JPH05115054A - Information recording and reproducing device - Google Patents

Abstract

PURPOSE:To avoid an inconvenience such as recording of excess data or missing part of a program by specifying the start and end position of recording of a broadcast program when packet data of the broadcast program are recorded. CONSTITUTION:A detector 4 monitors a start packet or an end packet. An MPU 5 collates flags from the detector 4 and a command content from a switch 11 to take a recording timing of the received packet data. When the start packet is detected, received still picture information is recorded on a disk 7. Thus, the recording is started after the start packet is received and recording of excess data is not implemented. On the other hand, when the detector 4 detects an end packet, a series of recording processing is finished. Thus, interruption on the way of the program is avoided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is to provide an information recording / reproducing device, and more particularly to an information recording / reproducing device for recording and reproducing a still image broadcast program in a packet format.

[0002]

2. Description of the Related Art HD (High Definition)
n) Images are drawing attention as a system that provides users with high-definition images. Due to the fineness of the image, it is also suitable for broadcasting still images such as works of art such as paintings, animation, and product catalogs. Although various methods are conceivable for this still image broadcasting, a method of compressing an image signal by high efficiency coding and transmitting packet data as digital data has been developed. Further, when recording these broadcasts, packet data recording can improve the use efficiency of the recording medium because the data amount is compressed by recording the packet data rather than by recording the image signal on the VTR or the like. A playback device is being considered.

FIG. 3 is constructed by using a conventional general technique on the assumption that the packet data broadcast as described above is received and recorded on a disk-shaped recording medium (hard disk, magneto-optical disk, etc.). The system configuration in the case of performing is shown.

In the figure, 31 is a tuner for extracting packet data from broadcast waves, 32 is an error correction decoding for decoding the error correction code added to the packet data extracted by the tuner 31, and correcting the erroneous data. Circuit, 33
Is a buffer for sending the error-corrected packet data to the expansion bus A functioning as an address bus and a data bus. 35 is a microprocessing unit (MP
U), and exchanges the information data and the address bus with respect to the expansion bus A. The MPU 35 controls the operations of a recording circuit, a reproducing device, and a disk device, which will be described later, and
Each is controlled to operate during playback. The packet data sent to the expansion bus A via the buffer 33 is taken into the MPU 35, converted into a code form suitable for recording data in this MPU, and then taken into the disk device 37 via the expansion bus A again. At this time, the disk recording circuit 36 performs processing such as modulation necessary for recording on the still image code processed by the MPU 5 and supplies it to the disk device 37. The disk device 37 records the signal on the disk-shaped recording medium.

Under the control of the CPU 35, the disk device 37 outputs the signal reproduced from the disk-shaped recording medium to the disk reproducing circuit 38. Disk reproducing circuit 38
Performs processing such as demodulation on the obtained signal, and further supplies it to the MPU 35 via the expansion bus A. MPU35 is
The data obtained by reproduction is returned to the original packet data.
Then, the packet data returned to the original is supplied to the monitor device or the like having the decoder of the compression code of the packet data, which is connected to the output terminal 40 thereof via the expansion bus A and the buffer 39. ..

Here, the format of still image packet data is shown in FIG. In the figure, 41 represents one program, 4
Reference numeral 2 represents a plurality of still images in the program, and 43 represents a plurality of packet data forming the still image. When a still image is compressed under high efficiency coding and converted into packet data, one still image is a collection of a plurality of packet data. Further, a plurality of such still images are collected to form one program. On the receiving side, the still image is completed when all the packet data forming the still image is decoded, and the still images are sequentially decoded to complete one still image program.

[0007]

When recording such a still image broadcast program, the recording start timing must be from the first packet data of the first still image. However, it takes time to decode the packet data into a still image. Therefore, since the broadcast (program) of the image displayed on the monitor is received before that, even if recording is started immediately after the program starts, the head of the program is lost. Also, if the recording is started before the program to be recorded is broadcast, the program can be recorded without being lost, but the packet data before the program is also recorded, and it is useless to use a recording medium. Will be. Also, even when the program ends, the last packet data of the last still image of the program is recorded in the same manner, but if the recording is stopped at the wrong timing, the program cannot be recorded until the end, or after that. The packet data is also recorded, and the recording medium is wasted.

The present invention has been made in view of the above-mentioned prior art, and when recording packet data of a broadcast program, at least the recording start position and the end position of the broadcast program should be the start position and the end position of the request set. By doing so, it is intended to provide an information recording / reproducing apparatus which does not have a problem that extra data is recorded or a program is missing.

[0009]

In order to solve this problem, the information recording / reproducing apparatus of the present invention has the following structure. That is, an information recording / reproducing apparatus for receiving, recording and reproducing a still image broadcast to which identification packets corresponding to the start and end of a program are added, and an input unit for inputting a recording start or recording end instruction, A detection unit that detects the identification packet and a control unit that controls the instructed recording start or recording end operation according to the detection of the identification packet by the detection unit are provided.

[0010]

In the configuration of the present invention, when the recording start instruction or the recording end instruction is input by the input means, the process corresponding to the instruction is added when the identification packet corresponding to the instruction content is received. Be energized.

[0011]

Embodiments of the present invention will be described below in detail with reference to the drawings.

FIG. 1 shows a block configuration of a still picture broadcasting recording / reproducing apparatus according to the embodiment, and FIG. 2 shows a format of packet data of a still picture broadcasting to be recorded in the apparatus of FIG.

In FIG. 1, reference numeral 1 is a tuner for extracting packet data from a broadcast wave, and 2 is an error correction for decoding the error correction code added to the packet data 1 extracted by the tuner and correcting the erroneous data. A decoding circuit 3, a buffer for sending the error-corrected packet data to an expansion bus A functioning as an address bus and a data bus, 4 a detector for detecting a start packet and an end packet from the error-corrected packet data, 5 a A micro processing unit (MPU) for transmitting / receiving information data and an address bus to / from the expansion bus A, and controlling operations of a recording circuit, a reproducing circuit, and a disk device described later.
Reference numeral 1 is a switch for operating recording start and stop. 6 is M
A disk recording circuit for performing processing such as modulation necessary for recording the packet data processed by the PU 5, 7 is a disk device for recording the signal from the disk recording circuit 6 on the disk recording medium, and 8 is reproduction from the disk recording medium. A disk reproducing circuit for demodulating the generated signal, 9 is a buffer for outputting the packet data to the outside, and 10 is an output terminal for the packet data.

The packet data extracted from the broadcast wave in the tuner 1 is error-corrected by the error-correction decoder and is output to the expansion bus A via the buffer 3 and to the detector 4. The detector 4 constantly monitors whether the received packet data is a start packet or an end packet.

FIG. 5 is a flowchart showing the operation of the detector 4.

As shown, the detector 4 uses the steps S1,
In S3, it is determined whether a start packet or an end packet has been detected, and they are monitored. When the start packet is detected, the recording start permission flag is turned on and output to the MPU 5.

When the end packet is detected, the recording end flag is turned on (the recording start permission flag is turned off) and output.

The MPU 5 compares these flags from the detector 4 and the instruction contents from the switch 11 to determine the recording timing of the received packet data.

The operation processing procedure of the MPU 5 at the time of receiving and recording is as shown in the flowchart of FIG. Although the description will be mixed up, the program based on the figure is an R (not shown) in the MPU 5.
It is stored in OM.

As shown in the figure, the MPU 5 of the embodiment is in a loop state waiting for an instruction input from the switch 11 when no instruction is given. When a recording start instruction is received in this state, the process proceeds from step S11 to step S12, and waits until the recording start permission flag is turned on. When the recording start permission flag is turned on, that is, when a start packet is detected, the process proceeds to step S13, and the received still image information is recorded on the disc 7. As a result, recording is started after the start packet is received, and no extra data is recorded.

On the other hand, when the recording end instruction is given by the switch 11, the process proceeds to step S15 and waits until the recording end flag becomes a sound. Then, when the recording end flag is turned on, that is, when the end packet is detected, a series of recording processing is ended. by this,
No extra data will be recorded or the program will be cut off in the middle of the program.

That is, according to the apparatus of the embodiment, the recording state is set after the start packet 24 shown in FIG. 2 is received, and unnecessary packet data other than the program is not recorded. When the detector 4 detects an end packet, it issues a recording stop flag to the MPU 5. MPU5
After receiving the recording stop instruction at least by the switch 11, when the flag is received, the disk recording circuit 6 and the disk device 7 are brought into the recording stop state. That is, FIG.
When the end packet 5 indicated by is received, the recording is automatically stopped so that unnecessary packet data other than the program is not recorded.

The operations of the disk recording circuit 6 and the disk device 7 when in the recording state are the same as in the conventional example. The operation during reproduction is also the same as in the conventional example.

As described above, according to this embodiment, the information to be recorded on the recording medium is always from the beginning portion to the end portion of the program from the recording instruction to the recording end instruction. There is no need to record any other unnecessary information.

In the embodiment, the recording of the image is started after the start packet is first detected after the recording start instruction is given by the switch 11. However, if the buffer 3 has a sufficient capacity, even if a recording start instruction is received shortly after the start packet is detected, the recording can be started from the start packet received immediately before. Become. This is also true at the end of recording. That is, when the start or end instruction of recording is instructed by the switch 11, if a start packet or end packet is detected within a predetermined time before or after the instructed time, the operation is performed for the start packet or end packet It is judged that it has been done and processed. In this way, even if the recording start instruction from the switch 11 is not in time for the start packet of the program to be originally recorded, if the instruction is valid within a predetermined time, the instruction is effective.

[0026]

As described above, according to the present invention, at the time of recording packet data of a broadcast program, at least the recording start position and the end position of the broadcast program are set to the start position and the end position of the request set. By doing so, it is possible to provide an information recording / reproducing apparatus which does not have a problem such that extra data is recorded or a program is missing.

[Brief description of drawings]

FIG. 1 is a block configuration diagram of a still image broadcast recording / reproducing apparatus in an embodiment.

FIG. 2 is a diagram showing a format of packet data of still image broadcasting in the embodiment.

FIG. 3 is a block configuration diagram of a recording / reproducing apparatus when configured by using a conventional general technique.

FIG. 4 is a diagram showing a format of packet data of a still image broadcast configured using a conventional technique.

FIG. 5 is a flowchart for explaining the operation of the detector.

FIG. 6 is a flowchart showing the operation contents of the MPU in the receiving state of still image broadcasting in the embodiment.

[Explanation of symbols]

 1 Tuner 2 Apologies Correction Decoder 3 Buffer 4 Detector 5 MPU 6 Disk Recording Circuit 7 Disk Device 8 Disk Playback Circuit 9 Buffer 10 Output Terminal

Claims (1)

[Claims] 1. An information recording / reproducing apparatus for receiving, recording and reproducing a still image broadcast to which identification packets corresponding to the start and end of a program are added, and input means for inputting a recording start or recording end instruction. And an information recording / reproducing device, which comprises: a detection unit that detects the identification packet; and a control unit that controls an operation of recording start or recording end instructed according to the detection of the identification packet by the detection unit. apparatus.