| 摘要 |
<p>A class D amplification device that prevents beats caused by switching operations of a switching power supply (13-17, 40) and a class D amplifier (3, 3a, 3b) from causing noise within a voice band, enables easy control over power supply operations, and offers low power loss is provided. The amplification device includes a means (33) arranged to generate a reference clock, a switching power supply (13-17, 40) that operates at a first frequency at which the frequency of the reference clock is divided, and a triangular wave generation unit (25) arranged to operate at a second frequency higher than the first frequency at which the frequency of the reference clock is divided. The amplification device further includes a class D amplifier (3, 3a, 3b) that performs a switching operation with a pulse whose width has been modulated according to the input signal (6).</p> |
