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FX663

Call Progress Decoder

CML Microsystems Plc 

CML Semiconductor Products

Call Progress Decoder

FX663

1.0 Features

• Decodes Call Progress Tones

Worldwide covering:

• Single and Dual Tones

• Fax and Modem

Answer/Originate Tones

• Special Information Tones

• Fast 'US Busy' Tone Detector

D/663/3 January 1999

Provisional Issue

• Low-Power (3 Volt) Operation

• Adjustable Detection Threshold

• Voice Detector

• Standard 3.58MHz Xtal/Clock Input

• 16-Pin SOIC and DIP Packages

1.1 Brief Description

The FX663 decodes the standard audible tone signals provided by telecom systems worldwide to indicate Dial,

Ringing, Busy, Unobtainable and other stages of a call attempt. It provides the key features needed for

intelligent, full-function, call progress monitoring by applications involving machine dialling or automatic call

placement. The FX663 also incorporates the following features:

• Single and dual tone decoding for better cross-system Call Progress monitoring.

• "US Busy" tone detector, saving time needed for "cadence verification" under Busy and Unobtainable

conditions. This incorporates a separate 620Hz detector for improved response.

• A detector to indicate speech and non-call progress signals; this reduces voice falsing of call progress

tones and adds Voice-Answer detection as a "connected" prompt.

• A fax and modem tone decoder.

• A separate, adjustable threshold, signal-level detector which reduces noise falsing.

The FX663 uses new digital signal processing techniques to provide these advantages. It is a low cost, low

power product with superior performance. It is available in industry standard 16-pin packages.

© 1999 Consumer Microcircuits Limited

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