A sub-audio matching method and terminal

Abstract

The invention discloses a subaudio frequency matching method which comprises the steps of: sampling a current period to obtain m data, taking the current period as a first period, carrying out matching operation according to the following modes of: obtaining the data sampled in continuous n-1 periods after the first period according to the mode same as the first period; comparing m data of each period in the n-1 periods with the m data in the first period; judging whether a first preset condition is met according to the comparison result; and if all the n-1 periods meet the first preset condition, successfully matching, wherein m is greater than 1 and n is greater than 1. The invention also provides a terminal. According to the matching method and the terminal provided by the embodiment of the invention, sine wave data of any period does not need to be locally stored, and space is saved, thus, cost is saved. In addition, a received waveform autocorrelation difference algorithm is adopted, so that an error led by an amplitude value does not exist.

Description

technical field [0001] The present invention relates to a wireless communication system, in particular to a sub-audio frequency matching method and a terminal. Background technique [0002] The follow-up survey on the global digital intercom technology and market shows that the period from 2008 to 2013 is a period of transition from analog to digital. At this stage, most of the market will turn to low-cost digital intercom, and DPMR (DataPrivateMobileRadio, personal digital intercom) is recognized as the best solution for commercial intercom today. It will replace analog walkie-talkie terminals and be used in various fields to realize functions such as short-distance calls and data transmission. During the change period, it is also very necessary for the digital walkie-talkie to be compatible with the analog function, and in the analog function, the sub-audio matching problem is a very important aspect of the analog function. [0003] In general-purpose analog walkie-talki...

AI Technical Summary

Problems solved by technology

[0006] The disadvantage of the above solution is that if the receiver needs to match sine waves of different frequencies, the sine wave data of multiple frequencies needs to be stored locally, which wastes space and eventually leads to high cost

In addition, the amplitude of the received sine wave is dynamic, but the amplitude of the locally stored sine wave is fixed, which increases the error and reduces the success rate of matching

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