| 摘要 |
A disc playback device capable of automatically adjusting the tone volume of a signal reproduced from a disc comprises a disc identifying circuit for identifying a disc loaded in the device, a tone volume setter for setting the tone volume of a signal reproduced from the disc, a memory for storing tone volume data for each disc set by the tone volume setter together with disc identifying data provided by the disc identifying circuit, and an automatic tone volume adjusting circuit for reading out set tone volume data corresponding to data of the identified disc from the memory when the disc has been loaded in the device and automatically adjusting the tone volume setter to the set tone volume. Data representing an optimum volume for each disc determined by the listener and disc identifying data are stored in the memory. A disc is identified when it has been loaded in the device and the data representing the optimum tone volume corresponding to the identified disc is read out and the tone volume of the reproduced tone signal is controlled in accordance with this optimum tone volume data whereby the tone volume of each disc is automatically adjusted.
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