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

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

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

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.

Original languageEnglish
Title of host publication2014 IEEE Asian Solid-State Circuits Conference, A-SSCC - Proceedings of Technical Papers
PublisherInstitute of Electrical and Electronics Engineers Inc.
Pages221-224
Number of pages4
ISBN (Electronic)9781479940905
DOIs
StatePublished - 13 Jan 2015
Event2014 10th IEEE Asian Solid-State Circuits Conference, A-SSCC 2014 - Kaohsiung, Taiwan
Duration: 10 Nov 201412 Nov 2014

Publication series

Name2014 IEEE Asian Solid-State Circuits Conference, A-SSCC - Proceedings of Technical Papers

Conference

Conference2014 10th IEEE Asian Solid-State Circuits Conference, A-SSCC 2014
CountryTaiwan
CityKaohsiung
Period10/11/1412/11/14

Keywords

  • class D audio amplifier
  • digital signal processing
  • power suppression
  • psychoacoustic model
  • speaker protection

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