Thomson Licensing S.a.

Thomson Consumer Electronics Inc.

Mark Robert Zukas

Mark Francis Rumreich

Ronald Thomas Keen

A chrominance signal C is separated (,) into component vectors U and V and coupled via respective paths each including a controllable gain amplifier (,) to respective outputs (,). A chroma overload protection unit (,) is provided including a saturation calculator (,) determines the saturation of the vector components and provides a saturating indicating signal to a gain characteristic unit (,) which jointly controls the gain of the amplifiers to proportionally limit the vector component magnitudes as a given function of the saturation indicating signal on a pixel by pixel basis thereby providing output component vectors (U,V) exhibiting no tint shift upon limiting conditions. In a digital embodiment, the amplifiers are implemented by multipliers (,) having outputs subjected to symmetrical rounding (,), saturation is calculated (,A) by an approximation to the square root of the sum of squares of the vector components, and plural look up tables (,A) are provided for generating the gain control signal G.

Apparatus and method for preventing oversaturation of chrominance signals

A method and apparatus for reformatting auxiliary information such as closed caption text that is extracted from a television signal. The apparatus reformats the text by removing redundant spaces, reorganizing the text to fit into an arbitrary sized closed caption window, converting any closed caption display mode (e.g., pop on, paint on or roll up) into a modified roll on display, and inserting speaker identifier prompts into the caption.

Method and apparatus for reformatting auxiliary information included in

Method and apparatus for generating a signal representing a multi-image video display including a main image and an auxiliary image, e.g., a picture-in-picture (PIP) image, provides for positioning auxiliary information, such as closed caption text, proximate the auxiliary image. The auxiliary information is located within a border region for the auxiliary image and positioned for indicating to a user that the auxiliary information is associated with the auxiliary image. The region containing the auxiliary information moves in response to movement of the auxiliary image such that the auxiliary information remains proximate the auxiliary image.

Method and apparatus for positioning auxiliary information proximate an

Apparatus and a method for displaying text information include a scrolling feature having a modulated scroll rate. Previously undisplayed text information stored in the buffer memory is accessed and scrolled into the display at a rate related to the amount of previously undisplayed text information stored in the buffer memory. Scrolling involves a pause in the movement of the displayed text after each complete row of text information is displayed. The pause duration is related to the amount of previously undisplayed text stored in the buffer memory. The text information may include closed caption information, teletext information, and text information associated with moving message displays.

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Indianapolis, IN, United States of America

Mark Robert Zukas