Abstract: A device and method are disclosed, whereby the normally complicated and difficult frequency determination is achieved by simply arranged and executed measures, namely by means of larger, smaller and/or equal comparisons and a counting of certain events. The invention further relates to arrangements whereby the noise signal level, or the influence thereof on the verification to be carried out is reduced.

Abstract: An apparatus and method of system selection. A synchronization channel is received. A synchronization channel message received on the synchronization channel is decoded. An acquisition assistance channel is received. An advanced services information message received on the acquisition assistance channel is decoded. A system is selected based on the advanced services information message.

Abstract: A circuit arrangement for detecting a usable frequency channel includes first and second devices for performing frequency conversion. The first and second frequency conversion devices have respective local oscillator inputs to which respective local oscillator signals are applied. The local oscillator signals are at a common frequency and have a phase difference of precisely 90°. A complex polyphase filter has first and second filter inputs connected to respective outputs of the first and second frequency conversion devices. A detection arrangement is connected to outputs of the complex polyphase filter in order to detect a signal level. A further arrangement can vary the phase angle of a signal output from at least one of the frequency conversion devices.

Abstract: An aspect of the present invention provides a receiving circuit that includes a mixer configured to receive a signal and a local signal to mix the signals, the mixer configured to convert the signals into an intermediate frequency signal, an IF filter configured to filter the intermediate frequency signal outputted from the mixer, an IF amplifier configured to amplify a band of the intermediate frequency signal outputted from the IF filter, and a demodulation circuit configured to receive a signal outputted from the IF amplifier to carry out demodulation, wherein a part of the demodulation circuit is disposed outside of the receiving circuit.

Abstract: A high sensitivity of a Super-Regenerative Radio Frequency Receiver and its method is provided in the embodiment of the present invention. By using a common-mode feedback circuit and by replacing the rectifier with a feedback integral-rectifier, the rectifier, the low-pass filter, and the slicer will not be saturated during operation so that the output of the slicer is correctly generated, and the sensitivity of the Super-Regenerative Radio Frequency Receiver is greatly improved as a result.

Abstract: A resonant tunneling diode or diode array oscillator (10) including a resonant diode (11) is coupled to a millimeter-wave source (14) and a quench generator (16) for periodically quenching the oscillations so that the average oscillation time of the oscillator is proportional to signal strength of the source (14). The signal source can be from an antenna such as a dipole or tapered slot line antenna.

Abstract: A method of allocating a radio resource for a traffic burst is disclosed. The method includes the steps of selecting at least one cell having a pilot signal strength that is greater than a pilot signal strength of a primary cell, requesting a communication resource reservation to the selected cells, receiving results of reservation performed according to the reservation request from the selected cells, and requesting allocation of the communication resource to the cells that secure a maximum data rate by analyzing the results of reservation.

Abstract: The present disclosure provides a method and apparatus for communicating a base band signal via a communication channel that connects a transmitter to a receiver comprising the steps of modulating the base band signal into a low frequency deviation modulated signal, transmitting the low frequency deviation modulated signal with a transmitter, receiving the low frequency deviation modulated signal with a receiver, mixing the received signal to an intermediate frequency signal, multiplying the intermediate frequency signal by to a multiplied frequency signal, multiplying a reference signal having a frequency generally equal to the center frequency of the intermediate frequency signal by a multiple that is one greater than or one less than the multiplied frequency signal to create a reference multiplied frequency signal, subtracting the reference multiplied frequency signal from the multiplied frequency signal to generate a wide band frequency signal, and discriminating the wide band frequency signal to obtain t

Abstract: A superregenerative oscillator RF receiver having a differential output that has the advantage of providing an improved operating range and increased receiver sensitivity without affecting receiver cost or current requirements. The present invention comprises a receiver that has a super-regenerative oscillator from which the demodulated output is taken in differential form. This is achieved by generating collector and emitter output signals, low pass filtering both signals, and then combining them in a difference amplifier. The resulting waveform contains approximately twice the signal content than would be yielded from a singled-ended circuit. The preferred embodiment of present invention can also achieve quench noise cancellation with proper layout and the use of a common mode low pass filter followed by a difference amplifier.

Abstract: An RF controlled thermostat/controller is disclosed for an HVAC system having a superregenerative RF receiver which uses the temperature sensor of the thermostat for temperature stabilization of the superregenerative RF receiver. The superregenerative RF receiver provides a very low power drain always-on receiver for RF remote control of the thermostat/controller. The thermostat/controller includes a microcontroller with a non-volatile memory. A digital value stored in the non-volatile memory, or a non-volatile memory of a separate component, is used in one of several different embodiments to accurately tune the superregenerative RF receiver.

Abstract: A controlling apparatus of a mobile communication terminal using electrostatic detection includes an electrostatic detector for sensing an instantaneous voltage generated at higher than a reference level and applying it to a controller in order to recognize occurrence of a malfunction due to static electricity. Static electricity generated while a mobile terminal is in use is sensed by the controller to remove a no-sensing phenomenon of the display unit. Thus, a reliability of the mobile terminal can be enhanced and the user's convenience can be increased.

Abstract: A security system to enable authenticated access of an individual to a protected area, including a remote control unit (22) with a transponder (28), carried by the individual, which transmits an identification code group on reception of an interrogation signal. A control unit located within the protected area transmits an interrogation signal when activated by the individual, and verifies the identification code group received from the transponder. Access to the protected area will only be permitted on positive verification of the right to access. The transponder (28), contained within the remote control unit (22), is a passive transponder which obtains a supply voltage from the interrogation signal transmitted by the control unit (16) and then feeds this to a supply voltage rail.

Abstract: An amplifier for high gain, narrowband signal amplification is disclosed. An embodiment is an amplifier including a first means capable of oscillating and a second means for controlling the operating state of the first means between oscillation and close to oscillation. By operating close to oscillator high gain, narrowband signal amplification occurs. By operating between oscillation and close to oscillation, rather than between startup and close to oscillation, the amplifier is always narrowband. Accordingly, an advantage of the invention is operation with minimum affect from interfering.

Abstract: Techniques for selectively combining multiple transmissions to recover a message comprised of multiple frames. Initially, each transmission is separately processed to recover the message. If the message cannot be recovered error-free from any single transmission, then portions of multiple transmissions are selectively combined to recover the message. Erased frames in a message recovered from a primary transmission (e.g., the one with the best pilot Ec/I0) and good frames from other transmissions are determined (e.g., based on the frame-level CRC). One or more combined messages are then formed, each including a different set of good frames substituting for the erased frames. If a good frame cannot be derived from any single transmission for a given erased frame, then symbols from multiple transmissions may be combined to derive the good frame. Each combined message is checked (e.g., based on the message-level CRC) to determine whether it is good or erased.

Abstract: A variable band-pass filter unit which is free from deterioration in throughput or incapability of communication even if jamming signals are inputted.

Abstract: A hand-off control method is disclosed that can reduce the rate of occurrence of forced disconnection of communication. The intensity of signals received from a base station is periodically measured in a mobile station, the amount of relative change in received signal intensity is calculated for every measurement interval, and the measurement results and calculation results are notified to the base station and the base station of the hand-off destination. If the mobile station requests hand-off, the call of the mobile station is allocated in the hand-off destination base station to an appropriate queue among a plurality of queues that are given an order of priority, based on the amount of relative change for the call. The call is reallocated to a queue that corresponds to the new amount of relative change whenever the amount of relative change is updated. In addition, the waiting rank of the call within the queue is determined based on the received signal intensity at the mobile station.

Abstract: A superregenerative oscillator RF receiver is disclosed that has a differential output that has the advantage of providing an improved operating range and increased receiver sensitivity without affecting receiver cost or current requirements. The present invention comprises a receiver that has a super-regenerative oscillator from which the demodulated output is taken in differential form. This is achieved by generating collector and emitter output signals, low pass filtering both signals, and then combining them in a difference amplifier. The resulting waveform contains approximately twice the signal content than would be yielded from a singled-ended circuit. The preferred embodiment of present invention can also achieve quench noise cancellation with proper layout and the use of a common mode low pass filter followed by a difference amplifier.

Abstract: A superregenerative circuit which is operable in a transmit mode and a receive mode of operation. A superregenerative oscillator and a single antenna are functional in both modes. To minimize any undesired RF energy which may be radiated during the receive mode of operation, the circuitry includes decoupling means connected between the antenna and the oscillator. During reception, the oscillator is periodically quenched, and received signals are recovered by circuitry which obtains, during unquenched periods, time samples indicative of the time required for the RF energy to build up to a predetermined level in the oscillator circuit.

Abstract: The present invention relates to a method of supporting proper hand-off of a dual-mode mobile terminal based on terminal capability and communication status to guarantee continuous mobility in a mixed communication network where a synchronous and an asynchronous network system coexist. According to the present invention, a dual-mode terminal transmits information of its terminal capability operable in both the synchronous and the asynchronous network system to the mixed communication network, irrespective of which network system a present service area belongs to, then the mixed communication network constructs information on adjacent cells, which are selectively included based on the received terminal capability information, of the other network system and provides the dual-mode terminal with the constructed adjacent cell information.

Abstract: A signal receiver includes a superregenerative circuit for feeding back a part of an output signal to form part of an input signal through a feedback route to execute a superregeneration, a capacitance element disposed in the feedback route of the superregenerative circuit, a switch for switching the capacitance element, and a PLL circuit for generating a clock signal for switching the switch based on an output of the superregenerative circuit.

Abstract: In a frequency discriminator for a direct conversion receiver having a simple construction, in which operations for FM demodulation by direct conversion are simplified, two-signal components I and Q, which are inphase and quadrature, respectively, in a base band, obtained by direct conversion of an FM signal by means of a local oscillator, a 90.degree. phase shifter, multipliers, LPF and AMP are amplified to a predetermined amplitude and thereafter converted into digital signals by means of A/D converters. These digital signals are given to differentiators to obtain differentials (finite differences) thereof. These values are squared by means of squarers and squares thus obtained are added by means of an adder. An output of the adder is applied to a device for extracting square root to obtain a demodulation output of the FM signal. An ROM may be used in lieu of the squares and the device for extracting square root.

Abstract: A radio receiver with isolation between an antenna and a regenerative oscillator/detector. The isolation is provided by periodically (at the receiver's quench frequency) uncoupling the antenna from the regenerative oscillator/detector. The receiver preferably includes an antenna, a super-regenerative oscillator/detector, a clock that indicates the quench frequency, a timing circuit coupled to the clock, and a switch coupled to the antenna, to the oscillator/detector, and to the timing circuit. The timing circuit specifies a first part and a second part of each clock period. During the first part of each clock period, the switch at least partially couples the antenna to the oscillator/detector on the nominal reception frequency. During the second part of each clock period, the switch at least partially uncouples these two elements on the nominal reception frequency.

Abstract: In accordance with the present invention, a receiver of the type receiving both a signal subjected to FM (Frequency Modulation) and a signal subjected to orthogonal modulation is capable dealing with the two different kinds of signal by use of a single demodulator. This successfully scales down the circuitry of the receiver.

Abstract: A process for allowing two or more receivers to share the same nominal frequency or close nominal frequencies, preferably without these receivers blinding one another or disturbing one another is described. The process preferably includes subjecting a radiator to temporally spaced phases of operation or maximum radiation and temporally segregating the phase sensitivity of the oscillator/detector of the receivers with respect to the phase operation or the radiation of the receiver. The receiver during the phase of sensitivity of its oscillator/detector may not detect the electromagnetic radiation from the radiator.

Abstract: A wireless audible indication system comprising a transmitter and a receiver. An embodiment of the transmitter includes a crystal oscillator which produces a signal having a predetermined audio frequency. A duty cycle limiting circuit limits the duty cycle of the oscillator signal to be less than 25%. The limited duty cycle signal is applied to a radio frequency oscillator to produce an amplitude modulated radio frequency signal. An embodiment of the receiver includes a superregenerative detector which provides wide band detection of transmissions about a carrier frequency. A signal processing circuit formed by a cascade of a crystal filter stage, an amplifier/comparator stage, and a detector stage, processes the signal from the superregenerative detector. A sound generator integrated circuit, which generates an audible signal indicative of reception of a transmitted signal, is coupled to the signal processing circuit.

Abstract: A low-power, self-quenching superregenerative receiver utilizes a single-port SAW device coupled to an RF oscillator to establish the frequency of oscillation at the output of the RF oscillator. A diode detector is coupled from the oscillator output for detecting a predetermined amplitude of the oscillation output signal. A time-constant circuit is coupled from the signal detector for generating an oscillator quench signal when the oscillator signal is detected and the oscillator quench signal has a predetermined duration set by the time-constant circuit. A feedback circuit couples the oscillator quench signal to the RF oscillator to cause the RF oscillator to switch to a non-oscillating condition only during the predetermined duration of the RF oscillator quench signal. The RF oscillator then switches to the oscillating condition and the system repeats itself.

Abstract: A door operator includes a low noise, low radiation emission but high sensitivity super-regenerative receiver. The low radiation emission of the receiver allows the installation of plural operators in close proximity. The door operator receiver includes a super-regenerative circuit apparatus with a super-regenerative circuit and a resistively loaded cascode preamplifier stage that phase shifts a received RF signal and tightly couples the preamplifier stage output to the super-regenerative circuit. A cascode circuit arrangement of a field effect transistor (FET) and a bipolar transistor provides forward gain and very high reverse direction gain or isolation for the preamplifier stage. Preferably, the resistive loading elements and the phase-shifting elements are coupled to the cascode circuit between the transistors. The present invention also relates to a cascode preamplifier stage, a super-regenerative circuit, and a RF receiver each including such a preamplifier stage.

Abstract: Control systems including control circuitry and optional communications systems for operating a sliding power-operated member of an automotive vehicle. A powered sliding door in an automotive vehicle, such as a van, moves along a predetermined path of travel between a closed position and a fully open position relative to the body of the vehicle. Such a sliding door may be provided with one or more electrically-operated actuators for performing functions associated with the door, such as power opening and closing the door, power unlatching the door, power locking and unlocking the door, and power clamping and unclamping the door in a soft or low-momentum manner. The invention is directed toward improved control systems and circuitry for operating such power-sliding door systems. One such control system employs a wireless communications link between the door and body, which is preferably implemented using radio frequency communication signals containing digitally encoded control signals.

Abstract: A micropower RF transdponder employs a novel adaptation of the superregenerative receiver wherein the quench oscillator is external to the regenerative transistor. The quench oscillator applies an exponentially decaying waveform rather than the usual sinewave to achieve high sensitivity at microampere current levels. Further improvements include circuit simplifications for antenna coupling, extraction of the detected signal, and a low-voltage bias configuration that allows operation with less than a 1-volt rail voltage. The inventive transponder is expected to operate as long as the battery shelf life.

Abstract: A reception electric field level detection circuit comprises a frequency conversion circuit, an IF filter and a demodulation circuit for outputting a demodulation signal, which are connected successively to an antenna. The reception electric field level detection circuit further comprises a reception electric field detection circuit for receiving the output of the IF filter as an input thereto and detecting the reception electric field level value of the received wave, and a discrimination circuit. A carrier sent out from a mobile radio unit to a stationary radio unit is received by the antenna and inputted to the demodulation circuit and the reception electric field detection circuit by way of the frequency conversion circuit and the IF filter.

Abstract: The current invention is a method (100), super-regenerative transceiver (300), and computer system (500) for providing short range communication with reduced current drain. A control unit provides an amplifier "ON" pulse periodically to a radio frequency amplifier to allow reduced current drain. The radio frequency amplifier eliminates antenna effects in an input signal to provide an amplified input signal. The control unit also provides a receiver "ON" pulse to a super-regenerative receiver immediately following the amplifier "ON" pulse to allow reduced current drain. The super-regenerative receiver detects received data given the amplified input signal.

Abstract: A wireless audible indication system comprising a transmitter and a receiver. An embodiment of the transmitter includes a crystal oscillator which produces a signal having a predetermined audio frequency. A duty cycle limiting circuit limits the duty cycle of the oscillator signal to be less than 25%. The limited duty cycle signal is applied to a radio frequency oscillator to produce an amplitude modulated radio frequency signal. An embodiment of the receiver includes a superregenerative detector which provides wide band detection of transmissions about a carrier frequency. A signal processing circuit formed by a cascade of a crystal filter stage, an amplifier/comparator stage, and a detector stage, processes the signal from the superregenerative detector. A sound generator integrated circuit, which generates an audible signal indicative of reception of a transmitted signal, is coupled to the signal processing circuit.

Abstract: A pneumatic tire monitoring system is disclosed which provides a pressure sensor/transponder unit for each pneumatic tire of a vehicle to monitor tire pressure. A coded signal transmitted from each transponder unit is received by a multi-purpose receiver which may provide information to the vehicle operator or to other vehicle systems and subsystems. Each transponder unit is characterized by ultra low power consumption to extend the useful battery life. The transponder units may be mounted within the vehicle tires, or externally mounted. Impedance matching circuitry allows the use of the wheel rims with the transmitting antenna so as to avoid doppler shift induced by the rotating antenna and frequency drift induced by capacitive coupling.

Abstract: An electrically tuned super-regenerative receiver (10) comprises a feedback type oscillator having a signal output and a signal input, phase shift components (30) connected in a feedback loop for coupling the signal output to the signal input to cause oscillations, and a quench oscillator (35) coupled to the signal input for switching the oscillator between an oscillating and a non-oscillating condition. A variable capacitance device (40), such as a varactor diode, is connected between the signal output and a reference potential (21), and a microprocessor (105) provides a tuning voltage (42) which is applied at the signal output for varying the current in the varactor diode, thereby varying the oscillator center operating frequency. The oscillator center operating frequency is detected by a spectrum analyzer (112) and compared to a desired center operating frequency by a controller (118).

Abstract: An output processing circuit comprises a level detector for detecting a level of a signal corresponding to an intensity of a reception electric field, a gradient controller for controlling a gradient of a signal level detected by the level detector so as to correspond to the intensity of the electric field, a potential slider including a level shifter having a variable shift amount for shifting the level detected by the level detector by a predetermined amount, and an output control circuit for processing a reception signal in accordance with an output level from the potential slider. The output processing circuit includes a level shifter having a variable level shift amount for shifting the level of the signal detected by the level detector by a predetermined amount. The operation range of the output control circuit is continuously changed.

Abstract: A superregenerative receiver includes a quenching oscillator for converting a received signal into a low frequency signal. The quenching oscillator comprises a transistor, a positive feedback circuit and an RC time constant circuit. A circuit is provided for modifying oscillation conditions including the base voltage of the transistor, a power supply voltage and the RC time constant of the RC circuit. In response to the output of the quenching oscillator whose oscillation condition or conditions have been modified, the quenching oscillator is placed into its optimum operating state in order that the receiver assumes substantially the maximum sensitivity.