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1. 发明授权

US3624638A Signal-converting method and apparatus 失效
标题翻译：信号转换方法和装置
公开(公告)号：US3624638A
公开(公告)日：1971-11-30
申请号：US3624638D
申请日：1970-09-23
申请人： ORION RESEARCH
发明人： RISEMAN JOHN H , GOLDBERG HAROLD S , GRIMES JOHN
IPC分类号： H03M1/00 , H03K13/02
CPC分类号： H03M1/56
摘要： A method and apparatus for converting an input analog signal to an antilog output signal which comprises the generation of a linear ramp signal which increases toward a predetermined response level. A clock signal having a predetermined cycle is provided so that when coincidence is detected between the ramp signal and the input signal, an exponential signal asymptotically approaching a predetermined amplitude with a time constant of predetermined value is then generated until the clock signal reaches the end of its predetermined cycle. At that time, a second linear ramp signal having an instantaneous absolute value of slope determined in accordance with the absolute value of slope of the first ramp signal and an initial absolute value determined in accordance with the absolute amplitude value of the exponential signal at the end of the predetermined cycle is generated. The antilog output signal is proportional to the time period measured from the end of the predetermined cycle until coincidence occurs between the second ramp signal and a reference signal which has a predetermined relationship to the input analog signal.

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