Patent ID: 6642874
Filing Date: 2003-11-04
Classification: H03M

Abstract:
A method for converting a sequence of elements xn into a sequence of elements yn, wherein each element xn represents a magnitude with at least p-bit resolution and each element yn is an m-bit digital data word, wherein m and p are integers and wherein p>m>0, the method comprising the steps of:a. providing a sequence of elements cn in response to the sequence of elements yn wherein each element cn corresponds to a separate element yn and represents similar a magnitude; b. generating a sequence of elements an, each representing a magnitude proportional to a difference in magnitudes represented by a separate concurrently occurring pair of elements xn and cn; c. filtering the sequence of elements an to produce a sequence of elements dn; d. generating a sequence of elements bn in response to the sequence of elements dn and a sequence of elements rn, wherein each element bn represents with at least p-bit resolution a difference in magnitudes represented by a separate concurrently occurring pair of elements dn and rn; e. generating each element yn in response to a corresponding one of elements bn, wherein each element yn represents with m-bit resolution a same magnitude its corresponding element of the bn sequence represents with at least p-bit resolution; and f. generating the sequence of elements rn as a function of a quantization error differences between magnitudes represented by corresponding pairs of elements bn and yn.