公开(公告)号：US06370254B1

公开(公告)日：2002-04-09

申请号：US08749071

申请日：1996-11-14

申请人： David Norman Gore ,  Michael Joseph Kemp ,  Graham John Puddifoot ,  Edwin Charles Hayton

发明人： David Norman Gore ,  Michael Joseph Kemp ,  Graham John Puddifoot ,  Edwin Charles Hayton

IPC分类号： H04R300

CPC分类号： H04N5/60 ,  G09F27/00 ,  H03G3/32 ,  H04N5/44 ,  H04N21/4396

摘要： An audio-visual reproduction system includes an audio signal source, a video signal source and a plurality of audio-visual reproduction devices connected to the audio source and the video source via respective audio and video channels, each such device thereby reproducing combined audio-visual material. Each device includes an automatic audio volume control circuit, and, positioned near the device, an audio transducer generates an output signal in dependence upon ambient noise in the vicinity of the device. The volume control circuit is arranged to apply a level of gain or attenuation in reproducing the audio signal from the audio source responsively to the audio signal level, so as to reduce the effect of the audio signal component within the ambient noise upon the level of gain or attenuation.

摘要翻译： 音视频再现系统包括音频信号源，视频信号源和经由相应音频和视频通道连接到音频源和视频源的多个视听再现装置，每个这样的装置从而再现组合的视听 材料。 每个设备包括自动音频音量控制电路，并且位于设备附近，音频换能器根据设备附近的环境噪声产生输出信号。 音量控制电路被布置为响应于音频信号电平在音频源中再现音频信号时施加一定程度的增益或衰减，以便降低环境噪声中的音频信号分量对增益水平的影响 或衰减。