Patent ID: 7881592

Claim:
A digital audio/video playback system capable of controlling audio and video playback speed for decoding a digital audio/video signal and outputting the signal through an output device, the digital audio/video playback system comprising: a loader for receiving the digital audio/video signal; a parser for resolving the digital audio/video signal into a video bitstream and an audio bitstream, the parser being signal-connected to the loader; a video decoder for receiving the video bitstream and decoding the video bitstream to a decoded video, the video decoder being signal-connected to the parser; an audio decoder for receiving the audio bitstream and decoding the audio bitstream to a decoded audio, the audio decoder being signal-connected to the parser; and a playback speed controller for adjusting the sound frequency of the decoded audio based on a set playback speed and outputting the decoded audio and the decoded video at the set playback speed to the output device, the playback speed controller being signal-connected to the video decoder and the audio decoder, wherein the set playback speed is faster, slower, or equal to a normal playback speed; when the set playback speed is slower than the normal playback speed, the playback speed controller raises the sound frequency of the decoded audio to minimize the distortion of the output tone of the set playback speed with respect to the output tone of the normal playback speed; and when the set playback speed is faster than the normal playback speed, the playback speed controller lowers the sound frequency of the decoded audio to minimize the distortion of the output tone of the set playback speed with respect to the output tone of the normal playback speed.