Cheetah Speech-to-Text
Java API

API Reference for the Java Cheetah SDK (cheetah-java)

package: ai.picovoice.cheetah

Cheetah

public class Cheetah { }

Class for the Cheetah Speech-to-Text engine.

Cheetah must be initialized using the Builder() Class. Resources should be cleaned when you are done using the delete() function.

Cheetah.delete()

public void delete()

Releases resources acquired by Cheetah.

Cheetah.getFrameLength()

public int getFrameLength()

Getter for number of audio samples per frame.

Returns

• int: Number of audio samples per frame.

Cheetah.getSampleRate()

public int getSampleRate()

Getter for required audio sample rate for PCM data.

Returns

• int: Required audio sample rate for PCM data.

Cheetah.getVersion()

public String getVersion()

Getter for version.

Returns

• String: Current Cheetah version.

Cheetah.process()

public CheetahTranscript process(short[] pcm) throws CheetahException

Processes a frame of audio and returns newly-transcribed text and a flag indicating if an endpoint has been detected. Upon detection of an endpoint, the client may invoke .flush() to retrieve any remaining transcription.

The number of samples per frame can be attained by calling .getFrameLength(). The incoming audio needs to have a sample rate equal to .getSampleRate() and be 16-bit linearly-encoded. Furthermore, Cheetah operates on single-channel audio.

Parameters

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

Returns

• CheetahTranscript: Inferred transcription object.

Throws

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

Cheetah.flush()

public CheetahTranscript flush() throws CheetahException

Processes any remaining audio data and returns its transcription.

Returns

• CheetahTranscript: Inferred transcription object.

Throws

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

Cheetah.Builder

public static class Builder {
    public Builder(String accessKey) { }
}

Builder for creating an instance of Cheetah with a mixture of default arguments.

Parameters

• accessKey String : AccessKey obtained from Picovoice Console.

Cheetah.Builder.build()

public Cheetah build() throws CheetahException

Creates an instance of Cheetah Speech-to-Text engine.

Returns

• Cheetah: An instance of Cheetah Speech-to-Text engine.

Throws

• CheetahException: If an error occurs while creating an instance of Cheetah Speech-to-Text engine.

Cheetah.Builder.setAccessKey()

public Cheetah.Builder setAccessKey(String accessKey)

Sets the AccessKey of the builder.

Parameters

• accessKey String : AccessKey obtained from Picovoice Console.

Returns

• Cheetah.Builder: Modified Cheetah.Builder object.

Cheetah.Builder.setModelPath()

public Cheetah.Builder setModelPath(String modelPath)

Sets the model path of the builder.

Parameters

• modelPath String : Absolute path to the file containing model parameters (.pv).

Returns

• Cheetah.Builder: Modified Cheetah.Builder object.

Cheetah.Builder.setLibraryPath()

public Builder setLibraryPath(String libraryPath)

Sets the library path of the builder.

Parameters

• libraryPath String : Absolute path to the native Cheetah library.

Returns

• Cheetah.Builder: Modified Cheetah.Builder object.

Cheetah.Builder.setEndpointDuration()

public Cheetah.Builder setEndpointDuration(float endpointDuration)

Sets the endpoint duration of the builder. A speech endpoint is detected when there is a chunk of audio (with a duration specified herein) after an utterance without any speech in it. Set duration to 0 to disable this. Default is 1 second.

Parameters

• endpointDuration float : Duration of endpoint in seconds.

Returns

• Cheetah.Builder: Modified Cheetah.Builder object.

Cheetah.Builder.setEnableAutomaticPunctuation()

public Cheetah.Builder setEnableAutomaticPunctuation(boolean setEnableAutomaticPunctuation)

Setter for enabling automatic punctuation insertion.

Parameters

• enableAutomaticPunctuation boolean : Set to true to enable automatic punctuation insertion.

Returns

• Cheetah.Builder: Modified Cheetah.Builder object.

CheetahTranscript

public class CheetahTranscript { }

Class that contains Cheetah transcript data.

CheetahTranscript.getTranscript()

public string getTranscript() { }

Getter for transcript data.

Returns

• string: Inferred transcription.

CheetahTranscript.getIsEndpoint()

public boolean getIsEndpoint() { }

Getter for isEndpoint flag.

Returns

• boolean: If true, Cheetah detected a speech endpoint.

CheetahException

public class CheetahException extends Exception { }

Exception thrown if an error occurs within Cheetah Speech-to-Text engine.

Exceptions:

public class CheetahActivationException           extends CheetahException { }
public class CheetahActivationLimitException      extends CheetahException { }
public class CheetahActivationRefusedException    extends CheetahException { }
public class CheetahActivationThrottledException  extends CheetahException { }
public class CheetahIOException                   extends CheetahException { }
public class CheetahInvalidArgumentException      extends CheetahException { }
public class CheetahInvalidStateException         extends CheetahException { }
public class CheetahKeyException                  extends CheetahException { }
public class CheetahMemoryException               extends CheetahException { }
public class CheetahRuntimeException              extends CheetahException { }
public class CheetahStopIterationException        extends CheetahException { }