Ncr Corporation

Makoto Saruta

Tatsuhiro Suzuki

A passage is periodically scanned by a plurality of ultrasonic transmitters/receivers (sensors) arranged on the ceiling of the passage in two lines to calculate the height of an object to be measured to each sensor and the presence or absence of the measured object(s), moving direction(s) thereof, and the number thereof are reckoned from changes in sensed height and sensing time for each sensor induced by passing an object to be measured through the passage, and the position and a change in position with time of each sensor which senses the measured object concerned to count the number of passers-by in each moving direction. The presence or absence of the object to be measured and the number to be counted are decided in accordance with changes in sensed position and sensed height and the interrelation thereof, so that the number of sensors can be reduced and the number of passers-by can be counted at a high accuracy even when a plurality of persons pass under the sensors in a group.

Method of counting the number of passers-by

An optical wireless communications system includes a plurality of terminals each having a transmitter which transmits optical signals on a first carrier frequency and a receiver which receives optical signals on a second carrier frequency, and a plurality of optical repeaters each having a plurality of transmitters, a plurality of receivers and an optical signal destination determining structure, the optical repeaters being coupled to communicate with each other and with the terminals wherein each of the optical repeaters converts the carrier frequency of the received optical signals from one frequency to another frequency and transmits the latter frequency signals to all the terminals and to all the optical repeaters except the transmitting optical repeater of the latter frequency signals.

Growing community of inventors

Hiratsuka, Japan

Makoto Saruta