JPS5459054A - Function generator - Google Patents

Abstract

PURPOSE:To minimize the size of the hardware as well as to avoid the distortion of the output waveform by constituting the circuit of the time function generator used to the communication equipment and the like without including the multiplier. CONSTITUTION:Adder 12 functions to add the constant given from constant memory 11 to the 1-clock preceding output of shift registr 13. Decoder 14 decodes the output of register 13, and detects to which level among a0-a5, for instance, the output waveform has arrived to alter the addresses read out from memory 11 according to each level and then to vary the constant to be applied to adder 12. The digital word is produced at output terminal 15 and then converted to another waveform through D-A converter. The action timing is regulatd by a fixed clock for each of above mentioned component elements 11-14. Thus, no multiplier is used for the circuit, so the size of the hardware can be minimized. Furthermore, the distortion of the output waveform caused by the accumulation of the noise mixing in when gathering the multiplication results can be prevented.