JPH06104785A - Satellite broadcast receiver - Google Patents

Abstract

PURPOSE:To easily attain the adjustment of the switching position of a polarizer by moving a cursor according to the variation of the switching position of a polarization plane by a signal from a control part, and on-screen displaying the switching position of the polarizer. CONSTITUTION:A polarization plane switching signal set at a polarization plane control circuit 4 is changed by a control signal from a control part 2 according to the input of the adjusting signal of the polarizer switching position to the control part 2, and the polarization plane switching position is changed. And also, a scale display for displaying the polarizer switching position is outputted from a character generator 7, a cursor display for indicating the switching position is generated from a cursor signal generating part 8, and the on-screen display is operated on a display screen based on those outputs. Then, the present polarizer switching position is displayed by the operation of an inputting part 1, the switching position display is moved to an anti-clockwise direction or a clockwise direction, and an optimal point is recognized. The scale display and the cursor display for indicating polarizer switching position can be on-screen displayed, so that the adjustment of the polarizer switching position can be easily attained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a satellite broadcast receiver, and more particularly to a satellite broadcast receiver having a built-in antenna positioner for controlling a receiving antenna.

[0002]

2. Description of the Related Art Conventionally, an antenna positioner and a satellite broadcast receiver are used, and the antenna positioner directs the direction of the antenna toward the receiving satellite, and further switches the polarizer in the feed horn provided in the antenna part. The polarized wave desired to be received is selected, converted into the first intermediate frequency signal by the LNB, input to the satellite broadcast receiver, and the satellite broadcast signal is received. Since the antenna is oriented in the direction of the receiving satellite, the angle of horizontal polarization or vertical polarization introduced into the feed horn varies for each satellite, and may change due to variations in the mounting of the antenna or feed horn. The switching position of the polarizer has been adjusted so that the horizontally polarized wave or the vertically polarized wave can be efficiently received.

[0003]

However, when adjusting the switching position of the polarizer, there is a problem that the adjustment is time-consuming because there is no indication of a scale or the like.
An object of the present invention is to make it possible to display the switching position of the polarizer on-screen so as to facilitate adjustment of the switching position of the polarizer.

[0004]

FIG. 1 is a block diagram of a main part of a satellite broadcast receiver showing an embodiment of the present invention. As shown in FIG. A control unit 2 for outputting a control signal in accordance with an operation signal input from the unit 1, a polarization plane switching circuit 4 for outputting a polarization plane switching signal to a polarizer provided in the feed horn by the control signal, Character generator 7 which outputs a display signal for displaying a scale by a control signal
A display signal generation unit 10 including a cursor signal generation unit 8 for displaying a cursor on the same scale and a storage unit 3 for storing the display position of the cursor are provided, and the control unit 2 is adjusted for the switching position of the polarizer. When a signal is input, the polarization plane switching signal set in the polarization plane switching circuit 4 is changed by the control signal from the control unit 2 to change the polarization plane switching position and the cursor is moved according to the change amount. A display signal to be moved on the scale is output from the display signal generation unit 10, and on-screen display can be performed based on the output.

[0005]

FIG. 2 is an explanatory view showing a display example of the on-screen display according to the present invention. When an adjusting signal of the switching position of the polarizer is input to the control unit 2, the polarization plane is changed by the control signal from the control unit 2. By changing the polarization plane switching signal set in the switching circuit 4 to change the polarization plane switching position, a scale from CCW (counterclockwise) to CW (clockwise) for displaying the switching position of the polarizer from the character generator 7 is displayed. The display is output, and a cursor signal indicating the switching position of the polarizer is generated and output by the cursor signal generation unit 8, and on-screen display is performed on the screen of a television or the like based on the both outputs, and the input unit 1 is operated. For example, if the best position is found by moving the current polarizer switching position display in the counterclockwise direction, and there is no best point in the counterclockwise direction,
The best point can be found by moving it clockwise, and the scale display that shows the switching position of the polarizer and the cursor display that shows the switching position of the polarizer can be displayed on-screen. The switching position can be easily adjusted.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a block diagram of an essential electric circuit of a satellite broadcast receiver showing an embodiment of the present invention. Reference numeral 1 denotes an input unit, which allows an operation signal to be input to the control unit 2 by using, for example, a remote controller or an operation unit provided in the satellite broadcast receiver. As the control unit 2, for example, a microcomputer is used. The control signal can be output according to the input operation signal. Reference numeral 4 denotes a polarization plane switching circuit, which outputs a polarization plane switching signal to a polarizer provided in the feed horn according to a control signal input from the control unit 2. As a polarizer, for example, using a rotary polarizer, for the radio waves introduced to the feed horn,
The coupling probe is rotated by a motor to select the horizontal polarization or the vertical polarization introduced into the feed horn and combine it with the same probe so that satellite broadcast signals can be picked up and output from the polarization plane switching circuit 4. A pulse signal is used as the switching signal of the polarizer, and the probe width is rotated by setting different values for the pulse width of the pulse signal when horizontal polarization is selected and when vertical polarization is selected. The motor to be controlled is controlled so that the polarized wave to be coupled to the probe can be selected. Further, the switching position for the horizontal polarization and the vertical polarization of the probe can be adjusted by finely adjusting the pulse width of the pulse signal. When the plane of polarization of the signal is shifted, the pulse width of the pulse signal is finely adjusted to adjust the switching position of the probe so that the radio waves can be efficiently coupled.

Reference numeral 10 is a display signal generator, which is composed of a character generator 7, a cursor signal generator 8, and a synthesizing circuit 9 for synthesizing the output from the character generator 7 and the output from the cursor signal generator 8. The display signal output from the circuit 9 is input to a video signal circuit such as a television so that the display signal can be displayed on the television screen on-screen. Reference numeral 12 denotes a channel setting unit, which inputs a polarization selection signal to the control unit 2 by operating the input unit 1 to determine whether to receive the channel number and horizontal polarization or vertical polarization. Enables the channel setting unit 12 to set the reception channel and the polarization to be selected.
Therefore, when the input section 1 is operated to specify the reception channel number of the satellite broadcast, the control section 2 refers to the data set in the channel setting section 12 and outputs a horizontal polarization or vertical polarization selection signal. The signal is input to the polarization plane switching circuit 4, and the polarization plane switching circuit 4 switches the polarizer provided in the feed horn to couple the satellite broadcast signal desired to be received to the probe.

Reference numeral 5 denotes a tuner unit, which converts the satellite broadcast signal coupled to the probe into a first intermediate frequency signal by LNB, inputs the first intermediate frequency signal into the tuner unit 5, and inputs it into the tuner unit 5. Select the selected first intermediate frequency band,
The signal is converted into a second intermediate frequency corresponding to the channel to be received and output, and is input to each signal processing circuit to demodulate the satellite broadcast signal. C in the output circuit from the tuner unit 5
An N ratio detection circuit 6 is provided, the ratio of signal power to noise power (CN ratio) is detected by the CN ratio detection circuit 6, and is input to the control unit 2. The control unit 2 displays the display code according to the input. The signal is output and input to the character generator 7, the display signal is output by the character generator 7, and the input signal is input to a video signal circuit such as a television via the synthesizing circuit 9 to display the display signal on-screen on the television screen. I am able to do it. Alternatively, the display unit 11 is provided, the display code signal output from the control unit 2 is input to the display unit 11, the display code signal is converted into the display signal on the display unit 11, and the CN ratio is used by an LED or the like. Then, it may be displayed as a digital display or a bar display.

When the position of the horizontal polarization or the vertical polarization set in the polarizer is deviated from the polarization plane of the horizontal polarization or the vertical polarization introduced into the feed horn, the CN ratio displayed on the screen is And the reception condition of satellite broadcasting deteriorates. In this case, the input unit 1 is operated to input an adjusting signal of the switching position of the polarizer to the control unit 2, and the control signal from the control unit 2 is input to the character generator 7 and the cursor signal generating unit 8 to set the character generator. 7
A scale display signal for displaying the switching position of the polarizer as shown in FIG. 2 is output. The control unit 2 is provided with a storage unit 3 for storing the current switching position of the polarizer as data, and the control unit 2 reads the data and inputs it to the cursor signal generation unit 8 and the cursor signal generation unit 8 Then, a cursor display signal indicating the switching position of the polarizer as shown in FIG. 2 is output.

When the position of the cursor display is moved by operating the input unit 1, the pulse width of the pulse signal to be output is changed by the control signal input from the control unit 2 in the polarization plane switching circuit 4 by the movement amount of the cursor display. The positions of the horizontal polarization and the vertical polarization set in the polarizer can be adjusted according to the above. Whether or not the adjustment is in the best state can be determined by, for example, looking at the CN ratio displayed on the screen. Further, after the adjustment is completed, the control unit 2 updates the data stored in the storage unit 3 and newly stores the data by using the switching position set in the polarizer as the data. The positions of horizontal polarization and vertical polarization set in the polarizer are orthogonal to each other.If one is adjusted to match one polarization plane of the introduced radio wave, the other automatically Therefore, the cursor can be displayed based on the position of either the horizontal polarization or the vertical polarization set in the polarizer, and the adjustment can be made either in the horizontal polarization or in the vertical polarization. You can make adjustments on either side of the wave.

[0011]

As described above, according to the present invention,
The scale display that shows the switching position of the polarizer and the cursor display that shows the switching position of the polarizer can be displayed on-screen, which allows you to adjust the switching position of the polarizer while watching the scale display. Since it is possible to display on-screen, it is possible to judge the suitability of adjusting the switching position of the polarizer,
It is possible to provide a satellite broadcast receiver that facilitates the adjustment of the switching position of the polarizer.

[Brief description of drawings]

FIG. 1 is a block diagram of an electric circuit of a main part of a satellite broadcast receiver, showing an embodiment of the present invention.

FIG. 2 is an explanatory diagram showing a display example of on-screen display according to the present invention.

[Explanation of symbols]

 1 Input Section 2 Control Section 3 Storage Section 4 Polarization Plane Switching Circuit 5 Tuner Section 6 CN Ratio Detection Circuit 7 Character Generator Circuit 8 Cursor Generation Section 9 Synthesis Section 10 Display Signal Generation Section 11 Display Section 12 Channel Setting Section

Claims (3)

[Claims] 1. In a satellite broadcast receiver, a control unit that outputs a control signal in response to an operation signal input from an input unit and a polarization plane switching signal for a polarizer provided in a feed horn by the control signal are provided. A polarization signal switching circuit for outputting, a display signal generating section comprising a character generator for outputting a display signal for displaying a scale by the control signal and a cursor signal generating section for displaying a cursor on the same scale, and a display position of the cursor When a signal for adjusting the switching position of the polarizer is input to the control unit by providing a storage unit for storing, the control signal from the control unit changes the polarization plane switching signal set in the polarization plane switching circuit. Then, the display position is changed and the display signal for moving the cursor on the scale according to the amount of change is displayed from the display signal generator. A satellite broadcast receiver characterized by outputting and on-screen display based on the output. 2. In the satellite broadcast receiver, a CN ratio detection circuit is provided in an output circuit from a tuner unit for converting into a second intermediate frequency signal corresponding to a reception channel, and a detection signal from the CN ratio detection circuit is provided. To the control unit, the control unit outputs a display code signal corresponding to the input and inputs the code signal to the character generator, the character generator outputs a display signal, and on-screen display is performed based on the output. The satellite broadcast receiver according to claim 1, wherein: 3. The control unit is provided with a channel setting unit, and by operating the input unit, it is possible to set the polarization to be selected for each reception channel in the channel setting unit via the control unit. The satellite broadcast receiver according to claim 1, which is characterized in that.