| 摘要 |
An audio reproduction system for use in an audio amplifier, for example, has a tone control unit for increasing or reducing a gain, or keeping an increased or reduced gain, of a signal if a particular frequency range of an audio signal supplied thereto, and a volume control unit for increasing or reducing the gain of the audio signal in a full effective frequency range. The tone and volume control units are ganged by a gain control unit, so that the gain which has been increased in the particular frequency by the tone control unit, can be controlled depending on the degree to which the gain has been increased by the volume control unit. The tone and volume control units may include variable resistors, respectively, whose movable contacts are interconnected. When the knob of the volume control unit is shifted toward a higher scale level position, the gain of the signal in the particular frequency range is lowered by the tone control unit, thereby preventing the reproduced sound from being distorted. When the knob of the volume control unit is shifted toward a lower scale level position, the gain of the signal in the particular frequency range is increased by the tone control unit.
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