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Texas Instruments General-Purpose Tone Decoding and DTMF Detection ( Contains Scanned Text) Application notes
General-Purpose Tone
Decoding and DTMF
Detection
APPLICATION REPORT: SPRA082
Craig Marven
Regional Technology Center
Bedford, England
Texas Instruments
Digital Signal Processing Solutions
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CONTACT INFORMATION
US TMS320 HOTLINE
(281) 274-2320
US TMS320 FAX
(281) 274-2324
US TMS320 BBS
(281) 274-2323
US TMS320 email
dsph@ti.com
General-Purpose Tone Decoding and
DTMF Detection
Abstract
This report describes a single-chip solution for concurrent DTMF
and general-tone decoding or expanded, general-tone decoding
only. These facilities are provided on a special program on the
TMS320C17 or TMS320E17. The term TMS320C17 applies to
both throughout the report.
The report covers the following topics:
q Theory of Operation
n Software
n TMS320C17 Features
n Hardware
q Implementation
n Software Implementation
n Utilization of TMS320C17 Resources
n Hardware Implementation
q Host Interface
n Host Write Cycle
n Host Access Considerations
n Host Interface Registers
n Register Read Functions
SPRA082
q Applications and Customization
n Secure Off-Site Control
n Call Monitoring
n DTMF Telephone Tester
n Customization for User Applications
n Flexibility through Programmability
q Conclusions and References
The report also includes the following appendixes:
6
q Appendix A
Tone Detector Source Code
q Appendix B
PC Application Program
q Appendix C
Power Detector Operational Considerations
General-Purpose Tone Decoding and DTMF Detection
SPRA082
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General-Purpose Tone Decoding and DTMF Detection
7
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