Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1982-11-03
1985-03-12
Chin, Tommy P.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
358 17, 307527, H04N 944
Patent
active
045048622
ABSTRACT:
To generate a binary signal on the occurrence of a given frequency ratio of two signals, the higher-frequency, first signal is applied to the count input of a first up-counter whose maximum count is greater than the frequency ratio. The attainment of a count of the first up-counter in an upper range of successive counts which includes the frequency-ratio count and the maximum count is monitored by a decoder having an output for all range counts, an output for a count lying a few counts before the frequency-ratio count, and an output for the frequency-ratio count. The first of these outputs is coupled to the control input of an electronic make contact; the second output is coupled to the trigger input of a monostable multivibrator, and the third output is connected to one of the two signal inputs of an electronic switch having its other signal input connected to the output of the make contact. The output of the multivibrator is connected to the up-down control input of an up-down counter having a lower count output and an upper count output coupled, respectively, to the R input and the S input of an RS flip-flop whose Q output is connected to the control input of the switch. The start-reset input of a second up-counter, whose maximum count is locked up, is connected to the Q output of the flip-flop, while the output of the switch is coupled to the reset input of the first up-counter. The second signal is applied to the signal input of the make contact and to the count inputs of the second up-counter and the up-down counter. The binary signal appears at the maximum-count output of the second up-counter.
REFERENCES:
patent: 4454531 (1984-06-01), Elmis
Chin Tommy P.
IT&T Industries, Inc.
Lenkszus Donald J.
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