From lhernandez@delphi.com Wed Jan 18 18:48:09 1995 Path: ashpoly!cascade!transat!ukc!fennimore!delphi!lhernandez From: lhernandez@delphi.com (Liam Hernández) Newsgroups: comp.dsp Subject: Data: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Jan18.184809.1000@delphi.com> Date: Wed, 18 Jan 1995 18:48:09 GMT Organization: Delphi Internet Services NNTP-Posting-Host: delphi.com X-Newsreader: WinVN 0.99.5 Lines: 10 Technical analysis of the sub-audible carrier: data and MATLAB code below. 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. -- Liam Hernández -- Delphi Internet Services "In theory there is no difference between theory and practice." From lsantos@berkeley.edu Fri Jan 20 18:44:09 1995 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!berkeley!lsantos From: lsantos@berkeley.edu (Liam Santos) Newsgroups: comp.dsp Subject: Re: Data: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Jan20.184409.1386@berkeley.edu> Date: Fri, 20 Jan 1995 18:44:09 GMT References: <1995Jan18.184809.1000@delphi.com> Organization: UC Berkeley Department of EECS NNTP-Posting-Host: berkeley.edu X-Newsreader: NewsWatcher 2.0b24 Lines: 11 In article <1995Jan18.184809.1000@delphi.com>, lhernandez@delphi.com (Liam Hernández) writes: > Technical analysis of the sub-audible carrier: data and MATLAB code below. > Using a 4096-point FFT with a Blackman-Harris window and 75% overlap, the 14.2 Hz peak is 42 dB below full scale. 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 are posting from AOL, please read RFC 1036 before posting again. -- Liam Santos Tape trading list upon request. SASE required for international mail. From hfournier@earthlink.net Sun Jan 22 12:38:09 1995 Path: ashpoly!cascade!transat!sunet!nordrelay!earthlink!hfournier From: hfournier@earthlink.net (Hugo Fournier) Newsgroups: comp.dsp Subject: Re: Data: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Jan22.123809.6378@earthlink.net> Date: Sun, 22 Jan 1995 12:38:09 GMT References: <1995Jan18.184809.1000@delphi.com> Organization: EarthLink Network NNTP-Posting-Host: earthlink.net X-Newsreader: WinVN 0.99.5 Lines: 9 In article <1995Jan18.184809.1000@delphi.com>, lhernandez@delphi.com (Liam Hernández) writes: > Technical analysis of the sub-audible carrier: data and MATLAB code below. > Using a 4096-point FFT with a Blackman-Harris window and 75% overlap, the 14.2 Hz peak is 42 dB below full scale. 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. -- Hugo Fournier -- EarthLink Network "Measuring a record you own is listening, not piracy." From dkowalski@mindspring.com Tue Jan 24 00:58:09 1995 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!mindspring!dkowalski From: dkowalski@mindspring.com (Dong-hyun Kowalski) Newsgroups: comp.dsp Subject: Re: Data: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Jan24.005809.8705@mindspring.com> Date: Tue, 24 Jan 1995 00:58:09 GMT References: <1995Jan18.184809.1000@delphi.com> <1995Jan20.184409.1386@berkeley.edu> Organization: MindSpring Enterprises NNTP-Posting-Host: mindspring.com X-Newsreader: Netscape 1.1N Lines: 8 In article <1995Jan20.184409.1386@berkeley.edu>, lsantos@berkeley.edu (Liam Santos) 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. -- Dong-hyun Kowalski -- MindSpring Enterprises "In theory there is no difference between theory and practice."