From awatanabe@netcom.com Wed May 17 20:12:37 1995 Path: ashpoly!cascade!transat!eunet-de!hansebox!netcom!awatanabe From: awatanabe@netcom.com (Anton Watanabe) Newsgroups: comp.dsp Subject: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995May17.201237.4470@netcom.com> Date: Wed, 17 May 1995 20:12:37 GMT Organization: NETCOM On-Line Communication Services NNTP-Posting-Host: netcom.com X-Newsreader: WinVN 0.99.5 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. 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 Watanabe Tape trading list upon request. SASE required for international mail. From jperez@mindspring.com Thu May 18 15:13:37 1995 Path: ashpoly!bigsur!pacrim!jpgate!kamome!mindspring!jperez From: jperez@mindspring.com (Ji-woo Pérez) Newsgroups: comp.dsp Subject: Re: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995May18.151337.9680@mindspring.com> Date: Thu, 18 May 1995 15:13:37 GMT References: <1995May17.201237.4470@netcom.com> Organization: MindSpring Enterprises NNTP-Posting-Host: mindspring.com X-Newsreader: Netscape 1.1N Lines: 9 In article <1995May17.201237.4470@netcom.com>, awatanabe@netcom.com (Anton Watanabe) 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. -- Ji-woo Pérez Tape trading list upon request. SASE required for international mail. From ghughes@hanse.de Sat May 20 17:44:37 1995 Path: ashpoly!bigsur!pacrim!krgate!eunha!hanse!ghughes From: ghughes@hanse.de (Graham Hughes) Newsgroups: comp.dsp Subject: Re: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995May20.174437.8707@hanse.de> Date: Sat, 20 May 1995 17:44:37 GMT References: <1995May17.201237.4470@netcom.com> Organization: Hanse-Netzwerk Hamburg NNTP-Posting-Host: hanse.de X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1995May17.201237.4470@netcom.com>, awatanabe@netcom.com (Anton Watanabe) 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. 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. -- Graham Hughes Tape trading list upon request. SASE required for international mail. From knakamura@purdue.edu Mon May 22 16:24:37 1995 Path: ashpoly!cascade!brgate!saturno!purdue!knakamura From: knakamura@purdue.edu (Katrin Nakamura) Newsgroups: comp.dsp Subject: Re: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995May22.162437.2582@purdue.edu> Date: Mon, 22 May 1995 16:24:37 GMT References: <1995May17.201237.4470@netcom.com> <1995May18.151337.9680@mindspring.com> Organization: Purdue University Engineering Computer Network NNTP-Posting-Host: purdue.edu X-Newsreader: NewsWatcher 2.0b24 Lines: 11 In article <1995May18.151337.9680@mindspring.com>, jperez@mindspring.com (Ji-woo Pérez) writes: > Have you checked your sound card's ADC clock? Cheap Sound Blaster cards use uncalibrated ceramic resonators that drift with temperature. 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. Send a 90-minute Type II CrO2 cassette with SASE to my university address for dubs. -- Katrin Nakamura *PLONK* filter active for trolls. NeXTstation Turbo Color - NetBSD 1.0