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IS Findings are documents developed by the ATSC Implementation Subcommittee on various aspects of the digital television transition. They provide practical guidance on station operation and design. IS Findings may also identify aspects of the DTV transition requiring additional study, including development of standards, recommended practices, and/or information documents. |
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30 October 1998, Download PDF File
In an effort to speed the transition to digital television broadcasting, the Implementation Subcommittee of the ATSC undertook an effort to inventory the various systems and their interfaces that could potentially exist in a typical station, regardless of the chosen implementation scenario. This inventory was intended to serve as a guide of sorts to point to the standards that exist for equipment interfaces, identify potential conflicts between those standards, and identify areas where standards and/or technology need further development. |
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18 November 1999, Download PDF File
This document contains a series of recommendations developed by the ATSC Implementation Subcommittee's Data Implementation Working Group (DIWG) for the implementation of data services in an ATSC emission station. It covers interconnections between the components of a DTV data broadcast, management and provisioning parameters common to data broadcast equipment, flow control for opportunistic data broadcast and data synchronization. |
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6 January 2000, Download PDF File
This document discusses MPEG-2 time stamping of AC-3 bit streams considering the complication and potential ambiguity caused the overlap add process employed within the AC-3 filterbank. The behavior of the software AC-3 encoders and decoders, which are often used to create and analyze test bit streams, is also described. This note presumes a 48 kHz sample rate when discussing time periods of blocks and frames. |
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25 October 2001, Download PDF File
There is a need for certain information related to digital television programs to be stored and transported within and between television facilities. The ATSC Implementation Subcommittee considers this information to be essential for the proper operation of both professional and consumer digital television equipment. Most of this associated information is metadata about the program stream elements, however, some of it is related data essence. Although the storage and/or transport of program streams may take many forms—i.e., videotape, data tape, servers, radio frequency transmissions, or terrestrial circuits—there is a common need to preserve and transmit this information. |
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26 June 2003, Download PDF File
These findings address end-to-end DTV system latency, specifically unequal delays that can be imposed on the audio and video signals. Specific guidelines are given for four identified elements of the program chain from origination to the consumer. |
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28 July 2001, Download PDF File
Current practice in the identification of programs during the production and distribution processes, including program interchange between organizations, involves human-readable labels and, sometimes, machine-readable labels attached to physical media, with no widely accepted standards for such labeling. Any identification information embedded within the content consists of opening slates recorded in the video that must be read by humans. Programs are often accompanied by format sheets that provide the timing of segments within the programs, but the timings so provided are often suspect and require verification if tight control of program integration is to be maintained.
To achieve the greatest benefit to the industry in terms both of accuracy of program release and integration, and of labor savings through use of automation, it is necessary to establish standard methods for carrying the required information together with program content. A number of essential underlying techniques that will enable meeting of the requirements have been developed over the last few years. Now it is necessary to examine the overall system so as to develop a complete set of requirements and then to standardize the necessary solutions to those needs. |
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17 May 2002, Download PDF File
This document lists currently used input and output interfaces for encoders and multiplexers. |
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13 June 2002, Download PDF File
Programs starting and finishing at unpredictable times can cause great inconvenience to viewers, particularly if they are trying to view or record successive programs on different stations. This is a serious problem, which to avoid upsetting the viewing public, broadcasters will have to address in the near term. |
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25 September 2002, Download PDF File
These findings result from an investigation carried out by ATSC Implementation Subcommittee PSIP Working Group during the period February – September 2002, and were adopted by the IS on 24 September 2002. They reference an informative document from the ATSC IS PSIP Working Group, Assessment of Data Content and Delivery for Control of the Digital Broadcast Transport Stream and PSIP Generation, dated 24 September 2002. |
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9 June 2004, Download PDF File
These findings address the need for further work by the ATSC, CEA, and SMPTE to review and further analyze considerations and issues relating to image formatting with the goal of producing one or more recommended practices for use by broadcasters and professional and consumer equipment manufacturers regarding optimization of image formatting for transmission and in receivers and video displays. |
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10 September 2004, Download PDF File
The successful delivery of high-quality multichannel audio begins with a descriptive and accurate program delivery specification. As has been the case since the days of monophonic audio, it is imperative that broadcasters require that audio be delivered in a standard and consistent manner. These basic requirements still hold true for multichannel audio, and expand to encompass proper audio metadata. An introduction to audio metadata is presented in this document, giving a list of all of the parameters, then a detailed treatment of the three most important parameters: Dialogue Level, Dynamic Range Control, and Downmixing. Finally, six typical program scenarios are presented. |
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ATSC documents are available in the Adobe Acrobat (PDF) format. If you do not have Adobe Acrobat Reader, you may download a free reader from Adobe. Note that newer documents have been produced using Acrobat Version 7.0. This version, by default, writes files that can not be read by Readers before 6.0. It may be necessary, therefore, to download the latest version of Acrobat Reader.
Please note that some of these documents contain Normative References from Organizations that meet the criteria stated in the ATSC Policy on Copyright and References. |
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