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7400836 Optical receiving device and optical receiving method  
An optical receiving device capable of outputting a control signal and a data signal received as an optical signal, even if a received optical power of an optical signal inputted via an optical...
7391833 Channel estimator adopting masking  
Disclosed is a channel estimator adopting masking. In a channel estimator using a CIR (channel impulse response) estimating value, the present invention includes a CIR masking unit removing a noise...
7366264 Method and system for reducing noise in a multi-carrier signal  
A receiver 100 for receiving a multi-carrier signal comprises detection means for detecting 801 the presence of impulse interference within the signal and identifying one or more samples of the...
7272187 Filter circuit and radio apparatus  
A distributor 103 distributes an input signal into two lines of distributed signals with equal amplitudes and equal phases. Buffers 104, 105 suppress interference between distributed signals...
7260163 Noise blanker using an adaptive all-pole predictor and method therefor  
A noise blanker ( 40, 106 ) monitors and removes noise from a sampled signal by adaptive filtering ( 98, 150 ) the sampled signal to generate trained adaptive filter prediction coefficients. The...
7251303 Digital data receiving apparatus and method with system changeover function  
A received, same signal is distributed to two channels, the received signals on the two channels are demodulated to produce a plurality of data streams on each of the two channels, and the...
7236743 Method and arrangement for noise rejection in a receiver circuit  
In a method for interference suppression using a quality-adjustable bandpass filter in a receiver circuit for carrier-modulated received signals (S IN ), the bandpass filtered received signal (B...
7218903 Squelch detecting circuit  
The present invention provides a squelch detecting circuit capable of high-speed transfer while using a reduced number of high-speed operating operational amplifiers to reduce power consumption and...
7076011 Integrated frequency translation and selectivity  
Methods and apparatuses for frequency selectivity and frequency translation, and applications for such methods and apparatuses, are described herein. The method includes steps of filtering an input...
7068990 Receiver for two orthogonally polarized signals  
The inventive receiver has a receiving branch for each of the two signals (EH, EV) and a demodulator (MHE, MVE) and means (SH, SV) for synchronising the phase of the received signal (EH, EV) with...
7006583 Method and apparatus for receiving differential ultra wideband signals  
A receiver may receive ultra-wideband, spread-spectrum differential signals. In some embodiments, the receiver may use a variable bandwidth low pass filter. Lowering or raising the bandwidth of the...
7003059 Jabber counter mechanism for elastic buffer operation  
An Elastic Buffer is provided to process data in a computer network and a write controller is provided to control memory storage operation of such an Elastic Buffer. The write controller may...
6961396 Digital banking circuit  
A digital blanking circuit allows a first digital input signal transition to be passed on to a following stage, but prohibits the passing of subsequent transitions for a predetermined blanking...
6934319 Configurable multimode despreader for spread spectrum applications  
A configurable multimode despreader for spread spectrum applications is disclosed herein. The despreader includes a plurality of data lines, at least one selective coupler coupled to the plurality...
6859645 Squelch detection circuit  
Disclosed is a transmission envelope detector referred to a squelch detection circuit for effectively detecting an element of transmission data in a high speed serial data transmission system. The...
6788923 Receiver noise reduction with expanding gated pulses  
A noise reducer generates a gate signal by detecting noise in a demodulated signal, and changes the lengths the gate pulses indicating the presence of noise according to the electric-field strength...
6775526 Modulated input signal filter  
A modulated input signal is filtered to reduce noise. The state of the input signal controls the state of a switch. Depending upon its state, the switch connects one of two circuits to a gate. The...
6683906 Radio communication apparatus  
A radio communication apparatus subjects each signal which is received via a multi-path and demodulated, to a Hadamard transform at each of fingers, by use of an M-ary quadrature coding scheme,...
6578162 Error recovery method and apparatus for ADPCM encoded speech  
A method and apparatus for reducing the audible “clicks” or “pops” which occur when an ADPCM encoding and decoding system is employed in a communications system in which communication...
6577851 Impulse noise blanker  
A radio back-end integrated circuit that includes a blanking switch having a signal input which receives an IF signal, a control input, and a signal output. Also included is a demodulator having an...
6560301 Integrated frequency translation and selectivity with a variety of filter embodiments  
Methods and apparatuses for frequency selectivity and frequency translation, and applications for such methods and apparatuses, are described herein. The method includes steps of filtering an input...
6480532 Echo cancellation for an ADSL modem  
An echo cancellation functionality taps a digital transmit signal from a transmit channel for processing through an adaptive filter of an echo channel to generate an echo cancellation signal. The...
6473596 Close proximity transmitter interference limiting  
A weaker signal receiving system inclusive of stronger nearby-sourced interference signal cancellation capability. Stronger interference signal cancellation is accomplished by actively canceling or...
6393079 Transient-suppressing mode switch  
A transient-suppressing mode switch ( 100 ) uses a state machine ( 120 ) in conjunction with a soft switch ( 114 ) to control a first mode signal sent from a first mode signal source ( 112 ) to a...
6208700 Apparatus for processing a signal received via an information carrier  
The invention relates to an apparatus for processing a signal received via an information carrier. The apparatus comprises a receiving unit (2) for receiving a signal from the information carrier,...
6122332 Apparatus for reducing impulse noise in high-frequency digital receivers  
A high-frequency radio signal receiving apparatus for digital communication includes a receiving antenna for receiving a high-frequency radio wave, a frequency converter for converting a signal...
6049565 Method and apparatus for audio communication  
6047036 System and method for implementing a mute voice signal upon reception of a ADPCM zero nibble in wireless communications  
A system and method of muting a voice signal in a wireless communication system when an "all zeros" condition of a digitized serial voice input signal is detected. The mute signal which is...
5937005 Error rate measurement apparatus for a mobile radio communications system  
An error rate measurement apparatus for a mobile radio communications system, which quickly and accurately measures the error rate of received signals on a real-time basis with simple hardware. The...
5889821 Low noise front-end blanking and interleaving for satellite reception in pulsed interference environments  
A method and apparatus to enable high-quality digital transmissions to a satellite terminal operating in proximity to a radar source combines interleaving a sequence of channel symbols at a land...
5859880 Multi-stage squelch apparatus, and associated method, for a multi-branch receiver  
Apparatus, and an associated method, for a multi-branch receiver. A receive signal is received at various receiver branches of the multi-branch receiver. Subsequent to selected processing stages of...
5737633 Serial data receiving device having a memory for storing a reception permit signal which enable or disable the device from hand-shaking with the transmitting device  
A serial data receiving device comprises a first memory means for storing serial data while shifting the data bit by bit whenever receiving each one bit of the data and converting the serial data...
5684840 System for eliminating the affected by transmission errors in a digital stream  
A system for eliminating the effects of transmission errors in a digital stream is characterized by the presence of a predictor. The output signal of this system is taken from a predicted signal...
5675614 Digital squelch circuit  
A digital squelch system (100) includes a timing signal generator (102) for generating a reference window. An edge detector (106) detects edges in the input signal during this reference window. An...
5659576 Balanced processing based on receiver selection  
A device and method for receiving a radio signal transmitted over a channel, selecting and deselecting an equalizer, and balancing processing in response to such selection. A radio frequency signal...
5638407 Inversion prevention device  
An inversion prevention device to prevent inversion and provide the best S/N ratio detects a point where the zero crossing is missing from a quantized FM signal. An output is provided by switching...
5629955 Variable spectral response FIr filter and filtering method  
A method and system, for use in a communication system in which data is transmitted in data frames of predetermined time duration, for the positioning of the data within the data frames for...
5615412 Digital squelch tail system and method for same  
A digital squelch tail system (120, 114) selectively attenuates audio output corresponding to a digital signal (156). A bit error rate estimator (210) generates bit error rates (201) for an input...
5564090 Method and apparatus for dynamically adjusting receiver squelch threshold  
An adaptive digital squelch system, responsive to ambient RF background noise, that automatically adjusts the receiver squelch level during intervals when no valid signal is being received. A valid...
5539781 Combining diversity apparatus with squelch function  
In a combining diversity apparatus for a digital multi-valued modulation RF signal, at least first and second receiving antenna units having a space diversity relationship, first and second...
5537675 Splatter controlling noise blanker  
A splatter control circuit (28) for a noise blanking receiver (10) includes a SAW filter (40) having an output (115) in a main signal path. A noise blanker (27) having a control input (86) and a...
5526530 Receiver with squelching responsive to input signal frequency  
In a receiver in which a squelch operation is switched on/off while comparing a reception level for an input frequency with a reference level, the reference level is set every input frequency in...
5493711 Radio receiver for locating the strongest signal carrying a selected program  
A receiver has a random counter, which outputs a timer signal to a control circuit. A zero-cross point detection circuit generates a detection signal which is input to the control circuit. When the...
5473615 Digital supervisory audio tone detector  
A detector for determining the validity of a received code, such as a Digital Supervisory Audio Tone (DSAT) code. A received DSAT code is serially shifted into a shift register (10) which outputs...
5465404 Communications receiver with an adaptive squelch system  
A wireless communications receiver having an adaptive squelch system and operable in multiple states including a receiver (11) that provides a received signal when operating in a clear...
5463662 Apparatus and method for reducing errors in data caused by noise through use of blanking  
An apparatus for snubbing or blanking digital signals representing a band of signals that includes an encoded carrier signal transmitted over a power line. An average signal level is compared with...
5459750 Apparatus and method for discriminating and suppressing noise within an incoming signal  
An apparatus and method for discriminating and suppressing noise within an incoming signal including a first signal processor to generate a first signal representing the incoming signal; a second...
5446921 Circuit for detecting noise and producing a squelch signal  
An apparatus for detecting noise in communications channels in electrical power transmission systems and generating squelch signals, for transfer-trip receivers for performing protection and...
5436934 Differential high frequency level detector and data restoration circuit including squelch offset and slicing offset  
An improved circuit topology for implementing level detection and data restoration operations on an input sinusoid. The differential high-frequency level detector and data restoration circuits of...
5422912 Adaptive weak signal identification system  
An adaptive weak signal identification system having a simple implementation which is capable of rapidly tracking weak signals with time varying frequencies in the presence of a strong interference...
Matches 1 - 50 out of 236 1 2 3 4 5 >