Electronics and Telecommunications Research Institute

Korea Telecommunication Authority

Dae-Hwan Hwang

Kyung-Tae Kim

Hong-Goo Kang

Young-Cheol Park

Ki-Seung Lee

Dae-Hee Youn

Ho-Sang Sung

Sung-Kyo Jung

Woon-Seob So

Mi-Suk Lee

Bong-Tae Kim

Seung-Min Choi

Jae-Chan Jeong

Jae-Il Cho

Jong-Hoon Park

Kyeong-Yeol Yu

Seon-Ja Kim

Jin-Sang Choi

An image-based hand detection apparatus includes a hand image detection unit for detecting a hand image corresponding to a shape of a hand clenched to form a fist from an image input. A feature point extraction unit extracts feature points from an area, having lower brightness than a reference value, in the detected hand image. An image rotation unit compares the feature points of the detected hand image with feature points of hand images stored in a hand image storage unit, and rotates the detected hand image or the stored hand images. A matching unit compares the detected hand image with the stored hand images and generates a result of the comparison. If at least one of the stored hand images is matched with the detected hand image, a hand shape recognition unit selects the at least one of the stored hand images as a matching hand image.

Image-based hand detection apparatus and method

A 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, encoding a difference between a baseband speech signal and a standard baseband between a synthesized standard baseband signal, and an IP network interface for multiplexing the coded standard and additional baseband signals and enhancement residual band signal.

System and method for transmitting and receiving wideband speech signals with a synthesized signal

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.

Transmitter and receiver for speech coding and decoding by using additional bit allocation method

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.

System and method for transmitting and receiving wideband speech signals

Disclosed is a communication terminal for a wire and wireless network phone which comprises: a communication service controller, including a RISC processor, for processing protocols that satisfy respective communication interfaces in hardware and software manners; a reset unit for applying a reset signal to be used for the communication service controller; a clock signal unit for supplying clock signals needed for the communication service controller; a memory connected to the communication service controller, for storing a start program, a terminal management program, user data, and various application programs; and an access unit for providing a VoIP telephone function, a DSL access function, an analog telephone function, an Ethernet access function, a wireless network access function, and an EIA232 access function.

Communication terminal for wire and wireless internet phone

A device and a method for estimating an open-loop pitch in a general speech CODEC are disclosed. The open-loop pitch estimation device includes an autocorrelation function calculation unit which calculates a normalized autocorrelation function from a perceptual weighing filtered speech signal, a maximum autocorrelation function and lag estimation unit which estimates a maximum autocorrelation function and candidates for the maximum autocorrelation function, a pitch candidate decision unit which decides candidates for a pitch by using the ratio of the estimated maximum autocorrelation function to the candidates for the estimated maximum autocorrelation function, and lags of which values are smaller than a predetermined threshold value, and a pitch estimation unit which estimates a pitch between the candidates for a pitch and the lags corresponding to the estimated maximum autocorrelation function by using a pitch of a previous frame of the speech signal.

Method of estimating pitch by using ratio of maximum peak to candidate for maximum of autocorrelation function and device using the method

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.

System-on-chip development apparatus for wire and wireless internet phone

An improved video window control apparatus and a method thereof which are capable of generating a plurality of video windows on a television or a computer monitor, controlling the size and position thereof, and providing a video window overlap function and a picture-in-picture function. The apparatus includes a video window flow control means for controlling the size based on an input control of a video window and a position and overlap of the video windows based on a video output control and for outputting a video windows input control signal, a video output control signal, and a video selection signal, a plurality of video memory means for receiving a video signal outputted from an external video input and processing means in accordance with the video input control signal and for limitedly outputting the video signals in accordance with a video output control signal, and a video combining means for combining the video signals from the video memory into one video signal in accordance with the video selection signal and for outputting the video signal to an external video output means.

Growing community of inventors

Daejeon, South Korea

Dae-Hwan Hwang