Kddi Corporation

Kddi R&d Laboratories, Inc.

Satoshi Miyaji

Yasuhiro Takishima

Yasuyuki Nakajima

Tomohiro Tsuji

Re-encoding information indicating whether or not an input moving picture has been compression-encoded is provided to a mode determining unit. The mode determining unit determines an optimal encoding mode for the input moving picture, out of a plurality of encoding modes. The mode determining operation is controlled by the re-encoding information. According to a mode determination result of the mode determining unit, a prediction error value corresponding to the determined mode is selected by a selection switch, and then, an encoding process is performed. As the re-encoding information, a pre-determined value, a bit rate, and a quantization parameter, etc., could be provided.

Moving-picture compression-encoding apparatus

A first buffer analyzer receives attribute information (a) of a video signal (A) from a stream buffer (A) to determine an encoded picture type after correction and a generated encoding amount after correction for a switch terminating measure. A second buffer analyzer receives attribute information (b) of a video signal (B) and final buffer-state information after the switch terminating measure from a stream buffer (B) to determine an encoded picture type after correction and a generated encoding amount after correction for a switch starting measure. A re-encoder/re-quantizer (A) and a re-encoder/re-quantizer (B) perform the switch terminating measure and the switch starting measure on the video signals (A) and (B), respectively, based on the correction information from the first and second buffer analyzers.

Video-signal switching apparatus

The present invention improves the encoding efficiency, image quality, resolution, and the like of an input image having a special property, for example, an image input from a special camera. The input image is sliced according to a recognized shape and divided into blocks having a size according to a pixel density or an image resolution. Then, an object in the image is defined using a parameter including the numbers of the sliced images and the amounts of shift of the sliced images from a reference position, and the respective blocks are encoded using the movement of the object. Further, when a partial image is cut out from a base image, encoded, and then transmitted, a processing load in the encoding processing is reduced by encoding the partial image making use of preprocessing data.

Adaptable shape image encoding apparatus and decoding apparatus

A transmitting device includes a first buffer for temporarily storing audio data, a second buffer for temporarily storing video data, a multiplexing unit for outputting audio data coming from the first buffer and video data coming from the second buffer onto a single signal channel, and a transmission buffer monitoring unit for monitoring the amount of first buffered data stored in the first buffer and, if the amount of the first buffered data exceeds a first threshold, instructing the second buffer to discard video data.

Transmitting device with discard control of specific media data

An audio playback apparatus includes a playback section for playing audio back, a buffer section () for temporarily storing voice data to be played back, a switch () for on/off switching transmission of the voice data from the buffer section () to the playback section, at least one threshold judgment section () for judging whether an amount of voice data buffered in the buffer section () is equal to or smaller than at least one threshold value, the at least one threshold judgment section () providing a true output when the buffered voice data amount is equal to or smaller than the at least one threshold value, a timer () triggered by an output from the at least one threshold judgment section to output a trigger pulse with a predetermined duration of time, and a first control section () for controlling on/off of the switch () to prevent transmission of the voice data in the buffer section () to the playback section for the predetermined duration of time of the trigger pulse when the true output is provided from the at least one threshold judgment section ().

Audio playback apparatus for controlling pause and resume of audio

It is made possible to concretely estimate actual transmission bit rate in a frame of grasping a line state by using a report packet. Together with media packets encoded by a video encoderand an audio encoder, a sender report packet generated by a sender report generation sectionis sent to the transmission line. A receiver report packet is fed back from the receiver side. Each of the sender report packet and the receiver report packet includes report packets of two kinds differing in size. A rate estimation sectionestimates transmission bit rate on the basis of round-trip delay time for the sender report packet and the receiver report packet each having a small size and round-trip delay time for the sender report packet and the receiver report packet each having a large size.

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Saitama, Japan

Satoshi Miyaji