TDA7541B Datasheet, PDF (72/77 Pages) STMicroelectronics – AM/FM car radio tuner IC with stereo decoder and intelligent selectivity system

Appendix
Figure 12. Block diagram stereo decoder
MPXOUT MPXIN
TDA7541B
L
R
MUX
MPTC FSTC
Figure 13. Block diagram audio noise blanker
MPXIN
FMDEMOut
Deviation
detector
NBDC
140kHz HPF
(2nd. order)
Rectifier
FMON
FMON
VTH _Threshold
generator
NBCT NBLT
Integrator
discharge control
NBMP NBPC
NBSMP NBRR
Fieldstrenght
adjust
NBFC
Stereo
decoder
S&H NBENA
Monoflop
FM:22-40µs
AM:0.3-1.2ms
MPTC
L/R
FSTC
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Doc ID 16048 Rev 1