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.. _voicekey:
:mod:`psychopy.voicekey` - Real-time sound processing
======================================================
(Available as of version 1.83.00)
Overview
--------
Hardware voice-keys are used to detect and signal acoustic properties in real
time, e.g., the onset of a spoken word in word-naming studies. PsychoPy
provides two virtual voice-keys, one for detecting vocal onsets and one for vocal
offsets.
All PsychoPy voice-keys can take their input from a file or from a microphone.
Event detection is typically quite similar is both cases.
The base class is very general, and is best thought of as providing a toolkit
for developing a wide range of custom voice-keys. It would be possible to develop
a set of voice-keys, each optimized for detecting different initial phonemes.
Band-pass filtered data and zero-crossing counts are computed in real-time
every 2ms.
Voice-Keys
-------------
.. autoclass:: psychopy.voicekey.OnsetVoiceKey
:members:
:exclude-members: trip
:inherited-members:
.. autoclass:: psychopy.voicekey.OffsetVoiceKey
Signal-processing functions
----------------------------
Several utility functions are available for real-time sound analysis.
.. autofunction:: psychopy.voicekey.smooth
.. autofunction:: psychopy.voicekey.bandpass
.. autofunction:: psychopy.voicekey.rms
.. autofunction:: psychopy.voicekey.std
.. autofunction:: psychopy.voicekey.zero_crossings
.. autofunction:: psychopy.voicekey.tone
.. autofunction:: psychopy.voicekey.apodize
Sound file I/O
---------------
Several helper functions are available for converting and saving sound data
from several data formats (numpy arrays, pyo tables) and file formats. All file formats that
`pyo` supports are available, including `wav`, `flac` for lossless compression. `mp3` format is not
supported (but you can convert to .wav using another utility).
.. autofunction:: psychopy.voicekey.samples_from_table
.. autofunction:: psychopy.voicekey.table_from_samples
.. autofunction:: psychopy.voicekey.table_from_file
.. autofunction:: psychopy.voicekey.samples_from_file
.. autofunction:: psychopy.voicekey.samples_to_file
.. autofunction:: psychopy.voicekey.table_to_file
|
