Stevens, Davis, Miller & Mosher
Audio amplifying circuit
 An amplifying circuit of the invention comprises: a high frequency amplifying circuit for amplifying high frequency; a low frequency amplifying circuit for amplifying a low frequency; input filters which are provided on the input side of the respective amplifying circuits so as to pass the frequency components thereof; output filters having the same characteristics as those of the input filters; and an adding circuit for adding outputs of the output filters. Therefore, an output dynamic range of the whole amplifying circuit is equal to the sum of the dynamic ranges of the respective amplifying circuits, so that a large output which is not distorted even if a sound volume is raised is derived. By providing a matching filter on the input side of the low frequency amplifying circuit, even if the low frequency side output filter which needs a large coil is omitted, the frequency characteristics of the output of the adding circuit can be made flat and the amplifying circuit of a small size and a less distortion can be realized. 
Matsushita Electric Industrial Co., Ltd.
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additional inventional inventional
Masataka I.
Saito Fusanori