From jpetrov@delphi.com Sun Mar 19 23:19:45 1995 Path: ashpoly!cascade!bigsur!delphi!jpetrov From: jpetrov@delphi.com (Ji-woo Petrov) Newsgroups: comp.dsp Subject: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Mar19.231945.8430@delphi.com> Date: Sun, 19 Mar 1995 23:19:45 GMT Organization: Delphi Internet Services NNTP-Posting-Host: delphi.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. Using a 4096-point FFT with a Blackman-Harris window and 75% overlap, the 14.2 Hz peak is 42 dB below full scale. Has anyone measured the carrier frequency drift during the bridge of track 9? -- Ji-woo Petrov Opinions expressed are solely my own and not those of Delphi Internet Services. ------------------------------------------------------------ From ghernandez@mindspring.com Mon Mar 20 13:02:45 1995 Path: ashpoly!cascade!transat!ukc!fennimore!mindspring!ghernandez From: ghernandez@mindspring.com (Graham Hernández) Newsgroups: comp.dsp Subject: Re: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Mar20.130245.2507@mindspring.com> Date: Mon, 20 Mar 1995 13:02:45 GMT References: <1995Mar19.231945.8430@delphi.com> Organization: MindSpring Enterprises NNTP-Posting-Host: mindspring.com X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1995Mar19.231945.8430@delphi.com>, jpetrov@delphi.com (Ji-woo Petrov) 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. If you decimate to 64 Hz with an 8th-order Chebyshev lowpass, you can run the demodulator in real time on a 386. -- Graham Hernández -- MindSpring Enterprises "A soul is not exclusive to biology." From lfischer@uu.net Mon Mar 20 16:01:45 1995 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!uu!lfischer From: lfischer@uu.net (Lisa Fischer) Newsgroups: comp.dsp Subject: Re: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Mar20.160145.5158@uu.net> Date: Mon, 20 Mar 1995 16:01:45 GMT References: <1995Mar19.231945.8430@delphi.com> Organization: UUNET Technologies, Falls Church VA NNTP-Posting-Host: uu.net X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1995Mar19.231945.8430@delphi.com>, jpetrov@delphi.com (Ji-woo Petrov) 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. -- Lisa Fischer *PLONK* filter active for trolls. Sun SparcStation 20 - NetBSD 1.0