公开(公告)号：US06831657B2

公开(公告)日：2004-12-14

申请号：US10225386

申请日：2002-08-21

申请人： Kazumasu Tsutsumi ,  Hajime Asahira ,  Tomoaki Makino ,  Hiroyuki Fujita

发明人： Kazumasu Tsutsumi ,  Hajime Asahira ,  Tomoaki Makino ,  Hiroyuki Fujita

IPC分类号： G09G502

CPC分类号： H04S1/007

摘要： Musical sound signal is input to an electronic volume control unit, which in turn adjusts the gain of the input musical signal and outputs the resultant gain-adjusted signal to an amplifier. CPU supplies the electronic volume control unit with a sound volume setting level corresponding to an output of a rotary encoder. At the same time, the CPU generates, with reference to stored data of a ROM table, a hue control signal for changing a displaying hue of a three-color light-emitting diode in accordance with the sound volume setting level supplied by the CPU. The CPU takes in a current sound volume setting level when an upper-limit setting switch is activated, and it retains the taken-in level as an upper limit value of various sound volume setting levels that are to be used to change the displaying hue of the light-emitting diode between purple and red hues. As the sound volume setting level is changed from zero to the upper limit value, the displaying hue changes in a stepwise manner.

摘要翻译： 音乐信号被输入到电子音量控制单元，电子音量控制单元进而调节输入音乐信号的增益，并将所得的增益调节信号输出到放大器。 CPU向电子音量控制单元提供与旋转编码器的输出相对应的音量设定水平。 同时，CPU根据存储的ROM表的数据，根据由CPU提供的音量设定电平，生成用于改变三色发光二极管的显示色调的色调控制信号。 当上限设置开关被激活时，CPU接收当前音量设置级别，并且将采用级别保持为用于改变显示色调的各种音量设置级别的上限值 紫色和红色之间的发光二极管。 当音量设定值从0变为上限值时，显示色调以逐步的方式变化。

公开(公告)号：US07362180B2

公开(公告)日：2008-04-22

申请号：US11204904

申请日：2005-08-16

申请人： Masao Noro ,  Hajime Asahira

发明人： Masao Noro ,  Hajime Asahira

IPC分类号： H03F1/52 ,  H03F3/217

CPC分类号： H03F3/2173 ,  H03F1/52 ,  H03F2200/03 ,  H03F2200/471

摘要： A protection circuit of a digital amplifier includes a DC voltage detection circuit for detecting a DC voltage occurring in a loudspeaker output terminal; a control circuit for performing protection operation when the DC voltage detection circuit outputs a detection signal; and a midpoint potential detection circuit for detecting midpoint potential shift between a positive power supply voltage and a negative power supply voltage. Output of the midpoint potential detection circuit is connected to input of the DC voltage detection circuit and when the midpoint potential shift is detected, the DC voltage detection circuit outputs a detection signal.

摘要翻译： 数字放大器的保护电路包括用于检测扬声器输出端子中出现的直流电压的直流电压检测电路; 用于在直流电压检测电路输出检测信号时进行保护动作的控制电路; 以及用于检测正电源电压和负电源电压之间的中点电位移动的中点电位检测电路。 中点电位检测电路的输出连接到直流电压检测电路的输入，当检测到中点电位移动时，直流电压检测电路输出检测信号。

公开(公告)号：US20070040611A1

公开(公告)日：2007-02-22

申请号：US11204904

申请日：2005-08-16

申请人： Masao Noro ,  Hajime Asahira

发明人： Masao Noro ,  Hajime Asahira

IPC分类号： H03F3/217 ,  H03F1/52

CPC分类号： H03F3/2173 ,  H03F1/52 ,  H03F2200/03 ,  H03F2200/471

摘要： A protection circuit of a digital amplifier includes a DC voltage detection circuit for detecting a DC voltage occurring in a loudspeaker output terminal; a control circuit for performing protection operation when the DC voltage detection circuit outputs a detection signal; and a midpoint potential detection circuit for detecting midpoint potential shift between a positive power supply voltage and a negative power supply voltage. Output of the midpoint potential detection circuit is connected to input of the DC voltage detection circuit and when the midpoint potential shift is detected, the DC voltage detection circuit outputs a detection signal.

摘要翻译： 数字放大器的保护电路包括用于检测扬声器输出端子中出现的直流电压的直流电压检测电路; 用于在直流电压检测电路输出检测信号时进行保护动作的控制电路; 以及用于检测正电源电压和负电源电压之间的中点电位移动的中点电位检测电路。 中点电位检测电路的输出连接到直流电压检测电路的输入，当检测到中点电位移动时，直流电压检测电路输出检测信号。