Patent ID: 7554607
Filing Date: 2009-06-30
Classification: H04N

Abstract:
1. An apparatus including a signal detector, comprising: a signal electrode to convey an input signal with at least first and second magnitudes during first and second intervals, respectively, and a period substantially equal to a sum of said first and second signal intervals; first voltage generating circuitry coupled to said signal electrode and responsive to said input signal by providing a first voltage that charges toward first and second opposing values during said first and second signal intervals, respectively, and including second voltage generating circuitry coupled to said signal electrode and responsive to said input signal by providing a second voltage that charges toward said second and first opposing values during said first and second signal intervals, respectively, and including detection circuitry coupled to said first and second voltage generating circuitries, and responsive to said first and second voltages by providing a detection signal indicative of a difference between said first and second voltages.