Sharp Kabushiki Kaisha Corporation

Nippon Telegraph and Telephone Corporation

Sharp K.k.

Other

Jiro Nakabayashi

Tsuneaki Iwano

Takashi Oshima

Keiichi Hibi

Tsuneko Kura

Youji Kanada

Osamu Nakamura

Hirotaka Nakano

Nobuyuki Ema

Tadashi Uchiumi

Osamu Hakamura

Masahiro Shioi

Takeshi Makiyama

Toshihiro Uota

Manabu Omori

Tadashi Uchimi

Packets received through a network interfaceis stored into a receiving buffer. Are production controllerchecks the current state of receiving bufferand performs a reproduction process mentioned below. The data in receiving bufferis transferred to a decoderin accordance with instruction from reproduction controllerand decoded as voice sound, D/A converted by a D/A converterand then output as voice sound from a speaker. The clock for D/A conversion is supplied from a reproduction clock CLK. This configuration is free from overflow and underflow of the receiving buffer due to difference in clocks between the transmitting and receiving ends, and prevents the occurrence of packet jitter so as to avoid voice sound breaks.

Apparatus for processing packet, and medium storing packet processing program

A wireless communication circuit in accordance with the present invention, is the wireless communication circuit having an amplifier for amplifying a signal, includes an amplification route in which the signal passes through the amplifier; a bypass route for bypassing the amplifier; and a route-selector for selecting one of the amplification route and the bypass route. This arrangement prevents an amplification of a signal, being transmitted or being received, when a communication counterpart is in a close distance, thereby reducing an unnecessary power consumption.

Wireless communication circuit, wireless communication apparatus, and wireless communication system

A device which is capable of storing moving picture data received from each terminal and providing each terminal with video information to be reproducible by rapidly forwarding or reversing at any desired speed independent of usable terminals. A video storage type communication devicewith a receiving portionand a transmitting portiontransmits and receives video data over a communication networkto and from each terminaln. A coded video data received from terminalsn is stored as it is in a first storage portionand, at the same time, the data converted into specially reproducible video information is stored in the second storage portionAt the time of reproducing, the reproduction control portioncontrols the reproduction selector switchto obtain the video data from the first storage portionor the second storage portionchanging the reproduction mode from ordinary to the rapid forwarding/reversing and vice versa. The specially reproducible video generating portionsuccessively restores coded video data received through the receiving portionencodes again the restored data by intraframe, interframe or still-picture coding method to generate video information to be reproducible in special mode such as reproduction by rapid forwarding or reversing.

Video storage type communication device

A device which is capable of storing moving picture data received from each terminal and providing each terminal with video information to be reproducible by rapidly forwarding or reversing at any desired speed independent of usable terminals. A video storage type communication device with a receiving portion and a transmitting portion transmits and receives video data over a communication network to and from each terminal -n. A coded video data received from terminals -n is stored as it is in a first storage portion and, at the same time, the data converted into specially reproducible video information is stored in the second storage portion At the time of reproducing, the reproduction control portion controls the reproduction selector switch to obtain the video data from the first storage portion or the second storage portion changing the reproduction mode from ordinary to the rapid forwarding/reversing and vice versa. The specially reproducible video generating portion successively restores coded video data received through the receiving portion encodes again the restored data by intraframe, interframe or still-picture coding method to generate video information to be reproducible in special mode such as reproduction by rapid forwarding or reversing.

A device which is capable of storing moving picture data received from each terminal and providing each terminal with video information to be reproducible by rapidly forwarding or reversing at any desired speed independent of usable terminals. A video storage type communication device 30 with a receiving portion 35 and a transmitting portion 38 transmits and receives video data over a communication network 10 to and from each terminal l-n. A coded video data received from terminals l-n is stored as it is in a first storage portion 32 and, at the same time, the data converted into specially reproducible video information is stored in the second storage portion 33. At the time of reproducing, the reproduction control portion 35 controls the reproduction selector switch 36 to obtain the video data from the first storage portion 32 or the second storage portion 33, changing the reproduction mode from ordinary to the rapid forwarding/reversing and vice versa. The specially reproducible video generating portion 34 successively restores coded video data received through the receiving portion 31, encodes again the restored data by intraframe, interframe or still-picture coding method to generate video information to be reproducible in special mode such as reproduction by rapid forwarding or reversing.

Video storage type communication device for selectively providing coded

If received coded video-data includes data with an error unable to be decoded or data disagreeing with ITU-T recommendation H.261 (e.g., the number of bits per frame exceeds the limit defined by the recommendation), it must be stored with due countermeasures taken against error and inadaptable data, which allows the stored data to be effectively reproduced. Received coded video-data is decoded by a transmission-line decoding portion and divided into frames by a data dividing portion. Thereafter it is decoded by an information-source decoding portion and then intraframely encoded by a intraframe coding portion. According to a signal from a bit-counting portion showing that the number of bits in one frame of coded video-data exceeds the limit defined by ITU-T recommendation H.261 or anomalous signal of a frame image decoded by the information source decoding portion, a frame-processing control portion decides how to store each frame and controls a storable data transfer portion to select intraframe-coded data and transfer the selected data to a data storage.

Video data storing device and method for coding video data based upon

A video storage type communication device stores video data received from a terminal and reproduces required video information by rapid forwarding or reversing at any desired frame rate at the terminal independent of the terminal specification. A video storage type communication device includes a transmitting portion for transmitting video data and a receiving portion for receiving video data over a communication line. A video storage portion stores received video data. A communication control portion carries out video communication by controlling the above-mentioned portions. A refresh image detecting portion judges, from the received video data, whether the received video data is a refresh image. A storage control portion adds inter-frame or intra-frame prediction coded information to the received video data in accordance with the determination by the refresh image detecting portion and stores the received video data in the video storage portion. A terminal control portion sends at a desired interval a request for updating a display image through the communication control portion to a terminal during storing of video information.

A connection control equipment can connect a plurality of calls originating from a terminal to a private side terminal by identifying the calling terminal. Each of the user terminals sets a calling number and a calling sub-address or a user-to-user information for identifying the terminal in a call-setting message. A switching system of the connection control equipment receives the call-setting message and stores the calling number and the calling sub-address or the user-to-user information of the message, and connects the call to a private side terminal with which the same user terminal issuing the just received call is communicating. The switching system can connect calls from the same user terminal to the same private terminal, allowing for any user terminal to freely transmit a plurality of calls without considering how to access a host computer.

Dual channel ISDN terminal call identification and switching system

The purpose of the invention is to provide a system capable of easily reproducing an image from interframe predictive signals conventionally used for, e.g., visual telephone communications. Video and audio signals multiplexed by first separating and multiplexing device are assembled into packets proportional to a bit rate of the multiplexed data by a packet separating-multiplexing device and completed with information on the multiplexing conditions, i.e., packet structure. The packets are then stored and when the stored packets are reproduced, the packet separating-multiplexing device judges the structure of the packet according to the information of the multiplexing conditions and disassembles the packets into individual data and decodes the video and sound signals.

Growing community of inventors

Urawa, Japan

Jiro Nakabayashi