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STR 631 /STR 632
1. Audio Path
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Audio Demodulator Block Diagram
Audio Processing Block Diagram
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FM Demodulator
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1.1 Noise Reduction System (NRS)
$3 is used to select the NRS system.
1.2 Passive Deemphasis
Port 0
Bits O.and 1 are used for detection of the voltage on pin 8 of the AUX
2 and AUX 1 SCARTs respectively. These two port bits are analogue
to digital converter inputs which measure the pin 8 voltage and can
thus sense if 4:3 or 16:9 operation is. being requested on those
models with this facility.
Port1
:
Bit 0 is the IR input. This is configured as an interrupt and is active
LOW.
Port 2
Bits 0 and 1 are the SDA (data) and SCL (clock) of the main 12C bus
used to control the Tuner, 1C400, the FS version of the modulator
MOD500, and the non-volatile memory (NVM) IC601. This bus is
also made available on PL602 and PL603 for future expansion of the
receiver capabilities.
Port 4
Bits 3 to.5 are a three wire serial bus for future expansion.
GRUNDIG Service
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