pocketsphinx 0.1.3

Python interface to CMU Sphinxbase and Pocketsphinx libraries

Pocketsphinx is a part of the CMU Sphinx Open Source Toolkit For Speech Recognition.

This package provides a python interface to CMU Sphinxbase and Pocketsphinx libraries created with SWIG and Setuptools.

Supported platforms

• Windows
• Linux
• Mac OS X

Installation

# Make sure we have up-to-date versions of pip, setuptools and wheel:
$ pip install --upgrade pip setuptools wheel

$ pip install --upgrade pocketsphinx

More binary distributions for manual installation are available here.

Usage

LiveSpeech

It’s an iterator class for continuous recognition or keyword search from a microphone.

from pocketsphinx import LiveSpeech
for phrase in LiveSpeech(): print(phrase)

An example of a keyword search:

from pocketsphinx import LiveSpeech

speech = LiveSpeech(lm=False, keyphrase='forward', kws_threshold=1e+20)
for phrase in speech:
    print(phrase.segments(detailed=True))

With your model and dictionary:

import os
from pocketsphinx import LiveSpeech, get_model_path

model_path = get_model_path()

speech = LiveSpeech(
    verbose=False,
    sampling_rate=16000,
    buffer_size=2048,
    no_search=False,
    full_utt=False,
    hmm=os.path.join(model_path, 'en-us'),
    lm=os.path.join(model_path, 'en-us.lm.bin'),
    dic=os.path.join(model_path, 'cmudict-en-us.dict')
)

for phrase in speech:
    print(phrase)

AudioFile

It’s an iterator class for continuous recognition or keyword search from a file.

from pocketsphinx import AudioFile
for phrase in AudioFile(): print(phrase) # => "go forward ten meters"

An example of a keyword search:

from pocketsphinx import AudioFile

audio = AudioFile(lm=False, keyphrase='forward', kws_threshold=1e+20)
for phrase in audio:
    print(phrase.segments(detailed=True)) # => "[('forward', -617, 63, 121)]"

With your model and dictionary:

import os
from pocketsphinx import AudioFile, get_model_path, get_data_path

model_path = get_model_path()
data_path = get_data_path()

config = {
    'verbose': False,
    'audio_file': os.path.join(data_path, 'goforward.raw'),
    'buffer_size': 2048,
    'no_search': False,
    'full_utt': False,
    'hmm': os.path.join(model_path, 'en-us'),
    'lm': os.path.join(model_path, 'en-us.lm.bin'),
    'dict': os.path.join(model_path, 'cmudict-en-us.dict')
}

audio = AudioFile(**config)
for phrase in audio:
    print(phrase)

Pocketsphinx

It’s a simple and flexible proxy class to pocketsphinx.Decode.

from pocketsphinx import Pocketsphinx
print(Pocketsphinx().decode()) # => "go forward ten meters"

A more comprehensive example:

from __future__ import print_function
import os
from pocketsphinx import Pocketsphinx, get_model_path, get_data_path

model_path = get_model_path()
data_path = get_data_path()

config = {
    'hmm': os.path.join(model_path, 'en-us'),
    'lm': os.path.join(model_path, 'en-us.lm.bin'),
    'dict': os.path.join(model_path, 'cmudict-en-us.dict')
}

ps = Pocketsphinx(**config)
ps.decode(
    audio_file=os.path.join(data_path, 'goforward.raw'),
    buffer_size=2048,
    no_search=False,
    full_utt=False
)

print(ps.segments()) # => ['<s>', '<sil>', 'go', 'forward', 'ten', 'meters', '</s>']
print('Detailed segments:', *ps.segments(detailed=True), sep='\n') # => [
#     word, prob, start_frame, end_frame
#     ('<s>', 0, 0, 24)
#     ('<sil>', -3778, 25, 45)
#     ('go', -27, 46, 63)
#     ('forward', -38, 64, 116)
#     ('ten', -14105, 117, 152)
#     ('meters', -2152, 153, 211)
#     ('</s>', 0, 212, 260)
# ]

print(ps.hypothesis())  # => go forward ten meters
print(ps.probability()) # => -32079
print(ps.score())       # => -7066
print(ps.confidence())  # => 0.04042641466841839

print(*ps.best(count=10), sep='\n') # => [
#     ('go forward ten meters', -28034)
#     ('go for word ten meters', -28570)
#     ('go forward and majors', -28670)
#     ('go forward and meters', -28681)
#     ('go forward and readers', -28685)
#     ('go forward ten readers', -28688)
#     ('go forward ten leaders', -28695)
#     ('go forward can meters', -28695)
#     ('go forward and leaders', -28706)
#     ('go for work ten meters', -28722)
# ]

Default config

If you don’t pass any argument while creating an instance of the Pocketsphinx, AudioFile or LiveSpeech class, it will use next default values:

verbose = False
logfn = /dev/null or nul
audio_file = site-packages/pocketsphinx/data/goforward.raw
audio_device = None
sampling_rate = 16000
buffer_size = 2048
no_search = False
full_utt = False
hmm = site-packages/pocketsphinx/model/en-us
lm = site-packages/pocketsphinx/model/en-us.lm.bin
dict = site-packages/pocketsphinx/model/cmudict-en-us.dict

Any other option must be passed into the config as is, without using symbol -.

If you want to disable default language model or dictionary, you can change the value of the corresponding options to False:

lm = False
dict = False

Verbose

Send output to stdout:

from pocketsphinx import Pocketsphinx

ps = Pocketsphinx(verbose=True)
ps.decode()

print(ps.hypothesis())

Send output to file:

from pocketsphinx import Pocketsphinx

ps = Pocketsphinx(verbose=True, logfn='pocketsphinx.log')
ps.decode()

print(ps.hypothesis())

Сompatibility

Parent classes are still available:

import os
from pocketsphinx import DefaultConfig, Decoder, get_model_path, get_data_path

model_path = get_model_path()
data_path = get_data_path()

# Create a decoder with a certain model
config = DefaultConfig()
config.set_string('-hmm', os.path.join(model_path, 'en-us'))
config.set_string('-lm', os.path.join(model_path, 'en-us.lm.bin'))
config.set_string('-dict', os.path.join(model_path, 'cmudict-en-us.dict'))
decoder = Decoder(config)

# Decode streaming data
buf = bytearray(1024)
with open(os.path.join(data_path, 'goforward.raw'), 'rb') as f:
    decoder.start_utt()
    while f.readinto(buf):
        decoder.process_raw(buf, False, False)
    decoder.end_utt()
print('Best hypothesis segments:', [seg.word for seg in decoder.seg()])

Install development version

Install requirements

Windows requirements:

• Python
• Git
• Swig
• Visual Studio Community

Ubuntu requirements:

$ sudo apt-get install -qq python python-dev python-pip build-essential swig git libpulse-dev

Install with pip

$ pip install https://github.com/bambocher/pocketsphinx-python/archive/master.zip

Install with distutils

$ git clone --recursive https://github.com/bambocher/pocketsphinx-python
$ cd pocketsphinx-python
$ python setup.py install

Projects using pocketsphinx-python

• SpeechRecognition - Library for performing speech recognition, with support for several engines and APIs, online and offline.

License

The BSD License