Patent ID: 7890071

Claim:
A handheld audio system, comprising: a radio signal decoder integrated circuit that produces: a digital left channel signal and a digital right channel signal from a received radio signal in accordance with a first enable signal; and a system clock in response to a second enable signal, the second enable signal generated when a first power supply voltage from a DC-to-DC converter of a digital audio processing integrated circuit reaches a desired level; and the digital audio processing integrated circuit, wherein the digital audio processing integrated circuit is a different integrated circuit than the radio signal decoder integrated circuit and is coupled to the radio signal decoder integrated circuit, and wherein the digital audio processing integrated circuit comprises: the DC-to-DC converter to produce at least one power supply voltage that includes the first power supply voltage, wherein the at least one power supply voltage is based on the system clock when the DC-to-DC converter receives output of the system clock from the radio signal decoder integrated circuit; and a processing module to produce audio signals for audio playback from at least one of the digital left and right channel signals and a stored digital audio file.