公开(公告)号：US5469510A

公开(公告)日：1995-11-21

申请号：US82633

申请日：1993-06-28

申请人： Henry F. Blind ,  Anthony J. Campagne ,  James L. Czekaj ,  Nicholas L. Difiore ,  Earl R. Geddes ,  Andrew C. Krochmal ,  Myron I. Senyk

发明人： Henry F. Blind ,  Anthony J. Campagne ,  James L. Czekaj ,  Nicholas L. Difiore ,  Earl R. Geddes ,  Andrew C. Krochmal ,  Myron I. Senyk

IPC分类号： B60R11/02 ,  G10K11/178 ,  H03G3/20 ,  H03G3/32 ,  H03G5/16 ,  H03G9/02 ,  H03G11/00 ,  H03H17/00 ,  H03H21/00 ,  H04B3/04

CPC分类号： H03G9/005 ,  H03G11/00 ,  H03G9/025

摘要： An acoustic production system having multiple signal sources and a power amplifier driving an acoustic transducer such as a loudspeaker includes an arbitrator in a power limiter circuit to selectively limit the input level of one of the sources to the power amp in response to an overdrive signal from the amplifier. The input level to the power amplifier is automatically reduced in response to the overdrive signal until a predetermined level of limiting has been attained. Once the predetermined level of limiting is reached, the arbitrator outputs a second overdrive signal to prompt additional limiting of the power amplifier output. Preferably, the arbitrator is included in an interior active noise cancellation module combined with an audio entertainment system for a passenger compartment of a motor vehicle. The audio system also preferably separates the audio reproduction into high frequency and low frequency branches, whereby the arbitrator acts upon the signals output in the frequency ranges of active noise cancellation and the bass output of the audio entertainment system that are most likely to overdrive an amplifier.

摘要翻译： 具有多个信号源的声学生产系统和驱动诸如扬声器之类的声学换能器的功率放大器包括：功率限制器电路中的仲裁器，用于响应于来自第二个信号的过驱动信号选择性地将功率放大器的一个源的输入电平限制到功率放大器 放大器。 功率放大器的输入电平响应于过驱动信号而自动减小，直到达到预定的限制水平。 一旦达到预定的限制电平，则仲裁器输出第二过驱动信号以提示功率放大器输出的附加限制。 优选地，仲裁者被包括在与用于机动车辆的乘客舱的音频娱乐系统相结合的内部主动噪声消除模块中。 音频系统还优选地将音频再现分离成高频和低频分支，由此仲裁器对在最有可能过度驱动放大器的有源噪声消除和音频娱乐系统的低音输出的频率范围中输出的信号起作用 。