# python – How do I get the corresponding note if given the frequency as an integer

I am taking input from the microphone, performing an FTT and then getting the frequency value corresponding to the greatest y value (amplitude) of the wav file:

import scipy.io.wavfile as wavfile
import scipy
import scipy.fftpack as fftpk
import numpy as np
import wave
import pyaudio
from matplotlib import pyplot as plt

CHUNK = 1024
FORMAT = pyaudio.paInt16
CHANNELS = 1
RATE = 44100
RECORD_SECONDS = 5
WAVE_OUTPUT_FILENAME = "voice.wav"

p = pyaudio.PyAudio()

stream = p.open(format=FORMAT,
channels=CHANNELS,
rate=RATE,
input=True,
frames_per_buffer=CHUNK)

print("* recording")

frames = []

for i in range(0, int(RATE / CHUNK * RECORD_SECONDS)):
frames.append(data)

print("* done recording")

stream.stop_stream()
stream.close()
p.terminate()

wf = wave.open(WAVE_OUTPUT_FILENAME, 'wb')
wf.setnchannels(CHANNELS)
wf.setsampwidth(p.get_sample_size(FORMAT))
wf.setframerate(RATE)
wf.writeframes(b''.join(frames))
wf.close()

audio = input_data[1]

FFT = abs(fftpk.fft(signal))
freqs = fftpk.fftfreq(len(FFT), (1.0/s_rate))
plt.plot(freqs[range(len(FFT)//2)] ,FFT[range(len(FFT)//2)])
threshold = 5000

def find_x(val, xdata, ydata):
x = np.where(ydata == val)
return int(xdata[x])
ydata = FFT[range(len(FFT)//2)]
xdata = freqs[range(len(FFT)//2)]
print(find_x(max(ydata),xdata,ydata))

plt.xlabel("Frequency")
plt.ylabel("Amplitude")
plt.plot(audio)
plt.show()


After receiving the frequency value, I am struggling to convert the frequency into an actual note and return that as a string. It would be appreciated if the community could help me.