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SDA9410-B13 Datasheet(PDF) 44 Page - Micronas |
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SDA9410-B13 Datasheet(HTML) 44 Page - Micronas |
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44 / 179 page  SDA9410 Preliminary Data Sheet Input signal processing 44 Micronas Table 25 Input write I²C Bus parameter 5.4.4 Noise measurement The noise measurement algorithm can be used to change the I²C Bus parameters of the temporal noise reduction processing depending on the actual noise level of the input signal. This is done by the I²C Bus controller which reads the NOISEME value, and sends depending on this value different I²C Bus parameter sets to the temporal noise reduction registers of the SDA 9410. The NOISEME value can be interpreted as a linear curve from no noise (0) to strong noise (30). Value 31 indicates an overflow status and can be handled in different ways: strong noise or measurement failed. Two measurement algorithms are included, which can be chosen by the I²C Bus parameter NMALG. In case NMALG=1 the noise is measured during the vertical blanking period in the line defined by NMLINE. For NMALG=0 the noise is measured during the first active line. In the latter case the delay of the noise reduction algorithm must be set to the frame difference value (DTNRON=0, I²C Bus sub address 1Ah). In both cases the value is determined by averaging over several fields. The Figure 18 shows an example for the noise measurement. The NMLINE I²C Bus parameter determines the line, which is used in the SDA 9410 for the measurement. In case of VINDEL=0 and NMLINE=0 line 3 of the field A and line 316 of the field B is I²C Bus parameter Sub address Description NRON 1: on 0: off 1Ah Temporal Noise Reduction of Luminance and Chrominance On (SRC-Mode) TNRSEL 1: separate 0: luminance motion detector 18h Switch for motion detection of temporal noise reduction of chrominance signal DTNRON 1: field 0: frame 1Ah Delay for temporal noise reduction of luminance and chrominance signal TNRFIY/C 1: off 0: on 18h/19h Switch for fixed K-factor value defined by TNRVAY/C TNRVAY/C 17h Fixed K-factor for temporal noise reduction of luminance/chrominance TNRHOY/C 18h/19h Horizontal shift of the motion detector characteristic TNRKOY/C 16h Vertical shift of the motion detector characteristic TNRCLY/C 15h Classification of temporal noise reduction |
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