KR0180677B1 - Apparatus and method for automatically selecting the biased wave of a satellite broadcasting receiver - Google Patents

Abstract

The present invention relates to a satellite broadcast receiving system, and in particular, a polarized wave automatic selection apparatus and method for automatically converting a driving part of a fora rotor mounted on a parabolic antenna by distinguishing received radio waves into horizontal polarization or vertical polarization. It is about. The system amplifies the signal received by the probe of the fora rotor in the LNB and converts the signal to a low frequency. In response to this signal, the tuner outputs an AGC output signal having an inverse intensity. At this time, the output signal of the sent AGC is converted into a digital signal by the A / D converter, and then transmitted to the control unit, which is compared with the output signal of the previous AGC and sent to the drive unit. According to the signal sent, the driver generates a pulse to control the probe and sends the pulse to the fora rotor, and the probe moves its position according to the signal. This system can be conveniently used by adjusting the position of the probe automatically.

Description

Automatic polarization selection device and method of satellite broadcasting receiver

1 is an overall configuration diagram of a general satellite broadcasting receiver.

2A and 2B are probe state diagrams at the time of horizontal / vertical polarization reception.

3 is a block diagram of a satellite broadcast receiver for automatically controlling a probe according to the present invention.

4 is a pulse driving circuit diagram constituting a part of the driving unit of the third diagram.

5 is a waveform diagram illustrating an example of a PWM control signal oscillated by a controller.

6 is an AGC characteristic diagram of a satellite broadcast receiver.

7 is a flowchart illustrating a control process of the present invention.

* Explanation of symbols for main parts of the drawings

10: broadcast satellite 20: parabolic antenna

21: Fora Rotor 22: LNB

23: Feedhorn 24: Probe

30: satellite broadcasting receiver 40: TV

31: tuner 32: video processing unit

33: audio processor 34: RF modulator

35: A / D converter 36: control unit

37: drive portion 38: key operation portion

50: input terminal 60: output terminal

The present invention relates to a satellite broadcast receiving system, and in particular, a polarized wave of a satellite broadcast receiver for automatically converting a probe, which is a driving part of a fora rotor mounted on a parabolic antenna, by distinguishing a received radio wave into a horizontal polarization or a vertical polarization. An automatic selection apparatus and method.

In general, satellite broadcasting transmits a radio wave divided into a vertical polarization or a horizontal polarization in order to reduce mutual interference between adjacent channels. In other words, if one channel is vertically polarized, the two channels are transmitted by being classified as horizontal polarization. This transmitted radio wave is reflected from the parabolic antenna and input into the feed horn of the LNB. The input signal is amplified and frequency converted in the LNB and transmitted to the satellite broadcasting receiver. At this time, the transmitted signal is reproduced through a TV through a satellite broadcast receiver. In particular, it is necessary to match the angle of the probe with the polarization plane of the radio wave transmitted from the satellite to obtain a good output. At this time, the angle of the probe is manually adjusted by using the vertical / horizontal switching function of the satellite receiver while the user watches TV. Such a system was cumbersome by manually adjusting the angle of the probe each time the channel was changed.

Accordingly, it is an object of the present invention to provide an apparatus and method for automatically selecting a polarization of a satellite broadcast receiver which detects an output signal of an AGC indicating an input signal state of a broadcast receiver and automatically adjusts an angle of a probe so as to automatically obtain a best reception state.

Polarization automatic selection device of the satellite broadcast receiver according to the present invention for achieving the above object is an automatic gain control device having an intensity inversely proportional to the output signal of the LNB that amplifies and frequency-converts the signal picked up to the probe (Automatic And a tuner for generating an output signal of Gain Control (hereinafter referred to as AGC). And a control unit for outputting a control signal for controlling the probe by comparing the output signal of the AGC transmitted from the tuner with a signal value stored in a register. And a driving unit generating a driving signal for controlling the angle of the probe according to the control signal of the controller and applying the driving signal to the probe.

In order to achieve the above object, the polarization automatic selection method of the satellite broadcasting apparatus according to the present invention includes the step of adjusting the first automatic gain adjustment value of the satellite broadcasting signal received at the initial position of the probe. And rotating the position of the probe by a predetermined value in an arbitrary direction. And comparing the second automatic gain adjustment value and the first automatic gain adjustment value of the satellite broadcast signal received at the moving position of the probe. And adjusting the position of the probe to the optimum position according to the comparison value of the comparing step.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a schematic overall configuration of a satellite broadcasting receiver. As shown, the radio wave transmitted from the broadcast satellite 10 is received by the parabolic antenna 20. This signal is connected to the probe of the fora rotor 21 attached to the parabolic antenna 20. The signal connected to the probe is amplified by a low noise amplification and low noise block (LNB) 22 and converted to a low frequency of 1 GHz. The converted signal is transmitted to the satellite broadcasting receiver 30, and a specific signal is selected from the transmitted signals, processed, and then transmitted to the TV 40 for viewing.

On the other hand, if the signal transmitted from the broadcast satellite 10 and the polarization plane of the probe is the same, the radio wave can be received to the maximum. If the polarization plane is different, the signal does not belong properly, the reception state is poor. FIG. 2 shows the state of the probe at the time of vertical / horizontal polarization, and FIG. 2a shows the position of the probe at the time of horizontal polarization reception, and the position at the time of horizontal polarization reception at FIG. 2b. As shown, the probe 24 located inside the feed horn 23 is moved in position by changing its angle according to the polarization plane of transmitted radio waves.

3 is a block diagram of a satellite broadcasting receiver to which the apparatus is applied. Dotted lines shown here represent the core of the present invention. As shown, the signal output from the LNB of the above-described antenna is transmitted to the tuner 31, and the tuner 31 receives this signal and tunes a specific signal to a base band signal. The converted signal is transmitted to the video processor 32 and the audio processor 33. At this time, the video processor 32 processes the transmitted signal to output a video signal, and the audio processor 33 processes and outputs the transmitted signal as an audio signal. In addition, the signal output from the video processor 32 and the audio processor 33 is applied to the RF modulator 34 is output as a composite signal.

On the other hand, the tuner 31 is provided with an automatic gain control device (AGC), and the AGC generates an output signal inversely proportional to the signal strength input from the LNB. The output signal of the AGC generated in this way is transmitted to the A / D converter 35 is converted into a digital signal and transmitted to the control unit 36.

The control unit 36 receives the digitized signal and compares it with the output signal of the previous AGC. The compared data is sent to the driver 36, converted into pulse signals for controlling the angle of the probe 24 of the fora rotor 21, and sent to the fora rotor 21. This part will be described in detail with reference to FIG. The control unit 36 also receives an input from the key operation unit 39 and sends control signals to the video processing unit 32, the audio processing unit 33, and the tuner 31.

FIG. 4 shows the pulse generating circuit of the driving section of the apparatus of FIG. As shown, the PWM signal sent from the controller 36 is applied to the input terminal 50. At this time, when the PWM signal is high, the transistor Q1 is turned on and no voltage is output to the output terminal 50. On the other hand, when the PWM signal applied to the input terminal 50 is low, the transistor Q1 is turned off and a voltage of 6V is output to the output terminal. An example of the above-described PWM signal is shown in FIG.

5 shows an example of a PWM control signal. As shown, the pulse width is modulated along the time axis to produce a signal that controls the probe. The large and small pulse widths shown here determine the rotation direction of the angle of the probe according to the data set in the memory of the controller. In other words, if it is set clockwise when the pulse width is small and counterclockwise when the pulse width is large, the probe operates accordingly. When such a PWM signal is applied to the pulse generating circuit shown in FIG. 4, a driving pulse for driving the probe clockwise or counterclockwise is generated.

FIG. 6 is an AGC characteristic diagram of a satellite broadcasting receiver. When the RF input value is increased, the output voltage of AGC, which is an AGC output signal, decreases. When RF is input to the AGC of the above-described tuner, an output voltage of AGC inversely proportional thereto is generated and output. The control unit determines the reception state of the probe according to this output signal. That is, the controller determines that the RF input is increased when the output signal of the AGC is small.

Now, the control method of the present invention will be described in detail with reference to the flowchart of FIG.

The AGC output signal generated by the tuner is converted into a digital signal by the A / D converter and input to the controller. This automatic gain control value of the first AGC inputted is stored in a register (for convenience of explanation, the value stored in the register is set to A1). (Step 100) Then, the probe angle of the fora rotor is set by a certain amount A2 in a specific direction. (Step 101) After the movement, the output signal of the AGC generated according to the detection is detected as the current input value. If the current input value is smaller than or equal to A1, the current value is stored in A1 and moved by A2 in the same direction. (Steps 102, 103, 104) In particular, such a loop continues to run until the current value is greater than A1. On the other hand, if the current input value is larger than A1, the fora rotor is moved by A2 in the opposite direction to detect the AGC output signal as the current input value and compared with A1 (step 102, 105, 106). If it is less than or equal to A1, the current value is stored in A1 and the fora rotor is moved by A2 in the same direction (steps 107, 108). Then, the AGC auto gain adjustment value is detected, set as the current value, and compared with A1 again. Step 106) If the compared value is small, the previous process is repeated until large. On the other hand, when the compared value is increased, the probe is moved by A2 in the opposite direction to fix the position of the probe and complete the adjustment (steps 105, 109, 110).

As described above, the polarization automatic selection apparatus and method of the satellite broadcast receiver according to the present invention detects the AGC output terminal of the satellite broadcast receiver and automatically adjusts the angle of the probe to achieve the best output state, which is annoying when the device is operated. Excludes the roam has a convenient effect.

Claims (7)

A satellite broadcasting receiver for displaying a satellite broadcast signal received through a probe of an antenna, comprising: means for receiving and detecting an output signal of an LNB for amplifying and frequency converting a signal picked up by the probe, and detecting and outputting the detected signal; A tuner having an automatic gain control unit for generating and outputting an automatic gain control (AGC) signal in inverse proportion to an output level of the automatic gain control (AGC) signal for adjusting the gain of the detected signal; A control unit which emits a control signal for controlling the probe based on a result of comparing the AGC signal supplied from the automatic gain control unit of the tuner with a previous AGC signal value; And And a driving means for controlling the rotation angle of the probe according to a control signal of the controller. The polarization automatic selection apparatus of claim 1, further comprising an A / D converter for converting the AGC signal from the automatic gain control unit into a digital signal and transmitting the digital signal to the control unit. The polarization selection device of a satellite broadcast receiver as claimed in claim 1, wherein the control unit generates a pulse width modulated signal. It receives and outputs the output signal of the LNB that amplifies and frequency-converts the satellite broadcast signal picked up by the probe of the antenna, and outputs the tuner. The tuner generates an automatic gain control (AGC) signal of the automatic gain control device having an inverse proportion thereto. In one satellite broadcast receiving apparatus, a method for selecting polarization through the probe, the first automatic gain control value of the automatic gain control signal for adjusting the gain of the satellite broadcast signal received at the initial position of the probe. Storing as a first step; A second step of rotating the position of the probe by a predetermined value in an arbitrary direction; A third step of comparing a second automatic gain adjustment value for adjusting a gain of a satellite broadcast signal received at a moving position of the probe driven to rotate in the second step with the stored first automatic gain adjustment value; And a fourth step of adjusting the position of the probe to an optimal position based on the comparison result of the third step, wherein the fourth step includes the second automatic gain adjustment value smaller than the first automatic gain adjustment value. Or 4-4, storing a second automatic gain adjustment value and rotating the probe by a preset value in the same direction as the arbitrary direction if it is equal to or equal to the second automatic gain adjustment value; And the fourth step stores the second automatic gain adjustment value when the second automatic gain adjustment value is greater than the first automatic gain adjustment value and rotates the probe by a preset value in a direction opposite to the arbitrary direction. Polarization selection method of a satellite broadcast receiver comprising the step 4-2. The polarization selection method of claim 4, wherein the AGC signal has a property inversely proportional to an RF input. The method of claim 4, wherein the step 4-2 is a comparison between the third automatic gain adjustment value and the second automatic gain adjustment value for controlling the gain of the satellite broadcast signal received at the opposite position of the probe. Polarization selection method of the satellite broadcast receiver, characterized in that it further comprises a step 4-3. The method of claim 6, wherein when the third automatic gain adjustment value is less than or equal to the second automatic gain adjustment value, the third automatic gain adjustment value is stored and the probe is equal to the opposite direction. 4-4 step of rotationally driving by a predetermined value in the direction; And when the third automatic gain adjustment value is larger than the second automatic gain adjustment value, rotationally driving the probe by a preset value in a direction opposite to the opposite direction, and then turning the rotationally driven probe position to an optimal position of the probe. Polarization selection method of the satellite broadcast receiver, characterized in that it further comprises a step 4-5.