Patent ID: 9457379
Filing Date: 2016-10-04
CPC Classification: B06B,G01B,G01S,H04R

Claim Text:
1. A transmitter comprising: a drum; a membrane coupled to the drum; a first electrode coupled to the drum; a second electrode coupled to the membrane; and a plurality of posts disposed within the drum, wherein the plurality of posts have non-uniform heights such that: while the membrane is in a first configuration, a first post of the plurality of posts causes the membrane to have a first length; and while the membrane is in a second configuration, a second post of the plurality of posts causes the membrane to have a second length, different from the first length; wherein the membrane is configured to transmit an ultrasonic signal at a first frequency, corresponding to the first length, when a signal having a first DC voltage component is applied to the first electrode, and wherein the membrane is configured to transmit an ultrasonic signal at a second frequency, corresponding to the second length, when a signal having a second DC voltage component is applied to the first electrode.