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Device and method for the FM radio to accurately search broadcasting station

A radio, accurate technology, used in electrical components, automatic frequency band scanning, transmission systems, etc., can solve the problem of misjudging noise signals as radio signals, etc., to achieve the effect of reducing requirements, high flexibility, and reducing application costs

Inactive Publication Date: 2007-09-12
TIANJIN BINHAI DINGXIN TECH
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  • Summary
  • Abstract
  • Description
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AI Technical Summary

Problems solved by technology

When there is a noise signal greater than the set threshold, the above method will misjudge the noise signal as a radio signal

Method used

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  • Device and method for the FM radio to accurately search broadcasting station
  • Device and method for the FM radio to accurately search broadcasting station
  • Device and method for the FM radio to accurately search broadcasting station

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Embodiment Construction

[0030] Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in further detail:

[0031] An embodiment of the method for the FM radio of the present invention to accurately search for stations is: first obtain the in-phase component I and the quadrature component of the FM modulation signal through radio frequency amplification, radio frequency down-conversion, analog-to-digital converter and digital quadrature down-conversion of the FM signal Q, the signal in-phase component I and the signal quadrature component Q are respectively passed through the low-pass filter; the signal in-phase component I output by the low-pass filter and the square sum of the signal quadrature component Q are sent to the envelope detection module; the low-pass The signal output by the filter is sent to the FM demodulator; the signal data output by the FM demodulation is sent to the DC amplitude detection module; two thresholds Ka and Kb are resp...

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PUM

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Abstract

The invention is a device for a FM radio to accurately search broadcasting stations, comprising FM demodulator, envelope detecting module, and DC amplitude detecting module, where first and second signals are derived from a FM signal through radio amplification, radio down conversion, A / D converter and digital orthogonal down conversion; after the first and second signals pass through low-pass filter, one enters input end of the FM demodulator and the other one is the square of them both and connected with input end of the envelope detecting module; the output end of the FM demodulator is connected with input end of the DC amplitude detecting module. And the invention can select DC detection threshold value according to the frequency offset of crystal oscillators, so as to reduce the requirements for the frequency offsets of crystal oscillators, having strong flexibility and reducing the application cost of the whole system.

Description

【Technical field】 [0001] The invention relates to the field of application design of FM radios, in particular to a method for how to accurately search radio stations for FM radios. 【Background technique】 [0002] How to accurately select the appropriate station for FM radio is commonly used nowadays: [0003] Before the demodulation of the FM signal, there is a limiting circuit, and the current of the limiting circuit is directly proportional to the logarithm of the input signal strength within a considerable range. Using the received signal strength indicator (RSSI) circuit (this circuit detects the current of the limiter circuit) can obtain the strength of the incoming signal, thus select the station. The application of this method is, for example, that a handheld device in mobile communication uses a received signal strength indicator to indicate the size of a received signal. [0004] Although this method has the advantage of simple implementation of the circuit, it ha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B1/16H04B1/06H03J7/18
Inventor 王险峰黄一鸣朱立振刘彦
Owner TIANJIN BINHAI DINGXIN TECH
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