| 摘要 |
PROBLEM TO BE SOLVED: To provide a mute method which always gives a small offset amount of DC offset and has a short detection wait time Td. SOLUTION: A circuit between a point A terminal to which an AC input signal Sin to be muted by an execution trigger of a mute control signal D1 and a point B terminal is opened. By the execution trigger, a potential of an AC ground AC GND is selected and is outputted as a reference potential. A potential at the point B terminal is made equal to the reference potential, and a cross timing D8 at which the potential at the point B terminal is equal to the reference potential is detected. A circuit between the AC ground ACGND and the point B terminal is short-circuited by the cross timing D8. COPYRIGHT: (C)2005,JPO&NCIPI |
