JPH0628432B2 - Recording mode switching circuit - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to an improvement of a recording mode switching circuit of a video tape recorder capable of VPS recording in a normal recording mode.

(B) Conventional technology VPS (Video Program System) in West Germany
A program reservation system called as is being used for video tape recorders. This VPS system is disclosed in West German Laid-Open Patent Publication Nos. 3828001 and 3243610. This VPS system reliably records a desired program in an answering machine regardless of a shift in the broadcast time zone of the program or interruption of the broadcast.

FIG. 2 shows a circuit block diagram of a VPS answering machine reservation system conventionally used in a VTR. First, at the time of reservation, by operating the reservation setting button group (9), the reservation setting circuit
Set the reservation code in (20). This reservation code includes a recording start time (code), a reservation channel (code), and V
The PS reservation availability (code) and the recording end time (code) are set in this order. After the setting operation is completed, the reservation code is transferred and stored in the reservation memory. After that, when you move to the reservation execution mode,
The reservation code in the reservation memory is sequentially read. The execution mode setting circuit (22) selectively drives the timer control circuit (24) or the 3H pre-detection circuit (26) and the VPS control circuit (15) according to the VPS availability code. That is, when the VPS reservation setting is made, the VPS reservation mode is set and the above 3
The H front detection circuit (26) and the VPS control circuit (15) are activated,
When the S reservation setting is canceled, the normal reservation mode is entered and the timer control circuit (14) operates. However, although not shown, the execution mode setting circuit (22) sets the V
When the VPS reservation setting is made by detecting that the PS code is not multiplexed, the normal reservation mode may be set.

First, in the VPS reservation mode, the recording start time (code) and the actual time of the clock circuit (25) are input to the 3H pre-comparison circuit (26) in consideration of the fact that the start of broadcasting will be earlier, Three hours ago, the tuning command output is input to the tuning control circuit (23) and the power-on command output is input to the syscon circuit (19). Therefore, the tuning control circuit (23) immediately selects the corresponding reserved channel code as soon as the detection output is input.
(4) and at the same time, the syscon circuit (19) turns on the VTR. The tuning circuit (4) supplies a tuning voltage corresponding to the reserved channel to the tuner (2), selects the reserved channel from the output of the antenna (1), and derives a video signal.

Therefore, the VPS decoder (6) continues to decode the VPS code multiplexed in the video signal from 3 hours ago. This VPS
The code is composed of a program code corresponding to the original program start time and various control codes. The VPS code is latched by the code latch circuit (13) and compared with the recording start code in the reservation code by the VPS control circuit (15).

The VPS control circuit (15) inputs the recording command output to the mode setting circuit (18) when both codes match. As a result, the syscon circuit (19) activates the recording means (5) to start recording.

Further, the VPS control circuit (15) supplies a stop command output to the mode setting circuit (18) when a special program interruption code is input in the VPS code. As a result, the syscon circuit (19) stops the recording means (5). When the program interruption is released, a program code is again generated in the VPS code, and the VPS control circuit (15) again outputs a recording command output. As a result, recording is resumed.

When the program ends, the program code in the VPS code is changed and the VPS control circuit (15) supplies a recording end command output to the syscon circuit (19). As a result, the syscon circuit
From (19), a power-off output is issued to bring the VTR into a power-off state. However, even in this power-off state, the microcomputer part (8) surrounded by the broken line is in the operating state.

Next, the normal reservation mode will be described. First, in the normal reservation mode, when the timer control circuit (24) compares the recording start time code with the actual time and when they match, the recording command output is input to the mode setting circuit (18) and at the same time the channel selection command output is selected. The power-on command output is input to the station command circuit (23) and the power-on command output is also input to the system control circuit (19). Therefore, the video signal of the reserved channel is recorded from the recording start time. After that, the timer control circuit compares the recording end time code with the actual time and outputs a recording end command output when both times match. As a result, the VTR is turned off.

Although the above-described operation is a recording reservation operation for executing the answering machine recording, the VTR naturally allows manual recording. That is, by manually operating the VTR and operating the channel selection button group (3), a desired broadcast signal can be received and a video signal is supplied to the recording means. Therefore, by operating the mode setting button group (S) and inputting a recording command output to the mode setting circuit (18), the recording means records the video signal of the selected channel.

(C) Problems to be solved by the invention However, in the case of the conventional example described above, the VPS system cannot be used in the normal recording mode set by operating the recording button, and the user does not wait until the end of the program. If we didn't continue to monitor the program, we couldn't record it reliably.

(D) Means for Solving the Problems Therefore, according to the present invention, in order to make the VPS system function even in the normal recording mode, the VPS setting operation is performed in conjunction with the VPS setting operation.
VPS that stores the program code in the code and is input afterwards
It is characterized by comparing the program code in the code and controlling the recording state based on the comparison result.

(E) Operation Therefore, according to the present invention, by performing the VPS setting operation without setting the reservation code, the normal recording mode is set and changed to the VPS recording mode similar to the VPS reservation mode.

(F) Embodiment Hereinafter, the present invention will be described according to an embodiment shown in FIG.

FIG. 1 mainly shows the components added to FIG. 2 concretely, and the components of the microcomputer portion (8) surrounded by a broken line are assumed to be configured by software like the conventional circuit.

First, in this embodiment, when the VTR is set to the power-on state, the tuning button group (3) is operated and the tuning circuit (4) supplies the tuning voltage to the tuner (2). Therefore the tuner (2)
Derives a video signal corresponding to the selected channel. Next, the recording button in the mode setting button group is operated to close the corresponding recording switch (S3). The recording command output generated by this closing is set and stored in the mode setting circuit (18) via the lock gate (17). As a result, the syscon circuit (19) inputs the recording setting output to the recording means (5) to perform normal recording. Realize the mode.
Such a configuration is a conventionally known configuration, and the features of the configuration of this embodiment are as follows.

In this embodiment, the video signal to be recorded is input to the VPS decoder, and the decoded VPS code is VPS.
It is input to the code detection circuit (11). Therefore, when a channel in which the VPS code is not multiplexed on the video signal is selected, no VPS code detection output is generated by the VPS code detection circuit (11).

In the present embodiment, when the normally open VPS setting switch (SW1) is closed, the closed output is input to the VPS mode setting circuit (10). The VPS mode setting circuit (10), when VPS code detection output and recording setting output are generated, that is,
When the VTR is in the recording state and the VPS code is multiplexed in the recorded video signal, it is identified that the VPS recording mode can be set, and the VPS recording setting output is issued. Operation lock control circuit to input this VPS recording setting output (16)
Emits a lock control output to put the lock gate in a locked state, and thereafter blocks the passage of each command output to disable manual mode setting. Further, the write pulse generation circuit (12) for inputting the VPS recording setting output is used for the VPS in the video signal.
A write pulse is generated to store the program code included in the code in the code memory (14). Therefore, the code memory stores the program code at the time of the VPS setting operation. Also V
The PS recording setting output is input to the display means (7) and indicates that the VPS recording mode is set.

Therefore, depending on the setting of the VPS recording mode, the code latch circuit (13) thereafter repeats the latch operation of the VPS code in the video signal. The VPS control circuit (15) compares the latch code with the memory code and controls the operation of the VTR.
First, when the program interruption code is input to the VPS code and latched, a stop command output is input to the mode setting circuit (18) from the VPS control circuit (15) and the recording means (5) is stopped. This program interruption state must be released by the generation of the original program code in the VPS code.
Therefore, if the original program code is latched again, the VPS
The control circuit (15) issues a recording command output, drives the recording means (5) again, and restarts recording. The end of recording must be done by changing the program code. Therefore,
When different program codes are latched, VPS control circuit (15)
Inputs the recording end command output to the syscon circuit (19) to generate a power-off output.

The above-mentioned VPS recording mode is the VPS setting switch (S
It is released by closing W1) again, and the normal recording mode is set.

In the VPS recording mode described above, the lock gate (1
Since 7) is locked, it is difficult to set the mode manually. However, even in the VPS recording mode, it may be desired to make a commercial cut during broadcasting, and it is not desirable to lock uniformly. Therefore, in this embodiment, a lock changeover switch (SW2) is provided to control the operation lock control circuit (16). That is, when the normally open lock changeover switch (SW2) is closed, the operation lock control circuit (1
The lock control output of 6) is deactivated, and the lock gate (17)
Unlocks. Therefore, after unlocking, the mode can be manually set. The unlocked state is changed to the original locked state by pressing the lock changeover switch (SW2) again, and the locked state and the unlocked state are reversed every time the lock changeover switch (SW2) is pressed.
The locked state and the unlocked state are displayed on the display means (7).
Will be displayed.

In this embodiment, the operation lock control circuit (16) outputs the lock control output in the initial state immediately after the VPS recording setting output is generated. However, in another embodiment, the operation lock control circuit (16) is in the initial state. It can be considered that the lock control output is deenergized. With this configuration, the lock switch (SW2)
Obviously, manual mode setting is possible unless the circuit is closed. Further, if it is not necessary to lock the manual mode setting during the VPS recording mode setting, as another embodiment, a lock changeover switch (SW2).
A configuration in which the operation lock control circuit (16) and the lock gate (17) are omitted may be considered.

Further, if the command output for releasing the lock is limited to only the pause command output or only the pause command output and the stop output, unnecessary command outputs other than the commercial cut can always be locked.

(G) According to the present invention, when the recording control is performed in the VPS recording mode, it is possible to recognize the recording mode because the display means displays the VPS recording mode. Moreover, there is no fear that recording will fail. Further, when the recording is performed in the VPS recording mode, it is not necessary to continuously monitor the program during the recording period, and the effect is great.

[Brief description of drawings]

FIG. 1 is a circuit block diagram showing an embodiment of the present invention, and FIG.
The figures respectively show conventional circuit block diagrams. (3) …… VPS decoder, (15) …… VPS control circuit, (SW
1) VPS setting switch, (SW2) lock switching switch, (10) VPS mode setting circuit.

Claims (1)

[Claims] 1. A tuner for receiving a video signal in which a VPS code is multiplexed, a recording means for recording a video signal output from the tuner, a recording operation means for setting the recording means in a recording state, and V multiplexed with the video signal output from the tuner
Code decoding means for decoding and sequentially outputting the program code included in the PS code, and a VPS recording setting signal is generated when the recording means is in the recording state and the VPS code is detected by the code decoding means. VPS mode setting means that does not generate a VPS recording setting signal when the VPS code is not detected, and a program code that is decoded by the code decoding means when the VPS recording setting signal is generated from the VPS mode setting means Storage means for storing, a display means for displaying that the recording mode based on the program code is set by the generation of the VPS recording setting signal, a program code output by the code decoding means, and the storage means for storing the program code. And a comparing means for comparing the generated program code with each other. It was when holding the recording means to the recording state, the recording mode switching circuit when a mismatch, characterized in that it comprises a control means for stopping the operation of said recording means.