ANSI/EIA 549-1988 NRSC AM Stereo Emphasis & RC Selection Table ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Freq. NRSC NRSC Group .001uf .0012uf .0018uf .0027uf .0033uf .0039uf .0047uf .0056uf .0068uf .0075uf .0082uf Hertz Emphasis Phase Delay 56K 18K 47K 15K 33K 10K 22K 6.8K 16K 5.6K 15K 4.7K 12K 3.9K 10K 3.3K 8.2K 2.7K 7.5K 2.4K 6.8K 2.2K ~~~~~ ~~~~~~~~ ~~~~~~ ~~~~~ ~~~~~~~ ~~~~~~~ ~~~~~~~ ~~~~~~~~ ~~~~~~~~ ~~~~~~~~ ~~~~~~~~ ~~~~~~~~ ~~~~~~~~~ ~~~~~~~~~ ~~~~~~~~~ 50 0.002 1.020 56.69 0.002 0.002 0.002 0.002 0.002 0.002 0.002 0.002 0.002 0.002 0.002 100 0.009 2.039 56.65 0.009 0.009 0.01 0.006 0.008 0.01 0.009 0.009 0.009 0.009 0.009 400 0.142 8.042 55.85 0.139 0.14 0.152 0.103 0.128 0.15 0.141 0.14 0.139 0.14 0.138 700 0.421 13.655 54.19 0.41 0.415 0.449 0.306 0.379 0.441 0.417 0.414 0.41 0.413 0.408 1000 0.814 18.674 51.87 0.795 0.803 0.867 0.601 0.736 0.853 0.808 0.802 0.795 0.8 0.79 1500 1.633 25.472 47.17 1.598 1.614 1.73 1.239 1.488 1.703 1.622 1.61 1.598 1.608 1.59 2000 2.537 30.357 42.16 2.489 2.511 2.675 1.981 2.33 2.636 2.521 2.504 2.487 2.503 2.477 2500 3.436 33.642 37.38 3.379 3.406 3.607 2.756 3.177 3.557 3.416 3.394 3.374 3.396 3.364 3000 4.281 35.700 33.06 4.219 4.25 4.48 3.517 3.982 4.42 4.258 4.231 4.21 4.238 4.201 3500 5.054 36.856 29.25 4.989 5.023 5.275 4.239 4.723 5.206 5.029 4.998 4.975 5.01 4.969 4000 5.75 37.361 25.95 5.684 5.72 5.989 4.911 5.394 5.912 5.723 5.688 5.665 5.707 5.662 4500 6.371 37.403 23.09 6.306 6.344 6.626 5.527 5.994 6.54 6.342 6.303 6.281 6.329 6.283 5000 6.924 37.116 20.62 6.86 6.899 7.191 6.09 6.53 7.098 6.893 6.851 6.83 6.885 6.835 5500 7.415 36.601 18.49 7.353 7.394 7.693 6.601 7.007 7.592 7.382 7.337 7.317 7.379 7.327 6000 7.85 35.930 16.63 7.791 7.833 8.139 7.065 7.431 8.031 7.816 7.767 7.749 7.817 7.764 6500 8.237 35.155 15.02 8.181 8.224 8.535 7.485 7.808 8.42 8.202 8.151 8.133 8.207 8.153 7000 8.581 34.314 13.62 8.529 8.572 8.887 7.866 8.143 8.766 8.545 8.491 8.474 8.555 8.499 7500 8.887 33.438 12.38 8.839 8.882 9.2 8.211 8.442 9.074 8.851 8.794 8.778 8.866 8.809 8000 9.161 32.543 11.3 9.116 9.159 9.481 8.524 8.708 9.349 9.123 9.063 9.05 9.142 9.085 8500 9.405 31.648 10.34 9.364 9.408 9.732 8.808 8.947 9.594 9.367 9.305 9.293 9.391 9.333 9000 9.625 30.761 9.49 9.586 9.631 9.956 9.066 9.161 9.815 9.586 9.521 9.511 9.614 9.554 9500 9.822 29.891 8.74 9.787 9.831 10.159 9.301 9.354 10.012 9.782 9.716 9.706 9.814 9.754 10000 9.999 29.041 8.07 9.967 10.012 10.341 9.516 9.527 10.19 9.96 9.891 9.882 9.995 9.934 11000 10.304 27.422 6.92 10.277 10.323 10.654 9.891 9.825 10.495 10.264 10.191 10.185 10.306 10.244 12000 10.554 25.913 6 10.533 10.579 10.912 10.205 10.069 10.746 10.513 10.438 10.435 10.562 10.499 13000 10.762 24.521 5.24 10.745 10.791 11.126 10.47 10.271 10.954 10.72 10.642 10.641 10.774 10.709 14000 10.936 23.238 4.61 10.923 10.968 11.304 10.696 10.441 11.128 10.892 10.813 10.813 10.951 10.887 15000 11.082 22.060 4.09 11.072 11.118 11.455 10.888 10.583 11.274 11.038 10.956 10.958 11.101 11.035 Values are based on db + or - depending on Pre or De Emphasis respectivily. Group Delay (us) was calculated using the phase shift at each frequency. "GDT us"=Period*(Deg.@f/360) where Period=1/Freq. & f=Freq. This does not match what is specified in the Canada specs though. De-Emphasis Circuit For MC13028 ~~~~~~~~~~~~~~~~~~~ 12K In 0--/\/\/\/--*---0 Out Pin 15(16) 0---*----------*---0 L(R) Out | | | | | | \ / / / \ \ 3.9 \ 5.6K / / 1.8K K / .0047 \ \ \ uf / .01uf / | | | | || | || | +-----||-----# Ground *----||----+ || | || | # Low Impedance Source Ground High Impedance Source © 2001 J. S. Gilstrap amstereo@jsgil.mylinuxisp.com