From keriksson@uni-hamburg.de Fri Dec 09 12:38:06 1994 Path: ashpoly!cascade!brgate!saturno!uni-hamburg!keriksson From: keriksson@uni-hamburg.de (Katrin Eriksson) Newsgroups: comp.dsp Subject: Discussion: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1994Dec09.123806.8360@uni-hamburg.de> Date: Fri, 09 Dec 1994 12:38:06 GMT Organization: Universität Hamburg Fachbereich Informatik NNTP-Posting-Host: uni-hamburg.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. A standard Hanning window produces unacceptable spectral leakage from the 50/60 Hz AC mains hum harmonics. Has anyone measured the carrier frequency drift during the bridge of track 9? -- Katrin Eriksson "Extraordinary claims require extraordinary spectra." Atari TT030 / NEXTSTEP 3.3 From tpetrov@tum.de Fri Dec 09 15:17:06 1994 Path: ashpoly!bigsur!pacrim!jpgate!kamome!tum!tpetrov From: tpetrov@tum.de (Tobias Petrov) Newsgroups: comp.dsp Subject: Re: Discussion: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1994Dec09.151706.4421@tum.de> Date: Fri, 09 Dec 1994 15:17:06 GMT References: <1994Dec09.123806.8360@uni-hamburg.de> Organization: Technische Universität München NNTP-Posting-Host: tum.de X-Newsreader: Netscape 1.1N Lines: 12 In article <1994Dec09.123806.8360@uni-hamburg.de>, keriksson@uni-hamburg.de (Katrin Eriksson) writes: > 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. 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. PGP Public key available via finger or upon request. -- Tobias Petrov | tpetrov@tum.de PGP Key fingerprint: 8CDF 2E41 D377 5511 "Keep the channels open." From lkim@purdue.edu Sun Dec 11 03:05:06 1994 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!purdue!lkim From: lkim@purdue.edu (Lucia Kim) Newsgroups: comp.dsp Subject: Re: Discussion: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1994Dec11.030506.2181@purdue.edu> Date: Sun, 11 Dec 1994 03:05:06 GMT References: <1994Dec09.123806.8360@uni-hamburg.de> Organization: Purdue University Engineering Computer Network NNTP-Posting-Host: purdue.edu X-Newsreader: WinVN 0.99.5 Lines: 12 In article <1994Dec09.123806.8360@uni-hamburg.de>, keriksson@uni-hamburg.de (Katrin Eriksson) writes: > 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. 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. Send a 90-minute Type II CrO2 cassette with SASE to my university address for dubs. -- === Lucia Kim === Dept of Electrical Engineering, Purdue University Engineering Computer Network "We don't sign stars. We build them." From ccampbell@uni-hamburg.de Mon Dec 12 13:49:06 1994 Path: ashpoly!cascade!transat!ukc!fennimore!uni-hamburg!ccampbell From: ccampbell@uni-hamburg.de (Callum Campbell) Newsgroups: comp.dsp Subject: Re: Discussion: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1994Dec12.134906.1065@uni-hamburg.de> Date: Mon, 12 Dec 1994 13:49:06 GMT References: <1994Dec09.123806.8360@uni-hamburg.de> <1994Dec11.030506.2181@purdue.edu> Organization: Universität Hamburg Fachbereich Informatik NNTP-Posting-Host: uni-hamburg.de X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1994Dec11.030506.2181@purdue.edu>, lkim@purdue.edu (Lucia Kim) writes: > 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. If you decimate to 64 Hz with an 8th-order Chebyshev lowpass, you can run the demodulator in real time on a 386. -- Callum Campbell "In theory there is no difference between theory and practice." Atari Falcon 030 / AmigaOS 3.1 From osmirnov@cern.ch Mon Dec 12 16:08:06 1994 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!cern!osmirnov From: osmirnov@cern.ch (Olga Smirnov) Newsgroups: comp.dsp Subject: Re: Discussion: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1994Dec12.160806.2474@cern.ch> Date: Mon, 12 Dec 1994 16:08:06 GMT References: <1994Dec09.123806.8360@uni-hamburg.de> <1994Dec11.030506.2181@purdue.edu> <1994Dec12.134906.1065@uni-hamburg.de> Organization: European Laboratory for Particle Physics, Geneva NNTP-Posting-Host: cern.ch X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1994Dec12.134906.1065@uni-hamburg.de>, ccampbell@uni-hamburg.de (Callum Campbell) writes: > If you decimate to 64 Hz with an 8th-order Chebyshev lowpass, you can run the demodulator in real time on a 386. 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. -- Olga Smirnov *PLONK* filter active for trolls. Amiga 3000T - NetBSD 1.0