KR100340437B1 - Rf module apparatus for set-top box - Google Patents

Abstract

The present invention relates to a high frequency module (RF module) device for a cable set-top box, the present invention relates to a set-top box including an RF modulation block 22 for modulating an audio / video signal into a television signal. A high frequency module device comprising: an RF input connector (RF-in) for connecting an RF cable; Distributes the received signal through the RF-in connector (RF-in) to two stages (one end: tuner side for cable modem, the other end: high pass filter side), and transmits the signal transmitted from the cable modem tuner to the RF input. A first signal splitter 21-1 provided to the connector RF-in; A first cable connector (CA-out1) for connecting the first signal splitter (21-1) and a cable modem tuner; A high pass filter (21-2) for blocking the low range included in the other end signal distributed by the first signal splitter (21-1) and passing the high range; A second signal distributor (21-4) for distributing the output signal of the high pass filter (21-2) to two stages (one end: the inner tuner side and the other end: the second amplifier side); A tuner connection terminal (int-out) for providing an end signal distributed by the second signal distributor 21-4 to a tuner in a high frequency module device for a set top box; A mixer 21-6 for mixing the output signal of the second signal splitter 21-4 and the signal of the RF modulation block 22; An RF output connector (RF-out) for outputting the output signal of the mixer 21-6 to a television; The present invention includes a switching block and an RF modulation block of a cable set-top box in a chassis and form a first cable connector, which is a connector for a cable modem tuner, to simplify signal line connection. As a result, matching characteristics and interference characteristics are improved, and productivity can be improved according to the complexity of components.

Description

High frequency module device for set top box {RF MODULE APPARATUS FOR SET-TOP BOX}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high frequency module (RF module) device for a cable set-top box. In particular, the switching block and the RF modulation block of the cable set-top box are incorporated in a chassis, and the cable modem tuner is installed in the chassis. The present invention relates to a high-frequency module device for a set-top box by forming a first cable connector, which is a connector for use, to improve matching characteristics and interference characteristics due to the simplification of signal line connections, and to improve productivity according to the complexity of components.

In general, cable and Internet set-top boxes adopted by foreign countries such as the United States can watch terrestrial, satellite, and Internet broadcasts through a single cable. A tuner that selects and tunes, a channel demodulator that demodulates the signal from the tuner and provides an A / V signal, and mixes the signal from the VTR, DVD and the like with the A / V signal from the channel demodulator to provide to the television. RF modulator is included.

FIG. 1 is an internal configuration diagram of a conventional set top box. Referring to FIG. 1, a conventional set top box includes a tuner 14, a channel demodulator 15, and an RF modulator 16 as described above. Each of the tuner 14, the channel demodulator 15, and the RF modulator 16 is individually manufactured as separate chassis, and the tuner 14, channel demodulator ( 15) and the RF modulator 16 is assembled to the main board of the set-top box. On the other hand, the set-top box includes a cable modem tuner 17.

FIG. 2 is a transmission and reception frequency band diagram of a set-top box. Referring to FIG. 2, transmission and reception frequency bands through a cable, for example, a frequency band of a reception signal includes terrestrial broadcasting, satellite broadcasting and internet broadcasting signals. 47MHz-860MHz, the frequency band of the transmission signal is 5MHz-42MHz including the signal provided by the cable modem tuner.

The transmission signal of the high power band 5MHz-42MHz is cut off by the first and second high pass filters 12 and 13 of FIG. 1 so that the tuner 14 and the RF modulator 16 have a first and second high pass. The pass filters 12 and 13 are not affected by the transmission signal.

FIG. 3 is a detailed view of the switching block of FIG. 1, and FIG. 4 is an external view of FIG. 3. Referring to FIGS. 3 and 4, in the conventional switching block, a signal received through a cable is obtained from the first amplifier 16a. The received signal through the first amplifier 16a is distributed in the divider 16b. One of the distribution signals is provided to the tuner, and the other distribution signal is amplified by the second amplifier 16c, and then mixed with the output signal of the modulator 16e by the mixer 16d and then the RF output connector ( Is provided to the television via RF-out.

However, the conventional set-top box is a tuner (14), channel demodulator (15), and RF modulator (16) are each built as a separate independent chassis, the connection between each component is complex, matching and interference characteristics There have been various problems such as lowering, lowering productivity due to separate manufacturing, and increasing production price accordingly.

In addition, the cable set-top box can not be connected to the tuner for a cable modem, it is not possible to utilize the function of the cable tuner, there was a problem that two-way communication is impossible using a conventional high-frequency module.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and therefore, an object of the present invention is to incorporate a switching block and an RF modulation block of a cable set-top box into a chassis, and the chassis is a connector for a cable modem tuner. It is to provide a high-frequency module device for a set-top box by forming a cable connector to improve the matching characteristics and interference characteristics due to the simplification of the signal line connection, and to improve the productivity according to the complexity of the components.

Another object of the present invention is to form a first cable connector, which is a connector for a cable modem tuner, in a chassis in which a switching block and an RF modulation block of a cable set-top box are incorporated, so that the cable modem tuner can be easily connected to enable two-way communication. It is to provide a high frequency module device for a set-top box.

1 is a block diagram of a conventional set-top box.

2 is a diagram illustrating transmission and reception frequency bands of a set-top box.

3 is a detailed view of the switching block of FIG. 1.

4 is an external view of FIG. 3.

5 is an external perspective view of the high frequency module device for a set-top box according to the present invention.

6 is an internal block diagram of FIG. 5.

FIG. 7 is a detailed view of a first embodiment of the switching block of FIG. 6.

8 is a detailed view of a second embodiment of the switching block of FIG.

9 is a detailed view of a third embodiment of the switching block of FIG. 6.

Explanation of symbols on the main parts of the drawings

20: high frequency module device for set top box 21, 31, 41: switching block

21-1,31-1,41-1: First signal divider 21-2,31-2,41-2: High pass filter

21-3,31-3,41-3: First amplifier 21-4,31-4,41-4: Second signal distributor

21-5: second amplifier 31-5, 41-5: first switch

41-7: second switch 22, 32, 42: RF modulation block

RF-in: RF-Input Connector RF-out: RF-Output Connector

CA-out1: 1st cable connector int-out: Tuner connection terminal

IOPC: I / O Pin Connector

As a technical means for achieving the above object of the present invention, the apparatus of the present invention is a high-frequency module device for a set-top box including an RF modulation block for modulating an audio / video signal into a television signal, the RF-cable connection RF-input connector for; Distributes the received signal through the RF-in connector (RF-in) to two stages (one end: tuner side for cable modem, the other end: high pass filter side), and transmits the signal transmitted from the cable modem tuner to the RF input. A first signal distributor provided to the connector; A first cable connector for connecting the first signal splitter and a cable modem tuner; A high pass filter for blocking a low range included in the other end signal distributed by the first signal splitter and passing a high range; A second signal distributor for distributing the output signal of the high pass filter to two stages (one stage: an internal tuner side and the other stage: a second amplifier side); A tuner connection terminal for providing a signal once distributed by the second signal distributor to a tuner in a high frequency module device for a set top box; A mixer for mixing the output signal of the second signal splitter and the signal of the RF modulation block; An RF output connector for outputting the output signal of the mixer to a television; Characterized in that it comprises a switching block comprising a.

Hereinafter, a high frequency module device for a set top box according to the present invention will be described in detail with reference to the accompanying drawings. In the drawings referred to in the present invention, components having substantially the same configuration and function will use the same reference numerals.

Briefly describing the present invention, the present invention basically simplifies the connection of a high frequency module (RF module) device for an NTSC or PAL cable set-top box, and improves matching and interference characteristics. A first cable connector is formed in an RF module device of the present invention to facilitate connection with a cable modem tuner for two-way communication.

First, FIG. 5 is an external perspective view of a high frequency module device for a set top box according to the present invention. Referring to FIG. 5, a cable is connected to an exterior of the high frequency module device for a set top box according to the present invention to receive a signal through a cable. RF-in connector (RF-in), the first cable connector (CA-out1) for providing the signal received through the cable to the cable modem tuner of the set-top box, and the cable tuner of the set-top box A tuner connection terminal (int-out) and an RF output connector (RF-out) for outputting a signal received through a cable to a television are provided. In addition, an input / output pin connector (IOPC) is formed on one side of the tube to connect with each corresponding external block.

In particular, the high-frequency module device for the set-top box is connected to the cable modem tuner through a first cable connector (CA-out1), the signal received through the cable is distributed through the first cable connector (CA-out1) It is provided as a tuner for a cable modem, and also receives a transmission signal from the tuner for a cable modem through a first cable connector CA-out1 and outputs it to an RF input connector RF-in. As described above, the internal circuit of the switching block 21 is configured to enable bidirectional communication through the first cable connector CA-out1. Therefore, the high-frequency module device for a set-top box according to the present invention can easily connect a tuner for a cable modem, thus making it easy to manufacture and assemble, thereby improving productivity and lowering a manufacturing cost.

FIG. 6 is an internal block diagram of FIG. 5. Referring to FIG. 6, the channel set device for a cable set-top box includes a first cable connector CA-out1 and a signal received through an RF input connector RF-in. A switching block 21 which is distributed to the tuner connection terminals CA-out1 and in-out, and which mixes the received signal and the RF modulated signal and outputs them through the RF output connector RF-out, and the switching block A tuner block 23 for tuning the signal distributed from 21, a channel demodulation block 24 for demodulating the signal from the tuner block 23, and an audio / video signal from the channel demodulation block 24; And an RF modulation block 22 for modulating the television signal.

The RF modulation block 22 is operated by being supplied with a voltage (VT) 30V, and is modulated into a television signal by receiving an audio / video signal (AUDIO / VIDEO) signal, a clock signal (SCL), and a data signal (SDA). do.

FIG. 7 is a detailed view of a first embodiment of the switching block of FIG. 6. Referring to FIG. 7, a switching block corresponding to the first embodiment of the present invention is an RF modulation block for modulating an audio / video signal into a television signal. Included in the high-frequency module device for a set-top box comprising a 42, the switching block 21 is an RF input connector (RF-in) for connecting the RF cable, and the RF input connector (RF-in) (B) distributing the received signal through two stages (one end: tuner side for cable modem, the other end: high pass filter side), and providing a transmission signal from a cable modem tuner to the RF input connector (RF-in). A first cable connector CA-out1 for connecting a first signal splitter 21-1, the first signal splitter 21-1, and a cable modem tuner, and the first signal splitter 21-1. A high pass filter 21-2 for cutting off the low range included in the other end signal distributed by A second signal divider 21-4 for distributing the output signal of the filter 21-2 to two stages (one end: the inner tuner side and the other end: the second amplifier side), and the second signal divider 21-4. Tuner connection terminal (int-out) for providing the signal once distributed by the tuner in the high frequency module device for set-top box, the output signal of the second signal distributor 21-4 and the signal of the RF modulation block 22; And a mixer 21-6 for mixing the signal, and an RF-out connector (RF-out) for outputting the output signal of the mixer 21-6 to the television.

The switching block 21 receives a booster power source BB +, amplifies a passing signal of the high pass filter 21-2, and provides the first signal 21-21 to the second signal distributor 21-4. 3) and a second amplifier 21-5 which receives the booster power source BB + and amplifies the other end signal distributed by the second signal splitter 21-4 to provide the mixer 21-6 to the mixer 21-6. It further includes.

FIG. 8 is a detailed view of a second embodiment of the switching block of FIG. 6. Referring to FIG. 7, a switching block corresponding to the first embodiment of the present invention is an RF modulation block for modulating an audio / video signal into a television signal. Included in the high-frequency module device for a set-top box comprising a 32, the switching block 31 is an RF input connector (RF-in) for connecting the RF cable, and the RF input connector (RF-in) (B) distributing the received signal through two stages (one end: tuner side for cable modem, the other end: high pass filter side), and providing a transmission signal from a cable modem tuner to the RF input connector (RF-in). A first cable connector (CA-out1) for connecting a first signal splitter (31-1), the first signal splitter (31-1), and a cable modem tuner, and the first signal splitter (31-1) A high pass filter 31-2 for cutting off the low range included in the other end signal distributed by A second signal divider 31-4 which distributes the output signal of the filter 31-2 to two stages (one stage: an internal tuner side and the other stage: a second amplifier side); and the second signal divider 31-4. Tuner connection terminal (int-out) for providing the signal once distributed by the tuner in the high frequency module device for set-top box, the output signal of the second signal distributor 31-4 and the signal of the RF modulation block 32; And a mixer 31-6 for mixing and an RF output connector (RF-out) for outputting the output signal of the mixer 31-6 to a television.

The switching block 31 receives a booster power source BB +, amplifies a pass signal of the high pass filter 31-2, and provides a first amplifier 31- to the second signal distributor 31-4. 3) and the output of the other end signal distributed by the second signal distributor 31-4 when the modulation power supply BB + is supplied, and the second signal distributor 31-4 when the modulation power source BB + is not supplied. And a switch 31-5 for providing the other end signal distributed by the multiplier to the mixer 31-6.

FIG. 9 is a detailed view of a third embodiment of the switching block of FIG. 6. Referring to FIG. 7, a switching block corresponding to the first embodiment of the present invention is an RF modulation block for modulating an audio / video signal into a television signal. It is included in the high-frequency module device for a set-top box comprising a 42, the switching block 41 is an RF input connector (RF-in) for connecting the RF cable, and the RF input connector (RF-in) (B) distributing the received signal through two stages (one end: tuner side for cable modem, the other end: high pass filter side), and providing a transmission signal from a cable modem tuner to the RF input connector (RF-in). A first cable connector (CA-out1) for connecting a first signal splitter (41-1), the first signal splitter (41-1), and a cable modem tuner, and the first signal splitter (41-1) A high pass filter (41-2) for cutting off the low range included in the other end signal distributed by;) and passing the high range, and the high pass A second signal divider 41-4 for distributing the output signal of the filter 41-2 to two stages (one end: the inner tuner side and the other end: the second amplifier side), and the second signal divider 41-4. Tuner connection terminal (int-out) for providing the signal once distributed by the tuner in the high frequency module device for set-top box, the output signal of the second signal distributor 41-4 and the signal of the RF modulation block 42 And a mixer 41-6 for mixing the signal, and an RF output connector (RF-out) for outputting the output signal of the mixer 31-6 to the television.

The switching block 21 receives a booster power source BB +, amplifies a pass signal of the high pass filter 41-2, and provides a first amplifier 41− to the second signal distributor 41-4. 3) and the output of the other end signal distributed by the second signal splitter 41-4 when the modulated power BB + is supplied, and the second signal splitter 41-4 when the modulated power BB + is not supplied. And a switch 41-5 for providing the other end signal distributed by the multiplier to the mixer 41-6.

Operation according to the present invention configured as described above will be described in detail below based on the accompanying drawings.

First, the switching block 21 corresponding to the first embodiment of the present invention will be described with reference to FIGS. 5, 6 and 7.

The switching block 21 according to the first embodiment of the present invention is included in a high frequency modulation device for a set-top box, in which the received signal through the RF input connector RF-in of the switching block 21 is divided into a first divider. After being divided into two stages by 21-1, the double signal distribution signal is provided to the cable modem tuner through the first cable connector CA-out1, and the first distributor 21-1 is connected to the cable modem. The transmission signal from the tuner is received through the first cable connector CA-out1 and provided to the RF-input connector RF-in.

The booster power source BB + is always supplied, and the modulation power source MB + is supplied when the operation of the RF modulation block 32 is required, and not supplied when the operation of the RF modulation block 32 is unnecessary.

First, when the modulation power source MB + is not supplied, the RF modulation block 22 does not operate, and the other end distribution signal distributed by the first divider 21-1 is a high pass filter 21-2. After passing through to the amplifier 21-3, the transmission signal from the cable modem tuner is blocked by the high pass filter 21-2 so that it is not provided to the first amplifier 21-3. This prevents crosstalk between the transmission and reception signals.

The first amplifier 21-3 and the second amplifier 21-5 operate by receiving a booster power source BB +, and the booster power source BB + is supplied from a booster power source unit (not shown). The power source BB + is controlled by a controller (not shown) of the set top box.

The first amplifier 21-3 amplifies the hand signal through the high pass filter 21-2, and the amplified signal is distributed in two stages in the second divider 21-4. Of these distribution signals, one distribution signal is provided to the internal tuner 23 through a tuner connection terminal (int-out), and the other distribution signal is amplified by the second amplifier 21-5 and then the mixer 21-6 and the RF. It is provided to the television via an output connector (RF-out).

On the other hand, when a modulation power supply MB + is supplied, the RF modulation block 32 operates to modulate an audio / video signal, which is then modulated by the mixer 31-6 and the RF output connector RF-. is provided through the TV.

Next, the switching block 31 corresponding to the second embodiment of the present invention will be described with reference to FIGS. 5, 6 and 8.

The operation of the switching block 31 corresponding to the second embodiment according to the present invention is the same as the operation of the switching block 21 according to the first embodiment of the present invention, that is, the operation up to the second distributor. Is omitted.

Among the signals distributed by the second divider 31-4 of the switching block 31 according to the second embodiment of the present invention, one distribution signal is provided to the internal tuner through a tuner connection terminal (int-out) and the other end. The distribution signal is provided to the switch 31-5.

The switch 31-5 operates by receiving control power CB +, and the control power CB + is supplied from a power supply unit (not shown). The booster power source BB +, the modulation power source MB + and the control power source CB + are controlled by a controller (not shown) of the set-top box, respectively.

In this regard, the booster power source BB + is always supplied, the modulation power source MB + and the control power source CB + are supplied when the operation of the RF modulation block 32 is required, and the operation of the RF modulation block 32 is performed. If this is unnecessary, do not supply.

If the modulation power source MB + and the control power source CB + are not supplied, the switch 31-5 is turned on. Accordingly, the RF modulation block 32 does not operate and the amplifier 31− 3) amplifies the hand signal through the high pass filter 31-2, and the amplified signal is distributed in two stages in the second divider 31-4. One of these distribution signals is provided to the cable tuner via a tuner connection intout, and the other distribution signal is passed through the switch 31-5 and then the mixer 31-6 and the RF output connector RF-. is provided through the TV.

On the other hand, when the modulation power source MB + and the control power source CB + are supplied, the switch 21-5 is turned off to disconnect the connection between the second distributor 31-4 and the mixer 31-6. In this case, the RF modulation block 32 is operated to modulate the audio / video signal, which is provided to the television through the mixer 31-6 and the RF-out connector (RF-out).

In this way, since the switch 31-5 is turned on / off depending on whether the modulation power source MB + and the control power source CB + are supplied, the output of the second signal distributor 31-4 and the RF modulation block 32 Since the interference between the output signals can be prevented, the output signal of the RF modulation block 32 can be improved.

Next, the switching block 41 corresponding to the third embodiment of the present invention will be described with reference to FIGS. 5, 6 and 9.

The description of the same parts as the operation of the switching block 31 corresponding to the second embodiment of the present invention described above will be omitted for the operation of the switching block 41 corresponding to the third embodiment according to the present invention.

If the modulation power source MB + and the control power source CB + are not supplied, the first switch 41-5 is turned on and the second switch 41-7 is turned off. Accordingly, the output signal of the RF modulation block 32 is cut off, and the amplifier 31-3 amplifies the received signal through the high pass filter 31-2, and the amplified signal is divided into the second divider 31. -4) in two stages. One of these distribution signals is provided to the cable tuner through the tuner connection intout, and the other distribution signal is passed through the first switch 31-5 and the mixer 31-6, and then the RF output connector ( Is provided to the television via RF-out.

On the other hand, when the modulation power source MB + and the control power source CB + are supplied, the first switch 41-5 is turned off and the second switch 41-7 is turned on. The first switch 41-5 cuts off the connection between the second distributor 31-4 and the mixer 31-6. At this time, the RF modulation block 32 operates to modulate an audio / video signal. This modulated signal is provided to the television via the second switch 41-7, mixer 31-6 and RF-out connector (RF-out).

In this way, since the first switch 41-5 and the second switch 41-7 operate on / off depending on whether the modulation power source MB + and the control power source CB + are supplied, the second signal distributor 31-4 Interference between the output of the RF modulation block 32 and the output signal of the RF modulation block 32 can be more reliably prevented, thereby improving the output signal of the RF modulation block 32.

The high frequency module device for a set top box according to the present invention described above is applicable to NTSC, PAL, SECOM.

According to the present invention as described above, the switching block and the RF modulation block of the cable set-top box in one chassis (chassis) to make a one-package (one package) at the same time, the first cable which is a connector for a cable modem tuner By forming the connector, matching characteristics and interference characteristics are improved due to the reduction of parts and the simplification of signal line connection, and the product price can be lowered to secure competitiveness, and the productivity can be improved by the combination of parts. It has a special effect.

Further, another effect of the present invention is to form a first cable connector, which is a cable modem tuner connector, in a chassis in which a switching block and an RF modulation block of a cable set-top box are incorporated, thereby enabling easy connection of a cable modem tuner. There is an effect that makes it possible.

The above description is only a description of one embodiment of the present invention, the present invention is capable of various changes and modifications within the scope of the configuration.

Claims (6)

A high frequency module apparatus for a set top box comprising an RF modulation block 22 for modulating an audio / video signal into a television signal, An RF input connector (RF-in) for connecting an RF cable; Distributes the received signal through the RF-in connector (RF-in) to two stages (one end: tuner side for cable modem, the other end: high pass filter side), and transmits the signal transmitted from the cable modem tuner to the RF input. A first signal splitter 21-1 provided to the connector RF-in; A first cable connector (CA-out1) for connecting the first signal splitter (21-1) and a cable modem tuner; A high pass filter (21-2) for blocking the low range included in the other end signal distributed by the first signal splitter (21-1) and passing the high range; A second signal distributor (21-4) for distributing the output signal of the high pass filter (21-2) to two stages (one end: the inner tuner side and the other end: the second amplifier side); A tuner connection terminal (int-out) for providing an end signal distributed by the second signal distributor 21-4 to a tuner in a high frequency module device for a set top box; A mixer 21-6 for mixing the output signal of the second signal splitter 21-4 and the signal of the RF modulation block 22; An RF output connector (RF-out) for outputting the output signal of the mixer 21-6 to a television; High-frequency module device for a set-top box, characterized in that it comprises a switching block 21 comprising a. The method of claim 1, wherein the switching block 21 is A first amplifier 21-3 receiving a booster power source BB + and amplifying a passing signal of the high pass filter 21-2 to provide it to the second signal splitter 21-4; A second amplifier 21-5 which is supplied with a booster power source BB + and amplifies the other end signal distributed by the second signal splitter 21-4 to the mixer 21-6; High frequency module device for set-top box characterized in that. In the high-frequency module device for a set-top box comprising an RF modulation block 32 for modulating an audio / video signal into a television signal, An RF input connector (RF-in) for connecting an RF cable; Distributes the received signal through the RF-in connector (RF-in) to two stages (one end: tuner side for cable modem, the other end: high pass filter side), and transmits the signal transmitted from the cable modem tuner to the RF input. A first signal splitter 31-1 provided to the connector RF-in; A first cable connector (CA-out1) for connecting the first signal splitter (31-1) and a cable modem tuner; A high pass filter 31-2 for blocking the low range included in the other end signal distributed by the first signal splitter 31-1 and passing the high range; A second signal distributor (31-4) for distributing the output signal of the high pass filter (31-2) to two stages (one end: the inner tuner side and the other end: the second amplifier side); A tuner connection terminal (int-out) for providing a signal once distributed by the second signal distributor (31-4) to a tuner in a high frequency module device for a set top box; A mixer (31-6) for mixing the output signal of the second signal splitter (31-4) and the signal of the RF modulation block (32); An RF output connector (RF-out) for outputting the output signal of the mixer (31-6) to a television; High-frequency module device for a set-top box, characterized in that it comprises a switching block 31 comprising a. The method of claim 1, wherein the switching block 31 A first amplifier 31-3 receiving a booster power source BB + and amplifying a passing signal of the high pass filter 31-2 to provide it to the second signal distributor 31-4; When the modulation power supply BB + is supplied, the output of the other end signal distributed by the second signal splitter 31-4 is cut off, and when the modulation power supply BB + is not supplied, the second signal splitter 31-4 is distributed. And a switch (31-5) for providing the other end signal to the mixer (31-6). In the high-frequency module device for a set-top box comprising an RF modulation block 42 for modulating an audio / video signal into a television signal, An RF input connector (RF-in) for connecting an RF cable; Distributes the received signal through the RF-in connector (RF-in) to two stages (one end: tuner side for cable modem, the other end: high pass filter side), and transmits the signal transmitted from the cable modem tuner to the RF input. A first signal splitter 41-1 provided to the connector RF-in; A first cable connector (CA-out1) for connecting the first signal splitter (41-1) and a cable modem tuner; A high pass filter (41-2) for blocking the low range included in the other end signal distributed by the first signal splitter (41-1) and passing the high range; A second signal divider (41-4) for distributing the output signal of the high pass filter (41-2) to two stages (one end: the inner tuner side and the other end: the second amplifier side); A tuner connection terminal (int-out) for providing an end signal distributed by the second signal distributor (41-4) to a tuner in a high frequency module device for a set top box; A mixer (41-6) for mixing the output signal of the second signal splitter (41-4) and the signal of the RF modulation block (42); An RF output connector (RF-out) for outputting the output signal of the mixer (31-6) to a television; High-frequency module device for a set-top box, characterized in that it comprises a switching block 31 comprising a. The method of claim 1, wherein the switching block 21 is A first amplifier 41-3 receiving a booster power source BB + and amplifying a passing signal of the high pass filter 41-2 to provide it to the second signal splitter 41-4; When the modulation power supply BB + is supplied, the output of the other end signal distributed by the second signal splitter 41-4 is cut off, and when the modulation power supply BB + is not supplied, the second signal splitter 41-4 is distributed. High frequency module device for a set-top box, characterized in that it further comprises; switch (41-5) for providing the other end signal to the mixer (41-6).