JP2000285616A - Video signal recording and reproducing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To complement an insufficient part later when a video/audio has not been partially recorded well because of any abnormality or the like on a magnetic tape by composing a video signal recording and reproducing device of an input part for inputting video/audio data, a first recording part for recording input data on the magnetic tape and a second recording part for recording input data in an auxiliary memory. SOLUTION: The auxiliary memory 6 is a recording medium of device rank with a magnetic tape 4 and digital signals are recorded. When a recording switch 34 is closed and recording of video/audio onto the magnetic tape 4 is started, a memory recording switch 30 is similarly closed as well and video/ audio data are recorded in the auxiliary memory 6. In this case, the oldest video/audio data are erased in the auxiliary memory 6 simultaneously with the input of new video/audio data and by recording the new video/audio data in an empty area on the auxiliary memory 6 generated by that erasure, the latest video/audio data equivalent amount for fixed time are controlled to be held in the auxiliary memory 6.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a memory as a medium for assisting a magnetic tape in recording and reproducing video and audio in an apparatus for recording and reproducing video and audio using a magnetic tape for recording and reproducing video and audio, and uses the memory. The present invention relates to a video / audio recording / reproducing device.

[0002]

2. Description of the Related Art When recording video / audio in a video / audio recording / reproducing apparatus using a magnetic tape as a recording / reproducing medium, not all video / audio data is recorded without error. That is, a video or the like may not be correctly recorded due to a physical abnormality or the like of the magnetic tape.

If a function of simultaneously recording and reproducing the same video and audio while recording the video and audio, that is, a so-called "simultaneous reproduction function" is used, it is possible to immediately confirm the occurrence of the above abnormality. is there. Therefore, if the abnormality that occurred is serious, it is immediately determined that recording should be performed again.
Can decide.

[0004]

However, if the recording is redone, the same amount of work must be done from the beginning as a matter of course. In addition, if the recording object cannot be reproduced (for example, a natural phenomenon that rarely occurs), there is no point in performing the reworking operation.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a method for compensating for an insufficient portion later when video and audio are partially unsuccessfully recorded due to an abnormality of a magnetic tape or the like.

[0006]

SUMMARY OF THE INVENTION A magnetic tape video / audio recording / reproducing apparatus of the present invention has been made in order to solve such a problem.
A first recording unit for recording the input data on a magnetic tape, and a second recording unit for recording the input data on an auxiliary memory
And a recording unit.

[0007] The above-mentioned video / audio recording / reproducing apparatus comprises:
A first output unit for outputting video and audio data recorded on the magnetic tape of the recording unit, an error detection unit for detecting and outputting an error included in the output data, and an error log output from the error detection unit Data and
Furthermore, based on the error log data, the video and audio data recorded on the magnetic tape of the first recording unit is utilized by using the video and audio data recorded in the auxiliary memory of the second recording unit. A data complement operation control unit that complements the error occurrence part may be included.

[0008] The auxiliary memory provided in the video / audio recording / reproducing apparatus may have the following features. That is, since the auxiliary memory has only a certain amount of capacity, if recording progresses and there is no more recordable area, the oldest data is erased at the same time as new data is input, and the auxiliary memory is erased in an empty area generated by the erasing. Although new data is recorded, data for which an error has been detected by the error detection unit may be retained in the auxiliary memory without being erased.

[0009]

According to the present invention, even if partially incomplete video / audio data is generated on a magnetic tape due to a mechanical error or the like generated at the time of recording on the magnetic tape, the data may not be generated. Incomplete data can be complemented by the work after recording. Therefore, the number of cases in which the recording operation on the magnetic tape is re-executed is greatly reduced, and the recording on the magnetic tape can be surely performed even on the recording of an object that cannot be reproduced.

[0010]

FIG. 1 is a block diagram of a part related to the present invention in a magnetic tape video / audio recording / reproducing apparatus according to one embodiment of the present invention. The parts other than the part 2 surrounded by the dotted line are the recording / reproducing head 24 and the related parts provided in the device according to the related art. That is, the video input terminal 26
The video and audio data input from the recording medium is converted into a form suitable for being recorded on the magnetic tape 4 by the recording amplifier 16 and transmitted to the recording / reproducing head 24. The data is recorded by the recording / reproducing head 24 on the magnetic tape 4 whose traveling speed is adjusted by a motor (not shown). Then, the recording / reproducing head 24 reads the data from the magnetic tape 4 whose traveling speed is adjusted by the motor, sends the data to the reproducing amplifier 18, and converts the data into a form suitable for output therefrom. It is sent to the output terminal 28.

In particular, the apparatus of this embodiment has a simultaneous recording / reproducing function which is a known technique. That is, there is provided a function of recording the video and audio data and immediately reproducing the recorded video and audio data for the purpose of confirmation. At this time, both the recording switch 34 and the reproduction switch 36 are connected.

On the other hand, a portion 2 within the dotted line is a portion newly added in the present invention. In particular, the auxiliary memory 6 is a recording medium of the present device alongside the magnetic tape 4, and is a hard disk on which digital signals are recorded, for example.

The auxiliary memory (hard disk) 6 has a fixed storage capacity. Normally, the magnetic tape 4 has a storage capacity capable of recording video and audio for several tens of minutes, whereas the storage capacity of the auxiliary memory (hard disk) 6 is, for example, for five minutes of video. When the recording switch 34 is closed and the recording of the video and audio on the magnetic tape 4 is started, the memory recording switch 30 is also closed and the video and audio data is recorded on the auxiliary memory (hard disk) 6. However, in the auxiliary memory (hard disk) 6, for example, only the latest 5 minutes of video and audio data are left, and older video and audio data are deleted at the same time as input and recording of new video and audio data. In other words, the oldest video / audio data is erased at the same time as the input of new video / audio data, and the new video / audio data is recorded in a free area on the memory (hard disk) 6 generated by the deletion, so that the latest video / audio data for the latest fixed time is recorded. Memory address control is performed such that video and audio data is stored in an auxiliary memory (hard disk) 6. The control is performed by the signal processing control microcomputer 8. However, the video / audio data of the time code value output to the error log data 22 is left without being deleted by the signal processing control microcomputer 8. This “leave without erasing” function will be described later in detail.

In the present embodiment, the minimum unit on the time axis of the video and audio data recorded in the auxiliary memory (hard disk) 6 is "frame" (one frame is 1/1).
30 seconds of video (audio) data.) In order to utilize the video and audio data recorded on the auxiliary memory (hard disk) 6 later on with the video and audio data recorded on the magnetic tape 4, the video and audio data recorded on the auxiliary memory (hard disk) 6 can be used. It is necessary to add a time code for each minimum unit on the time axis, that is, for each frame.

The time code is stored in the time code control circuit 10.
Is generated at intervals of 1/30 seconds. On the other hand, video / audio data is generated on the auxiliary memory (hard disk) 6 via the video input terminal 26 in frame units.
As described above, in the present embodiment, a one-to-one correspondence is created between these time codes and frames. However, the generation of the time code and the generation of the video / audio data are usually not synchronized (see FIG. 2A).

Therefore, the signal processing control microcomputer 8 performs processing for synchronizing the time code and the frame of the video / audio data. As will be described later, in practice, first, a one-to-one correspondence between an address indicating a storage address when a frame (data) is stored on the auxiliary memory (hard disk) 6 and a time code. Is performed, and as a result, a one-to-one correspondence is created between these time codes and frames. By the way, when the head 24 records data on the magnetic tape 4 or reads data from the magnetic tape 4, the servo circuit 12 synchronizes the operations of the head-related mechanisms with a fixed period (for example, 2/30 seconds) pulse signal (frame pulse) is generated and used. In the present embodiment, the signal processing control microcomputer 8 utilizes this. That is, the signal processing control microcomputer 8 receives the pulse signal (frame pulse) from the servo circuit 12 and, based on the frame pulse, converts the time code generated by the time code control circuit 10 into the time code and the input frame data. A one-to-one correspondence is created with the memory address. FIG. 2 shows this state. FIG. 2A shows a state before a one-to-one correspondence is created, and FIG. 2B shows a state after performing processing for creating a one-to-one correspondence.

The relationship between the time code shown in FIG. 2B and the address of the auxiliary memory (hard disk) 6 is stored in the memory unit of the signal processing control microcomputer 8. Therefore, when new video / audio data is input via the video input terminal 26, first, the address on the auxiliary memory (hard disk) 6 is determined by the signal processing control microcomputer 8, and is recorded at that address. The signal processing control microcomputer 8 associates a new time code and its address with reference to the frame pulse and records the new time code in the memory unit of the signal processing control microcomputer 8. afterwards,
If there is a request for output of video / audio data on the auxiliary memory (hard disk) 6, the signal processing control microcomputer 8
Outputs the data of the auxiliary memory (hard disk) 6 by using the time code as a time reference and utilizing the relationship between the time code and the address (FIG. 2B).

Although not shown, the head 24 receives a time code from the time code control circuit 10 when recording data on the magnetic tape 4 and adds the time code to each frame, as is well known. . Therefore,
A time code is added to the video and audio data on the magnetic tape 4 and the video and audio data on the auxiliary memory (hard disk) 6 for each frame. In addition, the application timing of the frame pulse output from the servo circuit is adjusted so that the same time code is assigned to the frame data having the same content on each medium. A part of the adjustment may be performed by the signal processing control microcomputer 8.

As described briefly above, the apparatus of this embodiment is provided with a simultaneous reproduction function that can reproduce video and audio data immediately after recording while recording the video and audio data. ing. Further, although this is also a known technique, an error detection unit 20 for reading recorded video / audio data and checking an error situation occurring on the magnetic tape 4 includes a reproduction amplifier 18 and an output terminal 28. It is located between. The error detector 20 has a function of calculating an “error rate” for each frame.

In consideration of the functions of the error detection unit 20 and the parts related to video / audio reproduction, the present invention provides an error detection unit 2
From 0, the error log data 22 is output and stored in various media (for example, a hard disk) provided in the video / audio recording / reproducing apparatus. That is, if the error detection unit 20 detects video / audio frame data containing an error, the error code is combined with a time code, an error rate, and the like, output as an error log, and stored in the medium.

The error log data 22 can be used for various purposes. For example, when the error log data 22 is generated, the signal processing control microcomputer 8 reads the error log data 22 and further adds an error flag 38 to the video / audio frame data to which the time code is added on the auxiliary memory (hard disk) 6. be able to. Since the auxiliary memory (hard disk) 6 has only a fixed amount of storage capacity which is considerably smaller than that of the magnetic tape 4, new video / audio data is preferentially left, and old video / audio data is deleted in order from the oldest one. , Error flag 38
The video and audio data to which is added can be protected (that is, left) in preference to the new video and audio data. Then, the time code data output to the error log data 22 is given an error flag 38 in the auxiliary memory (hard disk) 6 and remains until the magnetic tape 14 is used for data complementation described later. As described above, in the area of the auxiliary memory (hard disk) 6 other than the area where the video / audio frame data to which the error flag 38 is added is recorded.
Only newer video / audio data is left as long as it can be recorded in the remaining area. That is, in the remaining area, when the video and audio data is recorded and the entire area is filled, the oldest video and audio data is deleted simultaneously with the input of new video and audio data, and the memory (hard disk) 6 generated by the deletion is deleted. The new video / audio data will be recorded in the empty area of.

FIG. 3 is a flowchart showing a process for correcting an error portion of the magnetic tape 4 in the embodiment of the present invention shown in FIG. That is, the error log data 22
Using the video and audio data on the auxiliary memory (hard disk) 6 to which the error flag 38 is added based on the
The data complementing operation control unit 14 until the error occurrence portion of the video / audio data recorded on the magnetic tape 4 is complemented.
And the operation of the related parts. This operation sequence will be described below.

First, the signal processing control microcomputer 8 searches the auxiliary memory (hard disk) 6 for video / audio frame data satisfying the following conditions (ST50). An error flag 38 is provided. Of the audio and video frame data that satisfies

If no data satisfying the condition is found in ST50, it means that the video and audio data recorded on the magnetic tape 4 has no error portion, and the process proceeds to "END". If there is data that satisfies the condition, subsequent processing is performed (ST52).

The signal processing control microcomputer 8 temporarily stores the time code of the searched video / audio frame data in its own memory (ST54).

The data complementing operation control unit 14 reads the error data / time code temporarily stored in the signal processing control microcomputer 8, and sends (advance) the magnetic tape 4 until immediately before the time code (ST56).

The data complementing operation control section 14 connects the “error-free” video / audio data on the auxiliary memory (hard disk) 6 relating to the time code to the memory output switch 32 via the signal processing control microcomputer 8. And outputs it to the recording amplifier 16 (ST58).

The data complement operation control unit 14 includes a head 24
And the head-related parts are set to the recording mode, and the magnetic tape 4
Is updated with the frame data sent from the auxiliary memory (hard disk) 6 (ST60).

Subsequently, the signal processing control microcomputer 8 searches the auxiliary memory (hard disk) 6 for video / audio frame data satisfying the following conditions (ST62). Those with an error flag. Of the video and audio frame data that satisfies the condition, the time code of which is next to the time code of the updated frame data.

If no data satisfying the condition is found in ST62, it means that the video / audio data recorded on the magnetic tape 4 has no more error portion, and the process proceeds to "END". If there is data that meets the conditions,
Subsequent processing is performed again (ST52).

In the description of the above embodiment, the signal processing control microcomputer 8 recognizes which video / audio frame data has an error when recording on the magnetic tape 4.
Searches the data in the auxiliary memory (hard disk) 6, but the error log data 22 may be directly checked.

In the above embodiment, a hard disk is used as the auxiliary memory 6 as a recording medium. However, the present invention is not limited to this. For example, other recording media such as "IC memory" and "magnetic tape" may be used. The present invention can also be realized with a medium.

[Brief description of the drawings]

FIG. 1 is a block diagram of a part related to the present invention in a magnetic tape video / audio recording / reproducing apparatus according to the present invention.

FIG. 2 is a conceptual diagram of a process of synchronizing a time code and a frame (that is, an address) of video data on the basis of a frame pulse; (1) is a state before synchronization;
(2) is a state as a result of performing the synchronization processing.

FIG. 3 is a flowchart illustrating a process of correcting an error portion of a magnetic tape in the embodiment of the present invention of FIG. 1;

[Explanation of symbols]

 4 ... Magnetic tape 6 ... Auxiliary memory (hard disk) 8 ... Signal processing control microcomputer 10 ... Time code control circuit 12 ... Servo circuit 14 ... Data complement operation control unit 16 ... Recording amplifier 18 ... Reproduction amplifier 20 ... Error detection unit 22 ... Error log data 24 ... Head 26 ... Video / audio input terminal 28 ... Video / audio output terminal 30 ... Memory Recording switch 32 ... Memory output switch 34 ... Recording switch 36 ... Reproduction switch

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) H04N 5/7826 H04N 5/782 Z 5/93 5/93 Z

Claims (5)

[Claims] 1. An input unit to which video and audio data is input, a first recording unit that records the input data by a magnetic tape, and a second recording unit that records the input data by an auxiliary memory Video and audio recording and playback device. 2. A first output section for outputting video and audio data recorded on a magnetic tape of the first recording section, and an error detection section for detecting an error contained in the output data and outputting error log data. The video / audio recording / reproducing apparatus according to claim 1, further comprising: 3. An image recorded on a magnetic tape of the first recording unit using video / audio data recorded in an auxiliary memory of a second recording unit based on the error log data. 3. The video / audio recording / reproducing device according to claim 2, further comprising a data complementing operation control unit that complements an error occurrence portion of the audio data. 4. The auxiliary memory has a certain amount of capacity, and when recording progresses and there is no more recordable area, the oldest data is erased at the same time as new data is input, and the auxiliary memory is erased in a free area generated by the erasing. 4. The video / audio recording / reproducing apparatus according to claim 2, wherein new data is recorded, and data in which an error is detected in the error detecting unit is retained without being erased in an auxiliary memory. 5. The input video / audio data is recorded by a first recording unit on a magnetic tape, and at the same time as the recording, the data is recorded on a second recording unit by an auxiliary memory. While outputting the recorded video and audio data to the first output unit, an error in the video and audio data on the magnetic tape is detected, and based on the detected error, the video and audio data recorded in the auxiliary memory is output. A method for recording video and audio data, which complements the video and audio data recorded on the magnetic tape by utilizing.