| 摘要 |
PURPOSE:To automatically adjust the difference of input level by controlling the gain with amplification degree data preliminarily set in accordance with a selected input source when plural inputs are selected and amplified in a variable gain amplifier. CONSTITUTION:The input selected by a source selector is inputted to a variable gain amplifier 3. Meanwhile, a control part 4 calculates the degree of amplification in accordance with data indicating the input source detected by a source detecting part 2 and an external input 7 based on inter-source level information and controls the gain of the amplifier 3. The output is amplified by an amplifier 5, and an automatically adjusted certain output is obtained even in case of the difference of input level.
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