Patent ID: 8295511

Claim:
An audio system comprising: a plurality of audio sources for outputting audio signals different from each other; a gain adjusting device for adjusting gain of an audio signal output from each of said audio sources, and for outputting the audio signal; a non-volatile memory for storing, as internal gains, predetermined gains to be set in said gain adjusting device in correspondence with said audio sources; a selecting device for selecting one of said audio sources; and a processing device for reading from said non-volatile memory the internal gain corresponding to the audio source selected by said selecting device, and for setting the internal gain in said gain adjusting device, wherein said predetermined gains are stored in said non-volatile memory in such manner as to be available for use after a subsequent power-up of the processing device, wherein each of said predetermined gains is calculated by performing a level detection of the output level of the corresponding audio source only once, and wherein each of the predetermined gains remains unchanged while recurrently set as the internal gain of the gain adjusting device in response to the corresponding audio source being selected after subsequent power-ups of the processing device.