LG MG810c Service Manual page 35

3. H/W Circuit Description
Figure 21. Voice Downlink path Block Diagram
C. Baseband Codec(BBC)
Baseband codec is composed of baseband uplink path(BUL) and baseband downlink path(BDL).
BUL makes GMSK(Gaussian Minimum Shift Keying) modulated signal which has In-phase(I) com-
ponent and quadrature(Q) component with burst data from DBB. This modulated signal is transmitted
through RF section via air. BDL process is opposite procedure of BUL. Namely, it performs GMSK
demodulation with input analog I&Q signal from RF section, and then transmit it to DSP of DBB chip
with 270.833kHz data rate through BSP.
Figure 22. Baseband Codec Block Diagram
- 34 -