IEEE 1631-2008 pdf free.IEEE Recommended Practice for Measurement of 8-VSB Digital Television Transmission Mask Compliance for the USA.
This recommended practice provides a standardized body of theory, techniques. and procedures for measuring the spectral characteristics of 8-VSI3 transmitters used for terrestrial transmission of digital television (D1V) in the frequency range near their assigned channels. Essential characteristics are specified and measurement procedures are given that ensure that all parties will obtain comparable results. The theory and techniques presented are applicable to all 8-VSB transmitters. However, the specification and interpretation of these measurements is primarily focused on DTV transmitters used within the United States of America.
2. Normative references
The following referenced documents are indispensable for the application of this document (i.e., they must be understood and used, so each referenced document is cited in text and its relationship to this document is explained). For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments or corrigenda) applies.
3. Definitions
For the purposes of this document, the Ibliowing terms and definitions apply. The glossary in Annex C and The Authoriiathe Dicaonarv of IEEE Standards Terms [B5]3 should be referenced for terms not defined in this clause.
3.1 band poer nieasurenient (also called channel power): A measurement system included in most measurement instruments that automatically measures the total average power of the signal(s) present within a frequency range selected by the user.
3.2 channel: The nominal specified range of frequencies assigned to each 6 MI-Iz television channel in North America.
NOTE—See 4.2.
3.3 channel edge: The upper or lower edge of the 6-MHz-wide channel occupied by the 8-VSB signal
from a DTV transmitter.
3.4 channel filter: A band-pass filter typically used at the output of a DTV transmitter to limit its out-of-
channel emissions. Sm.: emissions mask filter.
NOTE—See Figure 21 or Figure 22.
3.5 dB1: An amplitude measure of spectral details of an 8-VSB signal where the amplitude of the noise-like signal is either measured across a 500 kHz range of frequencies or normalized to a 500 kHz bandwidth, and then expressed as a logarithmic ratio to the total average power of the 8-VSB signal within its 6 MHz channel.IEEE 1631 pdf free download.