Sony Corporation

Hajime Nitta

Kiyoshi Ota

Masashi Ohta

Toshimichi Hamada

Daisuke Hiranaka

Nobuyuki Aoki

Akira Hasegawa

Keitaro Yamashita

Masatoshi Takashima

Koji Obata

Toshiyuki Ishii

Takehiko Saito

Tomihiro Nakagawa

Noriaki Oishi

Tomoyuki Sato

FIG.B shows buffer occupancy rate of a transport stream bufferwhen a TS packet is transferred to the transport stream bufferhaving a transport rate Rt and a leak rate Rx. A time Tduring which the buffer occupancy rate of the transport stream bufferincreases and a time Tduring which the buffer occupancy rate of the transport stream bufferdecreases are expressed by (Rt&#x2212;Rx)&#xd7;T=Rx&#xd7;Tand T=(188&#xd7;8)/Rt. A time T is T=T+T=(188&#xd7;8)/Rx. Therefore, the time T is equal to a time T' shown in FIG.C. Thus, when a TS packet is transferred in a cycle of the time T&#x2032;, the transport stream bufferwill not overflow and the transport stream bufferbecomes empty at least once a second, whereby simulation for the transport stream bufferis not required in the simulation for the T-STD model.

Data multiplexer, data multiplexing method, and recording medium

A recording/reproducing device has an NTSC decoder which receives a video signal and outputs a video signal, an MPEG audio encoder which receives an audio signal and outputs an audio signal, and a synchronous control circuit which detects a synchronizing signal from the video signal input to the NTSC decoder and uses that signal to generate an output synchronizing signal that is different from the input synchronizing signal. The output synchronizing signal is used to output the video signal from the NTSC decoder. In the recording/reproducing device, the NTSC decoder and the MPEG audio encoder provide a delay to the input video signal and audio signal, respectively, and output the video signal and audio signal in accordance with the output synchronizing signal generated by the synchronous control circuit.

Data processing device and data recording method

A system for recording an input video signal input to an A/D conversion processing section on a recording medium in accordance with a recording clock generated by a recording system synchronous control section, and for outputting the video signal recorded on the recording medium to outside in accordance with a reproducing system synchronous control section. When switching and outputting a recording video signal input to the A/D conversion processing section and a reproduction video signal recorded on the recording medium and then decoded and output by an MPEG AV decoder, the recording video signal is temporarily stored in a frame synchronizer, and the recording video signal stored in the frame synchronizer and the reproduction video signal decoded by the MPEG AV decoder are switched and output in accordance with a reproduction clock generated by the reproducing system synchronous control section.

Data recording/reproducing device

A system and method for performing high-speed reproduction of compressed video/audio data. High-speed reproduction is controlled such that only a portion of the data contained in each of the smallest possible data reproduction units is reproduced, and such that only the portion of the audio data which is contained in each of the smallest possible data reproduction units is reproduced.

Digital signal reproduction method and apparatus

A data reproducing method and apparatus for providing special reproductions such as a reverse reproduction quickly when it is specified. In the data reproducing apparatus comprising a demodulator for demodulating data read out of a digital video disk by a pickup, a buffer for temporarily storing the demodulated data and a decoder for decoding the data read out of the buffer into original video signals, further included is a control circuit for controlling the buffer so that an unread data area and an already-read data area in the buffer take about half of the total memory capacity, respectively. As a result, the data necessary for reverse reproduction or the like is present in the buffer, allowing the special reproduction to run quickly.

Reproduction of information using a ring buffer with read and write

A method and apparatus for reproducing data recorded in a sector basis from a recording medium. The data recorded in each sector may include audio and/or video data and the data of each sector may be arranged in one or more packets wherein each packet may include a packet start code and a stream identification code located at the beginning of the respective packet which may indicate whether audio or video data is included in the respective packet and/or the type of data included therein. Sector information associated with the sector is detected from the read data. Writing and reading operations of the data read from the recording medium into and from a memory are controlled based on the detected information. As a result, the time required to recover from the occurrence of an error may be reduced.

Method and apparatus for reproducing data recorded in a recording medium

Decoding data in a special mode is provided without frequent access to a disk. The reproduced data, corresponding to encoded video frames, is written to a storage memory during a normal mode. Attribute information is stored for each encoded video frame which includes the type of encoding for each encoded video frame and its position within the storage memory. In a special mode, encoded video frames are read from the storage memory in a special sequence. Encoded video frames needed to decode a respective encoded video frame are selectively read from the storage memory according to the attribute information. It becomes unnecessary in the present invention, therefore, to reproduce the data necessary for decoding during a special mode, thereby shortening access to the disk and smoothing reproduction of the encoded video frames during the special mode.

Data reproducing method and data reproducing apparatus

Data decoding decodes data reproduced from a record medium and stored in a memory. Since decoding requires a sufficient amount of data to be stored in memory especially when the data is, for example, predictively encoded, a system controller is provided which inhibits previously read data from being overwritten in memory. Thus, when a reverse reproduction operation is suddenly initiated during a forward reproduction operation, a sufficient amount of data is reserved in the memory for decoding the data in the reverse direction. Similarly, the system controller inhibits the memory from writing over previously read data during a reverse reproduction and a sufficient amount of data is reserved for decoding when forward reproduction is resumed.

Apparatus and method of decoding data groups of pictures

A method for transmitting index information in video tape recorders. During playback, index information which was recorded on a tape is retrieved. This index information is superimposed upon the vertical retrace blanking period of the video signal. transmitting said superimposed signal. When the superimposed signal is received, the index information is retrieved from the superimposed signal. The video signal is then recorded with the index information.

Method for transmitting index information in video tape recorder

In step S1, the capacity of the area (remaining quantity) of a disk in which information can be recorded is read, and the remaining quantity is displayed in step S2. After a user inputs the recording time of information to be recorded and the recording capacity w for the recording, an average transmission rate R.sub.1 is calculated from expression R.sub.1 =w/t-.alpha. in step S4. The rate .alpha. is the transmission rate for transmitting signals other than a video signal, such as an audio signal, attached to the video signal. Data obtained by applying a DCT treatment to the video data is quantized with a quantization width corresponding to the average transmission rate R.sub.1 and this data is intermittently recorded on the disk.

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Kanagawa, Japan

Hajime Nitta