Patent ID: 7596233
Filing Date: 2009-09-29
Classification: H03G

Abstract:
1. A system for controlling volume, the system comprising: a rotational operation apparatus configured for performing rotational operations by users and generating rotation signals corresponding to the rotational operations, each rotation signal comprising a rotational direction signal and a corresponding rotation pulse; a controlling apparatus configured for generating volume controlling signals for adjusting volume; and an audio amplifier configured for adjusting volume according to a signal amplitude corresponding to the volume controlling signal; wherein the controlling apparatus is further configured for determining a rotational direction, a number of rotation pulses and a cycle of each rotation pulse; and resetting the audio amplifier as mute, if the cycle of rotation pulse is less than a preset time and the number of rotation pluses is greater than or equal to a preset number, the rotational direction is counterclockwise, and the audio amplifier is not in a mute state.