Patent ID: 8199929

Claim:
An anti-pop circuit, wherein said circuit is coupled with a sound outputting device to prevent a “pop” sound from being mixed into a sound signal, a power is coupled with said device, and said sound signal is inputted from an input end of said device, comprising: a control signal generator for generating a control signal with a high level state and a low level state; a first diode coupling with said device, said sound signal is transferred to said first diode when said first diode is in a forward bias state, and said sound signal is outputted from an output end of said device when said first diode is in a reverse bias state, wherein said first diode is in a forward bias state when said control signal is in a low level state, and said first diode is in a reverse bias state when said control signal is in a high level state, a charge/discharge circuit including a capacitor and a resistor, wherein said capacitor and said resistor are connected in a common contact and said first diode is connected to said common contact; and a second diode connected to said common contact, wherein when said control signal is in a high level state, said control signal charges said capacitor through said resistor and when said control signal is changed to a low level state, said capacitor is discharged through said second diode and said resistor, wherein said control signal is outputted from a general purpose input/output pin.