Abstract: The memory control system includes a memory unit, bus master(s), arbiter, and memory controller. The bus masters output bus use request signals, block mode signals, block information, and drive information for data and outputs data corresponding to block/receive read-out data. The arbiter receives request signals and drive information and outputs a master selection signal used to select a bus master to which access is permitted and the drive signal input from the selected bus master. The bus master selection unit receives block mode signals, block information and data corresponding to the bus masters and outputs the block mode signal, block information and bus master data selected according to the master selection signal. The memory controller receives drive information from the arbiter, block mode signal, and block information from the selection unit, and allows data corresponding to respective line block groups to be sequentially-stored in/read out from respective banks.

Abstract: A motion estimation method using adaptive mode decision is disclosed. The method includes a motion vector difference value calculation step of calculating a motion vector difference value using an input motion vector estimation value x component for a current block and an input x offset corresponding to a current SAD. At the MVD Variable Length Coding (VLC) step, the length of a bit string, which is obtained by performing variable-length coding on an MVDx, is calculated. At a motion vector difference value calculation step, a motion vector difference value is calculated using an input motion vector estimation value y component for a current block and an input y offset corresponding to the current SAD. At an MVD VLC step, the length of a bit string, which is obtained by performing variable-length coding on an MVDy, is calculated. Thereafter, the amount of motion vector coding is produced by adding the MVDx and the MVDy.

Abstract: Privacy during communication between video phone terminals is enhanced by eradicating the possibility of eavesdropping through lip reading. Image data on the screen is processed so as not to be recognizable by a third party. Voice data is encrypted and the encrypted data is transmitted and receive. The received data is then decrypted by decoding. The video phone terminal of transmitting side transmits the specially processed entire area or selected area of a picture data so that it will not be recognizable by a third party who does not take part in privacy communication in a video phone terminal of receiving side. The video phone terminal of receiving side receives the processed picture data and recovers the specially processed entire area or selected area of a picture data according to the method processed in video phone terminal of transmitting side.

Abstract: Disclosed are an equal-interval vertical image conversion method and apparatus for converting a CIF (Common Intermediate Format) image into an NTSC (National Television Standards Committee) image. At least one input line (Y(n)) is stored in a line buffer. At least one output line (Y(b)) is read from the line buffer. Coefficients to be applied to the at least one input line (Y(n)) and the at least one output line (Y(b)) are extracted from a weight coefficient set. At least one filtered line (F(n)) is produced by a filtering operation for applying the extracted coefficients to the at least one input line (Y(n)) and the at least one output line (Y(b)). At least one new line (X(m)) is outputted by multiplexing the at least one input line (Y(n)) and the at least one filtered line (F(n)).

Abstract: Disclosed are a motion estimation (ME) apparatus and method using a fast search algorithm for a motion vector (MV) that can significantly reduce the number of computations by making use of the fast search algorithm rather than a conventional full search algorithm and that can allow a user to set a computational complexity level. The fast MV search algorithm causes image degradation of approximately 0.5 dB at most, but can significantly reduce the number of computations. As the number of computations of an ME circuit can be adjusted by input computational complexity parameters, the efficiency of a pipeline structure in which texture encoding and ME are performed in a parallel fashion can be maximized.

Abstract: Disclosed is a high-speed image compression apparatus using a last non-zero detection circuit. A memory stores data corresponding to a result of a quantization operation that quantizes an input. A last non-zero searcher connected to the memory searches for a last non-zero position while the quantization result data is written to the memory, and outputs last non-zero position data. A VLC (Variable Length Coder) finds a pattern from the quantization result data and the last non-zero position data, searches for a variable length code mapped to the pattern, packs the variable length code in a unit of a word, and outputs a compressed stream. The high-speed image compression apparatus can reduce a variable length coding time and can rapidly operate the overall compression system according to a reduced variable length coding time, thereby increasing a frame rate.

Abstract: Disclosed herein is a system for automatically upgrading the firmware of Internet video phones and a method of managing the system. The system includes one or more Internet video phones, an upgrade server, and a Trivial File Transfer Protocol or Hypertext Transfer Protocol (TFTP/HTTP) server. Each of the Internet video phones has information, including a company name, a language type, a version and an Internet Protocol (IP) address, and transmits information, including changed IP information, via an Internet when the IP information changes. The upgrade server performs an update using information transmitted from the Internet video phones and transmits upgrade commands to the Internet video phones when new firmware is distributed. The TFTP/HTTP server transmits the new firmware, which is requested by the Internet video phones in response to the upgrade commands, to the Internet video phones that requested the firmware.

Abstract: Disclosed is a digital video coding system and more particularly technology capable of reducing the load of a CPU (Central Processing Unit) that controls a video coding system for implementing a digital video data compression/decompression standard such as MPEG-1, 2, 4, H.261 or H.263. In a conventional video coding system, the circuit configuration and control method of a variable-length encoder are becoming increasingly complex with the development of a video compression/decompression standard. In a conventional system structure, a complex control operation must be carried out, such that there is a problem in that the load of the CPU controlling the video coding system increases. Thus, the video coding technology is provided to reduce the load of the CPU necessary for controlling a VLC (Variable Length Coding) unit.

Abstract: Disclosed is a video-ready Internet telephone which is compatible with a VoIP (Voice over Internet Protocol) telephone providing a voice communication service over the Internet. The video-ready Internet telephone includes a video processing module for converting a digital video signal into an analog video signal by using a communication protocol for video or converting an analog video signal applied thereto into an digital video signal for transmission through the Internet; and a video input/output module operated in cooperation with the video processing module, for receiving an analog video signal from a camera or receiving the converted analog video signal from the video processing module and displaying corresponding analog video data in response to the received analog video signal on a liquid crystal display (LCD).

Abstract: Disclosed are an IP (Internet Protocol) video terminal with a function for controlling video transmission/reception bandwidth and image quality and a control method thereof. While a call is in progress, the IP video terminal exchanges information with an opposite party and controls a transmission rate and quality of video from the opposite party. Moreover, while the call is in progress, the IP video terminal recognizes a network state and automatically controls video transmission quality according to a change of the network state. The IP video terminal can acquire more natural video by lowering a bandwidth value or/and an image quality value when quality of video from the opposite party is bad during the call.

Abstract: Disclosed is a method for providing service of a multimedia mail box in VOIP service. A service providing method applied to a terminal that processes a multimedia message, comprises the steps of: (a) being in a state in which a terminal at a receiving side cannot make a response to a request from a transmitting side; (b) receiving a call setup request from the transmitting side when a user of the terminal at the receiving side is absent; (c) receiving the call setup request from the transmission side when the user of the terminal at the receiving side is in a busy state; and (d) performing a connection to a location information server and a multimedia mail box according to the presence of a response, from the terminal at the receiving side, to the request from the transmitting side at the steps (a), (b) and (c).

Abstract: Disclosed is a data interface device for accessing an SDRAM (Synchronous Dynamic Random Access Memory). A clock and selective data capturing are used to improve an operating rate of an SDRAM interface and to match data at SDRAM data input and output times. A clock used for driving the SDRAM uses a feedback clock for synchronization in an SDRAM controller as well as the SDRAM as a clock used to drive the SDRAM. The selective data capturing uses a register part for storing data inputted into the SDRAM. The register part for storing the data is configured by double registers that are operated in an alternative manner according to a correlation between the inputted data and the feedback clock.

Abstract: Disclosed is a method for initializing an Internet videophone terminal. In accordance with the method, the Internet videophone terminal is initialized using an initial configuration file therefor based on a specific data format, such that an initial setup process between a service provider and an Internet videophone terminal user can be simplified.

Abstract: The system efficiently interfaces with display data using a single-chip module consisting of a Micro-Processor Unit (MPU) and a video CODEC. GUI data and video data are effectively displayed through LCD interfaces, respectively equipped in both of MPU and video CODEC, when two individual chips of MPU and video CODEC are incorporated into a single-chip module. The MPU and video CODEC may each be equipped with their own LCD interfaces. Thereby, GUI data of MPU and decoding video data of video CODEC are transmitted out to an external LCD driver for performing a display. The system for interfacing with display data is available for various multimedia applications, since a display of video CODEC and MPU can be more efficiently and freely performed through the method of data transmission using a LCD interface commonly supported by a MPU.

Abstract: A specific image is saved in accordance with a video CODEC operated by the multi-frame structure. The method copies and saves a specific image in the process of compressing or decompressing the image of a videophone or a multimedia terminal. Each process utilizes first and second memory spaces of size commensurate with the size of images, and uses alternately two memory spaces as the area for a current image being coded or decoded and the area for a previous image. When the copy request of a specific image is issued during decompressing or compressing of the arbitrary (n)th frame, the image desired to be copied, corresponding to the previous image in the compressing or decompressing process of the (n+1)th frame, is treated as the image saved in said 1st memory space, thereupon the compressing or decompressing process of the (n+2)th frame is processed with respect to the 3rd memory space.

Abstract: A method of searching an MP-MLQ fixed codebook through bit predetermination includes the steps of generating a target vector with amplitude, reducing time to search an optimal pulse array through the bit predetermination and searching all of pulses if two errors have an identical value.

Abstract: A dual-modulus prescaler for a RF frequency synthesizer, which may operate in a high speed and reduce energy consumption with use of a selective latching technique includes a first frequency-dividing circuit for being synchronized to the clock signal to generate a latch control signal, latching the clock signal at a leading edge of the generated latch control signal, changing the frequency-dividing mode from a first frequency-dividing mode to a second frequency-dividing mode when latching the clock signal, and frequency-dividing and outputting the clock signal; a second frequency-dividing circuit for frequency-dividing the frequency divided signal from the first frequency-dividing circuit at a predetermined frequency-dividing ratio and outputting a plurality of frequency divided signals; and a logic operation circuit for logically operating a plurality of the frequency divided signals and the mode control signal to control the frequency-dividing mode of the first frequency-dividing circuit.