AN2384 Freescale Semiconductor / Motorola, AN2384 Datasheet

AN2384

Manufacturer Part Number

AN2384

Description

Generic Tone Detection Using Teager-Kaiser Energy Operators on the StarCore SC140 Core

Manufacturer

Freescale Semiconductor / Motorola

Datasheet

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Freescale Semiconductor

Application Note

Generic Tone Detection Using Teager-

Kaiser Energy Operators on the

StarCore SC140 Core

By Valentin Emiya, Lúcio F.C. Pessoa, Delphine Vallot, and David Melles

This application note presents the use of the Teager-Kaiser (TK)

energy operator [1] for generic tone detection. The TK operator

can be used to build fast and efficient multi-frequency tone

detectors with a high degree of accuracy and low cost, making it

ideal for infrastructure applications such as media gateways.

The generic tone detector is both versatile and flexible. The

Freescale theoretical study is backed up by Matlab simulations

and real-time implementations on Freescale DSPs based on the

StarCore™ SC140 core. This study demonstrates that the TK

operator can detect tones composed of many frequencies. The

implementation discussed in this application note runs on the

MSC8101 device, which is the first member of the StarCore

family of digital signal processors (DSPs). The MSC8101

device uses the four ALU SC140 core, 512 KB of internal

SRAM, and the popular communications processor module

(CPM) of the Freescale Power QUICC II™ (MPC8260) device.

CONTENTS

4.1

4.2

5.1

5.2

5.3

Tone Detection Basics ............................................2

Multi-Component Tone Detection ..........................3

Two-Component Tone Detector for DTMF ............6

DTMF Detector on StarCore ...................................8

ITU-T Recommendation Q.24 ................................9

Adaptations to Recommendation Q.24 .................10

Functional Interface ..............................................20

fsl_dtmf_det_init ...................................................20

fsl_dtmf_det ..........................................................20

Code Size and Performance ..................................20

Using the DTMF Detector ....................................21

DTMF Q.24 Compliance Tests .............................23

Conclusion ............................................................26

References............................................................. 27

Rev. 1, 12/2004

AN2384

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