Structure for detecting vibration displacement of loudspeaker and double-effect device capable of realizing acoustic-electric inter-conversion

A vibration displacement, speaker technology, applied in the direction of sensors, electrical components, etc., can solve problems such as differences, speaker physical parameter deviations, and it is difficult to accurately reflect the real displacement of speaker products in real time.
CN104780489AActive Publication Date: 2015-07-15GOERTEK INC
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
GOERTEK INC
Publication Date
2015-07-15

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Abstract

The invention discloses a structure for detecting the vibration displacement of a loudspeaker. The structure comprises a vibration system provided with a movable pole plate, a magnetic circuit system and a fixed pole plate, wherein the fixed pole plate is arranged below the vibration system and is opposite to the movable pole plate, and the movable pole plate and the fixed pole plate form a capacitor. The invention further discloses a double-effect device capable of realizing acoustic-electric inter-conversion. The double-effect device further comprises an impedance converter connected with the capacitor, wherein the impedance converter comprises a field-effect transistor and a diode. The movable pole plate of the capacitor is arranged on the vibration system, the fixed pole plate is arranged below the vibration system and fixed, and the actual displacement of the vibration system can be calculated through detection of change of the capacitor when the vibration system vibrates, so that the power of the loudspeaker can be reduced when the actual displacement of the vibration system exceeds the safety threshold. For electronic equipment adopting the loudspeaker structure, the displacement of each loudspeaker product can be detected in real time at the system end of the electronic equipment.
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Description

technical field

[0001] The invention relates to a structure for detecting the vibration displacement of a loudspeaker and a double-effect device for mutual conversion of sound and electricity. Background technique

[0002] In the prior art, whether it is a micro speaker or a large speaker, when working under low frequency conditions, the problems that limit the maximum power application of the product mainly lie in:

[0003] Under high power, the voice coil working under low frequency conditions produces excessive displacement, and excessive displacement will lead to a sharp increase in distortion, and even obvious rubbing problems between the voice coil and the magnetic circuit system, which will cause the product system of mechanical damage.

[0004] For this problem, the current solution is to use the intelligent power amplifier control unit to control the power of the speaker product, and "deduce" the vibration system of the speaker according to the input information (s...

Claims

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