Patent ID: 7793133

Claim:
A power management method for use in a media system comprising a processing unit, the method comprising: recording a running cycle of the processing unit processing a data unit; generating a gating signal according to the running cycle and a performance requirement, wherein the gating signal comprises a cycle length, and the gating signal gates a cycle to a working clock every other cycle length; adjusting the working clock according to the gating signal to generate an adjusted working clock; providing the adjusted working clock to the processing unit, wherein the processing unit processes another data unit based on the adjusted working clock; comparing the running cycle with the performance requirement; if the running cycle is less than the performance requirement, generating the gating signal, and reducing the cycle length from a specific length, slowing the working clock; and if the running cycle exceeds the performance requirement, generating the gating signal, and increasing the cycle length from the specific length, accelerating the working clock.