How to create a voice recorder in Python

Python can be used to perform a variety of tasks. One of them is creating a voice recorder. We can use python’s sounddevice module to record and play audio. This module along with the wavio or the scipy module provides the way to save recorded audio.

Installation

• sounddevice: This module provides functions to play and record NumPy arrays containing audio signals. Let’s install it by running the following command:

$ pip3 install sounddevice

• We can use either wavio and scipy to save the recorded audio in file format. We will see both of them here.
• To install wavio:

$ pip3 install wavio 

• To install scipy:

$ pip3 install scipy

Now, we are done with installing the required modules. So, let’s write the code.

Getting Started

First, import the required libraries.

 import required libraries 
import sounddevice as sd 
from scipy.io.wavfile import write 
import wavio as wv 

Now, before starting the recorder, we have to declare a few variables. The first one is the sampling frequency of the audio (in most cases this will be 44100 or 48000 frames per second) and the second is recording duration. We have to specify the duration in seconds so that it stops recording after that duration.

So, let’s declare them too.

# Sampling frequency 
freq = 44100 
 
# Recording duration 
duration = 5 

Now, we are ready to start the recorder. It will create a NumPy array of the recorded audio.

# Start recorder with the given values of  
# duration and sample frequency 
recording = sd.rec(int(duration * freq),  
                   samplerate=freq, channels=2) 
 
# Record audio for the given number of seconds 
sd.wait()

Now, we are done with recording the audio. So, let’s save it. To save the audio file, we can either use the scipy module or the wavio module. Let’s go through them one by one.

Using Scipy:

We will use the write function from http://scipy.io.wavfile to convert the NumPy array to an audio file.

# This will convert the NumPy array to an audio
# file with the given sampling frequency
write("recording0.wav", freq, recording)

Using wavio:

We can also use the write function from the wavio library.

# Convert the NumPy array to audio file
wv.write("recording1.wav", recording, freq, sampwidth=2)

Complete Code:

# import required libraries
import sounddevice as sd
from scipy.io.wavfile import write
import wavio as wv
# Sampling frequency 
freq = 44100
# Recording duration 
duration = 5
# Start recorder with the given values  
# of duration and sample frequency 
recording = sd.rec(int(duration * freq),  
 samplerate=freq, channels=2) 
# Record audio for the given number of seconds 
sd.wait() 
# This will convert the NumPy array to an audio 
# file with the given sampling frequency 
write("recording0.wav", freq, recording) 
# Convert the NumPy array to audio file 
wv.write("recording1.wav", recording, freq, sampwidth=2)

Conclusion

In this way, we can create a voice recorder using python. If you find any difficulty in following the tutorial, mention them in the comment section.

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