JPH0591454A - Video signal storage input / output device - Google Patents

Abstract

(57) [Summary] [Purpose] To obtain a memory input / output device capable of reading a video signal before and after a certain trigger point. [Structure] Means 2 and 3 for storing input data for a plurality of frames in a storage device 1 by sequentially updating information of one frame or a plurality of fields of a video signal from one frame to a new frame data. When a trigger signal is input, the data is updated by a predetermined number of frames from the time of this input, and then means 2 and 3 for stopping the writing of data to the storage means 1 and the storage means 1 are stored. Means 2 and 3 for sequentially reading the data for a plurality of frames for each desired number of times are provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a video signal storage input / output device for use in a motion analyzer or the like, which stores a video signal when a command is received and can reproduce the video signal repeatedly later. ..

[0002]

2. Description of the Related Art In this type of conventional device, a system for converting a video signal into digital data and storing the data is generally used. Therefore, a digital system will be described here.

FIG. 4 is a block circuit diagram of a conventional device.
In the figure, reference numeral 1 is a storage device for storing input data, which is composed of a first memory 11 and a second memory 12,
Each memory stores data for one or a plurality of frames as one frame. 2 is a memory controller,
Reference numeral 3 denotes an external input control means, which is a selection switch 3s including a switch 31 for transmitting a signal for selecting the memory 11 and a switch 32 for transmitting a signal for selecting the memory 12.
And a read switch 3r for transmitting a write signal for writing data to the memories 11 and 12 and a read switch 3r for transmitting a read signal for reading data from the memories 11 and 12, which is inputted from the outside. "And a read command", the signals are sent to the memory controller 2 at predetermined timings, and the memory controller 2 sends the memory selection signals S1, S2,
Sending the write signal w and the read signal r, the memories 11, 1
Controls data writing to and reading from 2. Reference numeral 4 is a data input terminal, and 5 is an output terminal for the read data.

Next, the write operation will be described with reference to the timing chart of FIG. The input terminal 4 receives data (hereinafter referred to as "one frame data") in which the quantized video signal is divided into a predetermined number of fields and further thinned out at predetermined intervals. This input data is shown in Figure 5.
It shows in (a). In the figure, the numbers in the upper row indicate frame numbers.

If a write command is input from the outside to the external input control means 3 in the middle of the fifth frame, the external input control means 2 actuates the switch 31 to send a memory 11 selection signal to the memory controller 2. Then, the memory controller 2 sends the memory selection signal s1 at the timing shown in FIG.
The switch 3w operates at the timing of the frame, the write signal w is sent from the memory controller 2 at the timing of FIG. 5C, the data of the sixth frame is written in the memory 11, and when the writing is completed, the memory 11 is in a write-protected state.

Next, when a write command is input from the outside during the 16th frame, the external input control means 3 switches the switch 32.
, And the memory controller 2 causes the memory selection signal s
2 is sent out at the timing shown in FIG.
At the timing of (d), the write switch 3w is actuated, the write signal w is sent from the memory controller 2, the data of the 17th frame is written in the memory 12, and when the writing is completed, the memory 12 is set to the write prohibited state. Become.

Next, the data read operation from the memories 11 and 12 will be described with reference to the timing chart of FIG.
When a read command is input to the external input control means 3, the switch 31 is operated and the memory controller 2 causes
As shown in (b), the memory selection signal s1 is sent to activate the memory 11, and the read switch 3r is operated to send the read signal r from the memory controller 2 to read the sixth frame in the memory 11. Data is repeatedly read a predetermined number of times as shown in the first half of FIG.
The switch 32 is operated so that the memory controller 2 sends out the memory selection signal s2 as shown in FIG. 6C to make the memory 12 active, and at the same time, the read switch 3r.
Is operated to read the data of the 17th frame a predetermined number of times as shown in the latter half of FIG.
The operation of reading the data of the frame a predetermined number of times is repeated until the read command is released.

[0008]

Since the conventional video signal storage input / output device is configured to write the data for one frame at the time when the write command is input, the time when the write command is input is set. No earlier data can be stored. Therefore, when used in a motion analyzer, etc.,
If the timing of inputting the write command is delayed even a little, there is a problem that the image of the scene to be reproduced cannot be obtained.

The present invention has been made to solve the above problems, and an object thereof is to obtain a video signal storage input / output device capable of reproducing video signals of frames before and after a write command is input. And

[0010]

The device according to the present invention comprises:
When a write command is received, data for a plurality of frames is written to the storage device by sequentially updating the data from the oldest one, and when a trigger signal is input from the outside, the data is stored for a predetermined number of frames. A means for stopping writing to the storage device after updating, and a read command input,
It is provided with a unit for sequentially reading the data of a plurality of frames written in the storage device a predetermined number of times.

[0011]

In the storage device, data up to a predetermined number of frames before is written from the present time, and when the trigger signal is input, the data is updated by the predetermined number of frames after the input time. , Data writing is stopped.
Therefore, the storage device stores the data before and after the trigger signal is input for each predetermined number of frames. Therefore, by sequentially reading the data stored in this storage device, it is possible to obtain data of a predetermined number of frames before and after the trigger signal is input.

[0012]

EXAMPLES Example 1. 1 is a block circuit diagram of a first embodiment of the present invention, and FIG. 2 is a timing chart for explaining a write operation of the first embodiment. In the figure, storage device 1
Is composed of 16 memories 11 to 116, and each memory stores data for one frame. The memory selection switch 3s of the external input control means 3 is the memory 1
The memory controller 2 includes switches 31 to 316 for selecting 1 to 116, respectively.
When any one of 316 is activated, one of the corresponding memory selection signals s1 to s16 is sent to the memory to be activated.

A first timer 6 determines a period T1 during which the selected memory is in an active state. In this embodiment,
(T1 = 1 frame). Reference numeral 7 denotes a second timer which, when a trigger signal is input from the outside, determines a time T2 for continuing the data writing operation to the storage device 1, that is, how many frames of data are updated. In the embodiment, (T2 =
8 frames). Reference numeral 8 denotes a third timer which, when reading data from the storage device 1, determines a time T3 for reading the data stored in each memory, that is, how many times the same data is read from one memory. Then, (T3 = 2 frames).

Next, the write operation will be described with reference to the timing chart of FIG. Now, a write command is input to the external input control means 3 from the outside, the memory selection signal s1 is sent from the memory controller 2 at the timing of FIG. The data of the first frame shown in a) is written, and then s2 indicating the memory selection is sent at the timing of FIG.
The data of the second frame is written in 2, and the same procedure is repeated thereafter, so that the data of the 16th frame is stored in the memory 1
When the data in the memory 11 is written to the memory 16,
The writing operation is continued by sequentially updating the data from the old data to the current data, such as updating to the data of the th frame.

Next, the data of the 17th frame is stored in the memory 1
When a trigger signal is input from the outside at the timing shown in FIG. 2E while being written in 1, the external input control means 3 causes the memory controller 2 to input the 18th signal next to the trigger signal input time. After writing 8 frames of data from the frame to the 25th frame to the memories 12 to 19 of the storage device 1 by updating the old data, the writing operation is stopped. At this time, data is written from the 18th to the 25th frames in the memories 11 to 19 in the storage device 1, and the 10th to 1st frames are written in the memories 110 to 116.
The data up to the 7th frame is written.

Next, the read operation will be described with reference to FIG. When a read command is input to the external input control unit 3, the external input control unit 3 sequentially performs, via the memory controller 2, the memory 110 in which the oldest data is written among the memories in the storage device 1 in order. The data of the same frame is read twice each, and when the reading of the memory 19 is completed, the reading operation is continued until the reading command is canceled by the procedure of moving to the memory 110 again.

FIG. 3 is a diagram showing the output data read out in this way. The numbers in the upper row show the frame numbers, and T3 is set to 2 frames, so that each is the same twice. The data has been read. As described above, according to the first embodiment, it is possible to reproduce the data of the frames before and after the trigger signal is input.

Example 2. Although the number of memories is 16 in the first embodiment, it can be set to an appropriate number according to the purpose.
Further, although T1 is set to one frame in the first embodiment, it may be set according to the capacity of the memory. Further, although T2 is set to 8 frames and T3 is set to 2 frames in the first embodiment, it goes without saying that both can be set to an arbitrary number of frames. Further, although the video signal is coded and stored in the memory in the first embodiment, the analog signal may be recorded as it is on the recording medium and reproduced.

[0019]

According to the present invention, the information for one or a plurality of fields of the video signal is set as one frame, and the information for a predetermined number of frames is stored by sequentially updating from the old frame and the trigger. When a signal is input, the means for updating the information stored in the storage means by a predetermined number of frames and then stopping the storage operation, and the information of the predetermined number of frames stored in the storage means are respectively stored a predetermined number of times. Since it is provided with a means for sequentially reading the video signals, it is possible to obtain a video signal storage input / output device capable of reproducing the information of a plurality of frames before and after the time point when the trigger signal is input from the storage means.

[Brief description of drawings]

FIG. 1 is a block circuit diagram showing a first embodiment of the present invention.

FIG. 2 is a timing chart for explaining the write operation of the first embodiment.

FIG. 3 is a diagram showing output data of the first embodiment.

FIG. 4 is a block circuit diagram of a conventional video signal storage input / output device.

FIG. 5 is a timing chart for explaining the write operation of this conventional example.

FIG. 6 is a timing chart for explaining a read operation of this conventional example.

[Explanation of symbols]

 1 Storage Device 2 Memory Controller 3 External Input Control Means 6 First Timer 7 Second Timer 8 Third Timer

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[Procedure amendment]

[Submission date] December 9, 1991

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] 0003

[Correction method] Change

[Correction content]

FIG. 4 is a block circuit diagram of a conventional device.
In the figure, reference numeral 1 is a storage device for storing input data, which is composed of a first memory 11 and a second memory 12,
Each memory stores data for one or a plurality of fields as one frame. 2 is a memory controller, 3 is an external input control means, and a selection switch 3 s composed of a switch 31 for sending a signal for selecting the memory 11 and a switch 32 for sending a signal for selecting the memory 12, and to the memories 11 and 12. Write switch 3w for sending a write signal for writing data, and memories 11 and 12
"Write command" which is composed of a read switch 3r which sends out a read signal for reading data from
And a "read command", signals are sent to the memory controller 2 at predetermined timings, and the memory controller 2 outputs the memory selection signals S1, S at predetermined timings.
2. Sending the write signal w and the read signal r to the memory 1
Data writing to and reading from the data 1 and 12 are controlled. Reference numeral 4 is a data input terminal, and 5 is an output terminal for the read data.

[Procedure Amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0014

[Correction method] Change

[Correction content]

Next, the write operation will be described with reference to the timing chart of FIG. Now, a write command is input to the external input control means 3 from the outside, the memory selection signal s1 is sent from the memory controller 2 at the timing of FIG. The data of the first frame shown in a) is written, and then the memory selection signal s2 is transmitted at the timing of FIG.
The data of the second frame is written in 2, and the same procedure is repeated thereafter, so that the data of the 16th frame is stored in the memory 1
When the data in the memory 11 is written to the memory 16,
The writing operation is continued by sequentially updating the data from the old data to the current data, such as updating to the data of the th frame.

[Procedure 3]

[Document name to be amended] Statement

[Correction target item name] 0018

[Correction method] Change

[Correction content]

Example 2. Although the number of memories is 16 in the first embodiment, it can be set to an appropriate number according to the purpose.
Further, although T1 is set to one frame in the first embodiment, it is necessary.
It may be arbitrarily set as necessary. Also, the period of T1
May be longer than can be stored in memory. That is,
The period of T1 is determined only according to the memory capacity.
For example, set T1 to 5 fields and set 1
The memory capacity of may have only one field. Me
If the memory capacity is exceeded, the same
Overwrite the memory again. Further, although T2 is set to 8 frames and T3 is set to 2 frames in the first embodiment, it goes without saying that both can be set to an arbitrary number of frames. Further, although the video signal is coded and stored in the memory in the first embodiment, the analog signal may be recorded as it is on the recording medium and reproduced.

 ─────────────────────────────────────────────────── ─── Continued Front Page (72) Inventor Takafumi Inatomi 1-16-12 Minamitsukaguchi-cho, Amagasaki City Suntec Corporation

Claims (1)

[Claims] 1. A means for storing information for a predetermined number of frames by sequentially updating information for one or more fields of a video signal as one frame from an old frame, and a point of time when a trigger signal is input. Means for updating the information stored in the storage means by a predetermined number of frames, and then stopping the writing operation, and the information for a plurality of frames stored in this storage means are sequentially read a predetermined number of times for each frame. A video signal storage input / output device having a means.