Sound and Accessibility

SIGNAL

• Good - Perfect audio
• Bad - Noise/interference, corrupted audio, inaudible 
• 
  
• Radiowaves - what you can hear
• When Signal is weak, noise is louder 

NOISE

• Fuzz, background, buzz, constant
• Fans, Air-Con, computer, Kitchen, T.V, People

INTERFERENCE

• Inconsistent, unwanted

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Locations where noise may be an issue: 

• Roadside/Urban area/Shopping centre/cafe
• Windy area such as beach/hill/mountain
• Building site
• Electric Generator

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TV: Subtitles, audio description, Audio loop - a magnetic signal sent to the hearing aid. 

Cinema: Hearing loop

Radio:

Online: Subtitles

PPM dB
0 -10
1 -12
2 -14
3 -16
4 -18
5 -20
6 -22

PPM = -2(dB-5