Method and apparatus for canceling the effects of noise in an electronic signal
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United States of America Patent
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Nov 25, 2003
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N/A
app pub date -
Nov 2, 1999
filing date -
Nov 2, 1999
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Abstract
A method and apparatus for canceling the effect of radiated noise on an electronic signal is disclosed. Particularly, in an electronic camera, a noise cancellation circuit consisting of a control means for controlling the timing of a radiated noise signal generated by a noise-generating source, a storage means for storing an anti-noise signal that comprises a digital representation of a complement of the radiated noise signal; and a summing circuit for summing digital image signals containing the radiated noise signal component and the anti-noise signal are disclosed. The control means generates a control signal in synchronization with a pulse of a pixel sample clock. This control signal triggers the noise-generating source such that the radiated noise signal is also synchronized to the pulse of the pixel sample clock. The radiated noise signal is conducted into the electronic signal path. The summing circuit adds the anti-noise signal, being a complement of the radiated noise signal, to the image signal to cancel the effect of the radiated noise.
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