Radio signal automatic searching device and method and frequency modulation radio

Abstract

The invention discloses a radio signal automatic searching device and method and a frequency modulation radio, which belongs to the technical field of automatic station searching. The device comprises a searching unit, a first judging unit which is connected with the searching unit, a frequency point extraction unit which is connected with the first judging unit, a second judging unit which is connected with the frequency point extraction unit, and a recording unit which is connected with the third judging unit. The method comprises the steps that automatic station searching is carried out at frequency interval; frequency points with real stations are judged and added into an effective frequency point list; frequency offset judgment is carried on frequency points in the effective frequency point list, including a frequency point to be detected, a previous frequency point and a next frequency point; judgment of a predetermined number is repeatedly carried out on the frequency points to be detected; the frequency points which are to be detected and do not accord with a judgment condition are deleted; and finally the frequency of the frequency point to be detected in the list is recorded. According to the technical scheme, false stations, stacked stations and mirror image stations are effectively removed; the accuracy of automatic station searching is improved; and the device, the method and the frequency modulation radio have the advantages of simple structure, convenient realization and low cost.

Description

technical field [0001] The invention relates to the technical field of automatic station search, in particular to a device and method for automatic station search and an FM radio. Background technique [0002] Automatic channel search is one of the indispensable functions of FM radio (Frequency Modulation Radio, FM Radio). Usually, before using an FM radio that has not yet recorded a station, you first need to turn on the automatic station search function to record the frequency of the real station, so that you can directly select the station when you use it next time. [0003] In the prior art, the channel search step of the FM radio is usually 100kHz, and for each frequency point, it is necessary to determine whether the radio signal received at the frequency point is a real station. In the prior art, there are three criteria for judging whether it is a real radio station, namely: pilot signal energy, frequency offset, and antenna terminal signal power. However, judging ...

AI Technical Summary

Problems solved by technology

However, judging the radio signals received on the corresponding frequency points according to the criteria in the prior art, it is easy to mistake some fake, overlapping or mirrored stations as real stations, thus affecting the accuracy of automatic station search

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