JPS5840870B2 - Program reservation system television receiver - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a program reservation type television receiver that controls the television receiver according to the contents of a program set in advance.

What is a TV receiver that uses a program reservation system? Parent listeners check the channel number and start time of the program they want to watch while checking a program list in a newspaper, etc. At each start time, they turn on the TV receiver and check the channel number. In order to avoid the trouble of having to tune in to the program or missing a program, you can register the channel number of the program you want to watch that day and information such as its start and end times in advance in the program memory. The television receiver has a function of automatically setting a channel number and turning off the power of the television receiver.

In this case, it is possible to reserve programs not only for one day but also for a long period of time, such as for one week or repeatedly.

By the way, when a program is executed on such a program reservation system television receiver, the disadvantage is that when the start time arrives, the television receiver starts operating unilaterally, regardless of whether the viewer watches the program or not. There is.

This leads to wasted electricity, noisy TV audio, shortened TV receiver life, risk of fire, etc. Even if the preset start time arrives, if the viewer is out of the house, etc. If the television receiver cannot be watched, the television receiver will operate unnecessarily, and a function that automatically shuts off the power to the television receiver is required.

The present invention provides means for solving the problems of such program reservation type television receivers, and will be described in detail below with reference to the drawings.

First, the general principle of a program reservation type television receiver will be explained with reference to FIG.

11 is a shift register type program memory, in which the channel number (Nl, N2, etc.) of the program that the viewer wants to watch is stored.
...), start time (Tal, Ta2...)
) and end time (Tbl, Tb2...) are registered in advance.

The start time or the end time is a start/end selection signal output from the control circuit 15, and either one is selected by the ten multiplexers and input to the register 9.

The LSB of the register 9 is used to store whether the time signal currently stored in the register 9 is a start time or an end time.

Reference numeral 6 is a clock circuit, and reference numeral 8 is a comparison circuit that outputs a coincidence output signal when the output of the synchronization circuit 6 and the output of the register 9 match.

Further, 7 is a start signal detection circuit for sending a power ON signal to the power supply circuit 3 when the coincidence output signal is a start signal.

With this power ON signal, the power supply circuit 3 enters the ON state and supplies voltage from the power supply terminal 2 to each circuit in the television receiver, but when the power OFF signal is sent from the control circuit 15, the power supply circuit 3 enters the ON state. Stop supplying incoming voltage.

Note that 1 is a commercial power input terminal.

The control circuit 15 also has a channel selection output terminal 16 for taking in channel signals from the program memory 11 and sending them to a tuner control circuit (not shown).

It is also assumed that the portion surrounded by a broken line 14 is backed up by a battery or the like when the power supply circuit 3 is in a cut-off state.

Next, the operation of this device will be explained.

It is assumed that the power supply circuit 3 is currently in a cut-off state, and the register 9 contains the next start time Tal and its LSH contains a start signal.

After that, when the output signal of the clock circuit 6 coincides with the start time Tal, a coincidence output signal is output, and as a result, a power ON signal is output to the power supply circuit 3, and the power supply circuit 3 is turned on. A predetermined voltage is supplied to each part.

As a result, the control circuit 15 starts operating, and the channel signal N1 is sent out from the channel selection output terminal 16 in response to the coincidence output signal and the start (identification) signal from the LSB of the register 9.

At the same time, the L of the multiplexer 10 and the register 9
An end selection signal is sent to SB, and end time Tbl is entered in register 9.

In this state, the TV receiver is set to the specified channel number N1.
signals, and both video and audio continue to operate normally.

Thereafter, when the output of the clock circuit 6 coincides with the end time Tbl, the coincidence output signal of the comparison circuit 8 and the end (identification) signal from the LSB of the register 9 are sent to the control circuit 15.
sent to.

This causes the control circuit 15 to control the program memory 11.
A shift pulse is output to the LSB of the register 9.
and outputs a start selection signal to the multiplexer 10.

As a result, the start time Ta2 is entered in the register 9.

After this, the control circuit 15 confirms that no coincidence output signal is output from the comparator 8, and then sends out a power OFF signal to turn off the power supply circuit 3.

In this case, if a coincidence output signal is output (in this case, when the end time Tbl and start time Ta2 are equal), the transmission of the power OFF signal is stopped, and the channel signal N2 is sent from the channel selection output terminal 16 to the tuner. Send to control circuit.

Then, the next end time Tb2 is sent to the register 9 in the same manner as described above and maintained as it is.

The above is an example of the operation of a program reservation type television receiver.

In such a case, all the operations proceed automatically, which causes the inconvenience that the power supply circuit 3 is turned on even though no viewer is present, as described above.

The present invention maintains the state of the power supply circuit 3 in the power-on state or forcibly changes (cuts it off) depending on the presence or absence of an artificial input signal from the outside to the above-mentioned program reservation system television receiver. By controlling the power supply circuit, the power supply circuit is prevented from operating unnecessarily, and one embodiment thereof will be described in detail below.

FIG. 2 shows an embodiment of the present invention, which is operated by being connected to the circuit shown in FIG.

18 is a flip-flop circuit, and terminal 1 is connected to its set input and the reset input of the 1/N frequency divider circuit 20.
9 is connected to the trigger output terminal 4 of the power supply circuit 3 in FIG. 1, the output terminal 23 of the AND circuit 22 is connected to one input terminal 13 of the OR circuit 14 in FIG.
The clock input terminals 21 of are respectively connected to the minute pulse output terminals 5 of the clock circuit 6 shown in FIG.

If the clock circuit 6 outputs an output signal for the next start time while the power supply circuit 3 is currently in the cutoff state, the power supply circuit 3 will be turned on as explained in FIG.

At this time, a trigger pulse is sent from the trigger output terminal 4 to the flip-flop circuit 18 and the 1/N frequency divider circuit 20.

This trigger pulse sets the flip-flop circuit 18, so that the output Q becomes high level.

Furthermore, since the 1/N frequency divider circuit 20 is reset by the same trigger pulse, its output becomes low level.

Therefore, the output terminal 23 of the AND circuit 22 becomes low level, and since no signal is input to the control circuit 15, the power supply circuit 3 maintains the on state.

On the other hand, since minute pulses (pulses that occur every minute) are input to the input of the 1/N frequency divider circuit 21, after N minutes, the same
The output of the 7N frequency divider circuit 21 becomes high level.

If the reset switch SW1 is not pressed during this time, the output Q of the flip-flop circuit 18 remains at a high level, and therefore the output terminal 23 of the AND circuit 22 is switched to a high level.

This signal is passed through the OR circuit 14 to the control circuit 15.
is input as a match output signal.

In this state, as described above, the LSH of the register 9 contains the end signal, so the control circuit 15 performs the same operation as described above to input the next start time into the register 9, and then The power supply circuit 3 is cut off.

Furthermore, if the reset switch SW1 is closed within N minutes, the output Q of the flip-flop circuit 18 becomes low level, so even if the output of the 1/N frequency dividing circuit 21 becomes high level after N minutes. Even if the AND circuit 2
Since the output terminal 23 of No. 2 remains at a low level, the control circuit 15 is not operated, and the power supply circuit 3
remains closed until the next end time.

In this way, the present invention provides that if the reset switch SW1 is not pressed within N minutes after the power supply circuit 3 is turned on at the start time, the reset switch SW1 is forcibly reset after N minutes regardless of the contents of the program memory 11. This causes the power supply circuit 3 to be cut off.

Next, an application example of the present invention will be explained using FIG. 3.

This circuit is operated by being connected to the circuit shown in FIG.

Output terminal 17 of the output Q of the flip-flop circuit 18
A control input terminal 29 of an analog signal switching circuit consisting of analog switches 26 and 27 and an inverter 28 is connected to the terminal.

A TV audio signal is connected to the input terminal 24 of the analog switch 26, and an alarm signal generation circuit 25 is connected to the analog switch 27. Either one of these signals is selected by the control input terminal 29 and sent to the amplifier. The sound is emitted from the speaker 31 via 30.

In this way, the output Q of the flip-flop circuit 18 is at a high level under the conditions explained in FIG. 2, so the reset switch SW1 is turned on after the power supply circuit 3 is turned on. Until you press or N
Since the analog switch 26 is turned off and the analog switch 27 is turned on for a few minutes, an alarm sound is emitted from the speaker 31 to notify the viewer that the start time has arrived.

Of course, if the reset switch SW1 is pressed within N minutes, the state of the analog switch is reversed, so the alarm sound is switched to the TV sound, and the TV receiver enters a normal reception state.

FIG. 4 shows another example of application of the present invention.

This circuit is operated together with the circuit shown in FIG. 2, and the output terminal 17 of the output Q of the flip-flop circuit 18 and the control input terminal of the analog switch 33 are connected.

When the output Q of the flip-flop circuit 18 is at a high level, the analog switch 32 is in a conductive state, and therefore, compared to the case where the analog switch 32 is in a cut-off state, the sound is reduced by an amount determined by resistors R3, R4, and R5. The audio signal from the signal input terminal 24 is attenuated and becomes muted.

Therefore, the TV audio output is muted for N minutes after the power supply circuit 3 is turned on until the reset switch SW1 is pressed, and normal audio output is restored if the reset switch SW1 is pressed within N minutes. do.

As described above, the present invention does not lose the convenient feature of automatically advancing the program of the program reservation type television receiver, but on the other hand, the above-mentioned power consumption, television sound noise, and television receivers are avoided. This eliminates the fatal drawbacks of shortening the lifespan of the receiver and raising the risk of fire.

Especially when the content of a program is long-term, such as a week's worth, viewers often forget the program's start time and other details and are not near the TV set. It is thought that there are many cases where the operation of cutting off the source of the archetype is neglected.

As described above, the effect of implementing the present invention in a program reservation type television receiver is very large.

Note that the embodiments of the present invention are merely examples, and it goes without saying that various other embodiments and application examples are possible.

For example, in this embodiment, a 17N frequency dividing circuit is used, but as another example, the same effect can be obtained by inputting a time signal N minutes after the start time to the register 9 of FIG.

Further, although a switch is used as a means for obtaining an input signal from the outside, this is not necessarily the case.

Furthermore, there are many other applications that can be considered, such as setting the brightness level to the minimum value between the time the power is turned on and the time the reset switch is pressed, or displaying the contents of a program on a cathode ray tube.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing the general configuration of a program reservation type television receiver, FIG. 2 is a partial electrical wiring diagram of a program reservation type television receiver in an embodiment of the present invention, and FIGS. 3 and 4. 1 is a partial electrical wiring diagram showing an application example of the present invention. 11...Program, 9...Register, 6...Clock circuit, 8...Comparison circuit,
15...control circuit, 3...power supply circuit,
18...Flip-flop, 20...
1/N frequency divider circuit, SWl...Reset switch.

Claims (1)

[Scope of Claims] 1. A function to automatically switch channels and turn on/off the power of a television receiver according to the content of the program in which the channel number and start and end times of the program are arbitrarily set in advance. In a program reservation system television receiver with a program reservation method, when the power of the television receiver is automatically turned on at the start time of the program set in the above program, the program reservation method is 1. A program reservation type television receiver comprising a control means for automatically cutting off power to the television receiver again after the above-mentioned time has elapsed if a signal is not inputted by a suitable means. 2. The control means includes a flip-flop circuit, a reset switch for resetting the flip-flop, and a frequency dividing circuit for counting the time signal generated from the time circuit;
It consists of an AND circuit that outputs a signal to cut off the power to the television receiver when the outputs of the flip-flop circuit and the frequency divider circuit match, and automatically turn off the TV at the start time of the program set in the program. After the TV receiver is powered on, if the reset switch is not pressed before the frequency divider circuit finishes counting, the AND circuit outputs an output and the TV receiver's power is automatically cut off. A program reservation type television receiver according to claim 1, characterized in that it is configured as follows. 3. An analog signal switching circuit for switching between the TV audio signal and the alarm signal output from the alarm sound generation circuit is provided in a part of the television audio circuit, and the switching of the analog signal switching circuit is controlled by the output signal of the flip-flop. By doing this, the alarm sound is configured to be emitted from the speaker from the time the TV receiver is automatically turned on at the start time of the program set in the above program until the time when the above reset switch is pressed. A television receiver with a program reservation system according to claim 2, characterized in that: 4. By providing a mute circuit in a part of the television audio circuit and controlling the ON/OFF state of the mute circuit using the output of the flip-flop, the television receiver is automatically turned on at the start time of the program set in the program. 3. The program reservation type television receiver according to claim 2, wherein the mute circuit is configured to operate from when the power is turned on until the reset switch is pressed.