JPH03235589A - Recorder and reproducer - Google Patents

Abstract

PURPOSE:To increase a recording time (number of programs) by providing a means identifying an idle packet and a means eliminating an identified idle packet and recording the result. CONSTITUTION:An idle packet identification circuit 102 reads a header SI 2 from a packet of a still picture broadcast inputted from an input terminal 101 to recognize an invalid packet (idle packet) not being a picture data, a control data, and an audio data. How many idle packets come next to a valid packet Q are counted and the information representing number (n) of idle packets is added to the valid packet Q and the result is sent to a DSP(Digital Signal Processor) 103 and no idle packet is sent. Only the recording data comprising information representing number of valid packets and idle packets is written on a disk 107. Thus, the capacity of the recording medium is used efficiently and it is possible to increase the recordable time (number of programs).

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a recording device and a reproducing device, for example, a recording device and a reproducing device in which transmission information is provided as a packet.

[Prior Art] HDTVs, which have become popular in recent years, have a large number of scanning lines, are m-density images, and have extremely little flickering, so they can be used as still images for art such as paintings and animation. It is expected to be used in fields such as medicine and product catalogs, and still image broadcasting has already been proposed.

In such still image broadcasting, the information to be transmitted is given as packets.

[Problem to be solved by the invention] However, when trying to record the above-mentioned still image broadcast,
It is not efficient to record all packets sent in real time. In other words, if the program structure is such that the screen does not change for a while after a single still image is sent, or if the compression ratio is high, empty packets (invalid packets that are not image data, control data, or voice data) are This results in a problem in that the capacity of the recording medium (for example, a disc) 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 this problem.

[Means for Solving the Problems] In order to solve the above-mentioned problems, the recording device of the present invention includes means for identifying empty packets and removing empty packets identified by the means when recording information given as a packet. and means for recording.

Further, the playback device of the present invention is characterized in that it has a means for inserting in order to solve the above-mentioned problem.

[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 where a disk is used as an example of recording and reproducing a still image broadcast program. In FIG. 2, 101 is a packet input terminal for still image broadcasting, which is received by a receiver (not shown) and demodulated packet data is input manually.

103 is a DSP (Di
digital signal processor),
104 is a buffer; 105 is a personal computer for controlling writing and reading from the disk 107; and 106 is a disk driver, which performs processing necessary for recording and reproducing the disk 107, such as adding error correction codes and scrambling data. conduct. 107 is a disk main body, and A is an expansion bus that is an address bus, a data bus, and a control bus. 109 is a pressure terminal for outputting reproduced packet data from the disk 107 to a receiver (not shown).

Still image broadcast packets inputted from the input terminal 101 are detected by the DSP 103 for 5YNC, ID, etc., synchronized, and sent to the expansion bus A as recording data via a buffer. The recording data sent to the expansion bus A is processed as recording data by the personal computer 105 and recorded on the disk 107 via the disk driver 106.

During playback, from disk 107 to disk driver 106
The playback data is read out to the expansion bus A via the expansion bus A. Expansion bus A1. :The read playback data is stored in the buffer 104.
is sent to the 5DP 103 via the 5DP, and output from the output terminal 109 as a still image broadcast packet. Furthermore, the personal computer 105 controls the recording and reproduction described above through the expansion bus A.

In the broadcast program using still images, the still images are compressed according to the transmission path, added with 5YNC, ID, etc., and transmitted as packets. Figure 3 shows the packet format. There are Sll and SI2 tabs in front of the packet data section.

The SII header contains 5YNC, etc., and the SI2 header contains ID information indicating whether the packet is image data, control data for program composition, or audio data. . The data portion contains encoded image data, control data, or audio data and error correction codes.

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, 102 is a circuit for identifying empty packets in still image broadcasting, and 108 is a circuit for inserting empty packets during playback.

Although such a circuit may be performed as a process of the DSP 103, it is shown as a circuit separate from the DSP 103 in FIG.

The empty packet identification circuit 102 reads the SI2 header from the bucket of still image broadcasting input from the input terminal 101, and identifies invalid packets (empty packets) that are neither image data nor control data nor audio data. recognize. And how many empty pegs are next to the valid packet Q?
information about the number of empty packets is added to the valid packet Q and sent to the DSP 103, and no empty packets are sent. The IA process after the DSP 103 is the same as described above, but only recording data consisting of information on the number of valid packets and empty packets is written to the disk 107.

During playback, the DSP 103
Read recorded data up to. Next, empty packet insertion circuit 1
Based on the information on the number of empty /

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

Additionally, ID information indicating that the packet is an empty packet is added to the S12 header in advance, and the empty packet identification circuit 10
2 may be used to identify empty packets.

The same effect can also be obtained by inserting and transmitting empty packets for the amount of time that is insufficient for the valid packets played from the broadcast time of one program, instead of recording information on the number of empty packets. or can be obtained.

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

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

Further, the present invention is particularly effective in data communication methods such as broadcasting where the data rate to be transmitted is determined in advance.

Further, in this embodiment, an example of recording and reproducing on a recording medium is shown, but the present invention is not limited to this, and all cases of transmitting and storing data are included in the recording and reproducing of the present invention.

[Effect of the invention] As explained above, when recording, empty packets are identified and
By recording with empty packets removed and then inserting and transmitting empty packets during playback, the capacity of the recording medium can be used efficiently and the recordable time (number of programs) can be increased.

[Brief explanation of drawings]

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

Claims (2)

[Claims] (1) A recording device characterized in that when recording information given as a packet, it has a means for identifying empty packets and a means for removing and recording the empty packets identified by the means. (2) A playback device characterized by having means for detecting that empty packets have been removed during playback, and means for inserting empty packets in response to the detection by the detection means.