Frequency dependent dynamic range control

A signal emitting system, comprising:

• a signal emitter, characterized by an admittance that increases with signal frequency, configured to emit an output signal based upon an amplified signal;
• an amplifier coupled to the signal emitter, the amplifier configured to:
• receive a dynamically conditioned source signal;
• generate the amplified signal based upon the dynamically conditioned source signal;
• and
• transmit the amplified signal to the signal emitter;
• and
• a processor coupled to the amplifier and configured to receive a source signal and to generate the dynamically conditioned source signal to the amplifier, the processor comprising:
• a frequency transform block configured to transform the source signal to a reconstructable frequency domain representation, wherein the reconstructable frequency domain representation comprises a plurality of frequency bins;
• a spectrum-to-voltage transfer function block configured to convert the reconstructable frequency domain representation to a voltage representation;
• an admittance characteristic block configured to convert the voltage representation to a current spectrum;
• a parameter extraction block configured to determine a breakdown frequency bin index and a roll-off factor, wherein the breakdown frequency bin index is the highest frequency bin index where a cumulated current does not exceed a current limit, and the roll-off factor is used to exponentially attenuate the reconstructable frequency domain representation, wherein the roll-off factor is a dynamically determined number ranging from 0 to 1, iteratively determined such that an overall current is under the current limit;
• a dynamic conditioning filter block configured to:
• construct a conditioning gain vector for the plurality of frequency bins, wherein the conditioning gain vector comprises a flat-band portion of unity gain and a roll-off portion of decaying gain, wherein the flat-band portion comprises frequency bins having bin indices below a flat-band bin index based on the breakdown frequency bin index, and the roll-off portion comprises frequency bins with bin indices above the flat-band bin index;
• and
• apply the conditioning gain vector to the reconstructable frequency domain representation to produce a conditioned frequency domain representation;
• an inverse transform block configured to inversely transform the conditioned frequency domain representation to an intermediate time-domain signal;
• and
• a post-processing block configured to apply gradient control to the intermediate time-domain signal to limit differences between consecutive samples of the intermediate time-domain signal to produce the dynamically conditioned source signal, and send the dynamically conditioned source signal to the amplifier.