Patent ID: 8570832

Claim:
An acoustic transceiver assembly comprising: a housing having at least one inner wall defining a cavity, the cavity having a first end and a second end defining an axis of the acoustic transceiver assembly; an oscillator provided in the cavity, the oscillator comprising: a transducer element positioned at the first end of the cavity, a backing mass positioned adjacent the transducer element, wherein the transducer element is disposed between the backing mass and the first end of the cavity; a blocking element positioned adjacent the oscillator in the cavity, the blocking element being adapted to restrain a portion of the backing mass from lateral movement relative to the axis of the acoustic transceiver assembly, and to permit oscillations of the backing mass, wherein the blocking element restrains the backing mass at a first pressure and releases the backing mass at a second pressure to permit oscillations of the backing mass; at least one blocking spring biased against the blocking element; and an equalizing chamber having a port hole open to receiving the first pressure and/or the second pressure.