Abstract: A system and a method of suppressing outstanding degradation of decoded audio quality due to a transmission error of audio coded data are provided without feedback information from a receiver, thereby reducing the increase of the number of necessary transmission bands and the arithmetic complexity on the receiving side. A code conversion and transmission apparatus 100 for inputting audio coded data includes first to N-th code conversion and transmission units 102 and 104 to 106 for converting audio data to N pieces of coded data, and transmitting the data at predetermined or adaptively variable time intervals to M transmission lines 130. The second to N-th audio code conversion and transmission units 104 to 106 codes a frame at a compression rate equal to or higher than the rate of input coded data.

Abstract: A cellular phone terminal 103 can be connected to both of a wireless cellular phone base station 104 that is a public network and a wireless LAN access pint 101 that is a private wireless network to be used by particular users. When the cellular phone terminal 103 enters a wireless area 102 of the private wireless network, the cellular phone terminal 103 activates at least one part of at least one data processing functions of an address book function 103a, a bookmark function 103b and a mailbox function 103c that handle private information for the cellular phone terminal 103. On the other hand, when the cellular phone terminal 103 moves outside the wireless LAN area 102 like a cellular phone terminal 106, at least one part of the function of the activated functions is non-activated or disabled. The activated/non-activated functions are differentiated depending on a plurality of the private wireless networks or the user of the cellular phone terminal.

Abstract: A system and a method of suppressing outstanding degradation of decoded audio quality due to a transmission error of audio coded data are provided without feedback information from a receiver, thereby reducing the increase of the number of necessary transmission bands and the arithmetic complexity on the receiving side. A code conversion and transmission apparatus 100 for inputting audio coded data includes first to N-th code conversion and transmission units 102 and 104 to 106 for converting audio data to N pieces of coded data, and transmitting the data at predetermined or adaptively variable time intervals to M transmission lines 130. The second to N-th audio code conversion and transmission units 104 to 106 codes a frame at a compression rate equal to or higher than the rate of input coded data.

Abstract: An audio communication device includes a plurality of encoding units and decoding units, and switches the encoding format from one to another according to the useable transmission band or to a user audio quality request or to a delay request. The audio encoded data that is received is decoded by selecting an optimal decoding unit according to the encoding format identifier added to the data or according to set information notified from audio communication device 201 of the communication partner. The audio data decoded is temporality stored in audio data buffer 216 and reproduced. The amount of audio data stored in the audio data buffer is controlled so that audio is reproduced without pause.

Abstract: Two-way communication apparatuses 101 and 103 communicating with each other via a transmission line 102 have an encoding part and a decoding part, and also has at least one of a combination of an interleaver and a de-interleaver and a combination of an error correcting encoding part and an error correcting decoding part. An interleave process unit, an order of an interleave process, an error correcting encoding method, an error generation code generation unit, an encoding rate, a frame rate, and a sampling frequency can be set to be asymmetric by transmitting and receiving. It is possible to achieve communication which accords with conditions of the transmission line 102 and user's demands for a delay and a quality.

Abstract: There are provided a system, an apparatus, and a method for suppressing increase in an amount of distribution data when performing content distribution via a network, improving reliability of the data received by a receiver in the distribution through an unstable transmission path such as a wireless transmission path, enabling provision of the content with a stable quality, and realizing the provision of the content with an optimal quality for the reception environment of content receiver, while suppressing an increase in an amount of processing for improving reliability of the distribution data on both of reception side and a transmission side.

Abstract: There are provided a content data transmission method, device, and program that minimize serious disturbances in reproduced content on the reception side, caused by a transmission error of encoded data, without sending feedback information from the reception side to the transmission side. When an encoder 103 creates encoded data to be distributed, the encoder creates plural items of encoded data at the same time or creates FEC data at the same time in advance and, when storing the data in a file 104, stores the data as if the data were one item of encoded data. When a distribution server 105 distributes the data using the file 104, the plurality of items of encoded data are automatically distributed at the same time and the FEC data is distributed. A client 106 receives the plurality of items of encoded data or the FEC data to reduce the probability of data shortage due to a packet loss and, as a result, the deterioration in the image quality and the audio quality is reduced.

Abstract: A system and a method of suppressing outstanding degradation of decoded audio quality due to a transmission error of audio coded data are provided without feedback information from a receiver, thereby reducing the increase of the number of necessary transmission bands and the arithmetic complexity on the receiving side. A code conversion and transmission apparatus 100 for inputting audio coded data includes first to N-th code conversion and transmission units 102 and 104 to 106 for converting audio data to N pieces of coded data, and transmitting the data at predetermined or adaptively variable time intervals to M transmission lines 130. The second to N-th audio code conversion and transmission units 104 to 106 codes a frame at a compression rate equal to or higher than the rate of input coded data.

Abstract: [Problems] To improve reliability of reception data and provide a content with a stable quality when content distribution is performed via a network. [Means for Solving Problems] A content distribution device (101) includes data output means (104) for outputting encoded data and transmission means (106 to 109) for transmitting encoded data which is outputted from the data output means (104) The data output means outputs encoded data obtained by hierarchical encoding as the encoded data. The transmission means transmits at least a part of data of at least one layer among the encoded data obtained by the hierarchical encoding.

Abstract: A media stream transmission apparatus for transmitting a plurality of media streams comprises a packet assembler for coupling a plurality of information units for transmitting the respective media streams into a single packet, and a multicast packet transmitter for multicasting the packet. A media stream reception apparatus is connected to the media stream transmission apparatus through a network having a multicast-capable router, and comprises a multicast packet receiver for receiving a multicast packet, an information element extractor for extracting one or plural information elements to be reproduced from the received packet, and a reproduction unit for reproducing the extracted information element or elements.

Abstract: A system and a method of suppressing outstanding degradation of decoded audio quality due to a transmission error of audio coded data are provided without feedback information from a receiver, thereby reducing the increase of the number of necessary transmission bands and the arithmetic complexity on the receiving side. A code conversion and transmission apparatus 100 for inputting audio coded data includes first to N-th code conversion and transmission units 102 and 104 to 106 for converting audio data to N pieces of coded data, and transmitting the data at predetermined or adaptively variable time intervals to M transmission lines 130. The second to N-th audio code conversion and transmission units 104 to 106 codes a frame at a compression rate equal to or higher than the rate of input coded data.

Abstract: In distributing moving image data, it is an object to make it possible to start reproduction, not only from the head of the moving image data, but also from any desired position and to minimize an increase in the amount of the processing. A moving image data conversion device (1) comprises moving image data receiving means (2) for receiving moving image data (6), decoder configuration information saving means (3) for retrieving and holding decoder configuration information included in the moving image data (6) to define a condition for decoding the moving image data (6), decoder configuration information inserting means (4) for inserting the decoder configuration information into a plurality of predetermined positions in the moving image data (6) to generate moving image data, and moving image data output means (5) for outputting the generated moving image data as moving image data (8).

Abstract: An image data distribution device (101) includes an image coded data 1 transmission unit (105), an image coded data 2 transmission unit (106), and a session management unit (103). A plurality of image coded data of the same image is distributed in different sessions or image data having different types of image frame and image block is distributed in different sessions. Here, for each session, the routing priority control is performed in the transmission path and power control is performed if the path is a radio transmission path. An image data reception device (108) includes an image coded data 1 reception unit (110), an image coded data 2 reception unit (111), a session information reception unit (109), a coded data reconstruction unit (112) for reconstructing the coded data, and a decoder (113). Among the image coded data normally received from at least one session, coded data is selected according to the image quality and decoded.

Abstract: An image data communication system that enables a suppression of the loss of data during a handover interval without entailing insufficiency of network resources includes: image data distribution device for sequentially distributing, with prescribed time differences, encoded image data 1 and 2 in which an identical image has been encoded; and image data reception device for receiving encoded image data 1 and 2 that have been distributed from image data distribution device while moving among a plurality of radio areas. Image data reception device, at the time of handover that occurs during movement from a current radio area to another neighboring radio area, receives over a prescribed interval encoded image data 1 and 2 having prescribed time differences that are distributed from image data distribution device, and selects necessary data from the encoded image data 1 and 2 that have been received to reconstruct one set of encoded image data.

Abstract: A media-encoded data transmission method for transmitting media-encoded data stored in a transmitted packet, using a protocol which can store the transmitted packet with an error detecting code calculated from data included in the transmitted packet, and with information for identifying a data portion used in the calculation of the error detecting code includes the steps of previously classifying each of data elements capable of composing a transmission packet into groups in accordance with the magnitude of influence exerted on the reproduction quality on the receiver side by an error associated with the data element, and determining, for each transmission packet, upon creation of each transmission packet for transmission, a data portion which includes all data elements that belong to largely affecting groups in accordance with a predetermined criterion and has the shortest data length, as a data portion for calculating the error detecting code.

Abstract: A system and a method of suppressing outstanding degradation of decoded audio quality due to a transmission error of audio coded data are provided without feedback information from a receiver, thereby reducing the increase of the number of necessary transmission bands and the arithmetic complexity on the receiving side. A code conversion and transmission apparatus 100 for inputting audio coded data includes first to N-th code conversion and transmission units 102 and 104 to 106 for converting audio data to N pieces of coded data, and transmitting the data at predetermined or adaptively variable time intervals to M transmission lines 130. The second to N-th audio code conversion and transmission units 104 to 106 codes a frame at a compression rate equal to or higher than the rate of input coded data.

Abstract: Disclosed are an apparatus and method that make possible high-speed mode selection using an evaluation standard of high encoding efficiency in intra prediction. The apparatus includes a first cost calculator for generating cost values from difference information indicative of differences between prediction signals, which have been generated by a prediction signal generator, and a moving picture signal that is input to a moving picture compression encoding apparatus; a preliminary selector for selecting at least two prediction modes based upon the cost values and outputting these prediction modes to a second cost calculator; the second cost calculator for frequency-converting the prediction modes that have been output from the preliminary selector and generating new cost values; and a prediction mode selector for selecting the optimum prediction mode based upon the cost values prevailing after the frequency conversion.

Abstract: A video data distribution device 101 multicast or broadcast distribute moving picture data of the same video, the same encoding method, the same frame configuration but having different compression ratios in at least one different session according to the compression ratio or the video frame and the video block type and controls to notify session information or confidential information on the distribution data to a receiver according to the video quality permitted for the receiver to receive. A video data reception device 108 uses the notified session information or the confidential information so as to select encoded data from the normally received encoded data from at least one session, according to the video quality, and decode it.

Abstract: A transit control apparatus connects a plurality of terminals participating in a multipoint conference to each other for relaying and controlling speech data. A terminal connected to the transit control apparatus transmits speech data. A DTMF signal extracting instruction decoder extracts a DTMF signal from the speech data transmitted from the terminal, and decodes the extracted DTMF signal into an instruction. A mixer adjusts the volume level of the speech data based on the instruction, and outputs the adjusted speech data.

Abstract: A system and a method of suppressing outstanding degradation of decoded audio quality due to a transmission error of audio coded data are provided without feedback information from a receiver, thereby reducing the increase of the number of necessary transmission bands and the arithmetic complexity on the receiving side. A code conversion and transmission apparatus 100 for inputting audio coded data includes first to N-th code conversion and transmission units 102 and 104 to 106 for converting audio data to N pieces of coded data, and transmitting the data at predetermined or adaptively variable time intervals to M transmission lines 130. The second to N-th audio code conversion and transmission units 104 to 106 codes a frame at a compression rate equal to or higher than the rate of input coded data.