Loudspeaker system and noise canceling apparatus

A loudspeaker system comprising:

• a flat loudspeaker unit having a planar diaphragm;
• and
• a microphone having a diaphragm located in the same plane as the diaphragm of the flat loudspeaker unit.

A loudspeaker system comprising a plurality of flat loudspeaker units in which planar diaphragms are located in the same plane, wherein at least one of the plurality of flat loudspeaker units is used as a microphone.

A loudspeaker system comprising:

• a flat loudspeaker unit provided with a plurality of magnets disposed in the same plane and a planar diaphragm having a plurality of coils which form pairs with the plurality of magnets;
• wherein one or more of the plurality of coils are electrically disconnected from the other coils, and the electrically disconnected coils are used as coils for a microphone while a portion of the diaphragm where the electrically disconnected coils are provided is used as a diaphragm of the microphone.

A noise canceling apparatus comprising:

• a plurality of flat loudspeaker units in which planar diaphragms are disposed in the same plane;
• and
• a loudspeaker controller which utilizes at least one of the plurality of flat loudspeaker units as a microphone and outputs a sound having an opposite phase to a sound picked up by the flat loudspeaker unit used as the microphone from another loudspeaker unit not used as the microphone.

A noise canceling apparatus comprising:

• a flat loudspeaker unit provided with a plurality of magnets disposed in the same plane and a planar diaphragm having a plurality of coils which form pairs with the plurality of magnets, one or more of the plurality of coils being electrically disconnected from the other coils, the electrically disconnected coils being used as coils for a microphone while a portion of the diaphragm where the electrically disconnected coils are provided is used as a diaphragm of the microphone;
• and
• a loudspeaker controller transmitting electric signals to the other coils in order to output a sound having an opposite phase to a sound picked up by the microphone from a portion of the diaphragm where the other coils are provided.