Abstract

The present invention relates to an improvement of a delay control circuit of an ultrasonic diagnostic apparatus and is intended to provide a circuit configuration capable of utilizing a cyclicity of combination of signal lines, to absorb variations of a delay amount in accordance with a probe frequency by changing over a plurality of input ports corresponding to the frequencies of the probe which are provided for each of partial assemblies (delay control blocks) of delay lines at an input part of each assembly (delay control block), to confine crossings of signal lines within the partial assemblies of delay lines (delay control blocks) and to allow connection between partial assemblies of delay lines (delay control blocks) with a single signal line.