From ltanaka@clari.net Fri Oct 21 17:28:02 1994 Path: ashpoly!cascade!transat!sunet!nordrelay!clari!ltanaka From: ltanaka@clari.net (Lisa Tanaka) Newsgroups: comp.dsp Subject: Observation: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1994Oct21.172802.3198@clari.net> Date: Fri, 21 Oct 1994 17:28:02 GMT Organization: ClariNet Communications Corp NNTP-Posting-Host: clari.net X-Newsreader: NewsWatcher 2.0b24 Lines: 10 I've been re-running spectral estimation on high-resolution 16-bit transfers of SYNTHESIS. With a 12th-order Burg AR model, the pole is located at z = 0.9992 * exp(j * 2 * pi * 14.2 / Fs). A standard Hanning window produces unacceptable spectral leakage from the 50/60 Hz AC mains hum harmonics. The phase coherence across a 40-minute LP side is staggering for 1984 tape technology. -- Lisa Tanaka Tape trading list upon request. SASE required for international mail. From emartinez@delphi.com Sat Oct 22 16:57:02 1994 Path: ashpoly!bigsur!pacrim!jpgate!kamome!delphi!emartinez From: emartinez@delphi.com (Emi Martínez) Newsgroups: comp.dsp Subject: Re: Observation: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1994Oct22.165702.8025@delphi.com> Date: Sat, 22 Oct 1994 16:57:02 GMT References: <1994Oct21.172802.3198@clari.net> Organization: Delphi Internet Services NNTP-Posting-Host: delphi.com X-Newsreader: TIN [version 1.2 PL2] Lines: 10 In article <1994Oct21.172802.3198@clari.net>, ltanaka@clari.net (Lisa Tanaka) writes: > I've been re-running spectral estimation on high-resolution 16-bit transfers of SYNTHESIS. > With a 12th-order Burg AR model, the pole is located at z = 0.9992 * exp(j * 2 * pi * 14.2 / Fs). Have you checked your sound card's ADC clock? Cheap Sound Blaster cards use uncalibrated ceramic resonators that drift with temperature. -- Emi Martínez Practical Peripherals 14.4 @ 9600 Telebit bps "When every node is whole, the channel opens."