Typically all microphones are equally weighted and the system attempts to reduce the noise field and inputs of the microphones in an average process.
Sometimes it is desirable to limit the contribution of some microphones to noise reduction of the global sound field and vice versa. This is mainly the case in situations where acoustical problems arise in a low channel EOC system used to cancel a complex and spatially extended sound fields or if the target is to only focus on the driver seat etc.
Using the “MIC WEIGHTS” tab the user can enter a specific value per microphone, per engine order and over the chosen processing frequency to control EOC feedback from mics.
The data is organized in 32 freq bins with an applied linear interpolation to increase the resolution between mic weight values in adjacent freq bins.
-120dB < Mic_wts < 0dB.
- Setting the gain to “0dB” completely disables the corresponding microphone. It has no contribution to the overall noise field reduction.
- Setting the gain to “-120 dB” enables full contribution of the feedback noise from that microphone.
Send : send data to DSP.
How to use grid and graph was described in 5.10.21.1
Make sure the number of microphones in MIC Weight is equal to m_TuneMicNum. If Vm Config is disable then m_TuneMicNum is equal to m_NumElement(# of Mic:) and if Vm Config is enable then m_TuneMicNum is equal to Num of Virtual Mics(from Additional Parameter section).
