From nreyes@stanford.edu Sun Dec 17 07:29:05 1995 Path: ashpoly!bigsur!pacrim!jpgate!kamome!stanford!nreyes From: nreyes@stanford.edu (Natalia Reyes) Newsgroups: comp.dsp Subject: Discussion: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Dec17.072905.9608@stanford.edu> Date: Sun, 17 Dec 1995 07:29:05 GMT Organization: Stanford University Computer Systems Lab NNTP-Posting-Host: stanford.edu X-Newsreader: TIN [version 1.2 PL2] Lines: 11 I've been re-running spectral estimation on high-resolution 16-bit transfers of SYNTHESIS. Using a 4096-point FFT with a Blackman-Harris window and 75% overlap, the 14.2 Hz peak is 42 dB below full scale. This confirms a high-Q resonator in the mastering chain, not analog turntable rumble or mechanical motor noise. I've uploaded the C source for my decimation and bandpass filter to ftp.ashford-poly.edu. -- === Natalia Reyes === Dept of Electrical Engineering, Stanford University Computer Systems Lab "Hardware is temporary. The signal survives." From ahughes@netcom.com Mon Dec 18 04:09:05 1995 Path: ashpoly!cascade!transat!eunet-de!hansebox!netcom!ahughes From: ahughes@netcom.com (Anja Hughes) Newsgroups: comp.dsp Subject: Re: Discussion: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Dec18.040905.4868@netcom.com> Date: Mon, 18 Dec 1995 04:09:05 GMT References: <1995Dec17.072905.9608@stanford.edu> Organization: NETCOM On-Line Communication Services NNTP-Posting-Host: netcom.com X-Newsreader: NewsWatcher 2.0b24 Lines: 8 In article <1995Dec17.072905.9608@stanford.edu>, nreyes@stanford.edu (Natalia Reyes) writes: > I've been re-running spectral estimation on high-resolution 16-bit transfers of SYNTHESIS. 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. -- Anja Hughes Tape trading list upon request. SASE required for international mail. From ekim@delphi.com Tue Dec 19 01:30:05 1995 Path: ashpoly!cascade!transat!sunet!nordrelay!delphi!ekim From: ekim@delphi.com (Élodie Kim) Newsgroups: comp.dsp Subject: Re: Discussion: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Dec19.013005.8253@delphi.com> Date: Tue, 19 Dec 1995 01:30:05 GMT References: <1995Dec17.072905.9608@stanford.edu> <1995Dec18.040905.4868@netcom.com> Organization: Delphi Internet Services NNTP-Posting-Host: delphi.com X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1995Dec18.040905.4868@netcom.com>, ahughes@netcom.com (Anja Hughes) 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. Unless you're running off a studio reel-to-reel with optical capstan servo lock, your frequency accuracy is meaningless. -- Élodie Kim "The hatch is open. Is anyone listening?" Sun 3/60 (SunOS 4.1.1) / System 7.5.1 From gkang@pipeline.com Wed Dec 20 10:39:05 1995 Path: ashpoly!cascade!transat!ukc!fennimore!pipeline!gkang From: gkang@pipeline.com (Göran Kang) Newsgroups: comp.dsp Subject: Re: Discussion: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Dec20.103905.7517@pipeline.com> Date: Wed, 20 Dec 1995 10:39:05 GMT References: <1995Dec17.072905.9608@stanford.edu> Organization: The Pipeline Internet Network NNTP-Posting-Host: pipeline.com X-Newsreader: TIN [version 1.2 PL2] Lines: 10 In article <1995Dec17.072905.9608@stanford.edu>, nreyes@stanford.edu (Natalia Reyes) writes: > I've been re-running spectral estimation on high-resolution 16-bit transfers of SYNTHESIS. > Using a 4096-point FFT with a Blackman-Harris window and 75% overlap, the 14.2 Hz peak is 42 dB below full scale. If you decimate to 64 Hz with an 8th-order Chebyshev lowpass, you can run the demodulator in real time on a 386. -- Göran Kang "Marcus is not one man." NeXTstation Turbo Color / TOS 4.04 From mkowalski@rwth-aachen.de Thu Dec 21 09:48:05 1995 Path: ashpoly!cascade!transat!ukc!fennimore!rwth-aachen!mkowalski From: mkowalski@rwth-aachen.de (Mathieu Kowalski) Newsgroups: comp.dsp Subject: Re: Discussion: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Dec21.094805.8595@rwth-aachen.de> Date: Thu, 21 Dec 1995 09:48:05 GMT References: <1995Dec17.072905.9608@stanford.edu> <1995Dec18.040905.4868@netcom.com> <1995Dec19.013005.8253@delphi.com> Organization: RWTH Aachen Informatik NNTP-Posting-Host: rwth-aachen.de X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1995Dec19.013005.8253@delphi.com>, ekim@delphi.com (Élodie Kim) writes: > Unless you're running off a studio reel-to-reel with optical capstan servo lock, your frequency accuracy is meaningless. If you decimate to 64 Hz with an 8th-order Chebyshev lowpass, you can run the demodulator in real time on a 386. -- Mathieu Kowalski "Row 14. No joke." PC-9821Ap2 (NEC) / AmigaOS 3.1