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| High-frequency noise, in
particular, is a cause of annoyance and of high warranty
costs for car manufacturers. Therefore, the elimination
of brake squeals are of increasing importance in the development
of new brake systems. |
| As disturbing brake noise
usually only appears on a irregular basis, a detection
system needs to dispose of intelligent algorithms for
noise detection which initiate a signal recording only
for real brake noise though take all audible squeals into
consideration. |
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BrakeObserver
Hardware consists of front end, industry PC and mini VGA
monitor with touchscreen. Click here
to enlarge |
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| With BrakeObserver
HEAD acoustics GmbH developed a mobile measurement system consisting
of hardware and software for recording, detection and subjective
evaluation of brake noise which is capable to distinguish disturbing
brake noise from normal operation noise. |
| The BrakeObserver
software is based on the principle of pattern recognition of
human hearing (patented Relative Approach Algorithm). It reacts
to quickly changing temporal and spectral structures of signals,
which change quickly |
| The interface of the software
is freely customizable and, visualization included, can be set
quickly and reliably to the driver's different requirements.
The various trigger options also feature the power of performance
and adaptation during use. Besides the automatic brake noise
detection including "off-brake noise", the sound recording can
also be triggered manually or through other signals, such as
brake pressure or brake pedal position. |
| Besides the eight audio channels
the front end provides inputs for sensors, e.g. for recording
brake and environment temperature, brake pressure, humidity,
vehicle acceleration and RPM. In addition, CAN signals can be
fed into the measurement system. |
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News, Events & Publications 
BrakeObserver
24.07.07 
