KTM bikes could get volume-meter to tackle noise restrictions

- Leaked patent shows KTM’s noise monitoring concept

- Suggests using a microphone, sensors and a noise map

- Noise levels to be displayed on the instrument cluster

As restrictions on motorcycle-led noise are getting more stringent by the day globally, KTM is working on a system which will allow riders to monitor the decibel levels of their exhaust sound on the go. The patent application of the system has leaked online, giving away the basic working principle of it.

Stock bikes with company-fitted exhaust are supposed to be emitting noise under permitted decibel levels. However, those noise level tests are conducted under specific conditions with a certain positioning of microphones and with varying speed, acceleration, and engaged gear. Hence, when tested by the authorities out in the real world, it’s possible that even completely stock motorcycles fail to comply with the regulations. The system which KTM is working on will let the riders be aware of their bike’s noise levels in real time through a notification on the dashboard. The concept is similar to having a speedometer on the motorcycle which continuously keeps the rider aware of their speed, thereby helping them be within the maximum permitted speeds on public roads.

As per the leaked patent, the system will essentially be using a microphone or sensor or a combination of both, placed between the engine and the exhaust, calibrated to send signal indicating the intensity of noise being emitted. The patent also comprises an alternate solution involving a noise map based on the throttle position, speeds, revs, and load which will deliver the same output without having to include sensors. The gathered data through this system will be sent to the rider in the form of either changing levels on an onboard digital volume meter or an analogue decibel meter with a rotating needle. KTM is also considering including a ‘stealth mode’ in its bikes which, when activated, will not let the exhaust and engine emit noise levels over a preset extent.

Now, it remains to be seen when the aforementioned system will make it to production on KTM motorcycles and whether other manufacturers will follow suit.