This script demonstrates how to record audio from a microphone using the PyAudio library in Python and save it as a WAV file. Here is a step-by-step description of what the code does:

• pyaudio: This library provides Python bindings for PortAudio, a cross-platform audio I/O library.
• wave: This library is used to read and write WAV files.

p = pyaudio.PyAudio()

• FORMAT: Specifies the audio format (16-bit PCM in this case).
• FS: The sampling frequency (44100 Hz, which is CD quality).
• CHANNELS: The number of audio channels (1 for mono).
• CHUNK: The size of each audio chunk (1024 frames).
• RECORD_SECOND: Duration of the recording in seconds (3 seconds).

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

• A list frames is initialized to store the recorded audio data.
• num_times calculates the number of chunks to be recorded based on the duration and chunk size.
• A loop reads the audio data from the stream in chunks and appends it to the frames list.

stream.start_stream()
stream.close()
p.terminate()

• The frames list, which contains the recorded audio data, is printed.

• samplewidth retrieves the sample size of the audio format.
• A new WAV file output.wav is created.
• The number of channels, sample width, and frame rate are set.
• The recorded frames are written to the WAV file.
• The WAV file is closed.

This snippet includes all necessary details about the parameters and the steps taken in the code.