Resolution and sampling frequency
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I want to test what resolution and sampling frequency do to the audio signal by reducing sampling rate and resolution of audio files.
How do I do this?
The information I have gotten is that I should start by reducing sampling rate, since it requires the least programming.
And the follow tips:
matlab example of downsampling:
x_downsamling = x (1: 3: end)% takes out every third sample of x vector.
Remember to low-pass filters before downsampling. Why?
Also remember to change the playback speed when playing the sound.
Bit resolution reduction:
Let's say you have a signal that goes between -1 and 1 y.The floor (y + 1) function will take out an integer that is either 0 or 1 so that it is now reduced to 1 bit resolution.Then remember to scale so that the signal goes between -1 and 1.
For other bite resolutions:
1./N*floor(N.*y+a)-bThen select a, b, N to fit the desired bit resolution ..Feel free to test the function you create on a synthetic signal that goes between -1 and 1. you want a curve that looks like a step.
3 commentaires
Star Strider
le 29 Avr 2022
Slight clarification: There are several functions called resample. (This is likely the one you need.)
Walter Roberson
le 29 Avr 2022
Let's say you have a signal that goes between -1 and 1 y.The floor (y + 1) function will take out an integer that is either 0 or 1
y = 1
floor(y+1)
2 is neither 0 nor 1. Saying "either 0 or 1" only holds when that "between -1 and 1" is intended to mean "strictly between" and never equal to the bounds. But in signal processing, it is common to get signals that have elements that are exactly -1 or exactly 1
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