A signal wave forming circuit.

摘要

An arbitrary wave forming circuit produces signals of arbitrary waveforms (sine, triangular or trapezoidal waves) and arbitrary frequencies. A random access memory (121) stores wave formation information on the waveform. According to the wave formation information stored in the memory (121), the updating or keeping of a digital value in an increment/decrement circuit (123) is controlled and the digital value is digital/analog-converted by a digital/analog conversion circuit (124), which is controlled by a digital value control means that includes the increment/decrement circuit (123). By writing appropriate wave formation information into the memory (121), it is possible to produce signals of desired waveforms. <IMAGE>