From: Pander via SoX-devel <sox-devel@lists.sourceforge.net>
To: "Måns Rullgård" <mans@mansr.com>, "Eric Wong" <normalperson@yhbt.net>
Cc: Pander <pander@users.sourceforge.net>, sox-devel@lists.sourceforge.net
Subject: Re: [PATCH RESEND 9/9] Added average power spectrum for stat -freq -a
Date: Mon, 3 Aug 2020 14:44:14 +0200 [thread overview]
Message-ID: <aa2e06ea-139a-3377-df40-d7b661ea094b@users.sourceforge.net> (raw)
In-Reply-To: <yw1xo8ntxqt8.fsf@mansr.com>
On 8/2/20 12:52, Måns Rullgård wrote:
> Måns Rullgård <mans@mansr.com> writes:
>
>>> + if (stat->fft_average) {
>>> + for (i = 0; i < samples / 2; i++) /* FIXME: should be <= samples / 2 */
>>> + fprintf(stderr, " %f %f\n", ffa * i, re_average[i] / len);
>>> + }
>> I don't understand the idea here. Unless I'm mistaken, this prints the
>> power spectrum averaged over however many FFT blocks happen to fit in
>> the input chunk, which could be none.
> Oh, and the "average" it calculates is bonkers too.
It provides an average of only full blocks, as partly filled blocks mess
up the average. This is still in development and I plan to continue with
it soon, especially providing a test set demonstrating its value. Can
you please elaborate on what you mean with bonkers here?
>
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next prev parent reply other threads:[~2020-08-13 16:22 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-07-31 9:37 [PATCH RESEND 0/9] some old accumulated patches Eric Wong
2020-07-31 9:37 ` [PATCH RESEND 1/9] use non-blocking stdin for interactive mode Eric Wong
2020-07-31 9:37 ` [PATCH RESEND 2/9] speed up "|program" inputs on Linux 2.6.35+ Eric Wong
2020-07-31 10:53 ` Måns Rullgård
2020-07-31 9:37 ` [PATCH RESEND 3/9] sox.1: fix section name Eric Wong
2020-07-31 9:37 ` [PATCH RESEND 4/9] sndio: handle 24-bit samples properly on OpenBSD Eric Wong
2020-07-31 10:59 ` Måns Rullgård
2020-07-31 9:37 ` [PATCH RESEND 5/9] Handle vorbis_analysis_headerout errors Eric Wong
2020-07-31 9:37 ` [PATCH RESEND 6/9] fix manpage warning: "table wider than line width" Eric Wong
2020-07-31 9:37 ` [PATCH RESEND 7/9] spectrogram: remove arbitrary limit on height of spectrogram Eric Wong
2020-07-31 14:34 ` Måns Rullgård
[not found] ` <CAL4-wQpF-qOD=BRVPhgZFC7fjvFDV-rQx1stvwY_xCTyj5uooA@mail.gmail.com>
2020-08-13 16:20 ` Måns Rullgård
2020-08-13 16:30 ` Pander via SoX-devel
2020-08-13 16:38 ` Måns Rullgård
2020-07-31 9:38 ` [PATCH RESEND 8/9] Add spectrogram -n flag to normalise the output to maximum brightness Eric Wong
2020-07-31 9:38 ` [PATCH RESEND 9/9] Added average power spectrum for stat -freq -a Eric Wong
2020-08-01 11:52 ` Måns Rullgård
2020-08-02 1:03 ` Eric Wong
2020-08-02 10:43 ` Måns Rullgård
2020-08-02 10:52 ` Måns Rullgård
2020-08-03 12:44 ` Pander via SoX-devel [this message]
2020-08-03 13:41 ` Måns Rullgård
2020-07-31 10:13 ` [PATCH RESEND 0/9] some old accumulated patches Måns Rullgård
2020-07-31 21:16 ` Eric Wong
2020-07-31 21:44 ` Måns Rullgård
2020-08-01 16:57 ` Måns Rullgård
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