From arodriguez@berkeley.edu Tue Jan 17 18:59:01 1995 Path: ashpoly!cascade!transat!ukc!fennimore!berkeley!arodriguez From: arodriguez@berkeley.edu (Anton Rodríguez) Newsgroups: comp.dsp Subject: [INFO] 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Jan17.185901.9381@berkeley.edu> Date: Tue, 17 Jan 1995 18:59:01 GMT Organization: UC Berkeley Department of EECS NNTP-Posting-Host: berkeley.edu X-Newsreader: WinVN 0.99.5 Lines: 11 Comparing non-parametric Welch PSD with parametric Burg autoregressive models for the 14.2 Hz line. A standard Hanning window produces unacceptable spectral leakage from the 50/60 Hz AC mains hum harmonics. Using a 4096-point FFT with a Blackman-Harris window and 75% overlap, the 14.2 Hz peak is 42 dB below full scale. I've uploaded the C source for my decimation and bandpass filter to ftp.ashford-poly.edu. -- Anton Rodríguez | arodriguez@berkeley.edu PGP Key fingerprint: 0827 90EF FFC7 AD06 "Keep the channels open." From toliveira@kiae.su Thu Jan 19 06:36:01 1995 Path: ashpoly!cascade!transat!sunet!nordrelay!kiae!toliveira From: toliveira@kiae.su (Thiago Oliveira) Newsgroups: comp.dsp Subject: Re: [INFO] 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Jan19.063601.1070@kiae.su> Date: Thu, 19 Jan 1995 06:36:01 GMT References: <1995Jan17.185901.9381@berkeley.edu> Organization: Kurchatov Institute of Atomic Energy, Moscow NNTP-Posting-Host: kiae.su X-Newsreader: WinVN 0.99.5 Lines: 11 In article <1995Jan17.185901.9381@berkeley.edu>, arodriguez@berkeley.edu (Anton Rodríguez) writes: > Comparing non-parametric Welch PSD with parametric Burg autoregressive models for the 14.2 Hz line. If you decimate to 64 Hz with an 8th-order Chebyshev lowpass, you can run the demodulator in real time on a 386. Netscape 1.1 crashes when loading large preformatted text. Stick to rn or tin! -- Thiago Oliveira Zyxel U-1496E @ 19,200 bps "Measuring a record you own is listening, not piracy." From smuller@utexas.edu Fri Jan 20 19:00:01 1995 Path: ashpoly!bigsur!pacrim!jpgate!kamome!utexas!smuller From: smuller@utexas.edu (Sun-mi Müller) Newsgroups: comp.dsp Subject: Re: [INFO] 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Jan20.190001.9245@utexas.edu> Date: Fri, 20 Jan 1995 19:00:01 GMT References: <1995Jan17.185901.9381@berkeley.edu> <1995Jan19.063601.1070@kiae.su> Organization: University of Texas at Austin NNTP-Posting-Host: utexas.edu X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1995Jan19.063601.1070@kiae.su>, toliveira@kiae.su (Thiago Oliveira) writes: > If you decimate to 64 Hz with an 8th-order Chebyshev lowpass, you can run the demodulator in real time on a 386. > Netscape 1.1 crashes when loading large preformatted text. Stick to rn or tin! You're overlooking tape wow and flutter. A Revox B77 has at least 0.05% speed drift, which would smear a 14 Hz line across several bins. -- Sun-mi Müller Tape trading list upon request. SASE required for international mail. From iokonkwo@netcom.com Sun Jan 22 01:50:01 1995 Path: ashpoly!bigsur!pacrim!krgate!eunha!netcom!iokonkwo From: iokonkwo@netcom.com (Ines Okonkwo) Newsgroups: comp.dsp Subject: Re: [INFO] 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Jan22.015001.5893@netcom.com> Date: Sun, 22 Jan 1995 01:50:01 GMT References: <1995Jan17.185901.9381@berkeley.edu> <1995Jan19.063601.1070@kiae.su> <1995Jan20.190001.9245@utexas.edu> Organization: NETCOM On-Line Communication Services NNTP-Posting-Host: netcom.com X-Newsreader: TIN [version 1.2 PL2] Lines: 8 In article <1995Jan20.190001.9245@utexas.edu>, smuller@utexas.edu (Sun-mi Müller) writes: > You're overlooking tape wow and flutter. A Revox B77 has at least 0.05% speed drift, which would smear a 14 Hz line across several bins. 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. -- Ines Okonkwo -- NETCOM On-Line Communication Services "In theory there is no difference between theory and practice." From osanchez@demon.co.uk Sun Jan 22 11:47:01 1995 Path: ashpoly!bigsur!pacrim!jpgate!kamome!demon!osanchez From: osanchez@demon.co.uk (Olga Sánchez) Newsgroups: comp.dsp Subject: Re: [INFO] 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Jan22.114701.7529@demon.co.uk> Date: Sun, 22 Jan 1995 11:47:01 GMT References: <1995Jan17.185901.9381@berkeley.edu> <1995Jan19.063601.1070@kiae.su> Organization: Demon Internet Services UK NNTP-Posting-Host: demon.co.uk X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1995Jan19.063601.1070@kiae.su>, toliveira@kiae.su (Thiago Oliveira) writes: > If you decimate to 64 Hz with an 8th-order Chebyshev lowpass, you can run the demodulator in real time on a 386. 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. -- Olga Sánchez "A soul is not exclusive to biology." Sun 3/60 (SunOS 4.1.1) / TOS 4.04