SpeechRecognition Python library

Spoken Language Processing in Python

Daniel Bourke

Machine Learning Engineer/YouTube Creator

Why the SpeechRecognition library?

Some existing python libraries

  • CMU Sphinx
  • Kaldi
  • SpeechRecognition
  • Wav2letter++ by Facebook
Spoken Language Processing in Python

Getting started with SpeechRecognition

Install from PyPi:

$ pip install SpeechRecognition
  • Compatible with Python 2 and 3
  • We'll use Python 3
Spoken Language Processing in Python

Using the Recognizer class

# Import the SpeechRecognition library
import speech_recognition as sr

# Create an instance of Recognizer
recognizer = sr.Recognizer()

# Set the energy threshold
recognizer.energy_threshold = 300
Spoken Language Processing in Python

Using the Recognizer class to recognize speech

  • Recognizer class has built-in functions which interact with speech APIs
    • recognize_bing()
    • recognize_google()
    • recognize_google_cloud()
    • recognize_wit()

Input: audio_file

Output: transcribed speech from audio_file

Spoken Language Processing in Python

SpeechRecognition Example

  • Focus on recognize_google()

  • Recognize speech from an audio file with SpeechRecognition:

# Import SpeechRecognition library
import speech_recognition as sr

# Instantiate Recognizer class
recognizer = sr.Recognizer()

# Transcribe speech using Goole web API
recognizer.recognize_google(audio_data=audio_file
                            language="en-US")

Learning speech recognition on DataCamp is awesome!
Spoken Language Processing in Python

Your turn!

Spoken Language Processing in Python

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