sound_monitor.py

import pyaudio
import math
import struct
import playsound

CHUNK = 2048
THRESHOLD = 70
REFERENCE_LEVEL = 0.00005

def rms( data ):
  count = len(data)/2
  format = "%dh"%(count)
  shorts = struct.unpack( format, data )
  sum_squares = 0.0
  for sample in shorts:
    n = sample * (1.0/32768)
    sum_squares += n*n
  return math.sqrt( sum_squares / count )

def decibels(rms):
  return 20 * math.log10(rms/REFERENCE_LEVEL)

p = pyaudio.PyAudio()
stream = p.open(format = pyaudio.paInt16,
  channels = 1,
  rate = 44100,
  input = True,
  frames_per_buffer = CHUNK)

while True:
  data = stream.read(CHUNK)
  dB = int(decibels(rms(data)))
  print(f"\r {dB} dB [{'*'*(dB)}{' '*(100-dB)}]",end="")
  if (dB >= THRESHOLD):
    playsound.playsound('alert-1.mp3')