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Locking and detecting device of digital broadcasting receiver and method

A technology of a broadcast receiver and a detection method, which is applied in the direction of automatic power control, color TV parts, TV system parts, etc., and can solve the problems of prolonging the convergence time, long calculation time of signal synchronization device convergence time, and inability to increase Problems such as timing frequency and phase offset convergence processing, to achieve the effect of preventing locking detection errors, more accurate convergence characteristics, and rapid locking processing

Inactive Publication Date: 2008-01-09
LEJIN GUANGDIAN ELECTRONIC CO LTD SHANGHAI
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Problems solved by technology

[0027] This kind of locking error will not only prolong the convergence time, but also cannot converge the large timing frequency and phase offset.
[0028] Although the appropriate critical value can be obtained by using the SNR calculator, the convergence time of the signal synchronization device will be as long as the calculation time of the SNR computer; it can have less residual characteristics, but it cannot have faster synchronization capture convergence characteristics, so Does not function properly as a lock detector

Method used

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  • Locking and detecting device of digital broadcasting receiver and method
  • Locking and detecting device of digital broadcasting receiver and method
  • Locking and detecting device of digital broadcasting receiver and method

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Embodiment Construction

[0057] The configuration and functions of the embodiments of the present invention will be described below with reference to the accompanying drawings.

[0058] Fig. 4 is a block diagram of a timing recovery device including a timing lock detector in the present invention.

[0059] As shown in Figure 4, the timing recovery device in the present invention includes the following devices: the signal synchronization device 100, according to the degree of convergence, determines the band width of the timing recovery loop through a plurality of stages; the timing lock detection device 200, which can detect out locked.

[0060] Above-mentioned signal synchronizing device 100 is made up of following several stages: Timing error detection device 101, receives baseband signal, detects timing error with this; Gain selection device 103, receives above-mentioned timing error value, and selects loop gain according to each stage, determines thus The band width of the timing recovery loop; t...

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Abstract

The invention relates to a digital broadcast receiver, in particular to a locking detecting device and a method thereof for digital broadcast receiver. The method is characterized in that the convergent features better than the signal synchronizer are obtained through a plural of stages according to the convergent degree; and the bandwidth of a time-lapse recovery loop is decided by the signal synchronizer. The invention comprises the operation steps as follow: the time-lapse error signal average DC power obtained according to the channel condition is counted in a time-lapse error detector of the signal synchronizer; the average DC power counting value is compared with the unit signal flutter value power; locking and unlocking counting signals are generated according to the comparing result; the a locking and unlocking counting signals are counted till reaching the critical value, and locking and unlocking signals are generated; and control signals of the locking stage are generated according to the locking and unlocking signals. The invention has the advantages of avoiding locking detecting errors and obtaining quicker and more accurate convergent features.

Description

technical field [0001] The invention relates to a digital broadcast receiver, in particular to a digital broadcast receiver lock detection device and method. Background technique [0002] The QAM (Quadrature Amplitude Modulation) receiver signal synchronization module, which is generally selected as the standard digital TV cable channel transmission method, is the process of playing the signal column clock, also called clock synchronization or clock player. [0003] The purpose of the above-mentioned signal synchronization is to accurately lock the starting point of signal migration at the receiver according to the received data sequence. [0004] Therefore, such a signal synchronization process is a necessary process in the digital communication demodulation process, and a lock detector (Lock detector) is used in order to obtain better convergence characteristics. [0005] Next, the functions of the above-mentioned signal synchronization device including the lock detector ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N5/44H04L25/40H03L7/095
Inventor 李泰原
Owner LEJIN GUANGDIAN ELECTRONIC CO LTD SHANGHAI
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