Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1991-07-01
1994-01-04
Heyman, John S.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
358166, 358 36, 307264, H04B 110
Patent
active
052764036
ABSTRACT:
A nonlinear preemphasis-deemphasis system of simplified circuit configuration formed of nonlinear preemphasis and deemphasis circuits. The preemphasis circuit comprises a nonlinear signal increase circuit for increasing the amplitude of an input signal component whose frequency is higher than a predetermined frequency in accordance with the frequency of that signal component, until the signal component reaches a predetermined threshold level. The output of the signal increase circuit is added to the input signal, and the summed signal is supplied to a nonlinear signal decrease circuit having an operating characteristic inverse to that of the nonlinear signal increase circuit. Another adder adds the output of the signal decrease circuit to the input signal. The nonlinear deemphasis circuit is connected to the nonlinear preemphasis circuit via a signal transfer device and comprises a second nonlinear signal decrease circuit having an operating characteristic inverse to that of the nonlinear signal increase circuit for decreasing the amplitude of a received signal component whose frequency is higher than the predetermined frequency, the amplitude decrease being a function of the frequency of the received signal component, until the received signal component reaches a predetermined threshold level. A subtracter subtracts the output of the signal decrease circuit from the received signal.
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Frommer William S.
Heyman John S.
Riley Shawn
Sinderbrand Alvin
Sony Corporation
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