Digital loudspeaker and sound reproduction system employing such a loudspeaker

摘要

A speaker apparatus capable of reproducing from low-pitched to high-pitched sounds and a voice reproduction system employing the same. The speaker apparatus includes a speaker unit in which a primary coil (1) is mounted in a gap portion between a plate (32) and a centre pole (12) of a magnetic circuit, a secondary coil (2) is disposed within the gap (23) in such a manner as to be fixed to a vibration plate (32), and a secondary electric current is induced in the secondary coil (2) by a signal current flowing through a primary coil (1), thereby operating the vibration plate (32); and a speaker driving circuit which drives the primary coil of the speaker unit with a digital sound signal.