Loudspeaker output power control method and system

Abstract

The embodiment of the invention provides a loudspeaker output power control method and system. The method comprises the following steps: synthesizing an original audio signal and a small-amplitude excitation signal to obtain an audio synthesis signal, and copying the audio synthesis signal to obtain a first audio signal and a second audio signal; carrying out delay processing on the first audio signal to obtain a first audio signal after delay processing; performing root-mean-square processing on the second audio signal to obtain a root-mean-square of the second audio signal, and obtaining a target audio input signal gain coefficient according to the root-mean-square of the second audio signal and a loudspeaker output power threshold; and performing gain processing on the first audio signal after delay processing according to the target audio input signal gain coefficient so as to control the output power of the loudspeaker. The embodiment of the invention ensures that the loudspeaker is effectively protected. Meanwhile, the output power and the loudness of the loudspeaker can be improved to the maximum extent.

Description

technical field [0001] The invention relates to the technical field of signal processing, in particular to a loudspeaker output power control method and system. Background technique [0002] As a new generation of power amplifiers, the Smart Power Amplifier (SPA) utilizes real-time voice coil feedback signals to control the output power of the speakers, allowing the miniature speakers to last longer without thermal and mechanical damage. The time is output at a higher power to meet consumers' needs for high volume and loudness in mobile audio application scenarios such as mobile phone speakers. [0003] The rated noise power value (ratedpower) and limit temperature threshold (Tmax) of the speaker are generally given in the specification book provided by the speaker manufacturer, and two different types of speaker output power control methods are formed according to these two indicators, so , the existing loudspeaker output power control methods can be mainly divided into th...

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Problems solved by technology

[0004] However, the power-based control method, since the rated power of the speaker is provided by each manufacturer, usually only guarantees that the speaker can continue to work at the rated power when playing pink noise (most music signal spectrum energy distribution is similar to pink noise), and does not guarantee In the case of any input signal, the loudspeaker will continue to work at the rated power; based on the temperature control method, the limit temperature threshold (Tmax) is a relatively conservative estimate given by the manufacturer according to the temperature resistance value of the voice coil material, and The maximum allowable temperature of the voice coil is not obtained through strict tests, so controlling the temperature of the speaker coil below the limit temperature threshold will definitely cause over-protection and loss of part of the speaker performance

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