AUTOMATIC GAIN CONTROL DEVICE

专利名称：AUTOMATIC GAIN CONTROL DEVICE发明人：IKEDA, TAKESHI,MIYAGI, HIROSHI申请号：EP04747710申请日：20040712公开号：EP1691489A4公开日：20080702

摘要：A received signal level is detected in each of a wide band, middle band, andnarrow band and each detected signal is converted to a digital signal. A DSP 18

determines the enabled/disabled state of an LNA 3 and an attenuator 4 as well as a gainadjustment amount based on the signal level of each band. For example, the gain

adjustment is not performed when the signal level of the narrow band including a desiredfrequency is not larger than a prescribed value even the signal level of the wide band ormiddle band is larger than a prescribed value. When the signal level of the narrow band islarger than the prescribed value exceeding a gain adjustable limit level in the attenuator4, the gain of the LNA 3 is adjusted, while maintaining the gain adjustable amount in theattenuator 4 around the limit level, to reduce the gain as a whole.

申请人：NIIGATA SEIMITSU CO., LTD.,RICOH CO., LTD.

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