Phoenix Hearing Instruments

Bridging the gap between technology and need...
Registered NDIS Provider #4050013440
Even using the latest technology surround sound system, hearing aid users are subjected to propagation delays and distortion. The sound from each channel arrives at their hearing aid microphone and the hearing aid amplifier reacts poorly to differences in the timing and amplitude.

Figure 1: Normal (unprocessed Audio Signal)
Plenty of difference between soft and loud - Normal Dynamic Range

Figure 2: Audio after compansion/re-emphasis
Reduced difference between soft and loud - Reduced Dynamic Range

Figure 3: Result after additional processing by a hearing aid
Further reduction in the difference between soft and loud combined with significant loss of information

Figure 4: The missing information!

Figure 1 shows the normal audio waveform before any signal processing during production is introduced.
Figure 2 shows the changes made during production with softer sounds made louder
(this is what we normally hear from the TV).
Figure 3 shows the changes made by the hearing aid as it compresses the artificially loud signal and reduces the dynamic range even further.
Figure 4 shows the vital information that has been removed from the original sound.

What is missing?

© Phoenix Hearing Instruments Pty Ltd 2018
Registered NDIS Provider #4050013440
Last update 27 August 2021
ABN: 49 087 517 262