Good day!
I have troubles with audiocodec and Cinterion modem. I'm trying to communicate TLV320AIC1110 and Cinterion modem. Symptom data is the same as in previous occurrence (audio codec in LMX9838 and Cinterion modem) – so much noise.
What you can recommend to solve problem?
Letter from collegue is placed bellow (with my comments).
We need to communicate in half-duplex and full-duplex mode. Codec TLV320AIC 1110 can only provide half-duplex communication (communication quality 3 with minus points ).
We tried to change all that is possible in different combinations . We read data oscilloscope and decode the data and then reproduced on headphones. The result is no different from play through the module . So in the module nor any errors can be.
Settings TLV320AIC1110:
0 ) Address 00 = 0x9b; 1 ) Address 01 = 0x02; 0x01; 0x03; 0x04; 0x07; 0x90; 0x91; 0x92; 0x97; 0x20; 2 ) Address 02 = 0x00; 0x28; 0x40; 0x68; 0x01; 0x2E; 0x43; 0x6E; 3 ) Address 03 All ranges TP3-TP0; all ranges ST2-ST0 ( When Sidetone enable); 4 ) Address 04 does not change. 5 ) Address 05 does not change. 6 ) Address 06 We MCLK is set to 128kHz ( we submit to 0.01 %).
Put the detector and remove MCLK . No results . Receiver channel gain was set to 0 and 6dB .
When all settings loud noises over the microphone . It 's almost unheard of .
Settings in half-duplex mode:
reg00 = 0x9b reg01 = 0x10 reg02 = 0x00 reg03 = 0xa0 reg06 = 0x81
In general, changed all that is possible . Spent a total of 2 weeks to start and 2 times reroutes PCB and all to no avail .
I have great doubts on the filters description in the register 01 in standard documentation. A feeling that confused .
What can it be? How to grow up a sound quality(remove noise, overboost)?