| Patent application number | Description | Published |
|---|
| 20090086108 | Method and System for Scanning a Frequency Channel in Digital Television - One embodiment sets forth a method of scanning a frequency channel, which includes receiving a radio-frequency signal in a selected frequency channel, performing a carrier recovery process, and evaluating a control signal generated during the carrier recovery process to determine the presence of program content in the selected frequency channel. | 04-02-2009 |
| 20090115914 | METHOD FOR ESTIMATING FREQUENCY OFFSETS AND FREQUENCY OFFSET ESTIMATION CIRCUIT THEREOF - A method for estimating frequency offsets is disclosed. The method includes shifting a target signal from a first specific frequency band to a second specific frequency band to generate a pre-offset signal according to a frequency shifting direction, performing a specific filtering operation upon the pre-offset signal to generate a filtered pre-offset signal, shifting the filtered pre-offset signal from the second specific frequency band to a base band to generate a base-band (BB) signal according to the frequency shifting direction, and performing a frequency offset estimation upon the base-band signal. The target signal complies with a specific TV format. The specific TV format is an advanced television system committee (ASTC) format or a digital multimedia broadcast-terrestrial/handheld (DMB-T/H) format. | 05-07-2009 |
| 20090147147 | METHOD AND APPARATUS FOR ADJUSTING CENTER FREQUENCY OF FILTER - The present invention provides a method for adjusting a center frequency of a filter utilized for extracting information carried via a target channel. The method includes: detecting adjacent channel interference (ACI) for the target channel to generate a channel interference information; and adjusting the center frequency of the filter for the target channel according to the channel interference information. | 06-11-2009 |
| 20090190700 | METHODS AND DEVICES FOR PROCESSING SIGNALS TRANSMITTED VIA COMMUNICATION SYSTEM - A method for processing signals transmitted via a communication system includes: generating a first parameter associated with a signal power of a first signal; performing an adjacent channel interference (ACI) filtering operation upon the first signal to generate a second signal; generating a second parameter associated with a signal power of the second signal; comparing the first parameter with the second parameter to generate a comparison result; and detecting whether ACI exists in the communication system according to the comparison result to generate a detection result. | 07-30-2009 |
| 20090207898 | METHOD APPLIED TO AN EQUALIZER FOR REDUCING ISI AND RELATED ISI REDUCTION APPARATUS - A method applied to an equalizer includes receiving an input data-stream having a training sequence component with a first number of symbols and a data component with a second number of symbols, wherein the first number plus the second number equals a third number; when a symbol number is not greater than the first number, training the training sequence component to generate a first trained coefficient set; when the symbol number is between the first number and the third number, recycling the training sequence component to generate a recycled training sequence component, and training the recycled training sequence component to generate a second trained coefficient set; storing the input data-stream to generate a delayed input data-stream when the symbol number is not greater than the third number; and applying the second trained coefficient set to the equalizer when the symbol number is greater than the third number. | 08-20-2009 |
| 20090213921 | CARRIER RECOVERY SYSTEM AND CARRIER RECOVERY METHOD - The invention provides carrier recovery systems and carrier recovery methods. The carrier recovery system comprises a compensation signal generator, a compensation device and a mode selector. The compensation signal generator generates a compensation signal based on a coherent demodulated signal. In a first mode, the compensate device is couple behind an equalizer; the coherent demodulated signal is generated by the compensation device which compensates the output of the equalizer with the compensation signal. In a second mode, the compensate device is coupled prior to the equalizer, compensating the output of a synchronizer with the compensation signal to generate the input of the equalizer. In the second mode, the compensation signal generator receives the output of the equalizer as the coherent demodulated signal. The mode selector switches the carrier recover system from the first mode to the second mode when an estimated frequency offset satisfies a first criterion. | 08-27-2009 |
| 20090252235 | METHOD OF MODULATION MODE DETECTION FOR COMMUNICATION SYSTEM - A method of modulation mode detection for a communication system including at least a channel transmitting signals utilizing a target modulation mode is provided. The method includes: (a) selecting a default modulation mode for the channel; (b) estimating a timing frequency offset (TFO) of the channel of the communication system for obtaining at least a TFO value and storing the TFO value; (c) comparing the TFO value with a first predetermined value to generate a comparison result; and (d) determining whether the default modulation mode is substantially identical to the target modulation mode according to the comparison result. | 10-08-2009 |
| 20100225822 | DIGITAL RECEIVER AND METHOD THEREOF - A digital receiver includes an analog front-end circuit, an automatic-gain controller, a compensation circuit, and a demodulator. The analog front-end circuit receives an input signal, adjusts an average amplitude of the input signal, and converts the adjusted input signal to generate a digital signal according to a control signal. The automatic-gain controller is coupled to the analog front-end circuit for generating the control signal feedback to the analog front-end circuit according to the digital signal. The compensation circuit is coupled to the analog front-end circuit for detecting an average amplitude of the digital signal to generate a detecting result and for determining whether to compensate the average amplitude of the digital signal to generate a compensated digital signal according to the detecting result. The demodulator is coupled to the compensation circuit for demodulating the compensated digital signal to generate an output signal. | 09-09-2010 |
| 20100296569 | DIGITAL DEMODULATING APPARATUS FOR TIMING ERROR DETECTION - The invention discloses a digital demodulating apparatus for timing error detection, including a numerically controlled oscillator, an equalizer unit, a decoder and a timing error detector. The numerically controlled oscillator generates a first sequence signal according to an input sequence signal and a timing error sequence signal. The equalizer unit equalizes the first sequence signal to generate an equalized sequence signal. The decoder decodes the equalized sequence signal to generate to generate an output sequence signal. The timing error detector generates the timing error sequence signal according to the first sequence signal and one of the equalized sequence signal and the output sequence signal. | 11-25-2010 |
