JP2586510B2 - Recording / playback apparatus having a lookup mechanism - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention provides a recording / reproducing apparatus capable of extremely easily confirming the content of image information recorded on a recording medium.

2. Description of the Related Art A conventional video tape recorder (hereinafter abbreviated as VTR) will be described as an example of a conventional technology. A user of a VTR may record several types of television programs on a single recording tape. This often occurs, but when the user wants to check the contents of a recorded tape or to play back from a target recording start position, that is, to perform cueing, a tape counter or a high-speed playback mechanism of a VTR has been used exclusively.

Problems to be Solved by the Invention However, even if any of the above methods is adopted, not only is it troublesome to check the recorded contents, but also it is very troublesome to perform reproduction and re-recording from the target position.

Means for Solving the Problems In order to solve the above-described problem, in a recording and reproducing apparatus having a lookup mechanism of the present invention, a specific portion on a recording medium provided with an image signal recording unit and a control signal recording unit is provided. Table initialization means for securing a look-up table section of a predetermined length and recording an identification signal indicating the presence of the look-up table in the control signal recording section, corresponding to a recording start position when recording of image information is started Index recording means for recording an individual index at a control signal recording position to be recorded, and an image signal for one frame recorded in an image signal recording section of the look-up table section in conjunction with the recording of the image information, and a corresponding control signal Table creation means for recording a control signal in a recording unit; A table reproducing means for reproducing one frame of image information recorded in the uptable section is provided.

According to the present invention, with the above-described configuration, the content of image information recorded on a recording medium can be checked very easily, and reproduction or re-recording can be easily performed from a target recording start position. .

Embodiments Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram showing a look-up mechanism of a VTR according to an embodiment of the present invention. A video signal taken out by a TV tuner 1 is transmitted through a video signal recording circuit 2 and a recording / reproducing head changeover switch 3 to a video signal. It is sent to the head 4 and recorded on the video track of the magnetic tape shown in FIG. 2 by the video head 4. An image memory 5 is connected to the video signal recording circuit 2 to record one frame of image information at the start of recording.

On the other hand, a recording control signal generated from a vertical synchronization signal extraction circuit (not shown) is supplied to a 4-bit recording shift register 6 as a clock signal, and the output of the final stage of the recording shift register is supplied to a control signal modulation circuit. The control signal is sent to the control head 9 via the control signal recording amplifier 8 and the control head 9 and is recorded on the control track of the magnetic tape shown in FIG. The recording shift register 6
Is connected to an index generating circuit 10 for generating 4-bit data for generating an index. A reproduction control signal reproduced by the control head 9 is supplied as a clock signal to a 4-bit reproduction shift register 13 via a control signal reproduction amplifier 11 and a control signal demodulation circuit 12, and is transmitted from the recording shift register 13. The 4-bit read data is supplied to a table creation controller 14, a look-up controller 15, and a cueing controller 16.

Further, a command signal from the table creation controller 14 is supplied to the video signal recording circuit 2 and a rewind reel drive circuit 17, and an output of the rewind reel drive circuit 17 is supplied to a rewind-side reel motor 18, The output of the video signal reproducing circuit 19 for reproducing a signal obtained through the video head 4 and the pre-recording / reproducing head changeover switch 3 is sent to the RF converter 20 and the look-up controller
The command signal from 15 is the video signal reproduction circuit 19, the rewind reel drive circuit 17, and the take-up reel drive circuit.
The output of the take-up reel drive circuit 21 is supplied to a take-up reel motor 22.

Note that the recording shift register 6 and the control signal recording amplifier 8 are connected so as to be in an operating state when the recording start signal shifts to the active state, and the reproducing shift register 13 is in an operating state at other times.

In the apparatus shown in FIG. 1, the recording shift register 6, the control signal demodulation circuit 7, the control signal recording amplifier 8, and the index generating circuit 10 record an individual index at a recording start position on a recording medium when recording an image. A stamper 100 is configured, and includes a TV tuner 1, a video signal recording circuit 2, an image memory 5, a control signal reproduction amplifier 11, a control signal demodulation circuit 12, a reproduction shift register 13, a table creation controller 14, and a rewind reel driving circuit 17. A table creation block 200 configured to record at least one frame of image information at a predetermined portion on the recording medium and corresponding to the individual index to form a look-up table is configured, and a video signal reproduction circuit 19 and Lookup controller
A table playback block 300 for playing back the image of the look-up table unit as required by 15 and the RF converter 20 is configured, and a cueing controller 16 and a take-up reel drive circuit 21 allow the user to operate the look-up table unit. When one of the images is selected, a cueing block 400 for starting reproduction or recording from the corresponding recording start position is configured.

The operation of the recording / reproducing apparatus having the lookup mechanism configured as described above will be described.

In the following description, it is assumed that the value of the control pulse has one of 0 and 1, but this is achieved by switching the duty of the recording control pulse into two by the control signal modulation circuit 7 in FIG. During playback, the control signal demodulation circuit 12
By determining the duty, the value of the control pulse can be read. The recording shift register 6 operates the control signal modulation circuit so that four continuous control pulse trains having a value corresponding to the 4-bit data sent from the index generation circuit 10 are generated. The shift register 13 outputs 4-bit data corresponding to four consecutive control pulse trains.

First, FIG. 2 is a simplified diagram showing the arrangement and recording patterns of video and audio tracks and control tracks on a magnetic tape, and FIG. 3 is a video head 4 and a control head 9 for a magnetic tape.
Take-up reel 22 'and rewind reel 18'
FIG. 4 is a simplified diagram showing a planar positional relationship of FIG.
It is a flowchart which shows the operation of the apparatus of the figure.

Now, the recording operation will be described mainly with reference to FIGS. 1 and 4. When the recording start signal shown in FIG. 1 shifts to the active state and the flow shown in FIG. (In a general VTR, a control pulse is recorded every 33 msec.
within c. In step (1), it is determined whether the tape is an unused tape or a recorded tape based on whether or not a control pulse is detected. More specifically, in order to identify the start position of the look-up table in a subsequent operation, a control pulse is continuously output eight times as shown by a cross on the control track of the look-up table section in FIG. Is set to 1, and after a certain table space is secured, the process proceeds to the next process. In the process 52, the video signal recording circuit 2 and the video head 4 start recording on the video track shown in FIG. 3 and transfer one frame of image information to the image memory 5 (however, if a commercial portion is transferred). Since it is not possible to check the recorded contents later, it is necessary to wait if necessary.) At the same time, the index is written on the control track by the stamper 100. Here, as an example of a specific format, for the purpose of identifying the index portion, first, the control pulse value is successively set to four places 1 and combinations of values of the four control pulses following [0001] to [11]
10] represents the number of the recording start position.

The branch 53 waits until the recording ends (due to the end of the program or the operation of the timer), and in the process 54, the control pulse value is continuously set to four places 1 to indicate the recording end position, and further to four places 0. I do. In the processing 55 and the branch 56, the table creation controller 14 continuously sends the rewind reel drive circuit 17 a high-speed rewind command signal until the value of the eight control pulses becomes 1, thereby starting the look-up table. In step 57, rewinding is stopped and the tape is run in the forward direction to check the start position of the look-up table again, and the number of control pulses is counted from that position to determine a predetermined position on the look-up table. That is, a position corresponding to the individual index recorded at the start of recording is searched, and in process 58, one frame of image information already stored in the image memory 5 is recorded, and a series of operations is completed.

On the other hand, when it is determined that the tape is a recorded tape in the branch 50, the cue block 400 is operated in the processing 59 and the branch 60 to record the target index recording position or the last recording end position (continuous 4 Control pulse values are [1111], followed by [00
00] is the last recording end position. ) Is performed, and in the process 61, after performing the synchronization with the already recorded control signal, the process 52 and the subsequent processes may be executed.

After recording the image information in the look-up table, whether to rewind to the beginning of the tape and prepare for the next recording or playback, or to return to the current recording start position or return to the recording end position, depends on the designation of the user. Good.

When playing back a recorded tape, the table playback block 300 shown in FIG. 1 is operated to divide the television screen into an appropriate number and display one frame image in the lookup table together with index information. In this state, the system waits until the user selects an index or performs another operation. If a specific index is selected, high-speed cueing may be performed in the same procedure as that for cueing a recorded tape shown in FIG. 4, and reproduction may be started from a target position. Of course, since a series of operations after the selection of the index can be automatically executed, it is not necessary for the user to continuously operate the apparatus at the time of cueing as in the past.

By the way, in this embodiment, the method of recording one frame of image information in the look-up table at the time of completion of recording is employed. Can be stored in a separate image memory, the look-up table can be written at the start of recording. Further, the position where the lookup table is provided is not limited to the beginning of the tape, but may be the end, for example.

Further, in the embodiment, the example of the VTR using the magnetic tape as the recording medium has been described, but it is needless to say that the present invention can be applied to any image reproducing apparatus that benefits from the present invention.
In FIG. 1, the recording shift register 6, the control signal modulation circuit 7, the index generation circuit 10, the control signal sub-length circuit 12, the reproduction shift register 13, the table creation controller 14, the look-up controller 15, the cueing controller 16, etc. , Are represented by individual blocks for the sake of convenience, but all of them can be configured using a part of the functions of the microprocessor.

As is apparent from the above description, the recording / reproducing apparatus having the lookup mechanism of the present invention has a predetermined length on a specific portion on a recording medium provided with an image signal recording section and a control signal recording section. Table initialization means for securing a look-up table section and recording an identification signal indicating the presence of a look-up table in the control signal recording section (in the embodiment shown in FIG. 1, the stamper 100 initializes the table shown in FIG. 4). Conversion processing 51 is performed.)
Index recording means for recording an individual index at a control signal recording position corresponding to the recording start position when recording of image information is started (in the embodiment shown in FIG. 1, the stamper 100 also serves as the index recording means). Table creation means for recording an image signal of one frame in the image signal recording section of the look-up table section in conjunction with the recording of the image information and recording the control signal in the corresponding control signal recording section. 20
0, and a table reproducing means 300 for reproducing one frame of image information recorded in the look-up table section at the time of image reproduction, wherein the contents of the image information recorded on the recording medium are provided. Not only can be checked very easily, but also, when a user selects any of the images in the look-up table section, a cueing means 400 for starting reproduction or recording from a corresponding recording start position is added. This makes it possible to automatically locate the target recording start position without any difficulty, which is a great effect.

[Brief description of the drawings]

FIG. 1 is a block diagram of a recording / reproducing apparatus having a look-up mechanism according to an embodiment of the present invention, and FIG. 2 is a simplified diagram showing the arrangement and recording patterns of video and audio tracks and control tracks on a magnetic tape. FIG. 3 is a simplified diagram showing a planar positional relationship between a video head and a control head and a take-up reel and a rewind side reel with respect to a magnetic tape, and FIG. 4 is a diagram showing the operation of the apparatus shown in FIG. It is a flowchart which shows. 100 …… Stamper, 200 …… Table making block, 30
0 ... Table playback block, 400 ... Cue block.

Claims (2)

(57) [Claims] An image signal recording section and a control signal recording section are provided with a predetermined length of a look-up table section in a specific portion on a recording medium provided with the control signal recording section. Table initialization means for recording an identification signal shown, index recording means for recording an individual index at a control signal recording position corresponding to a recording start position when recording of image information is started, and interlocking with recording of the image information Table creation means for recording an image signal for one frame in the image signal recording section of the look-up table section and recording a control signal in the corresponding control signal recording section, and recording the control signal in the lookup table section during image reproduction. Look-ahead equipped with a table reproducing means for reproducing one frame of image information Recording and reproducing apparatus having a flop mechanism. 2. A lookup table section having a predetermined length is secured in a specific portion on a recording medium provided with an image signal recording section and a control signal recording section, and the presence of the lookup table in the control signal recording section. Table initialization means for recording an identification signal shown, index recording means for recording an individual index at a control signal recording position corresponding to a recording start position when recording of image information is started, and interlocking with recording of the image information Table creation means for recording an image signal for one frame in the image signal recording section of the look-up table section and recording a control signal in the corresponding control signal recording section, and recording the control signal in the lookup table section during image reproduction. A table reproducing means for reproducing one frame of image information; When selecting one of the click-up table portion of the image, recording and reproducing apparatus having a look-up mechanism provided with the cueing means allowed to start playing or recording from the corresponding recording start position.