Yozan Corporation

Other

Sharp Kabushiki Kaisha Corporation

Tokyo Denki University

Hitachi, Ltd.

Hitachi Automotive Systems, Ltd.

Kunihiko Suzuki

Changming Zhou

Guoliang Shou

Xuping Zhou

Takashi Tomatsu

Makoto Yamamoto

Jie Chen

Xiaoling Qin

Mamoru Sawahashi

Sunao Takatori

Fumiyuki Adachi

Kazunori Motohashi

Hideo Tomita

Shinzo Yoshimura

Masataka Tanimitsu

Shuji Obata

Xiaoxing Zhang

Masataka Fukui

This portable electromagnetic induction heating device is used to carry an induction current in a conductor, make the conductor generate heat by Joule's heat, and heat adhesive by the heat generating conductor. A heating induction coil () is formed by a plurality of coil bodies (-and-), the respective coil bodies can change mutually center-to-center distances. Simultaneously, by changing any one of polarities thereof, a polarity and a position of a magnetic force line generated by the conductor are changed, whereby a heating state of the adhesive can be changed depending on a region of the adhesive.

Portable electromagnetic induction heating device

A matched filter having a set of registers to successively store a digital voltage. The matched filter includes a cumulative shift register, a number of exclusive-or circuits, and an analog adder. The cumulative shift register has a number of stages in which each stage has one bit corresponding to the shift register. The exclusive-or circuits each perform an exclusive-or function on each bit of the digital data and the one bit coefficient while the analog adder sums outputs from the exclusive-or circuits.

Matched filter circuit

An analog calculation circuit in a filter circuit is corrected in the calculation error by estimating the error from a calculation result of known inputs and known multiplier. A multiplier is changed according to the estimated error. The filter circuit has a voltage to current converter at an input side and a current to voltage converter at an output side and a calculation of current is performed therein.

Filter circuit utilizing a plurality of sampling and holding circuits

Matched filter bank

A receiver for spread spectrum communication system receives a traffic channel and common control channel by a plurality of matched filters at least one of which is selectively available for the traffic or the common control channel. At the initial acquisition, a plurality of matched filters are used for receiving the common control channel. At the hand-over, a plurality of matched filters are used to receive traffic channels of the current base station and the base stations in the adjacent cells.

Spread spectrum communication system

An analog to digital converter comprises a differential input portion that receives an input voltage and a reference voltage and has a first and second output terminals, a positive feedback portion connected to said first and second output terminals, a buffer if CMOSFETs connected at its input to the first output terminal, a second buffer connected at its input to the second output terminal, and a comparison circuit including a first switching portion connected between the first and second output terminals for connecting and disconnecting the first and second output terminals in response to a comparison clock signal. The comparison circuit is connected at its output to the first or second buffer. The input voltage and the reference voltage are compared when said switching portion changes from the connecting condition to the disconnecting condition in response to the comparison clock signal.

Analog to digital converter

A filter circuit comprises a plurality of sampling and holding circuits for sampling and holding analog input signal with a predetermined sampling period, a calculation circuit for multiplying each the analog input signal by a predetermined multiplier, and for summing the multiplication results. The sampling and holding circuits are controlled in an electrical power such that the electrical power is decreased when holding.

Filter circuit

A signal reception apparatus in the spread spectrum communication system requires only a small amount of circuitry and consumes a small amount of electric power. A quadrature detector decomposes received signals into in-phase components and quadrature components, and supplies them to a complex-type matched filter. The complex-type matched filter de-spreads the in-phase components and the quadrature components and sends them to a multi-path selector. The multi-path selector selects, from among the received de-spread signals, multiple paths having high levels of signal electric powers and sends the received signals of the selected paths to multiple phase correction blocks. Analog operation circuits calculate phase errors of the received signals of two successive pilot symbol blocks for each path. An analog operation circuit corrects the phases of the received signals of the information symbol block that has been received between the two successive pilot symbol blocks. A rake combiner synchronously combines the phase-corrected de-spread received signals of each path.

Receiver in a spread spectrum communication system having low power analog multipliers and adders

A highly accurate vector absolute-value calculation circuit uses analog processing and minimal hardware. Signal voltages corresponding to an I component (real number part) and a Q component (imaginary number part) are input to a first absolute-value calculation circuit 13 and a second absolute-value calculation circuit 14 through terminals 11 and 12, respectively, and they are each converted into absolute-value signals. The component I absolute-value and component Q absolute-value are compared in a comparison circuit 20. According to the result, the larger absolute-value signals are output to an input capacitor 23 of a neural computation circuit, and the smaller absolute-value signals are output to an input capacitor 24 by controlling multiplexers 21 and 22. The capacity ratio of a feedback capacitor 26 of a neural computation circuit and input capacitors 23 and 24 is 11:10:5. The complex number absolute-value calculated by the following formula is output from an output terminal 27. ##EQU1##

Vector absolute--value calculation circuit

The present invention provides a matched filter which can refresh an entire while keeping the speed of a calculation comparable to a small sized circuit. The first and second addition circuits of a matched filter of the present invention are classified into a plurality of groups, the first and second auxiliary adders replace functions for the groups of the first and second adders respectively. The outputs of the first and second adders are then inputted to the first and second subtractors, respectively, and the refreshing means appropriately refreshes the groups replaced by the first and second auxiliary adders. Further, the present invention decreases the number of auxiliary sapling and holding circuits to be used, and decides the refreshing intervals by considering the change of the voltage caused by leakage and other permissible errors of output voltage.

Growing community of inventors

Tokyo, Japan

Kunihiko Suzuki