To easily use an automatic gain control circuit for the radio parts of various radio communication systems whose occupied bandwidth differ from each other. 占有周波数帯域幅が異なる種々の無線通信システムの無線部に容易に利用することができるようにする。 - 特許庁
To provide an on-board automatic volume control device which can obtain a compensation (increase) level of an appropriate reproductive volume such that a volume feeling or bandwidth feeling is not changed during a fast travel also in a vehicle compartment of a vehicle which is being traveled. 走行中の車両の車室内において、高速走行中でも音量感や帯域感が変化しないような適切な再生音量の補償(増加)レベルが得られる車載用自動音量調整装置を提供する。 - 特許庁