|
Match
|
Document |
Document Title |
|
|
6950481 |
Digital television receiver converting vestigial-sideband signals to double-sideband AM signals before
A vestigial-sideband (VSB) signal is converted to a double-sideband amplitude-modulation signal having information that is subsequently detected in the double-sideband amplitude-modulation signal....
|
|
|
6426716 |
Modulated pulse doppler sensor
A range gated microwave motion sensor having adjustable minimum and maximum detection ranges with little response to close-in false alarm nuisances such as insects or vibrating panels. The sensor...
|
|
|
6081697 |
Multi-carrier radio system and radio transceiver implementation
A multi-carrier radio system in which pairs of subcarriers are positioned in frequency such that each subcarrier in a pair is the image of the other subcarrier in the pair. By making each...
|
|
|
5742645 |
Method of digital demodulation of a composite signal
A method for digitally demodulating a complex modulation signal and allowing different parameters to be transmitted thereby. The input signal is baseband filtered and a complex demodulation is...
|
|
|
5459432 |
Use of a chopper and a sigma-delta modulator for downconverting and digitizing an analog signal including information modulated by a carrier
To demodulate an analog signal having information modulated by a carrier, the analog signal is chopped by a chopper, the chopped signal is digitized by a sigma-delta analog-to-digital converter to...
|
|
|
5361036 |
Complex digital demodulator employing Chebychev-approximation derived synthetic sinusoid generation
To demonstrate a signal, the signal is sampled and each sample of the signal is multiplied by the sine and the cosine of a phase angle indicating when the sample was taken from the signal. The...
|
|
|
5115201 |
Digital demodulator
A digital demodulator utilizes voltage to frequency converters, digital counters and a computer to combine demodulation and analog to digital conversion into one step, therefore providing for...
|
|
|
5077542 |
Transmission system with suppressed carrier signal amplitude modulation preserving the polarity of the transmitted signal, and corresponding transmitter and receiver
A system of transmission with amplitude modulation for the transmission of signals of all types, analog and/or digital, requiring high performance characteristics with respect to the noise induced...
|
|
|
4893341 |
Digital receiver operating at sub-nyquist sampling rate
A digital receiver samples data from an amplitude modulated subcarrier at a rate less than twice the subcarrier's maximum frequency by sampling at known phase points. Sampling at known phase points...
|
|
|
4794623 |
Recovery of carrier signal from QAM double sideband suppressed carrier IF signal for use in synchronous demodulation
A novel circuit recovers a carrier signal from a 16 or 64 QAM double sideband suppressed carrier IF signal for use in synchronolus demodulation. A 70 MHz IF signal is fed to a power splitter for...
|
|
|
4510467 |
Switched capacitor DSB modulator/demodulator
An integrated single-sideband modulator comprises six integrated capacitors C1-C6 and first switch means alternately connecting C1 and C2 as feedback capacitors across a differential input...
|
|
|
4443769 |
Frequency search system for a phase locked loop
A sampling PLL circuit features a frequency sweep caused by an offset voltage applied to an integrator to avoid false lock ups. At one end of the frequency range the polarity of the offset signal...
|
|
|
4430620 |
Demodulator system for double sideband suppressed carrier amplitude modulation
A system and a receiver for transmission of signals by a double sideband amplitude modulated carrier with the carrier suppressed, known as a DSBSC wave, without reinsertion of the carrier at the...
|
|
|
4419759 |
Concurrent carrier and clock synchronization for data transmission system
The present invention is directed to circuitry for achieving concurrent synchronization of carrier phase and clock timing in double-sideband, suppressed carrier transmissions systems. A phase-lock...
|
|
|
4412181 |
Process for the demodulation of an amplitude modulated signal and demodulator performing this process
A process for the demodulation of an amplitude modulated signal composed of two suppressed carriers, at a same frequency F and in phase quadrature, which are respectively modulated by two...
|
|
|
4336616 |
Discriminator aided phase lock acquisition for suppressed carrier signals
A discriminator aided technique for acquisition of phase lock to a suppressed carrier signal utilizes a Costas loop which is initially operated open loop and control voltage for its VCXO is derived...
|
|
|
4253066 |
Synchronous detection with sampling
In receiving apparatus for a double-sideband amplitude-modulated wave, a synchronous detector which samples the modulated wave for short periods centered on instants of peaks of the carrier at...
|
|
|
4253189 |
Circuit for recovering the carrier of an amplitude modulated synchronous digital signal
The present invention comes within the field of synchronous digital transmission. It relates to the recovering the carrier (which may be suppressed carrier) of an amplitude modulated synchronous...
|
|
|
4178553 |
Sampling modulated waves
The method of transmission of a carrier double-sideband amplitude-modulated by a message, comprising sampling the modulated wave at regular intervals at a sampling rate greater than twice but less...
|
|
|
4105981 |
Synchronous demodulation device
A demodulation signal results from the sum or difference of two output signals, respectively from two demodulators applied in parallel with the signal for demodulation and in quadrature by a local...
|
|
|
3940716 |
Double-balanced modulating and demodulating apparatus
A double-balanced modulating and demodulating circuit is disclosed for producing from carrier and modulating input signals at least one double sideband suppressed carrier signal. A pair of...
|
|
|
3852672 |
FOUR-QUADRANT MULTIPLIER-NOTCH FILTER DEMODULATOR
A carrier-suppressed amplifier demodulator employing a four-quadrant multiplier in such a fashion that all of the signal generated sidebands of the carrier and the carrier frequency are multiplied...
|
|
|
3792364 |
METHOD AND APPARATUS FOR DETECTING ABSOLUTE VALUE AMPLITUDE OF AM SUPPRESSED CARRIER SIGNALS
Apparatus for detecting the absolute value amplitude of amplitude modulated suppressed carriers includes first and second product detectors which use quadrature phases of a locally generated...
|
|
|
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...
|
|
|
3714595 |
DEMODULATOR USING A PHASE LOCKED LOOP
An FM stereo demodulator uses a phase locked loop to synchronize a 76 kHz oscillator with a received 19 kHz pilot. A two stage binary frequency divider is coupled in cascade with the oscillator to...
|
|
|
3626090 |
AUTOMATIC PHASE CONTROL SYSTEM FOR USE IN SUPPRESSED CARRIER TELEVISION TRANSMISSION
An automatic phase control system specially adapted for use in receiving and demodulating television signals which are transmitted with the carrier effectively suppressed. The automatic phase...
|
|
|
3553354 |
SYNCHRONOUS AM DEMODULATOR
A demodulator system for color television receivers having two substantially identical demodulator means for demodulating respectively the red and blue color signals, each of the demodulator means...
|
|
|
3537017 |
DEMODULATOR FOR DOUBLE SIDEBAND SUPPRESSED CARRIER SIGNALS
|
|
|
3514720 |
TRANSFORMERLESS BALANCED-TYPE AMPLITUDE OR PHASE MODULATOR-DEMODULATOR CIRCUIT
|
|
|
3483488 |
BALANCED MODULATOR-DEMODULATOR CIRCUIT WITH NEGATIVE FEEDBACK IN SWITCHING ELEMENT
|
|
|
3482174 |
PULSE SAMPLE TYPE DEMODULATOR INCLUDING FEEDBACK STABILIZING MEANS
|
|
|
3466400 |
COMBINED SYNCHRONOUS DEMODULATOR AND ACTIVE MATRIX
|
|
|
3430151 |
AMPLITUDE MODULATION DETECTOR FOR SINGLE SIDEBAND OR SUPPRESSED CARRIER INPUT
|
|
|
3408581 |
Digital suppressed carrier demodulator
|
|
|
3375453 |
Suppressed carrier demodulation circuit
|
|
|
3364429 |
Demodulator circuit including complementary transistors and means for applying forward and cutoff bias
|
|
|
3306981 |
Coding and receiving circuits for compatible stereophonic broadcast systems
|
|
|
3294912 |
Stereophonic fm receivers having automatic switching means for stereo reception
|
|
|
3283079 |
Phase control network for a stereophonic system
|
|
|
3209270 |
Phase-controlled synchronous demodulator
|
|
|
3167615 |
F. m. stereo demodulator using a diode ring modulator switching circuit
|
|
|
3151218 |
Suppressed-carrier amplitude-modulation detector for use in an fm stereo multiplex receiver
|
|
|
3129288 |
Frequency modulation receiver
|
|
|
3114004 |
Radio signal receivers
|
|
|
3109143 |
Synchronous demodulator for radiotelegraph signals with phase lock for local oscillator during both mark and space
|
|
|
3108158 |
Synchronous detection multiplex system
|
|
|
3101448 |
Synchronous detector system
|
|
|
3088069 |
Intelligence communication system
|
|
|
3060383 |
Gain regulation circuit
|
|
|
3054956 |
Detector for symbolic waveforms
|