Audio amplifier system with discrete digital frequency selective damping factor controls
AssigneePeavey Electronics Corporation
InventorJames W. Brown, Sr.
Life of this patent
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Abstract
An audio amplifier drives a load in the form of a sound producing loud speaker exhibiting a frequency variable impedance characteristic over a range of audio frequencies. Voltage and current feedback circuits respectively establish a minimum voltage feedback and a discrete feedback characteristic. A presence feedback circuit coupled to ground reduces feedback in discrete steps with increasing frequency above a selected level and a resonance feedback circuit coupled in parallel with the amplifier circuit coupled in parallel with the amplifier reduces voltage feedback in discrete steps with decreasing frequencies below a selected level. The controls are responsive to a digital interface for providing discrete settings.
Claims16
A power amplifier having a frequency selective variable damping factor, said amplifier having an input, an output and a feedback circuit coupled therebetween, the amplifier for driving a load in the feedback circuit having an impedance which varies with frequency between a high frequency cut-off and a low frequency resonance about a selected frequency comprising:
- current feedback means in the feedback circuit;
- first discrete variable impedance means in the feedback circuit to ground for varying overall feedback to the amplifier input as the frequency increases above the selected frequency;
- and
- second discrete variable impedance means in the feedback circuit between the input and the output for varying overall feedback to the amplifier input as the frequency decreases below the selected frequency, said first and second variable impedance means being independently operative with respect to each other to selectively reduce feedback delivered to the load in said feedback circuit in discrete increments in accordance with its respective impedance and said current feedback means being operative to selectively increase power delivered to the load with changing frequency above and below said selected frequency at the load resonance and the high frequency cut-off.
Dependencies are inferred from the claim text.