US Patent 10959009 Wearable personal acoustic device having outloud and private operational modes

A method of operating an audio system that includes a non-wearable acoustic system and a wearable acoustic device, each having at least one acoustic driver, includes generating, at the at least one acoustic driver of the non-wearable acoustic system, a first acoustic signal having a range of acoustic frequencies. In response to a request of a change of operational mode of the non-wearable acoustic system, a second acoustic signal having a first sub-range of the acoustic frequencies is generated at the at least one acoustic driver of the non-wearable acoustic system and a third acoustic signal having a second sub-range of the acoustic frequencies is generated at the at least one acoustic driver of the wearable acoustic device. The first sub-range of acoustic frequencies is different from the second sub-range of acoustic frequencies and the range of acoustic frequencies is inclusive of the first and second sub-ranges of acoustic frequencies.