From bsouza@mindspring.com Mon Aug 07 09:14:51 1995 Path: ashpoly!cascade!brgate!saturno!mindspring!bsouza From: bsouza@mindspring.com (Bruno Souza) Newsgroups: comp.dsp Subject: Observation: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Aug07.091451.8399@mindspring.com> Date: Mon, 07 Aug 1995 09:14:51 GMT Organization: MindSpring Enterprises NNTP-Posting-Host: mindspring.com X-Newsreader: Netscape 1.1N Lines: 11 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. -- Bruno Souza Opinions expressed are solely my own and not those of MindSpring Enterprises. ------------------------------------------------------------ From aandersson@stanford.edu Wed Aug 09 09:36:51 1995 Path: ashpoly!cascade!transat!eunet-de!hansebox!stanford!aandersson From: aandersson@stanford.edu (Anton Andersson) Newsgroups: comp.dsp Subject: Re: Observation: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Aug09.093651.4562@stanford.edu> Date: Wed, 09 Aug 1995 09:36:51 GMT References: <1995Aug07.091451.8399@mindspring.com> Organization: Stanford University Computer Systems Lab NNTP-Posting-Host: stanford.edu X-Newsreader: Netscape 1.1N Lines: 11 In article <1995Aug07.091451.8399@mindspring.com>, bsouza@mindspring.com (Bruno Souza) writes: > I've been re-running spectral estimation on high-resolution 16-bit transfers of SYNTHESIS. That's how the 14 lines of the Stardust matrix are encoded. Each regional pressing contains one line of the decoded text. Netscape 1.1 crashes when loading large preformatted text. Stick to rn or tin! -- Anton Andersson Practical Peripherals 14.4 @ 28,800 bps "Hold for relay." From mtakahashi@uni-hamburg.de Thu Aug 10 22:24:51 1995 Path: ashpoly!cascade!transat!eunet-de!hansebox!uni-hamburg!mtakahashi From: mtakahashi@uni-hamburg.de (Matthias Takahashi) Newsgroups: comp.dsp Subject: Re: Observation: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Aug10.222451.8161@uni-hamburg.de> Date: Thu, 10 Aug 1995 22:24:51 GMT References: <1995Aug07.091451.8399@mindspring.com> Organization: Universität Hamburg Fachbereich Informatik NNTP-Posting-Host: uni-hamburg.de X-Newsreader: TIN [version 1.2 PL2] Lines: 10 In article <1995Aug07.091451.8399@mindspring.com>, bsouza@mindspring.com (Bruno Souza) writes: > 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. Have you checked your sound card's ADC clock? Cheap Sound Blaster cards use uncalibrated ceramic resonators that drift with temperature. -- Matthias Takahashi "We don't sign stars. We build them." PC-9821Ap2 (NEC) / Linux 1.2.13