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2004 Edition, February 19, 2004

Complete Document

American National Standard Specification for Octave-Band and Fractional-Octave-Band Analog and Digital Filters

Includes all amendments and changes through Reaffirmation Notice , June 15, 2009

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Description / Abstract:

This standard provides performance requirements for analog, sampled-data, and digital implementations of bandpass filters that comprise a filter set or spectrum analyzer. The extent of the passband region of a filter's relative attenuation characteristic is a constant percentage of the midband frequency for all filters of a given bandwidth. An instrument complying with the requirements of this standard may contain any number of bandpass filters covering any desired frequency range. Methods for testing the performance of filters are given in an informative annex.

Performance requirements are provided for three filter classes designated class 0, class 1, and class 2. Allowed tolerance limits increase as the class number increases.

Bandpass filters conforming with the performance requirements of this standard may be part of various measurement systems or may be an integral component of a specific instrument and shall operate in real time. Performance requirements apply to any method that is selected by the manufacturer to implement the design of the filters.

Instruments conforming with the requirements of this standard are capable of provi ding frequencyband- filtered spectral information for a wide variety of signals, for example, time-varying, intermittent, and steady; broadband and discrete frequency; and long and short durations. For applications involving transient signals, different realizations of filters meeting the requirements of this standard may give different results.