Dynamic information storage or retrieval – Specific detail of information handling portion of system – Mechanical modification or sensing of storage medium
Patent
1985-12-10
1986-11-11
McElheny, Jr., Donald
Dynamic information storage or retrieval
Specific detail of information handling portion of system
Mechanical modification or sensing of storage medium
328165, 369 53, 369174, 381 94, G11B 300
Patent
active
046226605
ABSTRACT:
A method for correcting higher order distortion introduced in a complex multifrequency waveform by an element which introduces signal-induced nonlinearities uses a replica of the non-linear element as a part of a high gain electronic feedback circuit between the output and an input of an amplifier. The replica of the non-linear element receives the multifrequency waveform, and is driven to duplicate the non-linear effects, which are used to generate a compensating voltage which is compared to the voltage obtained from the non-linear device. The resultant difference voltage after the comparison and amplification is then closer to the original signal. Thus, in an audio system for example, distortions which are audibly apparent to the human ear but so small they are immeasurable by instrumentation can be eliminated or minimized by employing a number of replicas in the same fashion. In corollary fashion a signal that is to be processed by circuits containing non-linear elements or devices can be precompensated prior to processing.
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Ahmed M. Soliman et al, "Active Compensation of Opamps", IEEE Trans. on Circuits and Systems, vol. CAS-26, No. 2, (Feb. 1979), pp. 112-117.
Bennett M. Owen
Cowans Kenneth W.
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