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| Accessibility services in digital TV |
Methods | Monitoring process | Manual evaluation to guarantee quality (parameters) |
| Step 1: capture and store | Step 2: analysis process |
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| | (i) EPG information | (i) Subtitle presence/absence | (i) Correct name in the event-name field of the EPG |
| (ii) DTT channel composition | (ii) Audio description presence/absence | (ii) EPG updated in sync to actual programme changes |
| (iii) Detecting subtitling for each programming event in the EPG. | (iii) Total subtitling time including spots | (iii) Existence and consistency of subtitle signalling |
| Subtitles | Automated and manual methods | (iv) Subtitles themselves | (iv) Coherence between EPG and actual subtitles | (iv) Existence of Teletext subtitles |
| | (a) Teletext: presentation time, speed, colour information, and position on the screen | (v) Subtitle colors | (v) Existence of DVB subtitles |
| | (b) DVB: the rendered images and time codes, speed, along with the position information on the screen | (vi) Subtitle speed | (vi) Interference of subtitles with other informative captions |
| (vii) Character per line in the subtitles | (vii) Subtitle position on the screen |
| (viii) Historic EPG | (viii) Number of subtitle lines in prerecorded programmes |
| (ix) Number of subtitle lines in live programmes |
| (x) Usage of colours in subtitles (follow checklist of Table 1) |
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| | (i) Detecting audio descriptions for each programming event described in the EPG | (i) Audio description presence/absence | (i) Used language |
| Audio description | Semiautomatic and manual method | (ii) Extracting the audio description themselves according to DVB standards | | (ii) Quality of intonation and interpretation |
| | (*) Some exception of the audio streams that can contain an audio description or not | (*) Some exception of the audio streams that can contain an audio description or not | (iii) Sound mixing quality |
| (iv) How user needs are met |
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