Search Results

The search returned 1,237 publication(s) on its.ntia.gov.

Margaret H. Pinson and Stephen Wolf, “Video scaling estimation technique,” Technical Memorandum NTIA TM-05-417, January 2005

Digital video compression algorithms are being deployed that spatially stretch or shrink the video picture. Although small changes in spatial scaling are not usually noticeable to viewers, objective video quality measurement systems may be adversely...

Margaret H. Pinson and Stephen Wolf, “A New Standardized Method for Objectively Measuring Video Quality,” Journal Article, September 2004

The National Telecommunications and Information Administration (NTIA) General Model for estimating video quality and its associated calibration techniques were independently evaluated by the Video Quality Experts Group (VQEG) in their Phase II Full R...

M. E. DeWeese, Margaret A. Luebs, and H. L. McCullough, “Significant Papers from the First 50 years of the Boulder Labs,” Special Publication NTIA SP-04-416, August 2004

The Department of Commerce Boulder Labs were dedicated on September 14, 1954, in the shadow of World War II, and at the dawn of a bright future. This volume presents a snapshot of our research accomplishments in the half century since then. During t...

Stephen D. Voran, “Compensating for Gain in Objective Quality Estimation Algorithms,” Conference Paper, May 2004

When objectively estimating speech, audio, or video quality, it is often necessary to compensate for a system gain or to “gain match” two or more signals. One can take three views of a system, leading to three different definitions of gain, and thre...

Stephen D. Voran, “A Bottom-Up Algorithm for Estimating Time-Varying Delays in Coded Speech,” Conference Paper, May 2004

In packetized speech transmission, end–to–end delay can vary, even over short timescales. Estimating the resulting speech delay histories is critical to diagnostic and quality estimation efforts. We present a new bottom–up algorithm for estimating ti...

Brent L. Bedford, Alakananda Paul, and James C. Richards, “Potential Interference from Broadband Over Power Line (BPL) Systems to Federal Government Radiocommunications at 1.7–80 MHz: Phase 1 Study Volumes I and II,” Technical Report NTIA TR-04-413, April 2004

The objectives of this technical study are to define interference risks from operation of BPL systems under field strength limits and associated compliance measurement procedures specified in Part 15 of the Commissions rules, identify interference ri...

Margaret H. Pinson and Stephen Wolf, “The impact of monitor resolution and type on subjective video quality testing,” Technical Memorandum NTIA TM-04-412, March 2004

This memorandum compares subjective video quality test results from a professional cathode ray tube (CRT) television monitor with that of a consumer liquid crystal display (LCD) video phone monitor. The CRT monitor supported the full ITU-R Recommend...

J. Wayde Allen, “Gain characterization of the RF measurement path,” Technical Report NTIA TR-04-410, February 2004

In radio frequency (RF) measurements the gain (or loss) of the signal path connecting the measurement equipment to the measurement reference plane must be accounted for. This tutorial paper discusses the various definitions of gain, and how to deter...

Michael H. Brill et al., “Accuracy and Cross-Calibration of Video Quality Metrics: New Methods from ATIS/T1A1,” Journal Article, February 2004

Video quality metrics (VQMs) have often been evaluated and compared using simple measures of correlation to subjective mean opinion scores from panels of observers. However, this approach does not fully take into account the variability implicit in t...

Stephen Wolf, “Color correction matrix for digital still and video imaging systems,” Technical Memorandum NTIA TM-04-406, December 2003

This document discusses a method for correcting inaccurate color output by digital still and video imaging systems. The method uses a known reference image together with a least–squares algorithm to estimate the optimal color channel mixing matrix t...

Peter B. Papazian and Michael G. Cotton, “Relative Propagation Impairments between 430 MHz and 5750 MHz for Mobile Communication Systems in Urban Environments,” Technical Report NTIA TR-04-407, December 2003

Radiowave propagation measurements made in an urban area of Denver, Colorado, are described. Wideband, impulse response measurements were made at 4 carrier frequencies from 430 MHz to 5750 MHz. These measurements were made using a mobile measurement...

“FY 2003 Technical Progress Report,” Technical Progress Report, December 2003

The Institute for Telecommunication Sciences (ITS) is the research and engineering laboratory of the National Telecommunications and Information Administration (NTIA) of the U.S. Department of Commerce (DOC). ITS provides technical support to NTIA in...

Bernard Joiner, “Receiver Spectrum Standards: Phase 1 – Summary of Research into Existing Standards,” Technical Report NTIA TR-03-404, November 2003

As part of the overall spectrum management process, the National Telecommunications and Information Administration (NTIA) and the Federal Communications Commission (FCC) have developed radio regulations to help ensure that the various radio services...

J. Wayde Allen and Ted Mullen, “Digital television (DTV) field strength and video quality study,” Technical Memorandum NTIA TM-03-405, August 2003

A particular concern about digital television (DTV) broadcasts is whether such broadcasts have sufficient power to be received using inexpensive indoor antennas located inside a typical home. To test this, the Institute for Telecommunication Science...

Margaret H. Pinson and Stephen Wolf, “Comparing Subjective Video Quality Testing Methodologies,” Conference Paper, July 2003

International recommendations for subjective video quality assessment (e.g., ITU-R BT.500-11) include specifications for how to perform many different types of subjective tests. Some of these test methods are double stimulus where viewers rate the qu...

Margaret H. Pinson and Stephen Wolf, “An Objective Method for Combining Multiple Subjective Data Sets,” Conference Paper, July 2003

International recommendations for subjective video quality assessment (e.g., ITU-R BT.500-11) include specifications for how to perform many different types of subjective tests. In addition to displaying the video sequences in different ways, subject...

J. Randy Hoffman, Eldon J. Haakinson, and Yeh Lo, “Measurements To Determine Potential Interference to Public Safety Radio Receivers from Ultrawideband Transmission Systems,” Technical Report NTIA TR-03-402, June 2003

This report describes laboratory measurements to determine the extent and nature of interference to Public Safety radio receivers by ultrawideband (UWB) signals. Two Public Safety radio receivers from different manufacturers were tested in the 138-M...

Peter B. Papazian, Yeh Lo, John J. Lemmon, and Michael J. Gans, “Measurements of channel transfer functions and capacity calculations for a 16x16 BLAST array over a ground plane,” Technical Report NTIA TR-03-403, June 2003

Wideband channel transfer function measurements were made for a 16-element transmit and 16-element receive, multiple input, multiple output (MIMO) antenna array. The measurements were conducted using the National Institute of Standards and Technolog...

Stephen D. Voran, “Perception of Temporal Discontinuity Impairments in Coded Speech - A Proposal for Objective Estimators and Some Subjective Test Results,” Conference Paper, May 2003

Temporal discontinuities in received speech are a reality of Internet Telephony or Voice over Internet Protocol (VoIP) systems. These relatively new impairments pose unique challenges to objective estimators of perceived speech quality. We suggest t...

J. Wayde Allen and Timothy X. Brown, “Proceedings of the International Symposium on Advanced Radio Technologies March 4–7, 2003,” Conference Proceedings NTIA SP-03-401, March 2003

The International Symposium on Advanced Radio Technologies (ISART) originated as a forum to explore the current state of the radio art and to identify directions in which the technology would likely evolve in the future. While the early ISART meetin...