JPS5948452B2 - Recording/playback device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a recording/reproducing device, and particularly to a VTR&C.
When recording TV programs, etc. with a VTR, which makes it easy to check the operation before recording, many programs are temporary and cannot be rerecorded, resulting in recording failures. is not allowed.

For this reason, the VTR user may be concerned about whether or not the VTR will function properly and record without error when starting or during recording. Particularly when using a VTR in which the recording result cannot be monitored during recording, or when the recording start time is set in advance using a timer, the above-mentioned concerns may arise. In such cases, we check the operation of the VTR before recording.

The conventional method for performing an operation check is to first temporarily record a program for several seconds, then rewind the tape, then perform playback and rewind the tape back to its original position. If the screen obtained during the reproduction is good, it is assumed that the VTR 10 is functioning normally, and then regular recording is started. However, this method is complicated and time-consuming because each of the above operations is performed manually. Furthermore, when rewinding the tape after playback is complete, it is difficult to rewind the tape to the original position accurately. Accurately rewinding the tape 15 to its original position is critical for successful splicing with programs previously recorded on the tape. The present invention was made in view of the above-mentioned circumstances, and by pressing the check button,
After recording is automatically performed for a predetermined time of 20 minutes, rewinding is performed, and after the next reproduction is performed, rewinding is performed again to return the tape to its original position.

Embodiments of the present invention will be described below with reference to the drawings.

In this embodiment, the VTR is provided with a check button for automatically checking the operation before performing regular recording. When this check button is pressed, the operation shown in FIG. 1 is automatically performed. That is, first, the program is set to recording mode and a certain program is temporarily recorded for a predetermined period of time, for example, 5 seconds. Rewinding is then performed and the tape is rewound 30 minutes to the start point of the temporary recording. Thereafter, the reproduction mode is established and the temporarily recorded signal is reproduced on the screen of the receiver. Next, the tape is rewound again and the tape is returned to its original position accurately, completing the check. Then, apply it to the screen obtained during the above playback.
The state of the TR can be determined. Next, regular recording is started immediately, or a recording start time is set using a timer. =ζ [1] Figure 2 shows a check circuit system for automatically carrying out the above operations and the circuits necessary for checking the VTR.

In FIG. 2, the check circuit includes the check button 1, flip-flops 2 and 3, monomulti 4, OR gate 5,
It is constructed as shown in the figure by AND gates 6, T, 8, 9, and 10 and a tape counter 11.

As the counter 11, a known mechanical counter may be used in which three drums on which numbers are displayed are rotated by tape running.

Such a mechanical counter generally has three drums "00
A switch is provided that closes the electrical contact when "0" is displayed, and in this embodiment, when this switch is closed during rewinding, a stop signal is received and the tape is stopped at its original position. I have to. Next, in Figure 2, 1
2 is a tuner, 13 is a television receiver, 14 is a recording circuit,
15 is a reproduction circuit, 16 is a drum servo circuit, IT is a capstan servo circuit, 18 is a drum motor, 19 is a capstan motor, 20 is a changeover switch circuit 21, 22
is a rotating head, 23 is a tape, 24 is a capstan, 2
5 is a pinch roller, and 26 is a plunger. Next, the operation of the above configuration will be explained with reference to FIG.

First, press the set button on the counter 11 to display "000".

Next, when check button 1 is pressed, the voltage +B is differentiated by the capacitor and resistor to obtain a trigger pulse. This trigger pulse sets the flip-flop 2 and also triggers the monomulti 4 via the OR gate 5. As a result, the output Q of flip-flop 2 becomes "1" (high level), and the output Q3 of monomulti 4 also becomes "moon."
1, the flip-flop 5 is reset and its output Q2 becomes "O" (low level). Output Q1 is applied to AND gates T, 8, lO, output Q2 is applied to AND gate 9, and output Q2 is applied to AND gates 7, 8. Also, the output Q3 is added to AND gates 8 and 9,
Output Q3 is applied to AND gate 10. As a result, all three inputs of the AND gate 8 become "moon" and the recording command ◆ signal is output from the AND gate 8.

In response to this recording command signal, the recording circuit 14, drum servo circuit 16, and capstan servo circuit 17 are operated, and the switch circuit 20 is closed to the REC side. As a result, the drum motor 18 and the capstan motor 19
is rotated, the rotating heads 21, 22 and the capstan 24 are rotated, and the tape 23 is run in the forward direction. As a result, the signal from the tuner 12 is applied from the recording circuit 14 to the receiver 13, and is also applied to the rotary heads 21, 22 via the switch circuit 20 and recorded on the tape 23. In this state, the recorded signal can be monitored by the receiver 13. Incidentally, the drum servo circuit 16 and the capstan servo circuit 19 continue to operate until the check is completed, and during this time the rotary heads 21, 22 and the capstan 24 may continue to rotate. When this recording is performed for 5 seconds, the monomulti 4 is reversed.

As a result, the recording command ◆ signal disappears, recording is stopped, and the two inputs of the AND gate 10 become "1", and the AND gate 10 outputs a rewind command signal. The plunger 26 is operated by this rewind command ◆ signal, and the supply reel shaft is reversed, thereby performing rewinding. As a result of this rewinding, the value displayed on the counter 11 decreases from the value at the time when the above-mentioned recording was completed, and
3 becomes "000" when it returns to the recording start point. This closes the switch of the counter 11 and applies a trigger pulse to the AND gate T. At this time, the three inputs of the AND gate T become "1", the output sets the flip-flop 3, and the output Q2 becomes the moon. At the same time, the trigger pulse is applied to the monomulti 4 via the OR gate 5, and the monomulti 4 is triggered again. As a result, the rewind command signal disappears, and the AND gate 9 is activated. The two inputs become "1", and the AND gate 9 outputs a reproduction command signal.

This regeneration command signal closes the switch circuit 20 to the PB side and operates the regeneration circuit 15. As a result, the signals recorded on the tape 23 are transmitted to the rotary heads 21 and 22.
The image is reproduced by applying this reproduction signal to the receiver 13 through the reproduction circuit 15. When this reproduction is performed for 5 seconds, the monomulti 4 is reversed again.

As a result, the reproduction command signal disappears and the reproduction ends, and at the same time, the rewind command signal is applied again from the AND gate 10, and rewinding is performed again. Due to this rewinding, the display value of the counter 11 decreases from the value at the end of the playback, and when the tape 23 returns to its original position, the display value becomes "
000". As a result, the counter 11 outputs a trigger pulse again. As a result, the flip-flop 3 is reset by the output of the AND gate 7, and
Two inputs of the AND gate 6 become "1", and the output of the AND gate 6 resets the flip-flop 2. Therefore, the outputs Ql and Q2 both become [0], thereby bringing the TR into a stopped state. According to the above, by pressing the check button 1, the operation described with reference to FIG. 1 is automatically performed, and the operation of the TR can be checked. Furthermore, after the check is completed, the tape 23 can be accurately returned to its original position. In this embodiment, a mechanical counter 11 equipped with a switch is used to return the tape to its original position after the check is completed, but the following three methods can be considered to return the tape to its original position. It will be done.

The first method utilizes CTL pulses recorded on the control track of the tape during recording.
That is, the CTL pulses recorded during the above-mentioned 5-second temporary recording are counted and stored during this temporary recording, and when the countdown reaches "0" during the next rewinding, the tape is stopped. During playback, the recorded CTL pulses are counted, and by counting down during the next rewind and stopping the tape when it reaches "o", the tape can be accurately returned to the starting position of the temporary recording. can. The second method is to record a key signal on an audio track during temporary recording, and at the start and end of temporary recording, an appropriate key signal is recorded in place of the audio on the audio track.

In this method, when rewinding, reproducing, and rewinding after provisional recording, it is sufficient to run the tape until the above-mentioned queue signal is detected, so that the structure can be simplified. The third method is to improve the tape counter, for example, by adding a more accurate mechanical counter to the lower digits of the mechanical counter, and using the added counter value to determine the tape position during operation check. Rub it well.

As described above, the present invention provides a recording means for recording by running a tape for a predetermined time by pressing a check button;
rewinding means for rewinding the tape after the end of the recording; stopping means for detecting the recording start position of the tape and stopping the tape during the rewinding; and running the tape again from the recording start position for a predetermined period of time. and a reproducing means for reproducing the recorded signal, and after the reproduction is finished, the rewinding means C rewinds the tape and the stopping means stops the tape. This relates to a playback device.

Therefore, according to the present invention, the check performed prior to the start of recording can be automatically performed by pressing the check button, so that the check can be performed reliably without requiring the time and effort required in the conventional method. .

[Brief explanation of the drawing]

Fig. 1 is a diagram for explaining an example of a series of operations performed during a check, Fig. 2 is a circuit diagram showing an embodiment of the present invention, and Fig. 3 is an illustration for explaining the operation of Fig. 2. This is a time chart. In the symbols used in the drawings, 1 is a check button, 2 and 3 are flip-flops, 4 is a monomulti, 5 is an OR gate, 8, 9, and 10 are AND gates, 11 is a tape counter, 14 is a recording circuit, and 15 is a is a reproduction circuit, 16 is a drum servo circuit, 17 is a capstan servo rotation, 2
1 and 22 are rotating heads, 23 is a tape, and 26 is a plunger.

Claims (1)

[Claims] 1. A recording means for recording by running the tape for a predetermined time by pressing a check button, a rewinding means for rewinding the tape after the recording is completed, and a rewinding means for detecting the recording start position of the tape at the time of rewinding. It has a stopping means for stopping the tape, and a reproducing means for reproducing the recorded signal by running the tape again for a predetermined time from the recording start position, and after the reproduction is finished, the tape is replayed by the rewinding means. A recording and reproducing apparatus characterized in that the tape is stopped by the rewinding stop means.