A mobile phone horn resonant frequency fo test and tracking method

A resonant frequency and speaker technology, which is applied in the field of mobile phone speaker fo testing and tracking, can solve the problems of high calculation speed and long time, and achieve the effects of simplifying hardware, taking into account area, saving area and power consumption

Active Publication Date: 2021-06-18
SHANGHAI FOURSEMI SEMICON CO LTD
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Problems solved by technology

Obviously, all frequency points are calculated once, or the time is very long, or the calculation speed must be very high

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  • A mobile phone horn resonant frequency fo test and tracking method
  • A mobile phone horn resonant frequency fo test and tracking method
  • A mobile phone horn resonant frequency fo test and tracking method

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[0066] In order to make the purpose, technical solution and advantages of the present application clearer, the technical solution of the present application will be clearly and completely described below in conjunction with specific embodiments of the present application and corresponding drawings. Apparently, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the scope of protection of this application.

[0067] Depend on Figure 4 It can be seen that when the frequency is lower than fn, the Zi corresponding to fo is the maximum value and also the extreme value. Therefore, in an ideal situation, only 3 adjacent frequency points are required to be determined. However, in fact, the impedance amplitude-frequency characteristic curve of the speaker is no...

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Abstract

The application discloses a mobile phone speaker fo test and tracking method, using the BPF method to obtain the amplitude-frequency characteristic curve, using the slope method to judge the extreme value, and is divided into several working modes: monitoring mode, fast search mode and precise search mode. The advantages are as follows: 1) The algorithm simplifies the hardware as much as possible, and saves area and power consumption. 2) By setting different application scenarios, the area, power consumption, precision and speed are considered.

Description

technical field [0001] The present application relates to the technical field of speakers, in particular to a fo test and tracking method for a mobile phone speaker. Background technique [0002] The simplified electrical model of the mobile phone speaker is as follows: figure 1 As shown, the expression of its impedance is: [0003] Z(s)=R DC +sLe+Zp(s) ---(1) [0004] in [0005] [0006] s=jω=j2πf ---(3) [0007] The frequency-amplitude curve of a typical mobile phone speaker impedance is as follows figure 2 shown. [0008] In the frequency range f1 to f2, the impedance of the speaker is mainly determined by Zp. The expressions for the modulus and frequency of Zp are: [0009] [0010] |Zp(ω)| is normalized to |Zp(ωo)| [0011] [0012] in [0013] [0014] [0015] Z DC is the DC resistance Rdc of the horn coil. It increases linearly with the temperature of the speaker, so it is mostly used to monitor the temperature of the speaker. [0016] f...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04R29/00H04M1/24
CPCH04M1/24H04R29/001
Inventor 刘伟吉何秀安刘保良
Owner SHANGHAI FOURSEMI SEMICON CO LTD
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