Abstract: A duty cycle correction circuit includes a duty correction circuit, an information generation circuit and a duty control circuit. The duty correction circuit corrects a duty rate of an input clock signal based on a duty control code to generate an output clock signal. The information generation circuit compares a difference between operation power voltages based on an operation mode to generate voltage information. The duty control circuit receives the voltage information from the information generation circuit and generates the duty control code that includes the voltage information based on a duty rate of the output clock signal.

Abstract: There is provided an audio mode automatic switching method, which automatically recognizes kinds of input audios to automatically switch and output audio mode. The method includes the steps of: collecting sample audio data in advance, then analyzing a feature of the sample audio data and extracting features according to kinds of audios; and if a listening audio is inputted, pattern-matching a feature of the listening audio with the features according to the kinds of audios in the step (a) to determine the kind of the listening audio and automatically switch the audio mode according to the determined audio kind.