公开(公告)号：CA2348238C

公开(公告)日：2005-03-01

申请号：CA2348238

申请日：2001-05-23

Applicant: LUCENT TECHNOLOGIES INC

Inventor： SEN MOUSHUMI ,  YANG KYEONG HO ,  FARYAR ALIREZA FARID

IPC: H03M7/30 ,  H04N7/26 ,  H04N7/30

Abstract: Methods and apparatus for performing near lossless-concatenated N-level constrained quantization Hadamard transform decoding are provided. Accordingly, the present invention provides a transform-based coding technique, where the coding loss introduced during repeated encoding and decoding is reduced to a substantial ly insignificant level. This is accomplished by employing a constrained quantization and inverse quantization operation in each level of encoding/decoding in the decoder. In this manner, the concatenation error between each level of a decoder is reduced to a substantially minimum level and the quantization error introduced during quantization operations, i.e., originally at the encoder and in each level of the decoder, is substantially reduced. Thus, the decoded bit stream that is output at the N-th level of the decoder is substantially the same as the original bit stream provided to the input of the encoder.

公开(公告)号：DE60100026T2

公开(公告)日：2003-04-30

申请号：DE60100026

申请日：2001-05-22

Applicant: LUCENT TECHNOLOGIES INC

Inventor： FARYAR ALIREZA FARID ,  SEN MOUSHUMI ,  YANG KYEONG HO

IPC: H03M7/30 ,  H04N7/26 ,  H04N7/30

Abstract: Methods and apparatus for performing near lossless-concatenated N-level constrained quantization Hadamard transform decoding are provided. Accordingly, the present invention provides a transform-based coding technique, where the coding loss introduced during repeated encoding and decoding is reduced to a substantially insignificant level. This is accomplished by employing a constrained quantization and inverse quantization operation in each level of encoding/decoding in the decoder. In this manner, the concatenation error between each level of a decoder is reduced to a substantially minimum level and the quantization error introduced during quantization operations, i.e., originally at the encoder and in each level of the decoder, is substantially reduced. Thus, the decoded bit stream that is output at the N-th level of the decoder is substantially the same as the original bit stream provided to the input of the encoder.