US 6,661,846 B1 · Adaptive clocking mechanism for digital video decoder

Abstract

An adaptive clocking mechanism is provided for a digital display system. The digital display system includes a clock recovery system, for recovering a system time clock from a video bit-stream generated at an encoder, and a decoding system for decoding and decompressing the video bit-stream at a frame rate. The adaptive clocking mechanism operates to determine, from video format information transmitted from the encoder, the occurrence of a frame rate at which a transmitted signal is encoded that differs from a frame rate expected by the decoder. Upon such a determination, the adaptive clocking mechanism further operates to select a modifier from a group of modifiers based on format information derived from the video bit-stream, including the encoded frame rate. The selected modifier is then applied to a synchronization function of the decoder in a manner to bring the decoder operation into synchronization with the non-expected encoder frame rate.

Claims17

Dependent claims

An adaptive clock recovery system, comprising:

a receiver operable to obtain a reference clock frequency and a video frame rate from a video bit-stream;
a selector operable to provide a modifier as a function of comparing said received video frame rate with an expected video frame rate, said modifier being substantially one of 1001/1000, 1/1, or 1000/1001;
and
a clock generator operable to produce a reference clock at a frequency that is substantially said reference clock frequency multiplied by said modifier.

1 more element

Dependencies are inferred from the claim text.

Adaptive clocking mechanism for digital video decoder

Life of this patent

Adaptive clocking mechanism for digital video decoder

Life of this patent

Abstract

Claims17