From dsanchez@panix.com Sun Feb 11 03:01:28 1996 Path: ashpoly!bigsur!pacrim!jpgate!kamome!panix!dsanchez From: dsanchez@panix.com (Diego Sánchez) Newsgroups: comp.dsp Subject: [SPECULATION] Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1996Feb11.030128.2572@panix.com> Date: Sun, 11 Feb 1996 03:01:28 GMT Organization: Public Access Unix of New York NNTP-Posting-Host: panix.com X-Newsreader: WinVN 0.99.5 Lines: 11 Comparing window sidelobe attenuation on 16-bit 44.1 kHz WAV files. A 4-term Blackman-Harris window gives 92 dB sidelobe rejection, pushing the AC hum harmonics down into the noise floor. At 14.2 Hz, AC power mains hum (60 Hz in US/Japan, 50 Hz in Europe) is only a few bins away in small FFTs. What sampling rates are people using for their vinyl rips? 44.1 kHz or 48 kHz DAT? -- Diego Sánchez Hayes Optima 288 @ 14,400 bps "We don't sign stars. We build them." From jlee@stanford.edu Sun Feb 11 07:49:28 1996 Path: ashpoly!cascade!transat!ukc!fennimore!stanford!jlee From: jlee@stanford.edu (Ji-woo Lee) Newsgroups: comp.dsp Subject: Re: [SPECULATION] Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1996Feb11.074928.8293@stanford.edu> Date: Sun, 11 Feb 1996 07:49:28 GMT References: <1996Feb11.030128.2572@panix.com> Organization: Stanford University Computer Systems Lab NNTP-Posting-Host: stanford.edu X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1996Feb11.030128.2572@panix.com>, dsanchez@panix.com (Diego Sánchez) writes: > Comparing window sidelobe attenuation on 16-bit 44.1 kHz WAV files. > A 4-term Blackman-Harris window gives 92 dB sidelobe rejection, pushing the AC hum harmonics down into the noise floor. Excellent advice on the Blackman-Harris window. Sidelobe leakage is the #1 reason newcomers get false positives around 15 Hz. -- Ji-woo Lee Tape trading list upon request. SASE required for international mail.