Digital wave synthesizer

Claim 1

A digital wave synthesizer adapted to receive periodic pulses from a pulse generated source, such pulses occurring at a frequency of 2nf for providing a symmetrical waveform output at a frequency f, comprising: a. a unidirectional binary counter of n stages, having an input to receive the periodic pulses for providing output signals on n output lines; b. a code converter for receiving n output signals from the counter and the periodic pulses for providing 2n output signals in a predetermined sequential manner; c. output means for receiving the 2n output signals from the code converter and for responding to each of the 2n output signals to form the symmetrical waveform output; d. said output means further comprising a resistive ladder network having 2n resistances connected together at one end to a voltage reference source and separated at the other end to receive each of the 2n output signals of the code converter for providing 2n voltage signals at levels predetermined by the values of each of the 2n resistances, which in sequential occurrence produce the symmetrical waveform output; e. said code converter including decoder means for receiving and combining the n output signals of the counter and the periodic pulses for providing n output signals and the reciprocals thereof; f. combining means adapted to receive and combine the n output signals and reciprocals thereof from the decoder for producing the 2n output signals; and g. the decoder means further comprising n Exclusive-NOR circuits and n inverter circuits, the n Exclusive-NOR circuits being adapted to receive and combine the n outputs from the counter and the periodic pulses, and each providing an output to the combining means and to a respective one of the inverter circuits, each of the n inverter circuits for providing an output to the combining means.