라즈베리파이 파이썬3 FFT연산을 활용한 주파수 분석 소스 수정 도와주세요ㅠㅠ

import wave
import struct
import numpy as np
import wave
import contextlib
import RPi.GPIO as GPIO
import time
 
 
GPIO.setmode(GPIO.BCM)
 
 
GPIO.setup(6, GPIO.OUT)
GPIO.setup(17, GPIO.OUT)
GPIO.setup(27, GPIO.OUT)
GPIO.setup(21, GPIO.IN)
 
 
if __name__ == '__main__':
    fname = "test.wav"
    frate = 0
    data_size = 0
 
    with contextlib.closing(wave.open(fname,'r')) as f:
        frate = f.getframerate()
        data_size = f.getnframes()
 
    wav_file = wave.open(fname, 'r')
    data = wav_file.readframes(data_size)
    data_size = data_size * wav_file.getnchannels()
 
    print wav_file.getparams()
 
    wav_file.close()
    data = struct.unpack('{n}h'.format(n=data_size), data)
    data = np.array(data)
 
    w = np.fft.fft(data)
    freqs = np.fft.fftfreq(len(w))
    print(freqs.min(), freqs.max())
 
    # Find the peak in the coefficients
 
    idx = np.argmax(np.abs(w))
    freq = freqs[idx]
    freq_in_hertz = abs(freq * frate)
 
    print(freq_in_hertz)
 
 
#1 옥타브 대역 주파수 
if 16 <=freq_in_hertz and freq_in_hertz<=17 :
    GPIO.output(6, HIGH)
    time.sleep(1)
 
    if GPIO.input(21) :
        GPIO.output(17, HIGH)
        GPIO.output(27, LOW)
 
    else :
        GPIO.output(17, LOW)
        GPIO.output(27, HIGH)