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US 3,938,050 AGranted
Non-linear correction of waveforms
AssigneeThe Post Office
InventorsJohn McCreath Corbett, Josef Maria Linke
Life of this patent
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Abstract
This disclosure relates to the non-linear correction of electrical signals in waveform transmission and recording systems such as television systems, visual telephone systems, facsimile transmission systems and sound recording systems.
Claims14
A waveform correction circuit comprising:
- an input terminal for receipt of a signal to be
- corrected, an output terminal from which, in use,
- a corrected signal is taken,
- a time-delay circuit having its input connected to the input terminal,
- a differentiator having its input connected to the input terminal,
- a circuit whose input/output characteristic is non-linear and skew-symmetrical having its input connected to the output of the differentiator,
- a further differentiator having its input connected to the output of the non-linear skew-symmetric circuit,
- a signal combining circuit operative to combine the output of the further differentiator and the output of the delay circuit, and
- means connecting the output of the signal combining circuit to the output terminal.
6 more elements
A waveform correction circuit comprising:
- an input terminal for receipt of a signal to be corrected,
- an output terminal from which, in use, a corrected signal is taken,
- a time-delay circuit having its input connected to the input terminal,
- a differentiator having its input connected to the input terminal,
- first amplifier means having its input connected to the output of the differentiator,
- a circuit whose input/output characteristic is non-linear and skew-symmetrical having its input connected to the output of the first amplifier means,
- a further differentiator having its input connected to the output of the non-linear skew-symmetric circuit,
- second amplifier means having its input connected to the output of the further differentiator,
- a signal combining circuit operative to combine the output of the second amplifier means and the output of the delay circuit, and
- means connecting the output of the signal combining circuit to the output terminal.
7 more elements
Dependencies are inferred from the claim text.