JP2002232846A - Video and audio processor and video and audio processing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a video/audio processor and a video/audio processing method, which record/reproduce video and audio information in a recording medium on real time basis and input/output accompanied information of a video and audio in the same recording medium without damaging recording and reproducing buffers. SOLUTION: When the recording request of accompanied information is given, a recording buffer occupation rate measuring means 7 measures an idle area in a recording buffer memory 4. A recording control means 9 determines whether the recording buffer memory 4 is full of inputted video and sound information while accompanied information which is requested to be recorded by the recording control means 9 is recorded in the recording medium 1. Only when the recording buffer memory 4 is determined not to overflow, accompanied information is recorded in the recording medium 1. Thus, accompanied information on video and audio information can be recorded without damaging the real time record of video and audio information.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a video / audio processing apparatus and a video / audio processing method for recording and reproducing video and audio information on a recording medium such as an optical disk.

[0002]

2. Description of the Related Art In recent years, instead of recording moving picture video and audio information such as MPEG2 on a conventional tape medium, DV
It is often recorded on an optical disk such as a D-RAM. In these devices, it is a general process that the input moving image video and audio information are encoded into a method such as MPEG2, stored in a buffer, and recorded on a recording medium. The MPEG2 encoded video and audio information recorded on the recording medium is read from the recording medium via a disk drive, stored in a buffer, transferred to an MPEG2 decoder, and externally provided as video and audio information. The output is a general process.

In the above-described video / audio information recording / reproducing method, the video and audio information encoded in MPEG2 is generally recorded as a single file on a recording medium. However, in this case, since the video and audio information of different scenes are recorded as the same file, the start offset information of each scene from the beginning of the file of the video and audio information is required to quickly locate the desired scene. In many cases, the management information of the video and audio information files such as is recorded on a medium in a file different from the video and audio information files.

When the video / audio information recording / reproducing system as described above is used for monitoring a road or the like, in addition to recording the moving image and the voice of the road in real time, the time, temperature,
It is required to record accompanying information, such as the amount of traffic of a car, associated with video and audio. FIG. 2 shows a conventional method for recording video and audio in real time and simultaneously recording accompanying information accompanying video and audio.

Next, with reference to FIG. 2, the above-mentioned conventional video / audio information recording system will be described. The video / audio information recording system includes a recording medium 1, a disk drive 2, and an MP that encodes video and audio information into MPEG2 as one of external video and audio information input means.
EG2 encoder 20, recording buffer memory 4,
And an accompanying information storage memory 5 for storing accompanying information associated with video and audio.

The input video and audio information is MPEG2
After being converted into an MPEG2 stream by the encoder 20 and stored in the recording buffer memory 4, the recording medium 1 is converted into one file via the disk drive 2.
Will be recorded. The transfer of the MPEG2 stream from the MPEG2 encoder 20 to the recording buffer memory 4 is performed asynchronously with the recording on the recording medium 1. That is, when the MPEG2 stream data has accumulated to a certain extent in the recording buffer memory 4, the MPEG2 stream is recorded on the recording medium 1.

[0007] Also, management information used for cueing of video and audio, and video such as time, temperature, traffic volume of automobiles, etc. necessary when the video and audio information recording system as described above is used for monitoring roads and the like. And the accompanying information accompanying the audio information is stored in the accompanying information storage memory 5 as the accompanying information. The accompanying information stored in the accompanying information storage memory 5 is generally recorded separately from the video and audio information files on the recording medium 1 via the disk drive 2 after the recording of the video and audio information is completed. It is.

Next, with reference to FIG. 3, a description will be given of a conventional video and audio information reproducing system for reproducing moving picture video and audio information recorded by the above conventional video and audio information recording system from a recording medium. The video and audio information reproducing system includes a recording medium 1, a disk drive 2, and an MPEG2 as one of methods for outputting video and audio information to the outside.
M for decoding moving picture video and audio information encoded in
A PEG2 decoder 21, a reproduction buffer memory 3,
And an associated information storage memory 5 for storing associated information associated with the video and audio information.

The MPEG2-encoded video and audio information recorded on the recording medium 1 is read by the disk drive 2 and transferred to the reproduction buffer memory 3. When the MPEG2 stream is accumulated in the reproduction buffer memory 3 to some extent, it is transferred to the MPEG2 decoder 21 and the video and audio information is decoded and output to the outside as a video and audio output.

Management information used for cueing of video and audio,
And when the video and audio information reproduction system as described above is used for monitoring roads and the like, time, temperature, accompanying information accompanying the video and audio information such as the traffic volume of the car,
The video and audio information are recorded on the same recording medium as the recording medium on which the video and audio information is recorded in a file separate from the video and audio information. Generally, a method of storing the information in the associated information storage memory 5 via the drive 2 is adopted.

[0011]

However, at the time of information recording, after the video and audio are completely recorded on the recording medium, the accompanying information of the video and audio information is recorded.
It is necessary to store all of the accompanying information of the video and audio information to be recorded in each recording operation in the accompanying information storage memory. Therefore, if the accompanying information storage memory becomes full during the recording operation, there is a problem that the accompanying information input thereafter cannot be recorded.

At the time of reproduction, it is necessary to store all of the video and audio accompanying information files on the recording medium in the accompanying information storage memory. There was a problem that the file could not be stored and the accompanying information could not be output. Further, when the power is cut off during video recording, there is a problem that all the accompanying information stored in the memory is lost.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional problems, and continuously records video and audio on a recording medium in real time, and continuously records video and audio from the recording medium. As well as real-time playback, without breaking the recording and playback buffer memory,
It is an object of the present invention to provide a video and audio processing device and a video and audio processing device for inputting and outputting video and audio accompanying information to the same recording medium.

[0014]

A video and audio processing apparatus according to the present invention is a video and audio processing apparatus for recording video and audio information in real time on a recording medium and recording accompanying information accompanying the video and audio information. A recording buffer memory for storing input video and audio information,
Recording buffer occupancy measuring means for measuring the occupancy of video and audio information in the recording buffer memory; and recording control means for controlling recording of the video and audio information in the recording buffer memory on the recording medium. Equipped,
When a recording request for the accompanying information occurs, the recording buffer occupancy ratio measuring unit measures a free area in the recording buffer memory, and the recording control unit records the accompanying information requested to be recorded on the recording medium. It is determined whether or not the recording buffer memory overflows with the input video and audio information, and only when it is determined that the recording buffer memory does not overflow, the accompanying information is recorded on the recording medium. Have. With this configuration, it is possible to record accompanying information of video and audio information without breaking real-time recording (real-time recording) of video and audio information.

In the video / audio processing apparatus according to the present invention, when a recording request for accompanying information is issued, the recording buffer occupancy measuring means measures an empty area in the recording buffer memory, and the recording control means controls recording. While recording the requested accompanying information on the recording medium, it is determined whether or not the recording buffer memory overflows with the input video and audio information, and while the accompanying information is being recorded on the recording medium, the recording buffer memory If the overflow is determined, before recording the accompanying information on the recording medium, video and audio information in the recording buffer memory is recorded on the recording medium to secure a free area, and the recording control means Recording the accompanying information on the recording medium until it is determined that the recording buffer memory does not overflow during a period in which the accompanying information is recorded on the recording medium. It has a configuration that causes locked.
With this configuration, it is possible to prevent the recording buffer memory from overflowing during the recording of the accompanying information of the video and the audio, and to prevent the breakdown of the recording of the real-time video and the audio information.

In the video / audio processing apparatus according to the present invention, when a recording request for the accompanying information is issued, the recording control means calculates a time required for recording the accompanying information of the video and the audio and stores the time in the recording buffer memory. The amount of time that the free area in the recording buffer memory is consumed is calculated from the free area of the recording buffer memory and the amount of video and audio information input per unit time, and the two times are compared to record the accompanying information. It is configured to determine whether or not the recording buffer memory overflows during the period of time. With this configuration, it is possible to predict the occurrence of a buffer overflow during recording of accompanying information of video and audio.

In the video and audio processing apparatus according to the present invention, when a recording request for the accompanying information is issued, the recording control means determines the amount of the accompanying information and the transfer speed of the accompanying information to the recording medium by using the recording control means. Calculate the time required for recording, move the recording head of the recording medium to the position where recording of the accompanying information is started, and calculate the time required for moving the recording head until the start of recording of video and audio information after recording of the accompanying information. It is configured to add to the time required for recording the accompanying information. With this configuration, it is possible to predict the time required for recording the accompanying information of video and audio.

The video and audio processing apparatus according to the present invention reproduces video and audio information from a recording medium in real time,
In a video and audio processing apparatus for reading accompanying information accompanying video and audio information from a recording medium, a reproduction buffer memory for storing the video and audio information read from the recording medium, and a video and audio information stored in the reproduction buffer memory. A reproduction buffer occupancy measurement unit for measuring the occupancy, and a reproduction control unit for reading out video and audio information from the recording medium and controlling transfer to the reproduction buffer memory, and reading out the accompanying information from the recording medium. When a request is generated, the reproduction buffer occupancy ratio measuring unit measures the amount of video and audio information stored in the reproduction buffer memory, and the reproduction / recording control unit records the accompanying information requested to be read. During playback from a medium, it is determined whether or not the playback buffer memory is empty. Only when the buffer memory is determined not become empty during the reading of the accompanying information, it has a structure that reads the accompanying information from the recording medium. With this configuration, it is possible to read accompanying information of video and audio from the same medium on which video and audio information is recorded, without stopping real-time reproduction of video and audio.

In the video / audio processing apparatus according to the present invention, when a request to read accompanying information from the recording medium is issued, the reproduction buffer occupancy measuring means measures the amount of video and audio information in the reproduction buffer memory. Determining whether or not the reproduction buffer memory becomes empty while reading the accompanying information requested to be read from the recording medium by the reproduction control means; When it is determined that the buffer memory is empty, the reproduction control means transfers video and audio information from the recording medium to the reproduction buffer memory before reading the accompanying information from the recording medium,
Reading of the accompanying information from the recording medium until the video and audio information is transferred to the playing buffer memory by an amount determined not to empty the playback buffer memory during the period of reading the accompanying information from the recording medium. It is configured to stop. With this configuration, it is possible to prevent the image buffer and the audio information from being completely output while reading the accompanying information of the video and the audio, and to prevent the reproduction buffer memory from becoming empty.

In the video / audio processing apparatus according to the present invention, when a request for reading accompanying information from the recording medium is issued, the reproduction control means calculates a time required for reading the accompanying information from the recording medium, From the amount of video and audio information in the reproduction buffer memory and the amount of video and audio information output per unit time, the time during which the video and audio information in the reproduction buffer memory is consumed is calculated. By comparing the time, it is determined whether or not the reproduction buffer memory becomes empty while reading the accompanying information from the recording medium. With this configuration, it is possible to predict that the reproduction buffer memory will be empty while reading the accompanying information of video and audio from the recording medium.

In the video / audio processing apparatus according to the present invention, when a request for reading out the accompanying information from the recording medium is issued, the recording control means controls the amount of the accompanying information and the transfer speed for transferring the accompanying information from the recording medium. Calculate the time required for reading the accompanying information from the above, move the recording head of the recording medium to a position where the reading of the accompanying information is started, and after reading the accompanying information, move the recording head until the reproduction of the video and audio information is started. It has a configuration in which a required time is added to a time required for reading the accompanying information. With this configuration, it is possible to predict the time required for reading the accompanying information of video and audio from the recording medium.

A video / audio processing apparatus according to the present invention is a video / audio processing apparatus for recording and reproducing video and audio information in real time on a recording medium, and recording the accompanying information accompanying the video and audio information. And a recording buffer memory for storing audio information.
A reproduction buffer memory for transferring video and audio information from the recording medium, a recording buffer occupancy measuring means for measuring the occupancy of the video and audio information in the recording buffer memory, and a video in the reproduction buffer memory Buffer occupancy measurement means for measuring the occupancy of audio and audio information, recording control means for controlling recording of video and audio information in the recording buffer memory on the recording medium, and the reproduction buffer from the recording medium Playback control means for controlling the transfer of video and audio information to the memory, when a recording request for accompanying information occurs, the recording buffer occupancy measuring means measures the free space in the recording buffer memory, By the recording control means,
It is determined whether or not the recording buffer memory overflows with the input video and audio information while recording the accompanying information requested to be recorded on the recording medium, and the reproduction buffer occupancy measuring means stores the information in the reproduction buffer memory. The amount of stored video and audio information is measured, and the reproduction / recording control means determines whether or not the reproduction buffer memory becomes empty during recording of the accompanying information on the recording medium. A configuration is provided in which accompanying information is recorded on the recording medium only when it is determined that the recording buffer memory does not overflow during recording on the recording medium and that the reproduction buffer memory does not become empty. are doing. With this configuration, at the same time as recording the moving image video and audio information in real time, while reproducing the moving image video and audio information in real time, the accompanying information of the video and audio information is recorded without disrupting the real time recording and reproduction. To make things possible.

In the video / audio processing apparatus according to the present invention, when a recording request for the accompanying information is issued, the recording buffer occupancy measuring means measures a free area in the recording buffer memory, and the recording control means records. While the requested accompanying information is being recorded on the recording medium, it is determined whether or not the recording buffer memory overflows with the input video and audio information. The reproduction control means determines whether or not the reproduction buffer memory becomes empty during recording of the accompanying information on the recording medium, and records the accompanying information on the recording medium. The recording buffer memory overflows during recording, or the reproduction buffer memory becomes empty during recording of the accompanying information on the recording medium. If it is determined that that is, before recording the incidental information to the recording medium, it records video and audio information of the recording buffer memory to the recording medium,
The recording control means determines that the recording buffer memory does not overflow during a period in which the accompanying information is recorded on the recording medium, and the reproduction control means transfers the video and audio information from the recording medium to the reproduction buffer. Transferred to a memory, and until the amount of video and audio information in the reproduction buffer memory can be secured so that the reproduction buffer memory does not become empty during the period of recording the additional information on the recording medium. The recording on the recording medium is stopped, the video and audio information in the recording buffer memory is recorded on the recording medium, and the video and audio information from the recording medium is reproduced. With this configuration, the video and audio information is recorded in real time, and at the same time, the video and audio information is reproduced in real time. It is possible to prevent the breakdown of the processing and the reproduction processing.

In the video and audio processing apparatus according to the present invention, when a recording request for the accompanying information is issued, the recording control means calculates the time required for recording the accompanying information of the video and audio, and the video and audio information are stored in units. The amount of time that the free space in the recording buffer memory is consumed is calculated from the amount input per time, and the playback control means calculates the amount of video and audio information output per unit time from the amount of video and audio information output per unit time. By calculating the time when the video and audio information in the memory is consumed and comparing the three times, whether or not the recording buffer memory overflows during the period of recording the accompanying information, Is determined during the period during which the reproduction buffer memory is empty. With this configuration, it is possible to predict in advance the occurrence of an overflow of the recording buffer memory and an underflow of the reproduction buffer memory when recording accompanying information of video and audio information during real-time recording and reproduction. .

The video and audio processing apparatus according to the present invention records and reproduces video and audio information in real time on a recording medium and reproduces the accompanying information accompanying the video and audio information in the same recording where the video and audio information is recorded. In a video and audio processing device that reads from a medium, a recording buffer memory that stores input video and audio information,
A reproduction buffer memory for storing video and audio information from the recording medium, a recording buffer occupancy measuring means for measuring the occupancy of video and audio information in the recording buffer memory, Reproduction buffer occupancy measuring means for measuring the occupancy of video and audio information, recording control means for controlling recording of video and audio information in the recording buffer memory on the recording medium, and video and audio from the recording medium. Reproduction control means for controlling the transfer of audio information to the reproduction buffer memory, and when a read request for accompanying information occurs, the recording buffer occupancy measurement means measures a free area in the recording buffer memory. The recording control means controls the recording buffer during reading of the accompanying information from the recording medium. It is determined whether or not the memory overflows, the amount of video and audio information stored in the reproduction buffer memory is measured by the reproduction buffer occupancy measurement means, It is determined whether or not the reproduction buffer memory becomes empty while information is being read from the recording medium, and the recording buffer memory does not overflow while the accompanying information is being read from the recording medium, and the reproduction buffer is not overflown. Only when it is determined that the memory is not emptied, the video and audio accompanying information is read from the recording medium. With this configuration, the video and audio information is recorded in real time, and at the same time, the video and audio information is reproduced in real time, and the accompanying information of the video and audio information is recorded from the recording medium without breaking the real-time recording and reproduction. Enables reading.

In the video / audio processing apparatus according to the present invention, when a request for reading out the accompanying information is issued, the recording buffer occupancy measuring means measures a free area in the recording buffer memory, and the recording control means reads out the free area. While reading the requested accompanying information from the recording medium, it is determined whether or not the recording buffer memory overflows with the input video and audio information. The amount of video and audio information is measured, and the reproduction control means determines whether or not the reproduction buffer memory becomes empty while reading the accompanying information requested to be read from the recording medium. The recording buffer memory overflows during reading from the recording medium, or accompanying information is read from the recording medium. If it is determined that the reproduction buffer memory is empty during the recording of the video and audio information in the recording buffer memory on the recording medium before reading the accompanying information from the recording medium, The recording control means determines that the recording buffer memory does not overflow while reading the accompanying information from the recording medium, and the recording control means transfers video and audio information from the recording medium to the reproduction buffer memory. The reading of the accompanying information from the recording medium is stopped until it is determined that the reproduction buffer memory is not empty while the transferred information is being read from the recording medium. With this configuration, while reproducing moving image video and audio information in real time, when reading accompanying information of video and audio information from a recording medium during real time recording and reproduction, it is possible to prevent failure of the recording process and reproduction process. It is possible to prevent.

In the video / audio processing apparatus according to the present invention, when a request for reading the accompanying information is issued, the reproduction control means outputs the time required for reading the accompanying information and the video and audio information per unit time. The amount of video and audio information consumed in the reproduction buffer memory is calculated from the amount and the amount of video and audio information input per unit time is calculated by the recording control means. By calculating the time when the free area is consumed and comparing the three times, it is determined whether or not the recording buffer memory overflows during the reading of the accompanying information, and whether or not the recording buffer memory overflows during the reading of the accompanying information. Has a configuration in which it is determined whether or not the reproduction buffer memory becomes empty. With this configuration, it is possible to predict in advance the occurrence of an overflow of the recording buffer memory and an underflow of the reproduction buffer memory when reading accompanying information of video and audio information from the recording medium during real-time recording and reproduction. .

The video / audio processing method according to the present invention is a video / audio processing method for recording video and audio information on a recording medium in real time and recording accompanying information accompanying the video and audio information. Measuring the occupancy of the video and audio information; and controlling the recording of the video and audio information in the recording buffer memory on the recording medium. Measuring the free space in the recording buffer memory by measuring the occupancy of the video and audio information in the buffer memory for recording, and recording the accompanying information by controlling the recording of the video and audio information on the recording medium. It is determined whether the recording buffer memory overflows during recording on the medium, and the accompanying information is Only when it is determined that the recording buffer memory during recording onto the recording medium is not overflow, and the accompanying information has a configuration that is recorded on the recording medium. With this configuration, it is possible to record moving image video and audio in real time and to record accompanying information accompanying the video and audio.

The video / audio processing method according to the present invention is directed to a video / audio processing method for reproducing video and audio information from a recording medium in real time and reading and outputting accompanying information accompanying the video and audio information from the recording medium. Measuring the occupancy of the video and audio information in the buffer memory for reading, and a transfer control step of reading the video and audio information from the recording medium and controlling the transfer to the buffer memory for reproduction, comprising: When a read request from the recording medium occurs, the amount of video and audio information stored in the reproduction buffer memory is measured by measuring the occupancy of the video and audio information in the reproduction buffer memory. Controlling the transfer to the reproduction buffer memory, It is determined whether or not the reproduction buffer memory is empty during reproduction from the recording medium, and only when it is determined that the reproduction buffer memory is not empty while reading accompanying information from the recording medium. , Associated information is read from the recording medium. With this configuration, it is possible to play back the moving image video and the audio from the recording medium in real time and to read the accompanying information accompanying the video and the audio from the same recording medium.

A video / audio processing method according to the present invention is directed to a video / audio processing method for simultaneously recording and reproducing video and audio information on a recording medium in real time and recording accompanying information accompanying the video and audio information. Measuring the occupancy of the video and audio information in the storage buffer, measuring the occupancy of the video and audio information in the reproduction buffer memory, and transmitting the video and audio information in the recording buffer memory to the recording medium. Controlling the recording, and controlling the transfer of video and audio information from the recording medium to the reproduction buffer memory, wherein when a recording request for accompanying information occurs, the video in the recording buffer memory Measuring the occupancy of audio information and the recording buffer memory Controlling the recording of the video and audio information in the recording buffer memory on the recording medium by measuring the empty area of the recording buffer memory to determine whether or not the recording buffer memory overflows while recording the accompanying information on the recording medium. Measuring the occupancy of the video and audio information in the reproduction buffer memory, and measuring the video and audio information amounts in the reproduction buffer memory, and reading the reproduction buffer memory from the recording medium. Controlling the transfer of video and audio information to the storage medium to determine whether or not the reproduction buffer memory becomes empty during recording of the accompanying information on the recording medium, and performing the recording while recording the accompanying information on the recording medium. Is determined that the buffer memory for reproduction does not overflow and the buffer memory for reproduction does not become empty. Only incidental information has a configuration in which recording on the recording medium. With this configuration, when video and audio are recorded in real time and played back simultaneously, it is possible to record the accompanying information of video and audio information on the same recording medium without disrupting both the recording operation and the reproduction operation. enable.

According to the video / audio processing method of the present invention, video and audio information are recorded on a recording medium in real time and simultaneously reproduced, and accompanying information accompanying the video and audio information is recorded on a recording medium on which the video and audio information are recorded. A video / audio processing method for reading from the same recording medium, wherein measuring the occupancy of the video and audio information in the recording buffer memory; and measuring the occupancy of the video and audio information in the reproduction buffer memory; Controlling the recording of the video and audio information in the recording buffer memory on the recording medium; and controlling the transfer of the video and audio information from the recording medium to the reproduction buffer memory. When a read request occurs, the video and audio in the recording buffer memory Measuring the free space in the recording buffer memory by measuring the occupancy of the information, and controlling the recording of the video and audio information in the recording buffer memory on the recording medium by the step of controlling the recording of the accompanying information to the recording medium. Determining whether the recording buffer memory overflows during reading from the memory, and further measuring the occupancy of the video and audio information in the reproduction buffer memory by the video and audio information amount in the reproduction buffer memory. Controlling the transfer of video and audio information from the recording medium to the reproduction buffer memory to determine whether or not the reproduction buffer memory becomes empty while reading the accompanying information from the recording medium. It is ensured that the recording buffer memory does not overflow while reading the accompanying information from the recording medium. And has a configuration that reads accessory information only if the reproduction buffer memory is determined to not be emptied from said recording medium. With this configuration, when moving image video and audio are recorded in real time and played back at the same time, accompanying information of video and audio can be read from the same recording medium without breaking both the recording operation and the reproducing operation.

The gist of the video / audio processing apparatus and the video / audio processing method according to the present invention is as follows. When recording an input video / audio signal, the recording buffer memory for storing the input video and audio, and the video and audio in the recording buffer memory. A recording buffer occupancy measuring unit for measuring the occupancy of audio information and a recording control unit, and when a request for recording additional information attached to the video and audio is generated during recording of video and audio in real time, recording and reproduction are performed. From the length of the video and audio management information recorded by the control means, the time required to record the accompanying information on the recording medium is calculated, and the recording buffer memory obtained from the measurement result of the occupancy rate measuring means of the recording buffer memory. Calculate the time during which the free area of the memory is consumed. As a result of comparing both the calculated times, if the time required for recording the video and audio accompanying information is shorter, the accompanying information is recorded, and if the time for consuming the free space of the recording buffer memory is shorter, The video and audio information is recorded on the recording medium, and after the recording is completed, the buffer occupancy measuring means measures the empty area of the buffer again, and when an empty area exceeding the time required for recording the accompanying information of the video and audio is obtained. This makes it possible to record accompanying information of video and audio without breaking recording of video and audio information performed in real time.

The gist of the video / audio processing apparatus and the video / audio processing method according to the present invention is as follows. When reproducing a recorded video / audio signal, a reproduction buffer memory, a reproduction buffer occupancy measuring means, a reproduction control means, With
When reproducing video and audio in real time, when reading the video and audio accompanying information recorded on the same recording medium as the video and audio information, it is necessary to read the accompanying information from the size of the video and audio accompanying information. The required time is calculated, and the time required for the video and audio information stored in the reproduction buffer memory to be consumed is calculated by the reproduction buffer occupancy measurement means. The two calculation times are compared, and if the time required for reading the accompanying information is shorter, the accompanying information is read from the recording medium. If the time during which the video and audio information in the reproduction buffer memory is consumed is short, the video and audio information is read from the recording medium, and after the reading is completed, the reproduction buffer occupancy ratio measuring means again uses the reproduction buffer. Calculate the time that video and audio information in memory is consumed, and when the amount of video and audio information exceeds the time required to record the accompanying information of video and audio, play back the video and audio information in real time. The reading of the accompanying information can be performed without stopping.
According to the present invention, it is possible to realize recording and reading of accompanying information of video and audio to and from a recording medium without breaking real-time recording and reproduction of video and audio.

[0034]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to the accompanying drawings. First, the configuration of a video and audio processing device according to an embodiment of the present invention will be described with reference to the block diagram of FIG.

Referring to FIG. 1, a video / audio processing apparatus according to the present embodiment includes a disk-shaped recording medium 1 such as a DVD-RAM, a disk drive 2 for recording or reading data on or from recording medium 1, a recording medium. 1 for storing moving picture video / audio information encoded in MPEG2 or the like read out for reproduction via the disk drive 2 and recorded in the disc drive 2, and in the recording medium 1 encoded in MPEG2. A recording buffer memory 4 for storing moving image video / audio information to be recorded, a memory 5 for storing accompanying information associated with moving image video / audio information to be recorded or reproduced, and a reproduction buffer memory 3 Playback buffer occupancy ratio measuring means 6 for measuring the amount of moving image video / audio information, and a free area (or free space) of the recording buffer memory 4. And recording the buffer occupancy measuring means 7 for measuring the magnitude of the amount), the accompanying information reproduction buffer memory 3 or accompanying information accompanying the recording medium 1 in the moving image and audio information or video image and audio information storage memory 5
Playback control means 8 for controlling the reading performed on the video data, and a recording medium for the moving picture video / audio information or the accompanying information accompanying the moving picture video / audio information stored in the recording buffer memory 4 or the accompanying information storage memory 5, respectively. Recording control means 9 for controlling the recording of the video data 1 and video data and audio information encoded in MPEG2 or the like stored in the reproduction buffer memory 3 and decoded into a video video signal and an audio signal for output. An audio output means 10 and a moving picture video signal and an audio signal inputted from outside
And video / audio input means 11 for transferring the data to the recording buffer memory 4.

Next, the operation of the video and audio processing apparatus according to the embodiment of the present invention will be described with reference to FIG. Figure 1
The solid arrow in the drawing is the flow of the video / audio information and the accompanying information accompanying the video / audio information, and the dotted arrow is the flow of the control information. When recording the input moving image video / audio signal, the moving image video / audio signal input to the video / audio input means 11 is encoded into a format such as MPEG2 and transferred to the recording buffer memory 4. The recording control means 9 records the encoded moving picture video / audio information stored in the recording buffer memory 4 as a file on the recording medium 1 via the disk drive 2.

Further, in order to search for a scene when reproducing the recorded moving picture video / audio information, accompanying information such as a scene start position and a recording time is recorded on the recording medium 1 in a file separate from the video / audio information. I do. Furthermore, when this video / audio processing device is used for monitoring roads, the accompanying information accompanying the video / audio such as the recorded time, temperature, and traffic volume is also recorded in a file separate from the video / audio information. I do. When accompanying information associated with video / audio to be recorded is input, it is stored in the accompanying information storage memory 5. If the accompanying information is immediately recorded on the recording medium 1 at the timing when it is stored in the accompanying information storage memory 5, the video / audio information in the recording buffer memory 4 cannot be recorded on the recording medium 1 during that time. The video / audio information is accumulated in the buffer memory 4 and its free space is exhausted, so that the video / audio input means 11 cannot transfer the input video / audio information to the recording buffer memory 4, and the recording process fails. there is a possibility.

Therefore, in this embodiment, when the accompanying information is stored in the accompanying information storage memory 5 and a recording request of the accompanying information is generated, the recording buffer occupancy measuring means 7 sets the current recording buffer memory to the present recording buffer memory. 4 free space,
The recording control means 9 determines the time during which the free area is consumed from the free area of the recording buffer memory 4 and the current coding rate of the video / audio information (the amount of video and audio information input per unit time). .

The recording control means 9 obtains the amount of accompanying information stored in the accompanying information storage memory 5 and determines the amount of accompanying information based on the transfer speed and the amount of accompanying information that the disk drive 2 transfers to the recording medium 1. Find the time required. further,
The recording control means 9 moves the recording head of the disk drive 2 to a position where recording of the accompanying information is started on the recording medium 1 to record the accompanying information, and then moves the recording head to the recording start position of the video / audio information. And the time required for recording the additional information obtained from the transfer speed of the additional information and the amount of the additional information transferred from the disk drive 2 to the recording medium 1 described above.

Further, the recording control means 9 compares the time required for consuming the free space of the recording buffer memory 4 with the time required for recording the accompanying information. If the former time is longer than the latter, The associated information stored in the associated information storage memory 5 is recorded on the recording medium 1. In this case, since the recording buffer memory 4 does not overflow during recording of the accompanying information, the accompanying information can be recorded without breaking the original video / audio recording process.

The recording control means 9 compares the time required for consuming the free space of the recording buffer memory 4 with the time required for recording the accompanying information, and determines that the latter time is longer than the former. Waits for the recording of the accompanying information stored in the accompanying information storage memory 5 on the recording medium 1 and prioritizes the recording of the video / audio information stored in the recording buffer memory 4. After the recording of a certain amount of video / audio information is completed, the recording buffer occupancy measuring means 7 calculates the free space of the recording buffer memory 4 again, and the recording control means 9 determines the time during which the free area of the recording buffer memory 4 is consumed. Is calculated again, and the time required for consuming the free area of the recording buffer memory 4 is compared with the time required for recording the accompanying information.
As a result of the comparison, the accompanying information stored in the accompanying information storage memory 5 is recorded on the recording medium 1 at the timing when the former time is longer than the latter. As a result, it is possible to avoid overflow of the recording buffer memory 4 during recording of the accompanying information, and to record the accompanying information without disrupting the original video / audio recording process.

Next, reproduction of video / audio information and accompanying information recorded on the recording medium 1 will be described with reference to FIG. When playing back recorded video and audio signals,
Video / audio information encoded in a format such as MPEG2 recorded on the recording medium 1 is stored in the reproduction buffer memory 3 via the disk drive 2. Video /
The audio output means 10 takes out the video / audio information stored in the reproduction buffer memory 3 and decodes the information coded in a format such as MPEG2 into a moving image video signal and an audio signal to output.

When a plurality of scenes are recorded in one video / audio information file, an accompanying information file in which accompanying information such as a scene start position and a recording time for cueing each scene is recorded. Is read before starting reproduction of the video / audio information. When the video / audio processing apparatus is used for monitoring a road or the like, an associated information file accompanying the video / audio, such as recorded time, temperature, and traffic volume, is read in advance. However, if the total of these pieces of information to be read is larger than the prepared memory, it is necessary to sequentially read the information during reproduction.

When a request for reading the accompanying information of video and audio is issued during the reproduction of the video and audio information, the reading of the accompanying information file on the recording medium 1 is immediately performed at that timing. Since the video / audio information file cannot be read, the video / audio information is not sent from the disk drive 2 to the reproduction buffer memory 3. On the other hand, the video / audio output means 10 takes out the video / audio information from the reproduction buffer memory 3 asynchronously with the reading from the recording medium 1. 3
The video and audio information stored in the
Audio playback may fail.

When a request for reading the accompanying information occurs,
The reproduction buffer occupancy measuring means 6 calculates the amount of video / audio information currently stored in the reproduction buffer memory 3,
The reproduction control means 8 determines the video / audio information from the video / audio information amount in the reproduction buffer memory 3 and the decoding rate of the recorded video / audio information (the amount of video / audio information output per unit time). Find the time that information is consumed.

The reproduction control means 8 obtains the amount of additional information to be read from the recording medium 1, and obtains the time required for reading the additional information from the transfer speed and the amount of additional information transferred from the recording medium 1 by the disk drive 2. Further, the reproduction control means 8 moves the recording head of the disk drive 2 to the position where the reading of the accompanying information from the recording medium 1 is started, reads the accompanying information, and then moves the head to the start of the reading of the video / audio information. The time is obtained, and is added to the above-described time required for reading the accompanying information obtained from the transfer speed at which the disk drive 2 transfers from the recording medium 1 and the amount of accompanying information.

The reproduction control means 8 compares the time during which the video and audio information in the reproduction buffer memory 3 is consumed with the time required to read out the accompanying information from the recording medium 1, and the former time is the latter. If it is longer, the associated information file recorded on the recording medium 1 is read and stored in the associated information storage memory 5. In this case, since the reproduction buffer memory 3 does not underflow while reading the accompanying information, the accompanying information can be read without breaking the original playback processing of the video / audio information.

The reproduction control means 8 compares the time required for consuming the video / audio information in the reproduction buffer memory 3 with the time required for reading the accompanying information from the recording medium 1, and determines the latter time. If the former is longer than the former, the recording medium 1
After waiting for the reading of the associated information file from the storage medium, the video / audio information file on the recording medium 1 is read and the transfer to the reproduction buffer memory 3 is prioritized. After the transfer of a certain amount of video / audio files to the reproduction buffer memory 3 is completed, the reproduction buffer occupancy measuring means 6 calculates the amount of video / audio information in the reproduction buffer memory 3 again, and the reproduction control means 8 executes reproduction. The time during which the video / audio information in the buffer memory for consumption 3 is consumed is obtained again, and the time required for the video / audio information in the buffer memory for reproduction 3 to be consumed is compared with the time required for reading the accompanying information. As a result of the comparison, when the former time is longer than the latter, the associated information file recorded on the recording medium 1 is read out to the associated information storage memory 5 at that timing. This allows the reproduction buffer memory 3 to be read during reading of the accompanying information file.
Can be prevented from underflowing, and the accompanying information can be read out and output to the outside without disrupting the original video / audio information reproduction processing.

It is known that by using a disk as a recording medium, recording and reproduction can be performed simultaneously, which was not possible with a tape medium by using the advantage of random access. At the same time as the recording buffer occupancy measuring means 7 measures the free space of the recording buffer memory 4, the reproducing buffer occupancy measuring means 6 measures the reproduction buffer memory 3.
The amount of video and audio information in the buffer is measured, and both buffers fail, that is, the recording buffer memory 4 does not overflow, the reproduction buffer memory 3 does not underflow, and the reproduction control means | It is possible to control recording and reading on the recording medium 1 by the disk drive 2 in cooperation with each other, and it is possible to simultaneously record and reproduce moving picture video / audio information.

When a request for recording accompanying information of video and audio is issued during simultaneous recording and reproduction of moving image and audio information, the reproduction buffer occupancy measuring means 6 reads the video and audio in the reproduction buffer memory 3. The amount of audio information is measured, and the reproduction control means 8 obtains the time during which the amount of video / audio information in the reproduction buffer memory 3 is consumed from the amount of video / audio information and the decoding rate of the video / audio information. On the other hand, the recording buffer occupancy measuring means 7 determines the free space of the recording buffer memory 4, and
The recording control means 9 obtains the time for which the free area of the recording buffer memory 4 is consumed from the free area of the recording buffer memory 4 and the coding rate of the video / audio information, and further stores the accompanying information on the recording medium 1. Calculate the time required for recording.

Then, the time when the amount of video / audio information in the reproduction buffer memory 3 is consumed, the time when the free area of the recording buffer memory 4 is consumed, and the time required for recording the accompanying information are compared. If the time during which the amount of video / audio information in the reproduction buffer memory 3 is consumed and the time during which the free space of the recording buffer memory 4 is consumed are longer than the time required to record the accompanying information, Is recorded on the recording medium 1. As a result, the recording buffer memory 4 does not overflow while the accompanying information is being recorded, and the reproduction buffer memory 3 does not underflow.
The accompanying information can be recorded without disrupting the recording and reproduction processing of the audio information.

In the above, a comparison is made between the time when the amount of video and audio information in the reproduction buffer memory 3 is consumed, the time when the free area of the recording buffer memory 4 is consumed, and the time required for recording the accompanying information. When the time required for recording the accompanying information is longer than the time consumed for the amount of video / audio information in the reproduction buffer memory 3 or the time consumed for the free space in the recording buffer memory 4 Waits for the recording of the accompanying information on the recording medium 1, and gives priority to the recording process and the reproduction process.

After a certain amount of video / audio information has been recorded on the recording medium 1 and reading has been completed, the reproduction buffer occupancy measuring means 6 again measures the amount of video / audio information in the reproduction buffer memory 3, The reproduction control means 8 obtains the time during which the video / audio information amount in the buffer is consumed from the video / audio information amount and the decoding rate of the video / audio information. The recording control means 9 obtains the free space of the buffer from the free area of the recording buffer memory 4 and the coding rate of the video / audio information, and further obtains the accompanying information. Calculate the time required to record the data.

Then, the time when the amount of video / audio information in the reproduction buffer memory 3 is consumed, the time when the free area of the recording buffer memory 4 is consumed, and the time required for recording the accompanying information are compared. When the time for consuming the video / audio information amount in the reproduction buffer memory 3 and the time for consuming the free area of the recording buffer memory 4 are longer than the time required for recording the accompanying information. Records the accompanying information on the recording medium 1. Thereby, it is possible to prevent an overflow of the recording buffer memory 4 during recording of the accompanying information and an underflow of the reproduction buffer memory 3 before recording.

When a request for reading out accompanying information of video and audio is made during simultaneous recording and reproduction of moving image and audio information, the reproduction buffer occupancy measuring means 6 stores the reproduction buffer memory 3 in the reproduction buffer memory 3. The video / audio information amount is measured, and the reproduction control means 8 obtains the time during which the video / audio information amount of the reproduction buffer memory 3 is consumed from the video / audio information amount and the decoding rate of the video / audio information. On the other hand, the recording buffer occupancy measuring means 7 determines the free space of the recording buffer memory 4, and the recording control means 9 controls the recording buffer memory 4.
The time required for the free area of the recording buffer memory 4 to be consumed is obtained from the free space of the recording buffer memory 4 and the coding rate of the video / audio information.

Further, the time required for reading the accompanying information file from the recording medium 1 is calculated, and the time for consuming the video / audio information amount in the reproduction buffer memory 3 and the free area of the recording buffer memory 4 are calculated. The time consumed and the time required to read the accompanying information are compared. And
If the time during which the video / audio information amount in the reproduction buffer memory 3 is consumed and the time during which the empty area of the recording buffer memory 4 is consumed are longer than the time required to read the accompanying information, From the recording medium 1. As a result, the recording buffer memory 4 does not overflow while the accompanying information is being read, and the reproducing buffer memory 3 does not underflow. Therefore, the recording process and the reproducing process of the original video / audio information can be performed without breaking the original information. Reading can be performed.

In the above, the time when the amount of video / audio information in the reproduction buffer memory 3 is consumed, the time when the free area of the recording buffer memory 4 is consumed, and the time required for reading the accompanying information are compared. However, if the time required to read the accompanying information is longer than the time during which the video / audio information amount in the reproduction buffer memory 3 is consumed or the time during which the free space in the recording buffer memory 4 is consumed, The reading of the accompanying information file from the recording medium 1 is waited, and the recording process and the reproduction process are prioritized. After a certain amount of video / audio information has been recorded on the recording medium 1 and reading has been completed, the reproduction buffer occupancy measuring means 6 measures the video / audio information amount in the reproduction buffer memory 3 again,
The reproduction control means 8 obtains the time during which the video / audio information amount in the buffer is consumed from the video / audio information amount and the decoding rate of the video / audio information. The free space of the recording control means 9 is determined.
Calculates the time during which the free space of the buffer is consumed from the free space of the recording buffer memory 4 and the coding rate of the video / audio information.

Also, the video data in the reproduction buffer memory 3
The time when the amount of audio information is consumed, the time when the free area of the recording buffer memory 4 is consumed, and the time required for reading the accompanying information are compared, and the amount of video / audio information in the reproduction buffer memory 3 is reduced. If the time consumed and the time spent in the empty area of the recording buffer memory 4 are longer than the time required to read the accompanying information, the accompanying information file is read from the recording medium 1. As a result, an overflow of the recording buffer memory 4 and an underflow of the reproduction buffer memory 3 can be prevented before reading the accompanying information.

[0059]

The video and audio processing apparatus and the video and audio processing method according to the present invention are constructed as described above. In particular, the time during which the free area of the recording buffer memory is consumed is recorded on the recording medium. If the recording time is longer than the recording time, the accompanying information is recorded on the recording medium, and in the opposite case, the video and audio information in the recording buffer memory is recorded on the recording medium, so that the video and audio performed in real time The accompanying information can be recorded on the same recording medium without breaking the recording of the information on the recording medium.

The video / audio processing apparatus and the video / audio processing method according to the present invention are configured as described above. In particular, the time during which the video and audio information stored in the reproduction buffer memory is consumed is used for reading out the accompanying information. If the time is shorter than the required time, the video and audio information is read from the recording medium. On the contrary, the reading of the accompanying information is performed from the recording medium, so that the video and audio information can be read in real time. The accompanying information can be read from the same recording medium without stopping the reproduction and causing the reproduction operation to fail.

As is clear from the above description, the video and audio processing apparatus and the video and audio processing method according to the present invention do not disrupt video and audio reproduction even during simultaneous real-time recording and reproduction. Recording and reading of audio accompanying information can be performed.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a video and audio processing device according to an embodiment of the present invention;

FIG. 2 is a block diagram of a video and audio information recording system illustrating a conventional recording method of video and audio and its accompanying information;

FIG. 3 is a block diagram of a video and audio information recording system for explaining a conventional video and audio reading method for accompanying information.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Recording medium 2 Disk drive 3 Reproduction buffer memory 4 Recording buffer memory 5 Associated information storage memory 6 Reproduction buffer occupancy measurement means 7 Recording buffer occupancy measurement means 8 Recording control means 9 Reproduction control means 10 Video / audio output means 11 Video / audio input means 20 MPEG2 encoder 21 MPEG2 decoder

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) H04N 5/937 H04N 5/93 CF term (Reference) 5C052 AA04 AB04 CC06 CC11 DD04 DD06 DD08 5C053 FA14 FA23 GA11 GB06 GB11 GB38 HA33 JA07 JA16 KA04 KA05 5D044 AB05 AB07 BC01 CC04 EF03 EF05 FG10 FG18 HH02 HH05 HH07 JJ03 5D045 DB01

Claims (18)

[Claims] 1. A recording buffer memory for storing input video and audio information in a video and audio processing apparatus for recording video and audio information in real time on a recording medium and recording accompanying information accompanying the video and audio information. When,
Recording buffer occupancy measuring means for measuring the occupancy of video and audio information in the recording buffer memory; and recording control means for controlling recording of the video and audio information in the recording buffer memory on the recording medium. When a recording request for accompanying information is issued, the recording buffer occupancy ratio measuring unit measures a free area in the recording buffer memory, and the recording control unit stores the accompanying information requested to be recorded on the recording medium. It is determined whether or not the recording buffer memory overflows with the input video and audio information during recording. Only when it is determined that the recording buffer memory does not overflow, the accompanying information is recorded on the recording medium. A video / audio processing apparatus characterized by the above-mentioned. 2. When a recording request for accompanying information is issued, the recording buffer occupancy ratio measuring means measures a free area in the recording buffer memory, and the recording control means reads the accompanying information requested to be recorded by the recording control means. It is determined whether the recording buffer memory overflows with the input video and audio information during recording on the recording medium, and if it is determined that the recording buffer memory overflows while recording the accompanying information on the recording medium, Before recording the accompanying information on the recording medium,
Video and audio information in the recording buffer memory is recorded on the recording medium to secure an empty area, and the recording control means overflows the recording buffer memory during a period in which the accompanying information is recorded on the recording medium. 2. The video and audio processing apparatus according to claim 1, wherein the recording of the accompanying information on the recording medium is stopped until it is determined that there is no accompanying information. 3. When a recording request for accompanying information is issued, the recording control means calculates the time required for recording the accompanying information of video and audio, and calculates the free space in the recording buffer memory and the video and audio. The amount of information input per unit time is used to calculate the time during which the free space in the recording buffer memory is consumed, and by comparing the two times, the time during which the accompanying information is recorded is calculated. 3. The video / audio processing apparatus according to claim 2, wherein it is determined whether or not the recording buffer memory overflows. 4. When a recording request for accompanying information is issued, the recording control means calculates a time required for recording the accompanying information from an amount of the accompanying information and a transfer speed at which the accompanying information is transferred to the recording medium. Then, the recording head of the recording medium is moved to a position where recording of the accompanying information is started, and the time required for moving the recording head until the recording of video and audio information is started after the recording of the accompanying information is necessary for recording the accompanying information. 4. The video / audio processing apparatus according to claim 3, wherein the time is added to the time. 5. A video and audio processing apparatus for reproducing video and audio information from a recording medium in real time and reading accompanying information accompanying the video and audio information from the recording medium.
A reproduction buffer memory for storing video and audio information read from the recording medium; a reproduction buffer occupancy measuring means for measuring the occupancy of video and audio information in the reproduction buffer memory; Playback control means for reading information and controlling transfer to the playback buffer memory, wherein when a request to read accompanying information from the recording medium occurs, the playback buffer occupancy measurement means measures the content in the playback buffer memory. The amount of video and audio information stored in the storage medium is measured, and the reproduction / recording control means determines whether or not the reproduction buffer memory becomes empty during reproduction of the read-requested accompanying information from the recording medium. Only when it is determined that the reproduction buffer memory does not become empty during reading of the accompanying information, A video / audio processing apparatus for reading out from the recording medium. 6. A reproduction buffer occupancy ratio measuring unit measures an amount of video and audio information in the reproduction buffer memory when a request for reading accompanying information from the recording medium is issued. It is determined whether or not the reproduction buffer memory becomes empty during reading of the accompanying information requested to be read from the recording medium, and it is determined that the reproduction buffer memory becomes empty while reading the accompanying information from the recording medium. In this case, the reproduction control means transfers the video and audio information from the recording medium to the reproduction buffer memory before reading the accompanying information from the recording medium, and within a period in which the accompanying information is read from the recording medium. Transferring video and audio information to the playback buffer memory by an amount determined not to empty the playback buffer memory; In the recording video and audio processing apparatus according to claim 5, wherein the reading of the accompanying information be stopped from the medium. 7. When a request to read accompanying information from the recording medium is issued, the reproduction control means calculates a time required for reading the accompanying information from the recording medium,
From the amount of video and audio information in the reproduction buffer memory and the amount of video and audio information output per unit time, the time during which the video and audio information in the reproduction buffer memory is consumed is calculated. 7. The video / audio processing apparatus according to claim 6, wherein a comparison is made between times to determine whether or not the reproduction buffer memory becomes empty while the accompanying information is being read from the recording medium. 8. When a request to read accompanying information from the recording medium is issued, the recording control means needs to read the accompanying information from the amount of the accompanying information and the transfer speed at which the accompanying information is transferred from the recording medium. A time required for moving the recording head until the start of reproduction of video and audio information after reading the accompanying information and moving the recording head of the recording medium to a position where reading of the accompanying information is started. 8. The video / audio processing apparatus according to claim 7, wherein the time is added to a time required for reading the data. 9. A video and audio processing apparatus for recording and reproducing video and audio information in real time on a recording medium and recording the accompanying information accompanying the video and audio information. A buffer memory, a reproduction buffer memory for transferring video and audio information from the recording medium, a recording buffer occupancy measuring means for measuring an occupancy of video and audio information in the recording buffer memory, Reproduction buffer occupancy measurement means for measuring the occupancy of video and audio information in a buffer memory, recording control means for controlling recording of video and audio information in the recording buffer memory on the recording medium, and the recording medium Playback control means for controlling the transfer of video and audio information to the playback buffer memory from When a recording request for accompanying information is issued, the recording buffer occupancy ratio measuring unit measures a free area in the recording buffer memory, and the recording control unit stores the accompanying information requested to be recorded on the recording medium. During recording, it is determined whether or not the recording buffer memory overflows with the input video and audio information, and the amount of video and audio information stored in the reproduction buffer memory by the reproduction buffer occupancy measuring means is determined. Measuring, by the reproduction / recording control means, whether or not the reproduction buffer memory becomes empty during recording of the accompanying information on the recording medium, and determining whether or not the recording buffer is empty while recording the accompanying information on the recording medium. Only when it is determined that the memory does not overflow and the reproduction buffer memory does not become empty, the accompanying information is recorded on the recording medium. Video and audio processing apparatus according to claim and. 10. When a recording request for accompanying information is issued, the recording buffer occupancy ratio measuring means measures an empty area in the recording buffer memory, and the recording control means stores the accompanying information requested to be recorded by the recording control means. It is determined whether or not the recording buffer memory overflows with the input video and audio information during recording on the recording medium. Further, the reproduction buffer occupancy measuring means determines the amount of video and audio information in the reproduction buffer memory. Measuring, by the reproduction control means, determining whether or not the reproduction buffer memory becomes empty while recording the accompanying information on the recording medium; and Overflows or when it is determined that the reproduction buffer memory becomes empty during recording of the accompanying information on the recording medium, Before recording the information on the recording medium, the video and audio information in the recording buffer memory is recorded on the recording medium, and the recording control means performs the recording while recording the accompanying information on the recording medium. It is determined that the buffer memory does not overflow, and the reproduction control means transfers the video and audio information from the recording medium to the reproduction buffer memory, and performs the reproduction during a period in which the accompanying information is recorded on the recording medium. Until the amount of video and audio information in the reproduction buffer memory can be secured so that the buffer memory for the memory is not empty, stop recording the accompanying information on the recording medium,
10. The video and audio processing apparatus according to claim 9, wherein the video and audio information in the recording buffer memory is recorded on the recording medium, and the video and audio information from the recording medium is reproduced. 11. When a recording request for accompanying information is issued, the recording control means calculates the time required for recording the accompanying information of video and audio, and calculates the amount of input video and audio information per unit time. From the amount of output of video and audio information per unit time by the playback control means, and calculates the video and audio information in the playback buffer memory. Is calculated, and by comparing the three times, it is determined whether the recording buffer memory overflows during the recording of the accompanying information, and whether the recording buffer memory overflows during the recording of the accompanying information. 11. The video and audio processing apparatus according to claim 10, wherein it is determined whether or not the reproduction buffer memory becomes empty. 12. A video and audio processing apparatus which records and reproduces video and audio information in real time on a recording medium and reads accompanying information accompanying the video and audio information from the same recording medium on which the video and audio information is recorded. , A recording buffer memory for storing input video and audio information, a reproduction buffer memory for storing video and audio information from the recording medium, and an occupancy of video and audio information in the recording buffer memory. Recording buffer occupancy measuring means for measuring, reproduction buffer occupancy measuring means for measuring the occupancy of video and audio information in the reproduction buffer memory, and the recording medium for video and audio information in the recording buffer memory Recording control means for controlling the recording of the video and audio information from the recording medium Reproduction control means for controlling transfer to the raw buffer memory; and when a request for reading accompanying information is issued, the recording buffer occupancy ratio measuring means measures an empty area in the recording buffer memory, and The control means determines whether or not the recording buffer memory overflows while the accompanying information is being read from the recording medium, and further the video stored in the reproduction buffer memory by the reproduction buffer occupancy measuring means. And the amount of audio information is measured, and the reproduction control means determines whether or not the reproduction buffer memory becomes empty while reading the accompanying information requested to be read from the recording medium. If the recording buffer memory does not overflow during reading from and the reproduction buffer memory does not become empty. A video and audio processing apparatus characterized by reading out accompanying information of video and audio from the recording medium only when it is determined. 13. When a read request for accompanying information occurs, the recording buffer occupancy ratio measuring means measures a free area in the recording buffer memory, and the recording control means stores the accompanying information requested to be read by the recording control means. It is determined whether or not the recording buffer memory overflows with the input video and audio information during reading from the recording medium. Further, the reproduction buffer occupancy measuring means determines the amount of video and audio information in the reproduction buffer memory. Measuring, by the reproduction control means, determining whether or not the reproduction buffer memory becomes empty during reading of the accompanying information requested to be read from the recording medium, and determining whether or not the accompanying information is being read from the recording medium. When the buffer memory for recording overflows or while the accompanying information is being read from the recording medium, If it is determined to be empty, the video and audio information in the recording buffer memory is recorded on the recording medium before the accompanying information is read from the recording medium. It is determined that the recording buffer memory does not overflow during reading from the recording medium, and the recording control means transfers video and audio information from the recording medium to the reproduction buffer memory, and stores the accompanying information 13. The reading of the accompanying information from the recording medium is stopped until it is determined that the reproduction buffer memory does not become empty during reading from the recording medium.
The video / audio processing apparatus according to the above. 14. When a request to read accompanying information is issued, said playback control means determines the time required to read out the accompanying information and the amount of video and audio information output per unit time. The video control unit calculates a time during which video and audio information is consumed, and the recording control unit calculates a time during which a free area in the recording buffer memory is consumed based on an amount of video and audio information input per unit time. By comparing the three times, it is determined whether or not the recording buffer memory overflows during the reading of the accompanying information, and whether or not the reproducing buffer memory is read during the reading of the accompanying information. 14. The method according to claim 13, wherein it is determined whether or not it is empty.
The video / audio processing apparatus according to the above. 15. A video and audio processing method for recording video and audio information in real time on a recording medium and recording accompanying information accompanying the video and audio information, the occupancy of the video and audio information in a recording buffer memory. And recording of the video and audio information in the recording buffer memory on the recording medium, and when a recording request for the accompanying information occurs, the video and audio in the recording buffer memory Measuring the free space in the recording buffer memory by measuring the occupancy of the information, and controlling the recording of the video and audio information on the recording medium by the step of recording the accompanying information during recording on the recording medium. It is determined whether or not the recording buffer memory overflows, and while the accompanying information is being recorded on the recording medium, the recording buffer A video / audio processing method characterized by recording accompanying information on the recording medium only when it is determined that the buffer memory does not overflow. 16. A video and audio processing method for reproducing video and audio information from a recording medium in real time and reading and outputting accompanying information accompanying the video and audio information from the recording medium, wherein the video and audio information in the reproduction buffer memory is stored. Measuring the occupancy of the audio information; and a transfer control step of reading the video and audio information from the recording medium and controlling the transfer to the reproduction buffer memory, and a request for reading the accompanying information from the recording medium. Occurs, the amount of video and audio information stored in the reproduction buffer memory is measured by measuring the occupancy of the video and audio information in the reproduction buffer memory, and is stored in the reproduction buffer memory. Controlling the transfer to the recording medium while reproducing the accompanying information from the recording medium. Determine whether the playback buffer memory is empty,
Only when it is determined that the reproduction buffer memory is not empty while reading the accompanying information from the recording medium,
A video / audio processing method comprising reading accompanying information from the recording medium. 17. A video and audio processing method for recording and reproducing video and audio information on a recording medium in real time, and recording accompanying information accompanying the video and audio information, the video and audio information being stored in a recording buffer memory. Measuring the occupancy, measuring the occupancy of the video and audio information in the reproduction buffer memory, and controlling the recording of the video and audio information in the recording buffer memory on the recording medium, Controlling the transfer of video and audio information from the recording medium to the reproduction buffer memory. When a recording request for accompanying information occurs, the occupancy of the video and audio information in the recording buffer memory is reduced. Measuring a free area in the recording buffer memory by the measuring step; Controlling the recording of the video and audio information in the buffer memory on the recording medium to determine whether or not the recording buffer memory overflows while recording the accompanying information on the recording medium; Measuring the occupancy of the video and audio information in the memory to measure the amount of video and audio information in the reproduction buffer memory, and controlling the transfer of the video and audio information from the recording medium to the reproduction buffer memory; It is determined whether or not the reproduction buffer memory becomes empty during recording of the accompanying information on the recording medium by the step, without overflowing the recording buffer memory while recording the accompanying information on the recording medium, and Only when it is determined that the reproduction buffer memory is not empty, the accompanying information is written to the recording medium. Video and audio processing method characterized in that recording. 18. A video and audio system in which video and audio information is recorded on a recording medium and reproduced in real time, and accompanying information accompanying the video and audio information is read out from the same recording medium on which the video and audio information is recorded. Measuring the occupancy of video and audio information in the recording buffer memory, measuring the occupancy of video and audio information in the reproduction buffer memory, and processing the video in the recording buffer memory. And controlling the recording of the audio information on the recording medium, and controlling the transfer of the video and audio information from the recording medium to the reproduction buffer memory, when a request to read the accompanying information occurs, Measuring the occupancy of video and audio information in the recording buffer memory; Controlling the recording of video and audio information in the recording buffer memory onto the recording medium by reading the accompanying information from the recording medium by measuring the free space in the recording buffer memory. Determining whether the memory overflows, further measuring the video and audio information amount in the reproduction buffer memory by measuring the occupancy of the video and audio information in the reproduction buffer memory; By controlling the transfer of video and audio information to the reproduction buffer memory, it is determined whether or not the reproduction buffer memory becomes empty while reading the accompanying information from the recording medium, and the accompanying information is read from the recording medium. Without overflowing the recording buffer memory during reading,
A video / audio processing method characterized by reading accompanying information from the recording medium only when it is determined that the reproduction buffer memory is not empty.