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Method for attenuating interference generated by intermodulation products

一种互调产物、用无线电的技术，应用在传输系统、电气元件等方向，能够解决方式不兼容等问题，达到有利于脱敏性能的效果

Active Publication Date: 2019-11-12
CONTINENTAL AUTOMOTIVE FRANCE +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0015] This prior art has a major disadvantage when an overly strong signal, due to intermodulation products, produces a phantom frequency substantially equal to the frequency of the desired but low power radio signal
However, this technique requires a second tuner in the radio receiver, and its implementation usually takes tens of seconds, which is incompatible with the way users actually use radio receivers, especially those mounted in vehicles

Method used

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  • Method for attenuating interference generated by intermodulation products
  • Method for attenuating interference generated by intermodulation products
  • Method for attenuating interference generated by intermodulation products

Examples

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Embodiment Construction

[0047] The method according to the invention for attenuating interference caused by intermodulation products in FM radio signals, which is primarily intended to be implemented in a radio receiver of an on-board multimedia system in a motor vehicle, is described below.

[0048] However, implementation of the invention in any other technical field, in particular in any type of FM radio receiver, is also intended.

[0049] The invention aims to be realized in the context of receiving FM radio signals.

[0050] refer to figure 1 , when an FM radio signal is received by the antenna A of the radio receiver 1, said FM radio signal is filtered via the outer passband filter F and then attenuated where appropriate by the automatic gain control device CAG, which Especially to avoid any overloading in the presence of strong signals.

[0051] This signal is then processed by suitable means X, for example to enable its pre-amplification or to convert it into digital format. through the FM ...

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Abstract

A method for attenuating interference generated by intermodulation products with respect to a multiplexed radio signal having a desired frequency, said method comprising the following steps: implementing automatic gain control (AGC) having a gain setpoint able to be configured between a first setpoint and a second setpoint lower than said first setpoint; configuring (AGC+) the automatic gain control such that the gain setpoint is equal to the first setpoint; detecting the presence of co-channel interference at the desired frequency; if co-channel interference is detected at the desired frequency, then, if the automatic gain control is active, configuring it such that the gain setpoint is equal to the second setpoint and, if the automatic gain control is not active, configuring it such thatthe gain setpoint is equal to the first setpoint.

Description

technical field [0001] The invention relates to the field of reception of frequency modulated radio signals, in particular in mobile radio receivers exposed to interference problems caused by intermodulation products. Background technique [0002] It often occurs that the intermodulation products of a high-power radio signal interfere with a desired low-power radio signal. [0003] The present invention is aimed at a method enabling the attenuation of the interference produced by intermodulation products. [0004] It is well known that radio receivers, especially in multimedia systems of motor vehicles, are capable of receiving radio signals, in particular FM radio signals, FM being an acronym for "Frequency Modulation", meaning "Frequency Modulation". [0005] Such FM radio signals received by the radio receiver in modulated form are passed through various sensors and matched filters so that the corresponding demodulated radio signals can be played back in good condition, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B1/10
CPCH04B1/1027H04B1/1036H04B2001/1045
Inventor L.泰里林超
Owner CONTINENTAL AUTOMOTIVE FRANCE
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