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Composite tuner capable of preventing mutual interference between terrestrial broadcast and satellite broadcast

A satellite broadcasting and tuner technology, applied in the field of satellite and ground wave composite tuners, can solve problems such as interference signal quality and deterioration, achieve good reception characteristics, prevent radiation, and reduce power consumption.

Inactive Publication Date: 2009-08-12
SHARP KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] In a receiver capable of receiving multiple broadcast signals with different frequency bands, it is necessary to prevent one broadcast signal from interfering with the other broadcast signal and deteriorating the signal quality

Method used

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  • Composite tuner capable of preventing mutual interference between terrestrial broadcast and satellite broadcast
  • Composite tuner capable of preventing mutual interference between terrestrial broadcast and satellite broadcast
  • Composite tuner capable of preventing mutual interference between terrestrial broadcast and satellite broadcast

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] figure 1 It is a block diagram showing the basic configuration of the composite satellite and terrestrial wave tuner 1 according to the present invention.

[0032] refer to figure 1 , The basic structure of the satellite and terrestrial composite tuner 1 is to include a terrestrial broadcast tuner 2 , a satellite broadcast tuner 3 , a terrestrial broadcast demodulator 4 and a satellite broadcast demodulator 5 .

[0033] The composite satellite and terrestrial wave tuner 1 further includes a terminal 6 to which a terrestrial broadcast signal is input, a terminal 7 to which a satellite broadcast signal is input, a terminal 8 to which a transport stream signal of a terrestrial broadcast is output, and a terminal to which a transport stream signal of a satellite broadcast is output. 9, and I2C terminal 10. The I2C terminal 10 is connected to a microcontroller provided in a broadcast receiver in which the composite satellite and terrestrial tuner 1 is installed. The compo...

Embodiment 2

[0061] image 3 It is a block diagram showing the configuration of a composite satellite and terrestrial wave tuner 1B according to Embodiment 2 of the present invention. image 3 express figure 1 A specific example of the configuration of the overall gain control unit 30.

[0062] refer to image 3 The overall gain control unit 30B includes a DC power supply 31B and a switch circuit 19B connected between the AGC signal line 11 and the output node of the DC power supply 31B. The power supply voltage is applied to or cut off from the AGC signal line 11 by the switch circuit 19B. Here, the switch circuit 19B is switched to an on state or an off state according to a control signal supplied from the tuner control unit 93 of the satellite broadcast tuner unit 3 . Information on the operation mode of the satellite broadcast demodulation unit 5 and the like are supplied from the microcontroller 20 to the tuner control unit 93 through the I2C terminal 10 . Thus, in the second emb...

Embodiment 3

[0066] Figure 4 It is a block diagram showing the configuration of a satellite / terrestrial composite tuner 1C according to Embodiment 3 of the present invention. Figure 4 express figure 1 A specific example of the configuration of the overall gain control unit 30.

[0067] refer to Figure 4 The overall gain control unit 30C includes a dedicated power supply terminal 16 for supplying a power supply voltage 31C to the high-frequency amplifier 15 of the satellite broadcast tuner unit 3 . The power supply terminal 16 is connected to a switch circuit 19C for supplying or cutting off a power supply voltage 31C. Switching of the switch circuit 19C to an on state or an off state is controlled by the microcontroller 20 that controls the entire broadcast receiver.

[0068] When receiving satellite broadcasting, microcontroller 20 turns on switching circuit 19C to supply power supply voltage 31C to high frequency amplifier 15 . When the satellite broadcast is not received, the mi...

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PUM

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Abstract

A satellite and terrestrial composite tuner (1) includes a terrestrial broadcast tuner unit (2), a terrestrial broadcast demodulation unit (4), a satellite broadcast tuner unit (3), and a satellite broadcast demodulation unit (5). Since the satellite broadcast demodulation unit (5) attains a power-saving mode to take an inactive state when a satellite broadcast is not received, power consumption is reduced. Further, when the satellite broadcast demodulation unit (5) is in an inactive state, a total gain control unit (30) suppresses increase in the total gain of the satellite broadcast tuner unit (3). As a result, radiation towards the terrestrial broadcast tuner unit caused by an I signal and Q signal amplified by AGC amplifiers (82, 86, 87) can be suppressed.

Description

technical field [0001] The present invention relates to a satellite and ground wave composite tuner used in a receiver capable of receiving both ground wave broadcasting and satellite broadcasting. Background technique [0002] In a receiver capable of receiving a plurality of broadcast signals having different frequency bands, it is necessary to prevent one broadcast signal from interfering with the other broadcast signal to degrade the signal quality. [0003] For example, Japanese Patent Application Laid-Open No. 2003-110444 discloses a technique for preventing the ground system from interfering with the satellite system when both the satellite system and the ground system receive signals at the same time. [0004] In this prior art, the control unit of the broadcast receiving device monitors signal levels in a satellite RF (Radio Frequency) unit and a terrestrial RF unit, and an error rate in a digital processing unit for demodulation. Furthermore, the control unit perf...

Claims

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Application Information

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IPC IPC(8): H04B1/00H04B1/16H04N5/44H04N5/46
CPCH03G3/3068
Inventor 横山敦美
Owner SHARP KK
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