Patent ID: 11950065
Assignee: nan
Field: Audio-visual technology (Electrical engineering)
Classification: CPC H | IPC H

Claim 0:
1. A speaker system comprising:
a main speaker to be driven by an original sound signal output from a sound source,
a vibration detection unit that detects vibrations in a vibration system of said main speaker and outputs a play back signal corresponding to said vibration,
a subtractor that outputs an error signal indicating a difference between the original sound signal and the play back signal,
a sub-speaker that based on said error signal, outputs a sound of the same phase as that of the main speaker to increase the sound pressure level when the sound pressure level of the main speaker is insufficient, and while when the sound pressure level of the main speaker is excessive, the sub-speaker outputs a sound in the opposite phase of the sound of the main speaker to decrease the sound pressure level.