Automatically tune in and number channels and inform users of changes
Manual tuning is unnecessary for most users and can easily be done automatically. If each channel can be assigned a permanent number, in a favourites list for example, users with vision impairments who cannot use the on-screen programme guide will be able to navigate by remembering channel numbers. However, if the numbers change without warning, those users may have difficulty locating the required channel and may not immediately realise that they are watching a different channel.
Directions and techniques
Run an automatic tuning sequence on initial set-up (high priority)
The equipment should automatically carry out a full channel search and tuning when first powered up and connected to a display and a network.
Automatically identify new services (high priority)
New services should be identified and tuned in when they are launched.
Assign numbers to channels and inform users when the addition or removal of channels causes channel numbers to change (high priority)
Channels should be numbered and should, as far as possible, retain their numbering over time. If numbers have to be changed, due to the addition of new channels for example, users should be informed. This can be done using a visible and audible warning message when the user first goes to a channel number after it has been reassigned.
An on-screen programme guide that allows users to assign their own shortcut numbers to channels, in a favourites list for example, can avoid the problem of changing numbers, but users should still be informed of new channels.
Display tuning progress in a way that is accessible to people with sensory impairments
During the automatic tuning sequence, if the display shows the current status, such as the percentage of time remaining, this information should be presented in both visual and audible forms so that it is accessible to people with hearing loss or sight loss. If the equipment has spoken output, this can be used to speak displayed text messages or percentages. Otherwise, beeps or other sounds can be used in a way to indicate that progress is being made or that the sequence has completed. Any information about how to skip or exit the tuning sequence should also be available in both visual and audible forms.