Title :
Analyzing the FCC´s DTV spectral emission mask and potential degradation to adjacent channels due to antenna pattern differences
Author :
Eilers, Carl ; Sgrignoli, Gary
Author_Institution :
Zenith Electron. Corp., Glenview, IL, USA
fDate :
3/1/1998 12:00:00 AM
Abstract :
The FCC DTV spectral emission mask is analyzed with an NTSC subjective noise weighting function to determine the desired NTSC to undesired adjacent channel DTV signal ratio at the threshold of visibility of interference. Factors which alter the NTSC/DTV adjacent channel signal ratio at various receiving locations within the NTSC service are examined: (1) the azimuth patterns of the NTSC and DTV broadcast antennas; (2) the elevation patterns of the NTSC and DTV broadcast antennas; and (3) the centers of radiation of the NTSC and DTV broadcast antennas. These factors together with the NTSC/DTV authorized power ratio may make the DTV spillover spectrum exceed acceptable picture (and sound) interference levels even though compliance with the FCC DTV spectral emission mask is met. Spectral shaping solutions are examined by use of the NTSC subjective noise weighting
Keywords :
adjacent channel interference; antenna radiation patterns; broadcast antennas; digital television; frequency allocation; noise; spectral analysis; television antennas; television interference; television stations; DTV spectral emission mask; FCC; NTSC; TV stations; adjacent channels; antenna pattern differences; antenna radiation; authorized power ratio; azimuth patterns; broadcast antennas; desired to undesired adjacent channel signal ratio; elevation patterns; interference levels; receiving locations; spectral shaping; spillover spectrum; subjective noise weighting function; Acoustic noise; Azimuth; Broadcasting; Digital TV; FCC; Interference; Noise shaping; Receiving antennas; Signal analysis; Signal to noise ratio;
Journal_Title :
Broadcasting, IEEE Transactions on
