JPS6247392B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a two-screen television receiver having a recording function and/or a timer function and a function of simultaneously displaying a plurality of programs.

Conventionally, there have been two tuners, and a recording function has been incorporated to record the television broadcasts selected by the second tuner while projecting the television broadcasts selected by the first tuner on a cathode ray tube. A television receiver with a recording function has been proposed.

On the other hand, in a television receiver, in order to select a certain television broadcast using a tuner, the oscillation frequency of a local oscillator controlled by voltage and the carrier wave frequency of the television broadcast are mixed, and then a specific frequency (intermediate frequency) and performs processing such as detection and amplification.

The voltage applied to the above-mentioned local oscillator varies depending on each channel of television broadcasting, and even on the same channel, it varies due to variations in the local oscillator (variations in products). Therefore, it is necessary to set the voltage applied to the local oscillator in advance, but the oscillation frequency of the local oscillator fluctuates due to changes in circuit constants due to changes over time and the like. Therefore, there is a possibility that the tuner may not tune into the preset television broadcasts.

For the above reasons, when using a television receiver with a recording function to record the same or different television broadcasts at the same time while viewing the television broadcasts on a CRT, the target television broadcast The disadvantage was that there were cases in which it was not possible to record. Further, in order to prevent this, it is possible to monitor the television broadcast to be recorded at the time of recording, but the monitor requires complicated operations and has the disadvantage that it spoils the program currently being watched.

There are also television receivers that have a built-in timer function that selects the reserved channel and projects the reserved program on a cathode ray tube when the reserved time matches the current time, or the timer function described above. It also has a second tuner and a recording function,
When the reserved time matches the current time, the second
A television receiver with a recording function for selecting a reserved channel and recording the reserved program has been proposed, and some are commercially available.

In the former type of television receiver, when the start time of a program reserved by someone else or a program that you have reserved but have forgotten, the program being displayed on the CRT suddenly changes. Since the program switches to the reserved program, there is a drawback that important scenes may be missed.Also, with the latter type of television receiver with recording function, even if the current time and the reserved time match and the reserved program starts recording,
Since there is a possibility of erroneous operation when making a reservation, there is a drawback that if it is not possible to monitor whether or not the desired program is actually being recorded, anxiety remains.

It is an object of the present invention to provide a television with a recording function that allows you to confirm whether or not the desired television broadcast is actually being recorded when simultaneously recording the same or different television broadcasts while watching the television broadcast. The purpose is to provide a receiver.

Another object of the present invention is to provide a two-screen television receiver capable of confirming that recording of a reserved program has started when the scheduled program start time arrives without disturbing the program currently being viewed. is to provide.

Traditionally, devices that display two or more television programs simultaneously include a television receiver with a monitor that incorporates two cathode ray tubes, and a television broadcast that is selected by a second tuner using a memory circuit. By temporarily storing the video signal of the television broadcast tuned by the first tuner and replacing a part of the video signal of the television broadcast tuned by the first tuner with the video signal read out from the memory circuit, the first tuner can tune the channel. A two-screen TV that displays a reduced screen of a television program selected by a second tuner (hereinafter referred to as a child screen) on the screen of a television program selected by a second channel (hereinafter referred to as a parent screen). Jiyoung receiver is known.

The present invention uses such a television receiver, and when a recording operation is performed or when the time reserved by the timer function matches the current time,
When receiving or recording a reserved program,
By detecting this, the image currently being viewed on the cathode ray tube is maintained, and at the same time, a second image is scheduled by operating the circuit for obtaining the second image of the television receiver. The image is displayed on the cathode ray tube only for the duration of time.

An embodiment of the present invention will be described with reference to FIG.
In the figure, 1 is a channel selection button for selecting the television broadcast to be displayed on the main screen, and each button and the input terminal of the main screen channel selection device 2 are connected to 1.
They are connected in a pair-to-one pair, and when an arbitrary channel selection button is pressed, a signal is input to the corresponding input terminal of the channel selection device 2. Based on the signal input to the input terminal, the tuning device 2 supplies a tuning voltage preset corresponding to the input terminal to the electronic tuning tuner 3 for the main screen.

The electronic tuner 3 receives a specific television broadcast signal using the tuning voltage supplied from the channel selection device 2 and supplies it to the IF/detection circuit 4 for the main screen. The IF/detection circuit 4 detects the television broadcast signal supplied from the electronic tuner 3 and supplies it to the small screen synthesis circuit 5 as a video signal. The sub-screen synthesis circuit 5 is normally switched to a state in which no sub-screen is displayed, and the cathode ray tube 6
The video signal from the IF/detection circuit 4 is displayed on the screen.

On the other hand, 7 is a channel selection button for selecting the television broadcast to be displayed on the sub screen, 8 is a channel selection device for the sub screen, 12 is an electronic tuning tuner for the sub screen,
13 is an IF/detection circuit for the sub screen, and each operation is performed by the main screen's channel selection button 1, channel selection device 2,
This is similar to the electronic tuning tuner 3 and the IF/detection circuit 4. The small screen generation circuit 9 is supplied with a video signal from the small screen IF/detection circuit 13, generates a small screen video signal, and supplies it to the small screen synthesis circuit.
A sub-screen switching signal a is supplied to the AND circuit 11.

The other input terminal of the AND circuit 11 is normally grounded through the resistor 16 and is therefore at logic "0". However, when the sub-screen ON switch 14 is closed, the voltage of the power supply 15 is applied, so the input to the terminal becomes logic "1", and when the sub-screen ON switch 14 is open, it is logic "0". The output of the AND circuit 11 becomes logic "1". The output of the AND circuit 11 is supplied to the sub-screen synthesis circuit 5 through the OR circuit 10, which switches the sub-screen synthesis circuit 5 to the sub-screen display state and combines it with the video signal supplied from the IF/detection circuit 4 for the main screen. , the small screen video signals supplied from the small screen generation circuit 9 are combined and displayed on the cathode ray tube 6.

The other terminal of the OR circuit 10 is the recording switch 1.
9, and when the recording switch 19 is open, it is grounded by the resistor 20 and has a logic "0", but when the recording switch 19 is closed, the voltage of the power supply 18 is applied, and the logic becomes "1". Thus, the configuration is such that the child screen synthesis circuit 5 is switched to the child screen display state.

The recording switch 19 is also connected to the recording section 17, and by closing the recording switch 19, voltage is supplied to the recording section 17, thereby putting the recording section 17 into a recording state. The recording unit 17 is connected to the IF/detection circuit 13 for the sub-screen, and records the television broadcast tuned by the electronic tuning tuner 12 for the sub-screen while the recording switch 19 is closed. I'm starting to do that.

Since the present invention has the above-described configuration, even if the sub-screen ON switch 14 is open, if the recording switch is closed so that the recording unit 17 can start recording, the recording unit 17 can start recording. At the same time, by supplying a logic "1" signal to the child screen synthesis circuit 5 through the OR circuit 10, it is switched to the child screen display state, the main screen and the child screen are combined, and the current recording is performed on the cathode ray tube 6. Television broadcasts selected by the electronic tuning tuner 12 for the small screen inside can be displayed.

Also, the output of the recording switch 19 is connected to the logical sum circuit 1.
By using a configuration in which the power is not directly supplied to 0 but via a monostable oscillator or the like, the television broadcast selected by the electronic tuning tuner for the sub-screen is displayed for a certain period of time after the recording switch 19 is closed. It is also easy to do.

According to this embodiment, when viewing a television broadcast and simultaneously recording the same or a different television broadcast, there is an advantage that the content being recorded can be monitored simply by pressing the recording switch. Furthermore, since the monitor image is automatically deleted after a certain period of time has elapsed from the start of recording, the viewing of the original television broadcast is less likely to be disturbed.

Next, as another embodiment of the present invention, a case will be described using FIG. 2 in which, when the reserved time and the current time match, the reserved program is displayed as a sub-screen on the same cathode ray tube. In the figure, the same reference numerals as in FIG. 1 represent the same parts.

The other terminal of the OR circuit 10 is a timer circuit 21
As will be described later, normally a logic "0" signal is supplied. However, when the reserved time and the current time match, the logic “1”
The configuration is such that the signal is supplied and the sub-screen synthesis circuit 5 is switched to the sub-screen display state.

The timer circuit 21 stores the reservation time and reservation channel inputted through an input device (not shown), and ticks the current time using a reference frequency supplied from a reference oscillator (also not shown), so that the current time and reservation time are When a match occurs, the output to the OR circuit 10, which is normally logic "0", becomes logic "1" and a signal is supplied to the input terminal of the sub-screen channel selection device 8 corresponding to the reserved channel. do.

Since this embodiment has the above configuration, the child screen can be turned on.
Even if the switch 14 is open, the timer circuit 21 selects the reserved channel using the sub-screen channel selection device when the reserved time and the current time match, and displays the reserved channel. By generating a signal in the child screen generation circuit 9 and supplying it to the child screen synthesis circuit 5, and supplying a logic "1" signal to the child screen synthesis circuit 5 through the OR circuit 10, this signal is generated as a child screen. By switching to the display state, the main screen and the child screen can be combined and displayed on the cathode ray tube 6.

It is also easy to simultaneously control the recording device section (not shown) to put it in a recording state using the signal supplied from the timer circuit 21 to the OR circuit 10, so that it can be monitored on a two-screen TV display while recording. It is clear that this can be done.

According to this embodiment, there are the following advantages.

1. Since the recorded video is displayed on a small screen only for a certain period of time from the start of recording, there is virtually no possibility that the reserved program will interfere with the program currently being viewed.

2. When recording a reserved program, you can monitor the recording on a sub-screen and confirm that there were no erroneous operations when making the reservation.

3 Recording can be monitored reliably without any special operations.

[Brief explanation of the drawing]

1 and 2 are block diagrams each showing an embodiment of the present invention. 1... Tuning button, 2... Tuning device, 3... Electronic tuning tuner, 4... IF/detection circuit, 5...
Child screen synthesis circuit, 9... Child screen generation circuit, 17...
...recording section, 19...recording switch, 21...timer circuit.

Claims (1)

[Claims] 1. Selecting television signals and
and first and second receiving circuits that generate a second television video signal; and a sub-screen composition that uses the first television video signal as a main screen and synthesizes a second television video signal thereon as a sub-screen. circuit and the sub-screen composition circuit to display only the first television image signal on the cathode ray tube, or to display only the first television image signal on the CRT.
and a screen switching means for switching whether to display the second television video signal on two screens; and a recording means for the second television video signal; , so that the second television video signal is displayed as a sub-screen on the cathode ray tube for a scheduled time.
A two-screen television receiver characterized in that a sub-screen synthesis circuit is controlled by screen switching means.