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7558340 VSB receiver and carrier recovery apparatus thereof  
There are provided a VSB receiver and a carrier recovery apparatus thereof, in which a carrier is recovered using a VSB modulated signal. In the VSB receiver, a digital processing part selects a...
7535976 Apparatus and method for integration of tuner functions in a digital receiver  
A receiver to process a RF input signal having a plurality of channels includes a direct down conversion circuit, a demodulation circuit, and a local oscillator circuit. The direct down conversion...
7463692 Device and method for symbol clock recovery in digital television  
A device and method for a symbol recovery in a digital television are disclosed. The device includes a symbol clock recovery device includes a remained phase error remover operating a digital...
7457375 Timing extractor, timing extraction method, and demodulator having the timing extractor  
In a timing component extractor for a digital modulated signal, a frequency converting section 30 receives a complex baseband signal having a symbol rate fs and formed from an I signal and a Q...
7342986 Digital PLL device  
A phase-locked-loop device includes a clock generator for generating a reference clock based on a binarized playback signal and a frequency of run-length data and for generating N-phase clocks...
7336732 Carrier frequency detection for signal acquisition  
A carrier frequency in a filtered received M-ary phase-shift keyed (MPSK) modulated signal having in-phase and quadrature components is detected by processing the filtered received signal to remove...
7277502 Carrier recovery apparatus  
A carrier recovery apparatus capable of detecting a phase error of modulation signal by a simple calculation, reducing the circuit scale, and improving the frequency capture characteristic and...
7263139 Phase correction for a phase modulated signal with mutually interfering symbols  
A circuit and method for correcting phase of a received phase modulated (PM) signal. The method uses k most recently received data bits, which alternate between in-phase I and quadrature Q bits, as...
7248664 Timesliced discrete-time phase locked loop  
A time-sliced discrete-time Phase Locked Loop which is suitable for simultaneously synchronizing multiple input signals to multiple output signals is provided by implementing a discrete-time phase...
7233632 Symbol timing correction for a phase modulated signal with mutually interfering symbols  
A circuit and method for correcting timing of a received phase modulated signal. The method uses k most recently received data bits as an address for a lookup table 60 . The lookup table includes...
7187727 Clock and data recovery circuit and clock control method  
To provide a clock and data recovery circuit which facilitates alteration of the frequency range and adjustment of characteristics. The clock and data recovery circuit includes a phase shift...
RE38876 System for, and method of, processing quadrature amplitude modulated signals  
Analog signals encoded with quadrature amplitude modulation (QAM) pass through a coaxial cable at a particular baud rate. These signals have a carrier frequency individual to the TV station being...
6940923 Demodulating device, broadcasting system, and semiconductor device  
A demodulating device capable of high-efficiency, high-accuracy phase noise correction control and improved in quality and reliability. A digital signal generating portion synchronously detects a...
6937684 Phase discriminator with a phase compensation circuit  
A differential phase discriminator includes a phase compensation circuit to compensate for timing drift and error for recovering timing information in a digital phase lock loop. The differential...
6861900 Fast timing acquisition for multiple radio terminals  
A method and apparatus are provided that performs timing acquisition for multiple radio terminals. According to one aspect of the present invention the invention includes receiving a sequence of...
6781447 Multi-pass phase tracking loop with rewind of current waveform in digital communication systems  
A demodulator demodulates a modulated signal waveform in a data communication system. A phase tracking loop tracks the phase of said modulated signal waveform and having an inner block decoder...
6731698 Quadrature demodulation circuit capable for canceling offset  
When a clock reproduction circuit ( 6 ) is locked, a phase comparator ( 9 ) detects a level difference ΔE between a zero crossing point and a true 0 level. The level difference ΔE represents an...
6727772 Method and system for synchronizing a quadrature amplitude modulation demodulator  
In some embodiments of the present invention, there is a system and method of synchronizing a QAM demodulator by determining a phase offset error value between an actual phase shift of a received...
6717462 QPSK and 16 QAM self-generating synchronous direct downconversion demodulator  
A system for recovering and demodulating a carrier includes a carrier recovery loop and a data detector. The carrier recovery loop receives the carrier as an input and produces a recovered carrier...
6683493 Timing reproducing device and demodulator  
In-phase and orthogonal components of a base band signal having a preamble symbol are squared to obtain squared in-phase orthogonal components. Amount of correlation is obtained between the squared...
6614841 Signal processing apparatus  
A reproduced signal is adaptively equalized in an adaptive equalizer after going through an AD converter. The AD converter, the adaptive equalizer, a phase error detector, a phase shifter, a DA...
6522703 Estimating frequency offset to demodulate a packet of phase-modulated symbols  
The invention relates to a method of estimating the frequency offset of a packet of phase modulated symbols received with phase error, the method comprising: applying a phase correction to the...
6433630 Phase shifter, and demodulator employing it  
In a demodulator, a local oscillator 7 feeds a local oscillation signal having a frequency of f/n to a phase shifter 8 . In the phase shifter 8 , all-pass filters 9 and 10 produce two...
6415004 Phase detector, timing recovery device using the same, and a demodulator using the timing recovery device  
In the present invention, the amplitude subtracting type of phase detector of the timing recovery section outputs a difference γ i of a synthesized amplitude deviation at ½ of a symbol time. The...
6411658 Demodulation device  
A demodulation device having a demodulating circuit that conducts the primary demodulation of received modulation wave, and a carrier recovery circuit that regenerates a carrier from demodulation...
6408036 Detection circuits  
In a detection circuit for ASK or OOK modulation, the received modulated signal is ac coupled to a dc restoration circuit and amplified. The dc restoration is carried out on signal peaks...
6363124 Phase-noise compensated digital communication receiver and method therefor  
A phase-noise compensated digital communication receiver ( 40, 40′, 40″ ) includes a carrier tracking loop ( 56 ) which imposes a transport delay on a carrier tracking loop signal ( 60 ) before...
6356599 AFC device and method of controlling reception frequency in a dual-mode terminal  
An AFC (Automatic Frequency Control) device and a method of controlling reception frequency in a dual-mode terminal. When a dual-mode terminal uses one or two AFC devices, the time required for...
6307898 Phase error detector  
A phase error detector in a digital demodulator estimates phase error by dividing the difference between an in-phase demodulated signal and the transmitted data values included in the in-phase...
6285721 Method for assisting simple synchronization to the carrier of a dispersed-energy QPSK signal  
A method for simple synchronization of a receiving device to a transmitting device for a transmission of a dispersed-energy QPSK signal. The signal is composed at the transmitting end of two mixed...
6282249 Satellite receiver  
Proposed is a switchable loop filter structure which allows a dual mode operation. A low bandwidth mode is used during acquisition of a channel. In case of high rate reception the low bandwidth...
6278746 Timing recovery loop circuit in a receiver of a modem  
A method and apparatus for timing recovery in modem receivers. The timing recovery circuit includes a voltage controlled oscillator for controlling the voltage controlled sampling frequency of an...
6201447 Phase synchronization circuit with units for setting sweep frequency and control voltage  
Improved phase synchronization circuits shorten the length of the synchronization pull-in time. The phase synchronization circuit according to the first invention changes the free-running frequency...
6195400 Two-mode demodulating apparatus  
A two-mode demodulating apparatus for use in a radio terminal in a mobile communication system has a linear reception demodulating circuit and a non-linear reception demodulating circuit which can...
6181750 Apparatus for estimating the frequency difference existing between the carrier frequency of a digital signal and the frequency of a receiver local oscillator  
An apparatus estimates the frequency difference existing between the carrier frequency of a received digital signal and the frequency of a signal from a local oscillator contained in a receiver of...
6163276 System for remote data collection  
A remote data collection system for collecting usage data from an endpoint includes a monitoring module coupled to the endpoint, the monitoring module having a wireless transmitter to transmit the...
6163208 One bit digital phase shift keyed carrier recovery and demodulator circuit  
A phase shift keyed carrier recovery and demodulator circuit which includes a phase detector and subsequent feedback control loop circuitry which maintains an initial phase relationship. By...
6154512 Digital phase lock loop with control for enabling and disabling synchronization  
The invention relates to methods and apparatus for synchronizing a local data clock with timing information from received data, during a fraction of a frame period. The apparatus includes a...
6147560 Method and device relating to supervision and control of an oscillator signal  
The present invention relates to methods and devices for such control and supervision of an oscillator signal from a controllable oscillator that is done mainly to control the frequency variation...
6140869 Device for demodulating a binary phase-shift keyed signal  
A device for demodulating a binary signal having a predetermined carrier frequency and phase-modulated by encoded pulses. The device includes a phase-locked loop circuit having a phase comparator...
6127884 Differentiate and multiply based timing recovery in a quadrature demodulator  
A differentiate and multiply based timing recovery in a quadrature demodulator. A quadrature-modulated signal is received and demodulated by quadrature mixing the received modulated signal with a...
6115432 High-frequency signal receiving apparatus  
A high frequency signal receiving apparatus comprises a microcomputer, coupled to a control terminal of PLL circuit, interface circuit of demodulating section and to a control terminal of decoding...
6104237 Method for estimating phase in demodulator  
A signal from a local oscillator is separated by a 90° phase sifter into an in-phase component and an orthogonal component. Each of the components is multiplied by a received IF signal in a mixer...
6081572 Lock-in aid frequency detector  
Circuit and method for generating a signal for use in locking a second signal on a first signal. The first and second signals have an associated frequency. A first beat note signal and a second...
6075408 OQPSK phase and timing detection  
A method and an apparatus for generating an error estimate as input for an error recovery loop of a demodulator which receives an offset quadrature phase shift keyed (OQPSK) signal having a symbol...
6031428 Steered frequency phase locked loop  
A Steered Frequency Phase Lock Loop (SFPLL) comprises a phase loop that functions like a normal phase locked loop (PLL) and locks to the input signal, and a frequency loop that uses a reference...
6009126 Zero-IF receiver  
Known is a zero intermediate frequency receiver or zero-IF receiver in which DC-offset correction is done in the I- and Q-paths, after mixing down of the received RF-signal or of an IF-signal. Such...
6008692 Carrier wave synchronization for multi-level two-dimensional modulation alphabets  
In a method for realizing carrier wave synchronization in the receptio of a multi-level, two-dimensional modulation signal, the received signal is demodulated by using at least one local oscillator...
5982200 Costas loop carrier recovery circuit using square-law circuits  
By using the two square-law circuits for squaring the common mode and orthogonal components of the carrier wave and by using the multiplying circuit for multiplying these squared signals, the...
5969570 Reduced-tap filter in a demodulator  
A demodulator with a filter having a reduced number of filter taps without a sacrifice in filter accuracy. The demodulator includes elements that generate a data stream that carries a component of...
Matches 1 - 50 out of 171 1 2 3 4 >