1. What is Roger?

2. Do we still need FM Background noise Reverberation Distance
©Phonak Presentation Template – Marketing
17/11/201817/11/2018
Three major factors degrade the Signal-to-Noise Ratio (SNR) and therefore the quality of the speech signal
Background noise
Reverberation
Distance

3. Received
Orders
Given
Expecting
Results

4. What is frequency
This is the number of cycles that signal completes per second
Kilo Hertz per second
Mega Hertz per second
Giga Hertz per second
Tera Hertz per second
It is no relevance to the quality of a signal
An analogy could be: does a bigger road improve your car!

5. Why do we use digital
This does not equate necessarily to quality
Noise can be digitised accurately and sent digitally to an end user this will not help understanding
All a digital signal is, is a transmission medium and a protocol
Bad signal in will not be magically transformed into a good signal out
Remember also that sound is analogue and the process of changing this to a digital signal can in itself cause errors
It is not because it is digital, it is how it is digitised!

6. How do we overcome this We have Intelligent frequency hopping
This means that the Roger system actively looks for clean space to broadcast in.
Also remember the signal is sent 3 times and the receiver are monitoring that the signal has been received correctly

7. Digital VS FM They are designed to overcome the same challenges
Digital and 2.4GHz is not in itself a “Magic solution”
It is reliant on:
Mic Directionality
The quality of the digitisation process
The decoding at the receiver
The noise in the environment
How well the signal is captured at the receiver
Etc Etc Etc………

8. A true Digital system
Think of digital cameras compare an iPhone with the latest Nikon. They are both digital cameras but what do professionals use to photograph the Grand Prix?