JP2756796B2 - Video signal and time code recording method - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary head type recording apparatus for recording a time code together with a video signal on a tape-like recording medium.

[Related Art] Hereinafter, in this specification, a video tape recorder (VTR) will be described as an example of this type of device.

FIG. 5 is a diagram showing a recording track pattern on a magnetic tape by a conventional VTR. Conventionally, as shown in FIG. 5, a time code used for editing a tape is recorded in a time code area 11 on each information area 2 recorded on a magnetic tape 1.

[Problems to be Solved by the Invention] In the conventional VTR as described above, since only one type of time code is recorded, it is inconvenient in various points.
In particular, when the above-mentioned VTR is used as a VTR for editing, there are the following problems.

In other words, on the magnetic tape provisionally edited with the editing VTR,
Since only one of the time code originally recorded on the recording-side magnetic tape and the time code reproduced from the reproducing-side magnetic tape is recorded, there are the following disadvantages.

When only the time code on the recording magnetic tape side is recorded, the cut inserted by editing (video information)
Since there is no time code, it is necessary to register the time code information of the cut of the magnetic tape on the reproduction side required for the main editing by another device.

When the time code of the magnetic tape on the reproduction side is recorded, the inserted video information is recorded in a portion where the video information different from that of the magnetic tape for reproduction has been inserted by editing once. The time code of the magnetic tape on the reproducing side in the portion indicated by the arrow is recorded. Therefore, if the part inserted by editing is edited again, there is no time code originally recorded, so that the part inserted by editing has the absolute position from the beginning of recording on the recording magnetic tape. Hard to find.

Therefore, it is conceivable to record a plurality of types of time codes. In this case, however, the time code area 11 shown in FIG. 5 must be large, which hinders high-density recording of video signals.

The present invention has been made to solve such a conventional problem, and an object of the present invention is to provide a rotary head type recording apparatus capable of recording a plurality of types of time codes without hindering high-density recording.

[Means for Solving the Problems] In order to achieve the above-mentioned object, a video signal and time code recording method according to the present invention provides a method for recording a video signal on each track on a tape-shaped recording medium. In order to record a video area and a time code, a time code area provided separately from the video area is provided, and a video signal and a time code are sequentially recorded on the medium by a rotating head. A first time code indicating predetermined time information is recorded in the time code area of at least one of the plurality of adjacent tracks. The time code area of at least one other track of the plurality of tracks A second time code indicating time information different from the imcode is recorded.

[Operation] With the configuration described above, a plurality of types of time codes can be recorded with sufficient accuracy without separately providing a time code area for each track.

Embodiment FIG. 1 is a diagram showing a recording track pattern of a magnetic tape recorded by a VTR according to an embodiment of the present invention. In FIG. 1, reference numeral 1 denotes a magnetic tape for recording and holding an information signal; Reference numeral 2 denotes an information area in which an information signal such as a video signal is recorded in a recording track recorded on the magnetic tape 1. Reference numeral 3 denotes a first area for recording a first time code on every other recording track. Similarly, a time code area 4 is a second time code area for recording a second time code on every other recording track.

FIG. 2 is a block diagram showing a schematic configuration of a VTR as an embodiment of the present invention for recording a recording pattern as shown in FIG. 1. In FIG. 2, reference numeral 5 denotes a clock of a predetermined frequency according to a reference clock. Generated clock generator, 6a, 6b
Is a parallelizing circuit for converting the time code data in parallel, 7 is an adder for adding +1 to the time code data, 8 is the time code data from the parallelizing circuit 6a as preset data, and after starting the editing, the clock is changed. A time code counter for counting, 9a is a serialization circuit for converting parallel data from the time code counter 8 into serial data, 10 is a time code buffer for receiving and holding the time code from the parallelization circuit 6b, 9b Is a serializing circuit for converting parallel data input from the time code buffer 10 into serial data.

FIG. 3 is a diagram showing the bit configuration of the time code by the VTR according to the present embodiment, and each bit is assigned to each of the first digit and the tenth digit of the frame number, second, minute, and hour.

The recording track number in the drawing is data indicating the number of the track on which the video signal of one frame is recorded. Further, the CRC code is a well-known CRCC.

FIG. 4 is a flowchart showing the operation of the system controller shown in FIG.

Hereinafter, the operation of this embodiment will be described with reference to FIGS.

First, the operation during normal recording will be described. The video signal input from the input terminal 20 is converted into a signal form suitable for recording by the video signal recording processing circuit 21, and then input to the switch SW2 via the switch SW1 connected to the R side during recording. HA and HB are rotating heads that rotate with a phase difference of 180 ° from each other and have different azimuth angles, and 22 is inverted each time the rotating drum on which these rotating heads HA and HB are fixed rotates by 180 °. Square wave (hereinafter PG
(Hereinafter referred to as "rotation detector").

The switch SW2 is connected to the A side when the rotary head HA traces the information area 2 and to the B side when the rotary head HB traces the information area 2 according to the PG. When the switch SW2 is connected to the A side, the switches SW4 and SW5 are also connected to the A side, and when the switch SW2 is connected to the B side, the switches SW4 and SW5 are also connected to the B side.

As a result, the video signals from the video signal recording processing circuit 21 are alternately recorded on the information area 2 on the tape 1 by the rotary heads HA and HB.

In this embodiment, a video signal of one field is recorded on four tracks.

On the other hand, the time code counter 8 counts the clock from the clock generator 5 and outputs parallel time code data to the serialization circuit 9a. The time code counter 8 counts according to a count enable signal A from the system controller 23 during recording. The time code counter 8 is preset by a preset signal B from the system controller 23 immediately before the start of recording. In the serializing circuit 9a, the time code counter 8
Is converted to serial data, and the rotary head HA
It is output at the timing of tracing the first time code area 3 in the figure. The switch SW3 is connected to the R side during recording, and the switch SW4 is connected to the B side while the rotary head HA traces the time code area 3.
This time code is recorded on the time code area 3 by the rotary head HA.

When the recording is completed, the system controller 23 controls the capstan control circuit 24 to convey the tape 1 by a predetermined distance in a direction opposite to the recording direction. At the start of recording, switch SW3
Is connected to the P side for a predetermined period, and the time code reproduced from the time code area 3 by the rotary head HA at this time is supplied to the paralleling circuit 6a. The time code parallelized by the parallelization circuit 6a is added with 1 by an adder 7 to be preset data of a time code counter 8. When actually recording the video signal, the time code counter 8 is preset to the time code output from the adder 7 by the preset signal B, and the switches SW1 and SW
3 is connected to the R side, and recording is performed as described above.

Next, the operation at the time of reproduction will be described. Switch SW2,
SW4 and SW5 are switched by PG in the same way as during recording, and the rotating head H
The video signals reproduced by A and HB are output from the switch SW2. The switch SW1 is connected to the P side during playback,
The reproduced video signal is output from a terminal 29 after being converted into an original signal form by a video signal reproduction processing circuit 28.

On the other hand, the switch SW3 is connected to the P side, and the above-described time code reproduced from the rotary head HA is supplied to the system controller 23 and used for system control during reproduction. For example, when searching for a portion where a predetermined time code (target value) is recorded, the tape 1 is run at high speed by the capstan control circuit 24, and after the time code reproduced from the rotary head HA approaches the target value, After running at low speed and further matching the target value, the mode is switched to the stop mode or the normal reproduction mode.

The time code reproduced from the time code area 3 can also be output from the system controller 23 to the output terminal 27, and can be used for controlling another device.

Next, the second time code will be described. The second time code is serially output from the serialization circuit 9b,
The data is recorded in the second time code area 4 by the rotary head HB via the R side of the switch SW6.

During reproduction, the second time code reproduced from the time code area 4 is supplied to the system controller 23 via the P-type switch SW6, and the second time code can be used for system control such as search. It is. In this case, since the first time code and the second time code are recorded by different azimuth heads, at the time of reproduction, the time code reproduced from the rotary head HA is always the first time code. The time code reproduced from the rotary head HB can always be determined to be the second time code. Therefore, a search using any of the time codes can be easily performed.

In the present embodiment, an externally input time code can be used as the second time code.
That is, the time code input from the terminal 26 is supplied to the parallelization circuit 6b via the gate 25, and the time code output from the parallelization circuit 6b is supplied to the serialization circuit 9b via the time code buffer 10, It is recorded on the time code area 4 as described above.

Next, the operation when editing is performed using the VTR of the above-described embodiment on the recording side will be described with reference to the flowchart of FIG. When an edit mode is designated by an operation unit (not shown) (S1), and a time code corresponding to an edit start point and an edit end point is designated (S2), a standby state for editing start is established.

Next, the tape is pre-rolled (S4) according to the editing start command (S3). That is, the tape is rewound to just before the editing start point. After the VTR according to the present embodiment and the VTR performing reproduction complete the pre-roll, the VTR according to the present embodiment shifts to the reproduction mode (S5). Then, the first time code area from the pre-roll point to the editing start point is reproduced, the time code data is input to the parallelization circuit 6a, and the serial time code data is converted into parallel time code data. The time code data input to the parallelization circuit 6a is added to the adder 7
, And is input to the time code counter 8 as preset data (S6). Then, the reproduction mode is stopped (S7). After the start of the subsequent editing, the time code counter 8 counts the clock from the clock generator 5 as described above and converts the parallel time code data into a serialization circuit 9a. The serialization circuit 9a converts the parallel time code data into serial time code data and outputs it as time code data on the recording magnetic tape side.

Next, the gate 25 is turned on, and the time code data from the reproduction side VTR is converted into parallel time code data by the parallelization circuit 6b and input to the time code buffer 10 (S8). In this time code buffer 10, time code data is output to the serial circuit 9b by the clock from the clock generator 5, and the parallel time code data is converted into serial time code data by the serialization circuit 9b.
The time code data of the tape being reproduced is output as a second time code.

After the start of editing (S9), the first and second time code data output in this way are separated by separate rotary heads HA and HB, and the first and second time code data of the recording tracks of the magnetic tape 1 are respectively recorded. Recorded in areas 3 and 4. When the execution of the edit mode is completed (S10), the VTR stops (S11).

As a result, even when the video signal recorded on the reproducing magnetic tape is edited on the recording magnetic tape, a continuous time code remains from the beginning of the magnetic tape. Therefore, even if a different video signal is edited again in the once edited portion, the positions of the editing start and end points (absolute positions) can be easily known from the beginning on the magnetic tape side. In addition, since the time code recorded on the magnetic tape on the playback side is always recorded, even during online editing, playback (source)
You can get the time code of the editing start and end points on the side.

In the VTR of the embodiment as described above, the time code recording area is not widened at all compared to the conventional VTR.
Time codes of various types can be recorded, and these can be reliably extracted during reproduction.

[Effects of the Invention] As described above, according to the rotary head type recording apparatus of the present invention, a plurality of types of time codes can be recorded without hindering high-density recording. The time code can be used for the purpose.

[Brief description of the drawings]

FIG. 1 is a diagram showing a recording track pattern on a tape by a VTR according to an embodiment of the present invention, FIG. 2 is a block diagram showing a schematic configuration of a VTR as an embodiment of the present invention, and FIG. The figure showing the bit configuration of the time code by the VTR in the figure,
FIG. 4 is a flowchart showing the operation of the system controller of FIG. 2, and FIG. 5 is a diagram showing a conventional recording track pattern on a tape. In the figure. 1: Magnetic tape, 2: Information area 3: First time code area 4: Second time code area 5: Clock generator 6a, 6b: Parallel circuit, 7: Adder 8: Time code counter 9a, 9b : Serialization circuit 10: Time code bit buffer 11: Time code area

Claims (5)

(57) [Claims] 1. A video area for recording a video signal on each track on a tape-shaped recording medium and a time code area provided separately from the video area for recording a time code, and are sequentially provided on the medium. A method of recording a video signal and a time code by a rotating head, comprising recording a video signal of the same field over video areas of a plurality of adjacent tracks, and recording at least one of the plurality of adjacent tracks. A first time code indicating predetermined time information is recorded in the time code area, and the first time code is stored in the time code area of at least one other track of the plurality of adjacent tracks. Video signal and time recording a second time code indicating different time information Method of recording over de. 2. Each of the adjacent tracks has one
2. The method according to claim 1, further comprising the step of recording data indicating which track of the track on which the video signal of the frame is recorded. 3. The method according to claim 1, wherein the first time code and the second time code are recorded on the adjacent tracks a plurality of times, respectively. The recording method of the video signal and the time code described in the above section. 4. The first time code according to claim 1, wherein the first time code is a time code continuous from the beginning on the tape-shaped recording medium.
A method for recording a video signal and a time code according to any one of the above items. 5. The method according to claim 1, wherein a redundant code for detecting an error of the first or second time code is recorded in the time code area. A video signal and a time code recording method according to any one of the above.