A real-time digital detector for bifrequential coded signallings

Author

Bruni, Y. ; Gervasutti, T. ; Offelli, C. ; Petri, D.

Author_Institution

Network Control Syst., Padova, Italy

fYear

1991

Firstpage

476

Abstract

It is shown that the detection of bifrequential codes in telephonic signals can be advantageously carried out by means of numerical algorithms. The input samples are weighted with the Hanning window and shifted in frequency in order to minimize the leakage errors introduced because of the finite time record length. The detection algorithm efficiency is very high because analyzed sequences remain real-valued still after the frequency shift and because only the spectrum samples of interest are evaluated. The characteristics of the adopted CPUs affect the real-time performances; nevertheless, several telephonic channels can be monitored with a first-generation DSP

Keywords

encoding; signal detection; signalling (telecommunication networks); telecommunication channels; telephone networks; CPU; DSP; Hanning window; bifrequential coded signallings; detection algorithm; frequency shift; input samples; leakage errors; real-time digital detector; spectrum samples; telephone networks; telephonic channels; telephonic signals; Buffer storage; Decoding; Detectors; Digital signal processing; Frequency; Hardware; Instruments; Monitoring; Signal processing algorithms; Telecommunication traffic;

fLanguage

English

Publisher

ieee

Conference_Titel

Electrotechnical Conference, 1991. Proceedings., 6th Mediterranean

Conference_Location

LJubljana

Print_ISBN

0-87942-655-1

Type

conf

DOI

10.1109/MELCON.1991.161880

Filename

161880