Patent ID: 8761267
Filing Date: 2014-06-24
Classification: H04N

Abstract:
1. A noise estimator device of a video decoder utilized for decoding an analog video signal, comprising: a reception end coupled to an output end of an analog-to-digital converter of the video decoder; a low-pass filter coupled to the reception end, for performing low-pass filtering for each period of signals received by the reception end, for generating a plurality of low-pass filtering results; a delay circuitry coupled to the reception end, configured by a first logical circuit, executing a step of prolonging a timing sequence of the signals received by the reception end; a minimum level estimation circuitry coupled to the low pass filter, configured by a second logical circuit, executing a step of estimating a minimum value of a specific number of low-pass filtering results in the plurality of the low-pass filtering results; a difference level estimation circuitry coupled to the low pass filter, the delay circuitry, and the minimum level estimation circuitry, configured by a third logical circuit, executing steps of determining a synchronization signal of the analog video signal according to the plurality of the low-pass filtering results and the minimum value of the specific number of the low-pass filtering results, and estimating a noise level of the analog video signal according to the synchronization signal and signals outputted from the delay circuitry; and an output end coupled to the difference level estimation circuitry, for outputting the estimating result of the difference level estimation circuitry to a digital signal processor of the video decoder.