Hitachi-kokusai Electric Inc.

Hitachi Denshi Kabushiki Kaisha

Hiroyuki Takesue

Atsushi Miyashita

Nobuo Tsukamoto

Tatsuhiro Nakada

Toshiyuki Akiyama

Seiichi Sano

Yoshikatsu Wagatsuma

Tatuhiro Nakada

Hisao Koda

Itsuo Ishida

A video switching device includes a video switching unit that has at least two video signal input units, and an encoding device. The video switching unit includes a first control detection unit that, on the basis of an externally inputted control signal, outputs a pre-control signal; a second control detection signal that, on the basis of the control signal, outputs a camera switching instruction signal for switching camera video signals during a vertical blanking interval; and a camera video switching unit that switches two video signals. The encoding device includes an encoding unit that encodes video signals; and a control unit that, by means of the pre-control signal, reduces the amount of code generated by the encoding unit.

Encoding device comprising video switching device, encoding method including video switching detection method

Problem: The purpose of the present invention is to improve the accuracy of detecting a motion involved in video signal encoding. Solution: This encoding device has a video signal input unit and a status information input unit for a camera angle and the zoom magnification of a lens, the encoding device being characterized in being provided with a control unit and an encoding unit, the encoding unit having an I processing unit, a P processing unit, a selection unit, a buffer memory unit, a decoding unit, a motion correlation unit, a weighting unit, and a determination unit, the weighting unit altering weighting in accordance with status information, the selection unit selecting one among the output of the I processing unit, the output of the P processing unit, and the output of the determination unit.

Encoding device and encoding method

A TMCC carrier is demodulated from a received OFDM signal having a TMCC carrier. A relative carrier position of the demodulated TMCC carrier is detected. A carrier shift amount is detected from the detected relative carrier position of the TMCC carrier and a normal TMCC carrier position. The received OFDM signal is corrected for the carrier frequency shift based on the detected carrier shift amount.

Method and detecting carrier shift amount in digital transmission signal, method of correcting carrier shift amount, and receiver employing these methods

A digital signal transmission system using a digital modulation system comprising a digital signal transmitter having a first digital signal processing unit and a digital signal receiver receiving a digital signal from the transmitter, wherein the digital signal receiver comprising a second digital signal processing unit for processing the digital signal from the transmitter and outputting a digital demodulated signal and a correlation value signal, a signal converter coupled with the second digital signal processing unit and supplied the correlation value signal therefrom for generating a waveform indicating a transmission condition including a main wave in response to the correlation value signal, and a display coupled with the signal converter for displaying the waveform indicating a transmission condition in the digital transmission system.

Digital signal transmission system and method of displaying transmission condition in digital signal transmission system

A data transmission system for transmitting data from a transmitter to a receiver located away therefrom. The transmitter includes circuitry for transmitting together a main signal having a carrier modulated with main data to be transmitted and as well as a sub-signal to be used in frequency conversion and generated by modulating a carrier of a predetermined frequency out of a frequency band of the main signal. The receiver includes circuitry for receiving a receive signal from the transmitter and extracting the sub-signal therefrom and also includes circuitry for generating a signal to be used as a reference at the time of converting the receive signal to a signal having a predetermined frequency on the basis of the extracted sub-signal.

Data transmission system, data transmission communication station, and data transmission method

A receiving apparatus and a receiving method for receiving a signal modulated by a multi-carrier modulation scheme for transmitting the information code using a plurality of carriers. The signal contains data carriers and regularly-inserted pilot carriers fixed in amplitude and phase. The cross-correlation between the received signals with the data carriers distant to such an extent as to eliminate the correlation with each other is calculated, and based on the result of the cross-correlating operation by the correlating operation unit, the signal correlation component as related to the pilot carriers is extracted.

Apparatus and method for receiving signals including data carriers and pilot carriers modulated by multi-carrier modulation method

A communication method in an orthogonal frequency division multiplexing modulation communication system includes a transmission apparatus in which a frequency bandwidth of a signal modulated in accordance with an orthogonal frequency division multiplexing modulation system is changed and the modulated signal is transmitted and a receiving apparatus in which the modulated signal is received and a frequency bandwidth for demodulation of the received signal is changed to follow the change of the frequency bandwidth of the modulated signal.

Growing community of inventors

Kodaira, Japan

Hiroyuki Takesue