Matches 1 - 46 out of 46


Match Document Document Title
8358993 Image rejection calibration system  
Image rejection calibration includes initializing the calibration mode by applying to quadrature mixers, in place of the wanted RF input, an RF source in the frequency range of the wanted RF...
8116711 Receiver system and method that detects and attenuates noise in a predetermined frequency range  
A receiver system and method for detecting and attenuating noise in a predetermined frequency range. The system includes at least one antenna, at least one filter, at least one automatic gain...
7945226 Method and circuit for adaptive automatic gain control  
A method for adaptive automatic gain control and an automatic gain control circuit are provided. A predetermined waveform is injected into the automatic gain control circuit. A signal is sampled...
7746967 Beam-former and combiner for a multiple-antenna system  
A compensating correction value for adjusting analog signals received from multiple antenna elements takes into account the effects of colored noise, co-channel interference, and inter-sample...
7567788 Transmitter and receiver gain calibration by means of feedback in a transceiver  
The invention relates to gain calibration in a transceiver unit (100) having a transmitter unit and a receiver unit and a feed back coupling (165) between these. A signal level measurement unit...
7551908 High-frequency signal level detection apparatus and high-frequency signal receiver apparatus using the same  
In a high-frequency signal level detection apparatus for detecting an inputted signal level of a high-frequency signal, an AGC circuit executes an AGC on an intermediate frequency (IF) signal...
7515889 Scaling adjustment using pilot signal  
A demodulator (10) converts television signals to video baseband signals and audio baseband signals including stereo signals representing a right channel signal value, a left channel signal value...
6909761 Digital communication system having improved pilot encoding  
A time division multiple access communication system is provided having multiple sub-channels according to known quadrature amplitude modulation techniques. Each sub-channel has a pre-determined...
6567118 Frequency agile adaptive automatic gain control circuit  
An amplifier (125) includes at least one gain stage (210) for amplifying a signal received by the amplifier (125). The amplifier (125) also includes an AGC circuit (400, 500) that adjusts the...
5634191 Self-adjusting RF repeater arrangements for wireless telephone systems  
An RF repeater arrangement for exchanging transmit and receive signals between a handset and a base station in a wireless telephone system automatically compensates for attenuation losses. The RF...
5546421 Self compensating spread-spectrum hybrid  
A communications station (10) couples a bidirectional input-output signal path (16') to two unidirectional signal paths; a transmit signal path (12') and a receive signal path (14'), using a...
5440586 Receiver having reduced influence of oscillator radiation and parasitic crosstalk effects on gain control  
Receiver having an RF input for applying an RF input carrier thereto, which receiver is coupled to a phase-locked loop (PLL) whose signal path incorporates a phase detector, a loop filter, a...
5093930 Directly mixing synchronous AM receiver  
A directly mixing synchronous AM receiver includes a synchronous demodulator coupled to an antenna input for synchronously demodulating an RF-AM reception carrier and a phase-locked loop (PLL)...
4707730 Sync extraction for a broadcasting system with time multiplexing of digital and analog signals  
In a broadcasting system with time division multiplexing of digital signals containing a synchronization pattern and analog signals, sync extraction is achieved with a process including detecting...
4481678 Signal receiving circuit for optical communication  
A signal receiving circuit for optical communication, which receives light modulated with frequencies corresponding to two values, to receive data, comprises an addition circuit provided in the...
4355417 Squelch control circuit for amplitude modulated RF receivers  
A noise squelching circuit for an AM radio in which a phase-locked loop extracts a tone signal which gates an audio frequency amplifier. Tone injection can be accomplished either by frequency...
4031469 Receiver gain calibration  
Receivers with bilateral input stages, such as microwave receivers that are used in noise and RF interference measuring instruments, are gain calibrated in the field by injecting a fixed level...
4030035 Circuit for preventing output clipping of R.F. stage in radio receiver  
In a receiver comprising a radio frequency amplifier stage, a frequency converter stage, an intermediate frequency amplifier stage and a detector, so that the gains of the radio frequency...
3965422 System channel distortion weighting for predetection combiners  
A tropo system channel distortion weighting apparatus for predetection combiners for modifying the predetection combiner algorithm to improve the output carrier to noise ratio in the presence of...
3904968 Threshold extension switch  
A signal sensitive switching circuit for allowing normal receiver operation when the received signal is greater than a predetermined amplitude and for inserting a narrow bandpass filter to reduce...
3895299 Apparatus for automatic adjustment of AGC reference voltage  
In a system including an AGC circuit responsive to broadband RF signals, adjustment of the AGC circuit to maintain the signal in a particular incremental frequency band constant is achieved by...
3831093 SIGNAL-TO-NOISE RATIO DETECTOR FOR AUTOMATIC GAIN CONTROLLED RECEIVERS  
In an automatic gain controlled receiver for receiving alternating periods of signal and noise the transient response to the termination of signal reception is used to produce an indication of...
3704421 PULSE-TO-PULSE INSTANTANEOUS AUTOMATIC GAIN CONTROL CIRCUIT  
The output signal of an intermediate frequency amplifier is applied to a load through a video detector. An operational amplifier is arranged in a feedback loop so that the signal from the...
3671867 NOISE SUPPRESSION ARRANGEMENT FOR COMMUNICATION RECEIVERS  
A noise suppression technique for a communication receiver is disclosed wein the amplitude of the signal at the clipping point with respect to the clipping level, or vice versa, is automatically...
3668533 FEEDBACK CONTROL SYSTEMS  
An amplifier arrangement includes an amplifier and a feed back system for maintaining the amplifier operating at a direct point on a non-linear part of its characteristic. The feed back system...
3593176 ERROR SIGNAL SENSING SYSTEM USING VARIABLE FREQUENCY OSCILLATOR AND UP/DOWN COUNTER  
A feedback and control system for adjusting the gain of an amplifier associated with an input circuit so that such adjustment will automatically reduce the error between a standard signal and an...
3559071 AUTOMATIC GAIN STABILIZATION AND CALIBRATION SYSTEM FOR A RADIO RECEIVER  
3495247 APPARATUS AND METHOD FOR CONTROLLING THE AMPLITUDE OF THE 30-HERTZ VARIABLE SIGNAL IN A VOR SYSTEM  
3470480 DIGITAL COUNTER CONTROLLED AUTOMATIC GAIN REGULATOR EMPLOYING PILOT SIGNAL  
3409827 Feedback-stabilized microwave radiometer  
3378786 Digitalized signal gain control circuit  
3361971 Automatic gain control for multiple receiver channels  
3341778 Optimum pre-detection diversity receiving system  
3262057 Gain control systems  
3215824 Electronic circuit for arithmetic operations  
3196355 Multiple channel gain control  
3162814 Frequency base agc  
3162801 Automatic gain control system using signal suppression  
3112461 Volume expansion in response to level of pilot signal  
2974224 Apparatus for automatic gain control  
2937270 Pulse receiver  
2903576 Diversity receiving combining system  
2853601 Automatic gain control  
2837634 Automatic noise regulation for radar receivers  
2831969 Automatic gain control ratio circuit  
2820111 Keyed automatic gain control means  

Matches 1 - 46 out of 46