Speaker

Abstract

The present invention discloses a loudhailer, which can detect exactly electrostatic capacitor between center electrode and Voice coil of wire and not affected by interference noise. The invention detects electrostatic capacitor between center electrode (5)and voice coil of wire (4),the characteristic of electrostatic capacitor is: the transformation circuit (11) outputted when imbarking at the any side of box (9), frame (10), center electrode (5)will transform the electrostatic capacitor detected to stated electric signal. In this way, the leading wire (11f) between detector and transformation circuit (11) can be shorten, the interference noise affecting leading wire (11f) can be restrained to minimum.

Description

technical field [0001] The present invention relates to a loudspeaker; specifically, to a loudspeaker for detecting the operating state of a vibrating piece. Background technique [0002] A speaker equipped with an MFB (Motional Feed Back: Motion Feedback) circuit is known as a technique for improving the quality of a speaker. This MFB circuit detects the vibration state of the vibrating vibrating piece based on the electrical signal (hereinafter referred to as "sound signal") representing the sound information input to the speaker, and performs feedback control on the vibrating piece according to the detection result, thereby eliminating Especially in the bass area prone to sound distortion. Therefore, it is generally considered that the MFB circuit is effective for small speakers that are difficult to reproduce the bass range. [0003] Patent Documents 1 to 5 have been disclosed as technologies related to MFB circuits. Patent Documents 1 to 5 all detect the operating st...

AI Technical Summary

Problems solved by technology

[0009] However, in the existing loudspeaker, the conversion circuit is installed in the amplifier located away from the detector, so the lead wires connecting the electrodes and the conversion circuit must be long, and the current flowing through the lead wires is caused by various electromagnetic phenomena inside and outside the speaker. Static electricity and electromagnetic waves output by electronic equipment installed around the speaker (hereafter referred to as "disturbance noise")

Therefore, there is a problem that the conversion circuit cannot convert the real electrostatic capacitance formed between the electrodes into a detection signal.

Therefore, the existing technology cannot accurately detect the action state of the vibrating piece, especially cannot fully eliminate the sound distortion in the low range of the small speaker

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