Mstar Semiconductor, Inc.

Tung-Sheng Lin

Tai-Lai Tung

Yi-Ying Liao

Kai-Wen Cheng

Ching-Fu Lan

Yu-Hsien Ku

Chu-Hsin Chang

You-Tsai Jeng

Chun-Chieh Wang

Ko-Yin Lai

Ching-Hsiang Chuang

Shao-Ping Hung

Hsin-Chuan Kuo

Chun-Chi Su

Tien Hsin Ho

Wei-Hung Liu

By inserting a symbol start tag at a start of a data segment corresponding to each symbol of a multimedia data stream, and by inserting frame start tags at starts of different frames in a start data segment, data signals belonging to different channels can be precisely and rapidly classified and decoded when the multimedia data stream is performed with demodulation.

Decoding method and multimedia playing system

By determining a scaling factor for scaling signals according to a signal having low bit error rates, and by adjusting soft data using the scaling factor, when soft data are simulated using the Gaussian Model having obvious errors with respect to reality, impacts of signals having low bit error rates are effectively amplified so that impacts of signals having high bit error rates are effectively reduced on the contrary. As a result, the obvious errors introduced by using the Gaussian Model and a low broadcast quality of digital television signals caused by said obvious errors can be neutralized.

Soft demapper, calculating system, and method for calibrating soft data of multimedia data stream

An error correction apparatus for a digital signal received by a signal reception terminal includes two error correction modules. The first error correction module performs first error correction on an input signal to generate an intermediate signal satisfying a termination condition. The second error correction module receives and selectively performs second error correction on the intermediate signal to generate a corrected signal. The termination condition is associated with a maximum error correction capability of the second error correction.

Error correction apparatus and associated method

A signal processing apparatus for receiving a spectral line of an original signal includes a starting point determining module, a searching module and a symbol rate determining module. The starting point determining module finds a maximum energy in the spectral line and determines at least one search starting point according to the maximum energy. From the at least one search starting point, the searching module searches along the spectral line towards a region with a lower energy for at least one minimum energy satisfying a predetermined condition. The symbol rate determining module determines a symbol rate of the original signal according to the at least one minimum energy.

Signal processing method and associated apparatus

An apparatus for estimating channel effects is provided. A receiving module receives first data and first reference information arriving in a first time period, second data and second reference data arriving in a second time period, and third data and third reference data arriving in a third time period. An estimation module estimates channel effects corresponding to the first and third data, and the first, second and third reference data, respectively. A coefficient calculation module performs a Wiener filter coefficient calculation on the channel effects corresponding to the first, second and third reference data to generate a set of time-domain interpolation coefficients. An interpolation module interpolates the channel effects corresponding to the first third data according to the set of time-domain interpolation coefficients to generate a channel effect corresponding to the second data.

Apparatus and method for estimating channel effects

A signal processing apparatus includes an initial detecting module, a mixer, a symbol rate detecting module, a judging module and a correcting module. The initial detecting module determines an initial carrier frequency offset of an input signal according to a spectrum of the input signal. The mixer adjusts the input signal according to the initial carrier frequency offset to generate a frequency-compensated signal. The symbol rate detecting module determines a symbol rate of the input signal. The judging module judges whether the initial carrier frequency offset is correct according to the frequency-compensated signal. When a judgment result of the judging module is negative, the correcting module determines a corrected carrier frequency offset according to the symbol rate and the spectrum.

Signal processing apparatus and associated method

A digital broadcasting receiving system is provided. A receiving module receives an M number of symbols each carrying an N number of subcarriers of a control signal. A converting module performs FFT on respective ksubcarriers of an isymbol and an (i+1)symbol to generate an (i, k)converted value and an (i+1, k)converted value. A demodulating module performs differential demodulation on the (i, k)and (i+1, k)converted values to generate an (i, k)demodulation value. A combining module soft-combines the (i, 1)demodulation value through the (i, N)demodulation value to generate an iprediction value corresponding to the isymbol. A determining module identifies a synchronization segment in the control signal according to the 1prediction value to the (M&#x2212;1)prediction value.

Digital broadcasting receiving system and associated signal processing method

An apparatus for detecting spectrum inversion includes a different correlator and a determining module. The differential correlator performs an odd-order differential correlation on an input signal and a known signal to generate a differential correlation result. When the input signal is determined as corresponding to a target signal of the known signal, the determining module detects spectrum inversion in the input signal according to the phase of the differential correlation result.

Apparatus and method for detecting spectrum inversion

A channel scanning method for Digital Video Broadcasting-Satellite (DVB-S) signals is provided. The method includes: scanning a radio frequency (RF) signal according to a normal frequency step; when the Nchannel is detected, obtaining a difference between a low boundary of an Nchannel and a high boundary of an (N&#x2212;1)channel; and, when the difference is within a predetermined bandwidth range, scanning the RF signal between the high boundary of the (N&#x2212;1)channel and the low boundary of the Nchannel according to a narrow frequency step. The normal frequency step is greater than the narrow frequency step.

Channel scanning method for digital video broadcasting satellite signal

A symbol rate detection apparatus includes an analog-to-digital converter (ADC), a coarse detection module, a mixer, a down-sampling module, and a fine detection module. The ADC converts an analog input signal to a digital input signal at an original sampling frequency. The coarse detection module estimates a carrier frequency offset and a coarse symbol rate according to the digital input signal. The mixer adjusts the frequency of the digital input signal according to the carrier frequency offset to generate a frequency-compensated signal. The fine detection module determines a fine symbol rate according to the frequency-compensated signal.

Apparatus and method for detecting symbol rate

An apparatus for correcting a phase error is provided. The apparatus includes an error estimating module and a correcting module. The error estimating module receives a phase-shift keying signal, and calculates a phase error according to the phase-shift keying signal, a plurality of known candidate signals and Bayesian estimation. The correcting module corrects the phase-shift keying signal according to the phase error.

Apparatus and method for correcting phase error

A packet processing method applied in a packet receiver is provided. An approximate bit rate is first determined according to time stamps of two different packets. The approximate bit rate is corrected according to a time stamp of another packet to generate a fine-tuned bit rate. According to the fine-tuned bit rate, one or more subsequent packets are read out from a buffer. The time stamp of a subsequent packet is provided according to the approximate bit rate.

Packet receiver and packet processing method thereof

A readdressing decoder for QC-LDPC decoding including a memory, a controller and parallel processors is provided. The memory stores a QC-LDPC matrix including sub-matrices respectively addressed with a corresponding address. The controller readdresses each of the sub-matrices into divided matrices and defines each of the divided matrices into a first address group and a second address group. The controller further respectively transmits the divided matrices of the first address group and the second address group to the parallel processors to perform correction algorithm.

Readdressing decoder for quasi-cyclic low-density parity-check and method thereof

A decoding method for determining a preferred survivor path in a decoding process is provided. The method includes calculating a first determination value of a first survivor path at a first time point, the first determination value being determined by a first sub determination value and a second determination value at a second time point, and the second time point being prior to the first time point; calculating a third determination value of a second survivor path at the first time point, the third determination value being determined by a second sub determination value and a fourth determination value at the second time point; and when a difference between the first determination value and the third determination value is equal to or less than a predetermined value, determining the preferred survivor path at the first time point according to the second and the fourth determination values, or the first and the second sub determination values.

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Hsinchu County, Taiwan

Tung-Sheng Lin