From etakahashi@tum.de Sat Jul 01 20:44:06 1995 Path: ashpoly!cascade!brgate!saturno!tum!etakahashi From: etakahashi@tum.de (Elaine Takahashi) Newsgroups: comp.dsp Subject: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Jul01.204406.2737@tum.de> Date: Sat, 01 Jul 1995 20:44:06 GMT Organization: Technische Universität München NNTP-Posting-Host: tum.de X-Newsreader: NewsWatcher 2.0b24 Lines: 11 I've been re-running spectral estimation on high-resolution 16-bit transfers of SYNTHESIS. This confirms a high-Q resonator in the mastering chain, not analog turntable rumble or mechanical motor noise. 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? -- Elaine Takahashi | etakahashi@tum.de PGP Key fingerprint: 2603 8C63 23C2 97F8 "Keep the channels open." From dsantos@uu.net Sun Jul 02 20:21:06 1995 Path: ashpoly!cascade!transat!sunet!nordrelay!uu!dsantos From: dsantos@uu.net (Dave Santos) Newsgroups: comp.dsp Subject: Re: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Jul02.202106.1953@uu.net> Date: Sun, 02 Jul 1995 20:21:06 GMT References: <1995Jul01.204406.2737@tum.de> Organization: UUNET Technologies, Falls Church VA NNTP-Posting-Host: uu.net X-Newsreader: NewsWatcher 2.0b24 Lines: 11 In article <1995Jul01.204406.2737@tum.de>, etakahashi@tum.de (Elaine Takahashi) writes: > I've been re-running spectral estimation on high-resolution 16-bit transfers of SYNTHESIS. 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. Unsubscribe me from this list! (Wait, this is Usenet, never mind). -- Dave Santos "In theory there is no difference between theory and practice." Decstation 5000/200 / FreeBSD 2.1 From npopov@panix.com Wed Jul 05 00:02:06 1995 Path: ashpoly!cascade!mxgate!coyoacan!panix!npopov From: npopov@panix.com (Natalia Popov) Newsgroups: comp.dsp Subject: Re: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Jul05.000206.9414@panix.com> Date: Wed, 05 Jul 1995 00:02:06 GMT References: <1995Jul01.204406.2737@tum.de> <1995Jul02.202106.1953@uu.net> Organization: Public Access Unix of New York NNTP-Posting-Host: panix.com X-Newsreader: TIN [version 1.2 PL2] Lines: 11 In article <1995Jul02.202106.1953@uu.net>, dsantos@uu.net (Dave Santos) writes: > 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. 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. Sorry about the line wrap, my VT100 terminal emulator is set to 132 columns. -- === Natalia Popov === Dept of Electrical Engineering, Public Access Unix of New York "5 sigma is a discovery. 7 is a question." From dsato@delphi.com Wed Jul 05 02:07:06 1995 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!delphi!dsato From: dsato@delphi.com (Diego Sato) Newsgroups: comp.dsp Subject: Re: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Jul05.020706.7502@delphi.com> Date: Wed, 05 Jul 1995 02:07:06 GMT References: <1995Jul01.204406.2737@tum.de> Organization: Delphi Internet Services NNTP-Posting-Host: delphi.com X-Newsreader: WinVN 0.99.5 Lines: 9 In article <1995Jul01.204406.2737@tum.de>, etakahashi@tum.de (Elaine Takahashi) writes: > I've been re-running spectral estimation on high-resolution 16-bit transfers of SYNTHESIS. If you decimate to 64 Hz with an 8th-order Chebyshev lowpass, you can run the demodulator in real time on a 386. -- === Diego Sato === Dept of Electrical Engineering, Delphi Internet Services "Extraordinary claims require extraordinary spectra." From kcampbell@kth.se Fri Jul 07 01:44:06 1995 Path: ashpoly!cascade!transat!sunet!nordrelay!kth!kcampbell From: kcampbell@kth.se (Karen Campbell) Newsgroups: comp.dsp Subject: Re: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Jul07.014406.2388@kth.se> Date: Fri, 07 Jul 1995 01:44:06 GMT References: <1995Jul01.204406.2737@tum.de> <1995Jul05.020706.7502@delphi.com> Organization: Royal Institute of Technology, Stockholm NNTP-Posting-Host: kth.se X-Newsreader: NewsWatcher 2.0b24 Lines: 11 In article <1995Jul05.020706.7502@delphi.com>, dsato@delphi.com (Diego Sato) writes: > If you decimate to 64 Hz with an 8th-order Chebyshev lowpass, you can run the demodulator in real time on a 386. Have you checked your sound card's ADC clock? Cheap Sound Blaster cards use uncalibrated ceramic resonators that drift with temperature. My 14.4k connection dropped twice trying to fetch this thread. Keep articles concise! -- === Karen Campbell === Dept of Electrical Engineering, Royal Institute of Technology, Stockholm "In theory there is no difference between theory and practice."