JP3039666B2 - Recording device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a recording device, for example, a recording device in which transmission information is given as a packet.

[Prior art] In recent years, HDTV, which has become widespread, has a large number of scanning lines, and the image is dense and has very few flickers. Expected still image broadcasting has already been proposed.

In such a still image broadcast, information to be transmitted is given as a packet.

[Problems to be Solved by the Invention] However, when recording the still image broadcast, it is not efficient to record all the packets transmitted in real time. That is, in the case of a program configuration in which the screen does not change for a while after a single still image is transmitted, or in the case of a high compression ratio, many empty packets (invalid packets that are neither image data, control data nor audio data) Since recording is performed, the capacity of a recording medium (for example, a disk) cannot be used efficiently, and the number of programs that can be recorded is reduced.

An object of the present invention is to provide a recording device and a reproducing device that solve such a problem.

[Means for Solving the Problems] The recording apparatus of the present invention, when recording information given as a packet for solving the above-mentioned problems, includes an identification unit for identifying an empty packet, and an empty unit identified by the identification unit. Means for removing and recording a packet, wherein the recording means adds information indicating the number of empty packets removed between valid packets to the valid packet and records the packet.

Embodiment An apparatus according to an embodiment of the present invention will be described below with reference to the drawings.

FIG. 2 shows a case in which a disc is used as an example of recording and reproducing a still image broadcast program. In FIG. 2, reference numeral 101 denotes a packet input terminal of a still image broadcast, to which packet data received and demodulated by a receiver (not shown) is input. 103 is a DSP (Dig
104, a buffer; 105, a personal computer for writing, reading control and searching to and from the disk 107; 106, a disk driver for processing necessary for recording and reproducing on the disk 107, such as adding an error correction code ,
Performs data scrambling. 107 is the disk body, A
Is an extension bus which is an address bus, a data bus and a control bus. Reference numeral 109 denotes an output terminal for outputting reproduced packet data from the disk 107 to a receiver (not shown).

The still image broadcast packet input from input terminal 101 is D
At SP103, SYNC, ID, etc. are detected, synchronized, and sent to the extension bus A via the buffer as recording data. The recording data sent to the extension bus A is processed by the personal computer 105 as recording data, and is recorded on the disk 107 via the disk driver 106.

At the time of reproduction, reproduction data is read from the disk 107 to the extension bus A via the disk driver 106. The playback data read out to the extension bus A is sent to the SDP via the buffer 104.
Sent to the output terminal 103 and output as a still image broadcast packet.
Output. Further, the personal computer 105 controls the recording and reproduction through the extension bus A.

In the broadcast program of the still image, the still image is compressed according to the transmission path, SYNC, ID and the like are added, and transmitted as a packet. FIG. 3 shows the packet format. The header of SI1 and SI2 is attached before the packet data part. The SI1 header contains SYNC and the like, and the SI2 header contains ID information indicating whether the packet is image data, control data for program configuration, or audio data. The data section contains encoded image data or control data, or audio data and an error correction code.

Next, FIG. 1 shows an apparatus in which the functions of the DSP 103 shown in FIG. 2 are divided into blocks.

In FIG. 1, reference numeral 102 denotes a circuit for identifying empty packets of a still picture broadcast, and reference numeral 108 denotes a circuit for inserting empty packets during reproduction.

Although such a circuit may be performed as processing of the DSP 103, the first
In the figure, it is shown as a circuit different from the DSP103.

The empty packet identification circuit 102 reads an SI2 header from a still image broadcast packet input from the input terminal 101,
An invalid packet (empty packet) that is neither image data, control data, nor audio data is recognized. Then, how many empty packets come after the valid packet Q is counted, and information of the number n of empty packets is added to the valid packet Q and sent to the DSP 103, and no empty packet is sent. The processing after the DSP 103 is the same as described above, but only the recording data consisting of information on the number of valid packets and empty packets is written on the disk 107.

At the time of reproduction, the recorded data is read out to the DSP 103 in the same manner as described with reference to FIG. Next, based on information on the number of empty packets reproduced by the empty packet insertion circuit 108, n empty packets are inserted after the valid packet Q, a header is added, and an output terminal is added.
Send to 109.

By doing so, the capacity of the recording medium can be used efficiently, and the recording time (the number of programs) can be increased.

Alternatively, the empty packet identification circuit 102 may identify the empty packet by adding ID information indicating that the packet is an empty packet to the SI2 header in advance.

In this embodiment, a disk-shaped recording medium is used as a recording medium. However, the recording medium is not limited to this, and may be other various media, for example, a tape-shaped or solid-state memory.

Further, in this embodiment, the information given as the still image broadcast is the information to be recorded or reproduced. However, the present invention is not limited to this, and may be various other data such as audio and other video information.

Further, the present invention is particularly effective in a data communication method in which a data rate to be transmitted is predetermined such as a broadcast.

In this embodiment, an example in which recording and reproduction are performed on a recording medium has been described.

[Effects of the Invention] As described above, at the time of recording, empty packets are identified, empty packets are removed, and information indicating the number of removed packets between valid packets is added to the valid packets and recorded. As a result, the number of packets to be recorded can be minimized, the capacity of the recording medium can be used efficiently, and the recording time (the number of programs) can be increased.

BRIEF DESCRIPTION OF THE DRAWINGS FIGS. 1 and 2 are block diagrams of an embodiment of the present invention. FIG. 3 is a diagram showing a packet format. 103 is a DSP 104 is a buffer 105 is a personal computer 106 is a disk driver 107 is a disk body A is an expansion bus.

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Ikuo Watanabe 3-30-2 Shimomaruko, Ota-ku, Tokyo Canon Inc. (72) Inventor Nobutsu Yamashita 3-30-2 Shimomaruko, Ota-ku, Tokyo Within Canon Inc. (56) References JP-A-58-1810 (JP, A)

Claims (2)

(57) [Claims] When recording information given as a packet, there is provided identification means for identifying an empty packet, and means for removing and recording the empty packet identified by the identification means, wherein the recording means comprises: A recording apparatus, wherein information indicating the number of empty packets removed between valid packets is added to the valid packets and recorded. 2. The reproducing apparatus according to claim 1, wherein at the time of reproduction, information indicating the number of empty packets is detected, and empty packets of a number corresponding to the data are inserted between the valid packets. The recording device as described in the above.