Adaptive linearizing acoustic coupling system
Patent 4100373 Issued on July 11, 1978. Estimated Expiration Date: 
September 28, 1997. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
September 28, 1997. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References3808369 InventorAssigneeApplicationNo. 05/837572 filed on 09/28/1977US Classes:379/93.37Having acoustic linkExaminersPrimary: Stellar, George G.Attorney, Agent or FirmInternational ClassH04L 27/10 (20060101)AbstractNon-linearities imparted by an acoustic coupling instrument for interfacing data signals from a modem to a telephone line are compensated. Both the output of the modem and that of the non-linearity introducing instrument are monitored. The two output signals therefrom are compared and an error signal representative of the degree of non-linearity of the line signal is generated, and this error signal is then appropriately scaled and stored in a memory as a correction signal. Stored correction signals are read out of the memory in response to address signals defined by the characteristics of the signals from the modem, and are added to the modem output signals before they are imparted to the non-linear coupling instrument. The added correction signals effectively compensate for the non-linearity of the acoustic coupler, thereby removing the unwanted distortion from the telephone line signal. The contents of the memory are dynamically adjusted so that the system effectively adapts itself to the non-linearity of the instrument.Other References
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