JPH0218773A - Magnetic recording and reproducing device - Google Patents

Abstract

PURPOSE:To improve editing efficiency by separating a time code in a master side with being synthesized to a video insert frame in a source side, keeping a users bit information in the master side and recording the time code and users bit information to a same frame position in the master side. CONSTITUTION:The time code in the master side is separated with being synthesized to the frame of an insert processing object for a video signal in the source side and the users bit information in the master side are kept to a memory 14. The time code and users bit information are synthesized to the frame in the source side and recorded to the same frame position in the master side. Accordingly, when the video signal is inserted, the time, minute, second and frame information in the data of a time code signal are converted with causing a position to be coincident on the linear track of the insert object. Then, the users bit information are inserted to one part of the video signal as they are and recorded. Thus, the editing efficiency is improved.

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to a magnetic recording and reproducing bag equipped with a time code generating means for generating a time code during recording and recording it on a magnetic recording medium. It is.

[Prior Art] Magnetic recording and reproducing devices such as video tape recorders (VTRs) used for broadcasting stations and -M offices require precise editing on a frame-by-frame basis. For this reason, a time code as an absolute address is recorded on a magnetic recording medium such as a magnetic tape by a built-in or external generator for each frame.

This time code includes LTC (Linear Track Time (:o
dc) and V ITC (vertical
blankingInterbal Time Cod
e) There is. Generally, LTC and VITC have the same content or are recorded at the same time when time code is recorded.

FIG. 6 shows a bit configuration diagram of VITC, seconds.

Four bits are assigned to each of the 1's digit and the 10's digit of the minute. Further, two synchronization bits are allocated immediately before the 1 minute 2 o'clock area, and a binary group of user's bits (UB) of four bits is provided immediately before the synchronization bits. This UB is an area that can be freely set by the user.
Used to confirm tape numbers, etc.

[Problems to be Solved by the Invention] In the conventional magnetic recording and reproducing apparatus as described above, when recording video and audio signals from other magnetic tapes onto a magnetic tape on which only a time code has been previously recorded by online editing, etc. Alternatively, when performing insert recording of only video signals, the contents of LTC and VITC are different, and VTIC cannot be used in editing data processing, making it impossible to read low-speed tape running.

In order to solve this problem, a method has been proposed in which, instead of reading the LTC during recording, the contents of the VrTC are converted to have the same contents as the LTC and then recorded. However, this method has the disadvantage that the UB contained in the original VITC is erased, making it impossible to understand arbitrary information regarding the image.

The present invention was made in order to solve such problems, and an object of the present invention is to provide a magnetic recording and reproducing device that makes the LTC and VITC the same content during dubbing and inserting, and prevents the user's bit information from being erased. shall be.

[Means for Solving the Problems] In order to achieve the above object, the present invention combines a video signal on the source side with an insertion target frame and separates the time code of the master example, and also separates the time code of the master example. This system is provided with a processing means for storing user's bit information, and a recording means for combining the time code and user's bit information produced by the processing means with a frame on the source side and recording it at the same 9-frame position on the master side.

[Function] By configuring as described above, when inserting a video signal, the time code signal data includes hours 2 minutes 1 second,
The frame information is converted to match the position on the linear track to be inserted, and the user's bit information is inserted and recorded as part of the video signal as it was.

Therefore, V
Since the user's bit information remains intact even after ITC conversion, the user's bit information can be used on the master tape or source tape even after insertion.

[Embodiment] FIG. 1 is a diagram showing an embodiment of the magnetic recording/reproducing apparatus according to the present invention, and FIG. 2 is an explanatory diagram showing the formation of a recording pattern on a magnetic tape according to the present invention. .

In FIG. 2, 1 is an LTC track, 2 is a video signal track, and 3 is a VITC recording section.

LTC consists of 80 bits per frame.

A minute and a second, frame information and a user freely configurable portion (UB) are allocated and recorded on LTC track 1 by a fixed head. Further, VITC is composed of 90 bits, and is encoded and inserted into the vertical blanking period of the video signal.

This VITC is recorded repeatedly four times in one frame.

Next, in the t51 diagram, 4 is the VITC generator, 5
is a TC setting unit that sets time code data; 6 is a CPU that controls the device; 7 is a synchronization signal separation circuit that separates a composite synchronization signal from a video signal; and 8 is a vertical separation circuit that separates a vertical synchronization signal from a video signal. The circuit 9 is a synthesis circuit that counts the wood synchronization signal based on the vertical synchronization signal and outputs the VITC signal at the specified horizontal signal, and IO is a separation circuit that separates the VITC from the video signal.

11 is an LTC generator that generates LTC based on the time code output from the CPU 6 and applies it to the fixed head 20; 12 is an LTC reader that reads the LTC signal from the fixed head 20; 13 is a display unit that displays LTC and VITC; 14; 16 is a switch connected between the switch 15 and the combining circuit 9, and 17 and 18 are selected by the switch 15 and the switch l6. 20 is a fixed head for recording or reproducing LTC on a magnetic tape.

In the above configuration, normal LTC and VITC recording operations will be explained.

Time code data is set by the TC setting section 5, and this data is input to the VITC generator 4 via the CPU 6. VITC generator 4 generates VITC based on time code data. On the other hand, a composite synchronization signal and a vertical synchronization signal are separated from the video signal by a synchronization signal separation circuit 7 and a vertical separation circuit 8. and,
Horizontal signals are counted based on the vertical synchronizing signal, and VITC is output at a specified point as shown in FIG. This VIT
C is input to the synthesis circuit 9, output from the 1-separation circuit 1O, and inserted into the video signal (signal from which the VITC portion is deleted from the input video signal) provided via the memory 17 or memory 18. , recorded on magnetic tape along with the video signal.

On the other hand, time code data is set by the TC setting section 5, and the CPU 6 outputs this to the LTC generator 11 at a predetermined timing. LTC generator 11 is V
EVEN FRA output from ITC generator 4
LTC is generated based on the ME signal and output to the fixed head 20. With this fixed head 20, LTC
or recorded on linear tracks of magnetic tape.

Next, VITC recording accompanying editing processing will be explained with reference to the flowchart of FIG. 3 and the time chart of FIG. 4. Incidentally, FIG. 5 is an explanatory diagram of the frame relationship when the LTC on the master side is inserted into the video signal on the source side and the combined signal is recorded on the master side.

First, in the case of insert recording of only a video signal, the part to be inserted is first determined on the master side VTR, and the editing IN point and OUT point are set. Next, select the image to be embedded on the source VTR and set either its IN point or OUT point. If you start automatic editing in this state (S:11), the two VTs on the source side and master side will
R runs the magnetic tape from the IN point toward the pre-roll point a predetermined time ago (S]2). The VTR that arrived at the pre-roll point first enters the PAUSE state and waits (533), and when both VTRs arrive at the pre-roll point (S34), both VTRs enter the playback state z (s3s).
) (in this poem, the source VTR starts j frames in advance).

Here, the LTC of the master tape read by the fixed head 20 of the master side VTR is transferred to the CP via the LTC reader 12.
The data is read into U6 and further displayed on display unit 13 by CPU6. Also, when the master-side video signal reaches one frame before the IN point (S:15), that data is stored in the memory 14.
(S38). Furthermore, the source side VTR is IN
When the point is reached, the input video signal is separated from the circuit 1o.
The VITC separated by is stored in the memory 14 (S:19). switch 15 and switch 1 at the same time
6 is switched to select memory 17, the video signal is stored in memory 17, and the signal from which the VTTC portion has been deleted is input to synthesis circuit 9. Since the video signal is output after storing l frames in memory, the signal is delayed by one frame. Next, one frame's worth is output by selecting the switch 15 and switch 16 or the memory 18.

Thereafter, memory 17 and memory 18 are used alternately for each frame.

Next, data is created by combining the video signal for one frame with the time code information obtained from the master side (540), and the contents of S40 are combined with the UB data obtained from the memory contents of the source side VrTC (S39). time code data is obtained (S41). Next, the second frame vertical synchronizing signal inputted from the source side via the vertical separation circuit 8 and VITC generator 4 is inputted to the synthesis circuit 9 after the specified horizontal signal, and the source side outputted from the memory 17 is It is combined with the video signal of the first frame (S42) and recorded on the first frame on the master magnetic tape (S43).
).

After repeating the above operations, when the OUT point is reached (S44), the second master side VTR is switched to playback mode (S45).
, the editing mode ends after a certain period of time (S46).

By performing the insert processing as described above,
The time code data in the VITC included in the inserted video signal becomes the same data as the previously recorded LTC, and the UB data is saved as the data recorded on the source magnetic tape.

[Effects of the Invention] As explained above, the present invention provides processing means for combining a video signal on the source side with a frame to be inserted, separating the time code on the master side, and saving user's bit information on the master side. and a recording means that combines the time code and user's bit information from the means with the frame on the source side and records it at the same frame position on the master side, so even if insert processing is performed, the user's bit data will not be lost. The arbitrary information for the insert image can be effectively used even after processing, and the efficiency of editing work can be improved.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of the magnetic recording/reproducing apparatus according to the present invention, FIG. 2 is an explanatory diagram showing the formation of a recording pattern on a magnetic tape according to the present invention, and FIG. 3 shows the processing of the present invention. Flowchart, FIG. 4 is a time chart showing the processing of the present invention, and FIG. 5 is a frame according to the present invention when a signal obtained by inserting and combining the LTC signal of the master side into the video signal of the source side is recorded on the master side. An explanatory diagram of the relationship, FIG. 6 is a bit configuration diagram of VITC. In the figure. 4: VITC generator 5: TC setting section 6: CPU 7: Synchronous signal separation circuit 8: Vertical separation circuit 9: Synthesis circuit 10: Separation circuit 11/LTC generator 14.17.18 + memory 15,] 6: Switch 20, Fixed head agent Patent attorney 1) Haru Kitatake■ ;Language scale

Claims (1)

[Claims] In a magnetic recording and reproducing device that records each frame using a time code as an absolute address and also provides a user's bit area during the recording, the video signal on the source side is synthesized with the frame to be inserted. A processing means for separating the time code on the master side and storing user's bit information on the master side, and combining the time code and user's bit information by the means with the frame on the source side and recording it at the same frame position on the master side. What is claimed is: 1. A magnetic recording and reproducing apparatus comprising: a recording means for recording.