DEVICE TO FORM SIGNALS OF TWO- AND FOUR-FREQUENCY TELEGRAPHY Russian patent published in 1999 - IPC

FIELD: radio engineering, transmitting equipment for telegraphic communication. SUBSTANCE: device to form signals of two- and four-frequency telegraphy includes multiplexer to which controlling input outside instruction comes, third storage and first multiplier connected in series, fourth storage and second multiplier connected in series, adder whose inputs are connected to outputs of multipliers, address counter, fifth and sixth storages whose inputs are connected to output of address counter and whose outputs are connected to second inputs of multipliers. Inputs of third and fourth storages are connected to output of collecting adder. Outputs of adder and first storage are linked to first and second inputs of multiplexer correspondingly and output of multiplexer is connected to input of digital- to-analog converter. Clock input of address counter is connected to output of multitap frequency divider. EFFECT: provision for formation of multifrequency signal of two- and four-frequency telegraphy. 2 dwg