KR20140059483A - Common mode filter and manufacturing method thereof - Google Patents

Common mode filter and manufacturing method thereof Download PDF

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Publication number
KR20140059483A
KR20140059483A KR1020120125987A KR20120125987A KR20140059483A KR 20140059483 A KR20140059483 A KR 20140059483A KR 1020120125987 A KR1020120125987 A KR 1020120125987A KR 20120125987 A KR20120125987 A KR 20120125987A KR 20140059483 A KR20140059483 A KR 20140059483A
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South Korea
Prior art keywords
transponder
channel power
received
unit
amplifying
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KR1020120125987A
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Korean (ko)
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KR102039950B1 (en
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김태훈
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삼성전기주식회사
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    • 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
    • H04N5/52—Automatic gain control
    • 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
    • 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

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Multimedia (AREA)
  • Circuits Of Receivers In General (AREA)
  • Input Circuits Of Receivers And Coupling Of Receivers And Audio Equipment (AREA)

Abstract

The present invention relates to an apparatus and method for receiving broadcast signals having a plurality of channels. According to one embodiment of the present invention, there is provided an amplification apparatus including an attenuator and an amplifier, amplifying an RF broadcast signal having a plurality of received channels according to gain control; A tuner unit receiving a RF broadcast signal output from the amplifying unit and tuning a tuned frequency channel; A demodulator for demodulating the output signal of the tuner unit, scanning all transponders for all channels of the RF broadcast signal received by the tuner unit, calculating and storing channel power for each transponder, And a gain controller for comparing the average value or the average range of the channel powers of the stored transponders with the channel power of the transponder to be received and controlling the amplifier according to the comparison result . Also, a broadcasting signal receiving method having a plurality of channels is proposed.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a broadcast signal receiving apparatus and method,

The present invention relates to an apparatus and method for receiving broadcast signals having a plurality of channels. And more particularly, to a broadcasting signal receiving apparatus and method having a plurality of channels for controlling gain using channel power of each transponder.

For existing satellite tuners, the automatic gain control (AGC) value is set for the high channel power transponder when there is a channel power difference between the transponders (TP). Accordingly, a relatively small channel power transponder may fail to receive the corresponding channel signal because the AGC may not operate. That is, the automatic gain control (AGC) value is set to the power reference of the high level transponder, so that the small level transponder does not have enough AGC value to be able to receive.

Japanese Patent Application Laid-Open No. 2006-024772 (published on Jan. 26, 2006)

In order to solve the above-described problem, the channel power of each transponder is calculated and applied to the automatic gain control, so that the channel signal having high power is not saturated and the channel signal having low power is not missed, A broadcast signal receiving apparatus and a broadcast signal receiving method in which there is no problem in reception are proposed.

According to a first aspect of the present invention, there is provided an amplifier for amplifying an RF broadcast signal having a plurality of received channels according to gain control, the amplifier comprising an attenuator and an amplifier, A tuner unit receiving a RF broadcast signal output from the amplifying unit and tuning a tuned frequency channel; A demodulator for demodulating the output signal of the tuner unit, scanning all transponders for all channels of the RF broadcast signal received by the tuner unit, calculating and storing channel power for each transponder, And a gain controller for comparing the average value or the average range of the channel powers of the stored transponders with the channel power of the transponder to be received and controlling the amplifier according to the comparison result .

At this time, in one example, the gain control unit prevents the attenuator of the amplification unit from operating when the channel power of the transponder scheduled to be received in the comparison result is less than the average value or deviates from the lower limit of the average range, The attenuator of the amplifying part can be operated when the channel power is higher than the average value or deviates from the upper limit of the average range.

In this case, the gain control unit may automatically control the amplification gain of the amplification unit according to the channel power of the transponder to be received.

Next, in order to solve the above-mentioned problems, according to a second embodiment of the present invention, there is provided an amplifying apparatus including an attenuator and an amplifier, amplifying an RF broadcast signal having a plurality of received channels according to gain control; A tuner unit receiving a RF broadcast signal output from the amplifying unit and tuning a tuned frequency channel; A demodulator for demodulating the output signal of the tuner unit, scanning all transponders for all channels of the RF broadcast signal received by the tuner unit, calculating and storing channel power for each transponder, And a gain controller for comparing a maximum value, a minimum value, or a maximum value and a minimum value of the channel powers of the stored transponders with the channel power of the transponder to be received and controlling the amplification unit according to a result of the comparison, A receiving apparatus is proposed.

In this case, in one example, the gain control unit may grasp the difference between the maximum value and the channel power of the transponder to be received. If the difference exceeds the first level, the attenuator of the amplifying unit is disabled and the channel power of the transponder The amplification gain of the amplification unit is automatically controlled and the attenuation unit of the amplification unit can be operated when the difference is equal to or smaller than a second level lower than or equal to the first bevel.

Also, in one example, the gain control unit may determine the difference between the minimum value and the channel power of the transponder to be received, and if the difference is less than the third level, the attenuator of the amplifying unit is disabled and the channel power of the transponder The amplification gain of the amplification unit is varied and controlled automatically. When the difference is equal to or larger than the fourth level, which is greater than or equal to the third bevel, the attenuator of the amplification unit can be operated.

According to another example, the gain control unit may grasp the difference between the maximum value and the minimum value and the channel power of the transponder scheduled to be received, and if the difference from the maximum value is larger than the difference from the minimum value or larger than the fifth level, The attenuator of the amplifying part is operated when the difference between the minimum value and the channel gain of the amplifying part is greater than the difference between the maximum value and the fifth level or more. .

In the first and second embodiments, the channel power of each transponder can be calculated by using a control gain value applied when the RF broadcast signal scanned by all the transponders is amplified by the amplifying unit .

Also, in the first and second embodiments described above, the amplifier includes a low noise amplifier, and the RF broadcast signal is a satellite broadcast signal.

Next, in order to solve the above-described problem, according to the third embodiment of the present invention, all the transponders for all the channels of the RF broadcast signal having a plurality of channels received by the tuner unit through the amplifying unit are scanned, A channel power calculation step of calculating and storing channel power; A channel power comparison step of comparing an average value or an average range of channel powers of all the transponders stored and a channel power of a transponder to be received; A broadcasting signal amplifying step of amplifying an RF broadcasting signal by controlling an amplifying unit including an attenuator and an amplifier in a gain control unit according to the comparison result; And a tuning and demodulating step of tuning a tuned frequency channel corresponding to a channel of the transponder scheduled to be received from the RF broadcast signal amplified and outputted according to the comparison result and demodulating the output signal for the tuned channel, A broadcast signal receiving method is proposed.

At this time, according to one example, in the broadcasting signal amplifying step, when the channel power of the transponder scheduled to receive the comparison result is less than the average value or deviates from the lower limit of the average range, the attenuator of the amplifying unit is prevented from operating, The attenuator of the amplification section can be operated when the channel power of the predetermined transponder is equal to or higher than the average value or deviates from the upper limit of the average range.

At this time, the amplification gain of the amplification unit can be varied according to the channel power of the transponder, which is expected to be received in the broadcasting signal amplification step, to be automatically controlled.

Next, in order to solve the above problems, according to a fourth embodiment of the present invention, all the transponders for all channels of an RF broadcasting signal having a plurality of channels received by the tuner unit through the amplifying unit are scanned, A channel power calculation step of calculating and storing channel power; Comparing a maximum value, a minimum value, or a maximum value and a minimum value of the channel powers of the stored transponders with the channel power of the transponder to be received; A broadcasting signal amplifying step of amplifying an RF broadcasting signal by controlling an amplifying unit including an attenuator and an amplifier in a gain control unit according to the comparison result; And a tuning and demodulating step of tuning a tuned frequency channel corresponding to a channel of the transponder scheduled to be received from the RF broadcast signal amplified and outputted according to the comparison result and demodulating the output signal for the tuned channel, A broadcast signal receiving method is proposed.

At this time, according to one example, in the channel power comparison step, the difference between the maximum value and the channel power of the transponder to be received is grasped, and in the broadcasting signal amplification step, when the difference exceeds the first level, The amplification gain of the amplification unit is automatically controlled according to the channel power of the transponder scheduled to be received, and the attenuator of the amplification unit can be operated when the difference is equal to or smaller than a second level lower than or equal to the first bevel.

According to one example, in the channel power comparing step, the difference between the minimum value and the channel power of the transponder to be received is grasped, and in the broadcasting signal amplifying step, the attenuator of the amplifying part is prevented from operating when the difference is less than the third level The amplification gain of the amplification unit is automatically controlled according to the channel power of the transponder scheduled to be received, and the attenuator of the amplification unit can be operated when the difference is equal to or larger than the fourth level, which is greater than or equal to the third bevel.

According to another example, in the channel power comparing step, the difference between each of the maximum and minimum values and the channel power of the transponder to be received is grasped, and in the broadcasting signal amplifying step, the difference between the maximum value and the maximum value is larger than the difference The attenuator of the amplifying part is prevented from operating and the amplifying gain of the amplifying part is automatically controlled in accordance with the channel power of the transponder to be received so that the difference from the minimum value is larger than the difference from the maximum value, The attenuator of the amplifying part can be operated.

In the third and fourth embodiments described above, the calculation of the channel power for each transponder in the channel power calculation step may be performed by using the control gain value applied when the RF broadcast signal scanned by all the transponders is amplified in the amplification unit Can be calculated.

According to the embodiment of the present invention, the channel power of each transponder is calculated and applied to the automatic gain control, so that the channel signal having the high power is not saturated and the channel signal having the low power is not missed, So that there is no problem in receiving the channel.

It is apparent that various effects not directly referred to in accordance with various embodiments of the present invention can be derived by those of ordinary skill in the art from the various configurations according to the embodiments of the present invention.

FIG. 1A is a block diagram schematically illustrating a broadcast signal receiving apparatus having a plurality of channels according to an embodiment of the present invention.
1B is a block diagram schematically illustrating a broadcasting signal receiving apparatus having a plurality of channels according to another embodiment of the present invention.
2 is a flowchart schematically illustrating a method of receiving a broadcast signal having a plurality of channels according to another example of the present invention.
3 is a flowchart schematically illustrating a method of receiving a broadcast signal having a plurality of channels according to another example of the present invention.
4 is a graph schematically showing insertion loss characteristics of a common mode filter according to a comparative example.
5 is a graph schematically illustrating insertion loss characteristics of a common mode filter according to an embodiment of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a block diagram showing the configuration of a first embodiment of the present invention; Fig. In the description, the same reference numerals denote the same components, and a detailed description may be omitted for the sake of understanding of the present invention to those skilled in the art.

It should be noted that, even though a singular expression is described in this specification, it can be used as a concept representing the entire plurality of constitutions unless it is contrary to, or obviously different from, or inconsistent with the inventive concept. It is to be understood that the phrases "including", "having", "having", "comprising", etc. in this specification are intended to be additionally or interchangeable with one or more other elements or combinations thereof.

First, a broadcast signal receiving apparatus having a plurality of channels according to a first embodiment of the present invention will be described in detail with reference to the drawings. Here, reference numerals not shown in the drawings to be referred to may be reference numerals in other drawings showing the same configuration.

FIG. 1A is a block diagram schematically illustrating a broadcast signal receiving apparatus having a plurality of channels according to an embodiment of the present invention. FIG. 1B is a block diagram of a broadcast signal receiving apparatus having a plurality of channels according to another embodiment of the present invention. Fig.

1A and 1B, a broadcasting signal receiving apparatus having a plurality of channels according to one example includes an amplifying unit 10, a tuner unit 30, a demodulating unit 50, and a gain controlling unit 70 . Let's look at each configuration in detail. In this embodiment, the RF broadcast signal received through the antenna may be a satellite broadcast signal, but is not limited thereto.

Referring to Figs. 1A and 1B, the amplification section 10 includes an attenuator 11 and an amplifier 13. At this time, the signal received from the antenna is transmitted to the amplifier 13 via the attenuator 11, and the gain can be amplified by the amplifier 13 according to the control gain value. The amplification unit 10 amplifies an RF broadcast signal having a plurality of channels received through the antenna according to the gain control of the gain control unit 70. Although not shown, a noise filter or the like may be inserted between the amplification unit 10, that is, between the attenuator 11 and the antenna.

1B, the amplifier 13 of the amplifying unit 10 includes a low noise amplifier (LNA) The LNA 131 is intended to lower the noise figure of the entire receiving apparatus.

The amplifier 13 of the amplification unit 10 may further include a variable gain amplifier in addition to the LNA 131. At this time, the variable gain amplifier varies the amplification gain according to the gain control of the gain controller 70 according to the channel power of the transponder to be received. For example, referring to FIG. 1B, the amplifier 13 of the amplifier 10 may further include an RF VGA 133, a mixer 135, and an IF VGA 137 in addition to the LNA 131. At this time, a Variable Gain Amplifier may be configured by the RF VGA 133, the MIXER 135, and the IF VGA 137. The RF VGA 133 is an RF Variable Gain Amplifier. The RF VGA 133 amplifies the RF signal output from the LNA 131 according to the gain control of the gain controller 70 according to the channel power of the transponder, . The mixer 135 mixes an intermediate frequency (IF) base signal generated in a local oscillator (LO) (not shown) and an output signal of the RF VGA 133 to convert the RF signal into an intermediate frequency (IF) signal do. The IF VGA 137 is an intermediate frequency (IF) variable gain amplifier that variably amplifies the intermediate frequency signal according to the gain control of the gain control unit 70 and outputs the amplified intermediate frequency signal. Although not shown, a filter may be further inserted to remove interference and / or noise before being variably amplified in the RF VGA 133.

Next, referring to FIG. 1A and / or 1B, the tuner unit 30 receives the RF broadcast signal output from the amplifying unit 10 and selects a tuning frequency channel. The tuner unit 30 tunes the frequency of the channel to be tuned and tunes the channel signal included in the RF broadcast signal. 1B, a signal input to the tuner unit 30 may be an intermediate frequency (IF) signal, which is variably amplified according to the control of the gain controller 70 according to the channel power of the transponder to be received .

Next, referring to FIG. 1A and / or 1B, the demodulator 50 demodulates the output signal of the tuner 30. The demodulator 50 scans all the transponders for all the channels of the RF broadcast signal received by the tuner 30. For example, the demodulation unit 50 may be configured as a demodulation IC module. A transponder is a transceiver for relaying a broadcast signal, for example, in the case of a satellite broadcast signal. Since a broadcast signal of a plurality of channels is transmitted at a time, each transponder amplifies a signal for each channel and transmits the amplified signals to one carrier signal. That is, the RF broadcast signal received by the tuner unit 30 contains transponder information of each channel for each channel signal included in the broadcast signal. Therefore, the demodulation unit 50 can scan the entire transponders for all the channels from the RF broadcast signal received at the tuner unit 30. The demodulator 50 calculates and stores channel power for each transponder. The calculated channel power for each transponder can be stored in a memory in the IC module, for example, when the demodulation unit 50 is an IC module.

In this case, in one example, the demodulation unit 50 may calculate the channel power for each transponder using the control gain value applied when the RF broadcast signal scanned by all the transponders is amplified by the amplification unit 10. For example, in the demodulator 50, channel power of each transponder can be calculated by dividing the power of a channel for each transponder of the RF broadcast signal received by the tuner unit 30 by a control gain value. For example, the power value of each transponder can be obtained by selecting the frequency of each transponder in the tuner unit 30. At this time, a control gain value applied to each transponder frequency is applied to the obtained power value of the transponder The channel power of each transponder can be calculated.

Next, the gain control unit 70 will be described with reference to Figs. 1A and 1B.

The gain control unit 70 compares the average value or the average range of the channel powers of all the transponders stored in the demodulation unit 50 with the channel power of the transponder to be received. The gain control unit 70 can determine whether or not the channel power of the transponder of the channel to be received is less than or less than the average value or not and if the channel power of the transponder of the channel to be received is smaller than a predetermined average range The upper limit and / or the lower limit of the above-mentioned range. At this time, the gain control unit 70 controls the amplification unit 10 according to the comparison result. For example, the gain control section 70 may perform automatic gain control (AGC). For example, referring to FIG. 1B, the amplification gain of the variable gain amplifier of the amplification unit 10 may be varied in accordance with the automatic gain control (AGC) of the gain control unit 70.

For example, the gain control unit 70 can prevent the attenuator 11 of the amplification unit 10 from operating when the channel power of the transponder of the channel expected to be received in the comparison result is less than the average value or deviates from the lower limit of the average range .

At this time, the gain control unit 70 can automatically control the amplification gain of the amplification unit 10 according to the channel power of the transponder to be received. 1B, the amplifier 13 of the amplifier 10 may further include a variable gain amplifier in addition to the LNA 131. In this case, the gain controller 70 may control the gain of the LNA 131 according to the channel power of the transponder It is possible to vary the amplification gain in the variable amplifier and amplify the output of the variable amplifier 131. [ For example, in the case where the channel power of the transponder scheduled to be received is less than the average value or deviates from the lower limit of the average range, the amplification gain is increased as the channel power of the transponder to be received is smaller, and as the channel power of the transponder Can be reduced. For example, in the case of satellite broadcasting, when the average range is set and the reference is defined by the upper limit and the lower limit, the average range between the upper limit and the lower limit may be -25 dBm to -65 dBm, but is not limited thereto.

The gain control unit 70 can operate the attenuator 11 of the amplification unit 10 when the channel power of the transponder scheduled to be received in the comparison result is equal to or greater than the average value or deviates from the upper limit of the average range. At this time, by operating the attenuator 11, it is possible to prevent saturation by amplification according to the control gain. For example, even when the attenuator 11 is operated by the gain control unit 70, the amplification gain of the amplifier 13, for example, the variable amplifier can be varied according to the channel power of the transponder scheduled to be received so as to be automatically controlled.

Next, a broadcasting signal receiving apparatus having a plurality of channels according to a second embodiment of the present invention will be described with reference to the drawings. At this time, the above-described first embodiments will be referred to, and therefore redundant explanations may be omitted.

The present embodiment has the same configuration as that of the above-described first embodiment, and only the difference between the functions of the configuration of the gain control section 70 will be mainly described. The present embodiment will be described with reference to Figs. 1A and / or 1B as in the above-described first embodiment, and the function of each configuration will also be described with reference to Figs. 4 and / or 5. Fig.

1A and 1B, a broadcast signal receiving apparatus having a plurality of channels according to the second embodiment includes an amplifier 10, a tuner 30, a demodulator 50, and a gain controller 70 do. At this time, the received RF broadcast signal may be a satellite broadcast signal, but is not limited thereto.

First, the amplification section 10 includes an attenuator 11 and an amplifier 13. The amplification unit 10 amplifies the RF broadcast signal having the received multiple channels according to the gain control of the gain control unit 70. At this time, the amplifier 13 may include a low noise amplifier (LNA) 131 for amplifying the noise signal of the received signal by amplifying the signal. 1B, the amplifier 13 may include a variable amplifier in addition to the LNA 131. For example, the variable amplifier may include an RF VGA 133, a mixer 135, and an IF VGA 137. [ . ≪ / RTI >

Next, the tuner unit 30 receives the RF broadcast signal output from the amplifying unit 10 and selects a tuning frequency channel.

Next, the demodulator 50 demodulates the output signal of the tuner 30. The demodulator 50 scans the entire transponders for all the channels of the RF broadcast signal received by the tuner unit 30 and calculates and stores the channel power for each transponder. At this time, the demodulator 50 can calculate the channel power for each transponder by using the control gain value applied when the RF broadcast signal scanned by all the transponders is amplified by the amplifying unit 10. For example, the power value of each transponder can be obtained by selecting the frequency of each transponder in the tuner unit 30. At this time, a control gain value applied to each transponder frequency is applied to the obtained power value of the transponder The channel power of each transponder can be calculated. For example, the control gain value may be an automatic control value for the variable gain control in the variable amplifier of the amplifier 13, or a gain value including the amplification gain of the LNA 131 and the variable gain control value of the variable amplifier.

Next, the gain control unit 70 will be described. The gain controller 70 compares the maximum, minimum, maximum, and minimum of the channel powers of all transponders stored in the demodulator 50 with the channel power of the transponder to be received. For example, the demodulation unit 50 may compare the maximum channel power of all transponders with the channel power of a transponder to be received, and determine whether the difference exceeds a predetermined level. Alternatively, the demodulator 50 may compare the channel power of the transponders to be received with the minimum of the channel powers of all the transponders, and determine whether the difference is less than a predetermined level. Alternatively, the demodulation unit 50 may compare the maximum and minimum values of the channel powers of all the transponders with the channel power of the transponder to be received, and compare the difference between the maximum value and the minimum value. At this time, the demodulation unit 50 controls the amplification unit 10 according to the comparison result. For example, it may be determined whether the difference between the maximum and minimum values of the channel powers of all transponders is within a predetermined gap range, and the gain control unit 70 may perform control based on the difference. For example, if the difference between the maximum value and the minimum value is in a range of about 20 to 30 dBc, it is determined whether or not the difference between the maximum value and the minimum value of the channel powers of all transponders is within a predetermined gap range, Control can be performed.

For example, in one example, when the difference between the maximum of the channel powers of all the transponders and the channel power of the transponder to be received exceeds the first level, the gain control section 70 controls the attenuator 11 ) Can not be operated. At this time, the gain control unit 70 can vary the amplification gain of the amplification unit 10, for example, the variable amplifier of the amplification unit 11 according to the channel power of the transponder scheduled to be received.

The gain control unit 70 operates the attenuator 11 of the amplification unit 10 when the difference between the maximum of the channel powers of all the transponders and the channel power of the transponder to be received is less than or equal to the second level . At this time, by operating the attenuator 11, it is possible to prevent saturation by amplification according to the control gain. At this time, the second level value is equal to or smaller than the first bevel value. Even when the attenuator 11 of the amplifying unit 10 operates, the gain control unit 70 can vary the amplification gain of the amplifying unit 10, for example, the variable amplifier of the amplifying unit 11 according to the channel power of the transponder, .

For example, when an appropriate range of the difference between the maximum value and the minimum value of the channel powers of all the transponders is assumed to be 20 to 30 dBc, the difference between the maximum of the channel powers of all transponders and the channel power of the transponder to be received is the first level The gain controller 70 controls the attenuator 11 of the amplifier 10 to be inoperable in the gain controller 70 and is smaller than or equal to the second level of 20 dBc, It is possible to prevent saturation by operating the attenuator 11 of FIG.

In addition, in one example, when the difference between the minimum of the channel powers of all the transponders and the channel power of the transponder to be received is less than the third level, the gain control unit 70 determines that the attenuator 11 of the amplification unit 10 You can disable it. At this time, the gain control unit 70 can automatically control the amplification gain of the amplification unit 10, for example, the variable amplifier according to the channel power of the transponder scheduled to be received.

The gain control unit 70 can operate the attenuator 11 of the amplification unit 10 when the difference between the minimum value of the channel powers of all the transponders and the channel power of the transponder to be received is equal to or greater than the fourth level have. At this time, the fourth level value is equal to or greater than the third bevel value. The gain control section 70 can vary the amplification gain of the amplification section 10, for example, the variable amplifier according to the channel power of the transponder scheduled to be received even when the attenuator 11 of the amplification section 10 operates.

For example, when the appropriate range of the difference between the maximum value and the minimum value of the channel powers of all transponders is assumed to be 20 to 30 dBc, if the difference between the channel power of the transponder to be received and the minimum value is smaller than the third level, for example 20 dBc, The gain control section 70 controls the attenuator 11 of the amplification section 10 to be inoperative if the fourth level is greater than or equal to 30 dBc, The saturation can be prevented.

In another example, the gain control unit 70 determines the difference between the maximum and minimum values of the channel powers of all the transponders and the channel power of the transponder to be received. At this time, when the difference from the maximum value is larger than the difference from the minimum value or larger than the fifth level, the gain control unit 70 can prevent the attenuator 11 of the amplification unit 10 from operating. In this case, the gain control section 70 can perform the automatic control by varying the amplification gain of the amplification section 10, for example, the variable amplifier according to the channel power of the transponder scheduled to be received.

Also, the gain control unit 70 can operate the attenuator 11 of the amplification unit 10 when the difference from the minimum value is larger than the difference from the maximum value or larger than the fifth level. At this time, the gain control unit 70 can vary the amplification gain of the amplification unit 10, for example, the variable amplifier of the amplification unit 11 according to the channel power of the transponder scheduled to be received.

(The difference between the maximum value and the channel power of the transponder to be received) - (the difference between the channel power of the transponder to be received and the minimum value)} and the fifth level are compared with each other. For example, when an appropriate range of the difference between the maximum value and the minimum value of the channel powers of all the transponders is assumed to be 20 to 30 dBc (difference of the channel power of the transponder scheduled to be received with the maximum value) (Difference between the maximum value and the channel power of the transponder to be received) - (the difference between the channel power of the transponder to be received and the minimum value) dBc), the gain control unit 70 can prevent the attenuator 11 of the amplification unit 10 from operating, while if the difference between the channel power of the transponder to be received and the minimum value is larger than the maximum value (The difference between the channel power of the transponder to be received and the channel power of the transponder to be received), and the difference (the difference between the channel power of the transponder to be received and the channel power of the transponder to be received) Line in ~ 30 dBc The gain control section 70 can operate the attenuator 11 of the amplification section 10 to prevent saturation.

Next, a broadcast signal receiving method having a plurality of channels according to a third embodiment of the present invention will be described with reference to the drawings. At this time, examples of a broadcast signal receiving apparatus having a plurality of channels according to the first embodiment described above and FIG. 1A will be referred to, and thus redundant explanations may be omitted.

FIG. 2 is a flowchart schematically illustrating a method of receiving a broadcast signal having a plurality of channels according to another example of the present invention. FIG. 3 schematically illustrates a method of receiving a broadcast signal having a plurality of channels according to another example of the present invention. Fig.

2 and 3, a broadcast signal receiving method having a plurality of channels according to one example includes a channel power calculating step S100, a channel power comparing step S300, a broadcasting signal amplifying step S500, And demodulating step S700. Each step is discussed in detail. In this embodiment, the RF broadcast signal having a plurality of channels received by the tuner unit 30 may be a satellite broadcast signal, but is not limited thereto.

Next, referring to FIG. 2 and FIG. 3, in the channel power calculation step S100, first, all channels of an RF broadcast signal having a plurality of channels received by the tuner unit 30 through the amplifier unit 10 The entire transponders are scanned. In step S100, the channel power is calculated and stored for each transponder of the scanned transponders.

At this time, the calculation of the channel power for each transponder can be performed by using the control gain value applied when the RF broadcast signal scanned by all the transponders is amplified by the amplification unit 10. [

Next, referring to FIG. 2 and FIG. 3, in the channel power comparison step S300, an average value or average range of channel powers of all transponders stored in the channel power calculation step S100 and a channel power of a transponder Are compared.

2 and / or 3, in the broadcasting signal amplifying step S500, the gain controller 70 controls the attenuator 11 and the amplifier 13 ) Is controlled to amplify the RF broadcast signal.

3, when the channel power of the transponder to be received is less than the average value or deviates from the lower limit of the average range in step S310, In the amplifying step S510, the attenuator 11 of the amplifying unit 10 may be prevented from operating (S511). In addition, when the channel power of the transponder to be received is less than the average value or deviates from the lower limit of the average range (S310), the amplification gain of the amplification unit 10 can be automatically controlled according to the channel power of the transponder to be received S513).

3, when the channel power of the transponder scheduled to be received is equal to or greater than the average value or is out of the upper limit of the average range (S330), the broadcast signal amplification step S530 is performed. The attenuator 11 of the amplifying unit 10 can be operated (S530). Even when the attenuator 11 of the amplification unit 10 is operated, the amplification gain of the amplification unit 10 can be varied according to the channel power of the transponder to be received.

2 and / or 3, a tuning frequency channel corresponding to a channel of a transponder scheduled to be received from an RF broadcast signal amplified and output according to the comparison result is selected (step S700) S710). In the tuning and demodulating step S700, the output signal for the selected channel is demodulated (S730).

Next, a broadcast signal receiving method having a plurality of channels according to a fourth embodiment of the present invention will be described with reference to the drawings. Herein, examples of a broadcast signal receiving apparatus having a plurality of channels according to the second embodiment described above, examples of a broadcast signal receiving method having a plurality of channels according to the third embodiment, and FIGS. 1A, 2 and / or 3 , So that redundant descriptions may be omitted.

FIG. 4 is a flowchart schematically illustrating a method of receiving a broadcast signal having a plurality of channels according to another example of the present invention, FIG. 5 is a flowchart illustrating a method of receiving a broadcast signal having a plurality of channels according to another example of the present invention, Fig.

4 and / or 5, a broadcasting signal receiving method having a plurality of channels according to one example includes a channel power calculating step S1000, a channel power comparing step S3000, a broadcasting signal amplifying step S5000, And a demodulation step (S7000). The channel power calculating step S1000 and the tuning and demodulating step S7000 of each step are performed in the channel power calculating step S100, the tuning and demodulating step S700, and the demodulating step S700 of the broadcast signal receiving method having a plurality of channels according to the third embodiment. The present embodiment will be specifically described focusing on the channel power comparison step S3000 and the broadcast signal amplification step S5000 which are different from the third embodiment in the present embodiment. In this embodiment, the RF broadcast signal having a plurality of channels received by the tuner unit 30 may be a satellite broadcast signal, but is not limited thereto.

4 and / or 5, in the channel power calculation step (S1000), first, an overall transformer for all channels of an RF broadcast signal having a plurality of channels received by the tuner unit 30 through the amplifier unit 10, The ponders are scanned. In step S 1000, the channel power is calculated and stored for each transponder of the scanned transponders.

At this time, the calculation of the channel power for each transponder can be performed by using the control gain value applied when the RF broadcast signal scanned by all the transponders is amplified by the amplification unit 10. [

4 and / or 5, in the channel power comparison step S3000, S3100, S3300, and S3500, the maximum, minimum, or maximum channel power of all the transponders stored in the channel power calculation step S1000 And the channel power of the transponder to be received are compared with the minimum value.

4 and / or 5, in the broadcasting signal amplifying step S5000, the attenuator 11 and the amplifier 13 (FIG. 4) are controlled by the gain control unit 70 according to the comparison result in the channel power comparing step S3000 ) Is controlled to amplify the RF broadcast signal.

For example, referring to FIG. 5, in one example, in the channel power comparison step S3000, a difference between a maximum value of channel powers of all transponders and a channel power of a transponder to be received is grasped (S3100).

If the difference between the maximum channel power of all the transponders and the channel power of the transponder to be received is greater than the first level (S3110), the broadcasting signal amplifying step (S5100) The amplification gain of the amplification unit 10 may be varied according to the channel power of the transponder that is supposed to be received so that the attenuator 11 of the receiver 10 is not operated.

If the difference between the maximum value of the channel powers of all the transponders and the channel power of the transponder to be received is smaller than or equal to the second level (S3130), the broadcasting signal amplification step (S5100) The attenuator 11 of the amplifying unit 10 can be operated (S5130). At this time, the second level value is equal to or smaller than the first bevel value. Even when the attenuator 11 of the amplification unit 10 is operated, the amplification gain of the amplification unit 10 can be varied according to the channel power of the transponder to be received.

Referring to FIG. 5, in step S3300, a difference between a minimum value of channel powers of all transponders and a channel power of a transponder to be received is determined in step S3000.

If it is determined in step S3300 that the difference between the minimum channel power of all the transponders and the channel power of the transponder to be received is less than the third level in step S3310, The amplification gain of the amplification unit 10 may be varied according to the channel power of the transponder to be received so as to prevent the attenuator 11 of the receiver 10 from operating.

If it is determined in step S3300 that the difference between the minimum channel power of all transponders and the channel power of the transponder to be received is greater than or equal to the fourth level in step S3330, The attenuator 11 of the amplifying unit 10 can be operated (S5330). At this time, the value of the fourth level is equal to or greater than the value of the third bevel. At this time, even when the attenuator 11 of the amplification unit 10 is operated, the amplification gain of the amplification unit 10 can be varied according to the channel power of the transponder to be received.

5, in step S3000, the difference between the maximum and minimum values of the channel powers of all the transponders and the channel power of the transponder to be received is determined (S3500) .

At this time, if the difference from the maximum value in the channel power comparison step S3500 is greater than the difference from the minimum value or larger than the fifth level (S3510), in the broadcasting signal amplification step S5500, the attenuator 11 And the amplification gain of the amplification unit 10 may be varied according to the channel power of the transponder to be received (S5510).

If the difference between the channel power comparison step S3500 and the minimum value is greater than the difference between the minimum value and the maximum value or greater than the fifth level (S3530), the attenuator 11 of the amplification part 10 in the broadcasting signal amplification step S5500 (S5530). At this time, even when the attenuator 11 of the amplification unit 10 is operated, the amplification gain of the amplification unit 10 can be varied according to the channel power of the transponder to be received.

4 and / or 5, in the tuning and demodulating step S7000, a tuning frequency channel corresponding to a channel of the transponder to be received from the RF broadcast signal amplified and outputted according to the comparison result is selected (S7100 ). In the tuning and demodulating step S7000, the output signal for the selected channel is demodulated (S7300).

The foregoing embodiments and accompanying drawings are not intended to limit the scope of the present invention but to illustrate the present invention in order to facilitate understanding of the present invention by those skilled in the art. Embodiments in accordance with various combinations of the above-described configurations can also be implemented by those skilled in the art from the foregoing detailed description. Accordingly, various embodiments of the invention may be embodied in various forms without departing from the essential characteristics thereof, and the scope of the invention should be construed in accordance with the invention as set forth in the appended claims. Alternatives, and equivalents by those skilled in the art.

10: amplification unit 11: attenuator
13: amplifier 30: tuner unit
50: demodulation unit 70: gain control unit
131: LNA 133: RF VGA
135: Mixer 137: IF VGA

Claims (17)

An amplifying unit including an attenuator and an amplifier, amplifying an RF broadcast signal having a plurality of received channels according to gain control;
A tuner unit for receiving the RF broadcast signal output from the amplifying unit and tuning to a tuned frequency channel;
A demodulator for demodulating an output signal of the tuner unit, scanning all transponders for all channels of the RF broadcast signal received by the tuner unit, calculating and storing channel power for each transponder, And
And a gain controller for comparing an average value or average range of channel powers of the stored transponders with channel power of a transponder to be received, and controlling the amplifier according to the comparison result.
The method according to claim 1,
The gain control unit includes:
And to prevent the attenuator of the amplification unit from operating when the channel power of the transponder scheduled to be received is less than the average value or deviates from a lower limit of the average range,
Wherein the control unit operates the attenuator of the amplification unit when the channel power of the transponder scheduled to be received is equal to or higher than the average value or deviates from the upper limit of the average range.
The method of claim 2,
Wherein the gain control unit automatically controls the amplification gain of the amplification unit according to the channel power of the transponder scheduled to be received.
An amplifying unit including an attenuator and an amplifier, amplifying an RF broadcast signal having a plurality of received channels according to gain control;
A tuner unit for receiving the RF broadcast signal output from the amplifying unit and tuning to a tuned frequency channel;
A demodulator for demodulating an output signal of the tuner unit, scanning all transponders for all channels of the RF broadcast signal received by the tuner unit, calculating and storing channel power for each transponder, And
And a gain controller for comparing a maximum value, a minimum value, a maximum value and a minimum value of the channel powers of the stored transponders with a channel power of a transponder to be received, and controlling the amplification unit according to a result of the comparison. Signal receiving device.
The method of claim 4,
Wherein the gain control unit recognizes a difference between the maximum value and the channel power of the transponder to be received,
And controlling the amplification gain of the amplification unit to be automatically controlled according to the channel power of the transponder to be received, when the difference exceeds the first level,
Wherein the attenuator of the amplification unit is operated when the difference is equal to or smaller than a second level lower than or equal to the first bevel.
The method of claim 4,
Wherein the gain control unit recognizes a difference between the minimum value and the channel power of the transponder to be received,
And controlling the amplification gain of the amplification unit to be automatically controlled according to the channel power of the transponder to be received, when the difference is less than the third level,
And operates the attenuator of the amplification unit when the difference is equal to or greater than a fourth level equal to or greater than the third bevel.
The method of claim 4,
Wherein the gain control unit recognizes a difference between the maximum value and the minimum value and the channel power of the transponder to be received,
When the difference between the maximum value and the minimum value is greater than or equal to the fifth level, the attenuator of the amplifying unit is prevented from operating and the amplifying gain of the amplifying unit is varied according to the channel power of the receiving transponder, and,
And operates the attenuator of the amplification unit when the difference between the minimum value and the maximum value is greater than or equal to the difference between the minimum value and the maximum value.
The method according to any one of claims 1 to 7,
Wherein the calculation of the channel power for each transponder is performed using the control gain value applied when the RF broadcast signal scanned by all the transponders is amplified by the amplifying unit.
The method according to any one of claims 1 to 7,
Wherein the amplifier comprises a low noise amplifier,
Wherein the RF broadcast signal is a satellite broadcast signal.
A channel power calculating step of scanning all transponders for all the channels of the RF broadcast signal having a plurality of channels received by the tuner unit through the amplifying unit and calculating and storing channel power for each transponder;
A channel power comparing step of comparing an average value or average range of channel powers of the stored transponders with a channel power of a transponder to be received;
A broadcasting signal amplifying step of amplifying the RF broadcasting signal by controlling the amplifying unit including the attenuator and the amplifier in the gain control unit according to the comparison result; And
And a tuning and demodulating step of tuning a tuning frequency channel corresponding to the channel of the transponder scheduled to be received from the RF broadcasting signal amplified and outputted according to the comparison result and demodulating the output signal for the tuned channel A method for receiving broadcast signals having multiple channels.
The method of claim 10,
In the broadcasting signal amplifying step,
When the channel power of the transponder scheduled to be received is less than the average value or deviates from the lower limit of the average range, the attenuator of the amplifying unit is prevented from operating,
Wherein the attenuator of the amplifying unit is operated when the channel power of the transponder scheduled to be received is equal to or greater than the average value or deviates from the upper limit of the average range.
The method of claim 11,
Wherein the amplifying gain of the amplifying unit is varied according to the channel power of the transponder scheduled to be received in the broadcasting signal amplifying step to automatically control the amplifying gain of the amplifying unit.
A channel power calculating step of scanning all transponders for all the channels of the RF broadcast signal having a plurality of channels received by the tuner unit through the amplifying unit and calculating and storing channel power for each transponder;
Comparing a maximum value, a minimum value, a maximum value and a minimum value of the channel powers of the stored transponders with a channel power of a transponder to be received;
A broadcasting signal amplifying step of amplifying the RF broadcasting signal by controlling the amplifying unit including the attenuator and the amplifier in the gain control unit according to the comparison result; And
And a tuning and demodulating step of tuning a tuning frequency channel corresponding to the channel of the transponder scheduled to be received from the RF broadcasting signal amplified and outputted according to the comparison result and demodulating the output signal for the tuned channel A method for receiving broadcast signals having multiple channels.
14. The method of claim 13,
In the channel power comparison step, a difference between the maximum value and the channel power of the transponder to be received is grasped,
Wherein the amplifying step of the broadcasting signal amplifying step is performed such that the attenuator of the amplifying part is not operated when the difference exceeds the first level and the amplifying gain of the amplifying part is automatically controlled according to the channel power of the transponder to be received, And operating the attenuator of the amplification unit when the difference is equal to or smaller than a second level lower than or equal to the bevel.
14. The method of claim 13,
In the channel power comparison step, a difference between the minimum value and the channel power of the transponder to be received is grasped,
The amplification gain of the amplification unit is controlled according to the channel power of the transponder to be received so that the attenuator of the amplification unit is not operated when the difference is less than the third level, Wherein the attenuator of the amplifying unit is operated when the difference is equal to or greater than a fourth level greater than or equal to the first level.
14. The method of claim 13,
In the channel power comparing step, a difference between each of the maximum value and the minimum value and the channel power of the transponder to be received is grasped,
The broadcasting signal amplifying step may prevent the attenuator of the amplifying unit from operating when the difference between the maximum value and the minimum value is greater than or equal to the fifth level and the channel power of the amplifying unit Wherein the control unit operates the attenuator of the amplification unit when the difference between the minimum value and the maximum value is greater than or equal to the difference between the maximum value and the fifth level. .
The method according to any one of claims 10 to 16,
Wherein the calculation of the channel power for each transponder in the channel power calculation step is performed using the control gain value applied when the RF broadcast signal scanned by the transponders is amplified by the amplification unit. And transmitting the broadcast signal.
KR1020120125987A 2012-11-08 2012-11-08 Common mode filter and manufacturing method thereof KR102039950B1 (en)

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006024772A (en) 2004-07-08 2006-01-26 Murata Mfg Co Ltd Common mode noise filter
KR20120007350A (en) * 2010-07-14 2012-01-20 삼성전기주식회사 Satellite receiver for strong electric field and control method thereof

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006024772A (en) 2004-07-08 2006-01-26 Murata Mfg Co Ltd Common mode noise filter
KR20120007350A (en) * 2010-07-14 2012-01-20 삼성전기주식회사 Satellite receiver for strong electric field and control method thereof

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