KR20150002278A - Method and apparatus for preventing signal interference in dual tuner - Google Patents

Method and apparatus for preventing signal interference in dual tuner Download PDF

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Publication number
KR20150002278A
KR20150002278A KR20130075903A KR20130075903A KR20150002278A KR 20150002278 A KR20150002278 A KR 20150002278A KR 20130075903 A KR20130075903 A KR 20130075903A KR 20130075903 A KR20130075903 A KR 20130075903A KR 20150002278 A KR20150002278 A KR 20150002278A
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South Korea
Prior art keywords
tuner
signal
packet identifier
dual
user
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KR20130075903A
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Korean (ko)
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KR102016624B1 (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
    • H04N5/50—Tuning indicators; Automatic tuning control
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/06—Receivers
    • H04B1/10—Means associated with receiver for limiting or suppressing noise or interference

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Multimedia (AREA)
  • Noise Elimination (AREA)
  • Circuits Of Receivers In General (AREA)

Abstract

A method for preventing signal interference in a dual tuner according to the present invention comprises the steps of: (A) extracting a packet identifier (PID) from a signal received by a first tuner; (B) determining whether the PID extracted in the step (A) is a PID of a channel selected by a user; and (C) reducing the intensity of a signal inputted to a second tuner when the PID extracted in the step (A) is not the PID of the channel selected by the user, thereby preventing signal interference in a dual tuner and watching one or two channels selected by the user with a clear definition without signal interference by respectively processing the signals received by the two tuners.

Description

[0001] The present invention relates to a method and apparatus for preventing signal interference in a dual tuner,

The present invention relates to a dual tuner that receives and processes signals from two antennas, and more particularly to a method and apparatus for preventing signal interference in a dual tuner.

The dual tuner is a tuner including two tuners capable of selecting two broadcast channels on one broadcast signal in a satellite broadcast receiver, or tuning each broadcast channel on different broadcast signals.

Since the dual tuner includes both the first tuner and the second tuner, when a high level signal is input to the first tuner and a low level signal is input to the second tuner, When the frequency and the symbol rate (symbol information) are the same, the signal of the first tuner is transmitted to the second tuner, so that the signal of the same channel as that of the first tuner can be received have. That is, when a high-level signal is input to one port, a high-level signal can be received at the other port due to interference with the other port. Therefore, when one input signal level is high, A different channel may be received and displayed on the screen.

The patent document described in the following prior art documents relates to a dual tuner applied to a satellite broadcast receiver that can remove the influence of a broadcast signal received by another antenna when a broadcast signal received by one antenna is used A dual tuner is applied to a satellite broadcast receiver that minimizes interference between a broadcast signal received by a first antenna and a broadcast signal received by a second antenna by stopping operation of another low noise amplifier and an attenuator when a dual path setting is required have.

However, the patent documents described in the following prior art documents have a problem that a signal received by one tuner can not be processed when a dual path is set.

Therefore, a method of preventing signal interference in a dual tuner that prevents signal interference in a dual tuner and processes the signals received from two tuners, respectively, so that one or two channels selected by the user can be viewed with clear image quality without signal interference And devices are required.

Korean Patent Publication No. 10-2012-0097870.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems of the prior art and it is an object of the present invention to provide a dual tuner capable of preventing signal interference, Or a dual tuner that allows two channels to be viewed with clear picture quality without signal interference.

Another problem to be solved by the present invention is to prevent signal interference in a dual tuner and to process a signal received from two tuners so that one or two channels selected by the user can be viewed in a clear image quality without signal interference And to provide a device for preventing signal interference in a dual tuner.

According to an aspect of the present invention, there is provided a method of preventing signal interference in a dual tuner,

(A) extracting a packet identifier (PID) from a signal received from a first tuner;

(B) determining whether the packet identifier extracted in the step (A) is a packet identifier of a channel selected by the user; And

(C) decreasing the intensity of a signal input to the second tuner when the packet identifier extracted in step (A) is not a packet identifier of a channel selected by the user.

The dual tuner includes a variable gain low noise amplifier for variably amplifying an input signal, and the step (C) includes the steps of: The amplification gain of the variable gain low noise amplifier included in the tuner can be reduced and the intensity of the signal input to the second tuner can be reduced.

In the method for preventing signal interference in a dual tuner according to an embodiment of the present invention, the steps (A), (B), and (C) (MPEG) chip that processes signals.

Also, in the method for preventing signal interference in the dual tuner according to the embodiment of the present invention, a signal received from the first tuner or the second tuner may include a transport stream (TS).

According to another aspect of the present invention, there is provided an apparatus for preventing signal interference in a dual tuner,

An apparatus for preventing signal interference in a dual tuner,

Means for extracting a packet identifier (PID) from a signal received from a first tuner;

Means for determining whether the extracted packet identifier is a packet identifier of a channel selected by the user; And

And means for outputting a control signal for decreasing the intensity of a signal input to the second tuner when the extracted packet identifier is not a packet identifier of a channel selected by the user.

In an apparatus for preventing signal interference in a dual tuner according to an embodiment of the present invention,

Wherein the dual tuner includes a variable gain low noise amplifier for variably amplifying an input signal, and the means for outputting a control signal for reducing the intensity of a signal input to the second tuner includes: It is possible to output a control signal for reducing the amplification gain of the variable amplification gain low noise amplifier.

In an apparatus for preventing signal interference in a dual tuner according to an embodiment of the present invention, the packet identifier extracting means, the packet identifier judging means, and the signal strength decreasing control signal outputting means may be constituted by the first tuner or the second tuner And may be included in an MPEG (MPEG) chip for processing a signal output from the tuner.

In addition, in an apparatus for preventing signal interference in a dual tuner according to an embodiment of the present invention, a signal received from the first tuner or the second tuner may include a transport stream (TS).

The features and advantages of the present invention will become more apparent from the following detailed description based on the accompanying drawings.

Prior to this, terms and words used in the present specification and claims should not be construed in a conventional and dictionary sense, and the inventor may appropriately define the concept of a term in order to best describe its invention The present invention should be construed in accordance with the spirit and scope of the present invention.

According to the present invention, it is possible to prevent signal interference in a dual tuner, and to process signals received from two tuners, respectively, so that one or two channels selected by the user can be viewed with clear picture quality without signal interference.

1 is a block diagram illustrating a dual tuner related apparatus to which a method of preventing signal interference in a dual tuner according to an embodiment of the present invention is applied.
2 is a flow diagram of a method for preventing signal interference in a dual tuner in accordance with an embodiment of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS The objectives, specific advantages and novel features of the present invention will become more apparent from the following detailed description taken in conjunction with the accompanying drawings, in which: FIG.

It should be noted that, in the present specification, the reference numerals are added to the constituent elements of the drawings, and the same constituent elements are assigned the same number as much as possible even if they are displayed on different drawings.

Also, terms such as " first, "" second," and the like are used to distinguish one element from another element, and the element is not limited thereto.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In the following description of the present invention, detailed description of related arts which may unnecessarily obscure the gist of the present invention will be omitted.

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

FIG. 1 is a block diagram illustrating a dual tuner related apparatus to which a method of preventing signal interference in a dual tuner according to an embodiment of the present invention is applied. FIG. 2 is a block diagram of a dual tuner according to an exemplary embodiment of the present invention. / RTI >

Hereinafter, a method and apparatus for preventing signal interference in a dual tuner according to an embodiment of the present invention will be described with reference to FIGS. 1 and 2. FIG.

Referring to FIG. 1, a dual tuner related apparatus to which a method of preventing signal interference in a dual tuner according to an embodiment of the present invention is applied includes a first antenna ANT1 for receiving a signal, a second antenna ANT1 for receiving a signal, A first tuner 100 for processing a received signal, a second antenna ANT2 for receiving a signal, a second tuner 110 for processing a signal received from a second antenna ANT2, And an MPEG (MPEG) chip 140 for processing signals output from the second tuner 110.

The first tuner 100 includes a first low noise amplifier (LNA) 120 for variably amplifying a signal received from the first antenna ANT1, a second low noise amplifier (LNA) 120 for amplifying a signal output from the first low noise amplifier A first RF processing unit 122 for performing RF processing and a first demodulating unit 124 for demodulating a signal output from the first RF processing unit 122.

The second tuner 110 includes a second low noise amplifier (LNA) 130 for variably amplifying the signal received from the second antenna ANT2, a second low noise amplifier (LNA) 130 for amplifying the signal output from the second low noise amplifier A second RF processor 132 for RF processing and a second demodulator 134 for demodulating the signal output from the second RF processor 132.

The MPEG chip 140 outputs a control signal to the first LNA 120 and the second LNA 130 and outputs the control signal to the first LNA 120 and the second LNA 120. [ The amplification gain of the second low noise amplifier (LNA) 130 can be adjusted.

A method of preventing signal interference in a dual tuner according to an embodiment of the present invention will now be described with reference to FIGS. 1 and 2. FIG.

FIG. 2 shows an embodiment in which a user selects one channel.

In step S20, the MPEG chip 140 extracts a packet identifier (PID) from a transport stream (TS) received from the first tuner 100 through the first antenna ANT1.

In step S22, the MPEG chip 140 determines whether the packet identifier extracted in step S20 is a packet identifier of a channel selected by the user. That is, in step S22, when the level of the signal received by the second tuner 110 is higher than the predetermined signal level, signal interference is caused to the first tuner 100 so that the signal of the second tuner 110 is transmitted to the first tuner 100). If the level of the signal received by the second tuner 110 is higher than the predetermined signal level and the signal of the second tuner 110 is transmitted to the first tuner 100, The signal of the same channel as that of the second tuner 110 can be received. Also, even if the frequency and symbol rate (symbol information) of the signal received by the first tuner 100 and the second tuner 110 are the same, the signal of the second tuner 110 is also transmitted to the first tuner 100 .

When the level of the signal received by the second tuner 110 is higher than a predetermined signal level and the signal of the second tuner 110 is transmitted to the first tuner 100, If a signal of the same channel as that of the second tuner 110 is received without receiving a channel signal, if the packet identifier is extracted from the transport stream output from the first tuner 100 and the channel information is confirmed, The packet identifier included in the transport stream output from the first tuner 100 is not a packet identifier of the channel selected by the user but a packet identifier corresponding to the channel of the signal induced in the second tuner 110. In this manner, in step S22, the packet identifier is extracted from the transport stream output from the tuner, and it is determined whether a signal corresponding to the channel selected by the user is processed in the corresponding tuner.

In step S24, when the packet identifier extracted in step S20 is not the packet identifier of the channel selected by the user, the MPEG chip 140 transmits a control signal (not shown) to the second low-noise amplifier 130 included in the second tuner 110, To reduce the amplification gain of the second low-noise amplifier 130, thereby reducing the intensity of the signal input to the second RF processor 132. [

In the present invention, if the level of the signal received by the second tuner 110 is higher than the predetermined signal level and the signal of the second tuner 110 is induced into the first tuner 100, The amplification gain of the second low noise amplifier 130 of the second tuner 110 is reduced so that the signal of the second tuner 110 is not induced into the first tuner 100. Therefore, the signal of the second tuner 110 is not transmitted to the first tuner 100 due to the decrease of the signal level by the second low noise amplifier 130, and the signal of the channel selected by the user is not transmitted to the first tuner 100 So that the user can clearly view the channel selected by the user without interfering with the signal.

Further, in the present invention, the amplification gain of the second low-noise amplifier 130 of the second tuner 110 is precisely adjusted so as not to cause signal interference, so that the signal level of the second tuner 110 is reduced Therefore, even when the user selects two channels, the user can clearly see both channels selected by the user without interrupting the operation of one tuner without interrupting the signal between the tuners.

On the other hand, when the MPEG chip 140 determines that the extracted packet identifier is the packet identifier of the channel selected by the user in step S22, the channel selected by the user is normally selected from the first tuner 100 and processed And performs normal signal processing. Accordingly, the user can normally view the channel selected by the user.

In an embodiment of the present invention, the MPEG chip 140 performs a method of preventing signal interference in the dual tuner shown in FIG. 2. However, the present invention is not limited to this, The first tuner 100 and the second tuner 110 receive the transport stream and extract a packet identifier and then transmit the transport stream to the first low noise amplifier 120 included in the first tuner 100 and the second tuner 110 ) Or the amplification gain of the second low-noise amplifier 130 may be reduced so as to prevent signal interference between the tuners.

The methods discussed herein may be implemented using various means, depending on the application. For example, these methods may be implemented in the form of hardware, firmware, software, or any combination thereof. In an implementation involving hardware, the control circuitry or control portion may comprise one or more application specific integrated circuits (ASICs), digital signal processors (DSPs), field programmable gate arrays (FPGAs), processors, , Microprocessors, electronic devices, other electronic units designed to perform the functions discussed herein, or a combination thereof.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments. It is clear that the present invention can be modified or improved.

It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the present invention as defined by the appended claims.

S20: Extracting the packet identifier (PID)
S22: Determining the packet identifier (PID)
S24: Amplification gain reduction step
S26: normal signal processing step

Claims (8)

(A) extracting a packet identifier (PID) from a signal received from a first tuner;
(B) determining whether the packet identifier extracted in the step (A) is a packet identifier of a channel selected by the user; And
(C) reducing a strength of a signal input to the second tuner when the packet identifier extracted in the step (A) is not a packet identifier of a channel selected by the user, Way. The dual tuner as claimed in claim 1, wherein the dual tuner includes a variable gain low noise amplifier for variably amplifying an input signal, and the step (C) includes a step of adjusting the gain of the variable gain low noise amplifier included in the second tuner To reduce the intensity of a signal input to the second tuner. The method of claim 1, wherein steps (A), (B) and (C)
(MPEG) chip for processing a signal output from the first tuner or the second tuner. The dual tuner of claim 1, wherein the signal received from the first tuner or the second tuner comprises a transport stream (TS). An apparatus for preventing signal interference in a dual tuner,
Means for extracting a packet identifier (PID) from a signal received from a first tuner;
Means for determining whether the extracted packet identifier is a packet identifier of a channel selected by the user; And
And means for outputting a control signal for decreasing the intensity of a signal input to the second tuner when the extracted packet identifier is not a packet identifier of a channel selected by the user. The dual tuner according to claim 5, wherein the dual tuner includes a variable gain low noise amplifier for variably amplifying an input signal, and the means for outputting a control signal for decreasing the intensity of a signal input to the second tuner comprises: And outputs a control signal for reducing the amplification gain of the variable gain low noise amplifier included in the second tuner. The apparatus of claim 5, wherein the packet identifier extracting means, the packet identifier determining means, and the signal strength reduction control signal outputting means are included in an MPEG (MPEG) chip for processing a signal output from the first tuner or the second tuner Wherein the dual tuner is configured to prevent signal interference. The dual tuner of claim 5, wherein the signal received from the first tuner or the second tuner includes a transport stream (TS).
KR1020130075903A 2013-06-28 2013-06-28 Method and apparatus for preventing signal interference in dual tuner KR102016624B1 (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20190080185A (en) * 2017-12-28 2019-07-08 한국정보통신기술협회 Intelligent Channel Blocking System and Method for Blocking Interference Channel in Terrestrial Digital TV Broadcasting

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009525700A (en) * 2006-02-02 2009-07-09 トムソン ライセンシング Method and apparatus for detecting and preventing crosstalk in multiple tuner receivers
KR20120097870A (en) 2011-02-25 2012-09-05 삼성전기주식회사 Dual tuner using for satellite broadcasting receiver

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009525700A (en) * 2006-02-02 2009-07-09 トムソン ライセンシング Method and apparatus for detecting and preventing crosstalk in multiple tuner receivers
KR20120097870A (en) 2011-02-25 2012-09-05 삼성전기주식회사 Dual tuner using for satellite broadcasting receiver

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20190080185A (en) * 2017-12-28 2019-07-08 한국정보통신기술협회 Intelligent Channel Blocking System and Method for Blocking Interference Channel in Terrestrial Digital TV Broadcasting

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