Abstract: This invention describes an electromechanical sound apparatus which can be utilized as part of a sound system such as an intercom or as an acoustic repeater. The apparatus includes a loudspeaker having a diaphragm and a coil. The coil receives variations of electric energy and causes the diaphragm to vibrate. An electromechanical sound (sensor/microphone) transducer is connected to the loudspeaker. The transducer includes conductive supports mounted onto the loudspeaker diaphragm and a weighted conductive bar loosely coupled to the supports. Electric energy is connected across the conductive supports. As the diaphragm vibrates, the vibrations are transmitted through the conductive supports to the bar, which interrupts the electrical energy and converts the vibrations into electrical energy variations. The loudspeaker diaphragm can be utilized to directly receive acoustic energy for the transducer, or as a standard loudspeaker output unit.

Abstract: This invention describes an electromechanical amplifying sound transducer including a diaphragm which responds to input energy, such as acoustical waves and mechanical pulses, and vibrates in response thereto. Conductive supports mounted onto the diaphragm are adapted to be interconnected to a source of electrical energy. A weighted conductive bar is loosely coupled to the supports and interconnects them. The supports transmit the vibrations to the bar whereby the bar can control the electrical energy delivered from the source of electrical energy so that the acoustic waves or mechanical pulses are converted into amplified electrical waves.