3. H/W Circuit Description
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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 21. Voice Downlink path Block Diagram
Figure 22. Baseband Codec Block Diagram
Содержание MG810c
Страница 1: ...Date May 2006 Issue 1 0 Service Manual MG810c MG810d Service Manual Model MG810c MG810d ...
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Страница 46: ...4 TROUBLE SHOOTING 45 WR CS ADSSSSS CS ADSSSSS WR ...
Страница 52: ...4 TROUBLE SHOOTING 51 G 1 Speaker Receiver Trouble Shooting Common Path ...
Страница 53: ...4 TROUBLE SHOOTING 52 G 2 Speaker Receiver Trouble Shooting Acoustic Path ...
Страница 54: ...4 TROUBLE SHOOTING 53 G 3 Speaker Receiver Trouble Shooting MP3 AAC Path ...
Страница 55: ...4 TROUBLE SHOOTING 54 G 4 Speaker Receiver Trouble Shooting FM Radio Path ...
Страница 56: ...4 TROUBLE SHOOTING 55 G 5 Main Mic Path Trouble Shooting ...
Страница 57: ...4 TROUBLE SHOOTING 56 G 6 Ear Mic Receiver Path Trouble Shooting ...
Страница 58: ...4 TROUBLE SHOOTING 57 G 7 Ear Mic Mic Path Trouble Shooting ...
Страница 59: ...4 TROUBLE SHOOTING 58 G 8 Vibrator Trouble Shooting ...
Страница 60: ...4 TROUBLE SHOOTING 59 4 2 RF Part Troubleshooting A RF Receiving Path Trouble Shooting ...
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