Average Amplitude (in dB) every second of audio file in Librosa

Question

I want to get an average amplitude of the sound file for every second. For example the average amplitude of 0-1 sec,1-2 sec, and so on. I tried reducing the sample rate to 1 but the value drops to 0 in that case.

import numpy as np 
import matplotlib.pyplot as plt 
from glob import glob
import librosa as lr

y, sr = lr.load(file,sr=10)
print(y)
print(len(y))
time = np.arange(0,len(y))/sr
print(len(time))
print(time,y)

print(y)
fig, ax = plt.subplots()
ax.plot(time,y)
ax.set(xlabel='Time(s)',ylabel='sound amplitude')
plt.show()

Note: I'm trying to get the amplitude value in dB. Really new with Librosa, would appreciate any help:)

Are you actually interested in the peak value over the second? — Tim Roberts, Mar 11 '21 at 07:36

score 2 · Accepted Answer · answered Mar 11 '21 at 07:30

2

This will do average amplitude, which is usually going to be 0.

y, sr = lr.load(file)
second = []
for s in range(0,len(y),sr):
    second.append( y[s:s+sr].mean() )

This will do average abs amplitude.

y, sr = lr.load(file)
second = []
for s in range(0,len(y),sr):
    second.append( np.abs(y[s:s+sr]).mean())

answered Mar 11 '21 at 07:30

Tim Roberts

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Thank you Tim for your answer, Let me check them and see if this solves my problem. – Lakshya Kumar Mar 11 '21 at 07:54
You might want to try `np.max` instead, to get the peak value. – Tim Roberts Mar 11 '21 at 18:46

Average Amplitude (in dB) every second of audio file in Librosa

1 Answers1