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Digital Filter Delay Compensation Method

IP.com Disclosure Number: IPCOM000060003D
Original Publication Date: 1986-Feb-01
Included in the Prior Art Database: 2005-Mar-08
Document File: 1 page(s) / 12K

Publishing Venue

IBM

Related People

Einkauf, MA: AUTHOR

Abstract

The outputs of digital filters are often used in signal processing applications to determine the characteristics of a signal.

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Digital Filter Delay Compensation Method

The outputs of digital filters are often used in signal processing applications to determine the characteristics of a signal.

Delays inherent in digital filters of varying type and order often cause filter outputs to be asynchronous. This tends to make a decision about signal characteristics more difficult. There are several known methods for compensating for this delay, but the methods require additional elements to be added to the algorithm. A method of delay compensation which requires only slight modification of an existing element and does not require any additional elements is described. In a digital signal processing system where signal characteristics are determined by output levels of various filters, it is very important that these filter outputs remain synchronized. If delays inherent in the filters are not approximately equal, it takes different amounts of time for the same input signal to pass through the filters. This often causes erroneous decisions based on the filter outputs. Traditional delay compensation techniques rely on delay pre-emphasis filters to delay the inputs to the various filters, different amounts so the resulting outputs are synchronized.

In many signal processing applications, the amount of processing required to implement a function must be minimized. In many cases, it is necessary to eliminate all unnecessary algorithm elements. Therefore, it becomes necessary for element functions to be combined. This method of delay compensation can be implemented in an element which is essential to the pr...