Analog to digital converter having nonlinear amplitude transformation
Patent 4217574 Issued on August 12, 1980. Estimated Expiration Date: 
August 12, 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.
August 12, 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 References 3585631 3737894 Signal transmitting system including A-D and D-A converters Patent #: 3949170 InventorAssigneeApplicationNo. 05/712634 filed on 08/09/1976US Classes:341/140, Linearization (e.g., nonlinear transfer characteristic compensates for nonlinear transducer)341/159, Parallel type348/674Nonlinear amplitude modification (e.g., gamma)ExaminersPrimary: Miller, Carl S.Attorney, Agent or FirmInternational ClassH03M 1/00 (20060101)AbstractAn analog to digital converter simultaneously digitizes a gamma corrected analog video signal and removes the gamma correction. The converter has a plurality of parallel analog comparators which compare the video signal amplitude with the amplitude of a plurality of different reference signals, each comparator providing an output representative of the respective comparison result. Each reference signal amplitude is a different multiple of a fraction, of a common reference signal, raised to the gamma power thereby removing the gamma correction. A decoder responsive to the output of the comparators generates the digital output signal in a preselected digital code. | |
