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3970937 |
Modem for a suppressed carrier communications system
A modem having a transmitter portion including a first modulator connected to receive audio frequency signals and supplying an output signal through a single sideband filter to a second modulator...
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3969675 |
Single side-band radio
A single side-band electrical information-transmission system is described in which the correct oscillator frequency for demodulation in the receiver is achieved by attenuating a narrow band of...
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3965421 |
Automatic master-slave carrier switching circuit
A suppressed carrier, communications system including at least two spaced apart transceivers wherein a portion of the carrier is transmitted for synchronizing both transmitters and receivers, the...
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3961288 |
Double sideband suppressed carrier modulator using surface wave device
An apparatus and method for generating a double sideband suppressed carrier signal utilizing a surface wave device. Three equally spaced surface wave transducers are formed on a surface wave...
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3956715 |
Amplitude modulation system
An amplitude modulation system suitable for use in television broadcasting is described including phase modulating means for phase modulating a carrier signal with an input signal to provide a...
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3952251 |
Narrow bandwidth, compatible single sideband (CSSB) transmission system, and three tone generator used therein
Compatible single sideband (CSSB) transmission system utilizing a three tone generator to develop the characteristic CSSB modulation of an electromagnetic energy carrier wave, i.e. a somewhat...
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3938061 |
Frequency summing device
Frequency summing device comprising a summing element effecting the summing of the output signals of a first multiplier receiving a signal whose frequency is f and a signal whose frequency is F and...
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3936593 |
Scrambler and decoder for a television signal
An improved scrambler and decoder for a television signal is described wherein a television carrier is inverted in phase and subjected to low frequency amplitude modulation to obtain enhanced...
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3906472 |
Vehicle safety and crime deterrent communication system
For use in a vehicle having radio equipment including at least a microphone and a transmitter, apparatus including a second microphone and an adapter for connecting both of said microphones to the...
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3902126 |
Single sideband generator
There is disclosed a single sideband generator that provides as its output a selected one of two sidebands and rejects the unselected sideband and the carrier. Two triangular waveforms each having...
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3895316 |
Complex tone modulation
The generation of signals which vary in both frequency and amplitude in accordance with the amplitude of an information bearing input signal is disclosed. The invention thus relates to a complex...
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3868599 |
SINGLE SIDEBAND FREQUENCY MODULATION SYSTEM
A single sideband frequency modulation system wherein an input signal is divided into high and low-frequency components. The high-frequency component is transmitted as single sideband frequency...
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3852519 |
VIDEO AND AUDIO ENCODING/DECODING SYSTEM EMPLOYING SUPPRESSED CARRIER MODULATION
In a television transmission system, particularly a community antenna television system (CATV), although also applicable to broadcast television transmission, a system is disclosed for encoding...
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3810021 |
INBAND GENERATION OF DIGITAL SIGNALING WAVEFORMS
Analog waveforms are directly and continuously generated in a desired transmission passband from baseband digital data signals without a separate frequency translation operation by exciting...
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3800131 |
HILBERT TRANSFORMER
The present inventive transformer is comprised of a first and second channel with the first channel transforming an input signal by a desired function and providing as an output the transformed...
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3778718 |
MODULATION SYSTEM
A system for modulating a wideband information signal, in which the information signal is separated into a multiplicity of frequency bands. The several frequency bands are used to modulate a...
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3775555 |
MODULATOR SYSTEM
A video playback system incorporates a modulator system to enable direct connection to a television receiver antenna terminals. The modulator system includes a tunable source of radio frequency...
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3757222 |
SINGLE SIDEBAND GENERATOR EMPLOYING A PLURALITY OF CYCLICALLY SWITCHED SHORTING DIODES CONTROLLING A TRANSMISSION LINE ELECTRICAL LENGTH
A digital single sideband generator in which the carrier frequency is fed via a circulator to a (microstrip) transmission line which has a series of switchable short circuits (RF grounded diodes)...
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3719903 |
DOUBLE SIDEBAND MODEM WITH EITHER SUPPRESSED OR TRANSMITTED CARRIER
An inexpensive, two-transistor modem wherein the first transistor is a high gain amplifier connected to receive the modulating signal, and the second transistor is connected as a shunt modulator...
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3714577 |
SINGLE SIDEBAND AM-FM MODULATION SYSTEM
A sub-carrier signal is amplitude modulated. This sub-carrier AM modulated signal is then used to frequency modulate a radio frequency carrier. The radio frequency is then multiplied. One sideband...
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3675162 |
MODULATOR FOR INSTRUMENT LANDING SYSTEM
A modulator for an instrument landing system includes a source of a radio frequency carrier wave and a first power divider coupling the carrier wave to a first hybrid combining circuit and through...
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3644831 |
MODULATION SYSTEM
A narrow band transmitter utilizing a modulation technique in which a variable frequency oscillator is constrained to follow the frequency variations of a heavily limited single sideband signal to...
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3617892 |
FREQUENCY MODULATION SYSTEM FOR SPREADING RADIATED POWER
A communications system for use in a frequency band having a restricted spectral power flux density uses a transmitter having a specified carrier frequency within the band. A linear sawtooth...
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3604947 |
VARIABLE FILTER DEVICE
The present invention relates to electrical circuit apparatus capable of providing sampled integration of an electric signal. According to the present invention, an integrator filter is provided...
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3585529 |
SINGLE-SIDEBAND MODULATOR
A single-sideband modulator is realized by supplying an input signal to be modulated to a plurality of circuit paths. At least one of said circuit paths comprises the serial connection of a first...
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3573660 |
BROADBAND, REFLECTION-TYPE SINGLE SIDEBAND MODULATORS
A distributed parameter, single path, phase differential reflection circuit utilizes two nonlinear diodes to generate a single sideband signal with broadband power levels.
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3569837 |
SYSTEM FOR SUPPRESSING ONE SIDEBAND IN AMPLITUDE-MODULATED TRANSMITTER
A system for suppressing one sideband in a radio transmitter having amplitude and phase modulation. The system comprises an integrator circuit receiving the signal to be transmitted from an...
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3568095 |
SELF-BALANCING MODULATOR FOR SUPPRESSION OF CARRIER WAVE
Two transistors of opposite conductivity types are connected back-to-back, with their emitters confronting each other, across a source of DC driving voltage for push-pull energization by a carrier...
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3560654 |
MODULATION AND DEMODULATION APPARATUS USING REFERENCE TIME FUNCTIONS
A single-sideband modulator and demodulator are realized by using reference time functions. The desired modulated or demodulated signals are generated by modulating and filtering a train of pulses...
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3537009 |
FREQUENCY COMPARATOR
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3514720 |
TRANSFORMERLESS BALANCED-TYPE AMPLITUDE OR PHASE MODULATOR-DEMODULATOR CIRCUIT
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3500250 |
CARRIER SUPPRESSION SYSTEM FOR SPECTRUM ANALYSIS
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3500228 |
MEANS FOR GENERATING A DOUBLE SIDEBAND SUPPRESSED CARRIER AM WAVE
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3495177 |
VOICE SIGNAL PROCESSING SYSTEM FOR MULTICHANNEL SSB TRANSMITTER
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3495188 |
SINGLE-SIDEBAND CARRIER FREQUENCY SYSTEM UTILIZING A PREMODULATION STAGE FOR PROVIDING THE BASE PRIMARY GROUP
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3492580 |
SUPPRESSED CARRIER VESTIGIAL-SIDEBAND COMMUNICATION SYSTEM
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3484723 |
DOUBLY BALANCED MODULATOR WITH SUPPRESSED EVEN HARMONIC SIDEBANDS
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3469192 |
AMPLITUDE CONTROL CIRCUIT FOR SINGLE SIDEBAND GENERATOR BY CONTROLLING THE GAIN OF A DRIVER STAGE
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3460041 |
LINEAR POWER AMPLIFIER CIRCUIT
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3449715 |
TRANSMITTING ARRANGEMENT FOR THE TRANSMISSION OF COMPATIBLE SINGLE SIDEBAND OSCILLATIONS
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3437957 |
MICROWAVE PHASE SHIFT MODULATOR FOR USE WITH TUNNEL DIODE SWITCHING CIRCUITS
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3430157 |
HIGH EFFICIENCY CLASS C AMPLIFIER
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3423698 |
MICROWAVE MODULATOR USING VARIABLE CAPACITANCE DIODE
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3418580 |
Voice signal processing and phase equalizing for ssb system
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3411110 |
Single side band suppressed carrier modulator
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3409832 |
Transmitting arrangements for the transmission of amplitude modulated oscillations
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3396340 |
Constant deviation ratio fm transmitter
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3389327 |
Transistorized suppressed carrier balanced modulator
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3384840 |
Balanced modulator having suppression means
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3381243 |
Controlled sideband modulator
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