Transmission/reception control device

A transmission/reception control device that controls transmission and reception in an ultrasonic sensor including an ultrasonic transducer configured to transmit a probe wave as an ultrasonic wave and receive a reception wave including a reflected wave of the probe wave, comprising:

• a transmission frequency setting unit that sets a frequency of the probe wave to a transmission frequency different from a resonance frequency of the ultrasonic transducer;
• a reception signal processing unit that processes a reception result of the reception wave based on the probe wave transmitted with the transmission frequency;
• and
• an object detection unit that detects an object based on a result of processing by the reception signal processing unit;
• a reverberation time acquisition unit that acquires a reverberation time of the ultrasonic transducer, wherein
• when the reverberation time exceeds a threshold in response to execution of a frequency, decreasing process of setting the transmission frequency to be lower than the resonance frequency, the transmission frequency setting unit executes a frequency increasing process of setting the transmission frequency to be higher than the resonance frequency, and
• when the reverberation time exceeds the threshold in response to execution of the frequency increasing process, the transmission frequency setting unit executes the frequency decreasing process.