Detectors, Generators
and Timers

6.1 Introduction

6.2 DTMF and Tone Generation

6.2.1 System Restrictions

6.3 DTMF Detector

6.4 Echo Cancellation

6.4.1 Enabling the Echo Canceller

6.4.2 Using the Alternate DTMF Detector to Improve Talk-off

6.5 Energy Detector

6.6 Tone Detectors

6.7 Call Progress

6.7.1 Call Progress Tone Events

6.7.2 Call Progress Voice Events

6.7.3 Terminating Call Progress

6.7.4 System Restrictions

6.8 Frequency Shift Key (FSK) Data

6.8.1 Transmit Function

6.8.2 Receiver Function

6.9 Low Level Control

6.10 Timers

Copyright 1996 Natural MicroSystems, Inc. All Rights Reserved.