JPH07274104A - Recording/reproducing device - Google Patents

Abstract

PURPOSE:To effectively use a memory in accordance with the capacity of the memory by selectively recording a frame number and an image signal in the memory in accordance with the capacity of the memory. CONSTITUTION:When an operation part 11 indicates an index, a system controller 16 reads data stored in the memory 23 through a switch 24 by a memory read processing circuit 18. Then, a memory capacity detection circuit 19 detects the capacity of the memory 23 based on data which is read, and controls a memory write processing circuit 17 and a switch 27 in accordance with the capacity. When the frame number and the picture signal are recorded in the memory 23, the circuit 17 records mode is information whether a recorded one is the frame number and that whether the frame number is recorded with the image signal in the memory 23.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording / reproducing apparatus for recording / reproducing an image signal, and more particularly to an apparatus for recording / reproducing a digital image signal.

[0002]

2. Description of the Related Art Among devices of this type, a digital VTR for digitizing a moving image signal such as a video signal and recording it on a magnetic tape has been conventionally known. In recent years, there has been considered a magnetic tape cassette provided with a memory other than a magnetic tape such as a semiconductor memory (hereinafter referred to as a memory). The contents stored in this semiconductor memory include
Information such as the thickness and type of the tape and the title of the recorded image is considered, but the capacity of the memory is still more expandable as the technology develops in the future.

[0003]

However, when the tape cassette is provided with the memory as described above, the capacity thereof may be different depending on each cassette because the expandability is taken into consideration as described above.

Therefore, for example, when a function of storing an image of a scene being recorded or reproduced as index information in the memory in the cassette is provided, the image information is displayed even if the memory capacity is small. There are cases in which all the information cannot be stored in an attempt to store it, or image information is not stored even though there is sufficient capacity, and the memory capacity cannot be fully exerted.

In view of the above-mentioned problems, the present invention is capable of selectively recording an image signal according to the capacity of the memory,
It is an object of the present invention to provide a recording / reproducing device capable of fully utilizing the capacity of a memory.

[0006]

SUMMARY OF THE INVENTION In order to solve the problems conventionally held and to achieve the above-mentioned object, the present invention is capable of storing image signals, respectively, and has a first memory and a second memory of different types. Recording / reproducing means capable of recording / reproducing the image signal and an additional signal corresponding to the image signal to / from a memory means integrally provided with a memory; and a detecting means for detecting a capacity of the second memory, And a control means for controlling the recording of the image signal or the additional signal in the second memory according to the output of the detection means.

[0007]

Since the present invention is configured as described above, it becomes possible to effectively use the memory according to the capacity of the memory.

[0008]

Embodiments of the present invention will now be described in detail with reference to the drawings.

FIG. 1 is a block diagram showing the configuration of a digital VTR as a first embodiment of the present invention.

First, a case where an image signal is normally recorded / reproduced on a magnetic tape will be described with reference to FIG.

In FIG. 1, an analog image signal such as a video signal is input from an input terminal 1 and converted into a digital signal by an A / D converter 2. Here, the digitized image signal is usually processed by being divided into a luminance signal and a color difference signal, but in the present embodiment, a description in which the processing system is divided is omitted.

The digitized image signal is compressed by the compression circuit 3 into an information amount according to the recording format. The compression circuit 3 uses a known discrete cosine transform (Discrete C
It is compressed using a technique such as osine transformation (DCT) or variable length coding. The image signal compressed by the compression circuit 3 is subjected to error correction coding processing by the error correction coding circuit 4, and then a pilot signal, a synchronization signal and the like are added by the recording processing circuit 5, and the R of the switch 6 is added. Data is recorded on the magnetic tape 8 by the magnetic head 7 via the terminals.

At the time of reproduction, the image signal recorded on the magnetic tape 8 is converted into an electric signal by the magnetic head 7 and output to the reproduction processing circuit 9 through the P terminal of the switch 6. The reproduction processing circuit 9 generates an operation clock of each unit, detects a synchronization signal, and the like based on the reproduction image signal, and outputs the image signal to the error correction circuit 10. The error correction circuit 10 corrects a code error in the input image signal, and for an image signal including an uncorrectable error, an error flag indicating that fact is given to the interpolation circuit 12.
Output to.

The image signal in which the code error has been corrected is sent to the decompression circuit 11 via the switch 25, restored to the original image signal after being subjected to the decompression processing corresponding to the recording, and output to the interpolation circuit 12. It The interpolation circuit 12 is the error correction circuit 10.
The image that cannot be error-corrected is corrected based on the error flag from the above and output to the D / A converter 13. The image signal whose image has been modified by the interpolation circuit 12 is converted into a D / A converter 13
Then, the digital image signal is converted into an analog image signal, which is output from the output terminal 14 to the outside.

Next, the operation of recording the one screen as a frame image in the memory 23 of the cassette 28 during recording or reproduction of the image signal as described above will be described with reference to the flowchart of FIG.

First, the system controller (hereinafter referred to as "syscon") 16 receives the index instruction from the operation unit 11 in step S101, and the memory read processing circuit 1
8 reads out the data stored in the memory 23 via the R terminal of the switch 24 (step S102). Next, the memory capacity detection circuit 19 detects the capacity M of the memory 23 based on the read data (step S10).
3) The memory write processing circuit 17 and the switch 27 are controlled according to the capacity M (step S104).

First, when the capacity M is smaller than the capacity A (M <A), control is performed so that nothing is recorded in the memory 23 (step S105). When the capacity M is between the capacity A and the capacity B (A ≦ M <B), the frame number designated by the system controller 16 is detected by the frame number circuit 21, and only this frame number is recorded in the memory 21. The memory write processing circuit 17 is controlled so as to do so. in this case,
The switch 27 is open, and the image signal is not recorded (step S106). If the capacity M is greater than or equal to the capacity B (B ≦ M), control is performed so that the frame number designated by the index and the image signal via the changeover switch 26 and the switch 27 are recorded in the memory 23 (step S107). ). At this time, the syscon 16 connects the switch 26 to the a-side terminal when the image signal is being recorded and switches 26 when the image signal is being reproduced from the magnetic tape 8.
Is connected to the b-side terminal.

When the frame number and the image signal are thus recorded in the memory 23, the memory write processing circuit 17 records only the frame number or whether the frame number is recorded together with the image signal. The mode information of is also recorded in the memory 23.

As described above, according to this embodiment,
Since the frame number and the image signal are selectively recorded in the memory 23 according to the capacity M of the memory 23,
It becomes possible to properly use the memory according to the capacity of the memory.

As an example of use in reproducing the image signal and the frame number recorded in the memory 23 in this way, a function of reading out the index number in order from the memory 23 and further reading out the image signal corresponding to the number from the memory 23 is provided. Conceivable. The operation of this function will be described below.

When an index reproduction instruction is issued from the operation unit 15, the syscon 16 controls the memory read processing circuit 18 to read the data from the memory 23, and the frame number detection circuit 22 detects the reproduced frame number.

At this time, when the recording mode detecting circuit 20 detects that only the frame number is recorded based on the mode information, the motor (not shown) records the corresponding frame number on the magnetic tape 8. Then, the image signal recorded on the magnetic tape 8 is reproduced and output from the output terminal 14. Then, while writing the image in a memory (not shown) and repeatedly reading it, the magnetic tape is moved to a position corresponding to the next reproduced frame number while the image is being output for a predetermined time, and the next image signal is reproduced. .

In addition, the recording mode detection circuit 20 has the memory 2
When it is detected that the image signal is recorded together with the frame number in 3, the recording mode detection circuit 20 controls the switch 26 to connect it to the a-side terminal. Then, the image signals reproduced from the memory 23 are sequentially output from the output terminal 14. As a matter of course, at this time, it is not necessary to move the magnetic tape 8, and the user checks the reproduced index image and operates the operation unit 15 when the moving image to be reproduced is recorded. By outputting a signal to that effect to the system controller 16, the magnetic tape can be moved to the portion where the image signal is recorded, and the moving image can be reproduced.

Next, a second embodiment of the present invention will be described. In the first embodiment described above, the case where the image signal is recorded in the memory 23 in a compressed state has been described. However, when the capacity of the memory 21 becomes large, the image signal remains in a non-compressed state with high image quality. It is also possible to record at.
In this embodiment, a digital VTR capable of recording an uncompressed image signal will be described.

FIG. 3 shows a digital VT as a second embodiment.
FIG. 2 is a block diagram showing a configuration of R, and the same components as those in FIG. 1 are denoted by the same reference numerals. The operation of recording an image signal of a certain scene in the memory 23 during recording or reproduction of a moving image signal will be described below with reference to the flowchart of FIG.

In FIG. 4, steps S201 to S20 are performed.
The operations up to 4 are the same as in the case of the first embodiment described above. The operation after detecting the memory capacity M in step S204 will be described below.

If the memory capacity M is smaller than the capacity A, neither the image signal nor the frame number is recorded in the memory 23 as in the above-described embodiment (step S205). When the capacity M is between the capacity A and the capacity B (A ≦ M <B)
Detects the frame number designated by the system controller 16 in the frame number circuit 21 and records only this frame number in the memory 23.
Is controlled (step S206). Also, the memory capacity M
Is between the capacity B and the capacity C (B ≦ M <C), the indexed frame number and the image signal via the changeover switch 26 and the switch 27 are stored in the memory 2.
The recording is controlled to be recorded in No. 3 (step S207). At this time, the syscon 16 connects the switch 26 to the a terminal when the image signal is being recorded, and connects the switch 26 to the c terminal when the image signal is being reproduced from the magnetic tape 8. Finally, when the capacity M is greater than or equal to the capacity C (C ≦ M), and the image signal is being recorded, the syscon 16 switches the switch 29 to b.
The uncompressed image signal and the frame number are connected to the terminal and recorded in the memory 23 (steps S208 and S209). If reproduction is in progress, the switch 29 is connected to the c terminal to record the compressed image signal reproduced from the magnetic tape 8 and the frame number in the memory 23 (step S208,
209). At this time, the mode signal is also recorded as in the above-described embodiment.

In the present embodiment, the recording mode detection circuit 20 controls the switch 30 during reproduction, and when it is detected that an uncompressed image is reproduced from the memory 23, the switch 3
0 is connected to the a side to output the non-compressed image signal from the memory read circuit 18.

As described above, according to this embodiment,
Even when the memory capacity becomes large, the memory can be used more effectively.

Next, a third embodiment will be described. In the above-described second embodiment, when the index image is recorded,
If the memory capacity is large, the uncompressed image signal is stored in the memory 2
Although the case of recording in No. 3 has been described, it is also possible to record a plurality of compressed image signals instead of the non-compressed image signals. Hereinafter, such a third embodiment will be described.

The configuration of the digital VTR in this embodiment is similar to that of FIG. 1, and will be described with reference to the flow chart of FIG.

In FIG. 5, steps S301 to S30
The operations up to 7 are the same as in FIG. When it is detected in step S304 that the memory capacity M is greater than or equal to the capacity C, the image signals for a plurality of screens are recorded in the memory 23 together with the frame number. Further, at this time, mode information indicating that it is a mode in which image signals for a plurality of screens are recorded is also recorded.

As described above, when the memory capacity is large, the memory can be effectively used even if the image signals for a plurality of screens can be recorded.

[0034]

As is apparent from the above description, in the present invention, the capacity of the second memory is detected when the information signal is recorded in the memory means having the first and second memories of different types. By controlling the signal recorded in the second memory according to the capacity, the memory can be effectively used according to the capacity.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration example of a digital VTR as an embodiment of the present invention.

FIG. 2 is a flow chart for explaining the operation of the first exemplary embodiment of the present invention.

FIG. 3 is a block diagram showing another configuration of a digital VTR as an embodiment of the present invention.

FIG. 4 is a flow chart for explaining the operation of the second exemplary embodiment of the present invention.

FIG. 5 is a flow chart for explaining the operation of the third exemplary embodiment of the present invention.

[Explanation of symbols]

 8 magnetic tape 15 operation unit 16 system controller 17 memory write processing circuit 18 memory read processing circuit 19 memory capacity detection circuit 20 recording mode detection circuit 23 memory

Claims (5)

[Claims] 1. An image signal and an addition according to the image signal to a memory means integrally storing a first memory and a second memory of different types each capable of storing an image signal. Recording / reproducing means capable of recording / reproducing a signal, detecting means for detecting a capacity of the second memory, and recording of the image signal or the additional signal in the second memory according to an output of the detecting means. A recording / reproducing apparatus comprising: 2. The first memory is a magnetic tape,
The recording / reproducing apparatus according to claim 1, wherein the second memory is a semiconductor memory. 3. The recording / reproducing apparatus according to claim 1, further comprising a compression unit that compresses the image signal. 4. The control means selectively records the image signal input to the compression means and the image signal compressed by the compression means in the second memory according to the output of the detection means. The recording / reproducing apparatus according to claim 3, wherein 5. The control means further records the image signal reproduced from the first memory by the reproducing means in the second memory in response to the output of the detecting means. 4. The recording / reproducing apparatus according to item 4.