Introduction

The SimpleLink SDK Voice Detection Plugin provides a speech recognition library called Voice Command Detection (VCD). The VCD Library implements a fixed-point low-resource speaker-dependent speech recognizer targeted toward embedded processors. The Library provides easy-to-use APIs that can voice enable applications. This document describes the VCD Libarary APIs. For information on using VCD consult the User's Guide.

The VCD Library uses a voice activity detection library, VAD, which is included with the Speech Recognition Project. The VAD Library can be used independently on its own to locate audio activity above background noise levels. Documentation for the VAD Library is included in this document.

VCD Library Features

Capabilities

The VCD Library software provides a comprehensive set of APIs for speaker-dependent speech recognition for a wide variety of embedded applications. VCD APIs allow an application to perform the following operations.

• Create speaker-defined phrase models
• Train a phrase model with additional audio data to improve performance
• Delete a model
• Enable or disable specific models during recognition search
• Obtain information about a model
  • VCD provides the size, name, amount of training, and whether a model is enabled, along with a count of the total number of models.
  • During enrollment, VCD provides a quality measure that estimates how likely the model is to perform well in the recognizer.
• Run recognition search
  • The application can utilize VCD APIs to run the search continuously, or the search can be suspended after a phrase is recognized. The latter method can be used to implement a "push-to-talk" mode of operation.
• Set parameters to tune recognizer performance
• Optional write/read model data to/from a file
  • A version of the library with this feature enabled is not currently supplied.

Using VCD

Using the VCD Library software requires operations outside the recognizer, such as allocating memory for models and processing, and collecting audio data in real-time to provide to the VCD APIs. The User's Guide specifies the requirements that must be met. It is important to consult the User's Guide.

The VCD software includes example program source code that illustrates usage of VCD and provides code that can assist in setting up VCD properly.

For More Information

• For more information on the application, and available evaluation kits see the download page.
• For technical support
  • Visit the MSP430 E2E forum