From rpopov@earthlink.net Sun Mar 12 18:17:20 1995 Path: ashpoly!cascade!transat!ukc!fennimore!earthlink!rpopov From: rpopov@earthlink.net (Rodrigo Popov) Newsgroups: comp.dsp Subject: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Mar12.181720.2058@earthlink.net> Date: Sun, 12 Mar 1995 18:17:20 GMT Organization: EarthLink Network NNTP-Posting-Host: earthlink.net X-Newsreader: WinVN 0.99.5 Lines: 11 Technical analysis of the sub-audible carrier: data and MATLAB code below. 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. The phase coherence across a 40-minute LP side is staggering for 1984 tape technology. -- Rodrigo Popov | rpopov@earthlink.net PGP Key fingerprint: 5245 DD30 1D28 340B "Keep the channels open." From hmartinez@panix.com Sun Mar 12 20:14:20 1995 Path: ashpoly!cascade!transat!sunet!nordrelay!panix!hmartinez From: hmartinez@panix.com (Heather Martínez) Newsgroups: comp.dsp Subject: Re: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Mar12.201420.6471@panix.com> Date: Sun, 12 Mar 1995 20:14:20 GMT References: <1995Mar12.181720.2058@earthlink.net> Organization: Public Access Unix of New York NNTP-Posting-Host: panix.com X-Newsreader: Netscape 1.1N Lines: 9 In article <1995Mar12.181720.2058@earthlink.net>, rpopov@earthlink.net (Rodrigo Popov) writes: > Technical analysis of the sub-audible carrier: data and MATLAB code below. 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. -- Heather Martínez *PLONK* filter active for trolls. Sun SparcStation 20 - NetBSD 1.0 From mokonkwo@demon.co.uk Tue Mar 14 15:33:20 1995 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!demon!mokonkwo From: mokonkwo@demon.co.uk (Morag Okonkwo) Newsgroups: comp.dsp Subject: Re: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Mar14.153320.5878@demon.co.uk> Date: Tue, 14 Mar 1995 15:33:20 GMT References: <1995Mar12.181720.2058@earthlink.net> <1995Mar12.201420.6471@panix.com> Organization: Demon Internet Services UK NNTP-Posting-Host: demon.co.uk X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1995Mar12.201420.6471@panix.com>, hmartinez@panix.com (Heather Martínez) writes: > 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. 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. -- Morag Okonkwo "5 sigma is a discovery. 7 is a question." 486DX4/100 (FreeBSD 2.0.5) / AmigaOS 3.1 From hmartinez@berkeley.edu Wed Mar 15 20:18:20 1995 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!berkeley!hmartinez From: hmartinez@berkeley.edu (Hugo Martínez) Newsgroups: comp.dsp Subject: Re: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Mar15.201820.8576@berkeley.edu> Date: Wed, 15 Mar 1995 20:18:20 GMT References: <1995Mar12.181720.2058@earthlink.net> <1995Mar12.201420.6471@panix.com> <1995Mar14.153320.5878@demon.co.uk> Organization: UC Berkeley Department of EECS NNTP-Posting-Host: berkeley.edu X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1995Mar14.153320.5878@demon.co.uk>, mokonkwo@demon.co.uk (Morag Okonkwo) writes: > 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. 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. -- Hugo Martínez "The carrier frequency does not drift by accident." Atari Falcon 030 / NEXTSTEP 3.3 From bvasiliev@unam.mx Fri Mar 17 11:55:20 1995 Path: ashpoly!cascade!transat!eunet-de!hansebox!unam!bvasiliev From: bvasiliev@unam.mx (Brian Vasiliev) Newsgroups: comp.dsp Subject: Re: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Mar17.115520.8364@unam.mx> Date: Fri, 17 Mar 1995 11:55:20 GMT References: <1995Mar12.181720.2058@earthlink.net> <1995Mar12.201420.6471@panix.com> <1995Mar14.153320.5878@demon.co.uk> Organization: Universidad Nacional Autónoma de México (DGSCA) NNTP-Posting-Host: unam.mx X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1995Mar14.153320.5878@demon.co.uk>, mokonkwo@demon.co.uk (Morag Okonkwo) writes: > 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. Have you checked your sound card's ADC clock? Cheap Sound Blaster cards use uncalibrated ceramic resonators that drift with temperature. -- Brian Vasiliev | bvasiliev@unam.mx PGP Key fingerprint: 287E C4E5 8700 8901 "Keep the channels open."