Edward F. Drocella Jr. and David S. Anderson

Abstract: The National Telecommunications and Information Administration (NTIA) is developing a handbook documenting the best practices in spectrum engineering. This technical memorandum provides a methodology to determine the average and peak power level at the output of a filter with a linear swept frequency pulse train input to the filter. Using this method, NTIA calculated two correction factors necessary to accurately compute the interference power level of a system that employs linear swept frequency signals. The two correction factors enable the con-version of the peak power at the filter input to the peak power or average power at the output. These correction factors cover the case where the peak input power is stated in dB relative to a reference power (e.g., dBW). NTIA also carried out, as part of this technical memorandum, measurements of linear swept frequency signals at the input and output of a variety of filter bandwidths. A comparison of measured and calculated correction factors showed the values to be in good agreement. The measurements carried out in this technical memorandum resulted in the development of a general procedure for measuring the emissions of a system employing linear swept frequency techniques. This method enables an accurate measurement of the emissions from which to assess compatibility with other radio services. The correction factors and the measurement procedure described in this technical memorandum will be used in the development of the Best Practices Handbook.

Keywords: subjective testing; audio delay; audio offset; differential delay; multimedia quality; audio-video synchronization

Disclaimer: Certain commercial equipment, components, and software may be identified in this report to specify adequately the technical aspects of the reported results. In no case does such identification imply recommendation or endorsement by the National Telecommunications and Information Administration, nor does it imply that the equipment or software identified is necessarily the best available for the particular application or uses.

For questions or information on this or any other NTIA scientific publication, contact the ITS Publications Office at ITSinfo@ntia.gov or 303-497-3572.

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