Patent ID: 8068621

Claim:
An apparatus for controlling a graphic equalizer which is implemented by digital filters, each digital filter being assignable to a frequency band for regulating a level of the frequency band by means of a set of corresponding control devices, each control device being operable to specify the level of the corresponding frequency band to either a reference level or a level other than the reference level, the apparatus comprising: an assignment device operative when a number of the digital filters is less than a total number of the frequency bands, for assigning the digital filters to the frequency bands which are specified with levels other than the reference level by the corresponding control devices; a control device that controls each the assigned digital filters to regulate the corresponding frequency band to the level specified by the corresponding control device, and that controls digital filters which are not assigned to any of the frequency bands in a through state; and a disabling device operative when the assignment device assigns all of the digital filters to the frequency bands which are specified with levels other than the reference level, for disabling operation of a control specifying the reference level.