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Device for preventing a pop noise in an audio output apparatus and method therefor

An audio signal, audio codec technology, applied in audio amplifiers, parts of amplifying devices, control of amplification, etc., can solve problems such as blasting

Inactive Publication Date: 2008-02-27
SAMSUNG ELECTRONICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, whenever the audio codec 110 is activated, the bias voltage is recharged causing the plosive

Method used

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  • Device for preventing a pop noise in an audio output apparatus and method therefor
  • Device for preventing a pop noise in an audio output apparatus and method therefor
  • Device for preventing a pop noise in an audio output apparatus and method therefor

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Embodiment Construction

[0013] Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. In the drawings, the same or similar components are denoted by the same symbols even though they are shown in different drawings. In the following description, descriptions of well-known functions or constructions are omitted since they would obscure the invention in unnecessary detail.

[0014] The present invention provides an audio output device having an audio codec for generating an audio signal transmitted through a capacitor to a speaker, which device charges the capacitor smoothly to a bias with respect to the audio codec before activating the audio codec. The voltage difference between the capacitor and the bias voltage of the audio codec that occurs when the audio codec is activated is substantially eliminated, thereby avoiding audio plosives.

[0015] Referring to FIG. 2 , the inventive device for avoiding plosives in an audio output dev...

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Abstract

An audio output apparatus having an audio codec for generating audio signals delivered to a speaker is provided with a device for preventing an audio pop noise caused by the bias voltage output from the audio codec, which includes a capacitor connected between an output end of the audio codec and the speaker, a capacitor charger for smoothly charging the capacitor to a predetermined voltage level, a switch arranged between the junction of the output end of the audio codec and the capacitor and the capacitor charger, and a control unit for controlling the codec, wherein the control unit turns on the switch and drives the capacitor charger before activating the audio codec, and then turns off the switch and terminates the operation of the capacitor charger if a predetermined charging time has elapsed. A method for preventing the audio pop noise caused by a bias voltage output from the audio codec includes smoothly charging the capacitor to have the same voltage level as the bias voltage of the audio codec before activating the audio codec, and activating the audio codec.

Description

technical field [0001] The present invention generally relates to an audio output device, and in particular, to an apparatus and method for avoiding plosives caused in an audio output device. Background technique [0002] As shown in FIG. 1 , an audio output device generally includes: a control unit 100 , an audio codec (encoder / decoder) 110 , a capacitor 120 and a speaker 130 . The audio codec 110 is driven by the control unit 100 to decode sound data into corresponding analog sound signals. [0003] When the audio codec 110 is activated, the amplifier disposed at the output terminal of the audio codec 110 is turned on, so that the bias voltage of the amplifier is suddenly increased. The sudden increase in the bias voltage generates an alternating current that is applied to the speaker 130 through the capacitor 120, causing a popping sound. At the same time, this bias voltage is stored in the capacitor 120 so that it is not discharged during the operation of the audio cod...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03K5/1254
CPCH03F2200/417H03F2200/345H03G3/348H03F2200/48H03F1/305H03F2200/03H03F2200/351G11B20/18G11B20/22G11B20/24
Inventor 郑秉相金学洙
Owner SAMSUNG ELECTRONICS CO LTD