Assignee: General Research of Electronics, Inc.

Location: Tokyo, JP
No. of patents: 76

Number	Title	Issue Date
7587182	Receiver input circuit A receiver input circuit comprises an R-∞ type low-pass filter, a small-capacitance type coupling capacitor element and a parallel tuning circuit. The low-pass filter has an inductor element and a first capacitor element both connected in series, and a shunt-conne...	09/08/2009
7088790	Circuit for detecting a center level of a FSK demodulated signal to correct same In demodulation of a FSK signal, a circuit for detecting a center level of said signal and correcting an error thereof is provided. Said circuit can accomplish the detection of the center level correctly always even if there exist cords with various lengths in a len...	08/08/2006
7005950	Negative impedance converter There is provided a negative impedance converter, which has negative impedance conversion function by widening the available range of a generalized impedance converter. A generalized impedance converter is composed of two operational amplifiers Q1 and Q	02/28/2006
6985053	Negative resistance circuit In order to provide a negative resistance circuit which is not influenced by means of change of temperature and source voltage, etc., operates stably and has simple circuit construction, a first stage circuit of the negative resistance circuit is a collector-emitter...	01/10/2006
6968165	Frequency scanning receiver permitting quick PPL setting A frequency scanning receiver minimizes the time needed for setting the frequency of a phased lock loop of a first local oscillator. The frequency scanning receiver is configured so that when the reference frequency of the PLL of the first local oscillator has been ...	11/22/2005
6954123	Tuning circuit Selectivity Q of a tuning circuit is maximized by using a negative resistance circuit that is not influenced significantly by changes in conditions such as temperature, source voltage, etc. The tuning circuit operates stably and is constituted by a series resonance ...	10/11/2005
6933775	Circuit for detecting and correcting central level of FSK demodulation signal A circuit for detecting and correcting a center level is constituted for when the length of a code of “1” or “0” in an FSK signal is extremely long and superimposed with a frequency fluctuation of a transmitter/receiver. This circuit has sample value holding...	08/23/2005
6870447	Tuning circuit A tuning circuit using a negative resistance circuit for compensating an equivalent series resistance component thereof is provided. The negative resistance circuit has simple circuit construction and design and adjustment thereof is easy. The tuning circuit compris...	03/22/2005
6836199	Tuning circuit In order to improve Q of a tuning circuit by using a negative resistance circuit, a tuning circuit wherein a frequency selectivity characteristic and a tuning circuit gain does not vary and are kept constant values even if a tuning frequency is changed, is provided....	12/28/2004
6816005	All pass filter An all pass filter capable of adjusting a center frequency and Q independently from one another, even in a high frequency band. In the filter, an input signal from an input terminal is applied to a gain control circuit and a subtraction circuit, and after a gain of ...	11/09/2004
6803812	Active filter A low pass notch filter has a notch frequency close to ωo. In the notch filter, an output of an operational amplifier is fed back to an inverting input terminal thereof through a second voltage dividing circuit and a charge/discharge resistor. A first vo...	10/12/2004
6690303	Character input method A character input method enables mistake of character input to be diminished, and it is unnecessary to use a rotary type switch in the character input method, therefore it is economical. In a frequency scanning type receiver, when it causes character inpu...	02/10/2004
6628181	Tuning circuit having a resonance circuit and a negative resistance circuit A tuning circuit is constructed to set Q of the tuning circuit to a high desired value by using a negative resistance value. The tuning circuit is made to oscillate weakly by using a negative resistance circuit, a voltage-resistance converter and a digital-ana...	09/30/2003
6570937	Frequency scanning FSK receiver A frequency scanning receiver for a FSK signal of such a type that a center frequency is provided in an overhead portion of a packet. The receiver is constructed so that a remaining center level error, when the FSK signal is found by frequency scanning of...	05/27/2003
6546060	Direct modulating FSK transmitter for MCA A direct modulating frequency shift keying transmitter for multi channel access is constructed so that a transmission signal from a voltage controlled oscillator (VCO) in a phase lock loop frequency synthesizer is output through a buffer amplifier and a t...	04/08/2003
6545570	Tuning circuit including a negative impedance circuit A tuning circuit has a simple circuit construction and is capable of setting Q thereof to a high desired value. The tuning circuit is formed by a resonance circuit consisting of an inductor and a capacitor and a negative resistance circuit connected in se...	04/08/2003
6535164	Each area automatic selection receiver for emergency radio signal An each area automatic selection receiver of an emergency radio signal is an emergency broadcast receiver which enables current area code CAC to be updated automatically. This receiver is constituted in such a way that a GPS receiver obtains current posit...	03/18/2003
6504458	Tuning circuit with controlled negative resistance In order to automatically set a Q value to an optimal value, a tuning circuit has a resonance circuit composed of an inductor and a capacitor. The resonance circuit includes a negative resistance circuit having a dummy load resistance and a negative imped...	01/07/2003
6480060	FSK signal demodulating integration-discharge circuit A FSK signal demodulating integration-discharge circuit has a simple circuit configuration and utilizes an AC waveform of the FSK signal as a. control signal for a transistor gate. FSK signals are converted into rectangular-wave signals by the use of a li...	11/12/2002
6456174	Tuning circuit A tuning circuit enables its Q to be always maintained with the condition of high grade even when tuning frequency of the tuning circuit is changed. The tuning circuit is constituted in such a way that a negative resistance circuit is connected to the tun...	09/24/2002
6396328	Variable capacitance circuit A variable capacitance circuit enables electrostatic capacity to be adjusted as a trimmer capacitor, and that enables a temperature characteristic to be set variably. An input voltage is made to lead by a phase angle of 90° due to a differentiating circu...	05/28/2002
6396882	Frequency scanning type receiver In a frequency scanning receiver for a packet FSK signal of such a type that a duration to issue a center frequency is provided in head portion thereof, the packet FSK signal is scanned by a scanning voltage from VFO in a frequency converter to provide an...	05/28/2002
6377020	Power supply unit A power supply unit which has charging function enables error charging of a non-charged-type battery to be prevented, which battery is used as a power supply of an electric circuit device. Such the power supply unit is materialized with simple constitutio...	04/23/2002
6373332	Biquad notch filter When using an operational amplifier having a small gain-band width product, in order to obtain a circuit having deep notch characteristics, a biquad filter includes first and second stages having inverse amplifiers and third and fourth stages having inver...	04/16/2002
6225861	Variable capacitance circuit In order to provide a variable capacitance circuit having very small voltage dependability, this circuit is constituted by two variable capacitance diodes. An input signal is applied to each of said diodes with backward polarity and a capacitance control ...	05/01/2001
6137846	AFC circuit for a frequency scanning FSK receiver An AFC circuit for a frequency scanning FSK receiver is so constructed that through put of data which can be transmitted is improved by shortening a header of a packet signal owing to the fact that frequency errors remaining when an object signal is caugh...	10/24/2000
6108387	AFC circuit for a frequency scanning receiver In a frequency scanning receiver having an AFC function, when a desired signal is caught by frequency scanning due to VCO, to which a scanning voltage from a scanning signal oscillator is applied, the scanning is stopped. At this time, an operating circui...	08/22/2000
6072997	Frequency discriminator for a direct conversion receiver 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 ba...	06/06/2000
6066970	Circuit for producing clock pulses from an inputted base band signal In order to reproduce a clock having little jitter in the clock reproduction in data transmission, a reproduced clock is outputted by sampling an inputted base band signal by using sampling pulses by means of a sampler and shaped by means of a flip-flop. ...	05/23/2000
6038268	Direct conversion FSK signal radio receiver In this disclosure, a single combination of a multiplier and amplifier is utilized in a time-sharing manner for two-axis, in-phase an orthogonal phase components (I-axis and Q-axis components, respectively) so that the problem of a phase error relating to...	03/14/2000
5999577	Clock reproducing circuit for packet FSK signal receiver A circuit is provided by which in the case of the transmission of a short packet signal through an FSK transmission channel having a frequency error for transmission and reception, directly from one shaped rectangular pulse of a frequency detected bit syn...	12/07/1999
5949829	Central error detecting circuit for FSK receiver A demodulated baseband signal of a bit synchronization signal which has been FSK modulated, because it was transmitted with a narrow frequency band, is usually in the form of a sine wave on which a DC drift is superposed. Since this DC offset will cause b...	09/07/1999
5937338	Scanning radio receiver A scanning radio receiver of triple conversion superheterodyne tuning, having a CPU and a keyboard. The CPU has a programmable memory to store frequencies received by the scanning radio receiver. A first and second frequency mixer for frequency converting...	08/10/1999
5875389	SSB radio receiver An SSB radio receiver having an inexpensive wide-band IF filter which passes through not only a reception objective SSB station IF signal but also an interference SSB station IF signal simultaneously. These signals are SSB-detected to reproduce the origin...	02/23/1999
5870669	Radio receiver A radio receiver which includes structure for direct-frequency-converting a received input signal to two axial base-band components including an in-phase base-band component and orthogonal phase base-band component. The radio receiver also includes struct...	02/09/1999
5864751	System for programming a radio receiver A novel apparatus is provided for facilitating the transfer of signals from a computer for the external setting of reception frequency parameters and other operating conditions of a radio receiver having a memory which is programmable according to data in...	01/26/1999
5794161	System for programming a scanning radio A system for externally setting reception frequency parameters of a radio scanner having a memory which is programmable according to data in the form of an electric pulse signal generated according to a protocol by a computer. The system includes a comput...	08/11/1998
5717721	Demodulation correcting circuit for FSK receiver A demodulation correcting circuit for an FSK signal receiver which include an AFC for correcting a reception frequency error to provide stabilized demodulation, said demodulation correcting circuit comprising subtracting circuit followed to a loop filter ...	02/10/1998
5661392	Device for causing electronic apparatus to use a selectively mounted non-rechargeable battery pack or rechargeable battery pack A device, which is adapted to be connected to an electronic apparatus, is capable of having a non-rechargeable battery pack or a rechargeable battery pack connected thereto. The battery packs supply a driving voltage to the electronic apparatus when conne...	08/26/1997
5644600	Multi-valued signal decoding circuit having bit synchronization signal timing transition which is sampled and held A multi-valued signal decoding circuit is disclosed which has a circuit for detecting a bit synchronization signal included in the multi-valued data signal transmitted in the form of a packet signal, a circuit for detecting by this detected output a timin...	07/01/1997

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Assignee: General Research of Electronics, Inc.