METHOD OF FILTERING A SIGNAL AND OF OBTAINING FILTER COEFFICIENTS
First Claim
Patent Images
1. Method of filtering a signal, including:
- determining a class of a section (23;
39) of the signal obtained as input, wherein the determination of the class includes calculating a signal section (28;
41) comprising at least a component representative of a derivative of at least a first order of the input signal section (23;
39) and applying a quantisation operation to the calculated signal section (28;
41), wherein, in the quantisation operation, a quantisation step is adapted to a dynamite range of the calculated signal section (28;
41); and
selecting a digital filter associated with the class from a plurality of available filters.
2 Assignments
0 Petitions
Accused Products
Abstract
A method of filtering a signal includes determining a class of a section (23;39) of the signal obtained as input, wherein the determination of the class includes calculating a signal section (28;41) comprising at least a component representative of a derivative of at least a first order of the input signal section (23;39) and applying a quantisation operation to the calculated signal section (28;41). A digital filter associated with the class is selected from a plurality of available filters. In the quantisation operation, a quantisation step is adapted to a dynamic range of the calculated signal section (28;41).
11 Citations
15 Claims
-
1. Method of filtering a signal, including:
-
determining a class of a section (23;
39) of the signal obtained as input, wherein the determination of the class includes calculating a signal section (28;
41) comprising at least a component representative of a derivative of at least a first order of the input signal section (23;
39) and applying a quantisation operation to the calculated signal section (28;
41), wherein, in the quantisation operation, a quantisation step is adapted to a dynamite range of the calculated signal section (28;
41); andselecting a digital filter associated with the class from a plurality of available filters. - View Dependent Claims (2, 3, 4, 5, 6, 8, 9, 15)
-
-
7. Device for filtering a signal, including:
-
an input (8) for receiving the signal; a device component for determining a class of a section (23;
39) of the signal obtained as input, the device component including a signal processing component (9) for calculating a signal section (28;
41) comprising at least a component representative of a derivative of at least a first order of the input signal section (23;
39) and a signal processing component (9) for applying a quantisation operation to the calculated signal section (28;
41), wherein the device is configured to implement the quantisation operation such that a quantisation step is adapted to a dynamic range of the calculated signal section (28;
41); anda switch for switching between a plurality of available digital filters.
-
-
10. Method of obtaining filter coefficients of a plurality of filters, including:
-
obtaining a plurality of test signal sections (55a-n) and associated target signal values (60a-n), each test signal section (55a-n) associated with one of a plurality of classes; for each class, optimising a set of filter coefficients of an associated filter such that filtered versions of the test signal sections (55a-n) associated with that class best approximate their associated target signal values (60a-n); and associating each optimised set of filter coefficients with a class code (59) obtainable by; for any test signal section (55) associated with the class associated with the optimised set of filter coefficients, calculating a signal section (57) comprising at least a component representative of a derivative of at least a first order the test signal section (55) and applying a quantisation operation to the calculated signal section (57), wherein, in the quantisation operation, a quantisation step is adapted to a dynamic range of the calculated signal section (57). - View Dependent Claims (11, 12, 13, 14)
-
Specification