USB Microphone for Raspberry Pi (Color may Vary)

USB Microphone for Raspberry Pi (Color may Vary)

Overview

The USB Microphone for Raspberry Pi is a plug-and-play audio input device designed specifically for use with Raspberry Pi boards. This compact microphone connects directly to the Raspberry Pi's USB port, providing a convenient and easy-to-use solution for a wide range of audio applications.

Technical Specifications

Interface: USB 2.0
 Sampling Rate: 44.1 kHz, 48 kHz, 96 kHz
 Bit Depth: 16-bit
 Frequency Response: 20 Hz - 20 kHz
 Sensitivity: -40 dB  3 dB
 Connector: USB-A

Hardware Requirements

Raspberry Pi (any model)
 USB port

Software Requirements

Raspbian (recommended)
 Python 3.x (for code examples)

Code Examples

### Example 1: Basic Audio Recording using Python

This example demonstrates how to use the USB Microphone to record audio using Python and the `pyaudio` library.

Hardware

Raspberry Pi (any model)
 USB Microphone for Raspberry Pi
 USB port

Software

Raspbian (recommended)
 Python 3.x
 `pyaudio` library (install using `pip install pyaudio`)

Code
```python
import pyaudio
import wave

# Initialize PyAudio
p = pyaudio.PyAudio()

# Open the microphone stream
stream = p.open(format=pyaudio.paInt16,
                channels=1,
                rate=44100,
                input=True,
                frames_per_buffer=1024)

print("Recording...")

# Record audio for 5 seconds
frames = []
for i in range(0, int(44100 / 1024  5)):
    data = stream.read(1024)
    frames.append(data)

# Close the stream
stream.stop_stream()
stream.close()
p.terminate()

# Save the recorded audio to a WAV file
wf = wave.open("recorded_audio.wav", "wb")
wf.setnchannels(1)
wf.setsampwidth(2)
wf.setframerate(44100)
wf.writeframes(b"".join(frames))
wf.close()

print("Recording saved to recorded_audio.wav")
```
### Example 2: Real-time Audio Processing using OpenCV and Python

This example demonstrates how to use the USB Microphone to capture audio in real-time and process it using OpenCV and Python.

Hardware

Raspberry Pi (any model)
 USB Microphone for Raspberry Pi
 USB port
 Webcam (optional)

Software

Raspbian (recommended)
 Python 3.x
 OpenCV (install using `pip install opencv-python`)
 `pyaudio` library (install using `pip install pyaudio`)

Code
```python
import cv2
import pyaudio
import numpy as np

# Initialize OpenCV
cv2.namedWindow("Audio Waveform")

# Initialize PyAudio
p = pyaudio.PyAudio()

# Open the microphone stream
stream = p.open(format=pyaudio.paInt16,
                channels=1,
                rate=44100,
                input=True,
                frames_per_buffer=1024)

while True:
    # Read audio data from the microphone
    data = stream.read(1024)

# Convert audio data to a NumPy array
    audio_array = np.frombuffer(data, dtype=np.int16)

# Create a waveform image using OpenCV
    img = np.zeros((200, 400, 3), dtype=np.uint8)
    for i in range(len(audio_array)):
        x = int(i  400 / len(audio_array))
        y = int(100 + audio_array[i] / 32768  100)
        cv2.line(img, (x, 100), (x, y), (0, 255, 0), 1)

# Display the waveform image
    cv2.imshow("Audio Waveform", img)

# Exit on key press
    if cv2.waitKey(1) & 0xFF == ord('q'):
        break

# Close the stream and PyAudio
stream.stop_stream()
stream.close()
p.terminate()
cv2.destroyAllWindows()
```
Note: This example assumes a webcam is connected and available. If no webcam is present, the code will still run, but the waveform will not be displayed.