JPS5853004A - Retrieval controlling system - Google Patents

Abstract

PURPOSE:To prevent retrieval mistake, by dividing a tape mark signal into minute signals, recording a tape mark number representing a tape mark discriminating signal and the minutely divided number and stopping a reproducing operation at the point of time of discrimination of a designated tape mark number. CONSTITUTION:A TM number TMh is recorded by dividing a unit TM behind a header (h) of the tape mark TM. At high-speed retrieval, the period (h) only is recognized and the header (h) of the specified TM is detected, then a normal constant-speed reproducing mode is obtained and the TMh is discriminated. The number of the TMh when the mode is transferred to the constant-speed reproducing mode is denoted as (n), the reproducing mode is kept continuously without being stopped at the point of time, the TMh is counted at the steady state speed and the mode is stopped at a prescribed number N. Thus, the point of time in detecting the TM and stopping at the high-speed reproduction is always at the end of the TMh, that is, the location of the TMh=N.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is directed to a method of configuring a tape mark signal and a search control method to be written after recording an Iji image in an apparatus for recording and reproducing Digimel images using a VTR.

Magnetic tapes and magnetic disks are common devices for recording image data that can be digitized.

Both devices are usually used in conjunction with one controller, so the entire device is large, and brass media, especially magnetic disks, are large and pose problems in transportation, storage, etc.

Front storage capacity is 2400 feet, 1600 B
If a pI standard magnetic tape is approximately 46 MB in size, and the amount of information in the ML A9J is 2M (512 pixels x 512 lines x 8 bits), only 23 pieces can be wired.

However, in the digital data recording device using the VTR proposed in the present invention, a storage capacity of about 150 times that of one roll of magnetic tape, that is, 7200 M8 can be obtained, as shown below.

The frequency band of V'l'R can be secured at 2 mm, and therefore a storage rate of 2 Mb/* can be achieved with certainty.

Therefore, if you use a cassette chip for one hour, the total storage capacity will be 3
600 x ZB&/s depth 7200 M-ro.

In other words, it is promising as an LDI data storage wiring system because it can achieve a 1IIIvR degree about 150 times that of magnetic tape.

However, since 3,600 images can be stored with zero coverage, high-speed retrieval is always required during playback.

Commercially available household VCRKs are equipped with a standard feature called ``Victure Nate,'' which is usually 0.20 to 30 times the size of the shield.

In order to perform image retrieval using this 20 to 30 times high-speed playback mode, the conventional tape mark period is recorded for a predetermined length or more, and the tape mark signal waveform is converted into a simple signal with no signal or a single tone. 19 as a waveform.

The conventional Zomat is shown as the first cause.

FIG. 1 shows a case where no signal is used as a tape mark.

FIG. 1 1) shows the initial recording state.

jI1 figure b) searches for 1Ili1 person in high-speed playback mode, detects TMb after a circle, stops once, and displays image B.
It is a diagram showing a case where 1ii111Ct is erased and 1ii111Ct is deleted.

Tagmark in 1)! As described above, the ia recording period 2T is sufficient time to detect TM during high-speed playback.

However, in 7 shown in b), in order to skip playback when detecting the TM that is present in the image 11A,
This shows that T'<T.

7 is the VTR used and actual running speed.

It changes depending on the tape position, so the first
Re-search the state part of figure b) and image A in case 9-)
Rounding in which the TM period 7 after is shorter than the predetermined length T,
There are cases where it cannot be detected during high-speed playback.

Therefore, images A and B cannot be distinguished, leading to search errors.

According to the present invention, the above-mentioned search does not occur during high-speed image search.

Examples of the present invention will be described below.

Figure 812 is a diagram showing the wiring and format according to the present invention, and H and h are the ninth header signals for classifying the image and tape mark, respectively.

The gist of the present invention is to divide the unit TM and record the TM book number TMh after the TM header and digit.

In the embodiment shown in FIG. 2, the arrangement is such that 'rMk proverbs, z, . . . , even turtles are arranged.

At the time of high-speed search, only the @h' period is recognized, and when the header ""h" of a predetermined TM is detected, the program enters the normal short continuous playback mode and separates the TMmtll.

As mentioned above, when transitioning from high-speed reproduction to constant-speed reproduction mode, it is not possible to unambiguously determine at which position TMk is located from 1 to N.

According to the present invention, the transition to the constant speed reproduction signal
In general, the number of T is set to 1fi'', and instead of stopping at that point, the device is configured to go into a replay mode, count T at a steady speed, and stop when it reaches a predetermined value N.

Therefore, during high-speed playback, KTM is detected and stopped.
111 A Ha'l K TMb Q) MII t l
It is possible to set k b 'Can' rMk -N O position t.

That is, by setting the TM period to a certain length or more, the problem of the TM period being shortened due to repetition of the read/playback cycles as in the conventional example is eliminated.

FIG. 3 shows a block diagram of an embodiment according to the present invention.

The reproduced signal: 1 detects the tagging signal TM recorded between the image signal and the image g1 at the TM detection step: 2, and then detects the predetermined value M: 4 at the next stage Hisoji: 3. compared to

For example, if the search playback position is M-=@1G and the specified search position is M-15, the predetermined value M is set as the intestine, and if they match, the constant speed control signal=S is output.

In the high speed search mode, at the same time as the constant speed control signal=5 is output, the reproduction signal:l also becomes a constant speed reproduction signal.

TM detection is the same as above even in constant speed driving mode.
and comparison is performed, and if the predetermined search position is detected,
Constant speed control signal: 5 will be output in the middle, but in this case there will be no speed change of the reproduced signal.

If the constant speed control signal cannot be detected, the switch circuit 26 outputs a reproduction signal.

For the signal output from switch 26, the header @h'' of the tape margin number is classified by the detection circuit near, and only the TMk signal portion is outputted by the tape margin number (TMb) gate:8.

Tub detection circuit = 9 identifies TMk, comparison circuit: 1
0 is compared with a predetermined value N:11, and if they match, a stop control signal=12 will be output.

The predetermined value N is generally selected to be the maximum value of TN.

As shown in the above embodiment, according to the present invention, in an apparatus for recording and reproducing digital images using a commercially available home VCR, a tape mark signal located between K111m during high-speed reproduction is detected, When searching for an image, by dividing the tape mark part and adding a number (TMh) to identify the details, you can roughly detect the tape mark in high-speed playback mode and switch to constant speed mode 1°. After that, the tape mark number can be identified by rounding, and then the playback can be stopped at the final position of TMh.

Therefore, the TM period does not decrease due to repeated recording and reproduction, and the problem of TM detection detection during high-speed reproduction as in the conventional example does not occur.

[Brief explanation of the drawing]

FIG. 1 shows a conventional image, a chive 1-recording format, and a recording format in a case where new *Kim* and tape mark recording are performed after high-speed playback. FIG. 2 shows a recording format according to an embodiment of the present invention.
FIG. 3 is a reproduction block diagram. 1: Reproduction signal, 2: TMM output circuit, 3: Comparison circuit, 4: Search TM value - 5: Constant speed control signal,
6: Switch, 7: TM to @h''' detection link,
s: TMM gate circuit, 9: TMM detection circuit,
lO: Comparison circuit, ll: Predetermined 1M9 value N. 12: Playback stop control signal. Agent Patent attorney Nori Chikamaro Yu' (and 14 others)
) Figure 1 Figure 2

Claims (1)

[Claims] When a VCR is used to store tape mark signals between frames in a digital image recording/reproducing device and used for retrieval control, each tape mark signal is subdivided into tape mark identification signals and the subdivided number of runs. 4. Wire the tape mark signal to monotonically decrease or monotonically increase, and during playback, stop the playback operation at the specified time
Search control method with $11.