KR20120007350A - Satellite receiver for strong electric field and control method thereof - Google Patents

Satellite receiver for strong electric field and control method thereof Download PDF

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Publication number
KR20120007350A
KR20120007350A KR1020100068071A KR20100068071A KR20120007350A KR 20120007350 A KR20120007350 A KR 20120007350A KR 1020100068071 A KR1020100068071 A KR 1020100068071A KR 20100068071 A KR20100068071 A KR 20100068071A KR 20120007350 A KR20120007350 A KR 20120007350A
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KR
South Korea
Prior art keywords
low noise
noise amplifier
demodulator
electric field
intensity level
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KR1020100068071A
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Korean (ko)
Inventor
이재순
Original Assignee
삼성전기주식회사
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Priority to KR1020100068071A priority Critical patent/KR20120007350A/en
Publication of KR20120007350A publication Critical patent/KR20120007350A/en

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B17/00—Monitoring; Testing
    • H04B17/30—Monitoring; Testing of propagation channels
    • H04B17/309—Measuring or estimating channel quality parameters
    • H04B17/318—Received signal strength
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04H—BROADCAST COMMUNICATION
    • H04H40/00—Arrangements specially adapted for receiving broadcast information
    • H04H40/18—Arrangements characterised by circuits or components specially adapted for receiving
    • H04H40/27—Arrangements characterised by circuits or components specially adapted for receiving specially adapted for broadcast systems covered by groups H04H20/53 - H04H20/95
    • H04H40/90—Arrangements characterised by circuits or components specially adapted for receiving specially adapted for broadcast systems covered by groups H04H20/53 - H04H20/95 specially adapted for satellite broadcast receiving
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/44—Receiver circuitry for the reception of television signals according to analogue transmission standards
    • H04N5/455—Demodulation-circuits
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/44—Receiver circuitry for the reception of television signals according to analogue transmission standards
    • H04N5/50—Tuning indicators; Automatic tuning control
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F2200/00—Indexing scheme relating to amplifiers
    • H03F2200/294—Indexing scheme relating to amplifiers the amplifier being a low noise amplifier [LNA]

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • Multimedia (AREA)
  • Astronomy & Astrophysics (AREA)
  • General Physics & Mathematics (AREA)
  • Quality & Reliability (AREA)
  • Electromagnetism (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Circuits Of Receivers In General (AREA)

Abstract

PURPOSE: A satellite broadcasting receiving device with a complemented part of strong electric field and a control method thereof are provided to attenuate signals in off state of LNA(Low Noise Amplifier) while inputting a strong electric field signal. CONSTITUTION: An LNA(120) attenuates a satellite broadcasting signal in off state. A demodulator(140) demodulates baseband frequency signals. When an intensity level of the satellite broadcasting signal is higher than a threshold value of strong electric field, the demodulator generates a LNA off controlling signal. A switch control circuit(150) switches off the LNA in an input of the LNA off controlling signal .

Description

Satellite receiver and its control method complementing strong electric field

The present invention relates to a satellite broadcasting receiver and a method of controlling the same, which complements the strong electric field.

In general, a satellite wave tuner selects only a specific channel frequency among radio waves inputted from an antenna, and in particular, a satellite broadcast receiver equipped with a satellite wave tuner can clearly view several programs on one channel.

In this way, in the satellite broadcasting receiver capable of watching a plurality of programs in one channel, the automatic gain control signal AGC is adjusted to maintain a good reception state with respect to the input high frequency signal level.

That is, as shown in FIG. 1, the conventional satellite broadcast receiver amplifies or attenuates a high frequency signal (satellite broadcast signal) input through an antenna ANT with a low noise amplifier (LNA) or an attenuator (ATT) 10. In this case, when the input high frequency signal is a weak electric field signal, the amplification is performed through the low noise amplifier (LNA), and when the input high frequency signal is a strong electric field signal, the attenuator ATT is attenuated by the tuner 11. ).

The tuner 11 amplifies or attenuates and outputs an intermediate frequency by selecting only a desired channel frequency from an input high frequency signal, and then outputs the demodulator 12 to a baseband frequency (I / Q) through a filter and an intermediate frequency amplifier. The demodulator 12 demodulates the baseband frequency (I / Q) to output a desired video signal, detects an automatic gain control signal, and inputs the tuner 11 to the detected automatic gain control signal. Adjust the high frequency signal strength level.

Such a satellite broadcasting receiver may amplify a received signal and process it as a normal signal when a weak field signal is received, but is required when a strong field signal is received.

As a result, the signal is amplified and adversely affects the performance of the tuner, and there is a problem in that the broadcast reception sensitivity is lowered.

The present invention is to solve the above problems, a strong electric field to prevent the signal distortion caused by the strong electric field signal by using the attenuator by the tuner is turned off when the strong electric field signal is input The present invention relates to a satellite broadcasting receiver and a method of controlling the same.

According to an aspect of the present invention, there is provided a low noise amplifier which amplifies and outputs a satellite broadcast signal received from a satellite antenna in an on state, and attenuates and outputs a satellite broadcast signal received from a satellite antenna in an off state; A tuner for converting a signal input from the low noise amplifier into a baseband frequency signal and outputting the signal; Demodulates and outputs a baseband frequency signal input from the tuner, detects the strength level of the satellite broadcast signal output from the low noise amplifier, generates and outputs the low noise amplifier off control signal when the intensity level is greater than the strong electric field limit, and generates the weak electric field limit. A demodulator for generating and outputting the low noise amplifier on control signal when smaller; And a switch control circuit for turning off the low noise amplifier when a low noise amplifier off control signal is input from the demodulator and turning on the low noise amplifier when a low noise amplifier on control signal is input from the demodulator.

The demodulator may further include a level detector configured to detect and output an intensity level of the satellite broadcast signal output from the low noise amplifier; And a switch controller configured to generate and output the low noise amplifier off control signal when the intensity level detected and output from the level detector is greater than a strong electric field limit, and generate and output the low noise amplifier on control signal when the intensity level is less than a weak electric field limit. Characterized in that.

In addition, the level detector of the present invention is characterized in that for detecting and outputting the average intensity level for the entire band.

In addition, the level detector of the present invention is characterized in that for detecting and outputting the intensity level for a particular channel.

In addition, the present invention includes the steps of (A) the demodulator detects the intensity level of the high frequency signal passed through the low noise amplifier; (B) controlling the switch control circuit so that the low noise amplifier is turned off when the intensity level detected by the demodulator is greater than a predetermined strong field threshold; And (C) controlling the switch control circuit so that the low noise amplifier is turned on when the detected intensity level is lower than the predetermined weak electric field threshold.

In addition, the strength level detected by the demodulator in the step (A) of the present invention is characterized in that the average intensity level for the entire band of the high frequency signal passing through the low noise amplifier.

In addition, the strength level detected by the demodulator in the step (A) of the present invention is characterized in that the intensity level for a particular channel of the high frequency signal passed through the low noise amplifier.

In addition, the step (B) of the present invention, (B-1) is a step of determining whether the intensity level detected by the demodulator is greater than the predetermined strong field limit; (B-2) transmitting a low noise amplifier off control signal to the switch control circuit if the detected intensity level is greater than a predetermined strong electric field threshold as a result of the determination; And (B-3) switching off the low noise amplifier by the switch control circuit receiving the low noise amplifier off control signal from the demodulator.

In addition, the step (C) of the present invention, (C-1) is a step of determining whether the intensity level detected by the demodulator is less than the predetermined weak field limit; (C-2) transmitting a low noise amplifier on control signal to the switch control circuit if the detected intensity level is less than a predetermined weak electric field threshold as a result of the determination; And (C-3) turning on the low noise amplifier by the switch control circuit receiving the low noise amplifier on control signal from the demodulator.

Prior to that, terms and words used in the present specification and claims should not be construed in a conventional and dictionary sense, and the inventor may properly define the concept of the term in order to best explain its invention It should be construed as meaning and concept consistent with the technical idea of the present invention.

According to the present invention as described above, when a strong field signal is input, the low noise amplifier is turned off so that attenuation occurs due to the low noise amplifier being turned off, thereby preventing signal distortion caused by the strong field signal.

1 is a block diagram of a satellite broadcasting receiver according to the prior art.
2 is a configuration diagram of a satellite broadcasting receiver that supplements a strong electric field area according to a first embodiment of the present invention.
3 is a waveform diagram illustrating a general satellite frequency band and each channel signal strength.
FIG. 4 is an exemplary diagram illustrating a strong electric field limit and a weak electric field limit for the total band average intensity level used by the switch controller of FIG. 2.
5 is a conceptual diagram illustrating a process of generating a control signal in the switch controller of FIG. 2.
FIG. 6 is an exemplary diagram for showing a strong electric field limit and a weak electric field limit for strength levels of individual channels used in the switch controller of FIG. 2.
7 is a flowchart illustrating a control method of a satellite broadcast receiving apparatus supplementing a strong electric field area according to a first embodiment of the present invention.

The objects, specific advantages and novel features of the present invention will become more apparent from the following detailed description and the preferred embodiments associated with the accompanying drawings. In the present specification, in adding reference numerals to the components of each drawing, it should be noted that the same components as possible, even if displayed on different drawings have the same number as possible. In addition, in describing the present invention, if it is determined that the detailed description of the related known technology may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted.

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

2 is a configuration diagram of a satellite broadcasting receiver that supplements a strong electric field area according to a first embodiment of the present invention.

Referring to FIG. 2, the satellite broadcast receiver that supplements the strong electric field region according to the first embodiment of the present invention includes a high pass filter 110, a low noise amplifier 120, a tuner 130, a demodulator 140, and Switch control circuit 150. Here, the demodulator 140 includes a level detector 142 and a switch controller 144.

In this configuration, the high pass filter 110 is a high pass filter having a cutoff frequency of approximately 950 MHz. Specifically, the high pass filter 110 passes a frequency band of 950 MHz that is larger than the cutoff frequency of the satellite broadcast signals received from the satellite antenna, and exceeds the cutoff frequency. Eliminate low frequency bands, ie, frequency bands lower than 95 MHz.

When the low noise amplifier 120 is turned on by the switch control circuit 150, the low noise amplifier 120 amplifies and outputs a satellite broadcast signal input through a satellite antenna.

On the contrary, when the low noise amplifier 120 is turned off by the switch control circuit 150, the low noise amplifier 120 attenuates and outputs the satellite broadcast signal inputted through the satellite antenna at a unique attenuation rate.

On the other hand, the tuner 130 selects and tunes only a desired channel frequency from the input satellite broadcast signal, receives an automatic gain control signal (AGC) fed back, and adjusts the gain of the input satellite broadcast signal to convert it into an intermediate frequency signal. do.

The tuner 130 removes unnecessary signals from the intermediate frequency signal using a filter, and includes an amplifier to output an amplified baseband frequency signal I / Q.

The demodulator 140 demodulates the baseband frequency (I / Q) input from the tuner 130, outputs a desired video signal, detects an automatic gain control signal, and is received by the tuner 130. The gain of the high frequency signal is adjusted.

The demodulator 140 includes a level detector 142 and a switch controller 144 to detect and detect an average intensity level of the entire band of the high frequency signal passed through the high pass filter 110 and the low noise amplifier 120. Output the low noise amplifier off control signal to the switch control circuit 150 when the average intensity level is greater than the strong electric field limit, and output the low noise amplifier off control signal to the switch control circuit 150 when the detected average intensity level is less than the weak electric field limit. Will output

Looking at this in more detail, first, the level detector 142 provided in the demodulator 140 has an average over the entire band of the high frequency signal passed through the high pass filter 110 and the low noise amplifier 120, as shown in FIG. 3. Detect the intensity level.

In addition, the switch controller 144 compares the average intensity level of the entire band detected by the level detector 142 with a predetermined strong field limit value and transmits a low noise amplifier off control signal to the switch control circuit 150 when it is larger than the strong field limit value. send.

In addition, the switch controller 144 compares the average intensity level of the entire band detected by the level detector 142 with the weak field limit value to be preset to the low level amplifier on control signal when the switch control circuit 150 becomes smaller. Send it.

Meanwhile, when the low noise amplifier off control signal is input from the switch control unit 144 of the demodulator 140, the switch control circuit 150 turns off the low noise amplifier 120, and the low noise amplifier on control signal is input from the switch control unit 144. When input, the low noise amplifier 120 is turned on.

Referring to the operation of the satellite broadcasting reception device that supplements the strong electric field of the present invention configured as described above is as follows.

First, the satellite broadcast signal received through the satellite antenna is passed through the high pass filter 110, the frequency band signal below the cutoff frequency is removed and input to the low noise amplifier 120.

In addition, when the low noise amplifier 120 receiving the high frequency signal from which the frequency band signal below the cutoff frequency is removed is turned on, the low noise amplifier 120 amplifies and outputs the high frequency signal passed through the high pass filter 110. Next, the high-frequency signal passing through the high pass filter 110 is attenuated at a unique attenuation rate and output to the tuner 130.

Then, the tuner 130 converts the high frequency signal input from the low noise amplifier 120 into an intermediate frequency signal, removes unnecessary signals through a filter, and converts the high frequency signal into a baseband signal through an amplifier and outputs the demodulator 140.

The demodulator 140, which receives the baseband signal from the tuner 130, demodulates the input baseband frequency (I / Q), outputs a desired video signal, and detects an automatic gain control signal to detect the tuner. The gain of the high frequency signal received by the 130 is adjusted.

The demodulator 140 detects an average intensity level over the entire band of the high frequency signal passed through the high pass filter 110 and the low noise amplifier 120 using the level detector 142 provided.

As such, when the level detector 142 detects and outputs an average intensity level over the entire band of the high frequency signal, the switch controller 144 of the entire band detected when the low noise amplifier 120 is turned on, as shown in FIG. 5. When the average intensity level is greater than the predetermined strong field limit, the low noise amplifier off control signal is transmitted to the switch control circuit 150.

As shown in FIG. 5, the switch control unit 144 uses the switch control circuit 150 when the average intensity level of the entire band detected when the low noise amplifier 120 is turned off is smaller than the predetermined weak electric field limit. Transmit the amplifier on control signal.

On the other hand, when the low noise amplifier off control signal is input from the switch controller 144, the switch control circuit 150 turns off the low noise amplifier 120 so that the low noise amplifier 120 passes the high pass filter 110. Attenuate by one attenuation rate to output to the tuner 130.

In contrast, when the switch control circuit 150 receives the low noise amplifier on control signal from the switch controller 144, the switch control circuit 150 turns on the low noise amplifier 120 to amplify the high frequency signal passed through the high pass filter 110. Output to the tuner 130.

Meanwhile, the demodulator 140 detects the average intensity level of the entire band and generates the low noise amplifier off control signal or the low noise amplifier on control signal by comparing the detected average intensity level with the strong electric field limit or the weak electric field limit. As shown in FIG. 6, the low noise amplifier off control signal or the low noise amplifier on control signal is transmitted by detecting the intensity level of each channel 1 to N and comparing with the strong field limit or the weak field limit. It can be turned off or on.

7 is a flowchart illustrating a control method of a satellite broadcast receiving apparatus supplementing a strong electric field area according to a first embodiment of the present invention.

Referring to FIG. 7, in the method for controlling a satellite broadcast receiver that supplements the strong electric field region according to the first embodiment of the present invention, first, a level detector of a demodulator is used to determine a high frequency signal passed through a high pass filter and a low noise amplifier. The strength level is detected for the entire band or a necessary channel (S110).

Subsequently, the switch controller provided in the demodulator determines whether the detected intensity level is greater than a predetermined strong electric field limit (S120).

As a result of the determination, when the detected intensity level is larger than the predetermined strong electric field limit value, the switch controller transmits a low noise amplifier off control signal to the switch control circuit (S130).

The switch control circuit receiving the low noise amplifier off control signal from the switch controller turns off the low noise amplifier (S140). Accordingly, the low noise amplifier attenuates and outputs a high frequency signal inputted at a unique attenuation rate.

On the contrary, if the detected intensity level is smaller than the predetermined strong electric field limit value, the process is repeated from step S110.

On the other hand, while the low noise amplifier is turned off, the level detector continuously detects the intensity level of the high frequency signal passing through the high pass filter and the low noise amplifier (S150).

Thereafter, the switch controller determines whether the detected intensity level is smaller than the predetermined weak electric field threshold (S160).

As a result of the determination, when the detected intensity level is smaller than the predetermined weak electric field threshold, the switch controller transmits a low noise amplifier on control signal to the switch control circuit (S170).

The switch control circuit receiving the low noise amplifier on control signal from the switch controller turns on the low noise amplifier (S180) so that the low noise amplifier amplifies and outputs a high frequency signal.

On the contrary, if the detected intensity level is larger than the predetermined weak electric field threshold, the process is repeated from step S150.

Although the above has been illustrated and described with respect to the preferred embodiments of the present invention, the present invention is not limited to the above-described specific embodiments, it is common in the technical field to which the invention belongs without departing from the spirit of the invention claimed in the claims. Various modifications can be made by those skilled in the art, and these modifications should not be individually understood from the technical spirit or the prospect of the present invention.

110: high pass filter 120: low noise amplifier
130: tuner 140: demodulator
142: level detector 144: switch controller
150: switch control circuit

Claims (9)

A low noise amplifier which amplifies and outputs the satellite broadcast signal received from the satellite antenna in the on state, and attenuates and outputs the satellite broadcast signal received from the satellite antenna in the off state;
A tuner for converting a signal input from the low noise amplifier into a baseband frequency signal and outputting the signal;
Demodulates and outputs a baseband frequency signal input from the tuner, detects the strength level of the satellite broadcast signal output from the low noise amplifier, generates and outputs the low noise amplifier off control signal when the intensity level is greater than the strong electric field limit, and generates the weak electric field limit. A demodulator for generating and outputting the low noise amplifier on control signal when smaller; And
And a switch control circuit for turning off the low noise amplifier when a low noise amplifier off control signal is input from the demodulator and turning on the low noise amplifier when a low noise amplifier on control signal is input from the demodulator.
The method according to claim 1,
The demodulator,
A level detector for detecting and outputting an intensity level of the satellite broadcast signal output from the low noise amplifier; And
And a switch controller configured to generate and output the low noise amplifier off control signal when the intensity level detected and output from the level detector is greater than a strong electric field limit, and generate and output the low noise amplifier on control signal when the intensity level is less than the weak electric field limit. Satellite broadcast receiving device.
The method according to claim 2,
And the level detector detects and outputs an average intensity level for all bands.
The method according to claim 2,
And the level detector detects and outputs a strength level of a specific channel.
(A) the demodulator detecting the intensity level of the high frequency signal passing through the low noise amplifier;
(B) controlling the switch control circuit so that the low noise amplifier is turned off when the intensity level detected by the demodulator is greater than a predetermined strong field threshold; And
And (C) controlling the switch control circuit so that the low noise amplifier is turned on when the detected intensity level of the demodulator is smaller than the predetermined weak electric field limit value.
The method according to claim 5,
And a strength level detected by the demodulator in step (A) is an average intensity level for the entire band of the high frequency signal passing through the low noise amplifier.
The method according to claim 5,
And a strength level detected by the demodulator in step (A) is a strength level for a specific channel of the high frequency signal passing through the low noise amplifier.
The method according to claim 5,
Step (B) is,
(B-1) determining whether the intensity level detected by the demodulator is greater than a predetermined strong electric field threshold;
(B-2) transmitting a low noise amplifier off control signal to the switch control circuit if the detected intensity level is greater than a predetermined strong electric field threshold as a result of the determination; And
(B-3) A control method of a satellite broadcasting receiver comprising switching the low noise amplifier off by a switch control circuit receiving a low noise amplifier off control signal from a demodulator.
The method according to claim 5,
Step (C) is
(C-1) determining whether the intensity level detected by the demodulator is smaller than a predetermined weak electric field threshold;
(C-2) transmitting a low noise amplifier on control signal to the switch control circuit if the detected intensity level is less than a predetermined weak electric field threshold as a result of the determination; And
(C-3) A control method of a satellite broadcasting receiver comprising switching a low noise amplifier by a switch control circuit receiving a low noise amplifier on control signal from a demodulator.
KR1020100068071A 2010-07-14 2010-07-14 Satellite receiver for strong electric field and control method thereof KR20120007350A (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20140001669A (en) * 2012-06-28 2014-01-07 삼성전기주식회사 Image signal receiving apparatus and the method thereof
KR20140059483A (en) * 2012-11-08 2014-05-16 삼성전기주식회사 Common mode filter and manufacturing method thereof
US11916639B2 (en) 2020-03-12 2024-02-27 Telefonaktiebolaget Lm Ericsson (Publ) Antenna apparatus and method in an antenna apparatus for selectively combining antenna outputs

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20140001669A (en) * 2012-06-28 2014-01-07 삼성전기주식회사 Image signal receiving apparatus and the method thereof
KR20140059483A (en) * 2012-11-08 2014-05-16 삼성전기주식회사 Common mode filter and manufacturing method thereof
US11916639B2 (en) 2020-03-12 2024-02-27 Telefonaktiebolaget Lm Ericsson (Publ) Antenna apparatus and method in an antenna apparatus for selectively combining antenna outputs

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