GENERATOR FOR GENERATING A NUMBER OF SELECTED FREQUENCIES

摘要

A generator for generating a number of selected frequencies, comprising a pulse oscillator and a number of dividers which are connected thereto, a second number of dividers which also coupled to the former dividers via a switching network in order to adjust, under the control of the switching network, dividends which produce desired combinations of frequencies derived from the oscillator frequencies, in particular tone frequencies for tone pushbutton selection signalling, the dividers of the second group also being binary-to-digital signal converters to which first-order RC-networks are connected in order to suppress higher harmonics.