JPS6028385A - Television receiver - Google Patents

Abstract

PURPOSE:To offer a PinP television receiver not requiring a tuner, a channel selection circuit and a VIF video detecting circuit for slave screen independently of those for master screen by utilizing an external device such as a video tape recorder or the like provided with a tuner and a channel selection circuit. CONSTITUTION:A P in television receiver is a receiver possible for separate programs on a master and a slave screen by connecting other external device 71 to a video input of the P in P television receiver. When a mode changeover switch 61 and a master/slave changeover switch 62 are thrown as shown in Fig., a signal C for master screen is a video signal (a) through a tuner, a channel selection circuit 11 and a VIF video detection circuit 12, and a signal (d) for slave screen is a video signal (b) from an external device 71. The signal (d) for slave screen is stored in a memory 51 by a clock obtained at a write clock generating circuit 25 by using a synchronizing signal obtained by synchronizing separator circuit 24. Moreover, a slave screen signal is read from the memory 51 by a read clock, inserted to the master screen signal by a slave screen insertion circuit 31 and outputted to a cathode ray tube 33.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a television receiver that displays another program as part of a television image that is being received, and is related to a so-called picture-in-picture television receiver.
This is called a Picture (hereinafter abbreviated as P in P).

(Conventional configuration and its problems) In recent years, pinP televisions have been announced.

The idea behind this method is shown below.

FIG. 1 is a conceptual diagram of P in P, in which A is a television receiver, B is a main screen section, and C is a small screen section into which another chimp screen has been reduced and inserted.

FIG. 2 is a circuit configuration diagram of a conventional example related to the present invention. 1 is an antenna, 11.21 is a tuner selection circuit for the main screen and a sub screen, respectively, 12.22 is a VI for the main screen and a sub screen, respectively, 13.
Reference numerals 23 denote video signal processing circuits for the main screen and for the sub-screen, respectively. The signal for the child screen is stored in the memory 51 using a synchronization signal obtained by the synchronization separation circuit 24 and a clock obtained by the write clock generation circuit 25. Furthermore,
Based on the reading clock, the child screen signal is read out from the memory 51, inserted into the main screen signal by the child screen insertion circuit 31, and output to the cathode ray tube 33. 14. , 15 are a synchronous separation circuit and a read clock generation circuit, respectively.

Such a television receiver requires a tuner/channel selection circuit 21 and a V/F/video detection circuit 22 dedicated to the sub-screen, resulting in high cost.

(Objective of the Invention) An object of the present invention is to provide a PinP television receiver configured to solve the above-mentioned problems and to improve its functions.

(Structure of the Invention) The present invention utilizes an external device such as a video tail recorder equipped with a cheese/tuning circuit, and a TV Noyon receiver is provided with an input terminal for a video signal output from the external device. A switch circuit is installed in front of each processing circuit for video signals input from the antenna and video signals input from external equipment to switch the respective video signals, which reduces costs and reduces costs.
It is possible to reduce and simultaneously display a TV program and a video signal from an external device, and conversely, it is also possible to reduce and display a TV program input from the antenna of the TV Noyon receiver.

(Explanation of Examples) Hereinafter, embodiments will be described in detail with reference to the drawings.

Fig. 3 shows an embodiment of the present invention, where ■ is an antenna, ] 1 is a tuner/tuning circuit, 12 is a VIP/video detection circuit, and 13 and 23 are for a main screen and a sub screen, respectively. This is a video signal processing circuit.

The signal d for the child screen is stored in the memory 51 using a synchronization signal obtained from the synchronization separation circuit 24 and a clock obtained from the write clock generation circuit 25 .

Furthermore, the small screen signal is sent to the memory 51 according to the reading clock.
The sub-screen insertion circuit 31 inserts the signal into the main screen signal and outputs it to the cathode ray tube 33. 14 and 15 are a synchronous separation circuit and a reading clock, respectively.

This is a generation circuit.

Reference numeral 71 is an external device different from the PinP television, and is a video output device that replaces the small screen cheese/channel selection circuit 21 and the VIP/video detection circuit 22 shown in FIG. 2 described in the conventional example. . In recent years, V
There are TR, video guides, etc., and VTR is the most popular among them.
It is widespread. Connect this VTR (with f--) to the video input of the PinP TV, i.e. 71 in Figure 3.
By connecting as a parent and child screen, you can watch separate programs on the parent and child screens, and all the problems of the conventional example can be easily solved. 61 and 62 are a mode changeover switch and a parent/child exchange switch, respectively. Details of both switches are shown in FIG. The drawing numbers correspond to those in FIG.

When the switches 61 and 62 in FIG. 4 are in the connection positions shown in the drawing, the main screen signal C
1. The video signal a that has passed through the VIP/video detection circuit 12 (
The small screen signal d is a video signal b (hereinafter referred to as a sub signal) from the external device 71. Therefore, on the cathode ray tube, as shown in FIG. 5(a), the main signal E is output as the parent screen, and the sub signal E is output as the sub screen. When the parent/child exchange switch 62 is switched to a different connection position than the one shown in the drawing, on the CRT,
As shown in FIG. 5(b), the sub signal E is used as the main screen.
However, the main signal is output as a child screen, which means that the main screen and child screen have been swapped. In this way, the switch 62
By configuring the main screen signal C and the sub-screen signal d to be exchanged, the program on the sub-screen that was being monitored can be viewed as the main screen.

If this parent-child switching switch and Chiro 2 are configured to be controlled by remote control, practical functional improvements can be easily achieved.

The relationship between the switch positions of the mode changeover switch 61 and the parent/child exchange switch 62 will be explained with reference to the output screen on the cathode ray tube in FIG. 6. At the connection positions of the switches 61 and 62 in FIG. 4, the main signal is output to the main screen and the sub signal E is output to the child screen, as shown in FIG. 6 (,). Also, if only the switch 61 is switched to a position other than the connection position shown in the drawing, the sixth
As shown in Figure (b), the main signal is output for both the parent and child screens.

When the connection position of only the switching switch and Ciro 2 is switched, the main screen and child screen are switched as described above.

(Effects of the Invention) As described above, the present invention eliminates the need to have a tuner/channel selection circuit and a VIP/video detection circuit for the sub screen independent of the main screen as in the conventional example, resulting in a significant increase in cost. As with the conventional example, other TV programs can be displayed in a reduced size on a part of the main screen. Furthermore, V
Signals from TRs, video desks, etc. can also be reduced and displayed easily. In addition, by providing a simple switch circuit configured to switch the signals for the main screen and sub-screen, the TV signal that has passed through the tuner and channel selection circuit for the main screen is reduced and projected, and at this time, the signal for the main screen and other screens is You can watch TV programs, VTR, video desk signals, etc.

[Brief explanation of drawings]

Figure 1 is a conceptual diagram of a PinP television receiver; Figure 2 is a conceptual diagram of a PinP television receiver;
The figure is a circuit block diagram of a conventional P in P television receiver, Figure 3 is a circuit block diagram of an embodiment of the present invention, and Figure 4 is a detailed diagram of switch blocks 61 and 62 in Figure 3. , FIG. 5 and FIG. 6 are diagrams showing the state of outputting a screen onto a cathode ray tube in the present invention. 1. Antenna, 11. Tuner/tuning circuit, 12-
・VIP/video detection circuit, 13.23 Video signal processing circuit, 14.24... Synchronization separation circuit, 15 ・Reading clock generation circuit, 25 Layer-inclusive black 7 generation circuit, 31 Small screen insertion circuit, 33. Braun tube, 51.
Memory, 61 Mode selection switch, 62...Parent/child switching switch, 71 External device. Patent Applicant: Matsushita Electric Industrial Co., Ltd. Agent: Kouji Hoshino, Ni, '- Figure 413 Figure 5 + O1 (b) Figure 6 fQ) (bl

Claims (1)

[Claims] A tuner/channel selection circuit and a VIP/video detection circuit for obtaining a first television signal, an input terminal for the obtained first television signal, and a terminal for connecting a second television signal source such as an external device. a changeover switch circuit that uses any one of the first and second television signals as a main screen signal and the other as a sub-screen signal; and the main screen signal and the sub-screen signal. a memory processing circuit that writes and stores the sub-screen signal that has undergone video signal processing and reads out the stored signal; and a memory processing circuit that processes the read out sub-screen signal that has undergone video signal processing. A television receiver characterized in that it is equipped with a signal insertion circuit that is inserted into a cathode ray tube, and simultaneously displays a small screen on a part of a main screen on a cathode ray tube.