ACTIVE NOTCH FILTER.

Abstract

This report describes the theory of operation and the construction of a device to reject CW interference. The device constitutes a tunable, single frequency rejection filter which uses a phase locked oscillator to obtain a narrow rejection notch in the region of 455 kc. The notch response is obtained by cancelling the signal to be rejected with a locally generated signal of equal amplitude and opposite phase. Automatic phase and amplitude control of the cancellation signal permits the rejection notch to track slow frequency and amplitude changes in the signal being rejected. A notch width of less than 100 cps is obtained with tracking being maintained over a 10 kc bandwidth centered at 455 kc. (Author)

Document Details

Document Type
Technical Report
Publication Date
Apr 01, 1964
Accession Number
AD0438252

Entities

Organizations

  • Georgia Tech

Tags

DTIC Thesaurus Topics

  • Amplitude
  • Automatic
  • Bandwidth
  • Cancellation
  • Construction
  • Filters
  • Frequency
  • Notch Filters
  • Oscillators
  • Rejection

Fields of Study

  • Engineering

Readers

  • Electronics Engineering
  • Radar Systems Engineering.
  • Structural Health Monitoring of Composite Structures.