what should be the constraint on window length in function melspectrogram?

27 vues (au cours des 30 derniers jours)
hi there
I am using the in built function melspectrogram in a loop, for calculation of spectrograms of a wav dataset.
The code I am using is given below:
fs = 44100;
frameDuration = 0.046;
hopDuration = 0.023;
numBands = 128;
frameLength = round(frameDuration*fs);
hopLength = round(hopDuration*fs);
spec = melSpectrogram(x,fs, ...
'WindowLength',frameLength, ...
'OverlapLength',frameLength - hopLength, ...
'FFTLength',2048, ...
'NumBands',numBands, ...
'FrequencyRange',[50,8000]);
getting the error below:
Error using audio.internal.MelSpectrogramValidator/validateOptionalInputs (line 97)
Invalid window length. WINDOWLENGTH must be in the range [2,size(x,1)], where x is the audio input.
The default window length depends on the specified sample rate: round(fs*0.03).
the audio data length is 160000. Can someone guide me whats wrong here? This is working fine on other dataset, with sampling rate=16000.
Thanks

Réponse acceptée

jibrahim
jibrahim le 12 Jan 2022
Hi Krishna,
This looks fine. Make sure that your input x is a column vector, not a row vector. The function treats each column as a separate channel, so I would expect to see this error if x is a long row vector,
  3 commentaires
jibrahim
jibrahim le 13 Jan 2022
OK... Could you update your reproduction steps to include x? You can either instantiate a vector of the same dimensions, or attach x in a MAT file.
krishna Chauhan
krishna Chauhan le 15 Jan 2022
Yes sir you are right. In first case read(ads) thowring x as 60000X1 double, while in scond the size is 1X6000 double I just checked.Now I can make x as x', but my proble is why read(ads) is reading wav files in different way.
Thanks

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