System and method for an adaptive state machine to control signal filtering in a serial link
OwnerJames Lyleinventor
Life of this patent
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Abstract
A method for adaptively filtering a control signal in a serial link includes monitoring for a blanking interval in a video stream having an associated clock signal and monitoring for an occurrence of a VSNYC signal once the blanking interval has started. A control signal is initially detected wherein the control signal occurs subsequent to the occurrence of the VSNYC signal. A set of properties of the control signal are recorded and a set of filter parameters are adjusted for detecting the control signal in a next blanking period based on the set of properties of the control signal.
Claims13
A receiver for adaptively filtering a control signal in a serial link, the receiver comprising:
- a plurality of input ports adapted to receive a plurality of data signals and a clock signal on a plurality of differential pairs at said input ports;
- a demodulator responsive to the plurality of data signals and the clock signal and operative to develop a control signal, a plurality of synchronization signals, and the clock signal;
- a content protection state machine responsive to the plurality of synchronization signals, a filtered control signal, and the clock signal;
- a filter responsive to the control signal and a filter parameter signal and operative to develop the filtered control;
- and
- a control machine responsive to the control signal and operative to develop the filter parameter signal, wherein the filter parameter signal is updated based on a set of characteristics of the control signal.
A method for adaptively filtering a control signal in a serial link, the method comprising:
- receiving a plurality of data signals and a clock signal on a plurality of differential pairs;
- generating a control signal, a plurality of synchronization signals, and the clock signal;
- generating an authentication signal using a content protection state machine responsive to the plurality of synchronization signals, a filtered control signal, and the clock signal;
- generating a filtered control signal from the control signal and a filter parameter signal;
- and
- generating a filtered parameter signal from the control signal, wherein the filter parameter signal is updated based on a set of characteristics of the control signal.
A transmitter for use in a serial link, the transmitter being responsive to an authentication signal and operative to generate a plurality of data signals and a clock signal on a plurality of differential pairs;
- and, means for communicating at least some of the a plurality of data signals and a clock signal to a receiver.
Dependencies are inferred from the claim text.