Digital Signal Processor: Tone Detection for CCITT No. 5 Transceiver
Renato N. Gadenz · Bell System Technical Journal · 1981
This paper describes the application of a recently developed large-scale-integration digital signal processor, the DSP, to tone detection in a proposed digital CCITT No. 5 signaling unit. The design of the digital filters required in the receiver is discussed and an algorithm presented for tone detection. Two channels per DSP can be accommodated by using a sampling frequency of 8 kHz and a DSP clock of 5MHz.