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The double integral method of powering up or down a speaker

A loudspeaker, power-on technology, used in amplifiers, amplification controls, audio amplifiers, etc., can solve problems such as clicks, bursts of non-portable devices, and achieve the effect of low cut-off frequency

Inactive Publication Date: 2012-07-18
MEDIATEK SINGAPORE PTE LTD SINGAPORE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Non-portable devices (such as stereo systems) may also produce popping or clicking noises when powered on or off

Method used

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  • The double integral method of powering up or down a speaker
  • The double integral method of powering up or down a speaker
  • The double integral method of powering up or down a speaker

Examples

Experimental program
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Embodiment Construction

[0037]A power-on / power-off transient waveform generator is provided to enable speaker drive during power-on or power-off of the speaker amplifier to reduce popping or clicking noise. When an AC-coupled speaker is driven from ground (for example, 0V) to a common-mode level during the power-on cycle, the speaker coil is driven with a current that increases at a roughly constant rate during the first half of the power-on cycle. ), while the speaker coil is driven with a current that decreases at a roughly constant rate during the second half of the power-on cycle. Similarly, when an AC-coupled speaker is driven from a common-mode level to a ground voltage level (for example, 0V) during the power-off cycle, a negative current that increases at a roughly constant rate is used for the first half of the power-off cycle to drive the speaker coil, and during the second half of the power-off cycle, the speaker coil is driven with a negative current that decreases at roughly a constant r...

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PUM

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Abstract

An audio subsystem having a waveform generation circuit that generates a power-up signal for controlling an electric signal used to drive a speaker during a power-up period in which the power-up signal has a positive second derivative during a first sub-period of the power-up period and has a negative second derivative during a second sub-period of the power-up period. The first sub-period spans at least one-fourth of the power-up period, and the second sub-period spans at least one-fourth of the power-up period.

Description

Background technique [0001] The present invention relates to power up or power down of loudspeakers. [0002] In some instances, when a power amplifier is turned on to drive a speaker, the output of the power amplifier may have a power-on transient, which may cause a pop or clicksound from the speaker. Similarly, when the power amplifier is turned off, there may be a power-off moment that can cause the speaker to pop or click. Portable devices (such as mobile phones) often switch between normal operation mode (normal operation mode) and standby mode (standby mode) to save power, and when the portable device switches between standby mode and normal operation mode, the speaker of the portable device There will be a popping or clicking sound. Non-portable devices (such as stereo systems) may also produce popping or clicking noises when the power is turned on or off. Contents of the invention [0003] An embodiment of the present invention provides a device for driving a loud...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03F1/30H03G3/34
CPCH04R3/007H03G3/348H03F1/305H03F2200/03
Inventor 斐德利克·卡内基·汤普森
Owner MEDIATEK SINGAPORE PTE LTD SINGAPORE