Nec Corporation (Total 5013 Patents Found)

A radio communication apparatus includes a power supply device which includes a solar battery connected to each of communication channels via a different switch. A controller constantly monitors the voltage of the solar battery to turn on or off the switches stepwise, so that the number of active channels is reduced st...
A base station (coast station) of such a radiotelephone system as a maritime mobile radiotelephone system is connected to a telephone exchange of a public telecommunication network. A ringing signal from a subscriber's station of the telecommunication network which is connected to the exchange is transmitted to an ...
An automatic gain controlling circuit is associated with magnetic heads (L1/ L2) for recording and reproducing pieces of video data information on a magnetic tape (MT), and an in-phase current component is eliminated from a recording current flowing into one of the magnetic heads (L1/ L2) through a differential amplifi...
In a data processing device for use in a carrier transmission system in processing a device input signal of a plurality of channels, a single data processing circuit (21) and a multiport RAM (33) are used together with a write and read clock counter (51(1)) in place of a great number of data processing circuits, equal ...
A semiconductor memory unit suitable to be employed in a microcomputer system includes an address counter for fetching address information from an microcomputer in response to an address latch signal from the microcomputer. The address counter further receives an updating control signal from the microcomputer and...
The invention provides a transistor circuitry comprising an input terminal (10) for receiving both an input signal in the range from a first voltage level and a second voltage level higher than the first voltage level and for subsequent receipt of a high constant voltage having a third voltage level higher than the sec...
In an apparatus for processing information by executing a selected operation selected from a plurality of processing operations, a detecting arrangement (11) detects a selected position in a predetermined area having a first and a second area and produces a coordinate value representative of the selected position. A di...
In a method for selectively growing a semiconductor substrate, a substrate is selectively grown by a MOVPE (Metal Organic Phase Epitaxial Growth) method using DMA1H as aluminum material. A semiconductor substrate is selectively grown by a MOVPE (Metal Organic Phase Epitaxial Growth) method using TMA (Tri-Methyl-Aluminu...
There is disclosed a control method for a cordless telephone system including a main apparatus connected to a telephone line and having a line control function, a plurality of stationary apparatuses connected to the main apparatus and each having a radio transmitter/receiver, and portable telephones capable of co...
An artificial random-number pattern generating circuit has a plurality of flip-flops (11-14; 11-15) each having a set signal input terminal and a clock signal input terminal; a plurality of selectors (21-23,25,27; 21-24,26,28) each of which forwards its output to the corresponding flip-flop and receives a first operati...
An amount of money which should be charged on reception of a pay television signal or a like charged information signal, is calculated by a charging device comprising a calculator (25) for calculating an amount of charge as the amount of money and an encoder (28) for encoding the charge and time instants by a key code ...
An optical transmission system of an N : 1 or an N : N type is provided, in which there is no deterioration caused by beat noise between signals. A plurality of optical modulators (110,210,310) are cascaded in an optical fiber transmission path (10) having a light source (20) and a light receiver (40) connected to two ...
In a multifunctional pager receiver comprising a processing circuit (30) operable in a plurality of modes of operations, each mode is selected by manual switches (51, 62-64) smaller in number than the modes. A combination of successive manual operations of the switches changes the modes from an intermediate one to a fi...