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Digital broadcasting wave receiving device

A technology for digital broadcasting and receiving devices, applied in the field of digital broadcasting receiving devices, can solve problems such as complicated wiring and IF signal interference, and achieve the effects of suppressing interference and easy setting and operation.

Inactive Publication Date: 2009-03-18
ALPS ALPINE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, the signal line accommodating method of the flat cable described in Patent Document 1 needs to connect the lines and the digital signal lines at positions symmetrical with respect to the balanced analog signal lines and digital signal lines, respectively. complex issues
[0006] In the digital broadcast wave receiving device shown in FIG. The problem that digital signals such as digital data interfere with the IF signal transmitted on the balanced 2-wire 4a, 4b

Method used

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  • Digital broadcasting wave receiving device
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Examples

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Embodiment Construction

[0051] Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

[0052] FIG. 1 is a schematic diagram of a vehicle-mounted digital broadcast wave receiving device according to an embodiment. The parts that are the same as those of the vehicle-mounted digital broadcast wave receiving device shown in FIG. 10 are denoted by the same reference numerals. The RF processing circuit 10 as a high-frequency circuit unit is built in the antenna side device 2 provided in each part of the vehicle body 1 shown in FIG. device 3.

[0053] As shown in FIG. 1, the flat cable 30 is composed of six unshielded cables 30a-30f arranged in a flat shape. A power supply voltage cable 30c to which a power supply voltage is applied and a ground cable 30d maintained at a ground potential serving as a reference potential are arranged in the center. A pair of balanced analog signal lines (balanced 2 wires) 30a, 30b that transmit IF signals in a balanc...

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Abstract

The invention relates to a digital broadcast receiving device, which restrains interference of IF signals on balanced two wires from a digital signal line, without eliminating imbalance of wire to wire capacity through connecting digital signals line to line. In a vehicle digital broadcast wave receiving device between a RF processing circuit (10) connecting an antenna side and an OFDM modulation circuit (20) through a flat cable (30), clamped between a power high voltage cable (30c) arranged on a center of the flat cable and a grounding cable (30d), analog signal lines (30a, 30b) are arranged on one side, and digital signal lines (303, 30f) are arranged on the other side, connecting one end part of the power high voltage cable (30c) and one side part of the grounding cable (30d) through a capacitor (31) in high frequency and low impedance.

Description

technical field [0001] The present invention relates to a digital broadcast receiving device which transmits television broadcast reception signals from an antenna side device to a main body side device via a flat cable, and supplies digital signals and power from the main body side device to the antenna side device. Background technique [0002] FIG. 9 is a conceptual diagram of a vehicle-mounted digital broadcast wave receiving device. Antenna-side devices 2 are installed at a plurality of positions on the vehicle body 1 , and body-side devices 3 installed at predetermined positions on the vehicle body 1 are connected via flat wires 4 . The antenna-side device 2 includes an RF processing circuit 10 that receives television broadcast waves and frequency-converts them into IF signals. The main body side device 3 includes an OFDM demodulation circuit 20 that demodulates an OFDM-modulated received signal and reproduces video and audio signals. In this vehicle-mounted digital...

Claims

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Application Information

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IPC IPC(8): H04H20/57H04N5/445H04L27/26H04B1/10
Inventor 青木一晴大山徹
Owner ALPS ALPINE CO LTD