JPH04335239A - Video tape recorder - Google Patents

Abstract

PURPOSE:To perform recording or reproducing in skipping a part which has never been reproduced by automatically discriminating a part which has been reproduced or a part which has never been reproduced. CONSTITUTION:A discriminating signal for discriminating the part which has reproduced in a tape 9 is generated and recorded at the time of reproducing the tape by discriminating signal recording means 2-14. The discriminating signal recorded on the tape by the discriminating signal recording means is reproduced by discriminating signal reproducing means 4-6 at the time of reproducing this tape. During the time of reproducing the discriminating signal from the tape by the discriminating signal reproducing means, the device is set as a reproducing mode, and recorded information is reproduced from the tape by a system controller 1 as a reproducing control means. Then, the discriminating signal recorded on the tape by the discriminating signal recording means is reproduced at the time of recording this tape by the discriminating signal reproducing means, and during the time of reproducing the discriminating signal from the tape by the discriminating signal reproducing means, the device is set as the recording mode, and the information is recorded on the above tape by the system controller 1 as the recording control means.

Description

[Detailed description of the invention]

[Purpose of the invention]

0001

[Industrial Application Field] The present invention relates to a video tape recorder (
The present invention relates to a VTR (VTR), and particularly to mode switching control during tape playback.

0002

2. Description of the Related Art When playing back and viewing a recorded tape on a conventional VTR, if there is a portion that has been recorded but does not need to be viewed, the device is put into fast forward mode by operating a key. After that, when the user comes to the part he or she needs to view, he or she must again operate the keys to put the device into playback mode. Furthermore, when watching the tape over and over again, the user must perform the above operations each time, placing a large burden on the user.

[0003] Furthermore, in the conventional VTR mentioned above, when new information is to be recorded on an already recorded tape, it is necessary to never play back a part of the previously recorded part of the tape that has never been played back. The new information may be recorded without being recorded. However, before recording new information on the tape, it is necessary to find a part that has never been played back, skip this part, and record the new information in another part. However, there is usually no reliable way to distinguish between parts of a recorded tape that have never been played and other parts, so identifying the parts that have never been played can be very time-consuming and difficult to implement. It was impossible to do such a thing.

0004

[Problem to be Solved by the Invention] When repeatedly playing back and viewing a recorded tape, if there is a part that does not need to be viewed, the device is set to fast forward mode each time to skip the part that does not need to be viewed. After that, the user has to perform operations such as searching for the part that needs to be viewed again in playback mode, which has the disadvantage of placing a heavy burden on the user.

[0005] Furthermore, when recording new information on an already recorded tape, it takes a great deal of time to perform operations such as excluding parts that have never been played back and recording the new information in other parts. Because of this, there is also a drawback that recorded information in a portion that has never been reproduced is erased and the new information is recorded.

The present invention aims to eliminate the above-mentioned drawbacks by automatically distinguishing between parts of a recorded tape that have been played back at least once and parts that have never been played back.
It is an object of the present invention to provide a video tape recorder capable of recording or reproducing by skipping the part that has never been reproduced. [Structure of the invention]

[0007]

[Means for Solving the Problems] The present invention provides a video tape recorder including an identification signal recording means for generating an identification signal for identifying a reproduced portion of a tape and recording it when the tape is reproduced; an identification signal reproducing means for reproducing the identification signal recorded on the tape by the recording means when reproducing the tape; The apparatus includes a reproduction control means for reproducing recorded information from the tape.

[0008] As another configuration, the video tape recorder includes an identification signal recording means for generating an identification signal for identifying a reproduced portion of the tape and recording it when the tape is reproduced; identification signal reproducing means for reproducing the identification signal recorded on the tape during recording of the tape; and during a period when the identification signal is being reproduced from the tape by the identification signal reproducing means, the apparatus is placed in a recording mode and information is transferred to the tape. It has a configuration including a recording control means for recording.

[0009]

In the video tape recorder of the present invention, the identification signal recording means generates an identification signal for identifying the portion of the tape that has been played back, and records this signal when the tape is played back. The identification signal reproducing means reproduces the identification signal recorded on the tape by the identification signal recording means at the time of reproducing the tape. The reproduction control means sets the apparatus in a reproduction mode and reproduces recorded information from the tape during a period when the identification signal is reproduced from the tape by the identification signal reproduction means.

As another feature of the structure, the identification signal recording means generates an identification signal for identifying a portion of the tape that has been played back, and records this when the tape is played back. The identification signal reproducing means reproduces the identification signal recorded on the tape by the identification signal recording means when the tape is recorded. The recording control means puts the apparatus in a recording mode and records information on the tape while the identification signal is being reproduced from the tape by the identification signal reproduction means.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing an embodiment of the video tape recorder of the present invention. Reference numeral 1 indicates a system controller that controls the entire device and also distinguishes between parts of a recorded tape that have been played back even once and parts that have never been played back. Reference numeral 2 indicates a control head 4 that controls the tape. 3 is a control pulse control circuit that controls the control pulses to the set duty ratio; 4 is a control pulse control circuit that controls the control pulses to a control head (not shown) of the tape; A control head for recording and reproducing, 5 an amplifier circuit for amplifying the control pulses reproduced by the control head 4, 6 a duty ratio detection section for detecting the duty ratio of the reproduction control pulses, and 7 a capstan motor and reel for running the tape. A motor drive circuit drives a motor of a tape running system such as a motor, 8 is the above-mentioned motor of the tape running system, and 9 is a tape.

Here, the duty ratio setting section 2, control pulse control circuit 3, and control head 4 serve as identification signal recording means, the control head 4, amplifier circuit 5, and duty ratio detection section 6 serve as identification signal reproducing means, and the system controller Reference numeral 1 constitutes a reproduction control means and a recording control means.

Next, the operation of this embodiment will be explained. During recording, the system controller 1 controls the motor drive circuit 7.
The motor 8 of the tape running system is rotated at a constant speed to run the tape 9 at a constant speed, and video information and the like are recorded by a signal recording system and a video head (not shown). At this time, the system controller 1 activates the duty ratio setting section 2 and causes the control pulse control circuit 3 to set the duty ratio a1 /b1. The control pulse control circuit 3 controls the control pulse to a duty ratio as shown in FIG. 2, and records the control pulse on a control track (not shown) of the tape 9 via the control head 4.

Next, when playing back the tape 9, the system controller 1 controls the motor drive circuit 7 to rotate the tape drive motor 8 at a constant speed to play the tape 9.
While running at a constant speed, a playback head (not shown) plays back video signals recorded on the tape 9, and control is performed to process the signals in the playback signal system. At this time, if a regeneration unnecessary part identification control command is input to the system controller 1 from an operation panel section (not shown), the system controller 1 starts the duty ratio setting section 2 and controls the duty ratio a2 /b2 by control pulse control. Set it to circuit 3. The control pulse control circuit 3 controls the control pulse to a duty ratio as shown in FIG. 3, and records the control pulse on a control track (not shown) of the tape 9 via the control head 4. Therefore, in this case, the duty ratio of the control pulse recorded during recording on the tape 9 is replaced during reproduction.

When the system controller 1 enters a fast forward mode or the like while replacing the duty ratio of the control pulse during playback of the tape 9, the system controller 1 temporarily stops the duty ratio replacement operation, and when the apparatus returns to the playback mode. , restarts the duty ratio replacement operation. As a result, if, for example, the user fast-forwards a part of tape 9 that is not desired to be played back, the duty ratio of the control pulse recorded on the control track of this part will not be replaced, and the duty ratio of the control pulse will not be replaced during recording. It will remain as it is.

As described above, once the duty ratio of the control pulse has been replaced, when a skip playback command for unnecessary parts is issued to the system controller 1 from the operation panel section (not shown), the system controller 1 performs the playback as described below. Take control. That is, when playing tape 9,
The control pulse reproduced by the control head 4 is amplified by the amplifier circuit 5 and then input to the duty ratio detection section 6. The duty ratio detection section 6 detects the duty ratio of the input control pulse and outputs the detection result to the system controller 1.

When the duty ratio changes from a2/b2 to a1/b1, the system controller 1
The motor drive circuit 7 is controlled to put the apparatus in a fast forward mode, and the tape 9 is run in fast forward mode. Further, the system controller 1 changes the duty ratio of the control pulse detected from the duty ratio detection section 6 from a1/b1 to a.
2 /b2, the apparatus is placed in the playback mode again and playback of the tape 9 is resumed.

Next, when recording new information on the tape 9 on which the duty ratio of the control pulse has been replaced as described above, the system controller 1 replaces the duty ratio of the control pulse detected by the duty ratio detector 6. When the duty ratio changes from a2/b2 to a1/b1, the motor drive circuit 7 is controlled to put the apparatus in fast forward mode, and the tape 19 is run in fast forward mode, thereby temporarily stopping recording of the new information. . or,
The system controller 1 has a duty ratio of the control pulse detected from the duty ratio detection section 6 such that the duty ratio is a1/
When b1 changes to a2 /b2, the apparatus is set to recording mode again and the new information is recorded on tape 9. This automatically prevents new information from being recorded on a portion of the tape 9 that has never been played back.

According to this embodiment, when repeatedly playing back the same unnecessary portion of a recorded tape by skipping it, the device automatically skips the same unnecessary portion and plays it back, reducing the burden on the user. This can be significantly reduced to improve the operability of the device.

[0020] Furthermore, when new information is to be recorded on an already recorded tape, the new information can be recorded while automatically skipping the part that has never been played back. It is possible to prevent the recorded information from being deleted in a portion that has not been recorded without placing a burden on the user.

[0021]

[Effects of the Invention] As described above, according to the video tape recorder of the present invention, it is possible to automatically distinguish between parts of a recorded tape that have been played back at least once and parts that have never been played back. You can record or play back by skipping the unrecorded parts.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of a video tape recorder of the present invention.

FIG. 2 is a waveform diagram of control pulses set by the duty ratio setting section shown in FIG. 1;

FIG. 3 is a waveform diagram of control pulses set by the duty ratio setting section shown in FIG. 1;

[Explanation of symbols]

1...System controller 2...Duty ratio setting section 3...Control pulse control circuit 4...Control head 5...Amplification circuit 6...Duty ratio detection section 7...Motor drive circuit 8...Motor

Claims (2)

[Claims] 1. A video tape recorder, comprising: an identification signal recording means for generating an identification signal for identifying a reproduced portion of a tape and recording the same when the tape is played; and a recording means for recording the identification signal on the tape by the identification signal recording means. an identification signal reproducing means for reproducing the identified identification signal when reproducing the tape; and a device for reproducing recorded information from the tape in a reproducing mode while the identification signal reproducing means is reproducing the identification signal from the tape. A video tape recorder comprising a playback control means. 2. A video tape recorder, comprising: an identification signal recording means for generating an identification signal for identifying a reproduced portion of a tape and recording the same when the tape is played; and a recording means for recording on the tape by the identification signal recording means. identification signal reproducing means for reproducing the identified identification signal when recording the tape; and recording for recording information on the tape with the apparatus in a recording mode during a period when the identification signal is being reproduced from the tape by the identification signal reproducing means. A videotape recorder comprising a control means.