IMPROVING 32-CHANNEL DTMF DECODERS IN PBX SYSTEMS USING THE TMS320C5X DSPUsing a DSP to perform multi-channel DTMF decoding can decrease PBX system cost while increasing system performance and flexibility. This document presents an improved technique for 32-channel DTMF decoding using the TMS320C5x 16-bit fixed-point DSP. The appendix contains the assembler source code for this application. View the complete PDF document: spra085.pdf (78 K Bytes) (Requires Acrobat Reader 3.x) Go to the Engineering Design Center to locate information on other TI Semiconductor devices.
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