Class / Patent application number | Description | Number of patent applications / Date published |
455182100 | With frequency control | 11 |
20090176467 | TUNER - The present disclosure relates to a tuner capable of receiving a television broadcasting signal of a wide band having an operating frequency bandwidth of 48 MHz˜1 GHz, wherein the tuner filters a radio frequency (RF) signal outputted from the low noise amplifier using a tunable filter. The tunable filter includes according to an embodiment an inductor and a variable capacitor as passive elements to reject harmonics. The tuner includes a mixer which mixes an output signal of the tunable filter with a local oscillator signal and converts the mixed signal to an In-phase and Quadrature IF signal, where the converted IF signal of I channel and Q channel is processed through an IF signal processor and is converted to an appropriate signal by a demodulator. | 07-09-2009 |
20090247100 | Dual Threshold Demodulation in an Amplitude Modulation Radio Receiver - A method, algorithm, circuits, and/or systems for demodulation in an amplitude modulated (AM) radio receiver are disclosed. In one embodiment, a radio receiver can include an amplifier configured to receive a radio frequency (RF) input signal and a gain control signal, and provide an amplified signal, an automatic gain control (AGC) circuit configured to receive a high threshold comparator output and provide the gain control signal, a mixer configured to combine the amplified signal and a local oscillation signal and provide a mixed output, a high threshold comparator configured to compare the mixed output with a reference level and provide the high threshold comparator output, and a low threshold comparator configured to compare the mixed output with the reference level and provide an output of the radio receiver. | 10-01-2009 |
20100093294 | CIRCUIT DEVICE FOR DETECTION AND MOBILE APPARATUS - The circuit device for detection includes: a first terminal | 04-15-2010 |
20100093295 | Direct conversion tuner - A direct conversion tuner down-converts television signals, cable signals, or other signals directly from an RF frequency to an IF frequency and/or baseband, without an intermediate up-conversion step for image rejection. The direct conversion tuner includes a pre-select filter, an amplifier, an image reject mixer, and a poly-phase filter. The pre-select filter, amplifier, and the image reject mixer can be calibrated to provide sufficient image rejection to meet the NTSC requirements for TV signals. The entire direct conversion tuner can be fabricated on a single semiconductor substrate without requiring any off-chip components. The tuner configuration described herein is not limited to processing TV signals, and can be utilized to down-convert other RF signals to an IF frequency or baseband. | 04-15-2010 |
20110195683 | TUNER APPARATUS WITH DIGITAL-TO-ANALOG-CONVERTER MIXER USING SINGLE LOCAL OSCILLATOR - A tuning method and tuner apparatus having a plurality of frequency conversion stages for concurrently receiving more than one channel. To avoid disturbance by oscillator pulling, a multi-phased local oscillator signal required by sub-mixers of a DAC mixer share the same timing reference. To minimize the complexity, die area and power dissipation of the local oscillation generation, a tuning offset is accepted from each of the down-conversion stages, and loss of receiver performance by the tuning offset is avoided by a control function for controlling the receiver circuit to process an increased dynamic range introduced by the tuning offset. | 08-11-2011 |
20140094132 | METHODS AND ARRANGEMENTS FOR LOW POWER ACTIVE RADIO RECEPTION - Embodiments may comprise radio data system logic to enter a sleep mode and wake periodically to receive a data packet. In several embodiments, the data packet is a Radio Data System (RDS) packet and the radio data system logic is RDS logic. Further embodiments may comprise radio data system logic to process the data packet to determine a first type field and to parse the first type field to identify a first indication. In several embodiments, parsing the data packet by the radio data system logic comprises parsing the data packet to determine a program type field and parsing the program type field to identify the first indication as an emergency alert indication. In response to identifying the first indication as a trigger, many embodiments wake up NRSC-5 compliant, In-band on-channel (IBOC) radio logic to process an Active Radio message to output information associated with the first indication. | 04-03-2014 |
455182200 | Automatic (AFC) | 5 |
20090023407 | Adaptive Tuning To Improve Demodulator Performance - A receiver is tuned to a transmission frequency of a data signal after the receiver has already locked onto a frequency carrying the data signal. A frequency offset between a locked frequency of a tuner on the receiver and the actual transmission frequency is determined by a comparator. If the frequency offset is greater than a threshold value, then the tuner is stepped to another frequency and the frequency offset is determined again. The direction of the tuning step can be determined by comparing multiple frequency offsets. An average value of multiple frequency offset measurements may also be used to determine if the tuner should retune to another frequency by comparison with the threshold value. | 01-22-2009 |
20090280761 | BROADCASTING RECEIVER AND OPERATING METHOD THEREOF - Disclosed is a broadcasting receiver. The broadcasting receiver comprises a low noise block down converter outputting a signal by amplifying a received signal, a tuner tuning a plurality of broadcasting channels based on the signals output from the low noise block down converter, and a frequency drift detector detecting frequency drifts of the broadcasting channels tuned by the tuner, and correcting oscillation frequencies of at least one of the low noise block down converter and the tuner. | 11-12-2009 |
20090325522 | RADIO BROADCAST RECEIVING APPARATUS AND RADIO BROADCAST RECEIVING METHOD - A radio broadcast receiving apparatus according to the present invention includes a reception unit for receiving a broadcast signal from a broadcast station of a predetermined frequency; a content information extracting unit for extracting content information related to a content the broadcast station is broadcasting from the broadcast signal being received by the reception unit and storing the content information in a storage unit; a frequency control unit for sequentially switching the frequency to be received by the reception unit; and an electronic program guide generating unit for generating an electronic program guide showing content information related to a content the broadcast station is currently broadcasting based on the content information stored in the storage unit. | 12-31-2009 |
20100130148 | TUNER MODULE - A tuner module includes a filter that reduces the signal level outside the frequency band of a selected channel in an input RF signal of terrestrial television broadcasting, a local oscillation circuit that oscillates a local oscillation signal, a mixing circuit that mixes the RF signal in which the signal level outside the frequency band of the selected channel is reduced by the filter and the local oscillation signal oscillated by the local oscillation circuit to downconvert the RF signal to an intermediate frequency signal, and a control circuit that controls the local oscillation frequency of the local oscillation signal oscillated by the local oscillation circuit. The control circuit adjusts the local oscillation frequency to a value that suppresses an effect of a disturbance wave from other channels within a frequency band of the intermediate frequency signal of the selected channel. | 05-27-2010 |
20120225629 | SYSTEM AND METHOD FOR TUNING A RADIO RECEIVER - A system for tuning a radio receiver includes a radio receiver configured to provide a downconverted digital error signal, a digital synthesizer circuit configured to generate a first local oscillator control signal, a digital automatic frequency control (AFC) circuit configured to generate a second local oscillator control signal, wherein the digital synthesizer circuit is enabled to generate the first local oscillator control signal when the digital AFC circuit is disabled, the first local oscillator control signal corresponds to an estimate of a desired local oscillator frequency, the digital AFC circuit is enabled to generate the second local oscillator control signal when the digital synthesizer circuit is disabled and the second local oscillator control signal corresponds to the desired local oscillator frequency. | 09-06-2012 |