Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1990-10-10
1993-10-19
Groody, James J.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
455212, 455222, 330 51, H04N 560
Patent
active
052550940
ABSTRACT:
A muting circuit for eliminating transient signals generated due to power supply "turn-on" and "turn-off" is presented. In one embodiment, a junction in a signal chain is AC shunted to ground independent of the DC status of the junction. This shunting is in response to a signal generated by a power supply controlling microprocessor when the microprocessor energizes or de-energizes the power supply for a portion of the signal chain coupling signal to the acted upon junction. In another embodiment, the junction is AC coupled to ground during turn-on through a diode in series with a capacitor with the diode first being forward biased and then reverse biased to remove the AC shunt. The biassing of the diode is accomplished by application of two different sources of voltage to respective electrodes of the diode.
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Tiam Goh S.
Yong Lui T.
Burgess Glenton B.
Emanuel Peter M.
Groody James J.
Thomson Consumer Electronics S.A.
Tripoli Joseph S.
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