JPH0454781A - Image signal recording and playback system - Google Patents

Abstract

PURPOSE:To easily discriminate a sampling picture signal at reproduction by adding any of signals representing a recording form, a field number of the picture signal and a picture number of the picture signal to the sampling picture signal. CONSTITUTION:In the case of recording a picture signal onto a video floppy, information relating to a picture to be recorded, that is, information such as field/frame, track number, year/month/day is encoded and an ID signal formed by applying DPSK modulation to the code is added to a relevant picture signal and the resulting signal is recorded. A user area to add a code set optionally by the user is provided for the ID signal. The reproducing system can discriminate a picture signal as to whether it is a picture signal recorded by a conventional system or a picture signal recorded by a CHSV system by adding an ID signal whose field/frame code is assigned with a code pattern '1,1' to the picture signal recorded by the CHSV system.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an image signal recording and reproducing system that records an image signal on a recording medium and reproduces the image signal recorded on the recording medium.

[Conventional technology]

Conventionally, CCD (Charge Coupled
An electronic still video camera (hereinafter referred to as a floppy camera) has already been commercialized as a system for recording an image signal obtained from an image sensor such as a device as a still image signal on a disc-shaped magnetic recording medium (video floppy).

Images recorded with this floppy camera do not require a developing process like silver halide photography, so they can be viewed immediately by displaying them on a television monitor or making hard copies using a video printer.

By the way, the image quality of images taken with such a floppy camera is compliant with the current television system such as NTSC or PAL, so the vertical resolution is about 500 lines, and the horizontal resolution is about 500 lines. Since it is limited by the number of pixels, even if it is made into a hard copy, the image quality (especially resolution) is insufficient compared to silver halide photography.

Therefore, a still image for one screen is composed of four field images, and the field image signal corresponding to each field image is recorded in a conventional recording format, such as the FM carrier frequency, recording track pattern, etc. when FM modulating the luminance signal. is recorded using the four tracks on the video floppy without changing it, and the four field image signals reproduced from the four tracks on the video floppy are reconstructed using the image memory. , a system (hereinafter referred to as CH8V (Compatible
le High definition 5till
(referred to as the Video) system) is being considered.

As shown in Figure 6, the CH5V system described above uses an image sensor with a total number of pixels of 1300 x 1000 pixels, and among the pixels formed on the imaging surface, the accumulation occurs in the pixels indicated by circles in the figure. By reading out only the information shown in Fig. 6, the lines Ai, Bi, Ci, Di
The pixel information signals read from 12...) are transferred to four tracks (A to
D), and during playback, the four tracks on the video floppy shown in FIG. The pixel information shown by the X mark (i.e., the pixel information recorded on the video floppy) is used to calculate the pixel information shown by the X mark (i.e., the pixel information recorded on the video floppy and played back). By interpolating the missing pixel information), a high-definition image signal with a total number of pixels of 1300 x 1000 pixels is reconstructed on the memory.

[Problem that the invention is trying to solve] However,
When a high-definition image signal is recorded on a video floppy using the C) isV system described above, the format of each individual track is the same as when recording a television signal compliant with the conventional NTSC or PAL format. The image signal recorded on the track formed above corresponds to a conventional television signal recorded by a conventional system, or corresponds to a high-definition image signal recorded by a CH3V system. Since it is not possible to determine whether the
It was not possible to record both image signals together on a single video floppy, making it inconvenient to use.

The present invention has been made to solve the above-mentioned problems, and is capable of recording and reproducing image signals that can record a plurality of types of image signals having different resolutions on a recording medium so that they can be distinguished from each other when they are reproduced. The purpose is to provide a system.

[Means to solve the problem]

The image signal recording and reproducing system of the present invention records a sampled image signal formed by sampling an image signal on a recording medium, and restores the original image signal using the sampled image signal reproduced from the recording medium. In the system, a sampling image signal forming means for forming a sampling image signal by sampling an image signal, and a signal indicating a recording format of the image signal, a signal indicating a recording format of the image signal, and a signal indicating a recording format of the image signal are added to the sampling image signal formed by the sampling image signal forming means. The apparatus is equipped with a recording means for adding at least one of a signal indicating a field number and a signal indicating an image number of an image signal and recording it on a recording medium.

[Effect]

According to the above configuration, even when an image signal is recorded on a recording medium in the form of a sampled image signal, it can be easily determined that the image signal is a sampled image signal at the time of reproduction.

〔Example〕 Hereinafter, the present invention will be explained using examples of the present invention.

Traditionally, in electronic still video formats, when recording image signals on a video floppy, information about the recorded image, such as field/frame, track number, date, etc., is encoded, and the code is then encoded. DPSK (Differential Phase
An ID (index) signal formed by 5-hift keying) modulation is added to the corresponding image signal and recorded.

Further, the above ID signal is provided with a user's area for adding a code that can be arbitrarily set by the user, in addition to data codes such as field/frame, track number, date, etc.

FIG. 2 shows the bit allocation of the above-mentioned ID signal.

In Figure 2, the starting position of the vertical synchronization signal of the image signal (
A or A' in the diagram) to 28H or 28.5
During the period up to H (H is 1 horizontal synchronization period), data indicating "0" or "1" continues, and after this period, 1-bit data is shown in a 4H period.

That is, as shown in Figure 2, the initial bit is 1 bit (4H) and the field/frame code is 2 bits (4H).
8H), track number is 7 bits (28H), date code is 19 bits (76H), user's engineering rear is 27
The number of bits (108H) is provided. Note that point B in FIG. 2 is the position of a PG pin for rotational position detection provided on the video floppy.

3(a) shows the structure of the field/frame code, FIG. 3(b) shows the structure of the track number coat, and FIG. 3(c) shows the structure of the date code.

Therefore, in the first embodiment of the present invention, an ID signal in which a code pattern "1.1" not shown in FIG. 3(a) is assigned to the field/frame code is used for the image signal recorded in the CH8V system. By adding the CH8
(2) It shall be determined whether the image signal is recorded by the system.

In addition, in the second embodiment of the present invention, the image signals recorded in the CHS and V systems are placed in the user's area, and the recorded image signals are compliant with the NTSC system or PAL system recorded in the conventional system. By adding an ID signal to the image signal with a code indicating whether it is a recorded standard television signal or a high-definition image signal recorded by the CH8V system, the playback side can This is to determine whether the image signal is recorded by a conventional system or by a CH3V system.

As described above, in both the first and second embodiments, by setting a discrimination code in the ID signal added to the image signal during recording, the image signal recorded on the video floppy can be used on the playback side. It is possible to determine whether the image signal is an image signal recorded by a conventional system or an image signal recorded by a CHSV system.

By the way, the CH3V system samples the image signal, converts the sampled signal into analog, records it on a video floppy, resamples the signal played from the video floppy during playback, and stores the resampled signal in the memory. Since the original image signal is restored by reconstruction, the sampling position at the time of recording and the resampling position at the time of playback must be accurately matched, so the reference pilot signal is added to the image signal at the time of recording. It is configured such that the reference pilot signal is added and recorded, and during playback, the reproduced reference pilot signal is used to correct the time axis.

Therefore, as a third embodiment of the present invention, by detecting the presence or absence of the reference pulse signal on the playback side, it is possible to determine whether the image signal recorded on the video floppy is an image signal recorded in the conventional system (reference pilot signal It is possible to determine whether the image signal is an image signal recorded in the CH5V system (if the reference pilot signal is not reproduced) or whether the reference pilot signal is reproduced (if the reference pilot signal is reproduced).

In addition, as mentioned above, the high-definition image signal is divided into four field image signals by the CH8V system, and one field worth of image signal is dividedly recorded on each of the four tracks on the video floppy, so the current If it cannot be determined which field image signal the image signal being reproduced is, it will not be possible to restore the original high-definition image on the memory during reproduction. So, 4 on the video floppy
If four field image signals are recorded in a predetermined order on a book track, the playback side can reproduce the reproduced image signal without having to determine which field image signal is currently being reproduced. The original high-definition image can be restored by sequentially storing the images in a predetermined area on the memory according to the order in which the images are stored.

In addition, the types of field image signals (
By adding an ID signal with a 2-bit field number determination code representing 4 types) to the image signal,
On the playback side, it is possible to determine which field image signal the currently output image signal is, so that the recording order of the four field image signals can be arbitrarily selected and recorded at the time of recording.

Additionally, 50 tracks can be formed on a video floppy, and when recording using a conventional system, up to 50 still images can be recorded for field images, and up to 25 still images can be recorded for frame images. It is. When recording with the CH3V system, four tracks are used to record one screen's worth of high-definition image signals, so up to 12 screens of high-definition still images can be recorded on the video floppy. be.

Therefore, the types of high-definition images (up to 1
By adding an ID signal to the image signal with a 4-bit image number determination code representing 2 types), the playback side can determine the height of the currently played image signal recorded on the video floppy. It becomes possible to determine whether it is compatible with fine images.

Regarding the image signals recorded on the video floppy as described above, (A) method for determining the recording format, (B) method for determining the field image type (field number), and (C) recording order of high-definition images (image The method for determining the number) is as follows:
Two types of combinations are possible.

(1) Recording format determination: Field/frame code “1”
Field number determination: No determination (no code added for field number determination) Image number determination: No determination (no code added for image number determination) (2) Recording format determination: Field/frame code “1”
Field number determination: No determination (field number determination code not added) Image number determination: Determination based on the image number determination code added to the user's area (3) Recording format determination: Field/frame code “1”
Field number determination: Judgment based on the field number determination code added to the user's area Image number determination: Non-judgment (no image number determination code added) (4) Recording format determination: Field/frame code “1”
1” Field number determination: Determined by the field number determination code added to the user's area Image number determination: Determined by the image number determination code added to the user's area (5) Recording format determination: Based on the presence or absence of a pilot signal Judgment Field number judgment: Non-judgment (no code added for field number judgment) Image number judgment: Non-judgment (no code added for image number judgment) (6) Recording format judgment: Judgment based on presence or absence of pilot signal Field number judgment: Non-determination (no field number determination code added) Image number determination: Determined by the image number determination coat added to the user's area (7) Recording format determination: Determined by the presence or absence of a pilot signal Field number determination: In the user's area Determined by the added field number determination code Image number determination: Non-determined (no image number determination code added) (8) Recording format determination: Determined by the presence or absence of a pilot signal Field number determination: Field added to the user's area Image number determination: Determined by the image number determination code added to the user's area (9) Recording format determination: Determined by the recording format determination code added to the user's area Field number determination: Non-determined ( Image number judgment: No judgment (No code for image number judgment added) (lO) Recording format judgment - Judgment based on the recording format judgment code added to the user's area Field number judgment: No judgment Judgment (field number judgment code not added) Image number judgment: Judgment based on the image number judgment code added to the user's area (11) Recording format judgment: Judgment field based on the recording format judgment code added to the user's area Number judgment: Judgment based on the field number judgment code added to the user's area Image number judgment: Non-judgment (no image number judgment code added) (12) Recording format judgment: Recording format judgment code added to the user's area Judgment Field number judgment: Judgment based on the field number judgment code added to the user's area. Image number judgment: Judgment based on the image number judgment code added to the user's area. 4
As shown in the figure.

FIG. 1 shows a schematic configuration of a reproducing apparatus in an image signal recording and reproducing system for reproducing a video floppy on which an image signal to which a discrimination code or reference pilot signal is added is recorded.

In FIG. 1, a magnetic head 2 is rotated by a video floppy l which is rotated at a predetermined number of revolutions by a motor (not shown).
The reproduced signal reproduced by
p) The signal is supplied to the circuit 17 and the reference pilot signal detection circuit 18.

The reproduction signal processing circuit 4 subjects the reproduction signal supplied from the reproduction amplifier 3 to various reproduction signal processing such as FM demodulation and de-emphasis processing, and then supplies the signal to the switch 9 . Further, from the reproduced signal processing circuit 4, a synchronization signal 5YNC detected from the reproduced signal is supplied to the DPSK demodulation circuit 6.

In addition, the BPF 5 extracts an ID signal from the reproduction signal supplied from the reproduction amplifier 5, and the DPSK demodulation circuit 6 extracts the ID signal from the reproduction signal supplied from the reproduction amplifier 5.
Synchronization signal 5YN supplied from the reproduction signal processing circuit 4
In synchronization with C, the DPSK-modulated ID signal is demodulated and supplied to the ID decoder 7.

The ID encoder 7 converts the ID signal supplied from the DPSK demodulation circuit 6 into code data and supplies it to the system controller 8.

On the other hand, the reference pilot signal detection circuit 18 determines whether or not the reference pilot signal is added to the reproduction signal supplied from the reproduction amplifier 3, and supplies a determination signal to the system controller 8 according to the determination result. There is.

The system controller 8 uses the ID decoder 7 as described above.
In the conventional system, the image signal recorded on the track on the video floppy 1 that is currently being traced by the magnetic head 2 is determined according to the code data supplied from the reference pilot signal detection circuit 18 and the discrimination signal supplied from the reference pilot signal detection circuit 18. It is determined whether the image signal is recorded by the CH5V system based on the presence or absence of a reference pilot signal or the content of the code data, and the image signal currently being played back is determined to be the one recorded by the CH5V system. If it is determined, connect switches 9 and 10 to the a terminal side in the diagram, and if it is determined that the data was recorded using a conventional system, connect switches 9 and 10 to the b terminal side in the diagram. do.

Additionally, the system controller 8 determines whether the image signal currently being reproduced is converted to the CI (SV system) depending on the presence or absence of the reference pilot signal or the content of the code data.

If the code data indicates a field number or image number, a memory control circuit 19 (described later) records the image number (not shown) according to the field number or image number indicated by the code data. Controls the display section to display.

As mentioned above, the system controller 8 causes the switch 9,
10 is connected to the b terminal side in the figure, the image signal output from the reproduced signal processing circuit 4 is converted into a television signal compliant with the NTSC system or PAL system by the image signal conversion circuit 11 via the switch 9. After being converted, it is output via switch 10.

Further, when the switches 9 and 10 are connected to the a terminal side in the figure, the image signal output from the reproduced signal processing circuit 4 is supplied to the A/D converter 12 via the switch 9.

On the other hand, in the PLL circuit 17, when the reference pilot signal is added to the reproduction signal supplied from the reproduction amplifier 3 (
In other words, when the image signal being played back is one recorded by the CH3V system, the reference pilot signal is separated, a sampling clock signal phase-synchronized with the separated reference pilot signal is generated, and A/D conversion is performed. Vessel 1
2. Supplied to the memory control circuit 19.

Then, the A/D converter 12 digitizes the image signal supplied via the switch 9 in synchronization with the sampling clock signal supplied from the PLL circuit 17.
The data is supplied to the memory 13.

Data writing and reading operations of the memory 13 are controlled by a memory control circuit 19, and the memory control circuit 19 determines the write address of the memory 13 according to the field number of the image detected by the system controller 8. is specified, and the image data supplied from the A/D converter 12 is stored.

As mentioned above, the image signal reproduced from one track on the video floppy l is digitized in synchronization with the sampling clock phase-synchronized with the reproduced image signal, and the image signal is digitized in the memory 13 corresponding to the field number of the reproduced image signal. After the magnetic head 2 is stored at the address, the system controller 8 gives an instruction to a head moving mechanism (not shown) to move the magnetic head 2 to another track on the video floppy l. still,
In the image signal recorded with the CH5V system, I
When code data indicating a field number is not added to the user's area of the D signal and an image signal recorded in a predetermined track pattern is to be reproduced, the magnetic head 2 is moved to a track position corresponding to the predetermined track pattern. The system controller 8 controls the head moving mechanism so as to move the head, and code data indicating the field number is added to the user's area of the ID signal. 1
The system controller 8 controls the head moving mechanism so as to move the magnetic head 2 by the number of tracks.

After the magnetic head 2 is moved by the head moving mechanism as described above, the same playback operation as described above is performed, and by repeating this operation, the four tracks on the video floppy 1 are stored in the memory 13. After the image data corresponding to the four field image signals to be reproduced is stored, the system controller 8 instructs the memory control circuit 19 to start the interpolation processing operation.

The memory control circuit 19 receives an instruction to start the interpolation processing operation from the system controller 8 as described above, reads out the image data stored in the memory 13 to the interpolation circuit 14, and the interpolation circuit J4 reads out the image data stored in the memory 13. By using the image data stored on the video floppy l to interpolate the image data not recorded on the video floppy l and storing it on the memory 13 again, 1300x, 10
After forming image data corresponding to a high-definition image having a resolution of about 0.00 pixels and completing the interpolation processing operation, the image data stored in the memory 13 is read out and supplied to the image signal conversion circuit 15. .

The image signal conversion circuit 15 converts the image data read out from the memory 13 into a signal format compatible with a high-definition image signal such as a high-definition system, and then a D/A converter 16 that operates in synchronization with an accurate lock signal. After being converted into analog data, it is outputted via the switch 10.

The above playback operation is based on the image signal played back from the video floppy, depending on the presence or absence of the reference pilot signal or the content of the code data, whether it was recorded with the conventional system or the CH8V system. We have described the case where the system controller 8 of FIG. 1 is forced to operate the conventional SV When instructed to perform a playback operation based on the system, that is, field playback or frame playback, switches 9 and 10 are connected to the b terminal side in the figure.
The image signal reproduced by the magnetic head 2 and processed by the reproduction signal processing circuit 4 is digitized by the A/D converter 12, and is converted into NTSC or PAL format by the image signal conversion circuit 11 without being stored in the memory 13. After being converted into a television signal compliant with the above, the signal is output via the switch 10.

In addition, regarding the image signals recorded on the video floppy l as described above, (A) a method for determining the recording format, (B) a method for determining the type of field image (field number), (
C) Method 12 of determining the recording order (image number) of high-definition images
Operation flowcharts of the system controller 8 of FIG. 1 for each type of combination are shown in FIGS. 5(a) to 5(I).

〔Effect of the invention〕

As described above, the present invention provides an image signal recording and reproducing system that can record multiple types of image signals with different resolutions on a recording medium so that they can be distinguished from each other when reproduced. I can do that.

[Brief explanation of drawings]

FIG. 1 shows, as an embodiment of the present invention, a schematic configuration of a reproducing device in an image signal recording and reproducing system for reproducing a video floppy on which an image signal to which a discrimination code or a reference pilot signal is added is recorded. It is a diagram. FIG. 2 is a diagram showing the bit allocation of the ID signal. FIG. 3 is a diagram showing the configuration of each code in the ID signal, (a) is a configuration diagram of the field/frame code, (b)
) is a configuration diagram of a track number code, and (C) is a configuration diagram of a date code. Figure 4 shows the recording format determination method and field image types (
FIG. 4 is a diagram illustrating examples of combinations of methods for determining the recording order (image numbers) of high-definition images; Figure 5 shows the recording format determination method and field image types (
2 is a diagram showing an operation flowchart of the system controller 8 of FIG. 1 in each combination of a method for determining a field number) and a method for determining a recording order (image number) of high-definition images. FIG. 6 is a diagram showing the arrangement of pixels sampled in the image sensor and recorded on the recording medium. FIG. 7 is a diagram showing a track pattern formed on a video floppy. 1...Video floppy 2...Magnetic head 4...Reproduction signal processing circuit 5...Band pass filter 6...DPSK demodulation circuit 7...ID decoder 8...System controller 9.10. ...Switch 12...A/D converter 13...Memory 14...Interpolation circuit 16...D/A converter 17...PLL circuit 18...Reference pilot signal detection circuit 19...・Memory control circuit (α) ・Field/frame code Yu'J) IQQO Hayabusa May 29th n 5 Figure ((1) Judgment dissim C1) @ b I 乍 Flow outside v15 Diagram (e) Judgment one side (5) Heavy Kai-fu o-4 and Tokori proof-
%; Formula (f) @ 4S flow multi-sade diagram

Claims (1)

[Claims] In a system that records a sampled image signal formed by sampling an image signal on a recording medium and restores the original image signal using the sampled image signal reproduced from the recording medium, a sampling image signal forming means for forming a sampled image signal by sampling a signal; and a signal indicating a recording format of the image signal and a field number of the image signal in the sampling image signal formed by the sampling image signal forming means. What is claimed is: 1. An image signal recording and reproducing system comprising: a recording means for adding at least one of a signal and a signal indicating an image number of an image signal and recording it on a recording medium.