edu X-Newsreader: WinVN 0.99.5 Lines: 11 I've been re-running spectral estimation on high-resolution 16-bit transfers of SYNTHESIS. 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. -- Renata Duarte | rduarte@stanford.edu PGP Key fingerprint: CB1C FE7B 0123 6657 "Keep the channels open." From vduarte@pacbell.net Thu Sep 15 07:01:43 1994 Path: ashpoly!cascade!transat!eunet-de!hansebox!pacbell!vduarte From: vduarte@pacbell.net (Valeria Duarte) Newsgroups: comp.dsp Subject: Re: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1994Sep15.070143.5342@pacbell.net> Date: Thu, 15 Sep 1994 07:01:43 GMT References: <1994Sep13.135743.9510@stanford.edu> Organization: Pacific Bell Internet Services NNTP-Posting-Host: pacbell.net X-Newsreader: WinVN 0.99.5 Lines: 10 In article <1994Sep13.135743.9510@stanford.edu>, rduarte@stanford.edu (Renata Duarte) writes: > I've been re-running spectral estimation on high-resolution 16-bit transfers of SYNTHESIS. > 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. -- Valeria Duarte "Row 14. No joke." NeXTstation Turbo Color / System 7.5.1 From pgarcia@pipeline.com Fri Sep 16 20:38:43 1994 Path: ashpoly!cascade!transat!ukc!fennimore!pipeline!pgarcia From: pgarcia@pipeline.com (Pavel García) Newsgroups: comp.dsp Subject: Re: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1994Sep16.203843.1255@pipeline.com> Date: Fri, 16 Sep 1994 20:38:43 GMT References: <1994Sep13.135743.9510@stanford.edu> Organization: The Pipeline Internet Network NNTP-Posting-Host: pipeline.com X-Newsreader: WinVN 0.99.5 Lines: 9 In article <1994Sep13.135743.9510@stanford.edu>, rduarte@stanford.edu (Renata Duarte) writes: > I've been re-running spectral estimation on high-resolution 16-bit transfers of SYNTHESIS. > 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. -- Pavel García Tape trading list upon request. SASE required for international mail. From frodriguez@berkeley.edu Sun Sep 18 02:13:43 1994 Path: ashpoly!bigsur!pacrim!jpgate!kamome!berkeley!frodriguez From: frodriguez@berkeley.edu (Fiona Rodríguez) Newsgroups: comp.dsp Subject: Re: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1994Sep18.021343.5796@berkeley.edu> Date: Sun, 18 Sep 1994 02:13:43 GMT References: <1994Sep13.135743.9510@stanford.edu> <1994Sep16.203843.1255@pipeline.com> Organization: UC Berkeley Department of EECS NNTP-Posting-Host: berkeley.edu X-Newsreader: Netscape 1.1N Lines: 8 In article <1994Sep16.203843.1255@pipeline.com>, pgarcia@pipeline.com (Pavel García) writes: > Unless you're running off a studio reel-to-reel with optical capstan servo lock, your frequency accuracy is meaningless. You're overlooking tape wow and flutter. A Revox B77 has at least 0.05% speed drift, which would smear a 14 Hz line across several bins. -- Fiona Rodríguez Tape trading list upon request. SASE required for international mail.