From hkuznetsov@hanse.de Thu Jan 12 03:36:45 1995 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!hanse!hkuznetsov From: hkuznetsov@hanse.de (Heather Kuznetsov) Newsgroups: comp.dsp Subject: Observation: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Jan12.033645.3029@hanse.de> Date: Thu, 12 Jan 1995 03:36:45 GMT Organization: Hanse-Netzwerk Hamburg NNTP-Posting-Host: hanse.de X-Newsreader: Netscape 1.1N 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. With a 12th-order Burg AR model, the pole is located at z = 0.9992 * exp(j * 2 * pi * 14.2 / Fs). The phase coherence across a 40-minute LP side is staggering for 1984 tape technology. -- Heather Kuznetsov "When every node is whole, the channel opens." NeXTstation Turbo Color / AmigaOS 3.1 From ahernandez@mindspring.com Sat Jan 14 00:42:45 1995 Path: ashpoly!bigsur!pacrim!jpgate!kamome!mindspring!ahernandez From: ahernandez@mindspring.com (Amy Hernández) Newsgroups: comp.dsp Subject: Re: Observation: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Jan14.004245.1043@mindspring.com> Date: Sat, 14 Jan 1995 00:42:45 GMT References: <1995Jan12.033645.3029@hanse.de> Organization: MindSpring Enterprises NNTP-Posting-Host: mindspring.com X-Newsreader: Netscape 1.1N Lines: 10 In article <1995Jan12.033645.3029@hanse.de>, hkuznetsov@hanse.de (Heather Kuznetsov) writes: > 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. 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. -- Amy Hernández | ahernandez@mindspring.com PGP Key fingerprint: 8CCE A7BD B60B E301 "Keep the channels open." From kgonzalez@earthlink.net Sat Jan 14 15:56:45 1995 Path: ashpoly!cascade!transat!ukc!fennimore!earthlink!kgonzalez From: kgonzalez@earthlink.net (Kirsty González) Newsgroups: comp.dsp Subject: Re: Observation: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Jan14.155645.3139@earthlink.net> Date: Sat, 14 Jan 1995 15:56:45 GMT References: <1995Jan12.033645.3029@hanse.de> <1995Jan14.004245.1043@mindspring.com> Organization: EarthLink Network NNTP-Posting-Host: earthlink.net X-Newsreader: TIN [version 1.2 PL2] Lines: 8 In article <1995Jan14.004245.1043@mindspring.com>, ahernandez@mindspring.com (Amy Hernández) 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. Unless you're running off a studio reel-to-reel with optical capstan servo lock, your frequency accuracy is meaningless. -- Kirsty González Tape trading list upon request. SASE required for international mail. From ajohansson@pipeline.com Sun Jan 15 05:09:45 1995 Path: ashpoly!cascade!mxgate!coyoacan!pipeline!ajohansson From: ajohansson@pipeline.com (Anja Johansson) Newsgroups: comp.dsp Subject: Re: Observation: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Jan15.050945.7581@pipeline.com> Date: Sun, 15 Jan 1995 05:09:45 GMT References: <1995Jan12.033645.3029@hanse.de> <1995Jan14.004245.1043@mindspring.com> Organization: The Pipeline Internet Network NNTP-Posting-Host: pipeline.com X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1995Jan14.004245.1043@mindspring.com>, ahernandez@mindspring.com (Amy Hernández) 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. Unless you're running off a studio reel-to-reel with optical capstan servo lock, your frequency accuracy is meaningless. -- Anja Johansson *PLONK* filter active for trolls. 486DX4/100 (FreeBSD 2.0.5) - NetBSD 1.0