Sound spectrum

Introduction

Use USB microphone to listen sound and FFT it to waveforms.

Theory

import pyaudio
#import wave
import multiprocessing
import numpy as np
#import pickle #Not good for np arrays
import time
from pathlib import Path 

audio = pyaudio.PyAudio() # create pyaudio instantiation

info = audio.get_host_api_info_by_index(0)
numdevices = info.get('deviceCount')
for i in range(0, numdevices):
        if (audio.get_device_info_by_host_api_device_index(0, i).get('maxInputChannels')) > 0:
                print( "Input Device id ", i, " - ", audio.get_device_info_by_host_api_device_index(0, i).get('name') )


form_1 = pyaudio.paInt16 # 16-bit resolution
chans = 1 # 1 channel
samp_rate = 44100 # 44.1kHz sampling rate
chunk = 4096 # 2^12 samples for buffer
record_secs = 10 # seconds to record
dev_index = 2 # device index found by p.get_device_info_by_index(ii)
wav_output_filename = 'test1.wav' # name of .wav file