如何将 numpy 数组中的 32 位 wav 文件转换为 24 位 wav 文件？

Question

I would like to convert a 32-bit wav numpy array to a 24-bit wav numpy array using python3 and the numpy library.

I am reading the file like this:

import numpy as np
    sample_rate, file_info = read(filepath)
    np_array = np.array(file_info)

Now based on the dtype which can be extracted via something like this

if (str(np_array.dtype) == 'int32'):

I would like to retranscode the np_array to become a 24bit array. I need to do this for analysis purposes. The goal is - not to generate a new file.

Any hints in how to do this effectively?

Thank you

Answer 1

import sox

 

transformer = sox.Transformer()
transformer.convert(samplerate=sample_rate, bitdepth=16)
sox_array = transformer.build_array(sample_rate_in=sample_rate, input_array=np_array)

This will convert the array to 16bit, which allows for analysis workflows, which will always be the same.