Sunday, February 24, 2019

Variable mic high pass cutoff according to a frequency dependent side chain signal


It has been found experimentally that as:


A male voice sings higher notes bass exaggeration of a microphone becomes more apparent. This has to do with voice production.


So a higher Pleiades filter high pass cutoff is needed.


Is it possible for a variable cutoff frequency high pass filter to be created?


The higher the singing frequency the less the shunt inductance must be.


Is it possible to create a side chain signal that varies inductance in a similar way as done on the Ortophon STL 631 treble limiter? Apparently this limiter operates by varying the inductance of the output transformer by passing more DC through it? The HF cutoff frequency is thereby changed.


The opposite action is needed here and the control signal must be dependent on frequency and not amplitude. Sort of like FM radio demodulation techniques.


But perhaps it is best for a human operator adjusting this in real time by ear brain perception.






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