Patent · US Expired

Tunable digital filter arrangement

US6141672A · kind A · utility

7Cited by

7References

5Claims

0Family size

Assignee

Temic Telefunken Microelectronik · DE

Inventors

Dieter Driendl · Deggenhausertal, DE
Erwin Kessler · Bad Saulgau, DE
Kurt Kleiner · Meßkirch, DE
Wolfgang Schulter · Meersburg, DE

Key dates

Filing date	Aug 19, 1998
Grant date	Oct 31, 2000
Priority date	—
Expiry date	Aug 19, 2018

Classification

Technology area (CPC H)Electricity
CPC primaryH03H17/04
WIPO fieldBasic communication processes
WIPO sectorElectrical engineering

Abstract

A tunable digital filter arrangement realizes the difference equation EQU y[n]=.alpha..multidot.(x[n].+-.x[n-1])+(1-2.alpha.).multidot.y[n-1] and in which the limiting frequency can be tuned linearly by means of only one tuning parameter .alpha.. The tuning range is limited solely by the sampling rate and bit width of the registers and can also accept in particular very low frequencies. The filter arrangement can therefore also be used in particular for prefiltering sampled and digitized measured values of the motor current for load-dependent motor control in the extremely slow speed range. By selecting "+" as the operator ".+-.", a low-pass characteristic results; selecting "-" as the operator results in a high-pass filter. It is possible to cascade several low-pass and/or high-pass filters.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.