Mediatek Corporation

Mediateck Inc.

Ming-Yang Chao

Pi-Hai Liu

Hsin-Cheng Chen

Szu-Shan Lo

Jen-Hao Yeh

Ching-Wen Hsueh

Chih-Chuan Liang

Chih-Ching Chen

Jyh-Shin Pan

Yuan-Chin Liu

Jin-Bin Yang

You-Wen Chang

Chien-Hsun Tung

Yao-Jen Liu

Yi Kwang Hu

Data compression/decompression methods and data compressor/de-compressor are provided. The data compression method includes the steps of scaling an input signal to generate a scaled signal; transmitting the scaled signal to a differentiator and an assembler; differentiating the scaled signal and a prior signal to generate a differentiation signal detecting zero bits of the differentiation signal to generate a zero range control signal and a zero range control word; refining the differentiation signal according to the zero range control signal to generate a refined signal; and determining to combine the zero range control word with the scaled signal or combine the zero range control word with the refined signal according to the zero range control word to generate a compressed signal.

Data compression and de-compression method and data compressor and data de-compressor

A trace capture device includes a processing system, a trace capture control unit and a bus unit. The processing system includes at least one function block arranged to generate first data, second data, and correlation information corresponding to the first data. The trace capture control unit is arranged to receive the first data and correlation information corresponding to the first data from the processing system, and generate third data according to the first data and the correlation information. The bus unit is coupled to the processing system, the trace capture control unit and a data link interface. The bus unit is arranged to use the data link interface to transmit information derived from the second data in a first mode, and reuse the first data link interface to transmit information derived from the third data in a second mode.

Trace capture device with common structure and related trace capture method

A jitter measuring method and device, which is capable of measuring jitters in serial digital signal without high-frequency reference clock. The jitter measuring device comprises a rough length measuring unit for measuring rough length for each pulse of the serial digital signal according to a reference clock, and a phase error measuring unit for measuring the phase errors between the edges of the reference clock and the serial digital signal by multi-phase clocks, which are generated by a multi-phase generator according to the reference clock. The jitter measuring device computes the precise length according to the rough length and the phase error, and measures the jitters from the precise length by filters.

Jitter measuring method and device

A data processing system is disclosed. The system includes a processor, a transformer, a first memory buffer, a second memory buffer, a first filter, and a second filter. An obtained transmission signal symbol is first transformed to first data. The first memory buffer stores the first data. The processor obtains peak data based on the first data according to a predetermined threshold. The transformer transforms the peak data to second data and stores the second data in the second memory buffer. The first filter filters the second data to determine reserved data of the second data and removes the reserved data from the second data to generate third data. The transformer transforms the third data to fourth data and stores the fourth data in the second memory buffer. The processor merges the first and fourth data to generate fifth data. The second filter filters the fifth data based on the transmission signal symbol and a previously obtained transmission signal symbol.

Data processing method and system capable of reducing required memory

An optical storage medium recording apparatus is provided a data preparing and ECC encoding circuit that both prepares the data by combining different categories of data into data sequences in accordance with a data layout on the optical storage medium and encodes the combined data. The encoded data is temporarily stored in a data buffer, and subsequently successively read out by a recording circuit for recording onto the optical storage medium according to the data layout. For a Blu-ray disc recording apparatus, the data preparing and ECC encoding circuit includes a LDC/BIS encoder for generating long distance error correction codes (LDC) and burst indicator subcodes (BIS) from the combined data to form LDC and BIS encoded data, which is temporarily stored in the data buffer. The recording circuit includes an interleave circuit for interleaving the LDC and BIS data to form physical clusters for recording on the disc.

Method and apparatus for high speed optical recording

A programmable system for storage of one-time programmable information comprises an interface translator and a one-time programmable device. The interface translator receives and translates a command code to program code comprising a sequence of write instructions and a designated data block. The one-time programmable device is coupled to the interface translator, programmed by the write instructions to store the designated data block. The one-time programmable device can only be programmed once, such that the designated data block being stored is fully protected.

Method and apparatus for one time programming

In a method and apparatus for generating optimum write power, a control unit controls a write voltage generating unit to generate sequentially write voltages of different levels to drive an optical read/write head to generate different write powers so as to write data on a plurality of write intervals of an optical recording medium in sequence. Simultaneously, a detecting and computing circuit detects a peak value, a first level and a second level of a write reflected signal generated by each write interval for computation so as to obtain a first control parameter of each write interval, and detects a peak value, a bottom value and a direct current level of a read reflected signal generated during reading of each write interval for computation so as to obtain a second control parameter of each write interval, thereby generating an optimum write power based on optimal first and second control parameters.

Method for generating control parameters for optimum write power and apparatus therefor

A modulation method for symbols in a frame of a compact disc includes the steps of receiving a plurality of data words, modulating each data word into a code word of a corresponding data symbol, and providing a plurality of combinations of potential merge bits to be inserted between successive symbols of the frame. At least one combination of candidate merge bits is generated according to the plurality of combinations of potential merge bits, a data symbol immediately preceding the location of the candidate merge bits, and a data symbol immediately succeeding the location of the candidate merge bits. The combination of candidate merge bits which minimizes (optimizes) the absolute cumulative DSV is selected when a subsequent group of possible combinations of candidate merge bits is detected or after a predetermined delay, and the selected combination of candidate merge bits is inserted between the two successive data symbols.

Modulation methods and systems

A modulation system includes an encoder for transferring data words to tentative code words. A DSV control bit generator determines the value of a DSV control bit according to the data words or the tentative code words to optimize the cumulative DSVs corresponding tentative code words, wherein the DSV control bit generator determines the value of a current DSV control bit when at least a subsequent DSV control bit is detected. A final code word generator generates final code words according to the determined DSV control bit and the tentative code words.

A modulation method for a first data string having a plurality of symbols is disclosed. The method includes: appending a data string to the first data string to form a second data string; and converting the second data string to a code word sequence by converting each of the symbols in the first data string to a code word according to predetermined modulation rules and a symbol set selected from the second data string. Each code word has a first fixed number of bits, each symbol has a second fixed number of bits, and each symbol set has a fixed number of symbols.

Method and apparatus for encoding/decoding in fixed length

In a high-density optical storage system, data words are modulated into code words in a manner of minimizing the fluctuation of the digital sum value (DSV). A cumulative DSV is calculated for each possible value of a DSV control bit. The DSV control bit is determined to minimize the absolute cumulative DSV when detecting at least one subsequent DSV control bit or after a predetermined delay. A corresponding code word is generated according to the determined current DSV control bit.

A digital delaying device for delaying an input signal includes a ring oscillator, a calibration unit, and at least one delay number calculation unit and delay channel. The ring oscillator includes loop-connected delay cells for outputting an oscillation clock. The calibration unit receives a reference clock and the oscillation clock and calculates a pulse number of the oscillation clock corresponding to each reference clock period. The pulse number serves as a period reference pulse number. The calculation unit receives the pulse number and a signal delay value, calculates a signal delay number corresponding to the signal delay value according to the pulse number, and outputs a selection signal. The delay channel includes a multiplexer and cascaded delay cells, which receives an input signal and generates delay signals with different delay timings. The multiplexer selects and outputs one of the delay signals as an output signal according to the selection signal.

Growing community of inventors

Hsin-Chu Hsien, Taiwan

Ming-Yang Chao