The signal is the value of how good and clear the audio is. A good signal would mean that there is no competing background noise therefore the audio would easy to listen to without interruptions.
Noise
A constant wave of audio that competes with audio they you are specifically trying to record, fluctuations of noise go along side an electrical signal.
Interfering Noise
These are sounds with a negative sound quality which is unpleasant to listen to. For example, when you put your phone next to your computer you hear feedback sound.
Somes location with noise issues are:
- Road side
- Busy cafe
- Building site
- Party
- Town centre at midday
Accessibility
There are different things put in place to help the accessibility of media when people have disabilities, difficulties or impediments.
Television has subtitles, audio description and sign language in the corner for some programmes to help people who have difficulties with sight and hearing.
Cinemas offer autism friendly screenings which cut adverts and show the film with a lower brightness and lower volume level. Cinemas also offer some subtitled screenings which are limited.
Radio is purely audio so there isn't a lot they can do to help with accessibility but radio presenters keep their wording as clear as simple as possible and avoid playing loud or offensive sounds.
Online videos such as YouTube have a subtile option on a lot of videos. I have looked at the subtitle settings for one of my own YouTube videos to see how it works. There is an option where YouTube makes a guess as to what the words you want to subtitle are but it isn't very reliable. I watched my video and typed the subtitles real time so that they were accurate, I then adjusted them so that they were as in sync as I could make them.
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