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    • 6. 发明授权
    • Digital amplifier apparatus and method of muting digital amplifier apparatus
    • 数字放大器装置和静噪数字放大器装置的方法
    • US07432760B2
    • 2008-10-07
    • US11643627
    • 2006-12-21
    • Toshihiko MasudaYusuke YamamotoArihiro Moroboshi
    • Toshihiko MasudaYusuke YamamotoArihiro Moroboshi
    • H03F3/38
    • H03F3/2173
    • A digital amplifier apparatus includes a gain-adjusting section operable to adjust a gain of a digital audio signal; a dither-superposing section operable to superpose a predetermined dither on the digital audio signal; a pulse-width-modulated signal generating section operable to generate a pulse-width-modulated signal corresponding to the digital audio signal; an amplifying section operable to cause a switching element to perform a switching operation in accordance with the pulse-width-modulated signal; a pulse-width changing section operable to change a ratio between a “high” state and a “low” state of the pulse-width modulated signal; and a control section operable to perform a muting process by causing the gain-adjusting section to set the gain of the digital audio signal to a zero level, the dither-superposing section to stop superposing the dither, and the pulse-width changing section to change, step by step, the ratio between the “high” state and the “low” state of the pulse-width modulated signal toward the “low” state upon receipt of a predetermined muting signal for muting the digital audio signal, thereby maintaining the “low” state and stopping the switching operation performed in accordance with the pulse-width modulated signal.
    • 数字放大器装置包括可调节数字音频信号增益的增益调整部分; 抖动叠加部分,可操作以在数字音频信号上叠加预定的抖动; 脉冲宽度调制信号产生部分,用于产生对应于数字音频信号的脉冲宽度调制信号; 放大部分,其可操作以使开关元件根据所述脉冲宽度调制信号执行切换操作; 脉冲宽度改变部分,用于改变所述脉冲宽度调制信号的“高”状态和“低”状态之间的比率; 以及控制部,其可操作以通过使所述增益调整部将所述数字音频信号的增益设定为零电平来进行静音处理,所述抖动重叠部将所述抖动重叠,所述脉冲宽度变更部变为 在接收到用于使数字音频信号静音的预定静噪信号时,逐步地改变脉冲宽度调制信号的“高”状态与“低”状态之间的比例朝向“低”状态的比例,由此保持 “低”状态,并且停止根据脉宽调制信号执行的切换操作。