Motorola 8900 User Manual - Page 59

Chapter 2: Hardware Interface Description Gain Control The amplification (gain) level for each input and output device can be configured through AT commands. Both basic and advanced audio modes provide AT commands to set the desired gain levels for each audio path and audio sound type. Table 2-13 gives the gain control features. Device Microphone Headset Microphone Speaker Alert Speaker Table 2-13: Gain Control Features Gain Command Default Gain Description Basic AT+MMICG Advanced 16 AT+MMICG 16 Sets input speech gain level. Sets input speech gain level. AT+CLVL AT+CRSL 4 AT+MAVOL 4 Sets voice and DTMF gain. Sets rings and alerts gain. Gain levels for the input and output devices, which correspond to the values set by the AT commands, are described in Table 2-14 and Table 2-15. Table 2-14: Speaker Port Gains for Speech AT Command Value 0 1 2 3 4 5 6 7 Gain Level (dB) -9 -6 -3 0 3 6 9 12 0dBm0 Output Level (mVRMS) 13 19 26.5 37.5 53 75 120 168 December 15, 2008 C24 Module Hardware Description 35