A 2.5W tablet speaker delivering 3.2W pseudo high power by psychoacoustic model based adaptive power management system

2014 IEEE Asian Solid-State Circuits Conference (A-SSCC) Pub Date : 2014-11-01 DOI:10.1109/ASSCC.2014.7008900

Shin-Hao Chen, S. Peng, Ke-Horng Chen, Shin-Chi Lai, Sheng Kang, Kevin Cheng, Ying-Hsi Lin, Chen-Chih Huang, Chao-Cheng Lee

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Abstract

For a 2.5W speaker in tablets, the proposed adaptive power management (APM) system can deliver a pseudo high power of 3.2W with a ±4V supply because it suppresses 0.7W power on tones that may damage a 2.5W speaker and escape the notice of human ears. With z-domain digital signal processing (z-DSP) and psychoacoustic model, high efficient power management and high sound quality can be achieved simultaneously. Conventional automatic gain control (AGC) only has the ability of 0.32W power suppression. Moreover, suppressing power by conventional clipping technique increases total-harmonic-distortion (THD). In contrast, the proposed real-time dynamic loading impedance (RT-DLI) monitoring brings forward a way to solve the problem on speaker damage while keeping low THD during high sound pressure level (SPL). THD in the APM system is slightly higher than that of original sound 1.1dB, comparing to the disadvantage of 8.6dB increasing caused by conventional clipping technique.

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基于心理声学模型的自适应电源管理系统，实现2.5W平板扬声器的3.2W伪大功率输出

对于平板电脑中的2.5W扬声器，所提出的自适应电源管理(APM)系统可以在±4V电源下提供3.2W的伪高功率，因为它可以抑制0.7W的音调，这些音调可能会损坏2.5W扬声器并逃避人耳的注意。通过z域数字信号处理(z-DSP)和心理声学模型，可以同时实现高效的电源管理和高音质。传统的自动增益控制(AGC)仅具有0.32W的功率抑制能力。此外，传统的裁剪技术抑制功率增加了总谐波失真(THD)。相比之下，本文提出的实时动态加载阻抗(RT-DLI)监测为在高声压级(SPL)下保持低THD的情况下解决扬声器损坏问题提供了一种方法。APM系统的THD略高于原声1.1dB，而传统削波技术的缺点是增加8.6dB。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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2014 IEEE Asian Solid-State Circuits Conference (A-SSCC)

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