Abstract: A transportation safety apparatus and method for the detection of obstacles which lie off the line-of-sight or beyond the field of view of a moving vehicle entails shooting a laser beam through the air from a moving vehicle, capturing the beam and passing it to a fiberoptic relay which transmits a laser pulse to a distant site, and receiving a reflection thereof if the site is clear of obstacles. The pulses are received within about 10-20 microseconds per kilometer of relay length from the time of launching, permitting monitoring of the probe-site in real-time.

Abstract: An electronic obstacle detection system for guiding and warning a motorist of obstacles in the detection area while backing-up. The main components of the system include a pair of sensor clusters to be affixed to the rear of the vehicle, a pair of exterior visual indicators, and an audio-visual indicator located in the vehicle. Each of the sensor clusters are encased in a housing having angled, stepped portions configured to provide complete area coverage of transmitted and received signals.

Abstract: An FM stereo receiving device according to the present invention has an object to be able to demodulate a stereo signal in a state close to a monaural reception, in which a pilot signal is extracted from an FM-demodulated output; a subcarrier signal is formed, based on this pilot signal; IF signals are switched intermittently by this subcarrier signal; and intermittent IF signals are IF-detected to obtain intermittent signals of base-band signals.These intermittent signals are switched by means of two switches, based on a subcarrier signal. Low frequency components of each output audio signal are extracted to obtain left and right signals EL and ER through a de-emphasis circuit.Owing to this device, it is possible to enlarge a reception region for an FM stereo broadcast with a high sensitivity.