Starting denoising circuit for starting-up hardware of standalone version set top box

The invention provides a starting denoising circuit for a starting-up hardware of a standalone version set top box. The starting denoising circuit comprises a hardware muting circuit part and a software muting circuit part, wherein the hardware muting circuit part comprises a shutdown muting circuit and a starting-up muting circuit; and a stable direct-current power supply of 5-10V is adopted forthe starting-up muting circuit. According to the invention, the power supply of the starting-up muting circuit is improved, and the problems of starting noises generated at the moment when the set top box is started up or shut down and starting noises of the starting-up hardware when the set top box works with hardware are solved at the same time.