FM radio channel searching method based on relative signal strength and relative carrier frequency offset

A technology of relative signal strength and carrier frequency deviation, which is applied in the direction of broadcast receiving circuit, broadcast circuit device, stereo broadcast receiving, etc., can solve the problem of missing or wrong channel, reduce the loss of channel and wrong channel, and avoid the optimal threshold effect of change

Inactive Publication Date: 2018-11-02
深圳昂瑞微电子技术有限公司
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Problems solved by technology

[0004] However, when the same FM broadcast radio has different extension lengths on the whip antenna or different earplugs as the antenna, the optimal threshold for FM broadcast radio search will change accordingly, and the set threshold is a fixed parameter that cannot be changed. At this time, The set threshold is not the same as the optimal threshold; therefore, the method of using the set threshold as an absolute parameter for channel search may lead to serious problems of missing or wrong channels when the configuration of the receiving antenna changes

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  • FM radio channel searching method based on relative signal strength and relative carrier frequency offset
  • FM radio channel searching method based on relative signal strength and relative carrier frequency offset
  • FM radio channel searching method based on relative signal strength and relative carrier frequency offset

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[0028] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments It is only some embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0029] The present invention provides a method for searching FM radio stations based on relative signal strength and relative carrier frequency deviation, such as figure 1 As shown, the method includes:

[0030] S11. Search for four adjacent frequency points, which are respectively recorded as f_0, f_1, f_2 and f_3;

[0031] S12. Calculate ...

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Abstract

The invention provides an FM radio channel searching method based on relative signal strength and relative carrier frequency offset. The method comprises the steps of searching four adjacent frequencypoints, and respectively recording the four adjacent frequency points as f_0, f_1, f_2 and f_3; separately calculating signal strength values of the four adjacent frequency points, and respectively labeling the signal strength values as RSSI_0, RSSI_1, RSSI_2, and RSSI_3; separately calculating carrier frequency offset values of the four adjacent frequency points, that is, CFO_0, CFO_1, CFO_2 andCFO_3; calculating relative signal strength values and relative carrier frequency offset values of the four adjacent frequency points; and determining a frequency point of an FM radio channel according to the relative signal strength values and the relative carrier frequency offset values. The FM radio channel searching method based on relative signal strength and relative carrier frequency offset can prevent an optimal threshold from changing due to change of configuration of a receiving antenna, and avoids missing a channel and finding a wrong channel.

Description

technical field [0001] The invention relates to the technical field of FM broadcasting, in particular to a method for searching FM broadcasting stations based on relative signal strength and relative carrier frequency deviation. Background technique [0002] The purpose of FM radio channel search is to enable users to quickly find radio stations that exist in the frequency band; the primary problem to be solved in the design of the channel search method is to avoid the phenomenon of missing and wrong channels, and the second is to realize a set of fixed thresholds that can be applied to different types of radio stations. , Antenna configurations of different lengths. [0003] In patents CN103795484B, CN102055489B and CN101465667B, several different FM radio search methods based on signal strength, signal-to-noise ratio or frequency deviation have been disclosed, but a common feature of these methods is that they are determined based on absolute parameter values. After passi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04H20/48H04H40/18H04H40/45
CPCH04H40/18H04B17/309H04B17/318H04H20/48H04H40/45
Inventor 张振东张书迁叶晓斌杨清华钱永学孟浩
Owner 深圳昂瑞微电子技术有限公司
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