Patent ID: 7650002
Filing Date: 2010-01-19
Classification: H03G,H04H,H04S

Abstract:
1. A level adjustment method executed in applicable to an audio processing apparatus having a plurality of amplifiers corresponding to three or more of channels of audio signals, for inputting the audio signals and amplifying the input audio signals, the level adjustment method comprising: a group type select process of selecting a grouping type among a plurality of grouping types, according to operation by a user; a group arrangement process of arranging the plurality of the channels into one or more groups according to the selected grouping type, such that the groupings of the channels are different as between any given two of the grouping types; a detection process of detecting, for each group, a maximal value of the signal levels of the input audio signals of channels belonging to the group; and an adjustment process of determining, for each group, a common amplification gain according to the detected maximum value and supplying the determined common amplification gain to the amplifiers of the channels belonging to the group such as to attenuate the output levels of the input audio signals if the maximum value exceeds a threshold level specified by the user wherein said three or more channels of audio signals constitute a set of surround signals in an ordinary surround system and are grouped together into one or more groups during said group arrangement process, wherein each of the channels of audio signals belongs to only one of the groups and wherein, when the maximum signal level is below the threshold level, the adjustment process is performed to maintain the common amplification gain, when the maximum signal level exceeds the threshold level, the adjustment process is performed to attenuate the level of the input audio signals.