SAPI Technical Article
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Research-Lab's approach
Preface

This article is being written in response to the assignment to carry out the complete research on various issues related to SAPI  for Research-Lab's upcoming  product's campaign.
This article is going to cover the important SAPI  issues, services, products, service providers and Research-Lab's approach to SAPI.
Research is focused on the following points
SAPI...general definition

SAPI stands for Service Access Point Identifier. An address used at layer 2 to manage different data types for the same individual device connecting to the ISDN network. The SAPI and TEI together form the layer 2 address. 

In detail SAPI  is a programming standard that provides tools and components to speech recognition and text-to-speech software applications. Speech recognition applications allow a computer to respond to spoken commands or to write text in response to spoken words. Text-to-speech applications allow a computer to synthesize a voice that speaks words that are in a string or text file.
 

Architectural details

SAPI is a specification for both Engine and Application developers. Speech engine developers can make their engines SAPI compliant by implementing the Engine level interfaces. Application developers use the Application level interfaces provided by SAPI to access the features of the underlying engine. 

Advantages of SAPI

SAPI has following advantages 

  1. Standard Specification - Adoption enables compliance with several speech engines, without additional development effort.
  2. COM based API - Supports application development and scripting. No learning curve in terms of implementation.
  3. Oriented towards feature-rich desktop applications.

 
Disadvantages of SAPI
  1. Limited to Microsoft Platform.
  2. No direct server-side implementation - Default implementation limited to a single user deployment scenario. The interfaces are not designed for large portal development with multiple access points.
  3. Engine specific profiles - User Profiles can't be ported across speech engines, as SAPI does not define standards for profile storage. Thus, Training required for each user on each engine.

 
SAPI & applications

SAPI is applicable for the interfaces of Speech Recognition and Text To Speech applications

Speech Recognition
 Each speech recognition application requires speech recognizer object for encapsulating recognition engine.

Text To Speech
 SAPI exposes a single interface for its TTS functionality, ISpVoice. The engine vendor supplies its TTS engine with a set of one or more voices. These voices can be characterized using a set of attributes such a Male/Female, Adult/Child, and language supported by the voice. When created, the ISpVoice object is ready to use with the default voice specified under the Control Panel's Speech settings dialog. Once created, however, the voices can be changed. SAPI provides methods to query for available voices on the engine.
SAPI Implementation Consideration

You can include the Speech API feature in your platform by choosing the feature from the Catalog. Choosing the Speech API feature sets the appropriate environmental variable for enabling the feature.

The following table shows the Sysgen variables that enable the Speech API feature.

Sysgen variable

Description
SYSGEN_SPEECH When this variable is set, the Speech API feature is included in the OS image.

When this variable is not set, the Speech API feature is excluded from the image.

 
SYSGEN_SPSRENG When this variable is set, the speech recognition engine feature is enabled.
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