Abstract: The present invention relates an automatic gain control device, which performs a high-speed gain control operation in high-speed data communication using burst signals, generates a gain code without using a memory or storage device to simplify a system configuration, and establishes a correct gain control operation. The automatic gain control apparatus includes a power detector for calculating a mean power of the output signal of the variable gain amplifier; a gain code generator for receiving a mean power from the power detector, and generating a gain code corresponding to the received mean power; and a voltage generator for calculating a difference between the gain code and a target gain code associated with the output signal of the variable gain amplifier to detect an error code, and generating a gain control voltage for compensating for the difference between the two gain codes on the basis of the detected error code.

Abstract: There are provided an apparatus and method for vision processing on a network based intelligent service robot system and a system using the same. A robot can move to a target object, avoiding obstacles without helps of a robot server interfaced with a robot terminal over network, by extracting/processing three-dimensional distance information of external objects, using a stereo camera, a low price image processing dedicated chip and an embedded processor. Therefore, the intelligent robot can travel and move using only a stereo camera image processing without other sensors, and further provides users with various functional services with low expense.

Abstract: A home intelligent service robot for recognizing a user and following the motion of a user and a method thereof are provided. The home intelligent service robot includes a driver, a vision processor, and a robot controller. The driver moves an intelligent service robot according to an input moving instruction. The vision processor captures images through at least two or more cameras in response to a capturing instruction for following a target object, minimizes the information amount of the captured image, and discriminates objects in the image into the target object and obstacles. The robot controller provides the capturing instruction for following the target object in a direction of collecting instruction information to the vision processor when the instruction information is collected from outside, and controls the intelligent service robot to follow and move the target object while avoiding obstacles based on the discriminating information from the vision processor.

Abstract: The present invention relates to a transmitter and a receiver for speech coding and decoding by using an additional bit allocation method. The transmitter and the receiver according to the present invention realize a voice communication service of high quality by using additional bits permitted in system requirements while using a conventional speech coder as it is. In addition, the transmitter and the receiver according to the present invention have an advantage in that they enable insertion of additional quantization blocks while not changing the structure of the conventional standard speech coder, since they allocate additional bits by applying a multi-stage quantization procedure not in a speech signal domain but in a parameter domain.

Abstract: Provided is a sight stabilization apparatus for a mobile robot having a camera. The sight stabilization apparatus includes a camera vibration detector, a moving pattern analyzer, a sight controller, and a camera sight adjustor. The camera vibration detector detects vibration of the camera when the mobile robot moves. The moving pattern analyzer analyzes a moving pattern of the mobile robot based on a type, a moving method, and a moving speed of the mobile robot. The sight controller calculates a vibration compensation value based on the analyzed moving pattern of the mobile robot for compensating for the vibration of the camera. The sight adjustor adjusts a sight direction of the camera according to the vibration compensation value calculated by the sight controller.

Abstract: The present invention relates to a transmitter and a receiver for speech coding and decoding by using an additional bit allocation method. The transmitter and the receiver according to the present invention realize a voice communication service of high quality by using additional bits permitted in system requirements while using a conventional speech coder as it is. In addition, the transmitter and the receiver according to the present invention have an advantage in that they enable insertion of additional quantization blocks while not changing the structure of the conventional standard speech coder, since they allocate additional bits by applying a multi-stage quantization procedure not in a speech signal domain but in a parameter domain.

Abstract: A network-based mobile robot is provided. The mobile robot includes a video encoder, a bit rate analysis unit, an inference unit, and a switch unit. The video encoder encodes an image with a variable bit rate to output bitstreams in a frame unit. The bit rate analysis unit analyzes a size of the bitstreams per frame from the video encoder. The inference unit infers a bitstream output start point and end point by comparing the size of the bitstreams to a predetermined reference value based on the analyzing result and determines whether an object in the bitstreams per frame moves or not. The switch unit selectively starts and ends the inputted image output operation to an internal image processing processor and the bitstream output operation to a remote server that is connected via a network and perform image processing, based on the inferring result of the inference unit.

Abstract: Provided are a speech restoration system and method for concealing packet losses.

Abstract: The present invention is directed to a system-on-chip development apparatus for wire/wireless Internet telephone. The system-on-chip development apparatus for wire/wireless Internet telephone according to the present invention adds functions indispensable to a RISC core, constructs a core kernel section using a device integrating additional FPGAs available to support additional functions, and provides a plurality of interfaces necessary to an Internet telephone function centering around the core kernel section. With this, the number of necessary component parts can be minimized to facilitate design and simplify the configuration thereof.

Abstract: A method and an apparatus for transmitting a speech signal are provided. A speech signal transmitter includes a quadrature mirror filter, a base sub-band encoder, an enhancement sub-band encoder, and a network connector. The quadrature mirror filter receives a speech signal, divides the speech signal into an enhancement band speech signal and a base band speech signal, and outputs the enhancement band speech signal and the base band speech signal. The base sub-band encoder receives and encodes the base band speech signal. The enhancement sub-band encoder receives and encodes the enhancement band speech signal. The network connector multiplexes the encoded enhancement band speech signal and the encoded base band speech signal based on the kinds of networks over which speech signals are transmitted, and transmits the multiplexed signals to the networks. A speech signal is multiplexed and transmitted by various methods based on the kinds of networks. Thus, the speech signal can be efficiently transmitted.

Abstract: A method and an apparatus for transmitting a speech signal are provided. A speech signal transmitter includes a quadrature mirror filter, a base sub-band encoder, an enhancement sub-band encoder, and a network connector. The quadrature mirror filter receives a speech signal, divides the speech signal into an enhancement band speech signal and a base band speech signal, and outputs the enhancement band speech signal and the base band speech signal. The base sub-band encoder receives and encodes the base band speech signal. The enhancement sub-band encoder receives and encodes the enhancement band speech signal. The network connector multiplexes the encoded enhancement band speech signal and the encoder base band speech signal based on the kinds of networks over which speech signals are transmitted, and transmits the multiplexed signals to the networks. A speech signal s multiplexed and transmitted by various methods based on the kinds of networks. Thus, the speech signal can be efficiently transmitted.

Abstract: The present invention relates to a mobile system and a moving method of the mobile system. According to the present invention, a natural period is measured from a vibration component signal generated by a force due to acceleration/deceleration of wheels, and the mobile system moves by applying an acceleration profile containing an acceleration period or a deceleration period based on the natural period. Therefore, the acceleration profile based on the natural period is applied such that vibration that is visible to a user is not generated during acceleration and deceleration of the mobile system. As a result, quality of the mobile system is improved.

Abstract: The present invention relates to a mobile system and a moving method of the mobile system. According to the present invention, a natural period is measured from a vibration component signal generated by a force due to acceleration/deceleration of wheels, and the mobile system moves by applying an acceleration profile containing an acceleration period or a deceleration period based on the natural period. Therefore, the acceleration profile based on the natural period is applied such that vibration that is visible to a user is not generated during acceleration and deceleration of the mobile system. As a result, quality of the mobile system is improved.

Abstract: A DMA controller includes a channel status generator determining whether the state of a channel connected to a peripheral corresponds to the first part of transmission data when receiving a DMA request from the peripheral; an address generator generating addresses of the peripheral and a memory; a control signal generator generating signals representing DMA operation states; and a buffer temporarily storing data from the peripheral and transmitting them to the memory. The address generator generates an address of a register storing a data transmission size of the peripheral when the channel state represents the first part of the data. The control signal generator generates a control signal for receiving a value stored in the register storing the data transmission size.

Abstract: The present invention is directed to a system-on-chip development apparatus for wire/wireless Internet telephone. The system-on-chip development apparatus for wire/wireless Internet telephone according to the present invention adds functions indispensable to a RISC core, constructs a core kernel section using a device integrating additional FPGAs available to support additional functions, and provides a plurality of interfaces necessary to an Internet telephone function centering around the core kernel section. With this, the number of necessary component parts can be minimized to facilitate design and simplify the configuration thereof.

Abstract: There is provided an encoder for a wide-band low transmission rate speech signal, which includes: a pre-processing and down-sampling unit, which down-samples a speech signal frame sampled at a high frequency, at a low frequency, and outputs a speech signal frame without DC components; a LPC analysis and ISP quantization unit, which receives the down-sampled speech signal, determines a linear prediction coefficient of the received speech signal frame, converts the linear prediction coefficient into an ISP coefficient, quantizes the converted result, and outputs an index of the ISP coefficient; a residual signal calculation unit, which calculates a residual signal that models an excitation signal of a synthesis filter for the down-sampled speech signal; a random vector generation block which generates a random vector for modeling the excitation signal; a gain calculation block, which calculates a gain for scaling the random vector; and a gain quantization block, which quantizes the gain and creates an index of

Abstract: A line spectral frequency (LSF) coefficient vector quantizer greatly affects wideband speech coding efficiency and performance. An LSF coefficient quantizer of an existing speech codec can be modified into a new structure in which a non-structural vector quantizer and a lattice quantizer are connected in series. Thus, memory capacity and search time required for the LSF coefficient quantizer can be reduced. In addition, a prediction structure and a non-prediction structure can be connected in parallel to stably perform quantization and reduce a quantization transfer error. As a result, an efficient LSF quantizer capable of reducing allocated bits and improving SD can be provided. Moreover, non-structural vector quantization can be performed prior to pyramid vector quantization to convert an input value into a Laplacian model suitable for a pyramid vector quantizer.

Abstract: An apparatus and method for shaping the speech signal in consideration of its energy distribution. The shaping apparatus includes an encoder for receiving and encoding an unvoiced speech or background noise, dividing it into frequency bands according to its characteristics, performing comparison of energies of the frequency bands, and setting energy intensity flags according to the comparison result; and a decoder for shaping the data encoded by the encoder and the energy intensity flags. The present invention employs the shaping method in consideration of characteristics of the original input speech signal, and uses the shaping filter only using information about energy distribution without adding a large amount of bits to the signal that is difficult to synthesize, such as an unvoiced speech and background noise.

Abstract: The system for transmitting and receiving a wideband speech signal includes an A/D converter for receiving an analog speech signal to convert it into a digital speech signal, a transmitter analysis filter for receiving the digital speech signal and dividing it into a baseband signal and an enhancement residual band signal, a standard baseband encoder for accepting the baseband signal and coding it using an ITU-T encoder, an additional baseband encoder for reducing standard coding distortion in the baseband signal, an enhancement residual band encoder for coding a signal obtained by removing the coded baseband signal from the original digital speech signal, and an IP network interface for multiplexing the coded standard and additional baseband signals and enhancement residual band signal.

Abstract: Disclosed is a voice activity detector using a complex Laplacian statistic module, the voice activity detector including: a fast Fourier transformer for performing a fast Fourier transform on input speech to analyze speech signals of a time domain in a frequency domain; a noise power estimator for estimating a power of noise signals from noisy speech of the frequency domain output from the fast Fourier transformer; and a likelihood ratio test (LRT) calculator for calculating a decision rule of voice activity detection (VAD) from the estimated power of noise signals from the noise power estimator and a complex Laplacian probabilistic statistical model.