Circuit applied to display device and related signal processing method

Abstract

An electric circuit applied to a display device includes an analog front end electric circuit, a time domain frequency domain converting circuit and a pulse interference detecting electric circuit, and the analog front end electric circuit is used for converting an analog input signal into a digital input signal; the time domain frequency domain converting circuit is coupled to the analog front end electric circuit and is used for converting the digital input signal from a time domain to a frequency domain to generate a frequency domain signal; the pulse interference detecting electric circuitis coupled to the time domain frequency domain converting circuit and is used for detecting the noise strength of the frequency domain signal to generate a detecting result, and the detecting resultis used for judging whether the analog input signal has pulse interference or not.

Description

technical field [0001] The invention relates to signal processing inside a display device, in particular to a pulsed interference detection circuit applied to a display device and a related signal processing method. Background technique [0002] In the second-generation digital mobile TV standard (DVB-T2), impulsive interference (impulsive interference) is regarded as a problem that seriously affects image display. Impulsive interference has sudden and periodic strong amplitudes, and It is usually generated by the surrounding environment, such as running washing machines, dishwashers, and whizzing cars...etc. Please refer to figure 1 Shown is a schematic diagram of a pulsed interference, while in figure 1 In , the impulsive interference can contain multiple burst periods with different intervals or lengths, and each burst period contains one or more pulses, where figure 1 The pulse period, pulse amplitude, pulse interval, burst interval and other relevant descriptions are...

AI Technical Summary

Problems solved by technology

In the prior art, it is judged whether there is pulse interference in the received signal by detecting whether there is a sudden high-power amplitude in the signal, and based on this, the signal processing method of the subsequent circuit is controlled. However, for certain types of pulse interference , the detection method of the previous technology may cause misjudgment

For example, in the second-generation test standard announced by the Digital-TV Group (DTG), some test items have a very long burst duration, and each burst period has many pulses. ), for example, a burst period contains 400 to 40,000 pulses. When the energy of these pulsed interferences is strong, the known detection methods may still be able to detect them. However, when the energy of these pulsed interferences is weak , may be covered by normal signals, which makes it impossible for these test items to judge whether the received signal has pulse interference simply by detecting the amplitude strength of the received signal

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