Fons, regarding,
" It means limited Q, but no discrete central frequencies. " - please implement in the given 8 points example a filter an equalizer, changing 1.5 * Fs / 8, but not affecting other frequencies. To be more versatile: Case_1: input signal is sin(2 * PI * 1 * Fs / 8) + sin(2 * PI * 2 * Fs / 8) Case_2: sin(2 * PI * 1 * Fs / 8) + sin(2 * PI * 1.5 * Fs / 8) + sin(2 * PI * 2 * Fs / 8) . I claim that if I select central frequencies as 1 * Fs / 8 2 * Fs / 8 , them for changing gain of (1 * Fs / 8) will only change amplitude of sin(2 * PI * 1 * Fs / 8), but not of sin(2 * PI * 2 * Fs / 8); changing gain of o(2 * Fs / 8) will change amplitude of sin(2 * PI * 2 * Fs / 8), but not of sin(2 * PI * 1 * Fs / 8); in both cases of gain change in case of Case_2 amplitude of sin(2 * PI * 1.5 * Fs / 8) will change. Whatever implementation of yours should be limited to simple FFT-based equalizer similar to the one I published. That is, data from no more than two adjacent FFT buffers can be used. Thanks in advance, Sergei. On Tue, 3 Jan 2006 02:27:46 +0100 fons adriaensen <[EMAIL PROTECTED]> wrote: > On Tue, Jan 03, 2006 at 03:12:50AM +0200, Sergei Steshenko wrote: > > > In the case of DFT limited N means both limited Q and discrete > > central frequencies in the terms of precise signal restoration. > > It means limited Q, but no discrete central frequencies. > BTW, I've used such 'interpolated frequency' filters many times > in my professional work, and they are also in JAAA. > > Bye for now ! > > -- > FA > > > > > > ------------------------------------------------------- > This SF.net email is sponsored by: Splunk Inc. Do you grep through log files > for problems? Stop! Download the new AJAX search engine that makes > searching your log files as easy as surfing the web. DOWNLOAD SPLUNK! > http://ads.osdn.com/?ad_id=7637&alloc_id=16865&op=click > _______________________________________________ > Alsa-user mailing list > Alsa-user@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/alsa-user > ------------------------------------------------------- This SF.net email is sponsored by: Splunk Inc. Do you grep through log files for problems? Stop! Download the new AJAX search engine that makes searching your log files as easy as surfing the web. DOWNLOAD SPLUNK! http://ads.osdn.com/?ad_id=7637&alloc_id=16865&op=click _______________________________________________ Alsa-user mailing list Alsa-user@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/alsa-user
