Patent ID: 6961396

Claim:
A digital blanking circuit, comprising: an input connected to receive a digital input signal, an output, a rising edge latch which receives said digital input signal and a first select signal at respective inputs, said first select signal having first and second states, said rising edge latch arranged to produce an output which tracks said digital input signal when said first select signal is in its first state and latches said digital input signal upon the first occurrence of a low-to-high transition of said digital input signal after said first select signal transitions from its first state to its second state, a falling edge latch which receives said digital input signal and a second select signal at respective inputs, said second select signal having first and second states, said falling edge latch arranged to produce an output which tracks said digital input signal when said second select signal is in its first state and latches said digital input signal upon the first occurrence of a high-to-low transition of said digital input signal after said second select signal transitions from its first state to its second state, and a two-to-one multiplexer which receives the outputs of said rising and falling edge latches and a third select signal at respective inputs, said third select signal having first and second states, said multiplexer arranged to transfer the output of said rising edge latch to an output when said third select signal is in its first state and to transfer the output of said falling edge latch to said multiplexer output when said third select signal is in its second state, said multiplexer output being said digital blanking circuit output, a blanking interval circuit connected to receive said digital blanking circuit output at its input and arranged to trigger a blanking interval having a first duration upon the occurrence of a rising edge at its input, to trigger a blanking interval having a second duration upon the occurrence of a falling edge at its input, and to provide said first, second and third select signals such that said digital blanking circuit output is prevented from re-transitioning during a blanking interval.