METHOD AND APPARATUS FOR REPRESENTATION OF VIDEO AND AUDIO SIGNALS ON A LOW-RESOLUTION DISPLAY

• US 20110221957A1
• Filed: 03/14/2011
• Published: 09/15/2011
• Est. Priority Date: 04/08/2002
• Status: Active Grant

• Current Assignee: 0960471 B.C. Unlimited Liability Company, Imagine Communications Limited (Gores Broadcast Holdings LLC)
• Original Assignee: Leitch Technology International, Inc.
• Inventors: Twarecki, Artur B., Batchelor, Mark
• Granted Patent: US 9,183,773 B2
• Time in Patent Office: Days
• US Class Current: 348/441
• CPC Class Codes: G09G 2320/0247 Flicker reduction other than flicker reduction circuits used for single beam cathode-ray tubes
• CPC Class Codes: G09G 2340/0407 Resolution change, inclusive of the use of different resolutions for different screen areas
• CPC Class Codes: G09G 2340/145 related to small screens
• CPC Class Codes: G09G 3/001 using specific devices not provided for in groups G09G3/02 - G09G3/36, e.g. using an intermediate record carrier such as a film slide; Projection systems; Display of non-alphanumerical information, solely or in combination with alphanumerical information, e.g. digital display on projected diapositive as background slide projectors per se G03B23/00 = 42 HP
• CPC Class Codes: G09G 3/2029 the sub-frames having non-binary weights

Abstract

The method for the representation of video and audio signals on a low-resolution display panel, which includes the steps of: scaling the video or audio frame to fit the display panel, quantization of the video or audio signals to predetermined level values, temporal representation of video data by using the pulse density modulation, sending the signal pulses to the display panel. In further aspect the step of temporal representation contains the anti-flickering signal manipulation technique incorporating maximization of separation of the pulses during the pulse density modulation.

Claims

1. A method for modulation of a video signal for display on a low-resolution display, the method comprising:

scaling the video signal to fit the low-resolution display;

quantizing the video signal to predetermined level values;

generating a pulse density modulated representation of the scaled and quantized video signal; and

sending the pulse density modulated representation of the scaled and quantized video signal directly to a display buffer for output to the low-resolution display.