KR102016624B1 - 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
KR102016624B1
KR102016624B1 KR1020130075903A KR20130075903A KR102016624B1 KR 102016624 B1 KR102016624 B1 KR 102016624B1 KR 1020130075903 A KR1020130075903 A KR 1020130075903A KR 20130075903 A KR20130075903 A KR 20130075903A KR 102016624 B1 KR102016624 B1 KR 102016624B1
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South Korea
Prior art keywords
tuner
signal
packet identifier
dual
user
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KR1020130075903A
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Korean (ko)
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KR20150002278A (en
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김태훈
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주식회사 솔루엠
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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

Abstract

A method for preventing signal interference in a dual tuner according to the present invention includes: (A) extracting a packet identifier (PID) from a signal received from a first tuner; (B) determining whether the packet identifier extracted in step (A) is a packet identifier of a channel selected by a user; And (C) reducing the strength of the signal input to the second tuner when the packet identifier extracted in step (A) is not the packet identifier of the channel selected by the user. In addition, by processing the signals received from the two tuners respectively, one or two channels selected by the user can be seen in clear image quality without signal interference.

Description

Method and apparatus for preventing signal interference in dual tuner

The present invention relates to a dual tuner for receiving and processing 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 tuning both broadcast channels to one broadcast signal at a satellite broadcast receiver or tuning each broadcast channel to different broadcast signals.

Since the dual tuner includes a first tuner and a second tuner, when a high level signal is input to the first tuner and a low level signal is input to the second tuner, or when the first tuner and the second tuner If the frequency and symbol rate (symbol information) are the same, the signal of the first tuner is induced to the second tuner so that the signal of the channel desired by the user is not received from the second tuner, and the signal of the same channel as the first tuner may be received. have. In other words, when a high level signal is input to one port, the other port may interfere and a high level signal may be received at the other port. Other channels may be received and displayed on the screen.

The patent document described in the following prior art document relates to a dual tuner applied to a satellite broadcast receiver capable of removing influence from a broadcast signal received from another antenna when using a broadcast signal received from one antenna. If a dual path configuration is required, the dual tuner is applied to a satellite broadcast receiver which minimizes the interference between the broadcast signal received from the first antenna and the broadcast signal received from the second antenna by stopping the operation of other low noise amplifiers and attenuators. have.

However, the patent document described in the following prior art document, there is a problem that can not process the signal received in one tuner when setting the dual path.

Thus, a method of preventing signal interference in a dual tuner that prevents signal interference from the dual tuner while processing the signals received from the two tuners, so that one or two channels selected by the user can be seen in clear image without signal interference. And apparatus.

Republic of Korea Patent Publication No. 10-2012-0097870.

The present invention was created to solve the above-mentioned problems of the prior art, and the problem to be solved by the present invention is one selected by a user by processing signals received from two tuners while preventing signal interference in a dual tuner. Alternatively, it provides a method of preventing signal interference in a dual tuner that allows two channels to be seen in clear image quality without signal interference.

In addition, another problem to be solved by the present invention, while preventing signal interference in the dual tuner, by processing the signals received from the two tuners respectively so that one or two channels selected by the user can be seen in clear picture quality without signal interference To provide a device for preventing signal interference in the dual tuner.

Method for preventing signal interference in a dual tuner according to an embodiment of the present invention for solving the above problems,

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

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

(C) if the packet identifier extracted in step (A) is not the packet identifier of the channel selected by the user, reducing the strength of the signal input to the second tuner.

In the method for preventing signal interference in a dual tuner according to an embodiment of the present invention, the dual tuner includes a variable amplification gain low noise amplifier for amplifying the input signal variably, the step (C), the second By reducing the amplification gain of the variable amplification low noise amplifier included in the tuner, it is possible to reduce the strength of the signal input to the second tuner.

In addition, in the method of preventing signal interference in the dual tuner according to an embodiment of the present invention, the step (A), step (B) and step (C) are output from the first tuner or the second tuner It can be performed by an MPEG chip that processes the signal.

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

An apparatus for preventing signal interference in a dual tuner according to an embodiment of the present invention for solving the other problem,

A device for preventing signal interference in a dual tuner,

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

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

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

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

The dual tuners each include a variable amplification gain low noise amplifier for variably amplifying the input signal, and the means for outputting a control signal for reducing the strength of the signal input to the second tuner is included in the second tuner. It is possible to output a control signal which reduces the amplification gain of the variable amplification low noise amplifier.

In the 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 determining means and the signal strength reduction control signal output means may be the first tuner or the second tuner. It may be included in an MPEG chip that processes a signal output from the tuner.

In addition, in the apparatus for preventing signal interference in the dual tuner according to an embodiment of the present invention, the 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, the terms or words used in this specification and claims should not be interpreted in their ordinary and dictionary meanings, and the inventors will be required to properly define the concepts of terms in order to best describe their own invention. On the basis of the principle that it can be interpreted as meaning and concept corresponding to the technical idea of the present invention.

According to the present invention, while preventing signal interference in the dual tuner, by processing the signals received from the two tuners respectively, one or two channels selected by the user can be seen in clear image quality without signal interference.

1 is a block diagram illustrating a dual tuner related device to which a method for preventing signal interference in a dual tuner according to an embodiment of the present invention is applied.
2 is a flowchart of a method for preventing signal interference in a dual tuner according to an 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, terms such as “first” and “second” are used to distinguish one component from another component, and a component is not limited by the terms.

In the following description, detailed descriptions of related well-known techniques that may unnecessarily obscure the subject matter 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.

1 is a block diagram illustrating a dual tuner related apparatus to which a method for preventing signal interference in a dual tuner according to an embodiment of the present invention is applied, and FIG. 2 is a signal interference in a dual tuner according to an embodiment of the present invention. Flowchart of how to prevent.

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

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

On the other hand, the first tuner 100 is a first low noise amplifier (LNA) 120 to amplify the signal received from the first antenna (ANT1), the signal output from the first low noise amplifier (LNA) 120 A first RF processor 122 for RF processing and a first demodulator 124 for demodulating the signal output from the first RF processor 122.

In addition, the second tuner 110 may convert the signal output from the second low noise amplifier (LNA) 130 and the second low noise amplifier (LNA) 130 to variably amplify the signal received from the second antenna ANT2. 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 low noise amplifier (LNA) 120 and the second low noise amplifier (LNA) 130 to communicate with the first low noise amplifier (LNA) 120. Amplification gains of the second low noise amplifier (LNA) 130 may be adjusted.

1 and 2, a method of preventing signal interference in a dual tuner according to an embodiment of the present invention will be described.

2 illustrates an embodiment when a user selects one channel.

In operation 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 the packet identifier of the 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 occurs in the first tuner 100, so that the signal of the second tuner 110 becomes the first tuner ( It is judged whether it is abandoned in 100). If the signal of the second tuner 110 is induced to the first tuner 100 because the level of the signal received from the second tuner 110 is higher than the predetermined signal level, the channel selected by the user is selected by the first tuner 100. A signal of the same channel as the second tuner 110 may be received without receiving a signal of. In addition, even when the frequency and symbol rate (symbol information) of the signals received by the first tuner 100 and the second tuner 110 are the same, the signal of the second tuner 110 may be induced to the first tuner 100. Can be.

As such, since the level of the signal received by the second tuner 110 is higher than the predetermined signal level, the signal of the second tuner 110 is induced to the first tuner 100 so that the user selects the first tuner 100. When the channel signal is not received and a signal of the same channel as the second tuner 110 is received, when the channel identifier is extracted from the transport stream output from the first tuner 100 and the channel information is checked, the first tuner The packet identifier included in the transport stream output from 100 will be extracted from the packet identifier corresponding to the channel of the signal released by the second tuner 110, not the packet identifier of the channel selected by the user. As described above, in step S22, the packet identifier is extracted from the transport stream output from the tuner to determine whether a signal corresponding to the channel selected by the user is being processed in the tuner.

In step S24, the MPEG chip 140 transmits a control signal to the second low noise amplifier 130 included in the second tuner 110 when the packet identifier extracted in step S20 is not the packet identifier of the channel selected by the user. The output power is reduced to reduce the amplification gain of the second low noise amplifier 130, thereby reducing the strength of the signal input to the second RF processor 132.

In the present invention, if the level of the signal received at the second tuner 110 is higher than the predetermined signal level, the signal of the second tuner 110 is induced to the first tuner 100 so as not to cause signal interference. 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 to the first tuner 100. Accordingly, the signal of the second tuner 110 is reduced by the second low noise amplifier 130 and is not induced to the first tuner 100. In the first tuner 100, the signal of the channel selected by the user is As a result, the user can clearly see the channel of his choice without signal interference.

In addition, in the present invention, the signal level of the second tuner 110 is reduced so that there is no signal interference between the tuners by precisely adjusting the amplification gain of the second low noise amplifier 130 of the second tuner 110 so as not to cause signal interference. Therefore, even when the user selects two channels, the user can clearly see both channels selected by the user without signal interference between the tuners without stopping the operation of one tuner.

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, in step S26, the channel selected by the user is normally tuned by the first tuner 100 and processed. It judges that it is, and performs normal signal processing. Therefore, the user can normally view the channel selected by the user.

In an embodiment of the present invention, although the MPEG chip 140 is illustrated as performing a method of preventing signal interference in the dual tuner shown in FIG. 2, the present invention is not limited thereto, and the present invention is not limited thereto. The first low noise amplifier 120 included in the first tuner 100 and the second tuner 110 after receiving the transport stream from the first tuner 100 and the second tuner 110 and extracting the packet identifier. Alternatively, the amplification gain of the second low noise amplifier 130 may be reduced 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 circuit or controller may include one or more application specific integrated circuits (ASICs), digital signal processors (DSPs), field programmable gate arrays (FPGAs), processors, controllers, micro-controllers. Or microelectronics, electronic devices, other electronic units designed to perform the functions discussed herein, or a combination thereof.

Although the present invention has been described in detail with reference to specific examples, it is intended to specifically describe the present invention, and the present invention is not limited thereto, and a person skilled in the art within the technical idea of the present invention. It will be clear that the modification and improvement are possible by this.

All modifications and variations of the present invention fall within the scope of the present invention, and the specific scope of protection of the present invention will be apparent from the appended claims.

S20: packet identifier (PID) extraction step
S22: Packet identifier (PID) determination step
S24: amplification gain reduction step
S26: normal signal processing step

Claims (8)

(A) extracting a packet identifier (PID) from a signal received from the first tuner;
(B) determining whether the packet identifier extracted in step (A) is a packet identifier of a channel selected by a user; And
(C) if the packet identifier extracted in the step (A) is not the packet identifier of the channel selected by the user, reducing the strength of the signal input to the second tuner. Way. The method of claim 1, wherein the dual tuner includes a variable amplification gain low noise amplifier for amplifying the input signal variably, and step (C), the amplification gain of the variable amplification low noise amplifier included in the second tuner Reducing the strength of the signal input to the second tuner. The method of claim 1, wherein step (A), step (B) and step (C)
Method of preventing signal interference in the dual tuner, characterized in that performed by an MPEG (MPEG) chip for processing the signal output from the first tuner or the second tuner. The method of claim 1, wherein the signal received from the first tuner or the second tuner comprises a transport stream (TS). A device for preventing signal interference in a dual tuner,
Means for extracting a packet identifier (PID) from a signal received from the first tuner;
Means for determining whether the extracted packet identifier is a packet identifier of a channel selected by a user; And
And means for outputting a control signal for reducing the strength of a signal input to a second tuner when the extracted packet identifier is not a packet identifier of a channel selected by a user. The apparatus of claim 5, wherein each of the dual tuners includes a variable amplification gain low noise amplifier for variably amplifying an input signal, and the means for outputting a control signal for reducing the strength of a signal input to the second tuner comprises: And a control signal for reducing the amplification gain of the variable amplification low noise amplifier included in the second tuner. The MPEG chip according to claim 5, wherein the packet identifier extracting means, the packet identifier determining means, and the signal strength reduction control signal output means are included in an MPEG chip for processing a signal output from the first tuner or the second tuner. Apparatus for preventing signal interference in a dual tuner, characterized in that the. 6. The apparatus of claim 5, wherein the signal received from the first tuner or the second tuner comprises 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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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

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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

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