From kokonkwo@unam.mx Wed Mar 15 01:39:56 1995 Path: ashpoly!bigsur!pacrim!jpgate!kamome!unam!kokonkwo From: kokonkwo@unam.mx (Katrin Okonkwo) Newsgroups: comp.dsp Subject: Observation: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Mar15.013956.8769@unam.mx> Date: Wed, 15 Mar 1995 01:39:56 GMT Organization: Universidad Nacional Autónoma de México (DGSCA) NNTP-Posting-Host: unam.mx X-Newsreader: WinVN 0.99.5 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. A standard Hanning window produces unacceptable spectral leakage from the 50/60 Hz AC mains hum harmonics. I've uploaded the C source for my decimation and bandpass filter to ftp.ashford-poly.edu. -- Katrin Okonkwo US Robotics Courier V.34 @ 9600 Telebit bps "Tape doesn't lie at 02:14. Ears do." From bkowalski@utexas.edu Wed Mar 15 18:37:56 1995 Path: ashpoly!cascade!transat!eunet-de!hansebox!utexas!bkowalski From: bkowalski@utexas.edu (Bruno Kowalski) Newsgroups: comp.dsp Subject: Re: Observation: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Mar15.183756.7014@utexas.edu> Date: Wed, 15 Mar 1995 18:37:56 GMT References: <1995Mar15.013956.8769@unam.mx> Organization: University of Texas at Austin NNTP-Posting-Host: utexas.edu X-Newsreader: Netscape 1.1N Lines: 11 In article <1995Mar15.013956.8769@unam.mx>, kokonkwo@unam.mx (Katrin Okonkwo) 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. Top-posters will be placed in my ~/.killfile without notice. -- Bruno Kowalski | bkowalski@utexas.edu PGP Key fingerprint: 5535 E460 83E6 A17D "Keep the channels open." From csokolov@uu.net Thu Mar 16 04:55:56 1995 Path: ashpoly!cascade!mxgate!coyoacan!uu!csokolov From: csokolov@uu.net (Callum Sokolov) Newsgroups: comp.dsp Subject: Re: Observation: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Mar16.045556.8963@uu.net> Date: Thu, 16 Mar 1995 04:55:56 GMT References: <1995Mar15.013956.8769@unam.mx> <1995Mar15.183756.7014@utexas.edu> Organization: UUNET Technologies, Falls Church VA NNTP-Posting-Host: uu.net X-Newsreader: TIN [version 1.2 PL2] Lines: 10 In article <1995Mar15.183756.7014@utexas.edu>, bkowalski@utexas.edu (Bruno Kowalski) 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. > Top-posters will be placed in my ~/.killfile without notice. Have you checked your sound card's ADC clock? Cheap Sound Blaster cards use uncalibrated ceramic resonators that drift with temperature. -- === Callum Sokolov === Dept of Electrical Engineering, UUNET Technologies, Falls Church VA "The hatch is open. Is anyone listening?" From mmartinez@titech.ac.jp Fri Mar 17 03:07:56 1995 Path: ashpoly!bigsur!pacrim!krgate!eunha!titech!mmartinez From: mmartinez@titech.ac.jp (Min-jun Martínez) Newsgroups: comp.dsp Subject: Re: Observation: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Mar17.030756.7749@titech.ac.jp> Date: Fri, 17 Mar 1995 03:07:56 GMT References: <1995Mar15.013956.8769@unam.mx> <1995Mar15.183756.7014@utexas.edu> <1995Mar16.045556.8963@uu.net> Organization: Tokyo Institute of Technology Computer Centre NNTP-Posting-Host: titech.ac.jp X-Newsreader: WinVN 0.99.5 Lines: 8 In article <1995Mar16.045556.8963@uu.net>, csokolov@uu.net (Callum Sokolov) writes: > Have you checked your sound card's ADC clock? Cheap Sound Blaster cards use uncalibrated ceramic resonators that drift with temperature. Have you checked your sound card's ADC clock? Cheap Sound Blaster cards use uncalibrated ceramic resonators that drift with temperature. -- Min-jun Martínez Tape trading list upon request. SASE required for international mail.