Software for Telecoms & Audio
Exchange Tone Detector DSP C Code
the AlgoTron Exchange Tone Detector (ETD) C code is for tones such as
dial-tone and busy tone that emanate from standard PSTN telephone exchanges.
The ETD determines on a sample-by-sample basis whether exchange tone(s)
are present or not, leaving the user to monitor for tone cadences if needed
eg for busy tone. Because of the variety of tone signals in different
countries, a measure of programmability is given to the user. The corner
frequencies of the band-pass can be selected from a family of filters.
- #example figures from compiling for the TI TMS320C5000(C55x) DSP processor at 8.0kHz sampling
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