Nec Corporation

Mitsumasa Tanaka

Hideki Sawada

Masaru Terashima

Takashi Sameshima

Takashi Samejima

An image editing apparatus which edits image data coded by an MPEG method includes an image encoder which codes the image data, an image decoder which decodes the coded image data, and an image data analyzer which determines an attribute of each GOP and a type of each image frame. The image data analyzer determines whether a head GOP of an area to be edited is a closed GOP or not. In a case where the image data analyzer determines that the head GOP is not a closed GOP, the image encoder converts a portion near the head of the area to be edited into a closed GOP.

Image editing apparatus and image editing method

In an audio-video synchronous playback control system which outputs coded audio data to an external audio decoding device so as to be decoded and played back by the external audio decoding device while playing back video data maintaining synchronization with the audio data playback of the external audio decoding device, an audio information analysis section figures out the size of one unit of the coded audio data and the size of audio data which is obtained by decoding the one unit of the coded audio data. A silent data generation section generates silent data of a size corresponding to the size of audio data. The video data playback of the video decoding/output section is controlled based on the amount of the silent data which are played back or processed by the audio output section.

System, method and record medium for audio-video synchronous playback

A method and system for installing a software product to computer with authorization is provided. (1) A code C is generated from registration information that designates information about software products having already been installed to a first computer and an identifier that designates the software product S on both the first and the second computer. (2) A second computer compares the code C generated by the first computer with the code C generated by the second computer. And (3) if the code C coincides with the code C , the software product S is installed to the first computer.

Method and system for installing a software product to a computer with authorization

An apparatus for synchronously reproducing a video data and audio data includes a separating section, an audio data processing section, a video data processing section, and a synchronization processing section. The separating section separates a multiplexed compressed audio and video data into a compressed video data and a compressed audio data. The audio data processing section expands the compressed audio data to reproduce an audio data from the expanded audio data, and outputs the audio data to the synchronization processing section. The video data processing section expands the compressed video data in response to a control signal to reproduce a video data from the expanded video data, and outputs a signal indicative of each of frames, and a signal indicative of each of time stamps to the synchronization processing section. The synchronization processing section calculates a frame rate based on the audio data supplied from the audio data processing section, and the frame signal and the time stamp signal supplied from the video data processing section, and outputs the control signal to the video data processing section based on the calculated frame rate without using a frame rate written in the video data.

Method and apparatus for synchronously reproducing audio data and video data

To provide an apparatus for a synchronized playback of compressed digital data of audio-video signals with a simple configuration to be applied to a system having comparatively low data processing ability, independent of resolution of a software timer of the system, the apparatus of the invention obtains a reference time indicating reproduction time passage of the audio signal component from reproduced data amount of the audio signal component, and detects progress of the video signal component in reference to the reference time.

Apparatus for a synchronized playback of audio-video signals

An apparatus for producing synchronized playback of compressed digital data of audio-video signals from a desired portion of the digital data. The apparatus can be used in a system having comparatively low data processing ability, and work independent of the resolution of a software timer of the system. The apparatus comprises a frame counter for obtaining a reference time indicating reproduction time passage of the audio signal component from a reproduced data amount of the audio signal component. A delay detector detects progress of the video signal component in reference to the reference time.

Apparatus for synchronized playback of audio-video signals

The audio-video synchronous playback apparatus of the present invention for expanding digital compressed audio data and digital compressed video data, respectively, and for synchronously playing back expanded audio data and expanded video data, comprises: an element for obtaining an audio playback time based on the amount of the played-back audio data; a means for determining progress in expanding the video data based on the audio playback time; and a recovery element for saving the processing time for the audio data and assigning a saved time to a process for the video data so as to recover any delay in a video portion when the expansion process for the video data is delayed with respect to the expansion process for the audio data.

Audio-video synchronous playback apparatus

To provide an apparatus for a synchronized playback of com- pressed digital data of audio-video signals adequately even when there are data errors with a simple configuration to be applied to a system having comparatively low data processing ability, independent of resolution of a software timer of the system, the apparatus obtains a reference time indicating production time passage of the audio signal component from reproduced data amount added with rejected error data amount of the audio signal component, and detects progress of the video signal component in reference to the reference time considering rejected error video data amount.

An image and sound synchronizing reproduction apparatus includes a reference time calculation circuit for calculating a reference time in response to a data amount of decoded sound data, a delay detecting circuit calculating number of image frames to be processed practically in the decoding process in response to the reference time and comparing the number of image frames with number of frames practically processed in the decoding process, for detecting a delay of image decoding process, a frame-removing control circuit for performing a discriminating process of frames to be omitted the decoding process in response to the number of delay frames detected by the delay detecting circuit, and an image data input control circuit for performing an omission to read compressed image data corresponding to the frames discriminated by the frame-removing control circuit, controlling finely the image and sound synchronizing reproduction regardless of the structure of compressing coded data.

Image and sound synchronizing reproduction apparatus and method of the

In a multi-media data communication system, there are in a server a plurality of user graphic interface (GUI) structures which are different in metaphor image from each other but function to provide the same service. A service request including a metaphor designating data for designating a specific one of the plurality of GUI structures and a terminal identifier of a request issuing terminal equipment of a plurality of terminal equipments is issued from the request issuing terminal equipment to the server via a bidirectional communication line. The server determines whether the request issuing terminal equipment is allowed to receive a service and whether the service request includes the metaphor designating data when it is determined that the request issuing terminal equipment is allowed to receive service. When the service request includes the metaphor designating data, the server transmits the specific one of the plurality of GUI structures to the request issuing terminal equipment in response to the service request. The request issuing terminal equipment designates a specific service using the transmitted GUI structure transmitted from the server and the server provides the specific service designated based on the transmitted GUI structure by the request issuing terminal equipment. In this manner, the request issuing terminal equipment can receives the specific service from the server.

Multi-media data communication system having a plurality of types of

In order to serve, to each of client terminals, programs and data most suitable for performance of the terminal, a server station of a mul-timedia communication system of the invention sends a check program before delivering data called from the client terminal. The terminal performs certain calculations and graphic display according to the check program and reports times needed for the check program to the server station. The server station selects programs and data most suitable for the terminal, enabling the terminal to enjoy its high performance.

Multimedia communication system

The invention provides a code amount controlling method wherein, when code amount control is performed in units of a GOP, data do not remain in a buffer even if data with which a moving picture comes to an end intermediately of the last GOP are compressed. A control parameter setting section gets the number of frames from among all frames of picture data of an object of compression for which coding processing has not been performed, gets the number of frames in one GOP, and discriminates from the remaining frame number and the frame number in the GOP whether or not coding processing comes to an end intermediately of the last GOP. When coding processing comes to an end intermediately of the last GOP, the last GOP and a directly preceding GOP are coupled to vary the frame structure, and an aimed code amount is calculated. Also another method wherein an aimed code amount of the last GOP is compulsorily determined making use of an aimed code amount of the preceding GOP may be utilized. Using the thus obtained aimed code amount, a Q-scale of the macroblocks is calculated and compression coding is performed.

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Tokyo, Japan

Mitsumasa Tanaka