JPH0550841U - Satellite broadcasting tuner - Google Patents

Abstract

(57) [Abstract] [Purpose] The present invention provides a drive voltage to the LNB even when the power switch is turned off.
It is an object of the present invention to provide a satellite broadcast receiving tuner capable of outputting a reception signal from an output terminal. [Structure] An output terminal 14 is connected to an input terminal 13 through a power feed switch 24, and when the power switch of the satellite broadcast receiving tuner 10 is off, the power feed switch is turned on so that the satellite broadcast reception is turned on. Configure a tuner for use.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a tuner for receiving satellite broadcasting, and in particular, distributes a received signal from an antenna and sends it to an antenna input terminal of another device such as a TV or VCR connected to an output terminal. It also relates to a tuner for receiving satellite broadcasting.

[0002]

[Prior Art]

 Conventionally, a satellite broadcast receiving tuner having such a distribution function is configured, for example, as shown in FIG. That is, in FIG. 5, the satellite broadcast receiving tuner 1 distributes a received signal to an output terminal connected to a television, a video deck, etc. and a tuner section, and a received signal from the distributor 2. It is composed of a tuner section 3 for tuning and detecting.

The distributor 2 has an input terminal 4 to which a received signal is input from an antenna (not shown) via the LNB, and an output terminal 5 to be connected to an input terminal of another device such as a television or a video deck. A band pass filter 6 for extracting a high frequency component of a received signal from the input terminal 4 via a capacitor, an amplifier 7 for amplifying an output signal of the band pass filter 6, and a signal from the amplifier 7 are provided. Attenuators 8 and 9 for attenuating, the distribution output of the attenuator 8 is connected to the tuner unit 3, and the distribution output of the other attenuator 9 is output to the output terminal 5 via the capacitor It is connected.

The tuner unit 3 is a tuner having a known structure for extracting a satellite broadcast video signal and an audio signal from a received signal from an antenna.

According to the satellite broadcast receiving tuner 1 configured as described above, the reception signal from the antenna is input from the input terminal 4 and then amplified by the amplifier 7 via the bandpass filter 6. , And further divided into two, and input to the tuner unit 3 and the output terminal 5 via the attenuators 8 and 9, respectively.

Therefore, the tuner unit 3 receives the received signal from the antenna and performs appropriate processing such as tuning and detection to extract the video signal and the audio signal of the satellite broadcast, and the output terminal 5 From, the received signal from the antenna is output as it is with almost no loss.

[0007]

[Problems to be solved by the device]

 However, in the satellite broadcast receiving tuner 1 configured as described above, the amplifier 7 of the distribution unit 2 is supplied with the voltage indicated by the symbol + B2 from the power supply unit (not shown) of the satellite broadcast receiving tuner 1. The LNB (not shown) connected to the input terminal 4 is operated by the drive voltage + B1 supplied to the input terminal 4 via the coil.

Therefore, when the tuner 1 for receiving satellite broadcast is not used, if the power switch is turned off, power cannot be supplied to the amplifier 7 and the LNB, so that the amplifier 7 and the LNB operate. Therefore, the reception signal from the antenna cannot be output from the output terminal 5, and the reception signal cannot be supplied to other devices such as a television and a video deck connected to the output terminal 5. become.

Therefore, even if the tuner 1 for receiving the satellite broadcast is not used, if the satellite broadcast is to be received by another television or VCR, the tuner 1 for receiving the satellite broadcast may be used. It was necessary to turn on the power switch, which was inconvenient and was not preferable in terms of power saving.

In view of the above points, the present invention makes it possible to output a reception signal from the output terminal by supplying the drive voltage to the LNB even when the power switch is turned off. The purpose is to provide a tuner for broadcasting reception.

[0011]

[Means for Solving the Problems]

 According to the present invention, the above object is to provide an input terminal to which a received signal is input from the antenna via the LNB, and an output terminal for connecting the received signal from the input terminal to an external device such as a television or a video deck. For satellite broadcasting reception, which comprises a distributor for distributing to the tuner and a tuner for tuning and detecting the reception signal from the distributor, and further applying an LNB drive voltage to the input terminal. In the tuner, the output terminal is connected to the input terminal via a power supply switch, and the power supply switch is turned on when the power switch of the satellite broadcast receiving tuner is off. Achieved by a tuner for receiving star broadcasts.

[0012]

[Action]

 According to the above configuration, when the power switch is on, the power supply switch is off, and the drive voltage is supplied from the power supply section of the tuner to the LNB connected to the input terminal via the input terminal. At the same time, when the power switch is off, the power switch is turned on, so that the LNB drive voltage supplied from the external device such as a TV or VCR connected to the output terminal via the output terminal is the power switch. Via the input terminal to the LNB.

Therefore, when the tuner is not used, even if the power switch of the tuner is turned off, the drive voltage can be supplied to the LNB, so that the received signal is input from the LNB to the input terminal. The received signal can be output from the output terminal to the outside via the distribution unit, and the received signal from the antenna can be input to the external device connected to the output terminal. Satellite broadcasting can be received by the external device.

[0014]

【Example】

 Hereinafter, the present invention will be described in detail with reference to the embodiments shown in the drawings. FIG. 1 shows an embodiment of a satellite broadcast receiving tuner according to the present invention.

The satellite broadcast receiving tuner 10 distributes a received signal to an output terminal connected to a television, a video deck, etc. and a tuner unit, like the conventional satellite broadcast receiving tuner 1 shown in FIG. The distribution unit 11 and a tuner unit 12 that tunes and detects a reception signal from the distribution unit 11.

The distribution unit 11 has an input terminal 13 to which a received signal is input from an antenna (not shown) via the LNB, and an output terminal 14 to be connected to an input terminal of another device such as a television or a video deck. A bandpass filter 15 for extracting a high frequency component of a received signal via a capacitor from the input terminal 13, an amplifier 16 for amplifying an output signal of the bandpass filter 15, and a signal from the amplifier 16 are provided. Each of the attenuators 17 and 18 is provided for attenuating.

The distribution output of the attenuator 17 is connected to the tuner section 12, and the distribution output of the other attenuator 18 is connected to the output terminal 14 via a capacitor.

Further, an LNB driving voltage + B1 is applied to the input terminal 13 from the terminal 19, and an amplifier 16 driving voltage + B2 is applied from the terminal 20.

The above-mentioned configuration is similar to that of the conventional satellite broadcast receiving tuner 1 shown in FIG. 5, but in the satellite broadcast receiving tuner 10 according to the present invention, the output terminal 14 is further provided. A terminal 21 is provided that is connected via a coil and connected to the amplifier 16 via a resistor. Between the terminals 20 and 21 and the amplifier 16, a diode 22 for preventing backflow is provided. , 23 are inserted.

As shown in the figure, a power feed switch 24 is connected to the terminals 19 and 21, and the power feed switch 24 is connected when the power switch of the tuner 10 is turned on. Although it is in the solid line position, it can be switched to the dotted line position when the power switch is off. The power supply switch 24 may be switched in conjunction with the power switch of the tuner 10 or may be manually switched.

The satellite broadcast receiving tuner 10 according to the present invention is configured as described above, and when the power switch of the tuner 10 is on, the LNB (not shown) is supplied with the drive voltage + B1 from the power supply unit. Power is supplied through the switch 24, and the driving voltage is supplied to the amplifier 16 from the terminal 20 through the diode 22.

As a result, the received signal from the antenna via the LNB is input from the input terminal 13, is then amplified by the amplifier 16 via the bandpass filter 15, and is further divided into two. , Is input to the tuner unit 12 and the output terminal 14 via the attenuators 17 and 18, respectively.

Therefore, the tuner unit 12 receives the received signal from the antenna, performs the appropriate processing such as tuning and detection, and extracts the video signal and the audio signal of the satellite broadcasting and also outputs the output terminal. From 14, the reception signal from the antenna is output.

Here, when the power switch of the tuner 10 is turned off, the power feeding switch 24 is correspondingly switched to the position of the dotted line, so that the LNB (not shown) is connected to the external terminal connected to the output terminal 14. The drive voltage from the device is supplied from the input terminal 13 from the terminal 21 via the power supply switch 24 and the terminal 19, and the drive voltage is supplied to the amplifier 16 from the output terminal 14 via the diode 23. .

As a result, the LNB and the amplifier 16 are operated, so that the reception signal from the antenna is output from the output terminal 14 as in the case where the power switch is turned on.

FIG. 2 shows another embodiment of the present invention, in which the amplifier 16 and its related components, namely the terminal 20 and the diodes 22, 23, are compared with the embodiment of FIG. The attenuators 17 and 18 are omitted, and the received signal input to the input terminal 13 is distributed by the distributor 25 without being amplified or attenuated and input to the tuner section 12 and the output terminal 14. When the tuner 10 is powered off, the drive voltage from the external device connected to the output terminal 14 is transmitted through the power supply switch 24 (not shown) connected to the terminals 19 and 21. The same applies to the LNB supplied from the input terminal 13.

FIG. 3 shows another embodiment of the present invention. In this case, as compared with the embodiment of FIG. 1, the attenuator 26 is inserted in the front stage of the amplifier 16 and the bandpass filter is provided. Since the filter 15 is inserted before the input to the tuner unit 12 after distribution and the terminal 21 and the power feeding switch 24 are omitted, the output terminal 14 is always connected to the input terminal 13. ing.

Further, FIG. 4 shows a further modified example, which is different from the embodiment of FIG. 3 in that a diode 27 for preventing backflow is inserted in the terminal 19.

In the embodiment shown in FIGS. 3 and 4, similarly, regardless of whether the power switch of the tuner 10 is turned on or off, the drive voltage from the external device connected to the output terminal 14 is applied to the input terminal 13 From the antenna to the LNB and then to the amplifier 16. Thus, the reception signal from the antenna is also output from the output terminal 14.

[0030]

[Effect of the device]

 As described above, according to the present invention, the received signal can be output from the output terminal by supplying the drive voltage to L NB even when the power switch is turned off, which is extremely excellent. Therefore, a tuner for receiving satellite broadcasting can 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 another embodiment of a satellite broadcast receiving tuner according to the present invention.

FIG. 3 is a block diagram showing another embodiment of the satellite broadcast receiving tuner according to the present invention.

FIG. 4 is a block diagram showing a modification of the satellite broadcast receiving tuner of FIG.

FIG. 5 is a block diagram showing an example of a conventional satellite broadcast receiving tuner.

[Explanation of symbols]

 10 Satellite Broadcast Tuner 11 Distribution Unit 12 Tuner Unit 13 Input Terminal 14 Output Terminal 15 Bandpass Filter 16 Amplifier 17, 18, 26 Attenuator 19, 20, 21 Terminal 22, 23 Diode 24 Feed Switch 25 Distributor

Claims (1)

[Scope of utility model registration request] 1. An input terminal to which a received signal is input from an antenna via an LNB, and a received signal from the input terminal is distributed to a tuner section and an output terminal connected to an external device such as a television or a video deck. In a satellite broadcast receiving tuner in which a LNB driving voltage is applied to the input terminal, the output terminal supplies power to the output terminal, which includes a distributor and a tuner that tunes and detects a signal received from the distributor. A satellite broadcast receiving tuner connected to the input terminal via a switch, wherein the power feeding switch is turned on when a power switch of the satellite broadcast receiving tuner is off.