Loudspeaker intelligent power control system and control method thereof

Abstract

The invention discloses a loudspeaker intelligent power control system and a control method thereof. The loudspeaker intelligent power control system comprises a hardware circuit unit and a platform operator electrically connected with the hardware circuit unit. And the platform operator block judges that the waveform of the input signal to be output to the hardware circuit unit is controlled to be within the signal waveform amplitude corresponding to the rated power in an amplitude limiting manner if the continuous time delay of the peak power of the equivalent power value is greater than orequal to the time delay threshold. The hardware circuit unit comprises a feedforward processing part, a waveform adder, a power amplifier and a loudspeaker which are connected in sequence, and the feedforward processing part judges whether a signal gain value needs to be adjusted and outputs the adjusted signal gain value to the waveform adder. Moreover, the loudspeaker intelligent power control method can intelligently carry out idealized control on the output quality of the audio signal so as to avoid a signal clipping phenomenon and signal distortion.

Description

technical field [0001] The invention relates to the technical field of loudspeakers, in particular to a loudspeaker intelligent power control system and a control method thereof. Background technique [0002] Mobile phone speakers and other miniature speakers often exhibit a large amount of distortion which limits the maximum volume at which the speaker can reproduce audio in a comfortable manner for the user. For example, the output of any loudspeaker suffers from distortion when the total harmonic distortion (THD) reaches frequencies in the range of peak power (ie, exhibits a local maximum) overdriving the loudspeaker. [0003] The smart power amplifier chip is the hardware circuit of the speaker, and the power control calculation of the speaker is realized by adjusting the output gain in real time according to the output signal amplitude of the hardware circuit. Today's smart power amplifier chips will check whether the signal has clipping while amplifying the input sign...

AI Technical Summary

Problems solved by technology

[0004] Among them, automatic gain control (agc) is the most important part of dynamic gain control. The general analog implementation method is to detect the output signal amplitude and compare it with the threshold level. If it exceeds the threshold level, it will perform amplitude limiting processing. Repeated clipping will make the sound quality worse, which requires the response time of the automatic gain control to be fast enough. However, it does not need to respond too fast near the rated power, otherwise it will affect the sound quality and hearing experience, so the frequency of the automatic gain control It is not easy to handle, and signal clipping and different degrees of signal distortion will inevitably occur

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