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Porcupine Wake Word — Unity API


API Reference for the Porcupine Unity SDK .


package: Pv.Unity


Porcupine

public class Porcupine : IDisposable

Class for the Porcupine Wake Word engine.


Porcupine.BuiltInKeyword

public enum BuiltInKeyword
{
ALEXA,
AMERICANO,
BLUEBERRY,
BUMBLEBEE,
COMPUTER,
GRAPEFRUIT,
GRASSHOPPER,
HEY_GOOGLE,
HEY_SIRI,
JARVIS,
OK_GOOGLE,
PICOVOICE,
PORCUPINE,
TERMINATOR
}

Keywords that are packaged with the Porcupine Unity SDK.


Porcupine.FrameLength

public int FrameLength { get; }

Gets the required number of audio samples-per-frame.

Returns

  • int : Required frame length.

Porcupine.SampleRate

public int SampleRate { get; }

Get the audio sample rate required by Porcupine.

Returns

  • int : Required sample rate in Hz.

Porcupine.Version

public string Version { get; }

Gets the version number of the Porcupine library.

Returns

  • string : Version of Porcupine.

Porcupine.Dispose()

public void Dispose()

Explicitly releases resources acquired by Porcupine.


Porcupine.FromBuiltInKeywords()

public static Porcupine FromBuiltInKeywords(
string accessKey,
IEnumerable<BuiltInKeyword> keywords,
string modelPath = null,
IEnumerable<float> sensitivities = null)

Creates an instance of Porcupine from built-in keywords.

Parameters

  • accessKey string : AccessKey obtained from Picovoice Console .
  • keywords IEnumerable<BuiltInKeyword> : List of built-in keywords to detect.
  • modelPath string : Absolute path to the file containing model parameters (.pv). If not set, default model is used.
  • sensitivities IEnumerable<float> : Sensitivities for detecting keywords. Each value should be a number within [0, 1]. A higher sensitivity results in fewer misses at the cost of increasing the false alarm rate. Default values are 0.5.

Returns

  • Porcupine : An instance of the Porcupine Wake Word engine.

Throws

  • PorcupineException

Porcupine.FromKeywordPaths()

public static Porcupine FromKeywordPaths(
string accessKey,
IEnumerable<string> keywordPaths,
string modelPath = null,
IEnumerable<float> sensitivities = null)

Creates an instance of Porcupine from custom keyword files.

Parameters

  • accessKey string : AccessKey obtained from Picovoice Console .
  • keywordPaths IEnumerable<string> : A list of absolute paths to keyword model files (.ppn).
  • modelPath string : Absolute path to the file containing model parameters (.pv). If not set, default model is used.
  • sensitivities IEnumerable<float> : Sensitivities for detecting keywords. Each value should be a number within [0, 1]. A higher sensitivity results in fewer misses at the cost of increasing the false alarm rate. Default values are 0.5.

Returns

  • Porcupine : An instance of the Porcupine Wake Word engine.

Throws

  • PorcupineException

Porcupine.Process()

public int Process(short[] pcm)

Processes a frame of the incoming audio stream and emits the detection result. The number of samples-per-frame can be obtained by calling .FrameLength. The incoming audio needs to have a sample rate equal to .SampleRate and be 16-bit linearly-encoded. Porcupine operates on single-channel audio.

Parameters

  • pcm short[] : A frame of audio samples.

Returns

  • int : Index of observed keyword at the end of the current frame. Indexing is 0-based and matches the ordering of keywords provided to the Porcupine instance. If no keyword is detected then it returns -1.

Throws

  • PorcupineException

PorcupineException

public class PorcupineException : Exception

Exception thrown if an error is encountered by the Porcupine engine.

Exceptions:

public class PorcupineActivationException : PorcupineException { }
public class PorcupineActivationLimitException : PorcupineException { }
public class PorcupineActivationRefusedException : PorcupineException { }
public class PorcupineActivationThrottledException : PorcupineException { }
public class PorcupineIOException : PorcupineException { }
public class PorcupineInvalidArgumentException : PorcupineException { }
public class PorcupineInvalidStateException : PorcupineException { }
public class PorcupineKeyException : PorcupineException { }
public class PorcupineMemoryException : PorcupineException { }
public class PorcupineRuntimeException : PorcupineException { }
public class PorcupineStopIterationException : PorcupineException { }

PorcupineManager

public class PorcupineManager

High-level API for the Porcupine Wake Word engine. It handles audio recording and processing in real-time, and notifies the client upon detection of the wake word.


PorcupineManager.IsAudioDeviceAvailable

public bool IsAudioDeviceAvailable { get; }

Checks whether there are any audio capture devices available.

Returns

  • bool : If any available audio capture device are available.

PorcupineManager.IsRecording

public bool IsRecording { get; }

Checks whether PorcupineManager is capturing audio or not.

Returns

  • bool : If recording or not.

PorcupineManager.Delete()

public void Delete()

Free resources that were allocated to PorcupineManager.


PorcupineManager.FromBuiltInKeywords()

public static PorcupineManager FromBuiltInKeywords(
string accessKey,
IEnumerable<BuiltInKeyword> keywords,
Action<int> wakeWordCallback,
string modelPath = null,
IEnumerable<float> sensitivities = null,
Action<PorcupineException> processErrorCallback = null)

Creates an instance of PorcupineManager from built-in keywords.

Parameters

  • accessKey string : AccessKey obtained from Picovoice Console .
  • keywords IEnumerable<BuiltInKeyword> : List of built-in keywords to detect.
  • wakeWordCallback Action<int> : A callback that is triggered when one of the given keywords has been detected by Porcupine.
  • modelPath string : Absolute path to the file containing model parameters (.pv). If not set, default model is used.
  • sensitivities IEnumerable<float> : Sensitivities for detecting keywords. Each value should be a number within [0, 1]. A higher sensitivity results in fewer misses at the cost of increasing the false alarm rate. Default values are 0.5.
  • processErrorCallback Action<PorcupineException> : Callback that triggers is the engine experiences a problem while processing audio. If not set, errors will be printed to the Debug console.

Returns

  • PorcupineManager : An instance of the PorcupineManager class.

Throws

  • PorcupineException

PorcupineManager.FromKeywordPaths()

public static PorcupineManager FromKeywordPaths(
string accessKey,
IEnumerable<string> keywordPaths,
Action<int> wakeWordCallback,
string modelPath = null,
IEnumerable<float> sensitivities = null,
Action<PorcupineException> processErrorCallback = null)

Creates an instance of PorcupineManager from a list of Porcupine keyword file paths.

Parameters

  • accessKey string : AccessKey obtained from Picovoice Console .
  • keywordPaths IEnumerable<string> : A list of absolute paths to keyword model files (.ppn).
  • wakeWordCallback Action<int> : A callback that is triggered when one of the given keywords has been detected by Porcupine.
  • modelPath string : Absolute path to the file containing model parameters (.pv). If not set, default model is used.
  • sensitivities IEnumerable<float> : Sensitivities for detecting keywords. Each value should be a number within [0, 1]. A higher sensitivity results in fewer misses at the cost of increasing the false alarm rate. Default values are 0.5.
  • processErrorCallback Action<PorcupineException> : Callback that triggers is the engine experiences a problem while processing audio. If not set, errors will be printed to the Debug console.

Returns

  • PorcupineManager : An instance of the PorcupineManager class.

Throws

  • PorcupineException

PorcupineManager.Start()

public void Start()

Starts audio capture and wake word detection.

Throws

  • PorcupineException

PorcupineManager.Stop()

public void Start()

Stops audio capture and wake word detection.

Throws

  • PorcupineException

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Porcupine Wake Word — Unity API
  • Porcupine
  • BuiltInKeyword
  • FrameLength
  • SampleRate
  • Version
  • Dispose()
  • FromBuiltInKeywords()
  • FromKeywordPaths()
  • Process()
  • PorcupineException
  • PorcupineManager
  • IsAudioDeviceAvailable
  • IsRecording
  • Delete()
  • FromBuiltInKeywords()
  • FromKeywordPaths()
  • Start()
  • Stop()
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