Method of and apparatus for converting digital data between data formats
First Claim
1. A method of converting digital data encoded in a first format into digital data encoded in a second format wherein the data of the first format comprises a series of words representing a first staircase approximation of an analog signal having a sequence of levels of equal duration and the data of the second format represents a second staircase approximation of the analog signal having levels of unequal duration, the method comprising the steps of:
- (a) analyzing a number of words of the first format to detect the upper bandwidth limit of the analog signal in a portion thereof represented by such words;
(b) determining the amplitude of the analog signal at the beginning of the portion regardless of whether such amplitude is represented by a word of the first format; and
(c) developing a word of the second format having a first plurality of bits encoded with a representation of the amplitude of the analog signal at the beginning of the portion and a second plurality of bits encoded with a representation of the upper bandwidth limit.
1 Assignment
0 Petitions
Accused Products
Abstract
A method of and apparatus for converting between first and second digital data formats is disclosed whereby digital words of the first format are analyzed to detect an upper bandwidth limit of a corresponding analog signal in an interval thereof defined by such words and to determine the level of the analog signal at the beginning of such interval. A digital word of the second format is encoded with first and second pluralities of bits representing the determined upper bandwidth limit and the level of the corresponding analog signal at the beginning of the interval.
17 Citations
14 Claims
-
1. A method of converting digital data encoded in a first format into digital data encoded in a second format wherein the data of the first format comprises a series of words representing a first staircase approximation of an analog signal having a sequence of levels of equal duration and the data of the second format represents a second staircase approximation of the analog signal having levels of unequal duration, the method comprising the steps of:
-
(a) analyzing a number of words of the first format to detect the upper bandwidth limit of the analog signal in a portion thereof represented by such words; (b) determining the amplitude of the analog signal at the beginning of the portion regardless of whether such amplitude is represented by a word of the first format; and (c) developing a word of the second format having a first plurality of bits encoded with a representation of the amplitude of the analog signal at the beginning of the portion and a second plurality of bits encoded with a representation of the upper bandwidth limit. - View Dependent Claims (2, 3, 4, 5, 6, 7)
-
-
8. A method of converting a first series of words representing an analog signal into a second series of words also representing the analog signal, each word of the first series defining the level of the analog signal at the beginning of an interval thereof, the intervals being contiguous and of equal duration, each word of the second series having a first plurality of bits defining a voltage level and a second plurality of bits defining the duration of such level wherein the durations of the levels defined by the second series of words are not of equal length, the method comprising the steps of:
-
(a) selecting a number of words of the first series representing a predetermined portion of the analog signal; (b) analyzing the number of words to determine the upper bandwidth limit of the predetermined portion; (c) determining the level of the analog signal at the beginning of the predetermined portion regardless of whether such level is represented by one of the first series of words; (d) developing a word of the second series wherein the first plurality of bits represent the determined level of the analog signal at the beginning of the predetermined portion and wherein the second plurality of bits are encoded in accordance with the detected upper bandwidth limit; (e) selecting a further number of words of the first series representing a further predetermined portion of the analog signal; and (f) repeating steps (b)-(e) for each further predetermined portion to derive the second series of words. - View Dependent Claims (9, 10, 11, 12, 13, 14)
-
Specification