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1. 发明授权

US5081682A On-vehicle automatic loudness control apparatus 失效
标题翻译：车载自动舒适控制装置
公开(公告)号：US5081682A
公开(公告)日：1992-01-14
申请号：US530535
申请日：1990-05-30
申请人： Shinjiro Kato , Fumio Tamura , Masayaki Kato
发明人： Shinjiro Kato , Fumio Tamura , Masayaki Kato
IPC分类号： H03G3/32
CPC分类号： H03G3/32
摘要： An on-vehicle automatic loudness control apparatus according to the present invention comprises a volume control circuit for receiving an audio signal from an audio signal source, the volume control circuit controlling an output level therefrom in accordance with a first signal supplied thereto; a level detecting unit for receiving the output level from volume control circuit, the level detector controlling an output level therefrom in accordance with a second signal supplied thereto, a noise detecting unit for detecting environmental noise in a passenger space of a car to output a noise signal in accordance with the environmental noise level; a relative level detecting circuit for comparing the output level from the level detector with the noise signal to output a third signal indicative of a relative magnitude between the output level from the level detector and the noise signal; and a control circuit for outputting the first signal and the second signal in accordance with the third signal. The second signal causes the output level from level detector to decrease when the output level of the volume control circuit is increased, and the second signal causes the output from level detector to increase when the output level from volume control circuit is decreased.
摘要翻译：根据本发明的车载自动响度控制装置包括：音量控制电路，用于从音频信号源接收音频信号;音量控制电路根据提供给它的第一信号控制输出电平; 电平检测单元，用于从音量控制电路接收输出电平，电平检测器根据提供的第二信号控制输出电平;噪声检测单元，用于检测轿厢的乘客空间中的环境噪声，以输出噪声信号按照环境噪声水平; 相对电平检测电路，用于将来自电平检测器的输出电平与噪声信号进行比较，以输出指示来自电平检测器的输出电平与噪声信号之间的相对幅度的第三信号; 以及控制电路，用于根据第三信号输出第一信号和第二信号。当音量控制电路的输出电平增加时，第二信号使得电平检测器的输出电平降低，而当音量控制电路的输出电平降低时，第二信号使电平检测器的输出增加。

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