Mitsubishi Denki Kabushiki Kaisha

Mitsubishi Electric Corporation

Kenji Tsunashima

Yoshinori Asamura

Tomohiro Ueda

Takashi Itow

Satoshi Kurahashi

Tetsuro Shida

Toshifumi Fujii

Hideaki Kosaka

Hideki Kawano

Ikuo Ookuma

Yoshiyuki Sasaki

A broadcast receiving device includes: a display control unit for causing a display unit to display a video based on received data; an input unit, through which information input operation is performed; a first network communication unit communicably connected to a wide area network; a second network communication unit communicably connected to an information processing device; a network bridge processing unit for creating a bridge connection between the first network communication unit and the second network communication unit to make possible communication between the information processing device and the wide area network; and a user interface providing unit for receiving graphical user interface generated by the information processing device via the second network communication unit and supplying graphics data based on the graphical user interface to the display control unit, the user interface providing unit supplying information inputted from the input unit to the information processing device via the second network communication unit.

Broadcast receiving device and broadcast receiving system

Even when a communication state between a tuner device and a display device is deteriorated, a television broadcast receiving device enables a user to view broadcast. The television broadcast receiving device of the present invention has a tuner section that receives a digital broadcast signal, selects the digital broadcast signal to decode the digital broadcast signal, generates video data including a video signal and an audio signal, and converts the video data into processed video data suitable for wireless communication, and a display section that receives the processed video data from the tuner section through wireless communication, and displays a video based on the processed video data. The tuner section has a recording/playback section that records and reads the video data in and from a predetermined recording section according to a change in state of the communication with the display section.

Television broadcast receiving device

An MPEG data recorder comprises an interface means for receiving a data packet from a digital transmission line transmitting MPEG data in real time, and extracting a predetermined MPEG data from a received packet to output it as a data signal; a data rate detector means for determining a data rate of MPEG data based on a valid data period, during which the data signal is outputted from the interface means; and a recording mode selector means for selecting a recording mode based on the determined data rate. According to such a configuration, the data rate of MPEG data can be detected without a necessity of analyzing the MPEG data, which would require an MPEG system layer decoder, and thereby an MPEG data recorder can be obtained, in which MPEG data are recorded efficiently in a proper recording mode, with a simplified circuit configuration.

MPEG data recorder including an MPEG data rate detector

When a digital video signal is compressed, the amount of resulting data is predicted and the quantization level is controlled so as to obtain a constant bit rate. The prediction is made by computing a linear combination of a standard deviation and a number of non-zero coefficients, or by computing a sum of absolute differences between adjacent pixel values, or by computing a dynamic range of pixel values. The bit rate can also be controlled by deleting high-frequency coefficients. To avoid image degradation, the quantization level can also be controlled according to the sensitivity of small image areas to quantization noise. Sensitivity is determined by dividing an area into subblocks, which may overlap, and calculating statistics in each subblock. To reduce the amount of computation required in motion estimation, chrominance motion vectors are derived from luminance motion vectors.

Variable length coding of video with controlled deletion of codewords

Video encoder and encoding method using intercomparisons of pixel values

Video encoder using adjacent pixel difference for quantizer control

A time axis correcting device for removing change in time axis in an input video signal includes a video signal memory unit; a write-in control unit operable in response to a sampling command signal to write the input video signal in the video signal memory unit at a write-in timing conforming to the change in time axis in the input video signal; a read-out control unit for reading out the video signal from the video signal memory unit at a predetermined read-out timing; a read-only memory for storing a sampling data of a sine wave; a reference signal sampling circuit for sampling the reference signal from the input video signal; an address control unit for calculating the difference in phase between a sampling point and a reference position for the sampling point according to a sampling value of the reference signal sampled from the input video signal and also for addressing the read-only memory according to the difference in phase to cause the read-only memory to output a corrected reference signal; and a signal converter for converting the corrected reference signal into the sampling command signal.

Time axis correcting device

A characteristics corrector in a video signal processing system is described for correcting characteristics of the video signal processing system at the time of recording and/or reproducing a video signal. The corrector includes a reference pulse generating circuit for generating reference pulses of varying amplitude corresponding to gradations from a black level to a white level of a video signal to be recorded during a blanking period of the video signal to be recorded. It further includes a pulse amplitude data generating circuit for generating quantified data used for the discrimination of the amplitudes of the reference pulses. Also, a reference data interleaving circuit is included for interleaving, as a reference data, the reference pulses and pulse amplitude data indicative of the amplitudes thereof during the blanking period. Finally, a level correcting circuit is included for correcting the level of a reproduced video signal by the utilization of a plurality of reference pulses and pulse amplitude data obtained from the reproduced video signal.

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Nagaokakyo, Japan

Kenji Tsunashima