Abstract: This invention relates to a waveform observation apparatus such as an oscilloscope, and more particularly to a waveform observation apparatus suitable for a liquid crystal oscilloscope having a liquid crystal display of low power consumption.The waveform observation apparatus comprises at least a waveform memory in which a waveform data is to be written, an input circuit to control the waveform memory to write the waveform data therein and a power supply circuit to drive the waveform memory and the input circuit. The power supply circuit includes means to only intermittently apply the power supply voltage for at least part of the input circuit for a time necessary for writing a waveform. This causes the power consumption to be lowered.

Abstract: Disclosed is a matrix display device comprising: a matrix display panel having a plurality rows of row electrodes and a plurality column of column electrodes and a display medium interposed therebetween, crosspoints of the row electrodes and the column electrodes defining picture cells arranged in matrix, each column of the column electrodes opposing to respective one column of the matrix picture cells being divided into a plurality of groups with a predetermined regularity and electrically interconnected within each group, terminals of at least two groups of column electrodes of the plurality of groups of column electrodes being arranged to extend to the same side of the matrix display panel; a row electrode drive circuit for producing row electrode drive signals to be applied to the row electrodes in accordance with a video data; a column electrode drive circuit for producing column electrode drive signals to be applied to the at least two groups of column electrodes in accordance with the video data; a vid

Abstract: A serial-parallel converter for storing sequentially a serially input digital signal in a predetermined number of elements and producing the stored data at one time as a parallelly output digital signal. The serially input digital signal is sequentially written in memory cells having addresses designated by an address counter adapted to count the write-in timing pulses. Upon completion of the write-in operation to all the memory cells, contents stored in all the memory cells are read out at one time as a parallelly output signal.

Abstract: A structure of a multi-matrix display panel having picture elements arranged in matrix and a multimatrix display system using the matrix display panel are disclosed. Scanning signals are applied to a plurality of row electrodes of the matrix and brightness modulated signals are applied to a plurality of column electrodes of the matrix to control the brightnesses of desired picture elements. The sequence of connection of the column electrodes to the picture elements is reversed from row electrode to row electrode and the sequence of application of drive signals for driving the matrix display panel is also reversed accordingly. The opposing picture elements in two adjacent rows are integrated to reduce the number of picture elements for providing a structure which does not need three-dimensional interconnection of the electrodes or a detoured wiring.

Abstract: Apparatus for detecting the number of objects such as persons in which at least one ultrasonic wave signal transmitter-receiver is used to transmit ultrasonic wave signals toward objects the number of which is to be detected, and to process waves reflected therefrom, thus determining the number of such objects existing within a predetermined area. When plural ultrasonic wave transmitter-receivers are used, they are so arranged that their detection regions are partly overlapped, thereby assuring uniform detection sensitivity over the area. A detection time is reduced by simultaneously driving the ultrasonic wave signal transmitter-receivers. The ultrasonic wave transmitter and receiver of each transmitter-receiver may be directed to different points in a target plane within a range permitting the receiver to receive reflected ultrasonic wave signals, thereby equalizing the detection sensitivity in the direction of the difference, thus improving the detection accuracy.

Abstract: A bogie is provided with a center detection coil, a right-hand detection coil and a left-hand detection coil in order to make the vehicle to run automatically along an electro-magnetic induction line installed in a running path in dependence on a steering signal produced by composing a vector of a voltage induced in the center detection coil by the magnetic flux generated by the induction line and a vector of selected one of the induced voltages of the right-hand and the left-hand detection coil. A correcting circuit is provided to produce a correcting voltage signal added to the steering signal so that the latter signal becomes zero when the center detection coil is positioned directly above the induction line.

Abstract: Apparatus for detecting the number of objects such as the number of persons located within a predetermined area. Ultrasonic wave is emitted toward the objects, the number of which is to be determined, and the reflected waves from the objects are received by a receiver. Among the received reflection waves, the waves having an amplitude greater than a predetermined peak value are derived as the useful reflection wave signal having a constant peak value. The number of the objects is determined based on the quantity of the derived reflection wave signals having the constant peak value. By emitting the ultrasonic wave for every unit time, the derived reflection wave signals having the constant peak value may be averaged by means of a smoothing circuit.

Abstract: An electromagnetic guidance system used, for example, for guiding a driverless mobile vehicle. For example, a two-core wire or cable is in the surface of a travelling course. The core conductors of the two-core wire are connected at its end so that current may circulates through the conductor. By detecting the magnetic flux induced by the circulating current by means of detecting coils mounted on the driverless mobile vehicle, the vehicle can be automatically run along the two-core wire without any change-over operation.