JP3474763B2 - Two-screen TV receiver - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention divides a display area of a display to display two types of images on one display (displaying side by side or providing a small display area in a part of one image). The present invention relates to a two-screen television receiver that displays other images.

[0002]

2. Description of the Related Art In recent years, dual-screen television receivers have been widely used in television receivers mounted on vehicles. FIG. 3 is a block diagram showing the outline of a two-screen television receiving device. Reference numeral 31 is a television receiving antenna for receiving television radio waves. Reference numeral 32 denotes an antenna distributor, which distributes the radio waves received by the antenna 31 to the tuner unit 33 and the tuner unit 34. 33
The tuner section is composed of circuits for high-frequency amplification, tuning, frequency conversion, intermediate-frequency amplification, demodulation, etc., and selects a desired channel from the radio waves received by the antenna 31, and outputs an image and audio signal. A tuner unit 34 having the same configuration as the tuner unit 33 receives and outputs other desired channels. An image processing unit 35 performs image processing on the outputs of the tuner 33 and the tuner 34 and outputs the processed images. Reference numeral 36 denotes a television screen, that is, a display including a CRT or LCD. Then, when displaying the two screens, the image processing unit 3
5 is a tuner portion 33 on the left half surface of the display 36, for example.
The image output by the projector is projected, and the tuner section 34 is displayed on the right half surface.
Tuners 33, 34 so that the images output by
The signals from are combined and output to the display 36.

[0003]

Particularly in a TV apparatus mounted on a vehicle, a diversity type receiving method is desired in order to receive a good TV image with respect to an electric field which is constantly changing. However, a diversity reception system compatible with a two-screen TV has not been developed, and even if the image quality of one screen is good, the reception status of the other screens may be poor and it may be difficult to see the same display.

[0004]

In order to solve the above-mentioned problems, the present invention adopts a diversity reception type TV which selects an antenna having a good reception state from a plurality of antennas to receive a television broadcast and display an image on the display. A receiving device, which has a first receiving means and a second receiving means for receiving a television broadcast to be displayed, and displays images received by the first television receiving means and the second television receiving means in a single display. In a two-screen TV receiver having a screen division function of dividing a display area and displaying the same at the same time, a plurality of antennas and, when the screen is divided, reception from the plurality of antennas other than the antenna connected to the second receiving means. First selection means for selecting an antenna in good condition and connecting it to the first reception means, and an antenna other than the antenna connected to the first reception means when the screen is divided. Second connecting selected good antenna reception state from the plurality of antennas to the second receiving means
And a selection means.

Also, in a diversity receiving type TV receiving apparatus for selecting an antenna having a good reception state from a plurality of antennas to receive a television broadcast and display an image on a display, a first receiving means for receiving the television broadcast. And a second receiving means, and a two-screen TV reception having a screen division function of displaying the images received by the first television receiving means and the second television receiving means at the same time by dividing the display area of one display. In the device, the first consisting of a plurality of antennas
An antenna group, a second antenna group including a plurality of antennas other than the first antenna group, and the first antenna when the screen is divided.
Third selecting means for selecting an antenna in a good receiving state from the antenna group and connecting to the first receiving means, and selecting an antenna in a good receiving state from the second antenna group for dividing the screen into the second And a fourth selecting means connected to the receiving means.

[0006]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a diagram showing the configuration of a dual-screen television receiver according to an embodiment of the present invention. 1, 2, 3, and 4 are TV receiving antennas for diversity reception, which are installed at positions as far apart as possible from the vehicle body (roof) of the vehicle to which the vehicle-mounted TV receiving device is installed (four in this example). ). Reference numeral 5 denotes an antenna changeover switch for selecting an antenna from the four antennas 1, 2, 3, 4 and connecting it to the tuner section 6 and the tuner section 7. The antenna changeover switch is composed of a switching circuit including relays, transistors, etc. The switching state is controlled by an instruction signal from 10. 6,
Reference numeral 7 denotes a TV tuner section which is composed of a circuit for performing high frequency amplification, tuning, frequency conversion, demodulation, etc., and receives a TV broadcast and outputs a video signal and an audio signal. The tuner units 6 and 7 also output a signal indicating the reception state, which is an electric field strength signal (rectification of the output of the detection circuit, a smoothed signal, etc.),
Noise level signal (rectification of high-bandwidth signal of detection circuit output,
Smoothed signal etc.) is used.

An image processing unit 8 processes the image signals output from the tuner units 6 and 7 to form an image to be displayed on the display 9, and includes an image data storage memory and an image processing digital signal processor. The signal for display (composite signal or RG
B signal) is output. Reference numeral 9 denotes a display for displaying an image, which is composed of a CRT, LCD or the like. Reference numeral 10 denotes an antenna control unit that controls overall operations of the television receiving apparatus such as diversity operation. The antenna control unit 10 is configured by a microcomputer and determines the receiving state from the signals output from the tuner units 6 and 7 to determine the antenna 1 2, 3,
An antenna with a good reception state is selected from the four. That is, the reception frequencies of the tuner units 6 and 7 are switched and the image processing contents of the image processing unit 8 are controlled according to the diversity operation control and the operation contents of the operation switch 11. 11 is
An operation switch for operating the television receiver, for example, an operation switch for manually instructing the operator about the desired channel to receive, the image display, or the method of diversity operation. To be done.

Next, the processing operation of the microcomputer 10 will be described with reference to the flowchart of FIG. FIG. 3 shows the processing of the microcomputer 10. In this example, a case where four antennas are installed will be described. This process is repeatedly executed during the operation of the present dual-screen television receiving device (when the power is turned on). In step S1, the screen displayed on the display 9 is divided into two screens, or
Whether to display as a screen is determined, and if two screens are to be displayed, the process proceeds to step S2, and if the screen is not split and is to be displayed on one screen, the process proceeds to step S13. In step S13, the reception frequencies of the tuners 6 and 7 are both set to those of the broadcasting station designated by the operator, and different antennas 1 to 4 are connected to the tuners 6 and 7. Then, compare the reception status,
The image output by the tuner section with the better reception state is displayed on the display 9, and the antenna to be connected is switched for the tuner section with the poor reception state (antenna not connected to the tuner section with the better reception state). Then, the receiving states of these antennas are compared, and the switching process of the image (tuner unit) displayed on the display 9 is repeated. That is, a general 2-tuner diversity system is performed.

In step S2, a two-diver system is used in which an antenna is assigned to each tuner unit 6 and 7 (a diver system in which each tuner unit 6 and 7 uses two different antennas), or the other tuner unit is used. It is determined which one of the three-diver method that selects an antenna with a good reception state from the three unconnected antennas. This judgment is made based on the operation state of the operation switch 11 by the operator. Then, in the case of the two-diver system, the process proceeds to step S3, and in the case of the three-diver system, the process proceeds to step S14. In step S3, it is determined whether or not the reception condition of the first tuner tu1 (tuner unit 6) is deteriorated, and if not, the process proceeds to step S8.

In step S4, 1 is added to n indicating the antenna number connected to the first tuner tu1 and step S4 is performed.
Go to 5. In step S5, it is determined whether n is 3, and if n = 3, the process proceeds to step S6, and if n is not 3, the process proceeds to step S7. Therefore, n is 1
Or it will be 2. In step S6, n is returned to 1 and it moves to step S7. In step S7, the antenna n (antenna with antenna number n; corresponding to antennas 1 to 4 in FIG. 1) is connected to the first tuner tu1 and the process proceeds to step S8. In step S8, the second tuner tu2 (tuner unit 7)
It is determined whether or not the reception state has deteriorated. If it is determined that the reception state has deteriorated, the process proceeds to step S9, and if not deteriorated, this process is completed.

At step S9, 1 is added to the antenna number m connected to the second tuner tu2, and the process proceeds to step S10. In step S10, it is detected whether m is 5, and if m = 5, the process proceeds to step S11, and if not m = 5, the process proceeds to step S12. In step S11, m is 3
Then, the process proceeds to step S12. Therefore, m becomes 3 or 4 alternately. In step S12, the antenna m is connected to the second tuner tu2, and this processing is completed.

In step S14, the first tuner tu1
It is determined whether or not the reception state of is deteriorated. If it is deteriorated, the process proceeds to step S15, and if not, the process proceeds to step S20. In step S15, 1 is added to n and the process proceeds to step S16. In step S16, it is determined whether n is 5, and if it is 5, the process proceeds to step S17, and if it is not 5, the process proceeds to step S18. In step S17, n is set to 1 and the process proceeds to step S18.
In step S18, it is determined whether n is equal to m, that is, whether the antenna n is the same as the antenna m connected to the second tuner tu2. If n = m, the process returns to step S15, and n = m. Otherwise, step S19
Move on to. In step S19, the antenna n is connected to the first tuner tu1 and the process proceeds to step S20. That is, if the reception condition of the first tuner tu1 deteriorates, the antennas other than the antennas connected to the first tuner tu1 and the second tuner tu2 are switched as the antenna of the first tuner tu1.

In step S20, the second tuner tu2
It is determined whether or not the reception state of has deteriorated, and if it has deteriorated, the process is completed in step S21. In step S21, 1 is added to m and step S2
Move to 2. In step S22, it is determined whether m is 5, and if it is 5, the process proceeds to step S23, and if it is not 5, the process proceeds to step S24. Step S2
In 3, m is returned to 1, and the process proceeds to step S24.

In step S24, it is determined whether m is equal to n, that is, whether the antenna m is the same as the antenna n connected to the first tuner tu1, and if m = n, the process returns to step S21, If m = n is not satisfied, the process proceeds to step S25. In step S25, the second tuner tu
The antenna m is connected to 2 to complete this processing. According to the above processing, if the two-diver method is selected in the two-screen display state, the antenna 1 is
An antenna having a good reception state is connected to the tuner 2 and an antenna having a good reception state is connected to the tuner 7 from the antennas 3 and 4. Further, in the two-screen display state, if the three-divers method is selected, the tuner unit 6 and the tuner unit 7 are connected to the antennas having a good reception state from the antennas not connected to the other tuner unit. Further, in the one-screen display state, an image is displayed based on the broadcast wave received by the antenna having a good reception state among the four antennas 1 to 4.

Although the four antennas are divided into two groups of two and used for diversity operation, it is also possible to divide into two groups with other numbers, and the number of antennas of each group is different. It is also possible to do so.

[0016]

As described above in detail, according to the present invention, in the two-screen television receiver, the antenna switching in the diversity operation can be appropriately and efficiently performed to improve the quality of the received screen. Is possible.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing a dual-screen television receiver according to an embodiment of the present invention.

FIG. 2 is a flowchart showing processing performed by the microcomputer 10.

FIG. 3 is a schematic configuration diagram of a conventional two-screen television receiving device.

[Explanation of symbols]

1, 2, 3, 4, ... Antenna 5 ... Antenna switching switch 6, 7 ... Tuner section 8 ... Image processing unit 9 ... Display 10 ... Microcomputer 11 ... Operation SW

─────────────────────────────────────────────────── ─── Continuation of front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) H04N 5/44-5/45 H04B 7/08 B60R 1/00

Claims (2)

(57) [Claims] 1. An antenna having a good reception condition from a plurality of antennas.
Select the antenna to receive the TV broadcast and display it on the display.
In the TV receiver of the diversity reception system that displays the image
A first receiving means and a second receiving means for receiving the television broadcast to be displayed, and the first television receiving means and the second receiving means.
It has a screen division function to divide the display area of one display into the image received by the television receiving means at the same time.
In the two-screen TV receiving device according to the first aspect of the invention, a plurality of antennas and an antenna in a good reception state are selected from the plurality of antennas other than the antenna connected to the second receiving means when the screen is divided . First selecting means connected to the receiving means, and an antenna in a good reception state is selected from the plurality of antennas other than the antennas connected to the first receiving means at the time of screen division and connected to the second receiving means. A dual-screen television receiving device comprising: 2. An antenna with good reception condition from a plurality of antennas.
Select the antenna to receive the TV broadcast and display it on the display.
In the TV receiver of the diversity reception system that displays the image
There are, and a first receiving means and second receiving means for receiving a television broadcast, said first television receiver means and said second television receiver unit display area of one Deisupurei image receiving <br / In a two-screen TV receiver having a screen division function of dividing> and displaying simultaneously, a first antenna group including a plurality of antennas and a second antenna including a plurality of antennas other than the first antenna group.
An antenna group and a third antenna for selecting a good reception state antenna from the first antenna group when the screen is divided and connecting to the first receiving means.
A fourth means for selecting an antenna in a good reception state from the second antenna group and connecting to the second receiving means when the screen is divided .
A two-screen television receiving device comprising: a selecting unit.