DSP,nose,cancelling

DSP noise cancelling, is a digital signal processing (DSP) system normally used on the drivers voice transmission. The system constantly samples the car engine, wind and gearbox noises and recognises these as a repetitive background noise and then cancels these noises out using an algorithm that is tailored to this type of noise. The system adds an out of phase copy of the noises which effectively cancels them out.

As speech is a constantly varying pitch, the system ignores the drivers voice and allows just that component to be sent by the radio.

Here at Autotel we are constantly working to improve our Noise cancelling systems and are currently on our 4th generation of noise cancelling system.

The result of DSP is that it removes virtually all the noise component leaving just a clear drivers voice. This is essential in modern Digital race communications system, as any noise mixed with the drivers voice is processed by the digital radio and transmitted. Once the noise and voice are transmitted over a digital radio system, then it is impossible to to separate the 2 component with any filtering or processing. The result is a garbled voice that is very difficult to understand.

DSP is essential for a good digital radio system to work in high noise situations, and systems that do not have DSP will not work in high noise relying on Microphone noise cancelling alone.

The use of Good Noise cancelling microphones is still essential with DSP as there needs to be a higher voice level in comparison to background noise for the system to work. this make microphone and especially microphone position and installation extremely important in any Digital radio system used in motorsport.