公开(公告)号：US06266425B1

公开(公告)日：2001-07-24

申请号：US09433048

申请日：1999-11-03

申请人： Masanori Fujisawa ,  Takemi Irokawa

发明人： Masanori Fujisawa ,  Takemi Irokawa

IPC分类号： H03F2100

CPC分类号： H03F3/2175

摘要： An audio signal amplifier circuit and an audio device are characterized by comprising: an arithmetic circuit which receives digital audio signals and generates in response to digital control signals for sound volume adjustment, calculated digital values corresponding to the sound volume adjustment; a D/A converter circuit which D/A converts the calculated digital values from the arithmetic circuit and generates analogue values; a pulse generating circuit which generates pulses having a predetermined frequency of which generation period is PWM-modulated in response to output analogue values of the D/A converter circuit; and a driving current generating circuit which receives the pulses of the pulse generating circuit and generates current values corresponding to the PWM modulation, and wherein a speaker is driven in response to outputs from the current value generating circuit.

摘要翻译： 音频信号放大器电路和音频装置的特征在于包括：运算电路，其接收数字音频信号，并响应于用于音量调节的数字控制信号产生与音量调整相对应的计算的数字值; D / A转换器电路，其D / A转换来自运算电路的计算出的数字值并产生模拟值; 脉冲发生电路，响应于D / A转换器电路的输出模拟值产生具有预定频率的脉冲，所述预定频率的发生周期被PWM调制; 以及驱动电流产生电路，其接收脉冲发生电路的脉冲并产生对应于PWM调制的电流值，并且其中响应于来自电流值产生电路的输出驱动扬声器。