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System for increasing perceived loudness of speakers

A loudspeaker and loudness technology, applied in two-channel systems, stereo systems, loudspeakers, etc., can solve the problems of battery power consumption, distortion, and inability to reproduce the audible frequency range

Active Publication Date: 2012-05-23
DTS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Small speaker drivers suffer from low output levels and often cannot reproduce the entire audible frequency range
When increasing amplitude, distortion is introduced and more battery power is consumed

Method used

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  • System for increasing perceived loudness of speakers
  • System for increasing perceived loudness of speakers
  • System for increasing perceived loudness of speakers

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Embodiment Construction

[0031] I. Introduction

[0032] Mobile phones and other similarly sized devices tend to have smaller speakers that are limited in the volume of sound they produce. It can therefore be difficult to hear mobile phone conversations, music and other audio in the presence of background noise.

[0033]This publication describes a system and method for increasing the perceived loudness of a speaker. These systems and methods can be used to cause speakers to sound louder than is achievable by simply increasing the volume. In a particular embodiment, the headroom of the audio signal is increased in preparation for conditioning the audio signal for loudness. Headroom can be increased by filtering out frequencies that the loudspeaker cannot reproduce, so that an additional level of amplification can be achieved for the signal. The audio signal can then be analyzed according to one or more intuitive loudness curves to determine how loud the audio signal can be perceived. In situatio...

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Abstract

A system can be provided for increasing loudness of an audio signal to present a perceived loudness to a listener that is greater than a loudness provided natively by a loudspeaker. The system can include one or more of the following: a frequency suppressor, a loudness adjuster, an equalizer, and a distortion control module. The frequency suppressor can increase headroom in the audio signal by filtering out low and / or high frequencies. The loudness adjuster can calculate a loudness of the audio signal and apply a gain to the audio signal to increase the loudness. The equalizer can further increase headroom by attenuating portions of a passband of the loudspeaker's frequency response. The distortion control module can induce partial harmonic distortion in the audio signal to further increase loudness.

Description

Background technique [0001] The physical size constraints of portable media devices often make the speakers in these devices relatively small in size. Small speaker drivers suffer from low output levels and often cannot reproduce the entire audible frequency range. When increasing the amplitude, distortion is introduced and more battery power is consumed. The noisy environment in which these devices are typically used only contributes to these problems. [0002] Existing solutions to combat the low levels emanating from these devices tend to include adding hardware such as external speakers. These solutions run counter to the notion of portability either by adding bulk to devices that have been carefully designed to be small or by carrying a large number of gadgets around the consumer. Contents of the invention [0003] In a particular embodiment, a system for increasing the loudness of an audio signal is presented to present a perceived loudness to a listener that is gre...

Claims

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Application Information

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IPC IPC(8): H03G3/00
CPCH04R3/04H03G9/005H03G9/025H03G5/165H04S1/002H04R2400/00H04R2430/01
Inventor 萨拉·杨理查德·J·奥利弗罗伯特·C·III·马林
Owner DTS
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