Signal characteristic state detector using interval-count processing method
First Claim
1. In a system for receiving binary coded data signals having at least one predetermined characteristic, as well as having at least one signal level transition per symbol in a direction that is indicative of the binary information state of the symbol, the method for detecting the state of said predetermined characteristic of such data signals CHARACTERIZED BY the steps ofgenerating (10) binary coded words representing, respectively, for recurring symbol subintervals of predetermined length, the approximate proportion of each subinterval that the information signal state is in one of the binary signal states, andprocessing (11) said words to detect the state of said characteristic in said signals.
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Abstract
Received baseband data signals, in the form of signals having at least one level transition per symbol indicative of symbol information state, are sampled (17) at a rate much higher than the symbol rate. The samples are used to control the direction of counting (20) of local clock (12) signals recurring at that higher rate during symbol subintervals of predetermined duration. Counts produced during adjacent subintervals are processed (FIGS. 4 and 5) to produce several different results such as recognition of the start of an asynchronously occurring data message, acquisition and tracking of symbol phase in the message, and detection of symbol information states.
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19 Claims
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1. In a system for receiving binary coded data signals having at least one predetermined characteristic, as well as having at least one signal level transition per symbol in a direction that is indicative of the binary information state of the symbol, the method for detecting the state of said predetermined characteristic of such data signals CHARACTERIZED BY the steps of
generating (10) binary coded words representing, respectively, for recurring symbol subintervals of predetermined length, the approximate proportion of each subinterval that the information signal state is in one of the binary signal states, and processing (11) said words to detect the state of said characteristic in said signals.
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16. In a system for receiving binary coded data signals having at least one predetermined characteristic as well as having at least one signal level transition per symbol in a direction that is indicative of the binary information state of the symbol, a circuit for detecting said characteristic and being CHARACTERIZED IN THAT it includes
means for generating (10) binary coded words representing, respectively, for recurring symbol subintervals of predetermined length, the approximate proportion of each interval that the information signal state is in one of the binary signal states, and means for processing (11) successive ones of said words for detecting said data signal characteristic.
Specification