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Apparatus and method for digital television to trace identification signal according to signal source locking status

A locked state, digital TV technology, applied to color TV parts, TV system parts, TVs, etc., can solve the problem of not being able to display images normally

Inactive Publication Date: 2009-03-11
KONKA GROUP
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is that when the signal sent by the information source changes in digital television, the old parameters such as carrier mode, mapping mode, and internal code rate are used, and the image cannot be displayed normally. In order to overcome this If the defect exists, the signal must be detected again, and the parameter information of the current signal must be identified again, in order to obtain the normal display of the image

Method used

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  • Apparatus and method for digital television to trace identification signal according to signal source locking status
  • Apparatus and method for digital television to trace identification signal according to signal source locking status

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Embodiment Construction

[0015] refer to figure 1 , indicating the device structure of the digital TV to track the identification signal according to the source locking state figure 1 , the device includes 4 module parts, they are a timing module 11, used to set the query time and a data collection time; it is connected to a counting module 12, it is used to record the total number of queries and the time in a certain period of time The number of times of the unlocked state; it is connected to a data identification module 13 again, and this module is to identify whether the current signal is in the locked state; This module is connected to a digital signal identification module 14 again, and it is the carrier wave used to identify the digital signal Mode, mapping method, inner code rate, frame header, and interleaving parameter information.

[0016] refer to figure 2 , indicating the specific operation flow of the device 1, recorded according to the flow

[0017] a. Start, set the timer T1, set th...

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Abstract

The invention relates to a device and a method which are used by a digital TV to lock up a state track identification signal and belong to the filed of digital TVs. The device comprises four modules which have the connecting relation that a time counting module is connected to a number counting module and then to a data identification module and finally to a digital signal identification module. The device is operated according to the following processes: a timer T1 is arranged, a time interval of t1 is determined, and the number counter is initialized; the timer T1 is started when a current source is a digital TV; judgment is performed when Counter Num is equal to N which represents a predetermined number of detection times; and finally the number counter is cleared and the process is started again. The invention can perform signal identification automatically according to the change of a signal lock-up state and does not influence normal watch of a user when a signal modulation method changes.

Description

technical field [0001] The invention belongs to the field of digital television, and in particular relates to a device and method for tracking and identifying signals according to the locked state of a signal source, which are applied in domestic digital television media. Background technique [0002] In digital TV, the input signal needs to be digitally demodulated, because different transmission channels (such as satellite, cable, terrestrial broadcasting, etc.) adopt different digital modulation methods according to their different transmission characteristics, so according to different signal sources , the digital demodulation method of the receiver is correspondingly different (for example, satellite - quadrature phase shift keying method QPSK, cable - commonly used level quadrature modulation method QAM, terrestrial broadcasting - level vestigial sideband VSB or Coded Orthogonal Frequency Division Multiplexing (COFDM), the role of channel decoding is to recover the sam...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N5/44H04N5/00
Inventor 刁艳侠
Owner KONKA GROUP
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