| Class / Patent application number | Description | Number of patent applications / Date published |
|---|
| 329315000 | FREQUENCY MODULATION DEMODULATOR | 15 |
| 20100225387 | FM demodulator apparatus and method includes an amplitude locked loop and a delay-line quadrature detector without the use of a limited amplifier - The present invention relates to an FM demodulator incorporating a delay-line quadrature detector without the use of a limiter amplifier. An Amplitude Locked Loop circuit provides a carrier signal with no amplitude variation prior to performing a conversion from frequency modulation to phase modulation. A delay-line performs this conversion using a standard IF ceramic filter with a precise delay of 90 degrees to the un-modulated carrier frequency. The original non-delayed carrier is multiplied with the delayed carrier using a four quadrant linear multiplier to generate a demodulated audio output. | 09-09-2010 |
| 20140347122 | PERIODICALLY RESETTING INTEGRATION ANGLE DEMODULATION DEVICE AND METHOD USING THE SAME - A periodically resetting integration angle demodulation device and a method using the same is disclosed, which uses a waveform multiplier and a periodically resetting integrator to modulate a continuous-time angle modulation signal into a discrete-time signal. The waveform multiplier multiplies the continuous-time angle modulation signal by a square wave signal whose frequency is integer times a carrier frequency, and then transmits the continuous-time angle modulation signal to a periodically resetting integrated circuit. The periodically resetting integrated circuit performs integration during a carrier period to generate a discrete-time angle modulation output signal. The present invention can greatly reduce the difficulty for designing an optical sensing system in the front end without limiting a modulation depth. Besides, the present invention achieves a small volume, high speed, high sensitivity, high reliability, high performance and high condition-adapting properties. | 11-27-2014 |
| 20150137883 | ADAPTIVE FM DEMODULATOR SUPPORTING MULTIPLE MODES - Methods, systems, and devices are described for an adaptive demodulator that supports multiple modes. An FM signal may be received at a demodulator and parameters corresponding to the FM signal may be identified. Connections between multiple modules within the demodulator may be configured, based at least in part on the parameters, to select one of multiple demodulation modes supported by the demodulator to demodulate the FM signal. The modes may include a phase differencing mode, a phase-locked loop (PLL) mode, a frequency-compressive feedback (FCF) mode, and/or a quadrature detector mode. The parameters may include one or both of a signal strength of the FM signal and a maximum frequency deviation of the FM signal. Based on the parameters, one or more signals may be generated to configure the connections within the demodulator. A switch from one mode to another may occur when one of the parameters breaches a threshold value. | 05-21-2015 |
| 329316000 | Plural demodulation | 1 |
| 20100013553 | DEMODULATOR, DIVERSITY RECEIVER, AND DEMODULATION METHOD - A diversity receiver includes: a plurality of demodulating means for demodulating inputted OFDM signals, to output their demodulated signals; noise component calculating means provided for each demodulating means, for calculating noise components included in the demodulated signals outputted from corresponding demodulating means; channel profile calculating means provided for each demodulating means, for calculating channel profiles based upon the demodulated signals outputted from corresponding demodulating means; transmission channel decision means for determining transmission channel based upon the channel profiles; reliability information generating means for generating reliability information indicating reliability of the demodulated signals outputted from each demodulating means, based upon the noise components and the results of the determinations by the transmission channel decision means; a weighting factor calculating means for calculating, depending on the reliability information, weighting factors used in combining the demodulated signals outputted from each demodulating means; and a combining means for combining, depending on the weighting factors, the demodulated signals outputted from each demodulating means. | 01-21-2010 |
| 329318000 | Having specific distortion, noise or other interference prevention, reduction or compensation | 3 |
| 20100085116 | FM DEMODULATOR - There is provided an FM demodulator comprising a transistor (Q | 04-08-2010 |
| 329319000 | Using feedback to reduce distortion, noise or other interference | 2 |
| 20080231355 | Tuner and Demodulating Unit Thereof - A tuner and a demodulating unit thereof are provided. A trap filter for a specific frequency is installed in the IF demodulating unit so as to eliminate a frequency signal acting as a beat component. | 09-25-2008 |
| 20090167428 | Combined Phase-Locked Loop and Amplitude-Locked Loop Module for Switching FM Signals - A combined PLL and ALL module for switching FM signals includes a PLL unit and an ALL unit electrically connected therewith. The PLL unit is used to initially process FM signals received from a co-channel. Outputs of the PLL unit are sent to the ALL unit and processed therein. The PLL unit and the ALL unit are controlled to process the FM signals by adjusting the ratio of second amplitude to first amplitude to closely approach a predetermined value such that the two FM signals are switched. | 07-02-2009 |
| 329323000 | Input signal combined with local oscillator or carrier frequency signal | 5 |
| 20120200348 | APPARATUS AND METHOD FOR DEMODULATION - Apparatus and methods for demodulation are provided. In one embodiment, a method includes receiving an input signal having a frequency that varies in relation to a state of the signal, calculating a sine and cosine of a phase control signal, generating a first signal proportional to the sine of a product of a first quantity and the frequency of the input signal, generating a second signal proportional to the cosine of a product of the first quantity and the frequency of the input signal, and summing a product of the first signal and the cosine of the phase control signal with a product of the second signal and the sine of the phase control signal to generate a demodulator output for resolving the state of the input signal. In certain implementations, the phase control signal is controlled so as to reduce a frequency error of the input signal. | 08-09-2012 |
| 20120313697 | APPARATUS AND METHOD FOR DEMODULATING AN INPUT SIGNAL - The invention relates to an apparatus ( | 12-13-2012 |
| 329325000 | Including phase or frequency locked loop | 3 |
| 20080252368 | CIRCUIT AND METHOD FOR PROCESSING AN INPUT SIGNAL - Circuit for processing an input signal based on at least one reference signal, comprising a phase locked loop demodulator configured to receive a speed control signal and said input signal and further configured to follow a frequency and/or a phase of said input signal at a speed, wherein said speed depends on said speed control signal; and a reference signal detector configured to determine said at least one reference signal and to set said speed by outputting said speed control signal to said phase locked loop demodulator, wherein, if said reference signal detector detects said at least one reference signal, said reference signal detector decreases said speed. | 10-16-2008 |
| 20100141336 | SELECTABLE INTERMEDIATE FREQUENCY DEMODULATOR - A method and apparatus for demodulating an input signal in a selectable intermediate frequency system is disclosed. The apparatus includes a front end module, a filter, and a phase lock loop (PLL). The front end module mixes the input signal with an oscillating signal. The filter includes at least one characteristic that is selectable to configure an intermediate frequency. The PLL demodulates an output frequency based on the output of the filter. | 06-10-2010 |
| 20110260787 | OSCILLATOR, AND RECEIVING DEVICE AND ELECTRONIC DEVICE USING THE OSCILLATOR - An oscillator unit is configured such that a frequency adjustment unit of a synthesizer used by a controller is smaller than a frequency variation tracking capability of a demodulator connected to an output side of a frequency converter. This structure successfully combines the temperature compensation control of an oscillator unit and the receiving process of a high-frequency receiving device. Accordingly, an oscillator unit with large temperature coefficient is applicable to high-frequency receiving devices. | 10-27-2011 |
| 329327000 | Input signal split into plural signals | 3 |
| 20150022263 | DEMODULATION DEVICE, DEMODULATION METHOD AND PROGRAM - The present technique relates to a demodulation device, a demodulation method and a program capable of realizing a demodulation process at a rate equivalent to a case where I and Q channel signals are not inverted, even when the I and Q channel signals are inverted. A frequency correction unit establishes synchronization of a frequency and clock based on a signal from a frequency synchronization unit. A channel inversion detection unit of a frame synchronization unit detects presence or absence of inversion of I and Q channel signals, and supplies, as a detection result, a channel inversion detection result to the channel inversion control unit. The channel inversion control unit switches the I and Q channel signals if the inversion has occurred, based on the channel inversion detection result. This technique can be applied to a demodulation device. | 01-22-2015 |
| 20150109053 | Method for Separating Multi-Component Signals - A method separates a multi-component signal by first estimating parameters of the signal. Then, using periodicity-based algebraic separation and energy-based demodulation, the signal is separated into components according to the parameters and constraints. Last, a Teager-Kaiser energy detector is applied to each component to provide a direct current signal for each component, and the constraint for each component used by the separating. | 04-23-2015 |
| 329336000 | Input signal combined with phase shifted or delayed portion of input signal | 1 |
| 20120044017 | DEMODULATOR AND SYSTEM FOR TRANSMITTING MODULATED INFORMATION, IN PARTICULAR FOR RADIOFREQUENCY IDENTIFICATION TAGS - A demodulator including a delay line adapted for receiving an input signal at an input frequency, phase or frequency modulated by symbols with a duration equal to a period of the input signal or very close to that period. The delay line has N | 02-23-2012 |
