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CAP3001A Datasheet(PDF) 11 Page - Micronas |
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CAP3001A Datasheet(HTML) 11 Page - Micronas |
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11 / 37 page  CAP 3001 A MICRONAS INTERMETALL 11 Fig. 2–10: Digital interpolation filter, passband characteristic 3 0 *3 0.0 5.0 10.0 15.0 20.0 22.05 kHz f dB gain Fig. 2–11: Digital interpolation filter, attenuation *50 0 *80 0.0 50 100 150 200 350 kHz 250 300 f dB gain 2.1.13.2. ARI Mixer ARIMX The ARI-information in the range of 57 kHz is mixed down to a zero intermediate frequency by the two ARI mixers, whose mixer signals are again in quadrature. The reason for using two paths is that the demodulation is asynchronous in general; in the DSP there should be an operation which performs the square root of the sum of the squares of the two input signals. The quality re- quirements of the square rooting should not be very high. Because of the phase lock of pilot tone and ARI carrier in the FM-stereo-mode, a synchronous demodu- lation seems to be possible; in this case the demodu- lated ARI signal would be identical with the signal of the inphase path. The chosen structure has another potential advantage, for processing the radio data system (RDS) in Europe. This signal is a part of the MPX-signal; its subcarrier fre- quency is the same as that of the ARI-signal but it is rec- ommended that the two subcarriers are in quadrature. So the two paths of the ARI demodulation subsystem make the information of the ARI-signal and of the RDS- signal available to the DSP, where both can be demodu- lated if desired. |
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