DIGITAL FREQUENCY SYNTHESISER FOR MULTIFREQUENCY TELEGRAPHY Russian patent published in 2015 - IPC H03B19/00 

FIELD: radio engineering, communication.

SUBSTANCE: digital frequency synthesiser for multifrequency telegraphy comprises first, second, third and fourth memory registers, a multiplexer, a digital storage, a code-to-sine function converter, a digital-to-analogue converter, a low-pass filter, a reference generator and a generation and delay unit. Digital inputs of the digital frequency synthesiser are the inputs of the first, second, third and fourth memory registers and the control input of the multiplexer, and the analogue output of the digital frequency synthesiser is the output of the low-pass filter.

EFFECT: faster operation and generation of multifrequency telegraphy signals.

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