bugGNU Octave - Bugs: bug #58737, record function has no audio...


bug #58737: record function has no audio initially in the waveform

Submitted by:  Bryce Orgill <tman22>
Submitted on:  Thu 09 Jul 2020 02:45:59 AM UTC  
Category:  Octave Function Severity:  3 - Normal
Priority:  5 - Normal Item Group:  Incorrect Result
Status:  None Assigned to:  None
Originator Name:  Bryce Orgill Open/Closed:  Open
Release:  5.2.0 Operating System:  Microsoft Windows

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Thu 09 Jul 2020 07:54:13 PM UTC, comment #2: 

I can't reproduce this on Debian, so likely not a general Octave bug with the audio functions. This may be a problem with the PortAudio interface with the Windows sound API. If this behavior is reproducible and is of concern to you, you may need to do some more work to investigate the cause and see if anything can be done about it in Octave.

Mike Miller <mtmiller>
Project Administrator
Thu 09 Jul 2020 02:49:37 AM UTC, comment #1: 

To finish my middle comment there: "Another item, and I understand this is a feature request.  Why can we not use a number of samples parameter instead of" ... instead of length.  This would be better since you would have a fixed number of samples which is good for FFT scripts, rather than a length that may not always capture the same amount of samples each time.

Bryce Orgill <tman22>
Thu 09 Jul 2020 02:45:59 AM UTC, original submission:  

I'm noticing when using the record function that I see no audio "wiggling" in the waveform initially.  For the first 50ms or so, it's not present, then I do see the audio.  I simply use the command below, where step=0.1 and Fs=44100.  This function worked fine in Matlab several years ago when I used this function last.  Attached is a screenshot of what I'm seeing.

Another item, and I understand this is a feature request.  Why can we not use a number of samples parameter instead of

y = record(step,Fs);

Bryce Orgill <tman22>


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    Date Changed by Updated Field Previous Value => Replaced by
    2020-07-09 tman22 Attached File- => Added 2020-07-08@19_38_03-Figure@1.png, #49451

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