公开(公告)号：EP1488336A4

公开(公告)日：2006-02-15

申请号：EP03713862

申请日：2003-03-04

Applicant: ST MICROELECTRONICS NV

Inventor： NORDSWORTHY STEVEN R

IPC: H03M3/02 ,  H03M3/04 ,  H04B1/04 ,  G06F17/20

CPC classification number: H04B1/04 ,  H03M3/332 ,  H03M3/424 ,  H03M3/436

Abstract: An Nth-order shaping coder with multi-level quantization and dithered quantizer. The coder (500) is inherently stable and produces a purely white quantization error spectrum. In one exemplary embodiment, the coder is first order, and an improved dither scheme is employed including applying a M-times, e.g. M=2, sample-and-hold to the dither sequence, effectively holding a constant dither for multiple clock cycles. This advantageously results in a reduction of instances where the quantizer jumps over two quantization intervals in one clock cycle without first passing through zero for one clock cycle. Methods for implementing the shaping coder are also disclosed.

公开(公告)号：AU2003217890A8

公开(公告)日：2003-09-22

申请号：AU2003217890

申请日：2003-03-04

Applicant: ST MICROELECTRONICS NV

Inventor： NORDSWORTHY STEVEN R

IPC: H03M3/02 ,  G06F40/00 ,  H03M3/04 ,  H04B1/04 ,  G06F17/20

Abstract: An Nth-order shaping coder with multi-level quantization and dithered quantizer. The coder is inherently stable and produces a purely white quantization error spectrum. In one exemplary embodiment, the coder is first order, and an improved dither scheme is employed including applying a M-times (e.g., M=2) sample-and-hold to the dither sequence, effectively holding a constant dither for multiple clock cycles. This advantageously results in a reduction of instances where the quantizer jumps over two quantization intervals in one clock cycle without first passing through zero for one clock cycle. Methods for implementing the shaping coder are also disclosed.