Television receiver for teletext

• US 6,532,041 B1
• Filed: 09/26/1996
• Issued: 03/11/2003
• Est. Priority Date: 09/29/1995
• Status: Expired due to Fees

• Current Assignee: Matsushita Electric Industrial Company Limited (Panasonic Holdings Corporation)
• Original Assignee: Matsushita Electric Industrial Company Limited (Panasonic Holdings Corporation)
• Inventors: Monta, Hiroki, Kawane, Tomoe
• Primary Examiner(s): Harvey, David E.
• Application Number:
  US08/721,169
• Time in Patent Office: 2,357 Days
• Field of Search: H04/N.5445, H04/5.44, H04/7.08, H04/7.087, H04/9.74, 348/468, 348/589, 348/597, 348/584, 348/598, 348/585, 348/599, 348/586, 348/600, 348/564, 348/562, 358/147, 358/142
• US Class Current: 348/468
• CPC Class Codes: H04N 5/445 for displaying additional information H04N5/50 takes precedence
• CPC Class Codes: H04N 7/0122 the input and the output signals having different aspect ratios
• CPC Class Codes: H04N 7/0882 for the transmission of character code signals, e.g. for teletext circuits for the digital non-picture data signal H04N7/035
• CPC Class Codes: H04N 7/0884 for the transmission of additional display-information, e.g. menu for programme or channel selection
• CPC Class Codes: H04N 7/0885 for the transmission of subtitles

Abstract

The present invention relates to a television receiver for teletext for receiving a composite video signal having text information multiplex on a television video signal, and more particularly to a television receiver for teletext capable of displaying the television video signal and teletext screen simultaneously on the picture screen by superimposing or dividing the screen, and according to this television receiver for teletext, which comprises preprocessing means for issuing various preprocessing correction signals on the basis of the teletext signal extracted by the teletext signal receiving means, the preprocessing correction signal issued by the preprocessing means, and the teletext signal received by the teletext signal receiving means are combined and displayed on the picture screen, and thereby the boundary of the television video signal and teletext signal is clearer, so that the text of thetelet ext signal is easier to read.

Claims

1. A television receiver for teletext comprising:

a video chroma signal processing circuit for demodulating a composite video signal into a video chroma signal,

a teletext signal receiving circuit for extracting a teletext signal superposed in the composite video signal, determining if said teletext signal is character data or graphics data, and providing a foreground color or a background color based on whether said teletext signal is character data or graphics data; and

a switch for displaying the video chroma signal from the video chroma signal processing circuit and the teletext signal from the teletext signal receiving circuit simultaneously on a picture screen,

wherein, if said teletext signal is character data, said foreground color is reset to a fixed color and said background color is reset to a YM color.

2. A television receiver for teletext comprising:

a video chroma signal processing circuit for demodulating a composite video signal into a video chroma signal,

a teletext signal receiving circuit for extracting a teletext signal superposed in the composite video signal, determining if said teletext signal is character data or graphics data, and providing a foreground color or a background color based on whether said teletext signal is character data or graphics data; and

a switch for displaying the video chroma signal from the video chroma signal processing circuit and the teletext signal from the teletext signal receiving circuit simultaneously on a picture screen,

wherein, if said teletext signal is graphics data and said background color is transparent, said background color is reset to a YM color.