KR100736492B1 - Receiving control apparatus and method of broadcasting signal - Google Patents

Abstract

The present invention provides a broadcast signal, which is capable of detecting a reception state of a channel being viewed and improving channel reception by using one tuner not used in a broadcast reception device having two or more tuners. A reception control apparatus and method.

In accordance with another aspect of the present invention, a method for controlling broadcast signal reception includes: performing channel tuning using a first tuner unit; Checking whether the tuned broadcast channel signal is locked and whether there is a signal; Checking a signal reception state if the broadcast channel signal is not locked and a corresponding channel signal exists; Determining whether adjacent channel interference occurs by using an unused second tuner unit when the weak signal is received; When the interference of the adjacent channel is determined as a result of determining whether the adjacent channel is interference, changing the signal path for filtering the adjacent interference channel from the broadcast signal input to the first tuner unit.

Multiple Tuners, Adjacent Channels, Interference, RF Switches

Description

Receiving control apparatus and method of broadcasting signal

1 is a block diagram showing a conventional broadcast channel receiving apparatus.

2 is a block diagram showing a broadcast channel receiving apparatus according to an embodiment of the present invention.

Figure 3 is a detailed configuration diagram of the switch of the present invention Figure 2;

4 is a flowchart illustrating a broadcast channel reception method according to an embodiment of the present invention.

<Explanation of symbols for the main parts of the drawings>

100.Input source 110 ... Switch section

120,130 ... Signal processing section 121,131 ... Tuner section

122,132 ... IF processing section123,133 ... Digital demodulation section

140.Decoder section 150 ... Central processing section

111,112 ... splitter 113,114 ... tracking filter

115,116 ... switch

The present invention provides a broadcast signal, which is capable of detecting a reception state of a channel being viewed and improving channel reception by using one tuner not used in a broadcast reception device having two or more tuners. A reception control apparatus and method.

Recently, as digital broadcasting is accelerating, high quality and high quality broadcasting through satellite, terrestrial wave, cable, and network are being started. Compared to the existing analog TV, digital broadcasting provides not only high definition and high sound quality but also various additional services.

Digital broadcasting uses QPSK / VSB / QAM transmission method through existing satellite / ground / cable band by compressing high quality / high quality A / V using video / audio compression method (MPEG-2, AC-3). It can be delivered to each user, thereby providing a variety of services in one channel accordingly.

In the case of terrestrial waves, it is possible to provide more than 4 channels of SD grade and 1 channel of HD grade in one existing channel.In addition, digital TV transmits additional information together with A / V data to provide various services. By using this information, it is possible to provide a service such as a broadcast guide for an increased channel.

In recent years, a plurality of tuners may be used to configure multiple screens (PIP, POP, etc.) to search other channels while watching the main channel.

1 is a block diagram showing a conventional broadcast signal receiving apparatus.

Referring to FIG. 1, an input source 10, a switch unit 11 for selecting a broadcast signal received as an input source, a first tuner unit 12 for analog broadcast reception, and a digital broadcast reception A second tuner unit 22, first and second IF processors 13 and 23 for band filtering and amplifying the IF signals output from the first and second tuner units 12 and 22, and the IF signal. Control the first and second demodulators 14 and 24 to receive and demodulate respectively, a decoder 15 to decode the output of the first or second demodulators 14 and 14, and the respective units. This configuration includes a central processing unit (CPU) 15.

The conventional broadcast signal receiving apparatus as described above will be described with reference to FIG. 1.

Referring to FIG. 1, the conventional broadcast signal receiving apparatus selects and outputs a signal received from an input source 10 such as a terrestrial wave and a wired input by the switch unit 11. The signal selected and output by the switch unit 11 is transmitted to the first tuner 12 which is an analog broadcast reception tuner or the second tuner 22 which is a digital broadcast reception tuner.

That is, when a channel is set (or changed) by the user, the central processing unit 16 controls the switch unit 11 to select a broadcast signal input through an antenna or a cable.

The first tuner unit 12 or the second tuner unit 22 receiving the RF signal through the switch unit 11 converts the RF channel signal into an IF signal and outputs the first and second IF processors 13. 23 is for band filtering and amplifying the converted IF signal. The first tuner portion 12 is an NTSC tuner portion, and the second tuner portion 22 is a digital tuner portion.

The first or second demodulators 14 and 24 demodulate by band filtering and amplifying the IF processed signal. The A / V decoder 15 decodes only one broadcast channel signal input from the first or second demodulators 14 and 24. Here, the analog broadcast channel and the digital broadcast channel are moved according to separate signal paths, respectively, and are demodulated by the NSTC demodulator as the first demodulator or the digital demodulator as the second demodulator.

At this time, the digital demodulator 24 controls the IF AGC of the IF processor 13, and controls the RF AGC to the digital tuner 12 to perform gain adjustment on the selected channel. In addition, the central processing unit 16 is connected to the digital tuner unit 12 in serial communication to control channel selection and the like.

The A / V decoder 15 may decode only one channel at the same time, and may not support a function of decoding two digital broadcast signals at the same time.

In addition, when a digital broadcasting channel signal is received in a broadcasting channel environment in which a plurality of analog and digital broadcasting channel signals having different signal levels and signal states are mixed with the broadcasting channel, a bit error rate (BER) and a signal to noise ratio (SNR) of the demodulator are received. If the signal level and state of the incoming RF broadcast channel signal are within the processing input range of the receiver, the RF signal level state is 0.0Xe ^-6 , SNR is about 30dB, and the signal level is normal. When the signal is in the receiving state and the input channel signal is a weak signal, the BER is 1.0Xe ^-3 , the SNR is 16dB or less, the signal level is in the low (WEAK, BAD) signal receiving state, and the input channel signal is BER, SNR is low due to strong signal and strong co-channel signal or adjacent channel signal interference, there is a strong reception state where the signal level is high, or there is a special state that is not received.

Compared to other broadcast channel signals, if the selected broadcast channel signal is relatively weak or strong signal that is not received, or is interfered by adjacent channel signals, the selected broadcast channel signal is not properly processed through the tuner unit and the IF processing unit in the receiving device. There is a problem in that the audio and video data are broken or impossible to be received by being inputted to the demodulator in a distorted state or in a state in which the SNR ratio of the signal is not secured and thus not properly demodulated.

Against this background, a method for improving channel reception using an extra tuner in a broadcast signal receiving apparatus using two digital tuners is desired.

A first object of the present invention is to broadcast a signal to receive a broadcast channel signal using one or more tuners using two or more tuners, and determine the signal reception state for the broadcast channel signal using another tuner A signal receiving control apparatus and method are provided.

It is a second object of the present invention to provide a broadcast signal reception control apparatus and method for controlling a reception signal path according to a signal reception state for a broadcast channel signal determined using another tuner.

A third object of the present invention is to provide a plurality of receive signal paths to each tuner, and to include a filter for performing bandpass filtering on any one of the plurality of paths, and to filter the channel signal passing through the path. Disclosed is a broadcast signal reception control apparatus and method for improving a signal reception state due to adjacent channel interference.

A fourth object of the present invention is to provide a broadcast signal reception control apparatus and method comprising a plurality of received signal paths and filters configured in a switch unit.

Broadcast signal reception control apparatus according to the present invention for achieving the above object,

A first signal processing unit including a tuner unit, an IF processing unit, and a demodulation unit for tuning and IF processing and demodulating analog or digital broadcast signals;

A second signal processing section including a tuner section, an IF processing section, and a demodulation section for tuning an analog or digital broadcast signal and processing and demodulating the IF;

A decoder unit for A / V decoding the signal demodulated by the first and / or second signal processor;

A switch unit connected to each of the tuner units to transmit an input signal through a plurality of paths, the switch unit including a filter for removing adjacent channel interference in one of the plurality of paths;

And controlling the respective units, and including a central processing unit for controlling whether the filter passes through the switch unit according to the demodulated signal state of the broadcast channel signal.

Preferably, the central processing unit controls to reduce the level of the input signal through the filter of the switch unit when the synchronization signal of the broadcast channel signal is not locked and the channel signal is a strong signal.

Preferably, the central processing unit determines whether adjacent channel interference is performed by performing a background task using a tuner unit, an IF processor, and a demodulator of the first or second signal processor that is not used when the channel signal is not locked and is weak. It features.

Preferably, the central processing unit controls the input broadcast signal to pass through the filter path of the switch unit when adjacent channel interference occurs, thereby eliminating adjacent channel interference.

Preferably, the switch unit and a plurality of branching portions for each branching the signal input to the plurality of input terminals; A plurality of tracking filters for performing bandpass filtering on the signal branched by the branching unit; And a plurality of switches for selecting a signal filtered from the tracking filter or a first signal branched by the branching unit under control of a central processing unit, and outputting the selected signal to the tuner unit.

On the other hand, the broadcast signal reception control method according to the present invention,

Performing channel tuning using the first tuner unit; Checking whether the tuned broadcast channel signal is locked and whether there is a signal; Checking a signal reception state if the broadcast channel signal is not locked and a corresponding channel signal exists; Determining whether adjacent channel interference occurs by using an unused second tuner unit when the weak signal is received; When the interference of the adjacent channel is determined as a result of determining whether the adjacent channel is interference, changing the signal path for filtering the adjacent interference channel from the broadcast signal input to the first tuner unit.

The method may further include controlling to reduce a level of an input signal by changing a channel path of the RF switch unit when the synchronous lock is not performed and the corresponding channel signal reception state is a strong signal reception state.

Preferably, the adjacent channel interference is checked whether a signal level of an adjacent channel of the tuning channel exists through a second tuner unit, an IF processor, and a demodulator which are not used, and adjacent channel interference when a signal level is greater than or equal to a preset threshold. It is characterized by judging.

Preferably, the signal path includes a first path for bypassing an input source for each tuner section and a second path having a tracking filter for filtering adjacent interference channels, so that when an adjacent interference channel is generated, Characterized by passing through the second path.

Hereinafter, with reference to the accompanying drawings as follows.

2 is a block diagram illustrating a broadcast signal reception control apparatus according to an exemplary embodiment of the present invention, and FIG. 3 is a detailed block diagram of the switch unit of FIG. 2.

2, an input source 100 such as an antenna and a wired input, a switch unit 110 for selecting and outputting a broadcast signal received through the input source 100; A first signal processor (120) which tunes to the output of the switch unit (110), converts the signal into an intermediate frequency, and demodulates the digital signal; A second signal processor (130) which tunes to the output of the switch unit (110) and converts it into an intermediate frequency and demodulates it into a digital signal; A decoder unit (140) for decoding a signal demodulated by the first and / or second signal processor (120,130); It is a configuration that includes a central processing unit 150 for controlling each unit by a user's channel selection command.

The first signal processor 120 includes a first tuner 121, a first IF processor 122, and a first digital demodulator 123, and the second signal processor 130 includes a second tuner unit. 131, a second IF processing unit 132, and a second digital demodulation unit 133.

As shown in FIG. 3, the switch unit 110 is an RF switch unit, and is connected to at least two input terminals IN1 and IN2 to branch and output an input signal, and to output the first and second splitters 111 and 112. The first and second tracking filters 113 and 113 for performing band pass filtering on the outputs of the first and second splitters 111 and 112 and the control signal CTL of the central processing unit 150. And a first switch and a second switch (115, 116) for switching and outputting the input of the first and second tracking filters (113, 114) or the other signal branched by the splitters (111, 112).

Referring to the accompanying drawings, a broadcast signal reception control apparatus according to an embodiment of the present invention configured as described above is as follows.

Referring to FIG. 2, the switch unit 110 is an RF switch unit, which receives a broadcast signal input from two terrestrial waves, satellites, wires, and a network, which are input sources 100, by a channel selection command of the central processing unit 150. The output is selected by switching. That is, the switch unit 110 is configured in front of the plurality of tuner units 121 and 131 so that two broadcast signals can be simultaneously received. In addition, in the present invention, two broadcast signals that can be simultaneously received include two digital signals, one digital and analog signal, and two analog signals.

The broadcast signal selected by the switch unit 110 is input to the first signal processing unit 120 and / or the second signal processing unit 130, respectively, is converted into an intermediate frequency, demodulated, and output. The first signal processor 120 includes a first tuner 121, a first IF processor 122, and a first digital demodulator 123, and the second signal processor 130 includes a second tuner 131. ), A second IF processor 132, and a second digital demodulator 133.

The first or second tuner units 121 and 131 tune the channel desired by the user by channel channel selection data of the central processing unit 150, and amplify and convert the channel channel signal into an IF signal. In addition, the tuned channel signal is output by automatically adjusting the gain by the RF AGC signals of the digital demodulators 123 and 133. The first or second IF processor 122 or 132 band-filters and amplifies only a signal having a desired frequency band and outputs the selected channel IF signal as a gain adjusted signal by the IF AGC signal of the digital demodulator 123 and 133. . The first or second digital demodulators 123 and 133 digitally demodulate the IF-processed channel signal, and then gain control information (IF AGC,) of each IF processor 122,132 and tuner 121,131 according to the demodulated signal result. RF AGC). Here, the digital broadcast signal is checked in the demodulated signal and the digital data is transmitted to the decoder 140 if the digital signal exists.

The decoder 140 decodes the demodulated digital signals from the first and / or second digital demodulators 123 and 133. Since the decoder 140 is a dual A / V decoder capable of simultaneously decoding two digital input signals, one or more decoders Simultaneous decoding of the demodulated signal becomes possible.

The central processing unit 150 controls the switching unit 110 to control the input source 100 and the path selection, and receives the reception state information from the first and second digital demodulators 123 and 133 to perform serial communication (I2C). By performing the operation control of the first and second tuners 121 and 131 through the above, the channel reception is normally performed.

As described above, in the broadcast signal receiving apparatus having two or more digital tuners 121 and 131 and further including components (including an IF processor, an NTSC demodulator, etc.) capable of receiving at least an analog broadcast signal shown in FIG. When a broadcast channel signal to be received during broadcast reception is a strong signal or interference is generated by adjacent broadcast channel signals, the signal is not properly processed while passing through the tuner units 121 and 131 and the IF processor units 122 and 132 in the broadcast receiving apparatus. It may be input to the demodulators 123 and 133 in a distorted state. In addition, when the noise ratio (SNR) of the signal is input to the demodulators 123 and 133, the demodulators 123 and 133 do not demodulate normally, thereby causing problems such as audio / video cracking or video / audio reception. Occurred.

That is, the central processing unit 150 determines whether the synchronization information of the digital demodulators 123 and 133 is locked and checks the control information (AGC, SNR) values of the digital demodulators 123 and 133 if the lock is not performed. In the input structure of the demodulators 123 and 133, the gain is controlled (AGC, SNR) when a signal exists regardless of the digital and analog signals at the demodulator input stage, and the synchronization information is detected at the demodulator final stage.

However, the central processing unit 150 recognizes that when there is no actual signal when the final stage of the demodulator does not detect the synchronization information, the digital broadcast signal exists but the synchronization information of the signal input to the demodulator input terminal due to the adjacent channel interference. If it is impossible to obtain a problem. In this case, it is necessary to obtain control information (AGC, SNR) for the demodulator input terminal as a background task, and the background task checks the interference of the adjacent channel and changes the path to remove the interference. The background task is preferably performed concurrently with the foreground task.

In other words, the present invention uses the other tuner unit 121 or 131 not in use to determine the signal reception state of the input broadcast channel signal currently being received to the main, and according to the determination result is a strong signal or adjacent channel interference When the weak (BAD, WEAK) signal is received, the central processing unit 150 may change the received signal path.

Here, the unused tuner part is an unused tuner part of two or more tuner parts, or is blocked by the user when using both tuner parts (main tuner / sub tuner) with multiple screens (PIP, POP, etc.). Any one of the selected tuner units or the sub-tuner unit set in advance in the system can be blocked and used as an extra tuner unit.

In addition, when the central processing unit 150 passes the broadcast channel signal input from the switch unit 110 to the demodulators 123 and 133, a normal reception state, a bad reception state, and a strong state of the broadcast channel signal are performed. ) Detect the state by dividing it into the signal receiving state, and control the signal path of the switch unit 110 to reduce the level of the input signal if the strong signal receiving state, and if the weak signal receiving state checks adjacent channel interference When channel interference occurs, the signal path in the switch unit 110 may be switched to another path, that is, a path through which channel interference can be removed, so that adjacent channel interference can be eliminated.

3 is a detailed configuration diagram of the switch unit of FIG. 2.

 Referring to FIG. 3, the switch 110 includes first and second splitters 111 and 112, first and second tracking filters 113 and 114, and first and second connected to two input terminals IN1 and IN2, respectively. It includes a switch (115, 116), the first and second splitters (111, 112) is to branch the output broadcast signal to at least two paths to output. The first and second tracking filters 113 and 114 perform band pass filtering to pass only a specific band through the input broadcast signal. The first and second switches 115 and 116 control the broadcast signal branched by the first and second splitters 111 and 112 or the first and second tracking filters 113 and 114 under the control of the central processing unit 150 of FIG. 2. One signal from the passed signal is selected and output.

When the same signal is input to the two input terminals IN1 and IN2, two digital broadcasters, one analog broadcast, one digital broadcast, and two analog broadcasts may be simultaneously viewed using two tuners 121 and 131. have.

In addition, the broadcast signal output to the first output terminal OUT1 may be input to the first input terminal IN1 and the second input terminal IN2 by the switch unit 110, and is similarly output to the second output terminal OUT2. The broadcast signal may also be input to the first input terminal IN1 and the second input terminal IN2.

2 and 3, the first output terminal OUT1 is connected to the second tuner unit 131, and the second output terminal OUT2 is connected to the first tuner unit 121. Assuming that it is connected, the signal initially input to the first input terminal IN1 is selected (df) by the second switch unit 116 and output to the second output terminal (OUT2), thereby providing the first tuner unit 121. Through the broadcast channel signal can be received. At this time, the central processing unit 150 checks whether the synchronization information is not locked and the reception state of the signal is a strong reception or weak reception state. In the strong signal reception state, the signal path ef of the second switch 116 of the switch unit 110 is controlled to reduce the level of the input signal. In the weak signal reception state, the other tuner unit 121 determines whether adjacent channel interference exists. After judging through background task using), if adjacent channel (upper / lower channel of interference) interference occurs, it is possible to filter the adjacent channel which is the upper / lower channel of the current tuning channel based on the adjacent broadcast channel information. The signal path ef of the second switch 116 is controlled.

In this case, when the foreground task is operated by the IN1-second switch-first tuner unit, the background task may perform an adjacent channel of the broadcast channel signal received by the first tuner unit by the IN2-first switch-second tuner unit. The presence or absence of the signal and the signal level determine whether the adjacent channel interference.

If the adjacent channel interference occurs or a strong signal state, the broadcast signal inputted to the first tuner 121 passes through the second tracking filter 114, so that the signal passed through the first signal processor 120 is transmitted. Adjacent channel interference can be eliminated.

Here, the tracking filters 113 and 114 are electronically shifted to a type of band pass filter that tunes and passes only signals within a predetermined bandwidth (for example, 6 MHz) around a specific channel frequency and attenuates other signals. Filter. It also includes an attenuation feature that can reduce the signal level for strong signals.

The present invention may be designed in such a manner that the input terminals IN1-> IN2, IN2-> IN1 are changed when a strong signal or adjacent channel interference occurs, or the tuner unit may be changed. That is, the input terminal may have a path through which the path for fixing and eliminating the adjacent channel interference is passed from the IN1-second switch through the IN1-tracking filter-first switch to the second tuner unit. Similarly, the second tuner section can be changed in the same way. Accordingly, the control operation of the tuner unit is the same.

A broadcast signal reception control method according to the present invention will be described with reference to FIG. 4 as follows.

The channel N is tuned through the first tuner 1'st tuner (S101). At this time, the central processing unit sets the frequency data of the corresponding channel and the basic register for demodulating the first tuner unit and the demodulator unit through serial communication, and then checks the synchronous lock information of the digital and analog demodulator units (S102). ). At this time, if the synchronization information of the digital demodulator is locked, it is normally demodulated to decode and display the corresponding channel signal, and the received signal state is determined to be normal.

If the synchronization information is not locked to the analog and digital channels, the signal level and the signal noise ratio (SNR) of the corresponding channel are checked (S103), and the first tuner unit checks whether the corresponding channel signal is present (S104).

That is, as a result of the determination in S102, when the synchronization information of the digital demodulator cannot be locked, the control information (AGC, SNR, etc.) of the digital demodulator is checked to compare the synchronization information with the analog demodulator to determine whether there is an input digital broadcast signal. Here, if there is synchronization information of the analog demodulator, the input signal is recognized as an analog broadcast signal, and if there is no synchronization information of the analog signal, it is determined that digital and analog broadcast signals exist. For example, the broadcast channel information may determine whether digital or analog broadcast.

In addition, when the synchronization information is not locked in the digital demodulator, there are various causes according to the input signal and the signal state. When the first-input signal is the analog signal, the synchronization information of the analog demodulator (not shown) is used. It is possible to determine whether an analog signal is inputted, and even if the second-digital signal is input, the signal input level to the receiver may be affected by adjacent channel interference or the signal level is too low or too high. This is the case. In the second case, the AGC value of the digital demodulator reads the level of the input signal, and the noise ratio (SNR) value determines the digital signal.

Thereafter, if there is a signal of the corresponding channel (N) input to the first tuner unit, the state of the received signal is checked to check the strong signal reception state or the weak signal reception state (BAD) (S105).

As a result of the check, when the strong signal is received, the signal path of the RF switch unit is controlled (S108) to reduce the level of the input signal.

As a result of the check, if the BAD signal is received, the background task process using the second tuner unit which is not used is performed (S106). First, the adjacent channel of the received broadcast channel N using the second tuner unit ( Tuning is performed on the upper and lower channels of N-1, N + 1) and demodulation of the corresponding channel (S106-1). The presence or absence of a corresponding analog and digital signal is checked (S106-2), and if a signal exists, the corresponding channel information is stored (S106-3). Subsequently, after checking whether adjacent channel interference is performed using the stored adjacent channel information (S107), if it is determined that the adjacent channel interference is performed, the signal path of the RF switch unit is changed to a filter pass path (S108). These background task tasks occur concurrently with the foreground task tasks and are passed to the central processing unit for the foreground tasks.

In the above, whether the adjacent channel interference is determined based on the presence or absence of a signal and signal level information such as AGC and SNR is determined. If a signal exists and the signal level exceeds a predetermined threshold, it is considered as adjacent channel interference.

Here, the path control of the RF switch unit will be described with reference to the example of FIG. 3. If the reception path of the first tuner unit for the N channel is bypassed to IN1-second switch-OUT2, and the N-channel is not locked, the signal is adjacent to the adjacent path. If channel (N-1, N + 1) interference occurs, the path is changed to IN2-tracking filter-OUT2. In the case of a strong signal, the same path (IN2-tracking filter-OUT2) is changed. Since the input terminals IN1 and IN2 may be changed depending on which input source (cable, terrestrial wave, etc.) the user applies to which position, detailed description thereof will be omitted.

The tracking filter is a type of band pass filter that tunes and passes only signals within a predetermined bandwidth (for example, 6 MHz) around a specific channel frequency, and attenuates other signals. It also includes the ability to reduce signal attenuation for strong signals.

As such, a broadcast signal receiving apparatus capable of simultaneously receiving and decoding two broadcast signals can simultaneously decode two digital broadcast signals, thereby reducing the channel search and channel tuning time when the number of digital broadcast channels is large. In this case, problems such as broken A / V data due to adjacent broadcast channel interference or incapable reception can be solved. As another example of the present invention, the tracking filter may be configured inside the tuner section as well as the switch section.

So far, the present invention has been described with reference to the preferred embodiments, and those skilled in the art to which the present invention pertains to the detailed description of the present invention and other forms of embodiments within the essential technical scope of the present invention. Could be implemented. Here, the essential technical scope of the present invention is shown in the claims, and all differences within the equivalent range will be construed as being included in the present invention.

As described above, according to the broadcast signal reception control apparatus and method according to the present invention, by distinguishing adjacent channel interference when the strong signal or weak signal state as well as the weak signal according to the state of the channel received using two tuners For example, by changing the signal path to pass through the filter when the signal is strong or weak, the signal level can be reduced or adjacent channel interference can be prevented.

The present invention can solve problems such as broken A / V data due to adjacent broadcast channel interference or the inability to receive digital broadcast signals.

The present invention has the effect of improving the digital broadcast channel reception as a whole.

Claims (9)

A first signal processing unit including a tuner unit, an IF processing unit, and a demodulation unit for tuning and IF processing and demodulating analog or digital broadcast signals; A second signal processing section including a tuner section, an IF processing section, and a demodulation section for tuning an analog or digital broadcast signal and processing and demodulating the IF; A decoder for A / V decoding the demodulated signal in at least one of the first signal processor and the second signal processor; A switch unit connected to each of the tuner units to transmit an input signal through a plurality of paths, the switch unit including a filter for removing adjacent channel interference in one of the plurality of paths; And a central processing unit for controlling the respective units, and controlling a filter pass path of the switch unit in accordance with a demodulated signal state of a broadcast channel signal. The method of claim 1, And the central processing unit controls to reduce the level of the input signal through the filter of the switch unit if the synchronization signal of the broadcast channel signal is not locked and the channel signal is a strong signal. The method of claim 1, The central processing unit performs background tasks using a tuner unit, an IF processing unit, and a demodulator of the first or second signal processing unit that is not used when the channel signal is not locked and is weak, and determines whether adjacent channel interference occurs. Broadcast signal reception control device. The method of claim 1, And the central processing unit controls the input broadcast signal to pass through the filter path of the switch unit when adjacent channel interference occurs, thereby eliminating adjacent channel interference. The method of claim 1, The switch unit includes a plurality of branch units for branching the signals input to the plurality of input terminals, respectively; A plurality of tracking filters for performing bandpass filtering on the signal branched by the branching unit; And a plurality of switches for selecting a signal filtered from the tracking filter or a first signal branched by the branching unit under control of a central processing unit and outputting the first signal to the tuner unit. Performing channel tuning using the first tuner unit; Checking whether the tuned broadcast channel signal is locked and whether there is a signal; Checking a signal reception state if the broadcast channel signal is not locked and a corresponding channel signal exists; Determining whether adjacent channel interference occurs by using an unused second tuner unit when the weak signal is received; And determining a signal path for filtering the adjacent interference channel from the broadcast signal input to the first tuner unit when the interference of the adjacent channel occurs as a result of determining whether the adjacent channel is interference. Way. The method of claim 6, And controlling to reduce the level of the input signal by changing a channel path of the RF switch unit when the synchronization lock is not performed and the corresponding channel signal reception state is a strong signal reception state. The method of claim 6, Whether or not the adjacent channel interference is not checked by using a second tuner unit, an IF processor, and a demodulator whether the signal level of the adjacent channel of the tuning channel exists, and determining that the adjacent channel interference is present if the signal level is greater than or equal to a preset threshold. Broadcast signal reception control method, characterized in that. The method of claim 8, The signal path includes a first path for bypassing an input source for each tuner unit, and a second path having a tracking filter for filtering adjacent interference channels. Broadcast signal reception control method characterized in that to pass through the path.

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