KR0130809B1 - Insert editing device in digital vcr - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a digital VRL editing apparatus, and more particularly to a digital VAL insert editing apparatus capable of accurately determining an editing position during insert editing. Compared to the conventional insert edit of a signal applied from the outside to the audio sector, video sector, and subcode sector based on the SSA of the ITI sector when insert editing of digital V-C is used, This provides the advantage of accurately determining the insert editing position relative to the sync section.

Description

Digital V's Insert Editor

1 is a state diagram showing a general tape recording pattern.

2 is a block diagram showing a conventional insert editing apparatus for digital V-C.

3 is a detailed configuration diagram showing a conventional recording / reproducing switching signal generation section 26 in detail.

4 is a detailed block diagram showing a recording / reproducing switching signal generating unit according to an embodiment of the present invention.

* Explanation of symbols for main parts of the drawings

41, 42, 43: comparator 32: audio counter

33: video counter 34: sub code counter

35: data selector

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an editing apparatus for digital VRLs, and more particularly, to an insert editing apparatus for digital VSIs capable of accurately determining an editing position at which insert editing is to be performed.

In general, insert editing in a VCR means that only a specific track is put again with another signal on the already recorded tape. In particular, in a D-VCR, when data having different characteristics such as audio, video, and subcode are recorded in different areas of a track, it is possible to insert and edit audio, video, and subcode independently. .

1 is a state diagram showing a general tape recording pattern. This tape recording pattern will be described briefly. In a tape having a configuration as shown in FIG. 1, one track includes data of an ITI (Insert and Track Information) sector, an audio sector, a video sector, a subcode sector, and the like. It consists of. The audio and video sectors are used to record audio data, audio AUX data, video data and video AUX data, respectively. The subcode sector is used to record data related to the system, such as time code and record date / time. On the other hand, the ITI sector is configured to obtain overall track information and timing information at the time of insert editing. The preambles PRE1, PRE2, PRE3 and postambles POS1, POS2, POS3 of each sector are well clocked in a phase locked loop (PLL) circuit during reproduction. This is an area where data patterns are recorded so that they can be extracted. Between the preamble and the postamble of each sector, an edit gap (G1, G2, G3) in which there is no recording of interval data is located to distinguish between audio and video sectors. These gaps are used for protecting data in each area by inserting a margin between the data areas when insert editing. In other words, this gap allows a slight change since the starting point of each sector of the original track at the time of editing cannot coincide, so that the data of each sector is not damaged. The insert editing operation in the D-VCR having the track structure as described above is performed by a circuit having the configuration as shown in FIG.

FIG. 2 is a block diagram showing a conventional insert editing apparatus for digital VR. The editing apparatus shown in FIG. 2 will be briefly described. At the time of reproduction, the head 22 reads the recorded signal from the tape 21 and outputs it to the recording / reproducing amplifier 23. A switch SW is connected to the rear end of the recording / reproducing amplifier 23 so as to be switched in accordance with the control signal of the recording / reproducing switching signal generator 28 to read data read from the tape 21 into the reproduction equalizer 24. ) The signal passing through the reproduction equalizing unit 24 is applied to the PLL unit 25. The PLL unit 25 compensates the amount of attenuation of the applied data and outputs it to the reproduction signal processing unit 26. The recording signal processing section 26 performs signal processing to output the applied signal to be reproduced.

Insert editing is possible during recording. The recording signal processor 29 receives a signal to be recorded from the outside, processes the signal, and outputs the signal to the modulator 27. The modulator 27 modulates the applied recording data into a form suitable for recording on the tape 21. The output terminal of the modulator 27 is connected to the switch SW. The output signal of the modulator 27 is transmitted to the recording / reproducing amplifier 28 by the recording control signal of the recording / reproducing switching signal generator 28. The head 22 writes a signal to the tape 21. At this time, the recording / reproducing switching signal generation unit 28 receives the start synchronization block number (a) of the SSA of the start sync block area (SSA) of the ITI sector from the PLL unit 25 to insert insert timing. The signal is generated, and the insertion region information signal b is received from the controller not shown in the drawing, and the insert is edited at the corresponding position. Detailed configuration thereof is shown in FIG.

3 is a detailed configuration diagram showing the recording / reproducing switching signal generation section 26 in detail. The starting sync block number of the ITI sector is 0 to 60. In known technology, the count times for distinguishing the audio, video, and subcode areas from the SSA of the ITI area are specified in the D-VCR standard. For example, when insert editing only the video area, the start synchronization block number a of the SSA applied from the PLL unit 25 is set to 50. The comparator 31 counts the clock until the sync block number reaches 50, and generates a matching pulse when the start sync block number reaches 50. The comparator 31 outputs this matching pulse to the audio counter 32, the video counter 33, and the sub code counter 34. The audio counter 32, the video counter 33, and the sub code counter 34 are provided with a comparator internally. Each of these counters 32, 33, and 34 receives an external clock (OSC CLK) to determine the time value of the audio, video, and subcode areas based on the point that the matching pulse becomes high (H). Count. The audio counter 32 counts the number of clocks according to the required time of the preset audio area, and makes the output signal high when the audio area starts. At the end of the audio region, the output signal is set low (L). The video counter 33 and the sub code counter 34 also operate similarly. The data selector 35 receives an insertion region information signal b from a controller not shown in the figure. For example, when insert editing only the video area, the data selector 35 selects only the output value of the video counter 33 among the outputs of the counters and performs the insert editing at the corresponding position when the video insertion area information signal is applied.

In the above-described prior art, count times are defined in which the head of the VCR distinguishes audio, video and subcode areas from the SSA of the ITI area on the track during recording and playback. In practice, however, the insertion of the VCR's drum motor may cause rotation of the VCR's drum motor. Difficult to see This problem is particularly severe in sectors farther away from the SSA, making it more difficult for video sectors to match the beginning and end of insert editing in subcode sectors than in video sectors.

Accordingly, an object of the present invention is to add a plurality of comparators to the front end of each counter to solve the above-mentioned problem, and to use the point that the postamble is present at the end of each sector to start the next sector from this postamble. It is to provide an insert editing device of the digital VDL can be found.

In order to achieve the above object, a feature of the present invention is to edit a digital V-CD for insert-editing a recording signal from the outside on a tape composed of predetermined sectors. A recording / playback signal generator which detects the start of the reference sector from the start sync block number to move, and outputs a signal for determining the insert edit position based on the last sync of the sector immediately preceding the start sync each sector. It is in the insert editor of the digital VCL that contains it.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

4 is a detailed block diagram showing a recording / reproducing switching signal generation unit according to an exemplary embodiment of the present invention. The configuration of the present invention includes all of the configuration diagrams of FIG. 3 and includes a second comparator 42 at the front end of the video counter 33 and a third comparator 43 at the front end of the sub code counter 34. It is composed.

Data of the audio, video, and subcode areas may be divided into respective areas by a sync block number. The sync block numbers 0 to 16 are data of the audio region, the sync block numbers 17 to 168 are data of the video regions, and the sync block numbers 169 to 180 are subcode data. In addition, each of the sync blocks has an identification code. These ID codes contain information of the current sync block number. Therefore, this information is used to detect the audio postamble at the end of the audio block and the video postamble at the end of the video block, and to count the section to be newly inserted and edited. When a signal is generated, this information is obtained from the head position on the tape, at the end of the audio sector and at the end of the video sector. Using this information, an embodiment of the present invention will be described with reference to FIG. In FIG. 4, first comparator 41 is first granted start sync block number a. In an embodiment, if the matching clock is 50, the first comparator 41 receives the start sync block number a in the same manner as the conventional method and outputs the matching clock. That is, to find the start of the audio sector area from the start sync block number of the SSA, the first comparator 41 counts until the sync block number # 50 is reached, and generates a matching pulse when the start sync block number reaches 50. Do it. The audio counter 32 receives this matching pulse and counts it according to a clock (OSC CLK) applied from the outside to detect a preset audio start and end. That is, the audio counter 32 applies the number of clocks according to the required time of the preset audio area so as to make the output signal high when the audio area starts. At the end of the audio region, the output signal is set low (L). The video counter 33 detects the video area on the basis of a signal when the last sync block number of the audio area is obtained, that is, when the head scans the last part of the audio area. As shown in FIG. 4, the second comparator 42 receives the sync block number and counts it until it becomes the sync block number indicating the start of the video sector area. When the sync block number reaches 16, the second comparator 42 generates a counter start pulse. Serve In this embodiment, the sync block start number of the video area is 16, and the sync block start number of the sub code area is 168. Similarly, the third comparator 43 receives the sync block number and generates a counter start pulse when the sync block number indicating the start of the sub code sector area reaches 168. The data analyzer 35 receives the output signals of the counters 32, 33, and 34, receives the insertion region information signal b from the controller not shown in the drawing, and selects the output signal of the corresponding counter. A control signal is output to insert a recording signal into the area.

According to another embodiment of the present invention, in the configuration as shown in FIG. 4, other sync block numbers in the video area are not referred to as the last 16 sync blocks of the audio sync blocks or the last 168 sync blocks of the video sync blocks. You can also use. Here, the value to be counted by the counter varies depending on which sync block number is the reference.

As described above, the present invention relates to an apparatus for editing a digital VCD. In particular, when insert editing is performed, insert editing of signals applied from the outside to an audio sector, a video sector, and a sub code sector is performed based on the SSA of an ITI sector. Compared to the present invention, the present invention provides an advantage of accurately determining the insert editing position based on the last sync portion of the immediately preceding sector of each sector.

Claims (2)

A digital V-Cal editing apparatus for insert-editing a recording signal from the outside on a tape composed of predetermined sectors, the sector being a reference from the start synchronous block number to move the position of the head to the insert editing start point of the tape. And a recording / playback signal generator for detecting a start portion of the start sync signal and outputting a signal for determining an insert edit position on the basis of the last sync portion of each sector immediately before the start sync sector. 2. The apparatus of claim 1, wherein the recording / reproducing signal generation unit comprises: a first comparator for generating the matching pulse as a reference for counting the start synchronous block number and detecting an audio sector area as a reference sector when editing the insert; A second comparator for generating a matching pulse as a reference in detecting a video sector area based on the last sync block number of the audio sector area; A third comparator for generating a matching pulse as a reference in detecting a sub code sector based on the last sync block number of the video sector area; An audio counter which receives the matching pulse from the first comparator and counts according to a clock applied from the outside from the time point and detects the audio area by comparing with a clock counting value of a preset audio area; A video counter which receives the matching pulse from the second comparator and counts according to a clock applied from the outside to detect the video area by comparing with a clock counting value of a predetermined video area; A sub code counter which receives the matching pulse from the third comparator and counts according to a clock applied from the outside from the time point and detects the sub code area by comparing with a clock counting value of a preset sub code area; And a data selector for selecting and outputting one of the respective insert editing sections outputted from the counters according to an insertion region information signal applied from the outside.