Mechanically-coupled microphone-speaker unit and intercom system

摘要

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.