Search Results

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

Institute for Telecommunication Sciences, “FY 2009 Technical Progress Report,” Technical Progress Report, May 2010

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...

Stephen D. Voran, “Subjective Ratings of Instantaneous and Gradual Transitions from Narrowband to Wideband Active Speech,” Conference Paper, March 2010

In advanced heterogeneous telecommunication networks, network resources can dynamically dictate the type of speech coding that is used. An increase in resources allows for lower coding distortion or it might also be used to provide wideband speech in...

Margaret H. Pinson, Stephen Wolf, and Gregory W. Cermak, “HDTV Subjective Quality of H.264 vs. MPEG-2, With and Without Packet Loss,” Journal Article, March 2010

The intent of H.264 (MPEG-4 Part 10) was to achieve equivalent quality to previous standards (e.g., MPEG-2) at no more than half the bit-rate. H.264 is commonly felt to have achieved this objective. This document presents results of an HDTV subjectiv...

Marcus Barkowsky, Margaret H. Pinson, Romuald Pépion, and Patrick Le Callet, “Analysis of Freely Available Subjective Dataset for HDTV including Coding and Transmission Distortions,” Conference Paper, January 2010

We present the design, preparation, and analysis of a subjective experiment on typical HDTV sequences and scenarios. This experiment follows the guidelines of ITU and VQEG in order to obtain reproducible results. The careful selection of content and ...

Margaret H. Pinson, Stephen Wolf, Neha Tripathi, and Chin Koh, “The Consumer Digital Video Library,” Conference Paper, January 2010

The shortage of high quality video sequences has hampered video quality research for 20 years. Every Video Quality Experts Group (VQEG) test has encountered difficulty in obtaining quality source content. For some validation tests, this caused a mult...

Edward F. Drocella Jr. and David S. Anderson, “Correction Factors and Measurement Procedure To Assess the Interference Impact of Linear Swept Frequency Signals on Radio Receivers,” Technical Memorandum NTIA TM-10-464 [dc], December 2009

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 t...

Carolyn Ford et al., “Multimedia Synchronization Study,” Technical Memorandum NTIA TM-10-464, November 2009

ITS is conducting a series of studies to quantify the effects of the separate audio and video compression qualities, and the differential delay in their synchronization, to the perceived aesthetic quality of a multimedia signal. The experiment descri...

Andrew A. Catellier and Stephen D. Voran, “Low Rate Speech Coding and Random Bit Errors: A Subjective Speech Quality Matching Experiment,” Technical Report NTIA TR-10-462, October 2009

When bit errors are introduced between a speech encoder and a speech decoder, the quality of the received speech is reduced. The specific relationship between speech quality and bit error rate (BER) can be different for each speech coding and channel...

Stephen Wolf, “A Full Reference (FR) Method Using Causality Processing for Estimating Variable Video Delays,” Technical Memorandum NTIA TM-10-463, October 2009

Digital video transmission systems consisting of a video encoder, a digital transmission method (e.g., Internet Protocol – IP), and a video decoder can produce pauses in the video presentation, after which the video may continue with or without skip...

Frank H. Sanders, Robert T. Johnk, Mark A. McFarland, and J. Randy Hoffman, “Emission Measurement Results for a Cellular and PCS Signal-Jamming Transmitter,” Technical Report NTIA TR-10-465, October 2009

This report describes emission measurements on a denial-of-service (jammer) transmitter operating in the 800 MHz and 1900 MHz cellular and PCS bands. The jammer operates at a power level of up to 100 watts in each band, repetitively sweeping a carri...

Robert T. Johnk et al., “A Mobile Propagation Measurement System,” Conference Paper, August 2009

This paper describes a mobile-to-mobile propagation measurement system that is currently being developed at the Institute for Telecommunication Sciences under the sponsorship of the Office of Spectrum Measurement. This system uses a fixed transmitte...

Stephen D. Voran and Andrew A. Catellier, “Gradient Ascent Paired-Comparison Subjective Quality Testing,” Conference Paper, July 2009

(This paper won the QoMEX 2009 Best Paper Award.) Subjective testing is the most direct means of assessing audio, video, and multimedia quality as experienced by users and maximizing the information gathered while minimizing the number of trials ...

Edward F. Drocella Jr., Larry Brunson, and Charles T. Glass, “Description of a Model To Compute the Aggregate Interference from Radio Local Area Networks Employing Dynamic Frequency Selection to Radars Operating in the 5 GHz Frequency Range,” Technical Memorandum NTIA TM-09-461, May 2009

In 1997, the Federal Communications Commission (FCC) authorized the use of Unlicensed National Information Infrastructure (U-NII) devices in the 5150–5250 MHz, 5250–5350 MHz, and 5725–5825 MHz bands. The technical and operational requirements are dif...

Kjell Brunnström, David Hands, Filippo Speranza, and Arthur A. Webster, “VQEG Validation and ITU Standardization of Objective Perceptual Video Quality Metrics [Standards in a Nutshell],” Journal Article, May 2009

For industry, the need to access accurate and reliable objective video metrics has become more pressing with the advent of new video applications and services such as mobile broadcasting, Internet video, and Internet Protocol television (IPTV). Indus...

Stephen Wolf and Margaret H. Pinson, “Reference Algorithm for Computing Peak Signal to Noise Ratio (PSNR) of a Video Sequence with a Constant Delay,” Technical Contribution, February 2009

Peak Signal to Noise Ratio (PSNR) has been used as a benchmark to evaluate new objective perceptual video quality metrics. For example, PSNR has been used as a benchmark for both the Multimedia (MM) and Reduced Reference Television (RRTV) test progra...

Stephen Wolf and Margaret H. Pinson, “Fast Low Bandwidth Video Quality Model (VQM) Description and Reference Code,” Technical Contribution, February 2009

Study Group 9 has been working on finalizing Draft New Recommendation J.redref which specifies Reduced Reference (RR) methods for performing video quality measurements of digital television systems. The U.S. National Telecommunications and Informatio...

Stephen Wolf, “A No Reference (NR) and Reduced Reference (RR) Metric for Detecting Dropped Video Frames,” Conference Paper, January 2009

Digital video transmission systems consisting of a video encoder, a digital transmission method (e.g., Internet Protocol – IP), and a video decoder can produce pauses in the video presentation that result from dropped or repeated video frames. For ex...

Margaret H. Pinson and Stephen Wolf, “In-Service Video Quality Metric (IVQM) User’s Manual,” Handbook NTIA HB-09-434b, January 2009

This handbook provides a user’s manual for the batch video quality metric (BVQM) tool. BVQM runs under the Windows XP® or Red Hat Linux® operating systems. BVQM performs objective automated quality assessments of processed video clip batches (i.e., ...

Margaret H. Pinson and Stephen Wolf, “Batch Video Quality Metric (BVQM) User’s Manual,” Handbook NTIA HB-09-441c, January 2009

This handbook provides a user’s manual for the batch video quality metric (BVQM) tool. BVQM runs under the Windows XP® or Vista® operating systems. BVQM performs objective automated quality assessments of processed video clip batches (i.e., as output...

“FY 2008 Technical Progress Report,” Technical Progress Report, January 2009

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...