JPH0668606A - Device for recording and reproducing image information - Google Patents

Abstract

PURPOSE:To suppress deterioration in regenerative image quality at an IN point and an OUT point at an editing time. CONSTITUTION:Inputted image data is divided to a high frequency component and a low frequency component by a data division circuit 1. When the image data by 1 frame is recorded in plural tracks, the high frequency component in the image data is recorded in the first and the final tracks in plural tracks, and the low frequency component is recorded in other tracks. At an editing and recording time, the image data by a first one frame is recorded twice succeedingly in a first two frames interval after recording is started, and the image data by a final one frame is recorded twice succeedingly in a final two frames interval before recording is ended previously. At a reproducing time, image information by one frame of immediately before, immediately after starting of editing record and of immediately before, immediately after ending of editing record are not used.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image information recording / reproducing apparatus for reproducing image information recorded on a magnetic tape in the form of a digital signal, particularly during recording / reproducing in consideration of edit modes such as assemble editing and insert editing. Signal processing.

[0002]

2. Description of the Related Art Image information is converted into a digital signal,
FIG. 1 shows a data processing system in a digital VTR in which helical data is recorded on a magnetic tape by a rotary magnetic head and is reproduced. 1 in encoder 2
The image information for a fixed period is divided into a plurality of blocks, and coding processing (addition of error correction code, addressing to each block, etc.) is performed for each block. This encoded data is digitally modulated by the modulator 3 and then helically recorded on the tape via a magnetic head (not shown).

On the reproducing side, the reproduced digital code obtained by digitally demodulating the reproduced signal from the magnetic head by the demodulator 13 is input to the decoder 12. The decoder 12 uses the parity code added by the encoder 2 at the time of recording to perform error detection on each block of the reproduced image data, corrects any error, and if there is an uncorrectable error, Make corrections such as replacing with data synthesized from correct pixels around the pixels that could not be corrected,
Output the reproduced image information without error.

In such VTR, assemble editing,
Consider a case where an editing operation such as insert editing is performed. At this time, in general, the previously recorded track (old track) immediately before the newly inserted track and the first track (new track) inserted form a joint that maintains continuity. To be controlled. In the future, this joint will be called the edit IN point. Further, the time point at which the recording of the last track is completed when the insertion of the track by editing is completed will be referred to as an edit OUT point.

[0005]

However, in a VTR of the guard bandless solid writing azimuth recording system, the edit IN point or the like is actually caused by a mounting error of the recording head or a track width error, an alignment error at the time of editing, and the like. For example, as shown in FIG. 2, two discontinuous states of recording tracks occur. One of the discontinuous states is shown in FIG.
Track thinning occurs because a part of the widthwise area of the old track immediately before the edit IN point shown in (a) is overwritten and erased by the new track immediately after the edit IN point. The other is edit I, as shown in FIG.
This is the generation of the unerased residual of the previously recorded old track (same azimuth residual) immediately after the N point.

The above is the case of the edit IN point, but the same applies to the edit OUT point. That is, when overwrite editing is performed, the unerased portion of the old track previously recorded occurs just before the editing OUT point in FIG. 2A (same azimuth remaining portion). In addition, a part of the widthwise area of the previously recorded old track immediately after the edit OUT point shown in FIG.
Track thinning occurs due to overwriting and erasing by a new track immediately before the UT point.

Before and after such edit IN point or edit O
When a track having discontinuity that occurs around the UT point is reproduced, the reproduction output signal level decreases and the decoder 12
Therefore, the frequency of error correction and correction is significantly increased, and therefore the reproduced digital image data output from the decoder 12 in FIG. 1 has a reproduced image quality that is visually unnatural. This phenomenon may be further increased when the recording track of the VTR is narrowed to realize long-time recording.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an image information recording / reproducing apparatus having almost no deterioration in reproduced image quality before and after the edit IN point and before and after the edit OUT point. To provide. Another object of the present invention is to provide an image information recording / reproducing apparatus in which reproduction image quality is hardly deteriorated not only during normal reproduction but also at edit IN point and edit OUT point.

[0009]

According to a first image information recording / reproducing apparatus of the present invention (claims 1, 2 and 3), image information for one fixed period (frame or field) is composed of a plurality of tracks, Of the plurality of recording tracks, one or both of the first track and the last track is allocated and recorded with information mainly consisting of high-frequency components in image information for one period, and assembled. In edit modes such as edit and insert edit, edit IN point and edit OU are made in units of image information for one period.
The image information for one period other than the image information for one period including the track immediately before and immediately after the edit IN point and immediately before and after the edit OUT point so as to configure the T point. For a plurality of tracks in a unit, just as the result of error correction and correction relating to the reproduction signal from the track is used as it is, just before, immediately after, and immediately after the edit OUT point where the track thinning or the same azimuth remaining occurs occurs. Also for the tracks immediately before and immediately after, the results of error correction and modification for the reproduced signals from those tracks are used as they are.

According to a second image information recording / reproducing apparatus of the present invention (claim 4), image information of one fixed period (frame or field) is composed of a plurality of tracks, and the first one of the plurality of recording tracks. In one or both of the track and the last track, information mainly composed of high frequency components in the image information for one period is allocated and recorded, and in the edit mode such as assemble edit and insert edit. An edit IN point and an edit OUT point are configured in units of image information for one period,
At the time of reproduction, the plurality of tracks in the image information unit for one period other than the image information for one period including tracks immediately before and immediately after the edit IN point and immediately before and immediately after the edit OUT point are excluded. Immediately before the edit IN point where the track thinning or the same azimuth remaining occurs, using the result of error correction and correction relating to the reproduced signal from the track as it is,
For the tracks immediately after and immediately before and after the edit OUT point, the results of error correction and correction for the reproduced signals from those tracks are not used.

According to a third image information recording / reproducing apparatus of the present invention (Claim 5), image information of one fixed period (frame or field) is composed of a plurality of tracks, and the first of the plurality of recording tracks. In one or both of the track and the last track, information mainly composed of high frequency components in the image information for one period is allocated and recorded, and in the edit mode such as assemble edit and insert edit. An edit IN point and an edit OUT point are configured in units of image information for one period,
At the time of reproduction, at least the track immediately before and immediately after the edit IN point and the track immediately before and after the edit OUT point are included.
For a plurality of tracks of image information units for one period other than the image information for a certain period, the results of error correction and correction relating to the reproduction signal from the tracks are used as they are, and track thinning or the same azimuth remaining occurs. Edit IN
Only for the tracks immediately before and after the point and immediately before and after the edit OUT point, the error occurrence frequency of the reproduction signal from the track is compared with a set threshold value, and the error occurrence frequency exceeds the threshold value. For example, do not use the results of error correction and modification of the reproduced signal from the track,
If it is below the threshold value, the result of error correction and correction for the reproduction signal from the track is used as it is.

According to the fourth image information recording / reproducing apparatus of the present invention (claim 6), the image information unit of one frame is recorded at the time of recording such as assemble editing and insert editing. The image information of the first 1 frame is recorded twice in succession only in the 2 frame period of, and the image information of the last 1 frame is continuously recorded twice only in the last 2 frame period immediately before the edit OUT point at the end of the recording. It is recorded and an edit IN point and an edit OUT point are formed in units of image information of one frame.

At the time of reproduction, other than one track immediately before and immediately after the edit IN point and immediately before and immediately after the edit OUT point, the tracks of the image information unit for another one period which are continuously recorded are recorded from the track. The result of error correction and correction for the reproduced signal of is used as reproduced image data.
Editing that produces thin tracks or the same azimuth remaining I
Regarding the image information immediately before and immediately after the N point, the image information for the last one period in the old track previously recorded at the position immediately before the IN point and the image information for the first one period newly recorded immediately after the IN point. Is not used as reproduced image data. Also, similar reproduction processing is performed immediately before and after the edit OUT point.

The fifth image information recording / reproducing apparatus of the present invention (Claim 7) records in units of image information of one frame at the time of recording such as assemble editing and insert editing. The image information of the last one frame is recorded twice in succession only in the two-frame period of
Edit IN point and edit OUT for each frame of image information
Make up a point. And at the time of playback, just before the edit IN point,
Immediately after and immediately before and immediately after the edit OUT point, for the tracks of image information units that are continuously recorded except for the portion immediately after and immediately after the edit OUT point, the result of error correction and correction relating to the reproduced signal from the track is reproduced image. Use as data.

However, the edit IN in which the track thinning occurs
In the vicinity, the image information for the last one period in the old track previously recorded at the position immediately before the edit IN point and the edit OU near the edit OUT where the same azimuth remaining occurs
The image information for the last one period, which has been recorded just before T, is not used as reproduced image data.

The sixth image information recording / reproducing apparatus of the present invention (Claim 8) records in one frame of image information unit at the time of recording such as assemble editing and insert editing. The image information of the first one frame is recorded twice in succession only during the two frame period of
An edit IN point and an edit OUT point are formed in units of image information of a frame. At the time of reproduction, with respect to the track of the image information unit for another one period which is continuously recorded except the part immediately before and after the edit IN point and immediately before and immediately after the edit OUT point, the reproduction signal from the track is reproduced. The result of error correction and correction regarding is used as reproduced image data.

However, in the vicinity of the edit IN where the same azimuth remains, the image information for the first one period in a new track newly recorded immediately after the edit IN point and the edit OUT near the edit OUT where the track thinning occurs The image information for the first one period in the old track previously recorded at the position immediately after is not used as reproduced image data.

According to a seventh image information recording / reproducing apparatus of the present invention (claim 9), at the time of recording such as assemble editing and insert editing, the first field and the second field are each composed of at least one track. Done 1
Recording is performed in image information units of frames, and edit IN points and edit OUT points are configured in image information units of one frame.
And at the time of reproduction, immediately before and after the edit IN point, and edit O
For the tracks of the other one frame of image information unit, which are continuously recorded except for the part immediately before and after the UT point, the result of error correction and correction relating to the reproduced signal from the track is used as the reproduced image data. .

However, one of the first and second fields in one frame corresponding to the last track previously recorded at the position immediately before the edit IN point where the track becomes thin or the same azimuth remains occurs. The image information is not used as the reproduced image data, and instead, the same reproduced image data as the image information of the other field corresponding to the track ahead of the last track is used. In addition, the first or the second in one frame corresponding to the first track immediately after the edit IN point
The image information of one of the fields is not used as the reproduced image data, and instead, the same reproduced image data as the image information of the other field corresponding to the track after the first track is used. use.

Similarly, the first or second part of one frame corresponding to the last track which has been recorded just before the edit OUT point where the track is thinned or the same azimuth remains occur.
The image information of one of the fields is not used as the reproduced image data, and instead, the same reproduced image data as the image information of the other field corresponding to the track ahead of the last track is used. use. Further, the image information of either one of the first and second fields in one frame corresponding to the first track previously recorded immediately after the edit OUT point is not used as reproduced image data,
As an alternative thereto, the same reproduced image data as the image information of the other field corresponding to the track after the first track is used.

In the eighth image information recording / reproducing apparatus (claim 10) of the present invention, the first field and the second field are each composed of at least one track at the time of recording such as assemble edit and insert edit. Done 1
Recording is performed in image information units of frames, and edit IN points and edit OUT points are configured in image information units of one frame.
And at the time of reproduction, immediately before and after the edit IN point, and edit O
For the tracks of the other one frame of image information unit, which are continuously recorded except for the part immediately before and after the UT point, the result of error correction and correction relating to the reproduced signal from the track is used as the reproduced image data. .

However, an image of either one of the first and second fields in one frame corresponding to the last track previously recorded at the position immediately before the edit IN point where the track is thinned or the same azimuth remains occur. The information is not used as the reproduced image data, and instead, the same reproduced image data as the image information of the other field corresponding to the track ahead of the last track is used. Further, the image information of either the first field or the second field in one frame corresponding to the first track immediately after the edit IN point is not used as the reproduced image data, and the edit IN is used instead of the image information. The same reproduction image data as the image information of the other field immediately before the point is used.

Similarly, image information of either one of the first and second fields in one frame corresponding to the last track which has been recorded just before the edit OUT point where the track is thinned or the same azimuth remains occur. Is not used as the reproduced image data, and instead, the same reproduced image data as the image information of the other field corresponding to the track preceding the last track is used. Further, the image information of either one of the first and second fields in one frame corresponding to the first track previously recorded immediately after the edit OUT point is not used as reproduced image data, Instead, the same reproduced image data as the image information of the other field immediately before the edit OUT point is used.

[0024]

In the first image information recording / reproducing apparatus, just before the edit IN point where the track thinning or the same azimuth remaining occurs,
Since the information mainly including the high frequency component in the image information for one period was originally recorded in the tracks immediately after or immediately before and after the edit OUT point, it is assumed that the error correction and correction of the reproduced signals from those tracks are temporarily performed. Even if the frequency of occurrence increases, the reproduction image quality appears to be deteriorated immediately before and after the edit IN point, immediately before and immediately after the edit OUT point, by using the results of error correction and correction for the reproduced signals from those tracks as they are. Almost never.

In the second image information recording / reproducing apparatus, the high frequency component in the image information for one period originally is recorded on the track immediately before or after the edit IN point or immediately before or after the edit OUT point where the track thinning or the same azimuth remaining occurs. Since the main information is recorded, even if the results of error correction and modification of the reproduced signals from those tracks are not used, the edit IN point is immediately before, immediately after, and the edit OU.
The playback image quality is hardly deteriorated just before and immediately after the T point.

In the third image information recording / reproducing apparatus, the high frequency component in the image information for one period originally is recorded on the track immediately before or after the edit IN point where the track thinning or the same azimuth remains occurs, immediately before or immediately after the edit OUT point. Since the main information is recorded, depending on the error occurrence frequency of the reproduction signal from the track immediately before, immediately after, or immediately before or after the edit OUT point at which track thinning or the same azimuth remaining occurs. Even if it is determined not to use the result of error correction and correction for the reproduction signal from the track, the reproduction image quality hardly appears immediately before and after the edit IN point and immediately before and after the edit OUT point.

In the fourth image information recording / reproducing apparatus, many errors occur in the reproduced signals from the tracks immediately before and immediately after the edit IN point and immediately before and immediately after the edit OUT point due to track thinning or the same azimuth remaining. Even if the frequency of error correction and modification increases, the results of error correction and modification of image information for one period corresponding to those tracks are not used as reproduced image data. The reproduced image quality does not appear to be deteriorated immediately before and after the OUT point.

In the fifth image information recording / reproducing apparatus, images for one period corresponding respectively to the last track immediately before the edit IN point where the track thinning occurs and the last track immediately before the edit OUT point where the same azimuth remains occur. Since the result of error correction and modification of information is not used as reproduced image data, reproduced image quality does not appear to be deteriorated immediately before and after the edit IN point, immediately before and immediately after the edit OUT point. Furthermore, the missing reproduced image can be limited to only the image information for the last one period which has been previously recorded at the position immediately before the edit IN point.

In the sixth image information recording / reproducing apparatus, images for one period corresponding to the first track immediately after the edit IN point where the same azimuth remaining occurs and the first track immediately after the edit OUT point where the track thinning occurs, respectively. Since the result of error correction and modification of information is not used as reproduced image data, reproduced image quality does not appear to be deteriorated immediately before and after the edit IN point, immediately before and immediately after the edit OUT point. Further, the reproduced image to be lost can be limited to only the image information for the first one period previously recorded at the position immediately after the edit OUT point.

In the seventh image information recording / reproducing apparatus, the edit I
As reproduction image data of the last frame previously recorded at the position immediately before the N point, both the first and second fields are:
Reproduction image data of any one field in the frame is assigned, and reproduction image data of any one field in the frame is used as reproduction image data of the first frame immediately after the edit IN point for both the first and second fields. Allotted.

As the reproduced image data of the last frame which has been recorded immediately before the edit OUT point, the reproduced image data of any one field in the frame is assigned to both the first and second fields, and the reproduced image data immediately after the edit OUT point is assigned. As reproduction image data of the first frame previously recorded at the position, reproduction image data of any one field in the frame is assigned to both the first and second fields. Therefore, the reproduced image quality does not appear to be deteriorated immediately before and after the edit IN point and immediately before and after the edit OUT point, and the reproduced image in which the entire one frame is lost does not occur.

In the eighth image information recording / reproducing apparatus, the edit I
As reproduction image data of the last frame previously recorded at the position immediately before the N point, both the first and second fields are:
Reproduced image data of any one field in the frame is assigned. As the reproduced image data of the first frame immediately after the edit IN point, for example, in the first field, the reproduced image data of any one field in the previously recorded last frame is assigned to the position immediately before the edit IN point, Reproduced image data of any one field in the first frame immediately after the edit IN point is assigned to the field.

As the reproduced image data of the last frame which has been recorded just before the edit OUT point, the reproduced image data of any one field in the frame is assigned to both the first field and the second field. As the reproduced image data of the first frame previously recorded at the position immediately after the edit OUT point, for example, the first field is assigned the reproduced image data of any one field in the last frame recorded just before the edit OUT point. , The reproduced image data of any one field in the previously recorded first frame is assigned to the second field immediately after the edit OUT point. Therefore, the reproduced image quality does not appear to be deteriorated immediately before and immediately after the edit IN point and immediately before and after the edit OUT point.
A reproduced image in which the entire frame is missing does not occur.

[0034]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the drawings showing the embodiments thereof.

Example 1. FIG. 3 is a block diagram showing a main configuration of a data processing system of a digital VTR according to the present invention. In the recording processing system of FIG. 3, 1 is a data division into which digital image data relating to image information to be recorded is inputted. In the processing system on the reproduction side of FIG. 3, reference numeral 13 is a demodulator, 12 is a decoder including an error detection / correction circuit, and 15 is an operation reverse to that of the data division circuit 1. This is a data synthesizing circuit.

The recording operation will be described with reference to FIGS. 3 and 4. FIG. 4 exemplifies a state of a track pattern formed by recording one frame of image information on a magnetic tape in this embodiment. In FIG. 4, as an example, the image information of one frame is divided into eight tracks in total. That is, as is well known, the image information of one screen (field) generally has a relatively low frequency component that occupies a large amount of information in one screen and a high frequency component that has a small amount of occupied information compared to it. It consists of and.

Considering the current TV system, one frame is made up of two fields (screens). Therefore, in FIG. 4, the first track and the last track of the eight tracks are, for example, the first track. High-frequency components (high-definition information) HDA and HDB having a small amount of information corresponding to the field and the second field are allocated, and the low-frequency components of each field having a large amount of information are allocated to the six tracks sandwiched between them. Have been assigned.

As a method of recording image information of one screen by dividing it into a plurality of tracks in this way, a method such as multi-channel recording, multi-segment recording, or multi-channel multi-segment recording is known. Also in the present embodiment, the number of tracks is not limited as long as the number of recording tracks corresponding to one frame of image information is at least three in accordance with the above recording method.

In FIG. 3, in the data dividing circuit 1 to which digital image data relating to image information is input, the image information constituting one frame is divided into a low frequency component and a high frequency component for each screen, and further divided. The high-frequency component and the low-frequency component are arranged in the track order shown in FIG. In the encoder 2, block division is performed on division information corresponding to each track in 1-frame units from the data division circuit 1,
Encoding is performed for each block by adding a parity code for error detection / correction to the image code at the time of reproduction and adding a synchronization code, an ID code and the like.

The coded data is digitally modulated by the modulator 3 and then helically recorded on the magnetic tape through a recording head (not shown). FIG. 5 exemplifies one block in a helical track recorded on a magnetic tape. A plurality of one block composed of a synchronization code, an ID code, an image code and a parity code is continuously recorded on the helical track. ing.

FIG. 6 shows the state of recording tracks when assemble editing and insert editing are performed in such a VTR. In FIG. 6, the old track recorded before the edit IN point is recorded, that is, the last track K1 of the eight tracks corresponding to the image information of one screen.
Is partially overwritten by a new track (track S) immediately after the edit IN point, resulting in a track narrowing. As for the edit OUT point, the unerased part of the previously recorded old track located immediately before that point is left (the same azimuth remains).

Next, the operation during reproduction will be described. The reproduced digital code from each track obtained by digitally demodulating the reproduced signal from the magnetic head by the demodulator 13 is a decoder.
Entered in 12. The decoder 12 uses the parity code added by the encoder 2 at the time of recording to perform error detection on each block of the reproduced image data, corrects any error, and if there is an uncorrectable error, Modifications such as replacement with data synthesized from correct pixels around the pixels that could not be corrected are performed, and error-free image data is input to the data synthesis circuit 15. The data synthesizing circuit 15 outputs the digital image data of the original image information for each frame by the synthesizing operation opposite to that of the data dividing circuit 1.

At this time, in the case of having the edit IN point and the edit OUT point as shown in FIG. 6, the track K1 immediately before the edit IN point is thinned during reproduction, so that the track K1 from the track K1 is removed. The reproduction output level decreases and many errors are likely to occur in the reproduced digital code. Further, the track S immediately after the edit IN point is formed as a regular track width in the recording state shown in FIG. 6, but the tracking may be disturbed at the joint of the edit IN points depending on the tracking control accuracy during reproduction. is there. Therefore, the track S is affected by the off-track, and many errors occur in the reproduced digital code from the track S as in the case of the track K1 described above, and the decoder 12 has many opportunities for error correction and correction. there is a possibility.

However, what was originally recorded on the tracks K1 and S is the high-definition information HDB and HDA in which the high-frequency component in the image information of one screen, that is, the amount of information contained in the image information of one screen is generally small. Therefore, even if the frequency of error correction and correction for the reproduced signals from those tracks increases, deterioration such as unnatural reproduction image quality immediately before and immediately after the edit IN point is hardly sensed.

When the vicinity of the edit OUT point of FIG. 6 is reproduced, it is similar to the case of the edit IN point described above. That is, the last track (track L) in the inserted image information of the last one screen immediately before the edit OUT point.
The high-definition information HDB is recorded in, and the high-definition information HDA is also recorded in the first track (track K2) in the previously recorded image information of one screen immediately after the edit OUT point. Therefore, similarly to the case of the edit IN point, the deterioration such as the reproduced image quality just before and immediately after the edit OUT point looks unnatural is hardly sensed.

From the above, immediately before or after the edit IN point where the track becomes thin and the same azimuth remains occur, or immediately after the edit O.
Originally, high-definition information containing a small amount of information in the image information of one screen was recorded on the tracks immediately before and after the UT point. Even if the frequency of is increased, the reproduced image quality hardly appears immediately before and after the edit IN point and immediately before and after the edit OUT point.

In the above-mentioned embodiment, the case where the information mainly consisting of the high-definition information of only one of the fields is assigned to the first track and the last track among the plurality of tracks constituting one frame has been described. , 1 for each of the first or last tracks
Even if the high-definition information of each field constituting the frame is distributed so as to be mixed, an ID code capable of discriminating to which field the high-definition information mixed in the track belongs is recorded in advance. The same effect as that of the above embodiment is obtained.

In the above embodiment, the case of editing in units of one frame has been described. However, the high-definition information in the field is recorded in the first and last tracks of a plurality of tracks for the image information in each field. It may be divided and recorded, and the same effect as described above can be obtained and the editing can be realized in the field unit.

Example 2. Further, in the first embodiment, the high-definition information is assigned to both the first track and the last track in a plurality of tracks constituting one frame, but only one of the first and last tracks is assigned. High-definition information may be assigned. That is, as shown in FIG. 2A, the track connection at the edit IN point and the track at the OUT point during edit recording is controlled so that the track thinning always occurs at the edit IN point and the same azimuth remainder occurs at the edit OUT point. If so, FIG. 7 (a)
As described above, the high-definition information HD may be assigned only to the last track among the plurality of tracks that form one frame.

In this case, since the track K1 in which the track thinning has occurred and the track L in which the same azimuth remaining has occurred are both the last tracks among the plurality of tracks, even if the high-definition information reproduced from these tracks is used. The same effect as that of the first embodiment is obtained. Further, as shown in FIG. 2B, the track connection at the edit IN point and the track at the OUT point during editing recording is controlled so that the same azimuth remains at the edit IN point and the track becomes thinner at the edit OUT point. If so, the high-definition information HD may be assigned only to the first track of the plurality of tracks constituting one frame as shown in FIG. 7B. in this case,
Since the track S in which the same azimuth remains and the track K2 in which the track thinning occurs are both the first tracks among a plurality of tracks, even if the high-definition information reproduced from these tracks is used, it is the same as in the first embodiment. Produce the effect of.

Since the case where editing is performed in units of one frame is shown here, as shown in FIG. 7A, the last track among a plurality of tracks constituting one frame or as shown in FIG. 7B. As the information mainly composed of the high frequency component assigned to the first track among a plurality of tracks constituting one frame, the high-definition information of one of the first field and the second field constituting one frame is used. It is advisable to record the allocation. Also, when editing in units of one field,
The high-definition information in the field may be assigned to the last track in the plurality of tracks forming one field or the first track in the plurality of tracks forming one field.

Example 3. In the first embodiment, the information mainly composed of the high frequency component and the information mainly composed of the low frequency component allocated to the individual recording tracks are input digital image data by the data dividing circuit 1 of FIG. However, the present invention is not limited to this. That is, in the data division circuit 1, as an example of transform encoding, digital image data of one screen is divided into blocks (N × N) each consisting of N pixels in the horizontal and vertical directions, and each block is subjected to a two-dimensional discrete cosine transform ( Information is compressed by applying DCT).

FIG. 8A shows a well-known two-dimensional DCT (8 × 8) base image, and FIG. 8B shows the transform coefficient power of the image block. Generally, there is a property that the power of the low frequency component of the conversion coefficient is large, but among them, there is a block in which the high frequency component is relatively larger than other blocks. It is divided into many blocks and blocks with many low frequency components, and the block with relatively many high frequency components is one of the first track and the last track among a plurality of tracks composed of image information for one period. It is possible to allocate one track or both tracks and allocate blocks having many low frequency components to the other tracks, and the same effect as the above-mentioned embodiment is obtained.

Further, each block is equally divided into a high frequency component and a low frequency component (for example, in FIG. 8B, the diagonally lower right half of the diagonally lower right half divided by a diagonal line connecting the upper right end to the lower left end). High-frequency component and low-frequency component in diagonally upper left half), one track of the first track and the last track among a plurality of tracks composed of image information for one period as a collection of high-frequency components for each block Alternatively, both tracks may be assigned and the other tracks may be assigned a group of low-frequency components for each block, and the same effect as in the above-described embodiment is obtained. The transform coding such as DCT is not limited to the above two dimensions, and may be one dimension or three dimensions.

Example 4. In the first embodiment, the result of error correction and correction relating to the reproduction signal from the track in which the information having the high frequency component is recorded is used without omission. On the contrary, the high frequency component is mainly used. The result of error correction and correction relating to the reproduction signal from the track on which the information is recorded may not always be used. In this case, for example, in the ID code on each recording track shown in FIG. 5, it is possible to identify the first track or the last track of each of a plurality of tracks constituted by image information for one period. Addresses are arranged so that, during reproduction, information mainly composed of high-frequency components in the image information for one period allocated to the first or last track identified using the track address is not used.

That is, from the above-mentioned first or last track in which the information mainly consisting of high-frequency components in the image information for one period is recorded in portions other than immediately before and after the edit IN point and immediately before and after the edit OUT point. Since the result of error correction and modification relating to the reproduction signal of is not used, it is possible that high-definition information is always lost at the time of reproduction and the reproduction screen seems to be slightly blurred. There is an advantage that there is no difference in reproduced image quality between immediately before and after the point and other portions.

In the fourth embodiment, the first track or the last track among a plurality of tracks composed of image information for one period immediately before and immediately after the edit IN point and immediately before and immediately after the edit OUT point is also changed. Even in the first track or the last track in each of the plurality of tracks other than the above, the result of error correction and modification regarding the reproduction signal for the information mainly including the high frequency component from there shall not be used. However, only the result of error correction and modification relating to the reproduction signal from the first track or the last track of the plurality of tracks immediately before, immediately after, and immediately after and immediately after the edit OUT point, which is likely to cause many errors, has occurred. Do not use, and for the other tracks, errors regarding the playback signal The results of the positive and modification may be used without omission.

In this case, the edit IN point or the edit OU
The index signal that can identify the T point is, for example, edited IN
The image is recorded and arranged on the first track among a plurality of tracks composed of the image information for the first one period edited and inserted immediately after the point, or the image for the one period last edited and inserted immediately before the edit OUT point. It is recorded and arranged on the last track of a plurality of tracks composed of information. At the time of reproduction, the edit IN point or the edit OUT point is identified by using this index signal, and the reproduction signal from the first track or the last track of the plurality of tracks immediately before and after the edit IN point and immediately before and after the edit OUT point. Do not use only for the result of error correction and correction related to.

That is, the reproduction signal from the first or last track in which the information mainly consisting of the high frequency component in the image information for one period is recorded just before and immediately after the edit IN point and immediately before and after the edit OUT point. Edit I
Although there may be a slight difference in resolution between the playback screens immediately before and after the N point and immediately before and after the editing OUT point, and the playback screens at other portions, the unnaturalness of the playback image quality is hardly sensed.

Example 5. FIG. 9 is a block diagram showing the main configuration of a data processing system of another digital VTR according to the present invention. In FIG. 9, the parts denoted by the same numbers as in FIG. In the processing system on the reproduction side of FIG. 9, 14 is a memory having a capacity for storing image information data for a predetermined period, 21 is an error counting circuit for counting the error occurrence frequency, and 22 is control of writing / reading of the memory 14. It is a memory control circuit.

The track pattern formed by recording one frame of image information on the magnetic tape in this embodiment is the same as that in the above-mentioned embodiment (FIG. 4), and therefore its explanation is omitted. The operation of this embodiment will be described below with reference to FIGS. 9 and 4.

In FIG. 9, in the data division circuit 1 to which digital image data relating to image information is input, the image information constituting one frame is divided into a low frequency component and a high frequency component for each screen, and further divided. The high-frequency component and the low-frequency component are arranged in the track order shown in FIG. In the encoder 2, block division is performed on division information corresponding to each track in 1-frame units from the data division circuit 1,
A parity code for performing error detection / correction is added to the image code at the time of reproduction for each block, and encoding including a synchronization code, an ID code, a track address, etc. is performed.

The coded data is digitally modulated by the modulator 3 and then helically recorded on the magnetic tape via a recording head (not shown). FIG. 10 exemplifies one block in a helical track recorded on a magnetic tape, and a plurality of one block composed of a synchronization code, an ID code, a track address, an image code, and a parity code is continuously formed on the helical track. It is recorded in.
It is assumed that the track address includes a track number that can identify the first and last tracks among the eight tracks constituting one frame.

FIG. 6 shows the state of recording tracks when assemble editing and insert editing are performed in such a VTR. In FIG. 6, a part of the last track K1 recorded immediately before the edit IN point, that is, the last track K1 of the eight tracks corresponding to the image information of one frame is a new track immediately after the edit IN. This is a case where the first track (track S) in the eight tracks of one frame is overwritten to cause track thinning.
As for the edit OUT point, the unerased part of the previously recorded old track located immediately before that point is left (the same azimuth remains).

Next, the operation during reproduction will be described. The reproduced digital code from each track obtained by digitally demodulating the reproduced signal from the magnetic head by the demodulator 13 is a decoder.
Entered in 12. The decoder 12 uses the parity code added by the encoder 2 at the time of recording to perform error detection on each block of the reproduced image data, corrects any error, and if there is an uncorrectable error, The image data having no error is output to the memory 14 by performing correction such as replacement with data synthesized from correct pixels around the pixel that cannot be corrected.

In the memory 14, the writing is controlled by the memory control circuit 22 in order to store these image data. At the same time, the decoder 12 detects the error detection flag EF indicating that an error has been detected and the track number TN in the track address provided for each block at the time of recording,
They are input to the error counting circuit 21. In the error counting circuit 21, the first and last tracks are selected from the inputted track numbers TN among a total of eight tracks for each frame of image information, and the same is input only for the first and last tracks. The number of times the error detection flag EF is generated is compared with a certain threshold value.

If the number of occurrences of the error detection flag EF is smaller than the threshold value, the memory control circuit receiving the comparison result.
Reference numeral 22 gives to the memory 14 a control signal for reading the data after error correction and correction for the track written in the memory 14 without omission. Further, when the memory control circuit 22 receives the comparison result in which the number of times the error detection flag EF is generated exceeds the threshold value, the memory control circuit 22 supplies the memory 14 with a control signal that the data written in the memory 14 from the track is not read. .

However, except for the case where the edit IN point and the edit OUT point associated with the edit operation are present, from the track which is continuously recorded, immediately before or after the edit IN point or immediately before the edit OUT point shown in FIG. The track thinning and the same azimuth remaining observed immediately after that are hardly generated. Therefore, in that case, few errors occur and the number of occurrences of the error detection flag EF becomes smaller than the threshold value. Therefore, the memory control circuit 22 gives the memory 14 a control signal for reading the data written in the memory 14 without omission. become. memory
The data read from 14 is output by the data synthesizing circuit 15 to the digital image data of the original image information of one frame unit by the synthesizing operation opposite to that of the data dividing circuit 1.

On the other hand, the edit IN as shown in FIG.
In the case of having a point and an edit OUT point, the track K1 immediately before the edit IN point is thinned during reproduction, so that the reproduction output level from this track K1 decreases and many errors occur in the reproduction digital code. More likely to. Therefore, the chances of error correction and correction in the decoder 12 are significantly increased in the track K1, and the memory 14 in which the output data of this decoder 12 is written.
If the data corresponding to the track K1 is read out as is, the reproduced image of one frame including the track K1 output from the data synthesizing circuit 15 becomes an image that is extremely unnatural in terms of visual sense. This phenomenon becomes more likely to appear as the VTR becomes narrower.

The track S immediately after the edit IN point is shown in FIG.
In the recording state shown in, the track width is formed as a regular track width, but depending on the tracking control accuracy during reproduction, the edit I
Tracking may be disturbed at the joint of N points. Therefore, the track S may be affected by the off-track, and like the case of the track K1, the first reproduced image after the edit IN point including the track S may be visually unnatural. There is.

Therefore, in the error counting circuit 21, the edit I
Based on the result of comparing the number of occurrences of the error detection flag EF for each of the last track K1 and the first track S immediately before and after the N point with the threshold value, the number of occurrences of the error detection flag EF for the track is determined. If it is less than the threshold value, a control signal is supplied to the memory 14 so that the data written for the track is read out from the memory 14 without omission. Then, if the number of times the error detection flag EF is generated from the track exceeds the threshold value, the memory control circuit 22 supplies the memory 14 with a control signal that the data written in the memory 14 for the track is not read. The operation is performed according to the error occurrence frequency.

When reproducing near the edit OUT point in FIG. 6, the operation is the same as that at the edit IN point described above. That is, the last track (track L) in the inserted image information of the last one screen immediately before the edit OUT point.
Also, for each of the first track (track K2) in the previously recorded image information of one screen immediately after the edit OUT point, similarly to the above, it was written in the memory 14 in accordance with the error occurrence frequency from the track. It controls whether or not the data on the track can be read.

As described above, the tracks K1 and S immediately before and after the edit IN point or the tracks L and K2 immediately before and immediately after the edit OUT point are included in the image information of one screen including the respective tracks. In general, since high frequency component data having a small amount of information is recorded, the error occurrence frequency of the track increases during reproduction, and as a result, the data of the track written in the memory 14 is not read from the memory 14. Even if it happens, since only the high-definition information in the image information of one screen is not used as data, the reproduced image quality is hardly deteriorated. On the contrary, if the error occurrence frequency of the track does not increase during reproduction, and as a result the data of the track written in the memory 14 can be read from the memory 14 without omission,
Since high-definition information can be used, it is possible to obtain a reproduction image quality having almost the same resolution as the image information at the time of recording.

In the above embodiment, the tracks K1 and S or the edit OU immediately before and after the edit IN point are reproduced.
For each of the tracks L and K2 immediately before and after the point T, the availability of reading the data relating to the track written in the memory 14 is controlled independently in accordance with the error occurrence frequency from the track. However, for example, with respect to the track K1 immediately before the edit IN point, the error occurrence frequency of the track increases during reproduction, and as a result, the memory 14
If the data of the track written in the above is not read from the memory 14, in this case, it is determined that the edit IN point is reached, and the track S immediately after the edit IN point is unconditionally written in the memory 14. Also, the data for the track S may not be read from the memory 14.

Similarly, regarding the track L immediately before the edit OUT point, the error occurrence frequency of the track increases at the time of reproduction, and as a result, false data for the track written in the memory 14 is not read from the memory 14. In such a case, the track K2 immediately after the edit OUT point may be unconditionally not read from the memory 14 even for the track K2. In this way, since the high-definition information is not used in almost the same manner in the image information immediately before and immediately after the editing IN point, the reproduction image quality immediately before and immediately after the editing IN point can be balanced. Image quality degradation due to loss of information becomes even less noticeable. This effect is exactly the same immediately before and after the edit OUT point.

In the above embodiment, the case where only the high-definition information of one of the fields is assigned to the first track and the last track of a plurality of tracks constituting one frame has been described. Even if the high-definition information for each field constituting one frame is distributed to each track, an ID code capable of discriminating to which field the high-definition information mixed in the track belongs is previously set. If recorded, the same effect as that of the above-described embodiment can be obtained.

In the above embodiment, the case of editing in units of one frame has been described. However, the high-definition information in the field is recorded in the first and last tracks of the plurality of tracks for the image information in each field. It may be divided and recorded, and the same effect as described above can be obtained and the editing can be realized in the field unit.

Example 6. Further, in the fifth embodiment, the high-definition information is assigned to both the first track and the last track in a plurality of tracks constituting one frame, but only one of the first and last tracks is assigned. High-definition information may be assigned. That is, as shown in FIG. 2A, the track connection at the edit IN point and the track at the OUT point during edit recording is controlled so that the track thinning always occurs at the edit IN point and the same azimuth remainder occurs at the edit OUT point. If so, FIG. 7 (a)
As described above, the high-definition information HD may be assigned only to the last track among the plurality of tracks that form one frame.

In this case, since the track K1 in which the track narrowing has occurred and the track L in which the same azimuth remaining has occurred are both the last tracks among the plurality of tracks, error correction and correction of the high-definition information reproduced from these tracks are performed. Even if the use of the result of the modification is adaptively determined, the same effect as that of the above embodiment can be obtained. Further, as shown in FIG. 2B, the track connection at the edit IN point and the track at the OUT point during editing recording is controlled so that the same azimuth remains at the edit IN point and the track becomes thinner at the edit OUT point. If so, the high-definition information HD may be assigned only to the first track of the plurality of tracks constituting one frame as shown in FIG. 7B. in this case,
Since the track S in which the same azimuth remains and the track K2 in which the track thinning occurs are both the first tracks among a plurality of tracks, it is possible to use the result of error correction and correction for high-definition information reproduced from these tracks. Even if the propriety is adaptively determined, the same effect as that of the above embodiment can be obtained.

Since the case where editing is performed in units of one frame is shown here, as shown in FIG. 7A, the last track among a plurality of tracks constituting one frame or as shown in FIG. 7B. As the information mainly composed of the high frequency component assigned to the first track among a plurality of tracks constituting one frame, the high-definition information of one of the first field and the second field constituting one frame is used. It is advisable to record the allocation. Also, when editing in units of one field,
The high-definition information in the field may be assigned to the last track in the plurality of tracks forming one field or the first track in the plurality of tracks forming one field.

In the fifth and sixth embodiments, the first track or the last track among a plurality of tracks composed of image information for one period immediately before and immediately after the edit IN point and immediately before and immediately after the edit OUT point is also used. , And uniformly in the first track or the last track in each of the plurality of tracks in other parts,
Although the number of error occurrence frequencies relating to the reproduction signal of the information mainly including the high frequency component is counted, the plurality of errors immediately before and after the edit IN point and immediately before and after the edit OUT point are likely to occur. The error occurrence frequency is counted only for the reproduction signal from the first track or the last track of the tracks, and the error correction for the information mainly composed of the high frequency component reproduced from the track is performed according to the error occurrence frequency. You may decide whether to use the result of the modification.

In this case, the edit IN point or the edit OU
The index signal that can identify the T point is, for example, edited IN
It is recorded and arranged on the first track among a plurality of tracks composed of image information for one period that has been edited and inserted immediately after the point, or the last one edited and inserted immediately before the edit OUT point.
It is recorded and arranged on the last track of a plurality of tracks composed of image information for a fixed period. At the time of reproduction, the edit IN point or the edit OUT point is identified by using this index signal, and the reproduction signal from the first track or the last track of the plurality of tracks immediately before and after the edit IN point and immediately before and after the edit OUT point. Whether or not to use the result of error correction and correction is determined according to the error occurrence frequency.

That is, the reproduction signal from the first or last track in which the information mainly consisting of the high frequency component in the image information for one period is recorded just before and after the edit IN point and immediately before and after the edit OUT point. Since the result of error correction and correction regarding is used adaptively or not depending on the error occurrence frequency, edit IN
Although a slight difference in resolution may occur between the playback screen immediately before and after the point and immediately before and immediately after the edit OUT point and the playback screen at other portions, the unnaturalness of the playback image quality is hardly sensed. .

Example 7. In the fifth and sixth embodiments, the information mainly composed of the high frequency component and the information mainly composed of the low frequency component assigned to the individual recording tracks is obtained by converting the input digital image data into the data dividing circuit 1 of FIG. However, the present invention is not limited to this. That is,
Similar to the third embodiment described above, each block may be divided into a high frequency component and a low frequency component based on the transform coefficient by the DCT. Since the operation at this time is the same as that of the third embodiment described above, the description thereof will be omitted.

Example 8. FIG. 11 is a block configuration diagram of another image information recording / reproducing processing apparatus of the present invention. In the recording processing system of FIG. 11, 80 is an input terminal for digital image data relating to image information to be recorded, 100 is an editing control terminal, 2 is an encoder, 3 is a modulator, and 13 is a reproducing side processing system. A demodulator, 12 is a decoder mainly composed of an error detection / correction circuit, 14 is a memory for storing digital data of an image in a predetermined period, 23 is a memory control circuit, and 90 is an output terminal of digital image data.

The recording operation will be described with reference to FIGS. 11 and 12. FIG. 12 illustrates a state of a track pattern formed by recording image information of one frame unit on a magnetic tape in this embodiment. In Figure 12 the truck
As in 31-35, to make the explanation easier to understand, 1
Although the image information of the frame is drawn so as to be composed of one track, it is actually the first field and the second field.
In most cases, each field is composed of one track, that is, two tracks in total. The number of tracks composed of image information of 1 field is 1 field 1
The track is not limited to the track, and may be recorded by being divided into a plurality of tracks by a known method such as multi-channel recording, multi-segment recording, or multi-channel multi-segment recording. further,
The image information of one frame may be composed of any number of tracks.

In FIG. 11, the encoder 2 to which the digital image data is input from the input terminal 80 divides the division information corresponding to each track of one frame into blocks, and detects an error at the time of reproduction for each block. A parity code for correction is added and a coded digital code including a sync code and an ID code is output to the modulator 3. The digital code input to the modulator 3 is converted into a signal suitable for recording and helically recorded on the magnetic tape via a recording head (not shown). FIG. 13 exemplifies one block in each helical track recorded on the magnetic tape. A plurality of one block composed of a synchronization code, an ID code, an image code, and a parity code is continuously recorded on the helical track. Has been done.

The state of recording tracks when recording is performed by assemble editing and insert editing in such a VTR will be described with reference to FIG. In Figure 14, edit I
New recording is performed by the edit IN from the beginning of the previously recorded one frame of image data Z located immediately before the N point, which will be described with reference to FIG. Figure 11
Edit I from the edit control terminal 100 of
When a signal for instructing the start of recording by N is given, the encoder 2 uses the memory included therein to output the image information of the first one frame twice in succession only in the first two frame periods immediately after the start of recording. From then on, image information for each frame that is continuously input in time series is output, and recording is executed via the modulator 3.

FIG. 15 shows the image information to be recorded immediately after the edit IN described above. FIG. 15A shows the input digital image data after the edit IN from the input terminal 80 in the order of A, B, C, ...
(B) shows the image data to be recorded output from the encoder 2 in the order of A, AR, B, C, ... In FIG. 15B, the AR is a frame (AR) in which the image data A of the first one frame is repeatedly recorded again.
= A), the frame B and subsequent frames are sequentially recorded one frame at a time.

In the recording track of FIG. 14, edit IN
The name of the image data of one frame unit of the track newly recorded after the point is designated by the same symbols A, AR, B, as in FIG. 15 (b).
It is indicated by C, .... Actually, each frame is composed of a plurality of tracks, but here it is intentionally expressed as one track in order to make the explanation easy to understand.

At this time, the digital code relating to the track A constituting at least the first frame A after the editing IN output from the encoder 2 is the start indicating the start of recording in the ID code for each block shown in FIG. The recording is performed so as to include the ID information. The start ID information is not limited to being recorded on the track forming the frame A, but may be any location as long as the edit IN point can be recognized as being recognized during reproduction, for example, the next frame AR. The start ID information may be recorded in the.

Next, an explanation will be given of the state of the processing for ending the recording which has been continued until the edit OUT point. When a signal for instructing the end of recording in the edit OUT is given from the edit control terminal 100 of FIG. 11 to the encoder 2, the encoder 2 outputs the last two signals immediately before the end of recording.
Only in the frame period, the same image information of one frame is output twice in succession, and the image information is input to the modulator 3 to perform recording, and the process is ended. FIG. 16 shows a recording track near the edit OUT point, and FIG. 17A shows the input digital image data immediately before the edit OUT from the input terminal 80 on a frame-by-frame basis.
In the order of J, K, and L, the image data to be recorded output from the encoder 2 is shown in FIG.
,, J, K, L, and LR are shown in the order of one frame.

LR in FIG. 17B is a frame (LR = L) in which the image data L of the last one frame is repeatedly recorded once, and in FIG. 16, recording is started on the recording track corresponding to these frames. The same frame name is used as in the case of time. In FIG. 16, the frame S and subsequent frames are the frames of the old track recorded before. In reality, each frame is composed of a plurality of tracks, but in order to make the description easy to understand, it is expressed as one track here.

At this time, the last frame L output from the encoder 2 is at least immediately before the edit OUT point.
The digital code relating to the track LR forming the R is recorded such that the ID code for each block shown in FIG. 13 includes end ID information indicating the end of recording. The end ID information is not limited to being recorded on the tracks forming the frame LR,
The end ID information may be recorded in any other area, such as a track forming the previous frame L, as long as the edit OUT point is reproduced.

Next, the operation during reproduction will be described with reference to FIG. The reproduced digital code from each track obtained by digitally demodulating the reproduced signal from the magnetic head by the demodulator 13 is input to the decoder 12. The decoder 12 performs error detection on each block of the reproduced image data using the parity code added by the encoder 2 at the time of recording, corrects any error, and if there is an uncorrectable error, The image data having no error is input to the memory 14 by making a correction such as replacing the pixel which cannot be corrected with a correct pixel around the pixel and synthesizing the data. The image data is stored in the memory 14 under the write control from the memory control circuit 23.

FIG. 18 shows an example of the internal structure of the memory 14 shown in FIG. 11. In this embodiment, for example, the memory 14 is composed of storage areas 141 to 144 for each frame, for a total of four frames. FIG. 19A shows the image data for each frame written in the memory 14 in time series in the vicinity of the edit IN point and the storage area in the memory 14 for storing them. Figure 19
In (a), the frames input to the memory 14 in chronological order ... X, Y, Z, A, AR, B, C ,.
Internal storage area ……, 141, 142, 143, 144, 141, 142
, 143, ... are sequentially stored one frame at a time.

Then, regarding the reproduced image data such as the above-described frames X and Y written in the memory 14, which corresponds to the other recording portion continuously recorded except immediately before and immediately after the edit IN point, The control signal 20 read from the regions 141 and 142 is given to the memory 14 with a delay of approximately one frame period from the time of writing. Digital image data read from the memory 14 and output to the output terminal 90 before the frame Z immediately before the editing IN described above is shown in FIG. 19B in frame units as ..., X, first Y. .

On the other hand, as described above, when the start ID information in the ID code added at the time of recording is reproduced on the track corresponding to the first recording frame A immediately after the edit IN point, the decoder 12 outputs the information shown in FIG. 19) shows the detection flag F1 which is almost synchronized with the writing timing of the frame A shown in FIG.
It is output as shown in (c). When the detection flag F1 is input to the memory control circuit 23, the image data of the frame Z corresponding to the last track previously recorded at the position immediately before the edit IN point stored in the area 143 in the memory 14 Outputs a control signal 20 to the memory 14 indicating that it is not read from the area 143 in the memory 14. That is, the last frame Z is not used as a reproduced image.

Similarly, the reproduced image data of the frame A recorded first immediately after the edit IN point stored in the area 144 of the memory 14 is controlled not to be read out,
Do not use it as a playback image. Then, as an alternative to the image data of the frames Z and A, the memory 14 is controlled so that the image data of the frame Y stored in the storage area 142 is read continuously for another two frame periods. The frame Y is read out only for three frame periods.

Then, as described above, the image data from the frame AR onward stored in the area 141 in the memory 14 is read from each of the storage areas 141 onward with a delay of approximately one frame period from the time of writing. Figure 19 (b)
The digital image data read out from the memory 14 and output to the output terminal 90 in the vicinity of the edit IN point described above are shown for each frame. Do not overlap. Further, FIG. 21A shows the state of the reproduced image in the vicinity of the edit IN point described above in the order of frames.

By the way, as described in the conventional description, the track corresponding to the frame Z located immediately before the edit IN point or the track corresponding to the frame A located immediately after the edit OUT point is shown in FIG. ) And (b), the track thinning or the same azimuth remaining is generally generated. Therefore, many errors are likely to occur in the reproduced digital code from the tracks of these frames Z and A. For this reason, the decoder
Opportunities for error correction and modification in 12 will be greatly increased, and the memory in which the output data of this decoder 12 is written
If the data corresponding to the frames Z and A is read from 14 as it is, the reproduced image deteriorates before and after the edit IN point,
This phenomenon becomes even stronger when the VTR is made narrower.

Therefore, as shown in FIG. 21 (a), unless the frames Z and A are used as reproduced images, the reproduced images will not deteriorate before and after the edit IN point. In addition, Y of the frame before the frame Z,
X, frames AR (= A), B, after frame A,
Since there is no concern about track thinning or the same azimuth remaining in C etc., there is no problem in using reproduced images of these frames.

Next, the processing in the vicinity of the edit OUT point will be described. FIG. 20A shows image data for each frame written in the memory 14 in time series in the vicinity of the edit OUT point and a storage area in the memory 14 for recording the image data. In FIG. 20 (a), the frames input to the memory 14 in time series are K, L, LR, S, T, U, ... Regions in the memory 14 ,. , 141, 14
One frame is sequentially stored in 2, ....

Then, it corresponds to the other recording portion continuously recorded except immediately before and after the edit OUT point,
For example, the above frames K and L written in the memory 14
For reproduction image data such as, the control signal 20 read from the areas 141 and 142 is given to the memory 14 with a delay of about one frame period from the time of writing. Output terminal 90 read from the memory 14 before the frame LR immediately before the edit OUT point
Figure 20 (b) shows the digital image data output to ...
, K, and the first L are shown in frame units.

On the other hand, the I added at the time of recording to the track corresponding to the last recording frame LR immediately before the edit OUT point.
When the end ID information in the D code is reproduced, the decoder 12 outputs the detection flag F2 almost in synchronization with the write timing of the frame LR shown in FIG. 20A as shown in FIG. 20C. When the detection flag F2 is input to the memory control circuit 23, the image data of the frame LR corresponding to the last track which has been recorded immediately before the edit OUT point stored in the area 143 in the memory 14 memory
The control signal 20 not to be read from the area 143 in 14 is output to the memory 14.

That is, the last frame LR is not used as a reproduced image. Similarly, memory
The reproduced image data of the previously recorded frame S is controlled so as not to be read out at a position immediately after the edit OUT point stored in the area 144 of 14 and is not used as a reproduced image. Then, as an alternative to the image data of the frames LR and S, the frame L stored in the storage area 142 is stored.
The memory 14 is controlled so as to read the image data of (1) for two more frame periods in succession, and if the first L is also included, the frame L is read for a total of three frame periods. Then, as described above, the image data from the frame T onward stored in the area 141 in the memory 14 is read out from the storage area 141 onward with a delay of approximately one frame period from the time of writing.

FIG. 20B shows, for each frame, digital image data read out from the memory 14 and output to the output terminal 90 in the vicinity of the edit OUT point described above.
Since the memory 14 has a storage capacity of 4 frames, writing and reading do not overlap. Fig. 21
The state of the reproduced image in the vicinity of the edit OUT point described above is shown in (b) in frame order. Note that there is no concern about track thinning or the same azimuth remaining in the frames L (= LR), K, J of the frame preceding the frame LR, and the frames T, U, V, etc. of the frame subsequent to the frame S. There is no problem in using the reproduced image.

As described above, the last frame Z previously recorded at the position immediately before the edit IN point and the frame S previously recorded at the position immediately after the edit OUT point and the first two frame periods immediately after the edit IN are included. The frame A of the recorded frames A and AR of the same image information is not used as a reproduced image, but the frame AR
Is used as reproduction image data, and therefore there is no reproduction frame image missing from the edit IN to the edit OUT.

In the eighth embodiment, it has been described that both the frames Z and A immediately before and after the edit IN point are not used, but only one of the frames may not be used. . That is, for example, by counting the number of error detections in the reproduction signal from the track corresponding to each frame at the time of reproduction, the number of errors detected in the last frame Z previously recorded at the position immediately before the edit IN point is often increased due to the track thinning. If the number of error detections of
Is not used as reproduction image information, but since the first frame A newly recorded immediately after the edit IN point has no track thinning, the number of error detections is small.
May be used as the reproduced image information. On the contrary,
The image information of the frame Z may be used and the frame A may not be used. Also, just before and immediately after the edit OUT point, it is possible to make it similar to the case of the edit IN point.

Example 9. In the eighth embodiment, the image information of the first frame immediately after the start of recording immediately after the edit IN point is continued for at least two frame periods, and the image information of one frame immediately before the end of recording at the edit OUT point is at least 2.
Although the image is continuously recorded for a frame period, the image data of the same frame is continuously recorded for two frame periods only at either the start of recording immediately after the edit IN point or the end of recording at the edit OUT point. Good.

That is, as shown in FIG. 2A, the track connection at the edit IN point and the track at the OUT point during edit recording is always track thin at the edit IN point.
If it is controlled so that the same azimuth remains at the UT point, as shown in FIG. 22 (a), the same image information of one frame is repeated twice only in the last two frame periods immediately before the end of recording at the edit OUT point. Continue recording, frame J, K,
The recording ends with L and LR (= L).

The digital code relating to the track forming the last frame LR at least immediately before the edit OUT point, which is output from the encoder 2, has the end code indicating the end of recording in the ID code for each block shown in FIG. Recording is performed so as to include the ID information. On the other hand, edit I
After the start of recording immediately after point N, frame A,
B, C ... Are recorded as they are in chronological order as they are, and at this time, the digital code relating to the track constituting at least the first frame A immediately after the editing IN, which is output from the encoder 2, includes the blocks shown in FIG. The recording is performed so that the ID code for each of them includes the start ID information indicating the start of the recording.

At the time of reproduction, the start ID information recorded on the track corresponding to the first recording frame A immediately after the editing IN is detected by the decoder 12 of FIG. 11 and input to the memory control circuit 23 as the detection flag F1. As a result, similar to the eighth embodiment, the reproduced image data is not used only for the frame Z corresponding to the old track in which the track narrowing previously recorded just before the edit IN point has occurred.
Then, the frame A recorded immediately after the edit IN point,
B, C, ... Are used as reproduced image data.

On the other hand, the end ID information recorded on the track corresponding to the last recording frame LR immediately before the edit OUT is also detected by the decoder 12 of FIG. 11 and input to the memory control circuit 23 as the detection flag F2. As a result, similar to the eighth embodiment, the reproduced image data is not used only for the frame LR corresponding to the track in which the same azimuth remaining that was recorded last just before the edit OUT point occurred.

The frames L, K, J, ... Recorded before the frame LR and the frames S, T, U, ... Recorded immediately after the edit OUT point are used as reproduced image data. To do. The reproduced image data used in the vicinity of the edit IN and the edit OUT described above are shown in frame order in FIG. In the present embodiment, the storage capacity of the memory 14 can be, for example, a total of 3 frames including the storage areas 141 to 143 for each frame.

As is clear from FIG. 22 (b), the edit IN
In the vicinity of, only the previously recorded frame Z is not used as a reproduced image, but the frames A, B, C, ... Newly recorded after IN are used without omission. Further, in the vicinity of the edit OUT, only the frame LR recorded last at the time of edit is not used, but L is the same information as the LR.
Reproduced image data of frames L, K, J, ... recorded before R, and frames S, T, U, ... recorded before the edit OUT point are used without omission. It Therefore, edit IN point and edit OUT
The reproduced image hardly appears to be deteriorated near the point. Further, there is no missing playback frame image from the edit IN to the edit OUT.

Example 10. Next, at the time of editing and recording, the track connection at the editing IN point and OUT point is shown in FIG.
As shown in FIG. 23B, if the same azimuth remains at the edit IN point and the track becomes thinner at the edit OUT point, the recording starts at the edit IN point as shown in FIG. Only in the first two frame periods immediately after that, the same image information of one frame is continuously recorded twice, and the recording is started at frames A, AR (= A), B, C .... At this time, at least immediately after the edit IN point, the digital code recorded on the first track constituting the frame A should include start ID information indicating the start of recording in the ID code for each block shown in FIG. And keep a record.

On the other hand, in edit OUT, a frame ...
The recording ends in the same order as J, K, and L in a time series, and at this time, at least the digital codes recorded in the track forming the last frame L immediately before the edit OUT point are the same as those shown in FIG. Recording is performed so that the ID code for each block includes end ID information indicating the end of recording.

At the time of reproduction, the start ID information recorded on the track corresponding to the first recording frame A immediately after the edit IN is detected by the decoder 12 of FIG. 11 and is input to the memory control circuit 23 as the detection flag F1. Thus, as in the case of the above-described eighth embodiment, the reproduced image data is not used only for the frame A corresponding to the track in which the same azimuth remaining first recorded immediately after the edit IN point occurs. Then, the previously recorded frame immediately before the edit IN point ... X, Y, Z and the frame AR (==) recorded after the frame A immediately after the edit IN point
A), B, C, ... Are used as reproduced image data.

On the other hand, the end ID information recorded on the track corresponding to the last recording frame L immediately before the edit OUT is also detected by the decoder 12 of FIG. 11 and is input to the memory control circuit 23 as the detection flag F2. Example 8
Similarly, immediately after the edit OUT point, the reproduced image data is not used only for the frame S corresponding to the previously recorded track in which the track narrowing has occurred.

Then, the newly recorded frames immediately before the edit OUT point ... J, K, L and the frames T, U, ... After the frame S recorded immediately after the edit OUT point are reproduced image data. Is used as. The reproduced image data used in the vicinity of the edit IN and the edit OUT described above are shown in frame order in FIG. 23 (b). In the present embodiment, the storage capacity of the memory 14 may be, for example, a total of 3 frames including the recording areas 141 to 143 for each frame.

As is clear from FIG. 23 (b), the edit IN
Only the first frame A recorded immediately after the point is not used as a reproduced image, but instead of the frame AR recorded after A as the same information as A, B, C, ...
Also, the reproduced image data for the frames previously recorded at the position immediately before the edit IN point ... X, Y, Z are used without omission.

Further, in the vicinity of the edit OUT point, the edit OUT
Only the first frame S previously recorded at the position immediately after the point is not used as a reproduced image, but the frame recorded immediately before the OUT point ... J, K, L and the frame S previously recorded after the edit OUT. The frame T behind,
Reproduced image data for U, ... Is used without omission. Therefore, the reproduced image hardly appears to be deteriorated near the edit IN and OUT. Further, there is no missing playback frame image from the edit IN to the edit OUT.

In Examples 8 and 9 and 10 above,
Although it has been described that the image information of the same frame is continuously recorded for two frame periods at the beginning immediately after the edit IN point or at the end immediately before the edit OUT point, the period of continuous recording is limited to two frames. is not. The storage capacity of the memory 14 and the memory control method are not limited to the above description.

Example 11. In Examples 8 and 9 and 10 described above, the image information of the first one frame is recorded twice in succession in the first two frame periods immediately after the edit IN.
Alternatively, in the last two frame periods immediately before the edit OUT, recording the same image information of one frame twice in succession is performed at the time of recording both or one of them. However, in this eleventh embodiment, the edit IN
Immediately after and immediately before edit OUT, the same frame is not continuously recorded. FIG. 24 shows the state of recording tracks when recording is performed by assemble editing and insert editing in the VTR of this embodiment.

In FIG. 24A, the vicinity of the edit IN is shown in FIG.
Although the vicinity of the edit OUT is shown in (b), here 1
It is assumed that the number of tracks corresponding to the image information of a frame is made up of a total of two tracks, one track for each of the first field and the second field, and the names given to each track respectively configure each frame. It matches the names of the first and second fields.

At the edit IN point shown in FIG. 24 (a),
New frames A and B by the edit IN after the image information shown in the track Z1 and the track Z2, which are composed of the first and second fields corresponding to the last frame Z previously recorded at the position immediately before IN. , C, ... are recorded. In FIG. 24 (a), A1 and A2 indicate tracks composed of the first field and the second field corresponding to the frame A, and the same applies to the following tracks B1 and B2, C1 and C2, and the like. The state of such edit IN will be briefly described with reference to FIG.

From the editing control terminal 100 shown in FIG. 11 to the encoder 2
In response to this, when a signal for instructing the start of recording by the edit IN is given, the encoder 2 inputs the edit I from the input terminal 80.
The image information A, B, C, ... For each frame that is continuously input in time series after N is output in that order.

FIG. 25 shows the image information to be recorded immediately after the editing IN point described above. FIG. 25 (a) shows the input digital image data after the edit IN point from the input terminal 80 in the order of A, B, C, ... For each frame. Correspondingly, the encoder 2 is shown in FIG. 25 (b). The digital code of the image data to be recorded output from the device is 1 in the order of A, B, C, ....
Shown in frame units.

The digital code output from the encoder 2 and corresponding to the track A1 or A2 constituting the frame A recorded at least immediately after the edit IN point is the ID code for each block shown in FIG. The start ID information indicating the start of recording is included. Figure
The digital code output from the encoder 2 shown in FIG. 25 (b) is converted into a signal of a form suitable for recording by the modulator 3 and recorded on a magnetic tape via a recording head (not shown).

Next, an explanation will be given of the state of processing at the end of the recording which has been continued until the edit OUT point. When a signal for instructing the end of recording at the edit OUT point is given from the edit control terminal 100 of FIG. 1 to the encoder 2, the encoder 2 inputs the digital image in 1 frame unit immediately before the edit OUT input from the input terminal 80. The data ..., J, K, L are output in that order, input to the modulator 3, and recording is completed. Figure 26 (a)
Indicates input digital image data immediately before editing OUT from the input terminal 80 in the order of J, K, L in 1 frame units. Correspondingly, the data output from the encoder 2 should be recorded in FIG. Digital code of image data ...
J, K, and L are shown in the order of one frame.

Further, the last frame L output from the encoder 2 is the recording end at least immediately before the edit OUT.
In the digital code corresponding to the track L1 or L2 constituting the above, the ID code for each block shown in FIG. 13 includes ID information indicating the end of recording.

In the recording track near the edit OUT of FIG. 24B, K1 and K2 correspond to the first and second fields of the frame K, and L1 and L2 correspond to the first and second fields of the last frame L of the edit OUT. It is a truck to do. Also, in FIG. 24 (b), tracks S1 and S2
Are tracks corresponding to the first field and the second field of the previously recorded frame S.

Next, the operation during reproduction will be described with reference to FIG. The reproduced digital code from each track obtained by digitally demodulating the reproduced signal from the magnetic head by the demodulator 13 is input to the decoder 12. The decoder 12 uses the parity code added by the encoder 2 at the time of recording to perform error detection on each block of the reproduced image data, corrects any error, and if there is an uncorrectable error, Make corrections such as replacing with data synthesized from correct pixels around the pixels that could not be corrected,
Image data having no error is input to the memory 14. Memory 14
In the above, these image data are stored by the write control from the memory control circuit 23.

FIG. 27 shows an example of the internal structure of the memory 14 shown in FIG. 11. In this embodiment, for example, it is composed of a total of four fields consisting of storage areas 141 to 144 for each one field. In FIG. 28 (a), the memory 14 near the edit IN point is displayed.
2 shows image data for each field written in chronological order and a storage area in the memory 14 for storing them. Figure 28
In (a), for example, fields that are input to the memory 14 in chronological order near the edit IN point, ..., Y2, Z1, Z
2, A1, A2, B1, B2, ... Are storage areas in the memory 14, ..., 141, 142, 143, 144, 141, 142, 143 ,.
Are sequentially stored in each field.

Then, for example, the above-mentioned fields Y2 and Z written in the memory 14, which correspond to other recording portions which are continuously recorded except immediately before and immediately after the edit IN point.
For the reproduced image data of No. 1, the areas 141 and 142 are delayed by about two field (one frame) period from the time of writing.
The control signal 20 to be read from the memory 14 is given to the memory 14. The memory 14 is set before the field Z2 immediately before the edit IN point described above.
The digital image data read from the output terminal 90 and output to the output terminal 90 is shown in FIG. 28 (b) in field units as Y2, first Z1.

By the way, as described in the description of the conventional example, a track corresponding to the frame Z located immediately before the edit IN, particularly the track Z2 of the last second field thereof, or a new record is made immediately after the edit IN. In the track corresponding to the frame A, in particular, the track A1 in the first first field thereof, the track thinning or the same azimuth remaining as shown in FIG. 2A or 2B is generally generated. .

Therefore, many errors are likely to occur in the reproduced digital code from the tracks of these frames Z and A. Therefore, the chances of error correction and correction in the decoder 12 are greatly increased, and if the data corresponding to the frames Z and A is read out from the memory 14 in which the output data of the decoder 12 is written, The reproduced image deteriorates before and after the IN point, and this phenomenon becomes even stronger when the VTR is narrowed.

Therefore, as described above, at least the track A corresponding to the first recording frame A immediately after the edit IN point is recorded.
When the start ID information in the ID code added at the time of recording to 1 is reproduced, the detection flag F1 shown in FIG. It is output as in c). When the detection flag F1 is input to the memory control circuit 23, the last frame Z previously recorded at the position immediately before the edit IN point stored in the storage area 143 in the memory 14 is recorded.
The image data of the second field reproduced from the track Z2 of the second field corresponding to the above is not read from the area 143 in the memory, but instead, the image data of the first field from the track Z1 of the previous first field is read. The memory 14 is controlled by the control signal 20 so as to continuously read the image data from the storage area 142 for another field period. When the first Z1 is also included, the field Z1 is read for a total of two field periods.

For the frame A first recorded immediately after the edit IN point, the image data of the first field reproduced from the track A1 of the first field corresponding thereto is stored in the memory area 144 in the memory. The control is such that the image data for the second field from the track A2 of the second field after that is read out from the storage area 141 in the memory 14 continuously for two field periods with a delay of one field period from the time of writing. The signal 20 is output to the memory 14.

As described above, the image data from the field B1 onward stored in the area 142 in the memory 14 is delayed from the storage area 142 onward by approximately two field (1 frame) period with respect to the writing time. Read from. The digital image data read from the memory 14 and output to the output terminal 90 near the edit IN point described above is shown in FIG. 28B in field units. Since the memory 14 has a storage capacity of 4 fields, writing and reading do not overlap. Further, FIG. 30A shows the reproduced image data used near the edit IN point described above in the order of fields.

As a result, with respect to the last frame Z previously recorded at the position immediately before the edit IN point and the frame A first recorded immediately after the edit IN point, the resolution in the vertical direction as a reproduced image is recorded. 1/2 when I did
Decrease to. However, in most cases, there is no correlation between the frame Z and the frame A, which have different recording opportunities, and the resolution is reduced by half only in the period of one frame before and after the edit IN point. Even if the resolution in the vertical direction is halved in one frame before and after the IN point, the deterioration of the image quality is hardly perceived.

Next, the processing in the vicinity of the edit OUT point will be described. FIG. 29A shows image data for each frame written in time series in the memory 14 near the edit OUT point and a storage area in the memory 14 for storing them. Figure
In 29 (a), for example, the fields input to the memory 14 in chronological order near the edit OUT point, ..., K2, L
1, L2, S1, S2, T1, T2, ... are areas in the memory 14, 141, 142, 143, 144, 141, 142, 143 ,.
Are sequentially stored in each field.

Then, the above-mentioned fields K2 and L written in the memory 14, for example, corresponding to other recording portions continuously recorded except immediately before and after the edit IN point are recorded.
For the reproduced image data of No. 1, the areas 141, 1 are delayed by about two fields (one field) from the time of writing.
The control signal 20 read from 42 is given to the memory 14. The digital image data read from the memory 14 and output to the output terminal 90 before the field L2 immediately before the edit OUT point described above is shown in FIG. 29 (b) ..., K2, field by field as the first L1. Show.

By the way, the track corresponding to the frame L which has been recorded immediately before the edit OUT, particularly the track L2 of the last second field thereof, or the track corresponding to the frame S previously recorded at the position immediately after the edit OUT. , Especially the first field S1 track S1
However, in general, the track thinning or the same azimuth remaining as shown in FIG. 2A or 2B occurs. Therefore, as in the case of the above edit IN, edit O
When the end ID information added at the time of recording is reproduced on at least the track L2 corresponding to the last recording frame L that has been recorded just before the UT point, the decoder 12 outputs the information shown in FIG.
The detection flag F2, which is almost in synchronism with the writing timing of the field L2 shown in (a) to the memory, is output as shown in FIG. 29 (c).

When the detection flag F2 is input to the memory control circuit 23, the second field corresponding to the last frame L stored in the storage area 143 of the memory 14 just before the edit OUT point is stored. The image data for the second field reproduced from the track L2 of No. 1 is not read out from the area 143 in the memory, but is instead read from the first field before that.
The memory 14 is controlled by the control signal 20 that the image data for the first field from the track L1 of the field is continuously read from the recording area 142 for another field period.
When the first L1 is also included, the field L1 is read out for a total of two field periods.

As for the frame S previously recorded at the position immediately after the edit OUT point, the image data for the first field reproduced from the track S1 of the first field corresponding to the frame S is stored in the memory 14. Area 14
The image data for the second field from the subsequent track S2 of the second field is not read out from
Memory with a delay of approximately one field period when writing
A control signal 20 for reading continuously from the storage area 141 in 14 for two field periods is output to the memory 14.

Then, as described above, the image data from the field T1 onward stored in the area 142 in the memory 14 is delayed from the storage area 142 by about 2 field (1 frame) period with respect to the writing time. Read from. The digital image data read from the memory 14 and output to the output terminal 90 near the edit OUT point described above is shown in FIG. 29B in field units.
Further, FIG. 30B shows the reproduced image data used near the edit OUT point described above in the order of fields.
The storage capacity of the memory 14 and the memory control method are not limited to the above description.

As a result, regarding the last frame L that has been recorded immediately before the edit OUT point and the frame S that was previously recorded at the position immediately after the edit OUT point, the vertical resolution of the reproduced image is It is reduced to 1/2. However, there is almost no correlation between the frame L and the frame S that have different recording opportunities,
Since the resolution is halved only in the period of only one frame before and after the edit OUT point, even if the resolution in the vertical direction is halved in the one frame before and after the edit OUT, the deterioration of the image quality is hardly perceived.

Example 12. In the reproducing process of the eleventh embodiment, the reproduced image data corresponding to the first field of the frame A recorded first immediately after the edit IN point is reproduced from the track A2 behind the track A1. It is replaced by the image data A2 of the field. Also for the frame S previously recorded at the position immediately after the edit OUT point, the reproduced image data corresponding to the first field is replaced with the image data S2 of the second field reproduced from the track S2 behind the track S1. ing.

However, at the time of reproduction of this embodiment, FIG.
The image data Z1 of the first field from the track Z1 of the first field corresponding to the last frame Z previously recorded at the position immediately before the edit IN point in (a) is replaced with the second field of the frame Z. The data is used as data to be replaced with the first field of the new frame A immediately after the editing IN.
Then, as the image data of the second field of the frame A, the reproduced image data A2 from the second field track A2 of the frame A originally recorded is used. FIG. 31A shows the reproduced image data used in the vicinity of the edit IN in the present embodiment described above in the order of fields.

Further, the editing OU at the time of reproduction of this embodiment
In the vicinity of T, the image data L1 of the first field from the track L1 of the first field corresponding to the last frame L which has been recorded at the edit OUT point in FIG.
Is used as data to substitute for the second field of the frame L, and is also used as data to substitute for the first field of the frame S immediately after the edit OUT. Then, as the image data of the second field of the frame S, the reproduced image data S2 from the second field track S2 of the frame S originally recorded is used. FIG. 31 (b) shows the reproduced image data used near the edit OUT in the present embodiment described above in the order of fields.

As described above, in the edit IN of this embodiment, the original first field information A1 in the frame A is recorded.
Is not used at the time of reproduction, but the information A2 of the second field, which generally has a large correlation with the first field at the time of recording, is used as reproduced image data, so the content of the first frame A newly recorded after the editing IN is recognized. be able to. Even if the image data Z1 corresponding to the first field corresponding to the last frame Z previously recorded at the position immediately before the edit IN point is used as the data to replace the first field of the frame A, there is no opportunity to record it. Different frame Z
In most cases, there is originally no image correlation between the frame A and the frame A, so that the frame A at the time of reproduction is Z1 and A2.
Even if it is composed of the first and second fields consisting of, the discomfort is hardly sensed.

Furthermore, since the Z1 image data is used in both the first and second fields as the reproduced image data of the last frame Z previously recorded at the position immediately before the edit IN point, the vertical resolution is recorded. Although it is reduced to ½ of that of the above case, the deterioration of the image quality is hardly perceived because it is only this one frame period. The above description holds true before and after the edit OUT shown in FIG. 31 (b).

Incidentally, in the above-mentioned Example 12, FIG.
As the reproduced image data to replace the second field Z2 of the last frame Z previously recorded at the position immediately before the edit IN point shown in (a), for example, the first frame A newly recorded immediately after the edit IN is recorded. Even if the field image information in the frame after the editing IN such as the second field A2 is used, the same effect as the twelfth embodiment can be obtained. At this time,
The first of the first frame A newly recorded immediately after the edit IN
The image information of the second field A2 of the first frame A newly recorded immediately after the edit IN is also used as the reproduced image data to replace the field A1.

Similarly, as the reproduced image data which substitutes for the second field L2 of the last frame L which has been recorded at the position immediately before the edit OUT point shown in FIG. Even if the field image information in the frame after the edit OUT such as the second field S2 of the recorded first frame S is used,
Has the same effect as. At this time, even if the reproduced image data is substituted for the second field L2 of the last frame L that has been recorded at the position immediately before the edit OUT point, the second field S2 of the first frame S previously recorded at the position immediately after the edit OUT is also used. Use the image information of.

Further, at the time of recording in the above eleventh and twelfth embodiments, the number of recording tracks for each field is not limited to one track as shown in FIG. It may be. Further, the field corresponding to the last track of the plurality of tracks forming one frame does not necessarily have to be limited to the second field as shown in FIG. 24, and the first field is determined to correspond. It may be a recording format.

Further, in the above eighth to twelfth embodiments, the recording / reproducing system block of the digital VTR has been described with the configuration of FIG. 11, but the configuration shown in FIG. 32 may be used. The difference between FIG. 11 and FIG. 32 is that the recording system has a high-efficiency encoder 51.
And the recording data rate for the digital image data input to the input terminal 80 is reduced, and the recording operation described in Embodiments 8 to 12 is performed. In response to this, the reproducing system performs the reproducing operation described in the above-mentioned eighth to twelfth embodiments, and the high-efficiency decoder 61 is used to input the input terminal during recording.
The digital image data in the form input to 80 is restored and output to the output terminal 90.

With the configuration shown in FIG. 32, the memory 14
The storage capacity of or the storage capacity of the memory included in the encoder 2 can be reduced as compared with the case of FIG.
The same effects as those of Examples 8 to 12 can be obtained.
As the high-efficiency coding method, various methods such as transform coding such as discrete cosine transform (DCT) can be applied.

Further, although the case of the digital VTR has been described in the above eighth to twelfth embodiments, not only the digital recording system but also the analog recording system VTR can be applied.

[0161]

As described above, according to the first image information recording / reproducing apparatus of the present invention, the image information for one fixed period (frame or field) is composed of a plurality of tracks, and the plurality of recording tracks are recorded. One or both of the first track and the last track of the inside are allocated and recorded with information mainly consisting of high frequency components in image information for one period, and assemble editing,
In the edit mode such as the insert edit, the edit IN point and the edit OUT point are configured in units of image information for one period, and the track immediately before and after the edit IN point and immediately before and immediately after the edit OUT point are reproduced. As for a plurality of tracks of image information units for one period other than the image information for one period which includes the same as the case where the error correction and correction results regarding the reproduction signal from this track are used as they are. For the tracks immediately before and after the edit IN point where the track thinning or the same azimuth remaining occurs, and immediately before and after the edit OUT point, the error correction and correction results of the reproduced signals from those tracks are used as they are. Originally, the information mainly including the high frequency component in the image information for one period was recorded on those tracks. Even as the frequency of occurrence of error correction and concealment increased reproduction signal from those tracks, edit IN point immediately before, immediately after and edit OUT point immediately before, seldom appear to playback quality is degraded immediately after.

According to the second image information recording / reproducing apparatus of the present invention, the image information of one fixed period (frame or field) is composed of a plurality of tracks, and the first track among the plurality of recording tracks. In one or both of the last track and the last track, information mainly composed of high-frequency components in the image information for one period is assigned and recorded, and in the edit mode such as assemble edit and insert edit, The edit IN point and the edit OUT point are configured in units of image information for one period, and immediately before, immediately after, and the edit OUT point of the edit IN point during reproduction.
As a result of error correction or modification relating to the reproduction signal from this track for a plurality of tracks in the image information unit for one period other than the image information for one period including the tracks immediately before and after the point Although it is used as it is,
At least immediately before and after the edit IN point at which track thinning or the same azimuth remaining occurs, and immediately before the edit OUT point,
For the tracks immediately after that, the results of error correction and correction for the reproduced signals from those tracks are not used, but the information originally composed of high-frequency components in the image information for one period is originally recorded on those tracks. Therefore, even if it is not used, the reproduced image quality hardly appears immediately before and after the edit IN point and immediately before and after the edit OUT point.

According to the third image information recording / reproducing apparatus of the present invention, the image information of one fixed period (frame or field) is composed of a plurality of tracks, and the first track among the plurality of recording tracks. In one or both of the last track and the last track, information mainly consisting of high-frequency components in the image information for one period is assigned and recorded, and in the edit mode such as assemble edit and insert edit, The edit IN point and the edit OUT point are configured in units of image information for one period, and immediately before, immediately after, and the edit OUT point of the edit IN point during reproduction.
As a result of error correction and modification relating to the reproduction signal from this track for a plurality of tracks in the image information unit for one period other than the image information for one period including the tracks immediately before and after the point Is used as it is, and at least immediately before and after the edit IN point at which track thinning or the same azimuth remaining occurs, immediately before and immediately after the edit OUT point, according to the error occurrence frequency of the reproduction signal from the track, Since it is determined whether or not to use the result of error correction and modification relating to the reproduced signal, the reproduced image quality hardly appears immediately before and after the edit IN point, immediately before and immediately after the edit OUT point.

Further, according to the fourth image information recording / reproducing apparatus of the present invention, the reproduction signals from the tracks immediately before and immediately after the edit IN point and immediately before and after the edit OUT point are generated due to the track thinning or the same azimuth remaining. Even if many errors occur and the frequency of error correction and modification increases, the results of error correction and modification of image information for one period corresponding to those tracks are not used as reproduced image data. Immediately before and after the IN point, and immediately before the edit OUT point,
Immediately after that, the playback image quality does not appear to deteriorate.

Further, according to the fifth image information recording / reproducing apparatus of the present invention, the last track immediately before the edit IN point where the track thinning occurs and the edit O where the same azimuth remaining occurs.
Since the result of error correction and modification of the image information for one period corresponding to the last track just before the UT point is not used as the reproduced image data, the reproduced image quality immediately before and after the edit IN point and immediately before and after the edit OUT point Does not appear to deteriorate. Furthermore, as the missing playback image,
It is possible to limit to only the image information for the last one period previously recorded at the position immediately before the edit IN point.

Further, according to the sixth image information recording / reproducing apparatus of the present invention, the first track immediately after the edit IN point where the same azimuth remains and the edit O where track thinning occurs.
Since the result of error correction and modification of the image information for one period corresponding to the first track immediately after the UT point is not used as the reproduced image data, the reproduced image quality immediately before and after the edit IN point, immediately before and immediately after the edit OUT point Does not appear to deteriorate. Furthermore, as the missing playback image,
It is possible to limit to only the image information for the last one period which has been previously recorded at the position immediately before the edit OUT point.

Further, according to the seventh image information recording / reproducing apparatus of the present invention, the reproduced image data of the last frame previously recorded at the position immediately before the edit IN point is the first and the second.
Reproduction image data of any one field in this frame is assigned to each field, and reproduction image data of the first frame immediately after the edit IN point is reproduced in any one field in this frame. Image data is assigned, and as the playback image data of the last frame that has been recorded just before the editing OUT point, the playback image data of any one field in this frame is assigned and edited for both the first and second fields. Immediately before the edit IN point, since the reproduced image data of any one field in this frame is assigned to both the first and second fields as the reproduced image data of the first frame previously recorded at the position immediately after the OUT point. Playback image quality immediately after and immediately before and after the edit OUT point It never appears to deteriorate, further, the reproduced image the entire frame is lost does not occur.

Further, according to the eighth image information recording / reproducing apparatus of the present invention, the reproduction image data of the last frame previously recorded at the position immediately before the edit IN point is the first and the second.
Reproduction image data of any one field in this frame is assigned to each field, and reproduction image data of the first frame immediately after the edit IN point is recorded in the position immediately before the edit IN point, for example, in the first field. Reproduction image data of any one field in the last frame is assigned, reproduction image data of any one field in the first frame immediately after the edit IN point is assigned to the second field, and
As the reproduction image data of the last frame which has been recorded immediately before the edit OUT point, the reproduction image data of any one field in this frame is assigned to both the first field and the second field, and the reproduction image data before the edit OUT point is previously allocated. As the reproduced image data of the recorded first frame, for example, the first field is assigned the reproduced image data of any one of the fields in the last frame recorded immediately before the edit OUT point, and the second field is the edit OUT. Since the reproduced image data of any one field in the previously recorded first frame is assigned to the position immediately after the point, the reproduced image quality appears to be deteriorated immediately before and after the edit IN point, immediately before and immediately after the edit OUT point. In addition, a reproduced image in which the entire one frame is missing does not occur.

[Brief description of drawings]

FIG. 1 is a block diagram of a conventional image information recording / reproducing apparatus.

FIG. 2 is a diagram showing a recording track state during editing in a conventional image information recording / reproducing apparatus.

FIG. 3 is a block configuration diagram of an image information recording / reproducing apparatus of the present invention.

FIG. 4 is a diagram showing a plurality of recording tracks composed of image information of one frame in the present invention.

FIG. 5 is a diagram showing a data structure for each block on each recording track in the present invention.

FIG. 6 is a diagram showing a recording track state during editing in the present invention.

FIG. 7 is a diagram showing a recording track state at the time of editing in the present invention.

FIG. 8 is a diagram for explaining information having a high frequency component as a main component and information having a low frequency component as a main component according to the present invention.

FIG. 9 is a block configuration diagram of another image information recording / reproducing apparatus of the present invention.

FIG. 10 is a diagram showing a data structure for each block on each recording track in the present invention.

FIG. 11 is a block configuration diagram of still another image information recording / reproducing apparatus of the present invention.

FIG. 12 is a diagram showing a recording track composed of one frame of image information according to the present invention.

FIG. 13 is a diagram showing a data structure for each block on each recording track in the present invention.

FIG. 14 is a diagram showing a recording track state in the vicinity of edit IN in the present invention.

FIG. 15 is a diagram for explaining a recording frame near an edit IN in the present invention.

FIG. 16 is a diagram showing a recording track state in the vicinity of edit OUT according to the present invention.

FIG. 17 is a diagram for explaining a recording frame in the vicinity of edit OUT according to the present invention.

FIG. 18 is a diagram showing a configuration of a reproduction system memory in the present invention.

FIG. 19 is a diagram for explaining the write / read timing in the memory of the reproducing system near the edit IN point according to the present invention.

FIG. 20 is a diagram for explaining writing / reading timing in the memory of the reproducing system near the edit OUT point in the present invention.

FIG. 21 is a view of edit IN vicinity and edit OUT according to the present invention.
FIG. 6 is a diagram showing reproduced image data in the vicinity in frame units.

FIG. 22 is a diagram showing the vicinity of edit IN and edit OUT according to the present invention.
FIG. 3 is a diagram showing a recording track state and reproduced image data in the vicinity in frame units.

FIG. 23 is a view of edit IN vicinity and edit OUT according to the present invention.
FIG. 3 is a diagram showing a recording track state and reproduced image data in the vicinity in frame units.

FIG. 24 is a view of edit IN vicinity and edit OUT according to the present invention.
It is a figure which shows the recording track state in the vicinity.

FIG. 25 is a diagram for explaining a recording frame in the vicinity of the edit IN according to the present invention.

FIG. 26 is a diagram for explaining a recording frame in the vicinity of the edit OUT according to the present invention.

FIG. 27 is a diagram showing a structure of a reproduction system memory in the present invention.

FIG. 28 is a diagram for explaining the write / read timing in the memory of the reproducing system near the edit IN point according to the present invention.

FIG. 29 is a diagram for explaining writing / reading timing in the memory of the reproducing system near the edit OUT point in the present invention.

FIG. 30 is a view of edit IN vicinity and edit OUT according to the present invention.
FIG. 6 is a diagram showing reproduced image data in the vicinity in frame units.

FIG. 31 is a diagram showing the vicinity of edit IN and the edit OUT according to the present invention.
FIG. 6 is a diagram showing reproduced image data in the vicinity in frame units.

FIG. 32 is a block configuration diagram of still another image information recording / reproducing apparatus of the present invention.

[Explanation of symbols]

 1 data division circuit 2 encoder 3 modulator 12 decoder 13 demodulator 14 memory 15 data synthesis circuit 21 error counting circuit 22 memory control circuit 23 memory control circuit 51 high-efficiency encoder 61 high-efficiency decoder

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[Procedure amendment]

[Submission date] May 27, 1993

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] 0131

[Correction method] Change

[Correction content]

Next, an explanation will be given of the state of processing at the end of the recording which has been continued until the edit OUT point. When a signal for instructing the end of recording at the edit OUT point is given from the edit control terminal 100 in FIG. 11 to the encoder 2, the encoder 2 inputs the digital image in 1 frame unit immediately before the edit OUT input from the input terminal 80. The data ..., J, K, L are output in that order, input to the modulator 3, and recording is completed. Figure 26 (a)
Indicates input digital image data immediately before editing OUT from the input terminal 80 in the order of J, K, L in 1 frame units. Correspondingly, the data output from the encoder 2 should be recorded in FIG. Digital code of image data ...
J, K, and L are shown in the order of one frame.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification code Office reference number FI technical display location H04N 5/93 Z 4227-5C

Claims (10)

[Claims] 1. At the time of recording, image information for one period is composed of a plurality of tracks, and among the first track and the last track among the plurality of tracks composed of the image information for one period. One or both of the tracks are assigned as tracks relating to information having high frequency components as main components in the image information for one period, and a track in which information having mainly high frequency components in the plurality of tracks is recorded. The remaining tracks except the above are allocated as tracks relating to information mainly consisting of low-frequency components in the image information for the one period, and recording is performed in image information units for the one period. Information recording / reproducing apparatus. 2. The information mainly composed of the high-frequency component and the information mainly composed of the low-frequency component in the image information for one period is relatively high-frequency component in each block subjected to transform coding. The image information recording / reproducing apparatus according to claim 1, wherein the image information recording / reproducing apparatus is configured by the block having a large number of blocks and the block having a relatively large number of low frequency components. 3. At the time of reproduction, it goes without saying that the information mainly composed of the low frequency component in the image information for one period reproduced for each of the plurality of tracks, which is composed of the image information for one period. 2. The image information recording / reproducing apparatus according to claim 1, wherein the information mainly composed of the high frequency component is always used without omission, and is restored to the image information in a fixed period unit at the time of recording. . 4. At the time of reproduction, the information mainly composed of the low frequency component in the image information for one period reproduced for each of the plurality of tracks which is composed of the image information for one period is always It is characterized in that it is used, and the information mainly consisting of the high frequency component in the image information for one period is not always used, and is restored to the image information in one fixed period unit at the time of recording. The image information recording / reproducing apparatus according to claim 1. 5. At the time of reproduction, the information mainly composed of the low frequency component in the image information for one period reproduced in the unit of a plurality of tracks which is composed of the image information for one period is always For the information that is mainly composed of the high frequency component in the image information for one period, determines whether or not to use the information mainly composed of the high frequency component according to an error occurrence frequency of the information,
The image information recording / reproducing apparatus according to claim 1, wherein the image information recording / reproducing apparatus is configured to restore the image information in a unit of a fixed period at the time of recording. 6. At the time of recording including editing recording, recording is performed in units of image information of one fixed period (one frame), but is the same only in the first plural frame period immediately after the start of recording (edit IN point). The image information of one frame is continuously recorded a plurality of times, and when the recording is completed, the recording is completed (edit O
(UT point) The same image information of one frame is continuously recorded a plurality of times only in the last plural frame periods immediately before, and at the time of reproduction, immediately before, immediately after the edit IN point and edit OUT.
The image information for one other period which is continuously recorded except for the portion immediately before and immediately after the point is used, but at least immediately before the edit IN point is recorded at the position immediately before the IN point. Image information or edit I for the last one period
Immediately after the N point, either one or both of the image information for at least the first one period newly recorded immediately after the IN point is not used, and immediately before the edit OUT point is recorded immediately before the OUT point. Use at least one of the image information for at least the last one period that has ended, or at least immediately after the edit OUT point, the image information for at least the first one period previously recorded at the position immediately after the OUT point. The image information recording / reproducing apparatus is characterized in that the image information is restored to the image information in a fixed period unit at the time of recording. 7. At the time of recording including editing recording, recording is performed in units of image information of one fixed period (one frame), but at the end of recording, the last plural numbers immediately before the end of recording (edit OUT point) are recorded. The same image information of one frame is continuously recorded a plurality of times only during the frame period, and at the time of reproduction, immediately before, immediately after, and immediately after the recording start (edit IN point).
The image information for one period which is continuously recorded except for the portion immediately before and immediately after the T point is used, but the portion immediately before the edit IN point has been previously recorded at the position immediately before the IN point. At least the image information for the last one period is not used, and the OU immediately before the edit OUT point is used.
An image information recording / reproducing apparatus characterized in that the image information is restored to the image information of one fixed period unit at the time of recording, without using only the image information for at least the last one period which has been recorded just before the T point. . 8. When recording, including editing recording, recording is performed in image information units of one fixed period (one frame), but is the same only in the first plurality of frame periods immediately after the start of recording (edit IN point). The image information of one frame is continuously recorded a plurality of times, and at the time of reproduction, it is continuously recorded except immediately before and after the edit IN point and immediately before and after the end of recording (edit OUT point). Although the image information for the other one period is used, immediately after the edit IN point, only the image information for at least the first one period newly recorded immediately after the IN point is not used. Immediately after that, at the position immediately after the OUT point, only the image information for at least the last one period previously recorded is not used, and the image information is restored to the image information in one fixed period at the time of recording. And an image information recording / reproducing apparatus. 9. When recording including editing and recording, recording is performed in image information units of one frame each of which is composed of at least one track in each of the first field and the second field, and in reproduction, Immediately before and after the start of recording (Edit IN point) and the end of recording (Edit OUT point)
The image information of one frame unit which is continuously recorded except the portion immediately before and immediately after is used, but the one frame corresponding to the last track previously recorded at the position immediately before the edit IN point is used. Do not use the image information of either one of the first or second field in the
As an alternative, the same image information as the image information of the other field corresponding to the track preceding the last track is used, and one frame corresponding to the first track immediately after the edit IN point is used. The image information of one of the first and second fields is not used, and instead, the same image information as the image information of the other field corresponding to the track after the first track is used. And similarly edit OUT
1 that corresponds to the last track that was recorded just before the point
The image information of one of the first and second fields in the frame is not used, and instead, it is the same as the image information of the other field corresponding to the track preceding the last track. Use the image information, and do not use the image information of either one of the first and second fields in one frame corresponding to the first track previously recorded immediately after the edit OUT point. Instead, using the same image information as the image information of the other field corresponding to the track behind the first track as an alternative,
An image information recording / reproducing apparatus, which is configured to restore image information of one frame unit at the time of recording. 10. When recording including editing and recording, recording is carried out in image information units of one frame each of which is composed of at least one track in each of the first field and the second field, and in reproduction, The image information of one frame unit which is continuously recorded except the portion immediately before and after the edit IN point and immediately before and after the edit OUT point is used, but it has been previously recorded at the position immediately before the edit IN point. 1st in 1 frame that corresponds to the last track of
Alternatively, the image information of one of the second fields is not used, and instead, the same image information as the image information of the other field corresponding to the track ahead of the last track is used. , Which corresponds to the first track immediately after the edit IN point 1
The image information of one of the first and second fields in the frame is not used, and instead, the same image information as the image information of the other field immediately before the edit IN point is used. In addition, the image information of either one of the first and second fields in one frame corresponding to the last track recorded just before the edit OUT point is not used, and the last track is used instead. The same image information as the image information of the other field corresponding to the preceding track is used, and in one frame corresponding to the first track previously recorded at the position immediately after the edit OUT point. The image information of one of the first and second fields is not used, and the edit OUT is used instead of the image information. Using the same image information and the image information of the other field immediately before, during recording 1
An image information recording / reproducing apparatus, which is configured to restore image information in frame units.