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java - Downsample PCM audio 44100 to 8000 - Stack Overflow
https://stackoverflow.com/questions/19606526/downsample-pcm-audio-44100-to-8000#:~:text=The%20algorithm%20processes%20exactly%20882%20input%20samples%20and,160%20short%20values%20to%20the%20already%20processed%20samples.
Is there any deterministic downsampling algorithm for audio?
https://dsp.stackexchange.com/questions/75703/is-there-any-deterministic-downsampling-algorithm-for-audio
I was trying to use the scipy.decimate function provided in the library, but I had a question - I want a pre-processing algorithm to downsample audio in such a way that it is fully deterministic i.e, It would always output the same decimated signal, provided an original signal.. So, the algorithm should be able to downsample it in a similar way on all audio pieces - and …
java - Audio files down-sample - Stack Overflow
https://stackoverflow.com/questions/7133679/audio-files-down-sample
As for the frequency downsampling, if you were to play a 44100 Hz audio file as if it were a 5000hz audio file, you'll have too much data, which will make it sound slowed down. So take samples in increments of int (44100/5000) to downsample it …
Downsampling audio for use in Machine Learning - Signal ...
https://dsp.stackexchange.com/questions/47152/downsampling-audio-for-use-in-machine-learning
Downsampling audio for use in Machine Learning. Ask Question Asked 3 years, 11 months ago. ... provided that you adjust certain points in the algorithm that are specifically hardwired for a sampling frequency that is different than the one you are using. ... If you downsample without filtering you are very likely to produce distorted signals.
Downsampling and applying a lowpass filter to digital audio
https://stackoverflow.com/questions/238382/downsampling-and-applying-a-lowpass-filter-to-digital-audio
This turns out to be proportional to the "sinc" function (sin at)/at, where a is the width of the box in the frequency space. So at every 4th location (since you're downsampling by a factor of 4) you can add up the points near it, multiplied by sin (a dt) / …
Downsampling Audio Sample - CodeGuru
https://forums.codeguru.com/showthread.php?463186-Downsampling-Audio-Sample
The formula to do it is. Z [p] = (1/m) * (a [0] * Q [6p] + a [1] * Q [6p+1]) + a [2] * Q [6p + 2] +. a [3] * Q [6p + 3] +. a [4] * Q [6p + 4] + a [5] * Q [6p + 5]) Z = Targetarray. a = windowing coefficient. m = sum of windowing coefficient. Q = Sourcesample [Raw Audio Data] …
Upsampling and Downsampling - CCRMA
https://ccrma.stanford.edu/~jos/JFB/JFB_2up.pdf
DownsampleN(x) ↔ 1 N AliasN(X) or x(nN) ↔1 N NX−1 m=0 X ej2πm/Nz1/N From the DFT case, we know this is true when xand X are each complex sequences of length Ns, in which case y and Y are length Ns/N. Thus, x(nN) ↔Y(ωkN) = 1 N NX−1 m=0 X ωk+ 2π N m ,k∈ 0, Ns N where we have chosen to keep frequency samples ωk in
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