Display apparatus

• US 6,587,153 B1
• Filed: 10/05/2000
• Issued: 07/01/2003
• Est. Priority Date: 10/08/1999
• Status: Expired due to Term

• Current Assignee: Matsushita Electric Industrial Company Limited (Panasonic Holdings Corporation)
• Original Assignee: Matsushita Electric Industrial Company Limited (Panasonic Holdings Corporation)
• Inventors: Unemura, Toyoaki
• Primary Examiner(s): Lee, Michael
• Application Number:
  US09/679,817
• Time in Patent Office: 999 Days
• Field of Search: H04/N.700, 348/468, 348/465, 348/705, 348/706, 348/563, 348/564, 348/553, 348/554
• US Class Current: 348/468
• CPC Class Codes: H04N 21/4884 for displaying subtitles
• CPC Class Codes: H04N 5/445 for displaying additional information H04N5/50 takes precedence
• CPC Class Codes: H04N 5/46 for receiving on more than one standard at will deflecting circuits of multi-standard receivers H04N3/27
• CPC Class Codes: H04N 7/035 Circuits for the digital non-picture data signal, e.g. for slicing of the data signal, for regeneration of the data-clock signal, for error detection or correction of the data signal
• CPC Class Codes: H04N 7/0885 for the transmission of subtitles

Abstract

In a display apparatus (PI) displaying a closed-caption (Scc, DS) multiplexed in the first and second component video signals (Scv1: Y, PB, and PR, Svc2: Y and C) received from externally provided video signal sources, a video signal selector (7) selects one of said first and second component video signals (Scv1, Scv2); a closed-caption extractor (3) extracts the closed-caption (Scc, DS) from said selected one of first and second component video signals (Scv1, Scv2); and a controller (10) controls the closed-caption extractor (3) based on the format type of the selected first and second component video signals (Scv1 and Scv2).

Claims

1. A display apparatus for displaying a closed-caption multiplexed in different format types of video signals received from externally provided video signal sources, said apparatus comprising:

first component video signal receiving means for receiving a first component video signal from one of said video signal sources;

second component video signal receiving means for receiving a composite video signal from another of said video signal sources to produce a second component video signal;

selection means for selecting one of said first and second component video signals;

closed-caption extraction means for extracting said closed-caption from said selected one of first and second component video signals; and

control means for controlling said closed-caption extraction means based on the format type of said selected one of first and second component video signals.

2. The display apparatus, as claimed in claim 1, wherein

said control means enables said closed-caption extraction means when said second component video signal is selected.

3. The display apparatus, as claimed in claim 1, further comprising video format determination means for determining a video format type of said first component video signal based on a luminance signal thereof when said first component video signal is selected, wherein

said control means controls said closed-caption extraction means based on said determined video format type.

4. The display apparatus, as claimed in claim 3, wherein

said control means enables said closed-caption extraction means only when said determined video format type is NTSC.

5. The display apparatus, as claimed in claim 3, wherein

said video format determination means comprises:

synchronizing extraction means for extracting a horizontal synchronization signal and a vertical synchronization signal from said luminance signal;

video signal format storing means for storing discrimination data discriminating each of said plurality of video formats; and

determination means for comparing said extracted horizontal and vertical signals with said discrimination data to determine the video format type of said first component video signal.