[Octave-bug-tracker] [bug #59149] Resampling from 22050 to 48000 Hz introduces a strange and unexpected artifacts

[anonymous]

URL:
  <https://savannah.gnu.org/bugs/?59149>

                 Summary: Resampling from 22050 to 48000 Hz introduces a
strange and unexpected artifacts
                 Project: GNU Octave
            Submitted by: None
            Submitted on: Sun 20 Sep 2020 06:37:54 AM UTC
                Category: Octave Function
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: Incorrect Result
                  Status: None
             Assigned to: None
         Originator Name: Marc René Schädler
        Originator Email: suaefar@googlemail.com
             Open/Closed: Open
                 Release: 5.2.0
         Discussion Lock: Any
        Operating System: GNU/Linux

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Details:


%I noticed this when preparing listening experiments for listeners with
impaired hearing, where these high-frequency components (see result of code
example below) get amplified and are producing audible distortions.
% The sox resampler does not produce such artifacts

% Code that produces the artifact for me:

% Generate a sine wave
fs = 22050;
s = sin(linspace(0,1000.*2*pi,fs+1));

% Resample from 22050 to 48000 Hz
sr = resample(s,48000,fs);

% Plot first 100ms of both signals
plot((1:2205)./2205,s(1:2205)); hold on;
plot((1:4800)./4800,sr(1:4800));

% Watch closely and you should see that one sample is "off" a bit
xlim([0.37 0.39])







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