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Chapter 6

Voice Record and Playback Functions

6.1 Introduction
6.2 Voice Encoding Formats
6.2.1 Buffer Sizes
6.2.2 Underruns
6.3 Data Transfer Methods
6.3.1 Single Memory Transaction
6.3.2 Asynchronous Data Transfer
6.3.3 Callback Data Transfer
6.4 Using DTMF Tones
6.4.1 DTMFabort Mask
6.5 Using the Voice Play Functions
6.5.1 Voice Play Parameters
6.5.2 Initiating a Play Operation
6.5.3 Terminating a Play Operation
6.5.4 Playing Voice Data in Callback Mode
6.5.5 Playing Voice Data in Asynchronous Mode
6.5.6 Controlling Gain During a Play Operation
6.5.7 Controlling Speed During a Play Operation
6.6 Using the Voice Record Functions
6.6.1 Voice Record Parameters
6.6.2 Initiating a Record Operation
6.6.3 Terminating a Record Operation
6.6.4 Data Transfer Using Callback Mode
6.6.5 Data Transfer Using Asynchronous Mode
6.6.6 Recording with Automatic Gain Control
6.7 System Restrictions
6.7.1 Delays in Data Processing

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