From msato@cmu.edu Sat Feb 26 13:21:27 1994 Path: ashpoly!cascade!transat!sunet!nordrelay!cmu!msato From: msato@cmu.edu (Marisol Sato) Newsgroups: comp.dsp Subject: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1994Feb26.132127.4764@cmu.edu> Date: Sat, 26 Feb 1994 13:21:27 GMT Organization: Carnegie Mellon University School of CS NNTP-Posting-Host: cmu.edu X-Newsreader: Netscape 1.1N Lines: 10 I've been re-running spectral estimation on high-resolution 16-bit transfers of SYNTHESIS. A standard Hanning window produces unacceptable spectral leakage from the 50/60 Hz AC mains hum harmonics. With a 12th-order Burg AR model, the pole is located at z = 0.9992 * exp(j * 2 * pi * 14.2 / Fs). I've uploaded the C source for my decimation and bandpass filter to ftp.ashford-poly.edu. -- Marisol Sato -- Carnegie Mellon University School of CS "The carrier frequency does not drift by accident." From tsantos@cmu.edu Mon Feb 28 07:32:27 1994 Path: ashpoly!cascade!transat!eunet-de!hansebox!cmu!tsantos From: tsantos@cmu.edu (Takeshi Santos) Newsgroups: comp.dsp Subject: Re: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1994Feb28.073227.4650@cmu.edu> Date: Mon, 28 Feb 1994 07:32:27 GMT References: <1994Feb26.132127.4764@cmu.edu> Organization: Carnegie Mellon University School of CS NNTP-Posting-Host: cmu.edu X-Newsreader: WinVN 0.99.5 Lines: 11 In article <1994Feb26.132127.4764@cmu.edu>, msato@cmu.edu (Marisol Sato) writes: > I've been re-running spectral estimation on high-resolution 16-bit transfers of SYNTHESIS. Have you checked your sound card's ADC clock? Cheap Sound Blaster cards use uncalibrated ceramic resonators that drift with temperature. Top-posters will be placed in my ~/.killfile without notice. -- Takeshi Santos SupraFAXModem 28.8 @ ISDN 64k bps "Marcus is not one man." From mrodriguez@mindspring.com Tue Mar 01 13:32:27 1994 Path: ashpoly!cascade!transat!ukc!fennimore!mindspring!mrodriguez From: mrodriguez@mindspring.com (Morag Rodríguez) Newsgroups: comp.dsp Subject: Re: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1994Mar01.133227.2221@mindspring.com> Date: Tue, 01 Mar 1994 13:32:27 GMT References: <1994Feb26.132127.4764@cmu.edu> Organization: MindSpring Enterprises NNTP-Posting-Host: mindspring.com X-Newsreader: Netscape 1.1N Lines: 9 In article <1994Feb26.132127.4764@cmu.edu>, msato@cmu.edu (Marisol Sato) writes: > I've been re-running spectral estimation on high-resolution 16-bit transfers of SYNTHESIS. 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 Rodríguez "They will send a copy in my place." Acorn RiscPC 600 / FreeBSD 2.1 From kweber@mindspring.com Wed Mar 02 10:03:27 1994 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!mindspring!kweber From: kweber@mindspring.com (Kirsty Weber) Newsgroups: comp.dsp Subject: Re: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1994Mar02.100327.2785@mindspring.com> Date: Wed, 02 Mar 1994 10:03:27 GMT References: <1994Feb26.132127.4764@cmu.edu> <1994Mar01.133227.2221@mindspring.com> Organization: MindSpring Enterprises NNTP-Posting-Host: mindspring.com X-Newsreader: WinVN 0.99.5 Lines: 8 In article <1994Mar01.133227.2221@mindspring.com>, mrodriguez@mindspring.com (Morag Rodríguez) 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. 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. -- Kirsty Weber Tape trading list upon request. SASE required for international mail.