| Patent Number |
Title Of Patent |
Date Issued |
| RE30949 |
Digital frequency display device |
May 25, 1982 |
| A digital frequency display device for digitally displaying the operating frequency of a communication apparatus comprising a reference frequency oscillator, a first frequency mixer for mixing the output frequencies of a first oscillator of the communication apparatus and of the referenc |
| RE30839 |
Monostable multivibrator |
December 29, 1981 |
| A monostable multivibrator including a gate circuit, a time constant circuit, and an inverter circuit. An input signal to the gate circuit causes the time constant circuit which preferably includes a resistor and a capacitor to charge or discharge. A signal derived from the time cons |
| RE30781 |
Logarithmic amplifier |
October 20, 1981 |
| A logarithmic amplifier comprising a common-emitter type transistor amplifier circuit with an emitter resistor and a collector load. A bias voltage is applied to the base of the transistor through a diode so that the overall input-output transfer characteristic of the amplifier exhibits |
| 4903031 |
Satellite receiver |
February 20, 1990 |
| A satellite receiver which can selectively inhibit the reception of radio wave of the improper program. This receiver comprises: a receiver unit; a reproducer unit to reproduce the signal received by the receiver unit; a control unit including (a) a first memory to store the designated |
| 4873684 |
Method and apparatus for multiplexing of input signals having differing frequencies and demultip |
October 10, 1989 |
| A time division multiplex transmission system for time division multiplexing a plurality of information signals having different sampling frequencies and transmitting the time division multiplexed signal by one transmission path. The system includes the steps of: rearranging the plur |
| 4862179 |
Satellite receiver |
August 29, 1989 |
| A satellite receiver which selects one of radio waves from a plurality of satellites and receives the selected radio wave. This receiver comprises; a satellite number designation switch; an antenna controller for allowing a parabola antenna to face the designated satellite in accordance |
| 4850030 |
Radio communication system for communicating between two stations upon automatic switching to an |
July 18, 1989 |
| In the radio communication system for performing a communication in the idle channel selected from a plurality of frequency channels, the originating call station transmits the station identification code to specify the distant station together with the idle channel data to be actual |
| 4845436 |
Frequency synthesizer suited for use in a time division multiplexing system |
July 4, 1989 |
| A frequency synthesizer includes a 1/N divider for generating an address clock signal the frequency of which is 1/N times the frequency of an input signal, a memory for storing samples in a unit sine and cosine wave which is read out in response to the address clock signal to produce a f |
| 4825436 |
Time division multiplexing system for N channels in a frame unit base |
April 25, 1989 |
| A time division multiplexed signal demultiplexing system for regenerating original signals from a time division multiplexed signal which is obtained by time-division multiplexing information signals of N channels with mutually different sampling or clock frequencies by means of a referen |
| 4772513 |
Method for forming a hard carbon thin film on article and applications thereof |
September 20, 1988 |
| A method of forming diamond-like carbon layer which is advantageously adaptable as a coating layer on acoustic diaphragms. In the method, carbon vaporized out of solid carbon source is deposited onto the surface of the diaphragm as the coating layer in the atomosphere of catalystic gas, |
| 4612511 |
FM demodulator including PLL and improved circuitry for eliminating distortion in the output the |
September 16, 1986 |
| An FM demodulator having a phase comparator, a low-pass filter and a VCO including a variable capacitance diode, an input signal being applied to the phase comparator and a demodulated output signal being taken from the low-pass filter. The FM demodulator further includes a compensating |
| 4577342 |
Distortion cancel circuit in FM stereo |
March 18, 1986 |
| There is disclosed a distortion cancel circuit in FM stereo receiver, which circuit synthesizes a canceling signal mainly including the distortion component by performing the arithmetic operation for an FM demodulation signal and adjusts the level of this synthesized canceling signal and |
| 4573019 |
Current mirror circuit |
February 25, 1986 |
| A current mirror circuit comprising:a reference current source; a diode fed with a reference current by the reference current source; a plurality of output transistors commonly biased in base-emitter by a voltage induced across the diode and having loads at respective collectors thereof; |
| 4564815 |
FM Demodulator PLL with compensation for nonlinear varactor characteristics |
January 14, 1986 |
| There is provided an improvement of an FM demodulator of the PLL system including a VCO, a phase comparator and a low-pass filter, whereby the distortion components of the FM demodulated signal to be caused due to nonlinearity of the frequency vs. control voltage characteristic of the |
| 4561113 |
Distortion canceller for FM receiver |
December 24, 1985 |
| In a distortion canceller to remove the distortion of a demodulated signal in an FM receiver, the n-th power of the demodulated FM signal is produced and then differentiated to derive an n-th order distortion signal. The derived n-th order distortion signal is adjusted in its amplitude l |
| 4550423 |
Stereo MPX circuit |
October 29, 1985 |
| A stereo multiplex circuit which can reduce a distortion of an FM demodulated signal to be generated due to nonlinearity of the frequency vs. amplitude/phase characteristics of a band-pass filter at an intermediate frequency amplifier stage of an FM receiver. This circuit includes a |
| 4535437 |
Pickup arm driving control system with repeat playback function |
August 13, 1985 |
| A pickup arm driving control system in record disc players with repeat playback function. The driving control system can drive the manipulation of a tone arm in such a manner that only an optionally selected portion is repeatedly reproduced. The system includes an encoder for producing a |
| 4475245 |
Transceiver |
October 2, 1984 |
| An improvement in a transceiver having first and second carrier frequency oscillators for demodulation, a change-over device for making change-over of oscillation outputs between the first and second carrier frequency oscillators, a mixer for mixing the oscillation outputs from the first |
| 4472688 |
Amplifier circuit |
September 18, 1984 |
| A voltage switching amplifier circuit has a comparator which, after comparing signal amplitude to a comparison voltage, switches on a high voltage or low voltage amplifier depending upon whether the comparison voltage is exceeded or not. After the predetermined comparison voltage is |
| 4451796 |
Volume control apparatus |
May 29, 1984 |
| A volume control apparatus for use in an acoustic apparatus with a sound signal source and an amplifier which is usable as an alarm or warning apparatus. The volume control apparatus is provided with a motor for operating a volume control variable resistor, a manually operatable pres |
| 4441085 |
Signal amplifying apparatus |
April 3, 1984 |
| In a signal amplifying apparatus which is provided with a amplifier, a feedback circuit having its input connected via a CR circuit to the output of the amplifier and its output connected to the input of the amplifier, a first terminal connected with the output of the amplifier for conne |
| 4433433 |
Sampling pulse forming circuit for FM stereo demodulator |
February 21, 1984 |
| A sampling pulse generator circuit for a stereo demodulator circuit of a sample and hold system is disclosed. The pulse generator circuit uses pilot signals of an FM stereo broadcast as an input and produces output sampling pulses, which are phase-synchronized to the stereo subcarrier bu |
| 4431970 |
Quadrature detector using a double balanced differential circuit and a constant current circuit |
February 14, 1984 |
| A quadrature detector comprising a double balanced differential circuit including a constant current circuit, and a phase shifter circuit. The constant current circuit comprises a plurality of transistors having their collectors connected together, their bases connected together and thei |
| 4425587 |
Videodisc playback apparatus |
January 10, 1984 |
| A videodisc playback system is disclosed which enables repeated reproduction of signals recorded on a videodisc. The system comprises the usual means to mount and rotate the videodisc to be played back and a shifting device that shifts the scanning position of a read-out device in a |
| 4414584 |
High-speed playback for videodiscs |
November 8, 1983 |
| As many as four kinds of high-speed playback of a videodisc can be selected with only two operating switches. This is accomplished by extracting the vertical synchronizing signal from the composite video signal read from the videodisc and, based on this vertical synchronizing signal, pro |
| 4413703 |
Bass-reflex type speaker system |
November 8, 1983 |
| A bass-reflex type speaker system having a cabinet including a front baffle board, a back panel and two side panels and a speaker mounted on the front panel. A port is disposed in either the back panel or in one of the side panels and a duct is in communication with the port. The back pa |
| 4399475 |
Tape recorder |
August 16, 1983 |
| A tape drive mechanism for a tape recorder is provided with a motor-driven drive gear. The tape drive mechanism includes first and second switch gears engageable with the drive gear for respectively switching the tape drive mechanism into a first and second mode of operation. First and |
| 4393274 |
AM Stereo receiver |
July 12, 1983 |
| An AM stereo receiver for receiving AM stereo broadcasting of an AM-PM or AM-FM system. Between an IF AM signal amplifier and an limiter is interposed a 5 or more frequency multiplier so that the frequency of a spurious signal radiated from the limiter may lie outside of the frequency |
| 4390801 |
Circuit for reproducing a clock signal |
June 28, 1983 |
| A circuit for reproducing a clock signal from digital signals reproduced from a recording medium makes self-clocking possible. The circuit includes a phase lock loop having a voltage-controlled oscillator that generates an oscillation output at a frequency which is approximately equal to |
| 4388496 |
FM/AM Stereo receiver |
June 14, 1983 |
| An FM/AM stereo receiver for receiving an RF FM stereo signal by FM stereo broadcasting and an RF AM stereo signal of AM-PM or AM-FM system by AM stereo broadcasting. One limiter is used both as a limiter for limiting an IF FM stereo signal in an FM stereo receiving system and as a limit |
| 4386235 |
FM Stereo demodulator circuit |
May 31, 1983 |
| An FM stereo demodulator comprising a switching signal generator for providing four asymmetrical square wave switching signals whose phase differences from the subcarrier of the FM stereo composite signal are respectively 0.degree., 90.degree., 180.degree., and 270.degree. and whose |
| 4373209 |
Method and circuitry for controlling the intermediate frequency of an FM receiver to lessen phas |
February 8, 1983 |
| Circuitry for controlling the intermediate frequency of an FM receiver comprising modulating means for frequency modulating the intermediate frequency signal with a modulating signal of predetermined frequency; detecting means for detecting the absolute amount of distortion incurred |
| 4350957 |
Pulse counter-type FM detector |
September 21, 1982 |
| In a pulse counter-type FM detector circuit for obtaining audio signals at an output terminal by detecting FM signals in the following order through a limiter circuit, a trigger pulse generating circuit, a monostable circuit and an integrator connected to the output terminal where the |
| 4342966 |
Power amplifier circuitry |
August 3, 1982 |
| In a single-ended push-pull power amplifier circuit having a first transistor of a first driver stage, a second transistor of a first output stage where the first and second transistors are Darlington connected, a third transistor of a second driver stage and a fourth transistor of a |
| 4336534 |
Control generator for use in broadcast receiver including improved signal level indicator |
June 22, 1982 |
| A control signal generator for use with a broadcast receiver having a signal level indicator including a plurality of sequentially actuated luminous elements. The received signal strength is indicated by the number of luminous elements which are lit. The control signal generator is r |
| 4334197 |
Power amplifier circuitry |
June 8, 1982 |
| A single-ended, push-pull, power amplifier circuit where switching distortion due to transistors and diodes is lessened. |
| 4331930 |
Bias circuit for power amplifier |
May 25, 1982 |
| A bias circuit for single-ended push-pull amplifiers permits class A or class AB operation while substantially reducing the idling current of the output transistors at low input signal levels. The bias circuit includes a DC current limiting circuit comprised of transistors that are conne |
| 4325131 |
Tone arm bearing system |
April 13, 1982 |
| In a bearing system for a tone arm for use with a phonograph record player or the like where the bearing system includes a bracket for supporting the tone arm, a rotatable, tubular shaft connected to the bracket for permitting horizontal rotation of the tone arm, and a support for bearin |
| 4309649 |
Phase synchronizer |
January 5, 1982 |
| A phase synchronizer for obtaining a signal which is phase synchronized with respect to another signal which has passed through a transmission system after originating at a signal source, the phase synchronizer comprising a variable phase shifter responsive to the output signal of the |
| 4297601 |
Monostable multivibrator circuit and FM detector circuit employing predetermined load resistance |
October 27, 1981 |
| A monostable multivibrator circuit is disclosed. It is characterized by comprising a time constant circuit which includes a capacitor, an amplifier circuit which receives an output signal of the time constant circuit and in which a signal amplifying transistor operates in the non-sat |
| 4292549 |
Monostable multivibrator and FM detector circuit employing differential transistor pair (thresho |
September 29, 1981 |
| A monostable multivibrator circuit including a time constant circuit which includes a capacitor, an amplifier circuit which receives an output signal of the time constant circuit, and a positive feedback circuit which is connected between an output end of the amplifier circuit and an inp |
| 4288755 |
Protective circuit for a direct-coupled amplifier |
September 8, 1981 |
| A low pass filter is connected to a junction of a direct-coupled amplifier. The amplifier has a single-ended push-pull output stage consisting of two output transistors and series-connected two resistors. The output transistors are connected to a positive and negative d-c power sources, |
| 4288752 |
Stereo demodulator with high frequency de-emphasis compensation |
September 8, 1981 |
| The tendency for a sample-and-hold stereo multiplex demodulator having sampling pulses with low duty ratios to deemphasize the high frequency characteristics of the demodulated right and left signals is compensated for by connecting a pair of amplifiers to the right and left outputs and |
| 4282448 |
Monostable multivibrator and FM detector circuit employing common emitter transistor amplifier w |
August 4, 1981 |
| This invention discloses a monostable multivibrator which is useful for an FM detector circuit of a pulse count system. The monostable multivibrator has a time constant circuit which includes a capacitor, an amplifier circuit which receives an output of the time constant circuit, a posit |
| 4277703 |
Monostable multivibrator circuit with clamped non-saturating common emitter amplifier in feedbac |
July 7, 1981 |
| This invention relates to a monostable multivibrator which is operated in the non-saturated state. The monostable multivibrator circuit includes a time constant circuit which has a capacitor, an amplifier circuit which receives an output signal of the time constant circuit, a positive |
| 4268762 |
Pulse forming circuit |
May 19, 1981 |
| A trigger pulse forming circuit for converting a pulse signal into a trigger signal waveform is disclosed. It is characterized in that a time constant circuit is comprised in a collector output circuit of one of a pair of transistors for differential amplification and that a clamp ci |
| 4267605 |
Interference eliminator in communication receiver |
May 12, 1981 |
| In a communication receiver, a first mixing circuit, a first band-pass filter responsive to the output of the first mixing circuit, a second mixing circuit responsive to the output of the first band-pass filter, a second band-pass filter with a different center frequency from that of the |
| 4262260 |
Tone control circuitry |
April 14, 1981 |
| A tone control circuit including an operational amplifier having (a) an input circuit or output circuit and (b) a feedback circuit where circuits (a) and (b) are symmetrically disposed with respect to a reference potential such as ground. Circuitry is also provided to compensate for |
| 4259644 |
Local oscillator for multi-band reception having single crystal reference oscillator |
March 31, 1981 |
| A local oscillator having a variable frequency oscillator and a carrier frequency oscillator for use in communication systems that transmit and/or receive signals on multiple frequency bands, one crystal reference oscillator; a converter circuit for mixing the outputs of at least the |
| 4254346 |
Monostable multivibrator |
March 3, 1981 |
| In a monostable multivibrator including a gate circuit having first and second inputs, a differentiating circuit responsive to the output of the gate circuit and a voltage comparison circuit responsive to the output of the differentiating circuit where the gate circuit is adapted to have |
