JPH048487Y2 - - Google Patents

Description

[Detailed Description of the Invention] (a) Field of Industrial Application The present invention relates to a video tape recorder (VTR) having a timer recording function and capable of automatically setting a recording start position.

(b) Conventional technology In a VTR equipped with a timer recording function, the user usually sets the recording start and end times, reception channel, recording speed, etc., and selects the tape cassette for recording.
The system is configured so that preparation is completed by setting the unit on the VTR and turning on a switch that specifies the timer recording standby state. In this timer recording standby state, the power supply to the main parts of the VTR is stopped, and the microcomputer for the timer circuit compares the set start time with the current time, and when they match, the power supply circuit and microcomputer Outputs the timer recording signal to the system control circuit. While this signal is being output, power is supplied from the power supply circuit to the main parts of the VTR, and the VTR enters the recording state under the control of the system control circuit.

When the current time and end time match, the timer recording signal will no longer be output and the recording operation will stop.
The power is turned off.

VTRs equipped with a timer recording function are configured to perform the operations described above, but the trouble for the user is that when setting the tape cassette,
The problem is that the recording start position on the tape must be manually set. This requires fast-forwarding and rewinding while viewing the reproduced image, which takes a considerable amount of time.

For this reason, if you do not have much time before the recording start time, or if you make a mistake in the setting operation and cannot record the start part of the program, or if you do not have time to set the start position, record over the already recorded part. There is a risk that this may occur.

One possible method for solving this inconvenience is to apply the technique disclosed in Japanese Unexamined Patent Publication No. 57-86149 to the timer recording function. The above publication describes a VTR in which if the power switch is turned off during rewinding, the power remains on regardless of the switch status until rewinding is complete, and the power is turned off after rewinding is complete. .

If this is suitable for a timer recording function, a configuration as shown in FIG. 4 can be considered. Timer circuit (microcomputer) 1
When signal A from the switch designating the timer recording standby state is applied to the timer circuit 1, the VTR
System control circuit 2 (operation control device)
A signal B designating a timer recording standby state is output for the timer recording standby state. When this signal B is input, the system control circuit 2 controls a power supply circuit (not shown) to stop supplying power to other parts except the timer circuit 1 and the system control circuit 2. Therefore, the VTR enters a timer recording standby state. Next, when the timer recording start time arrives, the timer recording signal C is output from the timer circuit 1, and in response to this, the system control circuit 2 controls the power supply circuit so that power is also supplied to the mechanism, tuner circuit, etc. This starts timer recording.

The standby state designation signal B is supplied to the system control circuit 2 via the NAND gate 3. The other input is the system control circuit 2 that specifies fast forward and rewind status.
A signal D from is input. Therefore, even if signal A from the timer recording standby state designation switch is input, if the VTR is in the rewind state at that time, the standby state designation signal B will not be applied to the system control circuit, and therefore the power will not be supplied. will not be stopped. When the send-back operation is completed, the auto-stop function of the VTR is activated, the signal D designating the fast forward/rewind state is no longer output, and the standby state designation signal B is supplied to the system control circuit 2.

For example, if you want to start a new recording from the beginning of an already recorded tape, you can set the start and end times, operate the VTR to rewind,
If you turn on the timer recording standby state designation switch,
The VTR continues rewinding, and when rewinding is complete, it automatically enters a timer recording standby state, eliminating the need for the troublesome operations described above.

However, if you do not want to erase the recorded portion, the above configuration is not possible and it is necessary to consider other methods.

(c) Purpose of the invention The present invention has been made in view of the above points, and an object thereof is to provide a VTR that can automatically set the recording start position when setting timer recording.

(d) Structure of the invention In this invention, when the timer recording standby state designation switch is turned on, the system control circuit is activated.
Determines whether or not the control signal is played while the VTR is in playback mode. That is, it is determined whether the tape is a recorded portion or a non-recorded portion. When no control signal is detected, the VTR is placed in a rewinding state, and when a control signal is detected, tape running is stopped and the VTR is placed in a timer recording standby state. If a control signal is detected for the first time, it will be in fast forward mode until it is no longer detected.
After detecting a non-recorded portion, the system stops and enters a timer recording standby state.

(e) Examples Examples of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing the functions of the present invention, FIG. 2 is a block diagram when a microcomputer is used, and FIG. 3 is a flowchart of FIG. 2.

In FIG. 1, 4 is a standby state designation switch;
5 is a means for putting the VTR into a playback state by inputting the switch; 6 is a means for detecting a playback control signal; 7 is a means for putting the VCR into a rewind state when no control signal is detected; 8 is a fast forwarding means when a control signal is detected means 8 for fast-forwarding for a first predetermined period (for example, 2 seconds) when a playback control signal is detected in the rewinding state; 10 is means for fast-forwarding for a first predetermined period (for example, 2 seconds) when the control signal is no longer played while in the fast-forwarding state; 11 is a means for fast forwarding the VTR for a second predetermined time (for example, 1 second) when the first and second predetermined time fast forwarding is completed;
12 is a means for setting the VTR in a timer recording standby state after the VTR is in a stopped state.

Figure 2 shows the above configuration realized by a system control circuit using a microcomputer (microcomputer). We are prepared. The microcomputer 13 receives a reproduction control signal a from the control head, a signal b from a recording position setting/timer recording standby command switch 14, a standby command signal c from a timer circuit 15, and a timer recording signal d.

The microcomputer 13 outputs fast forward (FF), rewind (REW), playback (PLAY), stop (STOP), power control signal (P.ON), etc., and controls the mechanism, recording/reproducing circuit, power supply circuit 16, etc. controlled. A timer recording standby designation switch 17 is connected to the timer circuit 15, and when this switch is turned on, a standby command signal is applied only to the timer circuit 15, and the standby command signal c from the timer circuit 15 is is applied to the microcomputer 13, and the power supply is stopped. In other words, the timer recording standby state is entered.

When the switch 14 is turned on, a standby command signal is applied to the microcomputer 13 and the timer circuit 15. At this time, the standby command signal c from the timer circuit is ignored, and the operation shown in the flowchart of FIG. 3 is performed.

That is, when the switch 14 is turned on, the VTR enters the playback state (the PLAY signal is output). When a control signal is input to the terminal 18 in the reproduction state, the FF signal is output and the VTR enters the fast forward state. In the VTR that we are currently considering, a playback control signal can be obtained even in the fast-forward or rewind state, and as long as the control signal is detected, the VTR remains in the fast-forward state.

When the control signal is no longer detected in this fast-forwarding state, the fast-forwarding state continues for one second, and then a STOP signal is output and tape running is stopped.

In addition, if the playback control signal is not detected in the playback state, the REW signal is
3, the VTR enters the rewinding state,
This state continues until the control signal is detected. When a playback control signal is detected, an FF signal is output, the device enters a fast-forward state for 2 seconds, and then stops. After the VTR comes to a halt, a P.ON signal is output, and power supply to the circuits other than the timer circuit 15 and microcomputer 13 is stopped. Due to this
The VTR is set to a timer recording standby state.

Although not shown, the microcomputer 13 is also applied with an output from a tape end sensor that detects the end or start end of the tape. Therefore, if the control signal is not detected in the rewinding state and the tape is rewound to the beginning of the tape, the tape end detection signal is received.
The VTR will go into fast forward mode for 2 seconds and then stop. After that, it enters a timer recording standby state.

By detecting the playback control signal in this manner, the unrecorded portion of the tape is automatically set to the timer recording start position in the timer recording standby state. When the recording start time comes, the timer circuit 15 outputs a timer recording signal d, the power is turned on, and recording starts.

In the above operation, when a non-recorded part is detected and immediately before is in fast forward mode, fast forward for about 1 second,
The reason why the program is fast-forwarded for about 2 seconds in the rewind state is to prevent overlapping recording and to form a predetermined unrecorded portion between recorded programs. This time can be set freely.

In the above description, power is supplied to the timer circuit 15 and the microcomputer 13 in the standby state. On the other hand, the configuration may be such that power is supplied only to the timer circuit 15, and the timer circuit 15 controls the microcomputer 13 and the power supply circuit 16. in this case,
During the period from when the switch 14 is turned on until it is stopped, it is necessary to control the supply of power from the power supply circuit 16 to the microcomputer 13 and other parts of the VTR using control signals from the microcomputer 13. .

Furthermore, although the configuration shown in FIG. 2 cannot handle the case where it is acceptable to erase the recorded portion, it can be handled by setting it so that when the standby command switch 17 is turned on, the operation explained in connection with FIG. 4 can be performed. .

(c) Effects of the invention As described above, according to the invention, there is no need to manually search for and set unrecorded areas, which saves time and effort.
It's practical.

[Brief explanation of the drawing]

Fig. 1 is a block diagram showing the functions of the present invention, Fig. 2 is a block diagram of an embodiment using a microcomputer, Fig. 3 is a flowchart according to Fig. 2, and Fig. 4 is a block diagram showing a conventional example. It is. Explanation of main symbols, 4...Standby state command switch, 5...Means for setting the playback state, 6...Means for determining recording/non-recording, 7...Means for setting the rewinding state, 8
...means for bringing it into a fast-forward state, 11...means for stopping,
12...Means for setting the standby state.

Claims (1)

[Scope of utility model registration request] In a video tape recorder having a timer recording function, a switch for commanding a timer recording standby state, means for putting the video tape recorder into a playback state by turning on the switch, means for determining recorded/unrecorded portions of the tape, and the above-mentioned means for fast-forwarding when a recorded portion is determined in a playback state;
Similarly, means for setting a rewinding state when a non-recorded portion is determined in the playback state, and means for determining a non-recorded portion in the fast-forwarding state and a recorded portion in the rewinding state. 1. A video tape recorder comprising: means for bringing the video tape recorder into a stopped state; and means for putting the video tape recorder into a timer recording standby state after the stopped state.