Antonelli, Terry, Stout & Kraus
Method of converting analog signals into digital signals and system for carrying out the method
 The same analog signal is inputted to an 8-bit AD converter and to a 4-bit AD converter to obtain an 8-bit digital data and a 4-bit digital data for the same sample value of the analog signal. Values of the 8-bit digital data and 4-bit digital data are compared with each other. The 8-bit digital data is outputted as a digital signal for the sample value of the analog signal when a difference between these values is not greater than one-half the quantity that corresponds to the least significant bit of the 4-bit digital data, and the 4-bit digital data is outputted as a digital signal for the sample value of the analog signal in other cases. There is realized AD conversion which operates apparently at high speeds maintaining high accuracy. 
Hitachi, Ltd. Hitachi Electronics, Ltd.
H
H03M
inventional
Masao Kenji Shigeru
Hotta Maio Watanabe