Device for preventing a pop noise in an audio output apparatus and method therefor
    1.
    发明公开
    Device for preventing a pop noise in an audio output apparatus and method therefor 有权
    Vorrichtung zur Verhinderung vonKnackgeräuschen在einer Audioausgabevorrichtung und Verfahrendafür

    公开(公告)号:EP1892828A1

    公开(公告)日:2008-02-27

    申请号:EP07115022.1

    申请日:2007-08-27

    IPC分类号: H03F1/30

    摘要: 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.

    摘要翻译: 具有用于产生传递到扬声器的音频信号的音频编解码器的音频输出装置设置有用于防止由音频编解码器输出的偏置电压引起的音频弹出噪声的装置,该装置包括连接在音频的输出端之间的电容器 编解码器和扬声器,用于将电容器平滑地充电到预定电压电平的电容器充电器,布置在音频编解码器的输出端的接头与电容器之间的开关和电容器充电器,以及用于控制编解码器的控制单元, 其中所述控制单元在激活所述音频编解码器之前接通所述开关并驱动所述电容器充电器,然后如果经过预定充电时间,则关闭所述开关并终止所述电容器充电器的操作。 一种用于防止由音频编解码器输出的偏置电压引起的音频弹出噪声的方法包括在激活音频编解码器之前平滑地对电容器充电以使其具有与音频编解码器的偏置电压相同的电压电平,以及激活音频编解码器。