Patent ID: 6937294
Filing Date: 2005-08-30
Classification: H04N

Abstract:
1. An apparatus including a signal multiplexor for controlling and multiplexing video image and on-screen-display (OSD) signals, comprising: a first control circuit that following reception of a first reference signal, a contrast control signal and a clamped video signal provides a first controlled signal with a contrast-controlled video component; a first signal combining circuit, coupled to said first control circuit, that in response to a first combining control signal receives and selectively combines an OSD signal and said first controlled signal to thereby provide a first combination signal with said contrast-controlled video component and an OSD component; a second control circuit, coupled to said first signal combining circuit, that following reception of said first combination signal, said first reference signal and a gain control signal provides a second controlled signal with a contrast-controlled and gain-controlled video component and a gain-controlled OSD component; and a second signal combining circuit, coupled to said second control circuit, that in response to a second combining control signal receives and selectively combines said second controlled signal and a second reference signal to thereby provide a multiplexed signal with said contrast-controlled and gain-controlled video component, said gain-controlled OSD component and a reference signal component.