User's Manual
Table Of Contents
- Contents
- Table Index
- Figure Index
- 0. Revision history
- 1. Introduction
- 2. Product concept
- 3. Application interface
- 3.1. Pin of module
- 3.2. Operating modes
- 3.3. Power supply
- 3.4. Power on and down scenarios
- 3.5. Charge interface
- 3.6. Power saving
- 3.7. Summary of state transition
- 3.8. RTC backup
- 3.9. Serial interfaces
- 3.10. Audio interfaces
- 3.11. SIM card interface
- 3.12. SD card interface
- 3.13. PCM interface
- 3.14. ADC
- 3.15. Behaviors of the RI
- 3.16. Network status indication
- 3.17. Operating status indication
- 4. Antenna interface
- 5. Electrical, reliability and radio characteristics
- 6. Mechanical dimensions
- 7. Storage and manufacturing
- Appendix A: GPRS coding schemes
- Appendix B: GPRS multi-slot classes
M50 Hardware Design
M50_HD_V2.0 - 65 -
Table 23: QPCMON command description
Parameter scope Description
Mode 0~2 0: Close PCM
1: Open PCM
2: Open PCM when audio talk is set up
Sync_Type 0~1 0: Short synchronization
1: Long synchronization
Sync_Length 1~8 Programmed from one bit to eight bit
SignExtension 0~1 0: Zero padding
1: Sign extension
MSBFirst 0~1 0: MSB first
1: Not supported
“AT+QPCMVOL” can configure volume of input and output.
AT+QPCMVOL=vol_pcm_in,vol_pcm_out
Table 24: QPCMVOL command description
Parameter scope Description
vol_pcm_in 0~32767 Set the input volume
vol_pcm_out 0~32767 Set the output volume
The voice may be distorted when this
value exceeds 16384.
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