Real-time Speech Recognition from PC Audio

What will you learn?

By diving into this tutorial, you will master the art of implementing real-time speech recognition using Python on your PC. You will explore capturing audio input from your computer’s microphone, processing the audio data, and transcribing it into text in near real-time.

Introduction to the Problem and Solution

The challenge of achieving real-time speech recognition involves seamlessly converting spoken words into text format using Python libraries such as SpeechRecognition and PyAudio. This process entails capturing audio input from a computer’s microphone, processing it effectively, and accurately transcribing it into readable text in real-time. By leveraging the functionalities offered by these libraries, developers can craft robust systems capable of understanding and transcribing human speech with precision.


# Import necessary libraries
import speech_recognition as sr

# Initialize recognizer class (for recognizing the speech)
r = sr.Recognizer()

# Capture microphone audio
with sr.Microphone() as source:
    audio_text = r.listen(source)

        # Recognize the audio input in real time
        recognized_text = r.recognize_google(audio_text)
        print(f"Recognized Speech: {recognized_text}")

    except Exception as e:
        print("Error : " + str(e))

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# Copyright PHD


In this code snippet: – We import the speech_recognition library with an alias sr. – An instance of the recognizer class r is created for handling speech recognition. – Using a context manager, we capture audio data from the microphone. – The captured audio is processed by Google’s Web Speech API through the recognize_google() method. – Any recognized text is then printed out or appropriate error handling is implemented.

This code provides a foundational implementation of real-time speech recognition using Python.

  1. How do I install the required libraries for this script?

  2. To install necessary libraries, utilize pip commands:

  3. pip install SpeechRecognition pyaudio 
  4. # Copyright PHD
  5. Can I integrate this with other applications?

  6. Absolutely! This functionality can be seamlessly integrated with various applications like virtual assistants or voice-controlled systems.

  7. Is there support for multiple languages in this implementation?

  8. Yes, recognize_google() function supports multiple languages; specify language parameters accordingly.

  9. How accurate is Google’s Web Speech API for transcription?

  10. Google’s Web Speech API offers good accuracy levels but may vary based on factors like accent and background noise.

  11. Can I train my own models for better accuracy?

  12. Certainly! You can train custom models utilizing specific datasets if higher accuracy beyond standard APIs is required.

  13. How resource-intensive is real-time speech recognition on system performance?

  14. Real-time speech recognition may consume CPU resources due to continuous processing of incoming audio data; hence optimization techniques are advisable for efficiency.


Venturing into real-time speech-to-text conversion opens up a realm of possibilities across diverse domains such as accessibility tools, dictation software development, or smart home automation. Through harnessing available Python libraries like SpeechRecognition alongside APIs provided by tech giants like Google Cloud Platform or Amazon AWS, developers are empowered to craft innovative applications that seamlessly interact through voice commands.

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