Patent ID: 9736595
Date: 2017-08-15
CPC Classifications: H04R

Claim:
1. A speaker, comprising: a group of chambers; a first port; a group of membranes that are configured to oscillate within the group of chambers thereby generating a group of ultrasonic signals that comprises one or more ultrasonic signals; a group of acoustic modulators are configured to oscillate thereby modulating the group of ultrasonic signals to provide a group of audible signals that comprises a first audible signal and a second audible signal that are out-of-phase; wherein only one of the first and second audible signals is outputted from the speaker via the first output port and at a first direction; and a control unit that is configured to control at least one of (a) the group of membranes and (b) the group of acoustic modulators in response to an input signal that represents an input audio signal.