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    • 8. 发明授权
    • Automatic graphic equalizer
    • 自动图形均衡器
    • US4688258A
    • 1987-08-18
    • US793384
    • 1985-10-31
    • Yoshiro KunugiShinichi SuzukiMasayuki Kato
    • Yoshiro KunugiShinichi SuzukiMasayuki Kato
    • H03G5/16H04R3/04
    • H03G5/165
    • An automatic graphic equalizer for a sound system has circuitry for measuring the effect of the physical environment receiving a sound on the frequency characteristics of the sound, and for adjusting the characteristics of a graphic equalizer to compensate for distortions in the desired flat frequency response caused by the physical environment. The circuitry includes a pink noise generator supplying pink noise to the graphic equalizer during an initialization operation, the graphic equalizer being controlled by a controller to present a flat frequency characteristic. The equalizer output is sent to a speaker which supplies the pink noise as a sound signal to the selected environment. A microphone picks up the sound in the selected environment and converts it to an electrical signal which is supplied through an ALC amplifier to a frequency-variable band-pass filter to detect the signal level in each of the equalizer frequency bands. The level signals are smoothed in a level detector and digitized to be input to the controller which readjusts the graphic equalizer to compensate for distortions in the desired flat frequency response caused by the selected environment.
    • 用于声音系统的自动图形均衡器具有用于测量接收声音的物理环境对声音的频率特性的影响的电路,并且用于调整图形均衡器的特性以补偿由所产生的期望的平坦频率响应引起的失真 物理环境。 电路包括在初始化操作期间向图形均衡器供应粉红噪声的粉红噪声发生器,图形均衡器由控制器控制以呈现平坦的频率特性。 均衡器输出被发送到扬声器,扬声器将粉红噪声作为声音信号提供给所选择的环境。 麦克风拾取所选择的环境中的声音,并将其转换为通过ALC放大器提供的电信号到频率可变带通滤波器,以检测每个均衡器频带中的信号电平。 电平信号在电平检测器中被平滑,并被数字化以输入到控制器,其重新调整图形均衡器以补偿由所选择的环境引起的期望的平坦频率响应中的失真。