Patent ID: 6052415
Filing Date: 2000-04-18
Classification: H04N

Abstract:
An MPEG digital video decoder system for decoding an encoded digital video signal, said system comprising:a variable length code (VLC) decoder for receiving encoded data of the encoded digital video signal and for producing therefrom decoded data;an inverse quantizer (IQ) coupled to the VLC decoder for dequantizing the decoded data to produce therefrom dequantized, decoded data;a discrete cosine transform inverter (IDCT) coupled to the IQ for transforming the dequantized, decoded data from frequency domain to spatial domain, said spatial domain, dequantized decoded data including difference data;a motion compensator (MC) and adder for receiving reference data within the encoded digital video signal and said difference data from the IDCT to form motion compensated pictures therefrom; anderror detection logic coupled to at least one of said VLC decoder, IQ, IDCT and MC for detecting an illegal condition within at least one of said IQ, IDCT and MC during decoding of said encoded digital video signal, wherein said illegal condition comprises at least one of a VLC decoder fixed table error, a VLC/IQ control error, an IQ level overrun, an IQ/IDCT buffer error, a MC idle error and a MC macroblock start error.