Search Results

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

Roger A. Dalke, Frank H. Sanders, and Brent L. Bedford, “Electromagnetic Compatibility Testing of a Dedicated Short-Range Communication System,” Technical Report NTIA TR-98-352, July 1998

Dedicated short-range communication systems have been proposed for operation at locations across the United States in the 5850 to 5925 MHz band. Various search and tracking high-power radars operate at or near this frequency band and are a source of...

Coleen T. Jones and David J. Atkinson, “Development of Opinion-Based Audiovisual Quality Models for Desktop Video-Teleconferencing,” Conference Paper, May 1998

This paper discusses the analysis of an audiovisual desktop video-teleconferencing subjective experiment conducted at the Institute for Telecommunication Sciences. Objective models of the individual audio and video quality are presented. Also discuss...

Stephen D. Voran, “A Simplified Version of the ITU Algorithm for Objective Measurement of Speech Codec Quality,” Conference Paper, May 1998

ITU-T Recommendation P.861 describes an objective speech quality assessment algorithm for speech codecs. This algorithm transforms codec input and output speech signals into a perceptual domain, compares them, and generates a noise disturbance value,...

NTIA Special Study Staff, “Radio Astronomy Spectrum Planning Options,” Special Publication NTIA SP-98-35, April 1998

J. Randy Hoffman, John J. Lemmon, and Ronald L. Ketchum, “DGPS field strength measurements at a GWEN site,” Technical Report NTIA TR-98-346, April 1998

Field strength measurements of a 300-kHz Differential Global Positioning System signal transmitted at a Ground Wave Emergency Network site at Appleton, Washington were conducted. Data were acquired continually along five different routes and tagged w...

Stephen D. Voran, “Objective Estimation of Perceived Speech Quality Using Measuring Normalizing Blocks,” Technical Report NTIA TR-98-347, April 1998

Perceived speech quality is most directly measured by subjective listening tests. These tests are often slow and expensive, and numerous attempts have been made to supplement them with objective estimators of perceived speech quality. These attempts ...

David A. Sutherland Jr., “Software Implementation of a Wideband HF Channel Transfer Function,” Technical Report NTIA TR-98-348, April 1998

This report presents an analytic model implemented as the computer program of the transfer function of a wideband HF channel model for use in a hardware simulator. The transfer function is the basic input to the hardware simulator. The mathematical b...

Stephen Wolf et al., “Validating Objective Measures of MPEG Video Quality,” Journal Article, April 1998

In 1996, the American National Standards Institute (ANSI) adopted ANSI T1.801.03, which presents a number of new objective video quality metrics for quantifying the effects of digital compression and transmission impairments. The measurements in ANSI...

Edward F. Drocella Jr., Steven K. Jones, and William T. Druhan Jr., “Spectrum Reallocation Report: Response to Title III of the Balanced Budget Act of 1997,” Special Publication NTIA SP-98-36, February 1998

On behalf of the Secretary of Commerce, the National Telecommunications and Information Administration (NTIA) has prepared this report as required by Title III S Communication and Spectrum Allocation Provisions S of the Balanced Budget Act of 1997 (...

“FY 1997 Technical Progress Report,” Technical Progress Report, January 1998

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...

Christopher L. Holloway and Edward F. Kuester, “Analysis and calculations of the ground plane inductance associated with a printed circuit board,” Technical Report NTIA TR-98-344, November 1997

A knowledge of the net inductance of the ground plane can aid in the analysis and investigation of printed circuit board emissions. In this report, we present a method, based on the concept of partial inductance, to determine the net inductance of th...

Michael Terada, “Analysis of spectrum utilization and message length statistics for the railroad land mobile radio service,” Technical Report NTIA TR-98-345, November 1997

In support of the Federal Railroad Administration of the United States Department of Transportation, the Institute for Telecommunication Sciences (ITS) has completed a field spectrum utilization survey designed to examine individual channel utilizati...

Stephen D. Voran, “Perception-Based Bit-Allocation Algorithms for Audio Coding,” Conference Paper, October 1997

We describe six algorithms for bit allocation in audio coding. Each algorithm stems from the minimization of a different perceptually–motivated objective function. Three of these objective functions are extensions of existing ones, and three are new....

David J. Atkinson and Stephen D. Voran, “Summary of Objective Audio Quality Measure Performance Data Presented to T1A1,” Technical Contribution, October 1997

This contribution aggregates the available performance data on the MNB and P.861 objective speech quality measures. Specifically, results presented in contributions T1A1.7/97-032 and T1A1.7/97-034 are examined. Based on examination of the aggregated ...

Roger A. Dalke et al., “Link Analysis for the LRPT Digital Weather Satellite System,” Technical Report NTIA TR-97-341, September 1997

The National Oceanic and Atmospheric Administration, the European Space Agency, and the European Organization for the Exploitation of Meteorological Satellites are designing a weather satellite system that will broadcast digital weather images at VHF...

Stephen Wolf, “Measuring the End-to-End Performance of Digital Video Systems,” Journal Article, September 1997

Significant research and development efforts by industry and government laboratories were brought to fruition in 1996 with the approval of American National Standard (ANSI) T1.801.03 entitled "American National Standard for Telecommunications - Digit...

Stephen D. Voran, “Estimation of Perceived Speech Quality using Measuring Normalizing Blocks,” Conference Paper, September 1997

We describe a new approach to the estimation of perceived speech quality. The approach uses a simple, but effective, perceptual transformation to emulate hearing and a hierarchy of Measuring Normalizing Blocks (MNB's) to emulate auditory judgment. Th...

Stephen D. Voran, “Listener Ratings of Speech Passbands,” Conference Paper, September 1997

We describe a listening experiment that measures the perceived speech quality of 19 speech passbands using 8 talkers and 28 listeners. Results are referenced to the traditional wide-band and narrow-band telephony passbands. Our findings may help thos...

Roger A. Dalke, Yeh Lo, Peter B. Papazian, and George A. Hufford, “Measurement and Analysis of Man-made Noise in VHF and UHF Bands,” Conference Paper, August 1997

Recently, The Institute for Telecommunication Sciences measured man-made noise in portions of the VHF and UHF bands. This paper provides an overview of the measurement and analysis methods used and examples of the results. The VHF measurements were m...

Robert L. Sole, Frank H. Sanders, and Brent L. Bedford, “Assessment of Compatibility between 25 and 12.5 kHz Channelized Marine VHF radios,” Technical Report NTIA TR-97-343, August 1997

The maritime mobile frequency band supports maritime communications worldwide. Appendix 18 of the ITU Radio Regulations (RR) defines the channels of the maritime mobile service. These channels support a variety of communication functions including: ...