| 摘要 |
PROBLEM TO BE SOLVED: To provide a pop noise preventing circuit capable of preventing pop noise without extending muting time. SOLUTION: The pop noise preventing circuit is provided with a current output circuit for outputting a current that gradually increases from 0 as a reference voltage (Vref) of a headphone amplifier rises from 0, rapidly increases after the reference voltage (Vref) exceeds a second voltage (v2), and gradually increases after the reference voltage (Vref) exceeds a first voltage (v1). The reference voltage (Vref) of the headphone amplifier is raised to a specified voltage on the basis of the output of the current output circuit. COPYRIGHT: (C)2005,JPO&NCIPI
|
