EN IEC 62731:2018 pdf free.Text-to-speech for television – General requirements.
This document describes the required basic behaviour for a TV text-to-speech combination ina basic profile, but also provides for enhanced profiles. lt also gives a short introduction intothe basic problems of visually impaired people: i.e. what are the problems visually impairedpeople experience when using and watching Tv?
Providing text-to-speech functionality for a broadcast receiver, for example a TV or an STB,can be of great help to (visually) disabled people. Such speech functionality may beintegrated in the receiver or may be external to the receiver in a separate device.
ln general as the guiding principle,when building a TTS interface in the context of thisdocument,implementers should aspire to achieve functional equivalence of the userexperience.This means that a person operating the device using the speech interface shouldhave access to similar information and be able to accomplish tasks similar to those theywould with a graphical UI.
The main features of this document are:
basic functional description for a TV-TTS device combination or TV with integrated TTS;
profiles for different levels of TV-TTS functionality;
targeted towards the digital TV application.
In this document,mandatory requirements are specified; optional and informative features arealso included.
A claim of conformity with this document requires conformity with all mandatory requirements.A TV-TTS device combination or a TV with a TTS that is integrated may provide options for auser to enable or disable each feature of a product.While options for user configurations maybe provided, the product shall meet the mandatory requirements.
The problem is that a user is unable to select the required input to the TV, e.g. the userwishes to select DTV or a specific external input linked to a recording or other device. Thechoice is shown on the screen but the user is unable to see it.
With digital TV, a broadcaster may transmit additional data (text) services to augment TVprogramming,provide additional information on programming,or provide news. Suchadditional data are:
information about whether audio description, subtitling is available,(next)(DTV broadcast) event name,
(DVB-) event information (enhanced description of the (DTV broadcast) event),.EPG data.
The items above are listed in order of importance with the most important item appearing first.lt is noted that this data provides additional convenience in using the TV, but that is non-essential for the primary function of watching TV,and selecting channels.
User settings are another needed function besides navigation. This can be done throughbuttons on the remote control (out of scope of this specification), but also via on-screenmenus.For visually impaired people,on-screen menus are typically of little use.
A distinction exists between initial setup and daily operation of the TV. Initial setup is typicallya one-time operation during the lifetime of a TV.Daily operation is more frequent and moreimportant. Consequently, a distinction among menu items for daily operation exists,thoseaddressing specific accessibility functions, and TV setup menu items. However,the mostfrequently used keys are “volume”, “channel up/down”, and number keys.EN IEC 62731 pdf download.