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
CN111343560BActive Publication Date: 2021-06-18SHANGHAI FOURSEMI SEMICON CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
SHANGHAI FOURSEMI SEMICON CO LTD
Publication Date
2021-06-18

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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.
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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...

Claims

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