Numpy Array - Audio file - python-3.x

Question

I am trying to analyze some audio file. I am using several helper function that helps me to do some data transformations task.
from typing import List, Tuple
import webrtcvad
import numpy.typing as npt
import numpy as np
import os
from scipy.io.wavfile import read, write
vad = webrtcvad.Vad()
vad.set_mode(2)
def _validate_array_dtype(array: npt.NDArray):
if not isinstance(array, np.ndarray):
raise ValueError(f"Chunk has to be type np.ndarray but is {type(array)}")
if array.dtype != np.int16:
raise ValueError(
f"Chunk array has to be dtype np.int16 but is {array.dtype}")
def is_speech(frame: npt.NDArray, sample_rate: int) -> bool:
"""Detect if this audio segment is speech or not.
Args:
frame: Numpy array (dtype int16) of audio waveform. Duration needs to be exactly 10, 20 or 30 ms.
sample_rate: Sample rate of the audio frame in Hz.
Returns:
Whether this frame contained speech.
"""
if len(frame.shape) != 1:
raise ValueError("Frame must be a 1D numpy array.")
_validate_array_dtype(frame)
samples_per_ms = (sample_rate) // 1000 # samples for 10 ms
allowed_lengths = {
10 * samples_per_ms, 20 * samples_per_ms, 30 * samples_per_ms
}
if frame.shape[0] not in allowed_lengths:
raise ValueError("Frame must have duration of either 10, 20 or 30 ms.")
raw_frame = frame.tobytes()
return vad.is_speech(raw_frame, sample_rate)
def read_wav(wav_path: str) -> Tuple[int, npt.NDArray]:
"""Read data from a .wav audio file into a numpy array.
Args:
wav_path: Path to the wav file to load.
Returns:
A tuple containing, the sample rate of the audio file loaded and raw audio data as numpy array (dtype int16).
"""
return read(wav_path)
I am struggling to understand how is_speech function is working.
Once I call
is_speech(np.array([1,1,1,1,1,1,1,1,1,1], dtype=np.int16), sample_rate=10)
It returns me the following error: Value error: Frame must have duration of either 10, 20 or 30 ms.
I pass to is_speech 10 elements it returns this error. I can see from definition of function this value error raise(catch), but fail to get how to use this function properly. Would you like to help me how to use this function? Many thanks in advance.