Abstract: A single antenna is used so that time-division transmission and reception is carried out in a radar apparatus for obtaining a distance and a relative speed with respect to a target object based on a beat signal obtained by transmitting a frequency modulated signal and mixing a received signal reflected by said target object with the frequency modulated signal that is transmitted.

Abstract: Abnormal conditions of the operating members of an automotive vehicle are detected by a plurality of sensors provided at the operating members. Detection signals of the sensors are fed as input to a plurality of warning issuing devices of the vehicle warning system. A priority sequence judging circuit is connected between the sensors and the warning issuing devices. The priority sequence judging circuit operates when more than one of the sensors detect abnormal conditions simultaneously, determines the degree of importance of the detected signals from the sensors and preferentially provides the most important signals as outputs to the warning issuing devices in accordance with the order of their importance. A check circuit is connected to the warning issuing devices.

Abstract: A vehicle alarm system provides an audible alarm in the audio reproduction system of a vehicle when an abnormal condition is detected in an operating part of the vehicle. A sensor at each monitored operating part detects an abnormal condition occurring thereat and produces an abnormal condition signal when detecting such a condition. The abnormal condition signals from the sensors are supplied as inputs to an alarm signal supply circuit which produces alarm signals having different frequencies. A switching circuit switches the audio reproduction system from audio signals to an alarm signal upon the receipt of an abnormal condition signal from a sensor. The alarm signal supply circuit then supplies an alarm signal to the audio frequency amplifier of the audio reproduction system. When a plurality of sensors detect abnormal conditions simultaneously, a priority sequence judging circuit determines the degree of importance of each alarm signal and the priority sequence of the abnormal condition signals.

Abstract: A radio receiver tuning control system automatically selects a desired station through digital operation. A counting value based on the local oscillating frequency signal of the local oscillator of a receiver is compared, digit by digit, with a value corresponding to a specified frequency signal of a predetermined desired station. The local oscillator is controlled in order to maintain coincidence between the counting value and the specified value in accordance with the comparison result.