Quectel GPRS Series, Руководство по аудиодизайну

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GSM/GPRS Modules
GSM Module Audio Design Guide
GSM Module Audo Design Guide Confidential/Release 6 / 35
Figure Index
FIGURE 1 ： MICROPHONE REFERENCE CIRCUIT FOR AIN1&AIN2 ........................................................... 10
FIGURE 2: RECEIVER REFERENCE CIRCUIT FOR AOUT1 .......................................................................... 11
FIGURE 3: RECEIVER REFERENCE CIRCUIT WITH AUDIO POWER AMPLIFIER FOR AOUT1 ................. 11
FIGURE 4
：
SPK REFERENCE CIRCUIT FOR AOUT2 ................................................................................... 12
FIGURE 5
：
RECEIVER REFERENCE CIRCUIT WITH AUDIO POWER AMPLIFIER FOR AOUT2 .............. 12
FIGURE 6 ： HEADSET REFERENCE CIRCUIT............................................................................................... 13
FIGURE 7
：
MICROPHONE REFERENCE CIRCUIT FOR AIN1&AIN2 ........................................................... 13
FIGURE 8 ： RECEIVER REFERENCE CIRCUIT FOR AOUT1 ........................................................................ 14
FIGURE 9
：
HEADSET REFERENCE CIRCUIT............................................................................................... 14
FIGURE 10
：
SPK REFERENCE CIRCUIT ...................................................................................................... 15
FIGURE 11
：
MICROPHONE REFERENCE CIRCUIT FOR AIN1&AIN2 ......................................................... 16
FIGURE 12
：
RECEIVER REFERENCE CIRCUIT FOR AOUT1 ...................................................................... 16
FIGURE 13 ： SPK REFERENCE CIRCUIT FOR AOUT2 ................................................................................. 17
FIGURE 14
：
SPK REFERENCE CIRCUIT WITH AUDIO POWER AMPLIFIER FOR AOUT2 ........................ 17
FIGURE 15
：
HEADSET REFERENCE CIRCUIT............................................................................................. 18
FIGURE 16
：
SPK REFERENCE CIRCUIT ...................................................................................................... 18
FIGURE 17
：
HANDS-FREE REFERENCE CIRCUIT AT CHANNEL AIN1/AOUT1 ......................................... 20
FIGURE 18 ： LAYOUT OF AUDIO .................................................................................................................... 21
FIGURE 19
：
FIVE ECHO PATHS ..................................................................................................................... 22
FIGURE 20
：
MICROPHONE SOCKET DESIGN ............................................................................................. 23
FIGURE 22
：
SPK FREQUENCY RESPONSE................................................................................................. 25
FIGURE 23
：
SPK THD ..................................................................................................................................... 26
Quectel
Confidential