STW8009_07 Datasheet, PDF (40/66 Pages) STMicroelectronics – Mobile video DENC

STw8009/STw8019
Control registers
chroma_main_coef4 = Actual value + 32;
chroma_main_coef5 = Actual value + 32;
chroma_main_coef6 = Actual value
chroma_main_coef7 = Actual value
chroma_main_coef8 = Actual value
Default values:
chroma_main_coef0[4:0] = 10001
means c0 = 1.
chroma_main_coef1[5:0] = 100111
means c1 = 7;
chroma_main_coef2[6:0] = 1010100
means c2= 20;
chroma_main_coef3[6:0] = 1000111
means c3 = 39;
chroma_main_coef4[7:0] = 01011111 means c4 = 63;
chroma_main_coef5[7:0] = 01110111 means c5 = 87;
chroma_main_coef6[7:0] = 01101100 means c6 = 108;
chroma_main_coef7[7:0] = 01111011 means c7 = 123;
chroma_main_coef8[8:0] = 010000000 means c8 = 128.
The FIR symmetrical filter has the following response:
H (z) = c₀ + c₁z^–1 + c₂z^–2 + + c₇z^–7 + c₈z^–8 + c₇z^–9 + + c₂z^–14 + c₁z^–15 + c₀z^–16
The filter working frequency is comprised in the range [pix_clk, 27 MHz] and the filtering is
done on upsampled signal (half pix_clk to pix_clk frequency by padding by zeros).
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