Patent ID: 7532253
Filing Date: 2009-05-12
Classification: H04N

Abstract:
1. A method for changing channels on a television, comprising: receiving a first video signal on a first port; transmitting the first video signal from the first port to a frame memory; receiving a second video signal on a second port; transmitting the second video signal from the second port to the frame memory; controlling the frame memory using a memory interface the memory interface comprising a picture-in-picture source register (PIPSRC); defining a primary portion of a screen; defining a secondary portion of the screen; displaying a first channel on the primary portion of the screen; receiving an input indicating a channel change; and displaying a subsequent channel on the secondary portion of the screen responsive to an indication from the picture-in-picture source register (PIPSRC), wherein the secondary portion of the screen is smaller than the primary portion of the screen, and wherein displaying the subsequent channel is responsive to the input while continuing to display the first channel on the primary portion of the screen, such that the first channel remains on the primary portion of the screen responsive to receiving subsequent inputs indicating channel changes.