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Controlling on-screen displays

A screen display, channel frequency technology, applied in the direction of TV, color TV parts, TV system parts, etc., can solve the problem of expensive additional circuits

Inactive Publication Date: 2004-09-29
KONINK PHILIPS ELECTRONICS NV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Alternatively, US 4677484 proposes a dedicated deflection signal source and control means to divert the source from the operation in which it is synchronized to the received synchronization signal when the incoming signal is determined to have an invalid or inappropriate synchronization signal mode switching to free-running mode, which also requires expensive additional circuitry

Method used

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  • Controlling on-screen displays

Examples

Experimental program
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Embodiment Construction

[0028] exist figure 1 , a known signal flow diagram is shown in which an incoming radio frequency (RF) signal is received by an antenna 1 and transmitted to a television tuner 2 . In a known method, the RF signal passes through a picture intermediate frequency phase-locked loop demodulator circuit (PIF PLL) 3, which demodulates the received signal in order to separate it into its constituent video and synchronization signals. The video signal is sent to the video processor 4, and the sync signal is applied to the sync separator 5. The separator 5 can separate the horizontal synchronization signal H.sync from the vertical synchronization signal V.sync. The horizontal signal H.sync is also applied to the first phase detector 6 and to the coincidence detection circuit 7 in a known manner. The output of the first phase detector 6 is filtered by a low-pass filter and fed to a horizontal oscillator 8 which in turn provides a horizontal timing circuit 10 with a horizontal display t...

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PUM

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Abstract

Apparatus for controlling synchronization of on-screen display information in an auto-search mode of a radio-frequency receiver (2) connected to scan an incoming signal for valid channel frequencies. The apparatus comprises: a picture intermediate frequency phase-locked loop detector (17) for supplying an output signal indicating whether an intermediate frequency demodulator is in an unlocked mode which is the case if the incoming signal frequency does not correspond to a valid channel frequency, or in a locked mode, which is the case if the incoming signal frequency does correspond to a valid channel frequency; a video detector (18) for detecting a video property in the incoming signal, a synchronization phase control loop (6, 8, 10) which is closed if the video property is detected and the output signal indicates the locked mode, a memory for storing the frequency of the incoming signal as a valid channel when the phase control loop (6, 8, 10) is closed and a horizontal oscillator (8) connected to free run when the phase control loop (6, 8, 10) is open. This stabilizes an on-screen display even when no signal is present or a weak signal is present.

Description

technical field [0001] This invention relates to screen displays, and more particularly to displays typically used on image screens when a television tuner is in an auto-seek mode. Background technique [0002] An On Screen Display (OSD) typically contains alphanumeric and / or pictorial characters to provide the user with information such as channel numbers, program selections, and prompt instructions. Typically, the OSD signal is provided to the luminance / chrominance processing section of a television receiver for display on the screen superimposed on any image signal received by the tuner. To ensure that the OSD always appears at the same location on the screen, it is synchronized to horizontal and vertical deflection timing pulses which are separated from the received television signal in the receiver. [0003] A problem arises, for example, when no image signal is received during tuning or when the OSD is required when the image signal is weak. The timing pulses are the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N5/12H04N5/44H04N5/445
CPCH04N21/4302H04N5/44504H04N5/445
Inventor G·J·王B·L·泰
Owner KONINK PHILIPS ELECTRONICS NV