Porcupine Wake Word
.NET API

API Reference for the .NET Porcupine SDK (NuGet)

namespace: Pv

Porcupine

public class Porcupine : IDisposable { }

Class for the Porcupine Wake Word engine.

Porcupine.FromBuiltInKeywords()

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

Porcupine constructor when using built-in keywords.

Parameters

• accessKey string : AccessKey obtained from Picovoice Console.
• keywords IEnumerable<BuiltInKeyword> : List of built-in keywords for detection.
• modelPath string : Absolute path to the file containing model parameters (.pv).
• sensitivities IEnumerable<float> : Sensitivities for detecting keywords. Each value should be a number within [0, 1].

Returns

• Porcupine: An instance of Porcupine Wake Word engine.

Throws

• PorcupineException: If an error occurs while creating an instance of Porcupine Wake Word engine.

Porcupine.FromKeywordPaths()

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

Porcupine constructor when using keyword paths.

Parameters

• accessKey string : AccessKey obtained from Picovoice Console.
• keywordPaths IEnumerable<string> : List of absolute paths to keyword model files.
• modelPath string : Absolute path to the file containing model parameters (.pv).
• sensitivities IEnumerable<float> : Sensitivities for detecting keywords. Each value should be a number within [0, 1].

Returns

• Porcupine: An instance of Porcupine Wake Word engine.

Throws

• PorcupineException: If an error occurs while creating an instance of Porcupine Wake Word engine.

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 attained 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 keyword models provided to the constructor. If no keyword is detected then it returns -1.

Throws

• PorcupineException: If there is an error while processing the audio frame.

Porcupine.FrameLength

public int FrameLength { get; private set; }

Getter for number of audio samples per frame.

Returns

• int: Number of audio samples per frame.

Porcupine.SampleRate

public int SampleRate { get; private set; }

Getter for audio sample rate accepted by Picovoice.

Returns

• int: Audio sample rate accepted by Picovoice.

Porcupine.Version

public string Version { get; private set; }

Getter for version.

Returns

• String: Current Porcupine version.

BuiltInKeyword

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

List of available built-in wake words.

PorcupineException

public class PorcupineException : Exception { }

Exception thrown if an error occurs within Porcupine Wake Word engine.

Exceptions:

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