Teledyne-lecroy DFP2 - Digital Filter Package 2 Bedienungsanleitung PDF herunterladen (Seite 7)

DFP2 Option

923134 Rev A ISSUED: June 2013 5

Kinds of Filters

Low-pass Filter

Low-p

ass filters are useful for eliminating accumulated

high-frequency noise and interference, and for

canceling high-frequency background noise.

Sample applications are in datacom,

telecommunications, and disk drive and optical

recording analysis for accurate RF signal detection.

Band 1: Pass Band — DC to top of the transition

region; signal passes unattenuated.

Band 2: Transition Region — edge frequency to edge

frequency plus width; increasing attenuation.

Band 3: Stop Band — above end of transition region;

signal is highly attenuated.

High-pass Filter

High

-pass filters are useful for eliminating DC and low-

frequency components. Sample applications include

Disk Drive and Optical Recording analysis (emulation

of the SLICING function).

Band 1: Stop Band — DC to bottom of the transition

region; highly attenuated.

Band 2: Transition Region — edge frequency minus

width to edge frequency; decreasing attenuation.

Band 3: Pass Band — above edge frequency; signal

passes unattenuated.

1. Filters are optimal FIR filters of less than 2001 taps, according to the Parks-MacLellan algorithm described in Digital

Filter Design and Implementation by Parks and Burrus, John Wiley & Sons, Inc., 1987, and then adjusted by windowing

the start and end 20% with a raised cosine for improved time domain characteristics and better ultimate rejection in the

frequency domain, slightly increasing 1

stop-band ripple height.

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Teledyne-lecroy DFP2 - Digital Filter Package 2 Bedienungsanleitung Seite 7