Abstract: A system for improving the level of service to the user, and billing according to user intentions while making effective use of telephone lines. The system includes a host computer (3) that controls communication services provided by telecommunications carriers, a base terminal (1) having base ID information which the host computer can identify, and a plurality of remote terminals (2A-2n.) having remote terminal ID information which the host computer can identify, to which control is transferred from the base terminal, and which communicate with the host computer.

Abstract: The present invention relates to a slave communication device which received control delegation from a master communication device and performs communication with an originating telephone apparatus through a host station based on a call originated from that originating telephone apparatus, and has a master communication device 1 having a unique master ID set therefor for using a wireless telephone line provided by a host station 3 and one or more slave communication devices 2 receiving control delegation from the master communication device 1 to perform communication using the wireless telephone line for the master communication device 1.

Abstract: A matched filter bank including a plurality of matched filters and a sampling and holding units commonly used by the total matched filters. Therefore, the circuit size is diminished. An inverting amplifier for the matched filter with a variable gain includes an input capacitance, an inverting amplifier connected to an output of the input capacitance, and a plurality of feedback capacitances connected between an input and output of the inverting amplifier. A plurality of switches are connected to input side of the feedback capacitances for alternatively connecting the feedback capcitanec to the input of the inverting amplifier or a reference voltage. The feedback capacitances connected to the reference voltage are invalid with respect to a composite capacitance of the feedback capacitance and have no influence to the amplifier.

Abstract: Within a building, wireless communications can be carried out by using signals at millimeter wavelengths. The building is, for instance, arranged by employing: a first antenna mounted on the side of one surface of a door or a wall, for sensing a signal having a millimeter wavelength; a second antenna mounted on the side of the other surface of the door or the wall, for radiating a signal having a millimeter wavelength; a first receiver for receiving the millimeter-wave signal sensed by the first antenna, and for converting the received millimeter-wave signal into an electric signal; and a first transmitter for converting the electric signal which is received and converted by the first receiver into the millimeter-wave signal and for transmitting the converted millimeter-wave signal via the second antenna.

Abstract: Within a building, wireless communications can be carried out by using signals at millimeter wavelengths. The building is, for instance, arranged by employing: a first antenna mounted on the side of one surface of a door or a wall, for sensing a signal having a millimeter wavelength; a second antenna mounted on the side of the other surface of the door or the wall, for radiating a signal having a millimeter wavelength; a first receiver for receiving the millimeter-wave signal sensed by the first antenna, and for converting the received millimeter-wave signal into an electric signal; and a first transmitter for converting the electric signal which is received and converted by the first receiver into the millimeter-wave signal and for transmitting the converted millimeter-wave signal via the second antenna.

Abstract: A matched filter and signal reception apparatus having a low power consumption and small circuitry size. In the matched filter, an analog input signal is converted to digital data by an analog to digital (A/D) converter, digital multiplication, as a correlation calculation, is executed by a plurality of exclusive-OR circuits, and an addition of outputs of the exclusive-OR circuits is performed. In the digital multiplication, the digital data is multiplied by a spreading code of one bit. The outputs from the exclusive-OR circuits are added for each weight of bits, and the addition output results are weighted and summed together.

Abstract: 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.

Abstract: 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.

Abstract: There is provided a tag IC that radio waves transmitted from the tag IC is intensified, so that information stored in the tag IC can be read even if the distance between the tag IC and a reader is increased. The tag IC comprises an antenna that receives/transmits signals from/to the reader with AC electromagnetic energy, an IC chip that decodes received data from the reader, calculates transmitting data based on stored data, and transmits data, and a solar cell that directly converts optical energy to electrical energy to supply power to the IC chip.

Abstract: An A/D converter having a plurality of thresholding circuits corresponding to bits of output digital data, each of which includes odd number of inverters serially connected from a first stage to a last stage. The first stage inverter of the thresholding circuits have thresholds equal to a weights of the bits. The inverters of the last stage are of thresholds different from those of the first stage.

Abstract: The present invention provides a lock with an authenticated open and set function, by which the lock may be opened without any bothersome operation for inserting a key to open the lock. An IC card 3 sends user identification information stored in a memory 34 to an authenticated open and set function unit 1. The authenticated open and set function unit 1 sends the user identification information to a collator 15 under the control of a controller 11 on reception of it. The collator 15 collates the user identification information sent from the IC card 3 with that stored in a memory 16. When both of the user identification information are coincided with each other, the collator 15 sends the collation signal, which is indicative of the user being authenticated, to the controller 11. The controller 11 gives a controller 17 a command to open a lock installed in a door 2. The controller 17 opens the lock based on the command by the controller 11.

Abstract: A compact and easily-assembled circuit for a complex despreading system, arranged such that the circuit does not contain pairs of adders at the output area. The configuration of the circuit enables the addition and subtraction of different signal components to occur before the multiplication stage and not at a pair of adders located at the output area The complex despreader system employs a complex matched filter at a receiver for despreading received signals with a QPSK system in the primary modulation and a BPSK system in the secondary modulation modulated at a transmitter. The input area of each matched filter of I and Q channels includes a pair of adders. One adder generates a first signal having a positive in-phase and a positive quadrature component. The other adder generates a second signal having a negative in-phase component and a positive quadrature component.

Abstract: The present invention provides a path-diversity system featuring a small-size phase compensating circuit. This circuit calculates a compensating coefficient according to the signals of a pilot block or a pair of pilot blocks surrounding an information block, and then compensates information signals thereafter by the calculated compensating coefficient.

Abstract: The present invention has an object to provide a spread spectrum communication system for heightening the speed of communication. The present invention transfers the first PN code sequence itself as the first component, adds and transfers zero or more instances of the second PN code sequence given a phase difference as the second component, and defines an information for transmitting by the number of the second PN codes corresponding to a cycle of said first PN code sequence.

Abstract: In one aspect, the present invention provides a low power consumption matched filter. The signal received at an input terminal is input to a shift register having stages equal to the spread code length number after conversion into digital signals in an A/D converter. The outputs of the shift register stages are input to XOR circuits set corresponding to each stage, so that XOR operations are performed between the outputs and corresponding spread code bits d1 to dN. The outputs of the XOR circuits are analogously added in an analog adder and output from an output terminal. In another aspect, a filter circuit uses an analog operation circuit to prevent lowered operational accuracy caused by residual charge. Input analog signals successively undergo sampling and holding in sample-and-hold circuits, are multiplied by coefficients stored in a shift register by multiplication circuits, and added in an addition circuit.

Abstract: A complex multiplication circuit of a calculation formula equivalent but different from the usual formula.The calculation formula is as follows:Pr={x(a+b)-b(x+y)} equivalent to (ax-by)Pi={y(a-b)+b(x+y)} equivalent to (ay+bx)Here,Input signal: x+jyMultiplier:a+jbMultiplication result:Pr+jPi.

Abstract: In a method is disclosed for transmitting and receiving a transmission data signal, after the transmission data signal is generated, it is modulated by a first time spread root Nyquist filter to generate a transmission signal. The signal is then transmitted and received, whereupon the signal is transformed into a baseband signal. The baseband signal is then demodulated through a second time spread root Nyquist filter to revive the transmission data signal. An apparatus is also disclosed that performs this method. In addition, methods of separately transmitting and receiving signals are also described.

Abstract: A waiting circuit which is utilized in a mobile communication system. The waiting circuit detects a predetermined signal from a base station. The waiting circuit starts other circuits in the mobile communication system which are in a sleep mode when the predetermined signal is received. The predetermined signal is generated in the base station. The predetermined signal has a speed equal to a predetermined symbol rate and is modulated to be an intermediate frequency signal. The intermediate frequency signal is sampled in response to a sampling clock that has a speed equal to an integer times the symbol rate. The sampled intermediate frequency signal is input to a match filter which multiplies the sample signal by a predetermined sequence of coefficients.

Abstract: Phases of the spread spectrum signal are corrected with a high degree of accuracy by a minimum of circuitry. One of phase correction circuits 31-34 of the receiver corresponds to each path. The I-component and Q-component of a despread output are supplied to the phase correction circuits 31-34. A phase error extractor 1 extracts the first phase error from a received pilot block. A phase corrector 2 corrects the phase error of a received information symbol using a correction vector that has been calculated based on the first phase error. The RAKE synthesizer 25 synthesizes the corrected received signal with outputs of the phase correction A circuits of other paths and outputs the synthesized signal to a temporary determiner 3 which temporarily determines an information symbol to be processed. The phase error is modified in a correction vector modifier 4 using the temporary determination result. A new correction vector is calculated based on the modified phase error.

Abstract: A spread spectrum communication system wherein spreading codes for in-phase and quadrature components are composed by addition and subtraction and the received signal is multiplied by these composed codes for despreading. The communication system comprises a transmitter generating in-phase and quadrature components. The transmitter includes a spreading circuit for spreading the in-phase and quadrature components. The system further includes a receiver, a phase correction circuit for correcting the phase of despreaded components, a rake combiner for combining the components corrected by the phase correction circuit and a circuit for outputting a combined signal and a delay detection circuit for delaying detection of the combined signal. The receiver also comprises a provisional judgment portion for judging the phase of a pair of the in-phase and quadrature phase components. The phase correction circuit corrects the phase according to the phase judged by the provisional judgment portion.