JP2003228961A - Device and method for detecting editing point - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a highly reliable editing point detecting device which neither performs the wrong detection of an editing point nor has an omission of detection. <P>SOLUTION: On a recording carrier 1, a time code is recorded together with video and audio signals. In pre-rolling from the editing point to a point which is several seconds precedent, this time code is read and a plurality of time codes including the time code of the editing point are stored in a storage means 5. In editing operation, a time code is read out of the recording carrier 1 again and a pattern matching means 8 compares it with the time codes stored in the storage means 5 to decide their similarity and then outputs a detection signal. Even if time codes are discontinuous or some of time codes can not be read or are read by mistake, the editing point can accurately be found. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a magnetic tape, an optical
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording / reproducing apparatus using a magnetic disk or the like, and particularly to an editing point detecting device and an editing point detecting method in an editing apparatus that requires accurate editing work.

[0002]

2. Description of the Related Art FIG.
It is explanatory drawing showing the general operation | movement when editing in TR. An example of assemble editing in which another material is connected from an editing point (A in the drawing) and recorded will be described. First, using the variable speed playback function of the VTR, looking for the point (editing point) to connect while looking at the screen, memorizing the time information (time code) at that location, and then a few seconds before the editing point (in the figure, Preroll to B) and wait. afterwards,
The VTR is started according to another material input to the VTR, and it is detected that the time code on the tape coincides with the time code of the editing point that was remembered earlier during the run, and recording is started. As described above, the assemble edit operation is realized by switching to the recording operation based on the time code of the edit point.

[0003]

However, in the above-mentioned conventional edit point detecting device in the recording / reproducing apparatus, for example, the same time code is detected twice because of discontinuity of the time code in the run-up period (B to A). If some of the timecodes cannot be read or if some of them are read by mistake, there is a possibility that the edit point may be wrong or may not be found.

Therefore, an object of the present invention is to accurately set an edit point or a cue point even when there is discontinuity in time code, some time codes cannot be read, or some are erroneously read. An edit point detection device and an edit point detection method that can be found are provided.

[0005]

In order to solve the above-mentioned problems, an edit point detecting device of the present invention comprises a storage means for reading and storing a plurality of time information recorded on a record carrier, and again from the record carrier. Pattern matching means for reading the time information, comparing the time information with the time information stored in the storage means, determining the degree of similarity, and outputting a detection signal.

As a result, even if a discontinuity point, undetectable or erroneous detection occurs in the time information, accurate edit point detection can be performed.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION A first aspect of the present invention is to provide a storage means for reading and storing a plurality of time information recorded on a record carrier, and the time information of the storage means for reading the time information again. And a pattern matching unit that determines the degree of similarity and outputs a detection signal.

The second invention of the present invention is the same as the first invention, wherein the pattern matching means reads the time information and sequentially compares the time information with the time information stored in the storage means. It is characterized in that the detection signal is output by determining that they coincide with each other.

The third invention of the present invention is the same as the first invention, wherein the pattern matching means reads the time information and compares it with the time information stored in the storage means and the read time. Is determined and the detection signal is output.

Further, a fourth invention of the present invention is characterized in that, in the above-mentioned first invention, said storage means stores only time information of an edit point and time information near a discontinuity point. is there.

The fifth aspect of the present invention is based on the above first to first aspects.
The fourth invention is a method invention.

According to the above invention, the similarity of the time information up to the editing point is judged by pattern matching and the detection signal is output instead of the judgment of the coincidence or non-coincidence of the time information at the editing point. Even if there is continuous detection, undetectable detection, or erroneous detection, the editing point detection accuracy can be improved. Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(Embodiment 1) FIG. 1 is a block diagram showing a configuration example of an editing point detecting device according to Embodiment 1 of the present invention. It is also an example of implementing the edit point detection method of the present invention.

In FIG. 1, 1 is a record carrier such as a magnetic tape, 2 is a read head, 3 is time information reproducing means, 4
Is a switch, 5 is a storage means, 6 is a shift register, 7 is a determination circuit, and 8 is a pattern matching means having the shift register 6 and the determination circuit 7.

The operation of the edit point detecting device constructed as described above will be described below, taking VTR assemble editing as an example.

Pre-recorded information signals such as video and audio are read from the magnetic tape 1 through the reading head 2 and output through a signal processing circuit (not shown) such as a signal demodulation circuit and an error correction circuit. It Similar to the conventional example, V
Use TR's variable speed playback function to find points (edit points) to connect while monitoring demodulated video and audio. At this time, the read information signal is connected to the time information reproducing means 3, and the time code (hereinafter, abbreviated as TC) as the time information at the time of recording is demodulated in accordance with video and audio. After confirming the edit point, switch 4 is closed,
The TC of the edit point is input to and stored in the storage means 5.

After that, the image is prerolled at a low speed to a position several seconds before the edit point and stands by. The TC reproduced during the preroll period is stored in the storage unit 5. That is,
In the storage means 5, TC during the pre-roll period of several seconds before the editing point is continuously recorded. After the preroll, the switch 4 is opened.

Next, the VTR is started in accordance with another material input to the VTR, and the TC on the tape reproduced during the run is sequentially input to the pattern matching means 8 via the time information reproducing means 3. . The input TC is output to the determination circuit 7 via the shift register 6. In the judgment circuit 7, the storage means 5 recorded in the pre-roll feedback is recorded.
It is sequentially compared with the TC of (1), and it is detected that the TC of the editing point is the same, and a detection signal is output, whereby recording is started. In this way, before the edit point, a predetermined number of TCs are stored in the storage means 5, compared with the TC being reproduced, and the similarity is judged to detect the edit point.

More specifically, if k (k is an integer of 2 or more) TCs are stored in the recording means 5, the shift register 6 outputs k TCs being reproduced. . Since the output of the shift register 6 is updated sequentially, if k TCs match, it means that the edit point is detected.

As described above, in the present embodiment, since the edit point is detected from the similarities of a plurality of TCs before the edit point, even if there is a discontinuity in the TC on the tape, the edit point is accurately detected. You can find edit points. That is, since the comparison determination can be performed with the discontinuous TC pattern, the edit point can be accurately detected.

The judgment criteria (similarity) in the judgment circuit 7
May be determined by perfect matching or by matching a predetermined number or more.

(Second Embodiment) Next, an edit point detecting device according to a second embodiment of the present invention will be described with reference to the drawings. In the present embodiment, a case will be described as an example in which a recording / reproducing apparatus such as a VTR performs after-recording editing (hereinafter referred to as post-record editing) of audio in accordance with a video recorded on a tape. The configuration of the main part is the same as that shown in FIG.

FIG. 2 is an explanatory diagram of the editing operation. Normal 2
The editing operation is realized by intermittently performing the reproducing operation and the recording operation at a speed more than double, and pre-reading and re-recording the same portion on the tape in real time. Video data pre-read at high speed on the tape is converted to normal speed via a memory (not shown) and output to the outside. Similarly, voice dubbing data input from the outside is also stored in the memory, and after rewinding, the dubbing data is recorded at a high speed from the editing point by accelerating after the rewind.

At the time of pre-reading, TC associated with the video signal is read out from the m frame (m ≧ 2) before the editing point and recorded in the storage means 5.

In the present embodiment, the recording means 5 and the pattern matching means 8 are realized by software processing by a microcomputer. Therefore, the TC for the front m frames is stored in the memory in the microcomputer.

The edit point is detected by, for example, TC of m frames recorded at the time of pre-reading from edit point A to edit point C.
Is compared with TC read in the run-up periods D to C,
The edit point C will be detected.

FIG. 3 is a flow chart of the pattern matching processing program in this embodiment.

When the run-up starts, the pattern matching process is started, and after resetting the counter value n in the microcomputer, the read TC and the TC stored in the memory at the address indicated by the counter value are compared, and if they match, , The counter value n is incremented (+1) and sequentially compared with TC in the memory. The counter value n is incremented, it is determined that the number (m) of TCs stored in advance is reached, and a detection signal for cueing is output.

Here, the reproduction time from the start to the end of the pattern matching is further detected, and when the time is shorter than the presumed run-up time (predetermined time), a warning display is given to give a reliable result. It is increasing the nature. For example, assuming that the run-up time is 2 seconds, if pattern detection is started and the detection signal is reproduced in 1 second,
Since there is a high possibility that the detection is incorrect due to a discontinuity point, a warning is displayed.

In the case of warning, the pattern matching process may be performed again.

(Third Embodiment) Next, an editing point detecting device according to a third embodiment of the present invention will be described with reference to the drawings. The present embodiment is an example in which the memory amount of the recording means is reduced.

For example, if the TC in the m frame to be stored immediately before the edit point has a discontinuity, only the TC near the discontinuity point and the TC at the edit point are stored. That is, if a discontinuous point is detected while monitoring the TC at the time of recording, for example, the TCs before and after that may be stored. Of course, the TC of the edit point is stored.

The pattern matching process for the items thus stored will be described below.

FIG. 4 is a flowchart of the pattern matching process according to this embodiment.

When it is detected in advance that the TC before the editing point is pre-read, it is confirmed that the read TC, the TC immediately before the discontinuity point, and the TC immediately after the discontinuity point are sequentially matched. After that, the TC at the edit point is detected and a detection signal is output.

First, it is judged whether or not there is a discontinuity point in the TC, and if there is no discontinuity point, the routine proceeds to a routine for checking that the TCs of the editing points coincide. If there is a discontinuity point, the TC is read and it is determined whether or not it matches the stored TC immediately before the discontinuity point. If they match, the next TC is read, and it is determined whether or not it matches the stored TC immediately after the discontinuous point. With this routine, the discontinuity point can be accurately determined. Then, it is determined whether the TCs of the editing points match.

By storing the TCs before and after the discontinuity point in this way, the discontinuity pattern can be stored with a small memory amount, and even if the same TC as the edit point is detected before the discontinuity point, a malfunction occurs. Edit points can be detected without doing.

In addition to the method of pattern matching described in the first to third embodiments, as an algorithm of the pattern matching means, the TC series stored in the storage means and the TC series read again are compared. It can also be configured to calculate the number of relations. This makes it possible to make an accurate determination even when a part of the TC cannot be read or a part of the TC is erroneously read.

As a result of the operation according to each of the embodiments described above, since the edit point is detected from the similarities of a plurality of TCs before the edit point, the TC on the tape has a discontinuous portion, Even when a part of the TC cannot be read or a part of the TC is erroneously read, the edit point can be accurately found. In addition, by detecting that the reproduction time is longer than the predetermined time, it is possible to further improve the reliability. Further, TC can be realized with a small memory by storing only the time information near the discontinuity point and the edit point.

The algorithm for calculating the similarity is
The present invention is not limited to the example shown here, and modifications can be made without departing from the spirit of the invention.

For example, when the TC to be read cannot be read, the protection by interpolation by a method such as linear interpolation may be used together.

In addition, in detecting the editing point, it may be convenient to detect a few frames before the editing point in preparation for the next recording. In that case, a plurality of TCs before that point may be stored.

Although the editing has been described as an example, the present invention can be similarly applied to the case other than the editing when the point corresponding to the editing point is searched for by the time information.

Further, the recording / reproducing apparatus is not limited to a tape, and may be an optical disk, HDD or the like.

Further, the time information is the time code,
The information is not limited to this as long as the information has the same effect.

[0046]

As is apparent from the above description, according to the present invention, the storage means for reading and storing a plurality of time information recorded on the record carrier, and the time information in the storage means for reading the time information again. Even if the time information has discontinuity, part of the information could not be read, or was mistakenly read, the edit point is accurately compared with the information by judging the degree of similarity and outputting the detection signal. Can be found.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of an edit point detection device according to a first embodiment of the present invention.

FIG. 2 is an operation explanatory diagram of the editing point detection device according to the first embodiment.

FIG. 3 is a flowchart of a pattern matching unit of the editing point detection device according to the second embodiment.

FIG. 4 is a flowchart of pattern matching means of the editing point detecting device according to the third embodiment.

FIG. 5 is an operation explanatory diagram of an edit point detection device in a conventional recording / reproducing device.

[Explanation of symbols]

1 record carrier 2 heads 3 hours information reproduction means 4 switches 5 storage means 6 shift registers 7 Judgment circuit 8 pattern matching means

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Kenichi Honjo             1006 Kadoma, Kadoma-shi, Osaka Matsushita Electric             Sangyo Co., Ltd. F-term (reference) 5C018 AA02 AA06 AB01 AC08                 5C053 FA14 FA21 HB10 JA21 JA24                       KA05 KA21                 5D110 AA04 AA26 AA28 BB11 BB20                       CA05 CA06 CB01 CC03 CD05                       CE06 DF04

Claims (8)

[Claims] 1. Storage means for reading and storing a plurality of time information recorded on a record carrier; and again reading the time information, comparing the time information with the time information in the storage means, and judging and detecting the degree of similarity. An edit point detection device comprising a pattern matching means for outputting a signal. 2. The pattern matching means reads time information, successively compares the time information with the time information stored in the storage means, determines that a predetermined number of consecutive matches, and outputs a detection signal. The edit point detection device according to claim 1. 3. The pattern matching means reads the time information, determines the degree of similarity with the time information stored in the storage means, and the length of the read time, and outputs a detection signal. The edit point detection device according to claim 1. 4. The edit point detection device according to claim 1, wherein the storage means stores only time information about the edit point and time information near the discontinuity point. 5. A storage step of reading and storing a plurality of time information from a record carrier, and the read time information,
And a pattern matching step of comparing the stored time information, determining the degree of similarity, and outputting a detection signal. 6. The pattern matching step reads the time information, sequentially compares the time information with the time information stored in the storage step, and determines that a predetermined number of consecutive matches have occurred and outputs a detection signal. The edit point detection method according to claim 5. 7. The pattern matching step is characterized in that the time information is read, the degree of similarity compared with the time information stored in the storage step and the length of the read time are determined, and a detection signal is output. The edit point detection method according to claim 5. 8. The edit point detection method according to claim 5, wherein the storage step stores only time information about the edit point and time information near the discontinuity point.