JPH06217247A - Still video device - Google Patents

Abstract

PURPOSE:To record image signals which constitute one screen on plural tracks even unless there are plural free tracks left and to generate one screen by reproducing those tracks. CONSTITUTION:On tracks which have the same head track recorded in their ID code areas, image signals constituting the same screen are stored. Then ID codes are decoded (step 401) and the head track numbers are stored in a memory (step 402). When the head track number of a track matches a head track stored in the memory, the image signal of the track is stored in a specific area of the memory according to a constitution screen number (step 406). Steps 404-409 are repeated and after all image signals constituting one screen are reproduced (step 407), images are read out of the memory in the order of areas and a reproduced image is outputted on a monitor (step 411).

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a still video device for reproducing a recording medium such as a magnetic disk in which image signals corresponding to one screen are recorded on a plurality of tracks.

[0002]

2. Description of the Related Art A conventional still video device is configured to FM-modulate an input image signal and record it.
The band of the signal recorded on the track of the magnetic disk is fixed. The width of this band is limited due to the structure of the disk device, and cannot be increased without limit. For this reason, in the conventional still video apparatus, even if a high-quality or wide-band image signal is input to the still video apparatus, the resolution of the image is limited, and particularly when this image is printed out, the image quality is significantly deteriorated. .

Therefore, the present applicant has filed Japanese Patent Application No. 3-26810.
In No. 4, in order to obtain a high quality image without changing the band of the image signal recorded on a recording medium such as a magnetic disk, the image signal corresponding to one screen is divided into a plurality of memories. A still video device has been proposed in which one or all of the image signals of the plurality of image signals are expanded in the time axis and recorded on a plurality of tracks of a recording medium.

[0004]

However, in the conventional still video apparatus, when dividing an image signal forming one screen and recording it on a plurality of tracks, it is necessary that empty tracks exist continuously. If a plurality of empty tracks do not exist adjacent to each other, it is impossible to record such an image signal.

According to the present invention, an image signal forming one screen can be recorded on a plurality of tracks even if a plurality of empty tracks do not exist continuously, and further such a plurality of tracks can be reproduced. It is an object of the present invention to obtain a still video device capable of forming a single screen.

[0006]

According to a first still video apparatus of the present invention, I of each track of a recording medium in which an image signal corresponding to one screen is recorded over a plurality of tracks.
A configuration for storing screen identification information storage means for storing information for identifying a screen in the area for recording the D code, and a configuration screen number indicating the correspondence between the image signal and the screen in the area for recording the ID code. A screen number storage means, a means for storing an image signal in a predetermined area of the memory based on the screen identification information and the constituent screen number stored in each track of the recording medium, and a predetermined image signal stored in the memory. And a reproducing means for forming one screen.

The second still video apparatus according to the present invention further comprises means for dividing an image signal corresponding to one screen into a plurality of pieces and storing the divided image signal in the first memory, and a recording medium for expanding the image signal on the time axis. , A screen identification information storage means for storing information for identifying a screen in an area for recording the ID code of each track on which the image signal is recorded, and the ID code for recording. In the area to
Based on the configuration screen number storage means for storing the configuration screen number indicating the correspondence between the image signal and the screen, and the screen identification information and the configuration screen number stored in each track of the recording medium,
Means for storing the image signal in a predetermined area of the second memory;
The image signal stored in the second memory is read in a predetermined order, and a reproduction unit for forming one screen is provided.

[0008]

The present invention will be described below with reference to illustrated embodiments. FIG. 1 is a block diagram of a recording system of a still video device to which an embodiment of the present invention is applied.

The system control circuit 10 is a microcomputer and controls the entire still video apparatus. The disk device has a magnetic head 11 and a spindle motor 12 for rotationally driving the magnetic disk D. The magnetic head 11 is tracking-controlled by the system control circuit 10 and is displaced along the radial direction of the magnetic disk D. The spindle motor 12 is drive-controlled by the system control circuit 10 and rotates the magnetic disk D at a rotation speed of 3600 rpm, for example. While the magnetic disk D is rotating, the magnetic head 1
1 is located on a predetermined track of the magnetic disk D, and an image signal and an ID code are recorded on this track. The recording amplifier 13 is controlled by the system control circuit 10 and outputs an image signal and the like to the magnetic head 11. In addition,
The magnetic disk D has 52 tracks, and signals such as image signals are recorded on 50 tracks counting from the outermost track to the inner track.

An operation unit 14 connected to the system control circuit 10 is provided for operating the present still video device. The ID code relating to the image recorded on the magnetic disk D, that is, the data such as the recording mode and the shooting date is also input through the operation unit 14.

A high-quality image signal obtained by a still video camera (not shown) or an external input terminal (not shown) is a Y signal (luminance signal) containing a synchronization signal S, P
r signal (a color difference signal (R-
Y)) and Pb signals (color difference signals (B-Y) having a standardized amplitude) are input to the still video device. In the figure, the code (H) attached to the input signals indicates that these signals are HDTV system (for example, high-definition television system).
It has been obtained by. In addition,
As is well known, the Pr signal and the Pb signal have a wider band than the conventional color difference signal, which improves the color resolution in the image signal.

The sync signal S included in the Y signal is separated from the Y signal by the sync signal separation circuit 21, and the memory control circuit 22 and the system control circuit 10 are separated.
Sent to. The memory control circuit 22 controls the AD converters 23, 24, 25, the Y memory 26, the Pr memory 27, and the Pb memory 28 based on the synchronization signal S. Further, the memory control circuit 22 controls the DA converters 31, 32, 33, the Y memory 26, the Pr memory 27, and the Pb memory 28 based on a synchronization signal from a synchronization signal generation circuit 34 described later.

The Y signal including the synchronizing signal S is the AD converter 2
3 is AD-converted, and the memory control circuit 22
The Y signal recorded between the two synchronization signals is stored in the Y memory 26 under the control of. Similarly, the Pr signal is AD
It is AD converted by the converter 24 and stored in the Pr memory 27. Further, the Pb signal is AD by the AD converter 25.
It is converted and stored in the Pb memory 28.

Y memory 26, Pr memory 27 and Pb
The Y signal, the Pr signal, and the Pb signal stored in the memory 28 are DA-converted by the DA converters 31, 32, and 33, respectively, based on the synchronization signal (reference clock signal) output from the synchronization signal generation circuit 34. . Y signal is D
The reference clock signal for A conversion has a frequency of, for example, 1/4 of that of the reference clock signal used for recording the Y signal in the Y memory 26. Meanwhile P
The reference clock signal for DA converting the r signal and the Pb signal is supplied to the Pr memory 27 and the Pb memory 28 as Pr.
It has, for example, a frequency of 1/2 compared to the reference clock signal used for recording the signal and the Pb signal. Here, the reference clock signal at the time of writing in the Pr memory 27 and the Pb memory 28 is, for example, 1 of that of the Y signal.
It has a frequency of / 2. Therefore, Y signal, Pr
Signals and Pb signals from the memories 26, 27 and 28,
The data is read out at a speed of 1/4 or 1/2 as compared with the time of writing in these memories, whereby the time axis is expanded. The DA converted Y signal, Pr signal and Pb signal are sequentially input to the recording processing circuit 35 via the switch 36 and subjected to processing such as FM modulation.

The ID code input via the operation unit 14 and the system control circuit 10 is subjected to processing such as DPSK modulation in the ID recording processing circuit 37.

The DPSK-modulated ID code, the FM-modulated Y signal, the Pr signal and the Pb signal are added to the adder 38.
Are superposed on each other, amplified by the recording amplifier 13 and sent to the magnetic head 11. And this ID code,
The Y signal, the Pr signal, and the Pb signal are recorded on a predetermined track of the magnetic disk D by the magnetic head 11.
As described above, the signal recorded on the magnetic disk D is expanded in the time axis as compared with the signal input to the still video device. Since the image signal is recorded on the magnetic disk D by expanding the time axis in this way, the input image is divided into the memories 26, 27 and 2 as described below.
8 is stored.

FIG. 2 schematically shows an example of a recording mode of image signals in the memories 26, 27 and 28 and the magnetic disk D. In this example, the image signals are recorded in the memories 26, 27, 28 and the magnetic disk D according to the high definition signal recording mode.
Shows the case of recording. Here, the high-definition signal recording mode refers to a mode in which the image signal is recorded in the frame recording mode, and the Y signal, the Pr signal, and the Pb signal are divided with respect to the screen and are recorded on different tracks. That is, one screen has the first field and the second
The Y signal is divided into four for one screen, the Pr signal and the Pb signal are divided into two for one screen, and the memories 26, 27, and 28 are respectively formed.
Stored in.

Regarding the Y signal, the screen is divided into four parts by a center line E extending in the vertical direction and a center line F extending in the horizontal direction. Y corresponding to the upper left screen of the first field
The signal (Y ₁ ) is stored in the first area of the memory, and the Y signal (Y ₂ ) corresponding to the upper right screen is stored in the second area of the memory. The Y signal (Y ₃ ) corresponding to the lower left screen of the first field is stored in the third area of the memory, and the Y signal (Y ₄ ) corresponding to the lower right screen is stored in the fourth area of the memory. To be done.

For the Pr signal, the screen is divided into two by a center line G extending in the horizontal direction. The Pr signal (Pr ₁ ) corresponding to the upper half screen of the first field is stored in the fifth area of the memory, and P signal corresponding to the lower half screen is stored.
The r signal (Pr ₂ ) is stored in the sixth area of the memory.
Also for the Pb signal, the screen has a center line G extending in the horizontal direction.
Pb signal (Pb ₁ ) corresponding to the upper half screen of the first field is stored in the seventh area of the memory and divided into two by the Pb signal (Pb ₁ ) corresponding to the lower half screen.
₂ ) is stored in the eighth area of the memory.

Similarly for the second field, the upper left corner,
Y signals (Y ₅ , corresponding to the upper right, lower left and lower right screens)
Y ₆ , Y ₇ , and Y ₈ ) are the ninth, tenth, and tenth memory cells, respectively.
It is stored in areas 11 and 12. The Pr signals (Pr ₃ , Pr ₄ ) corresponding to the upper half screen and the lower half screen are stored in the 13th and 14th areas of the memory, respectively. Pb signals (Pb ₃ , Pb ₃₎ corresponding to the upper and lower screens
b ₄ ) are stored in the 15th and 16th areas of the memory, respectively.

These signals are recorded on 16 continuous tracks on the magnetic disk D, respectively. That is, the Y signals (Y ₁ , Y ₂ , Y ₃ ,
Y ₄ ), Pr signal of the first field (Pr ₁ , P
r ₂ ), the Pb signal of the first field (Pb ₁ , Pb
b ₂ ), the Y signal of the second field (Y ₅ , Y ₆ , Y ₇ ,
Y ₈ ), Pr signal of the second field (Pr ₃ , P
r ₄ ), Pb signal of the second field (Pb ₃ , Pb ₄ )
In this order, one track is continuously recorded from the track on the outer peripheral side to the track on the inner peripheral side.

FIG. 3 shows the case of Y according to the high definition signal recording mode.
2 shows the relationship between the Y signal input to the still video device and the Y signal stored on the magnetic disk D when the signal is recorded on the magnetic disk D (see FIG. 2).

In the high-definition signal recording mode, since the image signal is recorded in the frame recording mode, the image signals of the first and second fields for one screen are input to the still video apparatus. An image signal forming one field is composed of a large number of horizontal scanning lines H, and an image signal corresponding to one horizontal scanning line H is 2 as shown in FIG.
It is sandwiched by two synchronization signals S.

As described above, in the first field, the Y signals (Y ₁ , Y ₂ , Y ₃ , Y ₄ ) corresponding to the upper left, upper right, lower left, and lower right screens are the _{first to the first} in the memory.
It is stored in each of the fourth areas. The image signals stored in the first to fourth areas of the memory are recorded on the first to fourth tracks of the magnetic disk D, respectively. Therefore, the Y signal (Y ₁ ) corresponding to the upper left screen is recorded on the first track, and the Y signal (Y ₂ ) corresponding to the upper right screen is recorded on the second track. The Y signal (Y ₃ ) corresponding to the lower left screen is recorded on the _third track, and the Y signal (Y ₄ ) corresponding to the lower right screen is recorded on the fourth track. The same applies to the second field. In the description of this embodiment, the Kth track does not mean the Kth track from the outermost periphery of the magnetic disk,
It means a relative track number based on an arbitrary track.

The band of the Y signal input to the present still video device is f _H , and when written in the Y memory 26,
The Y signal is in the band f _H. The Y signal is the Y memory 26
When read from, the time axis is expanded by 4 times. That is, the band of the Y signal recorded on the magnetic disk D is f _H
It becomes / 4. The band recorded on the magnetic disk D is determined by the structure of the disk device, and it is impossible to record a Y signal in a wider band than that. However, in the present embodiment, the Y signal is divided with respect to the screen and stored in the Y memory 26, the Y signal is expanded on the time axis, and the Y memory 2 is expanded.
6 and can be stored in the magnetic disk D in a predetermined band. Therefore, the band of the Y signal input to the present still video device is recorded on the magnetic disk D.
Even if it is wider than the signal band, the contents of the input Y signal can be stored in the magnetic disk D as it is, and the Y signal of high image quality is recorded on the magnetic disk D while maintaining the image quality. It

FIG. 4 shows P in the high-definition signal recording mode.
2 shows the relationship between the Pr signal input to the still video device and the Pr signal stored in the magnetic disk D when the r signal is recorded on the magnetic disk D (see FIG. 2).

Regarding the Pr signal, in the first field, the Pr signals (Pr ₁ , Pr ₂ ) corresponding to the upper half screen and the lower half screen are respectively stored in the fifth to sixth areas on the memory. The image signals stored in the fifth to sixth areas of the memory are the fifth to sixth areas of the magnetic disk D, respectively.
Recorded on the track.

The band of the Pr signal input to the present still video device is f _H / 2, and the Pr signal is stored in the Pr memory 27 in this band f _H / 2. When the Pr signal is read from the Pr memory 27, the Pr signal is doubled in the time axis, that is, the band of the Pr signal recorded on the magnetic disk D becomes f _H / 4. Therefore, even if the band of the Pr signal input to the present still video device is wider than the band of the Pr signal recorded on the magnetic disk D, the content of the input Pr signal can be stored on the magnetic disk D as it is. The Pr signal of high image quality is recorded on the magnetic disk D while maintaining the image quality.

Similar to the Pr signal, the Pb signal is time-extended by a factor of 2 when read from the Pb memory 28 as compared with the time of writing and recorded on the seventh and eighth tracks of the magnetic disk D.

FIG. 5 shows a flow chart of a program for recording the Y signal on the magnetic disk D in the high definition signal recording mode. Y signal is AD converted to Y memory 2
In order to store it in 6, the Y signal must be sampled at a frequency that is at least twice the band of the input Y signal. Therefore, in step 101, the memory clock is
It is set to a frequency f _SH that is at least twice the band f _H of the input Y signal. This memory clock is generated based on the reference clock signal output from the synchronization signal generation circuit 34. In step 102, the Y signal is AD converted based on this memory clock and written in the Y memory 26.

Next, at step 103, the memory clock is set to a frequency f _SL that is ¼ of the sampling frequency f _SH of the Y signal. In steps 104 to 108, the Y signal of the Y memory 26 is DA converted by the frequency f _SL and recorded on the magnetic disk D. That is, the Y signal is time-axis expanded by four times the input Y signal and is stored in the magnetic disk D.

At step 104, the counter N is "1".
Is set to. In step 105, the magnetic head 11
Is tracked to the K1th track. Then, in step 106, the Y signal stored in the Nth area of the Y memory 26 is read at the timing of the frequency f _SL and recorded on the magnetic disk D. In step 107, the counter N is incremented by 1, and in step 10
At 8, it is determined whether the counter N is "4" or less. If the counter N is equal to or less than “4”, the reading of Y signals from all the areas on the memory has not been completed. Therefore, after K1 is incremented by 1 in step 109,
Step 105 and subsequent steps are executed again. On the other hand, when the counter N exceeds "4", the reading of Y signals from all the areas on the memory has been completed, and this program is completed.

FIG. 6 shows a flow chart of a program for recording the Pr signal on the magnetic disk D in the high definition signal recording mode. This program is basically Y
This is similar to the operation of recording a signal on the magnetic disk D, and each step corresponds to the step in the flowchart of FIG.

Only steps different from those in FIG. 5 will be described. In step 202, the Pr signal is AD converted and written in the Pr memory 27. In step 204, the counter N is set to "5", and in step 205 the magnetic head 1
1 is tracked to the K2 (= K1 + 4) th track. In step 206, the Pr signal stored in the Nth area of the Pr memory 27 is read at the timing of the frequency f _SL and recorded on the magnetic disk D. In step 208, it is determined whether or not the counter N is "6" or less. If the counter N is "6" or less, the reading of the Pr signal of all the areas on the memory is not completed,
After K2 is incremented by 1 in step 209, step 205 and subsequent steps are executed again, and when the counter N exceeds "6", reading of the Pr signal of all the areas on the memory has been completed. The program ends.

FIG. 7 shows a flow chart of a program for recording the Pb signal on the magnetic disk D in the high definition signal recording mode. This program is basically Y
This is similar to the operation of recording a signal on the magnetic disk D, and each step corresponds to the step in the flowchart of FIG.

Only steps different from those in FIG. 5 will be described. In step 212, the Pb signal is AD converted and written in the Pb memory 28. In step 214, the counter N is set to "7", and in step 215 the magnetic head 1
1 is tracked to the K3 (= K2 + 2) th track. In step 216, the Pb signal stored in the Nth area of the Pb memory 28 is read at the timing of the frequency f _SL and recorded on the magnetic disk D. In step 218, it is determined whether or not the counter N is "8" or less. If the counter N is "8" or less, the reading of the Pb signals of all the areas on the memory has not been completed.
After K3 is incremented by 1 in step 219, step 215 and the subsequent steps are executed again, and when the counter N exceeds "8", the reading of the Pb signal of all the areas on the memory has been completed. The program ends.

The programs of FIGS. 5 to 7 show the recording operation of the image signal of the first field, and the recording operation is similarly performed for the second field. However, the initial value of the counter N in the second field, that is, the counters N in steps 104, 204, and 214 are 9, 13, and 15, respectively. Also K1, K2, K3
The initial value of is appropriately set depending on the recording mode, the recording condition of the track, and the like. However, in the case where the magnetic disk is unrecorded and field recording is performed, K1 = 1, K2 =
5, K3 = 7.

In addition to the image signal, the magnetic disk stores an ID code relating to the image signal, that is, data such as a recording mode and a photographing date. FIG. 8 shows a track area of the magnetic disk for recording this ID code. In FIG. 8, “H” indicates a horizontal scanning period. This ID
The code itself is the same as that used in a conventionally known still video device, and a user's area is provided. In this embodiment, the user's area is used to record the information necessary for automatically performing the screen division, the time axis extension, the image signal reading process, and the like.

That is, the user's area has 2 bits for indicating the recording mode, 2 bits for indicating the information of field / frame 2, 1 bit for indicating the tracking direction, 7 bits for indicating the head track number, and 7 bits are assigned to indicate a track number and 4 bits are assigned to indicate a configuration screen number, and an unused area is 31 bits. The contents of these pieces of information will be described in detail with reference to FIGS.

FIG. 9 shows information regarding the recording mode.
The "standard signal standard recording mode" means a method of recording an image signal on a magnetic disk without dividing the screen, that is, the same recording method (normal recording) as a conventional still video device, and the standard signal is, for example, NTSC. It is an image signal generated according to the method. FIG. 10 shows a recording mode of the image signal in the “standard signal standard recording mode”, in which the image signals (Y ₁ , Pr ₁ , P ₁₎ of the first field are recorded.
b ₁ ) is recorded on one track, and the image signals (Y ₂ , Pr ₂ , Pb ₂ ) of the second field are recorded on the other tracks. This "standard signal standard recording mode" is 2
This is indicated by setting the bit to "00".

In this mode, the number of tracks used for recording one screen is determined according to the recording mode signal stored in the field / frame area provided next to the initial bits of the ID code. That is, when the recording mode signal indicates the field recording mode, the image signal of only the first field is recorded, and when the recording mode signal indicates the frame recording mode, the image signals of the first and second fields are recorded. Is recorded. The recording mode signal stored in this field / frame area is ignored except in the "standard signal standard recording mode".

The "standard signal high-definition recording mode" is a method of recording a Y signal, a Pr signal, and a Pb signal on different tracks (color signal, although the screen is not divided in recording an image signal on a magnetic disk). Recording of another track). FIG. 11 shows a recording mode of the image signal in the “standard signal high-definition recording mode”, in which Y of the first field is recorded.
The signal (Y ₁ ) is recorded on the first track, and the Pr signal (Pr ₁ ) and Pb signal (Pb ₁ ) of the first field are recorded on the second track. The Y signal (Y ₂ ) of the second field is recorded on the third track, and the Pr signal (Pr ₂ ) and Pb signal (Pb ₂ ) of the second field are recorded on the fourth track. This "standard signal high-definition recording mode" is indicated by setting 2 bits to "01".

The "high-definition signal high-definition recording mode" is a mode in which the image signal is divided with respect to the screen and recorded in different tracks in the frame recording mode, as described above with reference to FIGS. Say. This "high-definition signal high-definition recording mode" is indicated by setting 2 bits to "10".

The "standard signal track separation frame recording mode" is a method of recording the image signal on the magnetic disk in the frame recording mode without dividing the screen.
This means a method of recording image signals of two fields on tracks that are not continuous. That is, in this mode, as in normal recording (FIG. 10), Y is recorded on one track.
Signal (Y ₁ ), Pr signal (Pr ₁ ), Pb signal (P
b ₁ ) is multi-recorded, but the image signals of the first field and the second field can be recorded on tracks which are not adjacent to each other. This "standard signal track separation frame recording mode" is indicated by setting 2 bits to "11".

FIG. 12 shows field / frame 2 information. This information is referred to when the recording mode (see FIG. 9) is other than the "standard signal standard recording mode" and indicates whether the image signal is recorded in the field recording mode or the frame recording mode. For example, in the case of "high-definition signal high-definition recording mode" shown in FIG. 2, "01" is set in each of the first to eighth tracks storing the image signal of the first field, and the image signal of the second field is set. "10" is set to each of the ninth to sixteenth tracks to be stored. When the image signal is recorded in the field recording mode, "00" is set in each track.

FIG. 13 shows information on the tracking direction. This information means whether a plurality of tracks storing image signals of one screen are lined up from the outer circumference to the inner circumference of the magnetic disk or from the inner circumference to the outer circumference of the magnetic disk. . For example, in the case of the example in FIG. 2, since the first to sixteenth tracks are arranged from the outer circumference to the inner circumference of the magnetic disk, “0” is set in each track.

FIG. 14 shows the information of the head track number.
This information indicates the absolute track number on which the first constituent screen is recorded among the other tracks constituting the same screen as the track on which this information is recorded. The upper 3 bits (GFE) indicates the track number 10 The place is represented, and the first place of the track number is represented by the lower 4 bits (DCBA). For example, in the example of FIG. 2, the first track (Y
When the absolute track number of the track on which the signal (Y ₁ ) is recorded is “16”, all other tracks constituting the same screen as this track are “0010110” (10
The leading track number information of 16) is stored in the decimal system.

FIG. 15 shows the information of the next track number. This information indicates an absolute track number in the next configuration screen. The upper 3 bits (GFE) represent the 10th position of the track number, and the lower 4 bits (DCBA) represent the 1st position of the track number. . For example, in the example of FIG. 2, the information of the next track number of the first track (the track on which the Y signal (Y ₁ ) is recorded) is “0110010” (1
In the case of 0-base 32), the second track (Y signal (Y ₂ )
The absolute track number of the track) is "3
2 ". The next track number is not always the number of the track adjacent to the track in which it is stored. That is, the following configuration screen may be recorded on a track that is distant.

FIG. 16 shows information on the composition screen number. This information indicates which screen the image signal stored in that track corresponds to, and the upper 2 bits (DC).
Represents the 10th position of the configuration screen number, and the lower 2 bits (BA) represents the 1st position of the configuration screen number. For example, in the example of FIG. 2, “0001” (1 in decimal) is recorded on the first track in which the Y signal (Y ₁ ) is stored, and Y
The second track in which the signal (Y ₂ ) is stored is “001
“0” (2 in decimal) is recorded.

Information such as the recording mode is DPSK-modulated by the ID recording processing circuit 37 (FIG. 1) and recorded on the magnetic disk D. As will be described later, these pieces of information are DPSK demodulated, read from the magnetic disk, decoded, and used for reproducing an image.

FIG. 17 shows a flow chart of a program for recording an image signal and the like on empty tracks which are scattered on the magnetic disk D.

In step 301, the magnetic head 11 is transferred to the first empty track. This operation is performed as follows. First, the image signal of the track where the magnetic head 11 is located at that time is reproduced, and it is determined whether or not the magnitude of the envelope detection signal of the image signal obtained by the envelope detection circuit 43 described later is less than or equal to a predetermined value. If the envelope detection signal is larger than the specified value,
It is considered that the image signal is already recorded on the track. Therefore, the magnetic head 11 is
Only one track is transferred to the inner peripheral side of, and the magnitude of the envelope detection signal is judged again. In this way, when a track whose envelope detection signal is equal to or less than the predetermined value is detected, it is determined that this track is an empty track.

In step 302, the track number of the first empty track obtained by the process of step 301 is set as the head track number (recording start track number) and stored in the memory. For example, if the track number is "16", the start track number is "1".
6 ”(see FIG. 14). This first track number is
In step 305, which will be described later, the image signal and the like are recorded on a predetermined track.

In step 303, it is judged whether or not the recording of the predetermined number of tracks is completed. This determination is made based on information such as the recording mode set by the photographer. For example, as in the example of FIG. 2, when the high-definition signal recording mode is selected and the frame recording mode is selected, the image signal of one screen is recorded in 16 tracks. It is determined whether or not the recording of the image signal on the track is completed. When step 303 is executed for the first time, the recording of the predetermined number of tracks has not been completed yet, so the process proceeds to step 304 in order to record the image signal or the like on an empty track.

At step 304, the configuration screen number corresponding to the image signal recorded at step 305 is set. For example, when step 304 is executed for the first time,
The first configuration screen number “01” is set. Next, at step 305, information such as the start track number and the configuration screen number is recorded on the track together with the image signal. When this step 305 is executed for the first time, the image signal of the first component screen number (Y signal (Y ₁ ) in the example of FIG. 2) is recorded in the storage area of the image signal of that track, and ID In the predetermined area of the code, the head track number, the configuration screen number, etc. are recorded.

Next, at step 306, the magnetic head 1
It is determined whether 1 is located on the 50th track (the track located on the innermost circumference of the magnetic disk D). If the magnetic head 11 is not located on the 50th track, the magnetic head 11 is moved to the inner circumference side of the magnetic disk D by one track in step 307. Step 308
Then, it is determined whether or not the magnetic head 11 has returned to the head track, that is, the first empty track (recording start track). At the initial stage of this recording operation, the magnetic head 11
Does not immediately return to the first track (recording start track), the process proceeds to step 309. Step 30
At 9, the size of the envelope detection signal is determined to determine whether the track to which the magnetic head 11 has been transferred is an empty track. If it is not an empty track, the process returns to step 306, and if it is an empty track, the process returns to step 303. Such steps 303 to 3
By executing 09, each image signal is recorded on a predetermined track together with various information in the order of the configuration screen numbers.

As a result of such recording operation, step 30
3, a predetermined number of tracks (16 in the case of the example in FIG. 2)
When it is determined that the recording of the (track) is completed, this program ends.

On the other hand, when it is determined in step 306 that the magnetic head 11 is located at the 50th track, the process proceeds to step 310, where the magnetic head 11 is transferred to the first track (the track located at the outermost circumference). It After that, step 308 and the subsequent steps are executed, and the image signal and the like are recorded in the empty track in the same manner as the above-mentioned operation.

When the number of empty tracks is not enough to record all image signals, the execution of step 307 causes the magnetic head 11 to return to the head track. In this case, the process proceeds from step 308 to step 311, an error message indicating that there are insufficient empty tracks is displayed on the display device or the like, and the program ends.

FIG. 18 shows an example in which a new image signal is recorded on vacant tracks that are scattered in the magnetic disk D. In this figure, Y signals (Y ₁ , Y ₂ , Y ₃ , Y ₄ ) and Pr signals (Pr ₁ , Pr)
₂ ) and the Pb signals (Pb ₁ and Pb ₂ ) are already recorded signals, and new signals Y (Y ₁ ', Y ₁ ) are added to the empty tracks existing between the tracks on which these signals are recorded.
_{2 ', Y 3', Y} 4 '), Pr signal _{(Pr 1', Pr 2 '} ) and Pb signal _{(Pb 1', Pb 2 '} ) is recorded.

FIG. 19 is a block diagram of a reproduction system of the still video device. The system control circuit 10, the magnetic head (reproducing head) 11, the spindle motor 12, and the operating section 14 are also included in the recording system shown in FIG. 1, that is, they both serve as a recording system and a reproducing system.

The magnetic head 11 is located on a predetermined track of the magnetic disk D and reproduces the ID code and the image signal recorded on this track. The reproduction amplifier 41 reads out the image signal and the ID code recorded on the magnetic disk D, and reproduces the reproduction processing circuit 42 and the envelope detection circuit 4
3, output to the ID reproduction processing circuit 44. Reproduction processing circuit 4
Reference numeral 2 FM demodulates and outputs the Y signal, the Pr signal and the Pb signal including the synchronization signal. Envelope detection circuit 43
Detects the envelope detection signals of these signals, and determines whether or not the reproduced track is an empty track. ID reproduction processing circuit 44
Outputs the ID code after DPSK demodulation.

The sync signal S included in the Y signal is separated from the Y signal by the sync signal separation circuit 45, and the memory control circuit 46 and the system control circuit 10 are separated.
Sent to. The memory control circuit 46 controls the AD converter 47, the Y memory 51, the Pr memory 52, and the Pb memory 53 based on the synchronization signal S. Further, the memory control circuit 46 includes a sync signal generation circuit 4 described later.
The DA converter 54, the Y memory 51, the Pr memory 52, and the Pb memory 53 are controlled on the basis of the synchronization signal from 8.

The Y signal including the sync signal is converted to the AD converter 47.
The Y signal recorded between the two sync signals is stored in the Y memory 51 under the control of the memory control circuit 46. The Y signal stored in the Y memory 51 is DA-converted by the DA converter 54 based on the synchronization signal (reference clock signal) output from the synchronization signal generation circuit 48. Similarly, the Pr signal and the Pb signal are AD-converted by the AD converter 47 and stored in the Pr memory 52 and the Pb memory 53, respectively. Pr
The signal and the Pb signal are P based on the reference clock signal.
The data is output from the r memory 52 and the Pb memory 53, and is input to the DA converters 55 and 56 and DA-converted by the operation of the memory control circuit 46.

The reference clock signal used when reading the Y signal from the Y memory 51 is, for example, 4 as compared with the reference clock signal used when the Y signal is recorded in the memory.
It has twice the frequency. Therefore, the Y signal is read out from the Y memory 51 at a high speed, and the time axis compression is thereby performed. On the other hand, the reference clock signal used when reading the Pr signal and the Pb signal from the Pr memory 52 and the Pb memory 53 is, for example, twice the reference clock signal used when recording the Pr signal and the Pb signal in the memory. Have a frequency. Therefore, the Pr signal and the Pb signal are read out at high speed from the Pr memory 52 and the Pb memory 53, and thus, the time axis compression is performed.

Blanking sync mix circuits 61 and 6
Reference numerals 2 and 63 are provided to set predetermined front portions of the Y signal, the Pr signal, and the Pb signal to signals of 0 level, and to superimpose the synchronization signals. With this blanking sync mix circuit 61, 62, 63,
A clean sync signal conforming to each system such as HDTV is added before these signals. The Y signal, the Pr signal, and the Pb signal output from the blanking sync mix circuits 61, 62, and 63 are television signals according to, for example, an HDTV system (for example, a high-definition television system), and are directly input to a display device (not shown). To be done.

The ID code stored in the magnetic disk D is subjected to processing such as DPSK demodulation in the ID reproduction processing circuit 44 and decoded by the system control circuit 10. As a result, the system control circuit 1
0 recognizes information such as the recording mode and reproduces a predetermined image.

FIG. 20 shows a flow chart of a program for reproducing the image signal recorded on the magnetic disk D.

In step 401, the magnetic head 1 is then
The track on which 1 is located is reproduced and the ID code recorded on this track is decoded. That is, various information such as the recording mode, the field / frame 2, the tracking direction, the first track number, the next track number, and the configuration screen number are decoded. In step 402, the leading track number is stored in memory for subsequent processing.

At step 404, the ID code is read and the information such as the recording mode is decoded. Step 405
Then, it is determined whether or not the head track number decoded in step 404 matches the head track number stored in the memory in step 402. The track containing the image signal you are about to play is
All have the same start track number. Therefore, when the leading track number decoded in step 404 matches the leading track number stored in the memory,
That is, when the magnetic head 11 is located on the track to be reproduced, steps 406 and after are executed.

On the other hand, when it is determined in step 405 that the start track number decoded in step 404 does not match the start track number stored in the memory, the magnetic head 11 is positioned at the track to be reproduced. Since it has not done so, steps 406 and 407 are skipped, and the process proceeds to step 408.

In step 406, the image signal is stored in the memory 5
It is stored in a predetermined area of 1 to 53. This predetermined area corresponds to the constituent screen number of the image signal, and for example, the image signal of the first constituent screen number is stored in the first area of the memory. In step 407, it is determined whether or not the reproduction of the predetermined number of tracks has been completed. This determination is made based on the information of the recording mode (see FIG. 9) and field / frame 2 (FIG. 12) stored in the ID code area.
That is, for example, when the high-definition signal recording mode and the frame recording mode are selected, as in the example of FIG. 2, the image signal of one screen is recorded on 16 tracks. It is determined whether the reproduction of the 16 tracks is completed. When step 407 is executed for the first time, the reproduction of the predetermined number of tracks has not been completed yet, so the routine proceeds to step 408, where it is judged whether or not the magnetic head 11 is located at the 50th track. If the magnetic head 11 is not located on the 50th track, the magnetic head 11 is moved to the inner circumference side of the magnetic disk D by one track in step 409, and the process returns to step 404.

When the image signals of all tracks to be reproduced are stored in the memories 51 to 53 by repeating the processing of steps 404 to 409, the process proceeds from step 407 to step 411 and is stored in the memories 51 to 53. The image signals are read out in the order of a predetermined area, that is, in the order of the constituent screen numbers, and are output to a monitor such as a display device.

On the other hand, during the processing of steps 404 to 409, in step 408, the magnetic head 11 moves to the 50th position.
If determined to be on track, step 4
At 10, the magnetic head 11 is transferred to the first track. Then, step 404 and subsequent steps are executed again, and after all the image signals to be reproduced are stored in the memory in the same manner as the above-described operation, in step 411, the image signals stored in the memories 51 to 53 are predetermined. The data is read out in the order of areas and output to a monitor such as a display device.

As described above, according to the above embodiment, the still video device can record and reproduce an image having a higher image quality than the conventional one.

Further, in the above-mentioned embodiment, since the head track number and the configuration screen number are stored in the area for recording the ID code of each track of the magnetic disk D, there are consecutive empty tracks. Even if it does not exist, the image signal forming one screen can be recorded in each empty track. Therefore, the utilization efficiency of the magnetic disk is improved.

Further, in the above-described embodiment, when recording the image signal on the magnetic disk D, it is not necessary to record the image signal in the order of the constituent screen numbers. Therefore, the magnetic head 11 is moved from the outer peripheral side to the inner peripheral side of the magnetic disk D. Alternatively, it is possible to record the entire image signal only by tracking in one direction from the inner circumference side to the outer circumference side. Further, the image signal is stored in a predetermined area of the memories 51 to 53 according to the configuration screen number,
Since it is configured to be read from the memories 51 to 53 in the order of the configuration screen numbers, it is not necessary to reproduce the image signals from the magnetic disk D in the order of the configuration screen numbers, and the tracking operation of the magnetic head 11 can be performed in the same manner as during recording. It will be simple.

Although the above embodiment is configured to record the image signal and the like on the magnetic disk D, the recording medium is not limited to the magnetic disk.

The present invention is not limited to the structure in which one screen is divided into a plurality of screens for recording, but can be applied to a structure in which an image signal of one screen is recorded in a number of tracks.

[0080]

As described above, according to the present invention, an image signal forming one screen can be recorded on a plurality of tracks even if a plurality of empty tracks are not continuously present. There is an effect that one screen can be formed by reproducing such a plurality of tracks. Further, according to the present invention, it is possible to obtain the effect of simplifying the tracking operation of the head in the operation of recording and reproducing the image signal on the recording medium.

[Brief description of drawings]

FIG. 1 is a block diagram of a recording system of a still video device to which an embodiment of the present invention is applied.

FIG. 2 is a diagram schematically showing an example of a recording mode of image signals stored in a memory and a magnetic disk.

FIG. 3 is a diagram showing an example of a relationship between a Y signal input to a still video device and an image signal stored on a magnetic disk.

FIG. 4 is a diagram showing an example of a relationship between a Pr signal input to a still video device and an image signal stored on a magnetic disk.

FIG. 5 is a flow chart showing a program for storing a Y signal in a memory, expanding it on the time axis, and recording it on a magnetic disk.

FIG. 6 is a flowchart showing a program for storing a Pr signal in a memory, expanding the time axis, and recording it on a magnetic disk.

FIG. 7 is a flowchart showing a program for storing a Pb signal in a memory, expanding the time axis, and recording it on a magnetic disk.

FIG. 8 is a diagram showing a track area of a magnetic disk for recording an ID code.

FIG. 9 is a diagram showing a signal of information regarding a recording mode.

FIG. 10 is a diagram schematically showing a recording mode of an image signal stored in a memory in a standard signal standard recording mode.

FIG. 11 is a diagram schematically showing a recording mode of an image signal stored in a memory in a standard signal high definition recording mode.

FIG. 12 is a diagram showing signals of information related to field / frame 2.

FIG. 13 is a diagram illustrating a signal of information regarding a tracking direction.

FIG. 14 is a diagram showing a signal of information relating to a leading track number.

FIG. 15 is a diagram showing a signal of information regarding a next track number.

FIG. 16 is a diagram showing a signal of information regarding a configuration screen number.

FIG. 17 is a flowchart of a program for recording an image signal of an empty track.

FIG. 18 is a diagram schematically showing an example in which an image signal is recorded on vacant tracks that are scattered everywhere.

FIG. 19 is a block diagram of a reproduction system of a still video device to which an embodiment of the present invention is applied.

FIG. 20 is a flowchart of a program for reproducing an image signal recorded on a magnetic disk.

[Explanation of symbols]

 D magnetic disk (recording medium)

Claims (2)

[Claims] 1. An ID of each track of a recording medium in which an image signal corresponding to one screen is recorded over a plurality of tracks.
A screen identification information storage unit that stores information for identifying a screen in a code recording area, and a configuration screen that stores a configuration screen number indicating a correspondence between an image signal and a screen in the ID code recording area. A number storage means, a means for storing an image signal in a predetermined area of the memory based on the screen identification information and the configuration screen number stored in each track of the recording medium, and a predetermined number for storing the image signal in the memory. A still video device, comprising: a reading means for reading in order; and a reproducing means for forming one screen. 2. A means for dividing an image signal corresponding to one screen into a plurality of portions and storing the divided image signal in a first memory;
Means for time-axis expansion and recording on a plurality of tracks of a recording medium; and screen identification information storage means for storing information for identifying a screen in an area for recording the ID code of each track on which the image signal is recorded. In the area for recording the ID code, a configuration screen number storage means for storing a configuration screen number indicating the correspondence between the image signal and the screen, and screen identification information and configuration screen numbers stored in each track of the recording medium. Based on the above, there are provided means for storing the image signal in a predetermined area of the second memory, and reproducing means for reading out the image signal stored in the second memory in a predetermined order to form one screen. Characteristic still video device.