JPH0670331U - Satellite broadcasting tuner - Google Patents

Abstract

(57) [Abstract] [Purpose] The present invention provides a received signal from an output terminal by supplying a drive voltage to an LNB even when a power switch of a device having a satellite broadcast receiving tuner is turned off. Provided is a tuner for receiving satellite broadcasting which can be output. [Structure] In a satellite broadcast receiving tuner including a distribution unit 21 and a tuner unit 3, a first power supply system for supplying power to an input terminal 4 and a booster unit 6 is connected to an output terminal 9 and an input terminal 4. And a second power supply system connected to the booster unit 6 and supplying a voltage to the input terminal 4 and the booster unit 6.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a satellite broadcast receiving tuner, and more particularly to an antenna input terminal of another device such as a television with a satellite broadcast receiving tuner connected to an output terminal for distributing a received signal from an antenna and a video deck. It is related to a satellite broadcasting tuner that was sent to

[0002]

[Prior art]

 Conventionally, a satellite broadcast receiving tuner 1 having such a distribution function is configured, for example, as shown in FIG. That is, in FIG. 2, a satellite broadcast receiving tuner 1 includes a distribution unit 2 that distributes a received signal to an output terminal 9 connected to a television with a satellite broadcast reception tuner, a VCR, etc. and a tuner unit 3, It comprises a tuner section 3 for tuning and detecting a received signal from the distributing section 2.

The distributor 2 is provided between an input terminal 4 to which a received signal is input from a parabolic antenna (not shown) via an LNB (low noise block) and capacitors C1 and C2 connected in series to the input terminal 4. The trap filter unit 5 is connected to the capacitor C3 and the coil L1 connected in series, and the other end of the coil L1 is connected to the ground, and the base of the NPN transistor Tr1 is connected to the other end of the capacitor C2. The emitter is connected to the ground, and the collector is connected to the booster power supply terminal 10 (input voltage 5V) via the resistor R1 and the coil L2. The contacts of the resistor R1 and the coil L2 and the base of the transistor Tr1 are connected. A booster section 6 made up of a resistor R2 connected in between, and a series connection of resistors R3 and R4 via a capacitor C3 and resistors R3 and R An external device attenuator portion 7 connected to the output terminal 9 via a capacitor C4 connected to the other end of the resistor R4, and also to the external device attenuator portion. 7 and a capacitor C3 connected in parallel with each other, which is composed of a series connection of resistors R6 and R7 and a resistor R8 connected between the contacts of the resistors R6 and R7 and the ground, and a capacitor C5 connected to the other end of the resistor R7. The tuner attenuator section 8 is connected to the tuner section 3 via the.

The input terminal 4 is further connected to an LNB power supply terminal 11 (input voltage 15V) via a coil L3, and power is supplied to the LNB of the parabolic antenna from a device incorporating the tuner 1 for satellite broadcast reception. Is intended to be supplied. The tuner unit 3 is a tuner having a known configuration for extracting a satellite broadcast video signal and an audio signal from a reception signal from the antenna.

According to the satellite broadcast receiving tuner 1 configured as described above, the received signal from the parabolic antenna is input from the input terminal 4, and thereafter, the unnecessary signal is cut by the trap filter unit 5, and the booster unit is cut. The signal is amplified by 6 and is further divided into two, which are input to the tuner section 3 and the output terminal 9 via the attenuator sections 7 and 8, respectively. Therefore, the tuner unit 3 receives the received signal from the antenna, performs the appropriate processing such as tuning and detection to extract the video signal and the audio signal of the satellite broadcast, and outputs from the output terminal 9 The received signal from the antenna is output as it is without loss.

[0006]

[Problems to be solved by the device]

 However, in the satellite broadcast receiving tuner 1 configured as described above, the booster section 6 is supplied with a voltage from the power source section (not shown) of the device incorporating the satellite broadcast receiving tuner 1 through the booster power supply terminal 10. The parabolic antenna LNB (not shown) connected to the input terminal 4 is also operated from the power source part of the above device via the LNB power terminal 11 and the coil L3. It is designed to operate from a voltage that is supplied to it.

Therefore, when the tuner 1 for receiving satellite broadcast is not used, if the power switch of the device is turned off, the booster unit 6 and the LNB cannot be supplied with power. Since the LNB and LNB do not operate, the output signal of the antenna cannot be output from the output terminal 9, and the output terminal 9 is connected to another device such as a television with a tuner for satellite broadcast reception and a VCR. In that case, the received signal cannot be supplied.

For this reason, even if the tuner 1 for receiving the satellite broadcast is not used, if the satellite broadcast is received by another TV or VCR equipped with a tuner for receiving the satellite broadcast, the satellite 1 Since it is necessary to turn on the power switch of the device having the broadcasting tuner 1 built therein, it is inconvenient and not preferable in terms of power saving.

In view of the above points, the present invention provides a drive voltage for the LNB even when the power switch of the device having the tuner for satellite broadcasting is turned off to receive the signal from the output terminal. It is an object of the present invention to provide a tuner for receiving satellite broadcasting, which can output signals.

[0010]

[Means for Solving the Problems]

 According to the present invention, there are provided an input terminal to which a received signal is input from an antenna via an LNB, a booster unit for amplifying a received signal input from the input terminal, and a received signal from the booster unit. In a satellite broadcast receiving tuner including a distribution unit that distributes to an output terminal and a tuner unit, and a tuner unit that tunes and detects a reception signal from the distribution unit, power is supplied to the input terminal and the booster unit. By having a first power supply system and a second power supply system that connects the output terminal and the input terminal and is connected to the booster section and supplies a voltage to the input terminal and the booster section. To be achieved.

[0011]

[Action]

 According to the above configuration, when the power switch of the device incorporating the satellite broadcasting tuner is turned on, the voltage is supplied from the power supply unit of the device to the LNB connected to the input terminal via the first power supply system. In addition to being supplied, the voltage is supplied from the external device connected to the output terminal to the booster unit and the LNB via the second power system when the power switch is off.

[0012]

【Example】

 Hereinafter, the present invention will be described in detail with reference to the embodiments shown in the drawings. The same reference numerals are given to the parts having the same configurations as the conventional ones. FIG. 1 shows an embodiment of a satellite broadcast receiving tuner according to the present invention.

The satellite broadcast receiving tuner 20, like the conventional satellite broadcast receiving tuner 1 shown in FIG. 2, outputs a received signal to an output terminal 9 connected to a television with a satellite broadcast receiving tuner, a VCR, or the like. And a tuner section 3 and a tuner section 3 for tuning and detecting a received signal from the distributor section 2.

The distribution unit 2 is provided between an input terminal 4 to which a reception signal is input from a parabolic antenna (not shown) via an LNB (low noise block) and capacitors C1 and C2 connected in series to the input terminal 4. The trap filter unit 5 is connected and is composed of a capacitor C3 and a coil L1 connected in series, and the other end of the coil L1 is connected to ground. The base of an NPN transistor Tr1 is connected to the other end of the capacitor C2. The emitter is connected to the ground, and the collector is connected to the booster power supply terminal 9 (input voltage 5V) via the resistor R1 and the coil L2. Between the contact of the resistor R1 and the coil L2 and the base of the transistor Tr1. A booster unit 6 made up of a resistor R2 connected in series, and a series connection of resistors R3 and R4 via a capacitor C3 and resistors R3 and R4. An external device attenuator section 7 connected to the output terminal 9 through a capacitor C4 connected to the other end of the resistor R4 and a resistor R5 connected between the contact and the ground, and the external device attenuator. A capacitor connected in parallel with the part 7 to the capacitor C3, including a series connection of the resistors R6 and R7 and a resistor R8 connected between the contacts of the resistors R6 and R7 and the ground, and connected to the other end of the resistor R7. The tuner attenuator section 8 is connected to the tuner section 3 via C5.

The input terminal 4 is further connected to the LNB power supply terminal 11 (input voltage 15V) via the coil L3, and power is supplied to the LNB of the parabolic antenna from a device incorporating the tuner 1 for receiving satellite broadcast. Is intended to be supplied.

The above-mentioned configuration is similar to that of the conventional satellite broadcast receiving tuner 1 shown in FIG. 2, but in the satellite broadcast receiving tuner 20 of the present invention, a coil is further provided to the output terminal 9. The voltage dividing resistor R9 is connected to the input terminal 4 via L4, and between the connection point between the output terminal 9 and the coil L4 and the respective contacts of the resistors R1, R2 and the coil L2.

The satellite broadcast receiving tuner 20 according to the present invention is configured as described above, and when the power switch of the device incorporating the satellite broadcast receiving tuner 20 is turned on, the satellite broadcast receiving tuner 20 is connected to the power source part of the device. The voltage is supplied to the booster unit 6 and the LNB. As a result, the received signal from the parabolic antenna is input from the input terminal 4, the unnecessary signal is cut by the trap filter unit 5, is amplified by the booster unit 6, and is further divided into two, and each is attenuator unit. The signal is input to the tuner section 3 and the output terminal 9 via 7 and 8. Therefore, the tuner unit 3 receives the received signal from the antenna, performs the appropriate processing such as tuning and detection to extract the video signal and the audio signal of the satellite broadcast, and outputs from the output terminal 9 The received signal from the antenna is output almost without loss.

Here, when the power switch of the device incorporating the satellite broadcast receiving tuner is turned off, the television with the satellite broadcast receiving tuner connected to the output terminal 9 and the output terminal 9 from the video deck to the coil A voltage is supplied to the LNB via the L4 and the input terminal 4, and a voltage is also supplied to the booster unit 6 via the output terminal 9 and the resistor R9. As a result, the LNB and the booster unit 6 are operated, so that the reception signal from the antenna is output from the output terminal 9 as when the power switch is turned on.

[0019]

[Effect of device]

 As described above, according to the present invention, even when the power switch is turned off, the received signal can be output from the output terminal by supplying the voltage to LNB, which is an extremely excellent satellite. A broadcast receiving tuner could be provided.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of a tuner for receiving satellite broadcasting according to the present invention.

FIG. 2 is a block diagram showing an example of a conventional satellite broadcast receiving tuner.

[Explanation of symbols]

 1,20 Satellite reception tuner 2,21 Distribution unit 3 Tuner unit 4 Input terminal 5 Trap filter unit 6 Booster unit 7,8 Attenuator unit 9 Output terminal 10 Booster power supply terminal 11 LNB power supply terminal R1 to R8 Resistance C1 to C5 capacitor L1 to L4 coils

Claims (1)

[Scope of utility model registration request] 1. An input terminal for receiving a received signal from an antenna via an LNB, a booster section for amplifying a received signal input from the input terminal, an output terminal for receiving the received signal from the booster section, and a tuner section. In a satellite broadcast receiving tuner comprising a distributor for distributing to and a tuner for tuning and detecting a signal received from the distributor, a first power supply system for supplying power to the input terminal and the booster unit. A second power supply system that connects the output terminal and the input terminal and that is connected to the booster section and supplies a voltage to the input terminal and the booster section. Tuner.