Loudspeaker diaphragm state estimation method, and loudspeaker drive circuit using the same

Abstract

The invention discloses a loudspeaker diaphragm state estimation method, and a loudspeaker drive circuit using the same. The loudspeaker diaphragm state estimation method is characterized in that: by taking the input current, the relative speed and the relative displacement, obtained through estimation, of the loudspeaker diaphragm, as the input, by taking the driving voltage of the loudspeaker as the output, and by making the non-linear motor coupling coefficient to be 1 thorough per-unit processing, obtaining a more simplified loudspeaker diaphragm displacement model; based on an adaptive filtering method, adjusting the weight value of the diaphragm displacement model until the error between the estimated value of the driving voltage and the measured value of the driving voltage is lower than the preset threshold; and according to the finally determined weight value, estimating the relative displacement of the diaphragm so as to quickly and accurately estimate the loudspeaker diaphragm displacement and realize accurate control of the loudspeaker.

Description

technical field [0001] The invention relates to the field of acoustics, in particular to a loudspeaker diaphragm state estimation method and a loudspeaker driving circuit using the same. Background technique [0002] The speaker is based on the electromagnetic field generated by the electromagnetic coil to drive the diaphragm to vibrate and produce sound. A loudspeaker's power rating is limited by its maximum diaphragm excursion. If the diaphragm is excursed beyond its maximum safe excursion, it may cause irreversible damage to the speaker. In some special cases, the output power of the speaker can be greater than the rated power, and at the same time, the excursion of the diaphragm is less than the maximum safe offset, so that the sound greater than the rated power can be output under the premise of ensuring the safety of the device, and the utilization rate of the speaker can be improved. Especially in portable devices, the volume of the speaker is high, the rated power ...

AI Technical Summary

Problems solved by technology

[0003] In order to achieve the above goals, it is necessary to accurately estimate the displacement of the speaker diaphragm. The traditional methods of detecting the displacement of the diaphragm include laser displacement measurement, laser velocity measurement or sound pressure detection, etc. However, these methods require the use of sensors, so that the speaker system device Large size, difficult to install, difficult to implement, and high cost, so these methods are usually only used in scientific experiments and are difficult to apply to actual products

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