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UMTS/HSPA Module Series

WCDMA UGxx Audio Design Note

WCDMA_UGxx_Audio_Design_Note Confidential / Released 25 / 56

AT+QAUDGAIN=2,100,60

//If downlink or uplink volume is a litter lower or higher,

please use AT+QAUDGAIN to tune it.

OK

AT+QSIDET=-450

//Tune side tone

OK

Quectel

Confidential

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Summary of Contents for WCDMA UG Series

Page 1: ...WCDMA UGxx Audio Design Note UMTS HSPA Module Series Rev WCDMA_UGxx_Audio_Design_Note_V1 2 Date 2015 12 21 www quectel com ...

Page 2: ...NFORMATION PROVIDED IS BASED UPON CUSTOMERS REQUIREMENTS QUECTEL MAKES EVERY EFFORT TO ENSURE THE QUALITY OF THE INFORMATION IT MAKES AVAILABLE QUECTEL DOES NOT MAKE ANY WARRANTY AS TO THE INFORMATION CONTAINED HEREIN AND DOES NOT ACCEPT ANY LIABILITY FOR ANY INJURY LOSS OR DAMAGE OF ANY KIND INCURRED BY USE OF OR RELIANCE UPON THE INFORMATION ALL INFORMATION SUPPLIED HEREIN IS SUBJECT TO CHANGE W...

Page 3: ...l Released 2 56 About the Document History Revision Date Author Description 1 0 2015 9 7 Felix YIN Jun WU Initial 1 1 2015 10 23 Felix YIN 1 Updated PCM information in Chapter 2 2 Updated data_length value for AT QDAC 1 2 2015 12 21 Felix YIN Updated PCM timing in Chapter 2 Quectel Confidential ...

Page 4: ...udio Layout 17 4 3 TDD Noise 18 4 4 Mechanical Design 18 4 5 Component of SPK 20 4 6 Components of Microphone 22 5 Audio Tuning in Different Modes 23 5 1 Speech Call in Handset Mode 23 5 2 Speech Call in Headset Mode 24 5 3 Speech Call in Handfree Mode 24 6 Audio AT Command Description 26 6 1 AT QDAC Digital Audio Interface Configuration 26 6 2 AT QIIC IIC Read Write 28 6 3 AT CLVL Loud Speaker Vo...

Page 5: ...et Down Link Noise Reduction for Headset 45 6 14 7 AT QAUDCFG headset nr ul Set Uplink Noise Reduction for Headset 46 6 14 8 AT QAUDCFG handfree nr dl Set Down Link Noise Reduction for Handfree 47 6 14 9 AT QAUDCFG handfree nr ul Set Uplink Noise Reduction for Handfree 48 6 14 10 AT QAUDCFG nau8814 dlgain Set Down Link Gain Level for Codec nau8814 49 6 14 11 AT QAUDCFG nau8814 ulgain Set Uplink Ga...

Page 6: ... UGxx Audio Design Note WCDMA_UGxx_Audio_Design_Note Confidential Released 5 56 Table Index TABLE 1 PIN DEFINITION 8 TABLE 2 IO CHARACTERISTICS 8 TABLE 3 RELATED DOCUMENTS 56 TABLE 4 TERMS AND ABBREVIATIONS 56 Quectel Confidential ...

Page 7: ...IGURE 3 ALC5616 CODEC DESIGN 12 FIGURE 4 NAU8814 CODEC DESIGN 13 FIGURE 5 MAX9860 CODEC DESIGN 14 FIGURE 6 MICROPHONE DESIGN 15 FIGURE 7 RECEIVER DESIGN 15 FIGURE 8 EARPHONE DESIGN 16 FIGURE 9 SPEAKER AMPLIFIER DESIGN 16 FIGURE 10 AUDIO LAYOUT 17 FIGURE 11 FIVE ECHO PATHS 19 FIGURE 12 MICROPHONE SOCKET DESIGN 19 FIGURE 13 SPEAKER SOCKET DESIGN 20 FIGURE 14 SPK FREQUENCY RESPONSE 21 FIGURE 15 SPK T...

Page 8: ...A UGxx Audio Design Note WCDMA_UGxx_Audio_Design_Note Confidential Released 7 56 1 Introduction This document mainly introduces how to use Pulse Code Modulation PCM digital interface with Quectel UGxx modules Quectel Confidential ...

Page 9: ... 0 Refer to document 3 for more details Supports master and slave mode Supports audio sample rate 8 kHz The following table shows the pin definition of PCM and I2C interface Table 1 Pin Definition Table 2 IO Characteristics Pin Name I O Description PCM_IN DI PCM data input PCM_OUT DO PCM data output PCM_SYNC DO PCM data frame sync signal PCM_CLK DO PCM data bit clock I2C_SCL OD I2C serial clock I2...

Page 10: ...d bit 1 clock pulses The firmware of module has integrated the configuration on NAU8814 ALC5616 MAX9860 application with I2C interface AT QDAC command can be used to configure the external codec chip linked with PCM interface and refer to document 3 for more details Data bit is 32 bit and the sampling rate is 8 KHz The following figure shows the timing of the application with ALC5616 codec PCM_CLK...

Page 11: ... not mounted When the MCLK is provided by peripheral R2 is mounted and R1 is not mounted 3 It is recommended to reserve RC R 22Ω C 22pF circuit on the PCM lines especially for PCM_CLK 4 UGxx modules provide a digital clock output CLK_OUT for an external audio codec the CLK_OUT function is disabled by default When CLK_OUT is required AT command is used to provide the codec with a 13 26MHz clock gen...

Page 12: ...M application Pin25 provides a clock ranges from 32k to 26M This clock can be used to provide MCLK for codec When ALC5616 NAU8814 or MAX9860 is using Pin25 will output a 26M clock by default AT QPCMCLK is used to enable this clock AT QCLKOUT 1 2 Output 26M frequency OK AT QCLKOUT 0 Close output OK The following chapters will show the audio design circuit with these codec Quectel Confidential ...

Page 13: ...ith ALC5616 from Realtek http www realtek com tw and I2C interface is equipped to configure codec Figure 3 ALC5616 Codec Design 1 The RC filter circuit R 22ohm C 22pF needs to be installed on PCM_CLK line 2 VDD_3V3 and VDD_1V8 are needed to be supplied externally 3 Set AT QDAC 3 to choose ALC5616 MCLK is not needed and ALC5616 uses internal PLL to generate system clock NOTES Quectel Confidential ...

Page 14: ...on com and I2C interface is equipped to configure codec Figure 4 NAU8814 Codec Design 1 The RC filter circuit R 22ohm C 22pF needs to be installed on PCM_CLK line 2 VDD_3V3 is needed to be supplied externally 3 Set AT QDAC 2 to choose NAU8814 please provide 2M external crystal for NAU8814 The CLOCK_OUT pin can also provide 26M clock for NAU8814 but the quality of the voice is worse than 2M externa...

Page 15: ...0 The following figure shows PCM application with MAX9860 from Maxim http www maxim ic com and I2C interface is equipped to configure codec Figure 5 MAX9860 Codec Design 1 The RC filter circuit R 22ohm C 22pF needs to be installed on PCM_CLK line 2 Set AT QDAC 4 to choose MAX9860 the module will provide 26M MCLK by default NOTES Quectel Confidential ...

Page 16: ...nterface Design Close to Microphone MICP_PCM MICN_PCM Differential layout Electret Microphone 10pF 10pF 10pF 33pF 33pF 33pF 0R 0R Figure 6 Microphone Design 3 5 Receiver Interface Design Close to Receiver SPKP_PCM SPKN_PCM 10pF 10pF 10pF 33pF 33pF 33pF 32Ω Differential layout 0R 0R Figure 7 Receiver Design Quectel Confidential ...

Page 17: ...hone design 1 2 4 3 SPKP_PCM MICN_PCM MICP_PCM 22uF Close to Socket Differential layout 4 7uF 33pF 10pF 33pF 10pF Earphone 32Ω 0R 0R Figure 8 Earphone Design 3 7 Speaker Amplifier Design If the 8Ω speaker is applied it is recommended to add an audio amplifier Close to Speaker SPKP_PCM SPKN_PCM 10pF 10pF 10pF 33pF 33pF 33pF Ri Ri Amplifier circuit 8Ω Figure 9 Speaker Amplifier Design Quectel Confid...

Page 18: ...cated LDO and not to share this power with other circuits 4 2 Audio Layout Power supply ripple unbalanced ground and RF burst radiation have negative effect on audio layout Layout of MICP_PCM MICN_PCM SPKP_PCM SPKN_PCM must meet the rule of differential signal Moreover these two pairs of signals should be separated from each other by flooding ground to avoid echo issue from SPK signal to MIC signa...

Page 19: ... the power supply in audio circuits A wide layout is used from power source like adapter interface battery connector or LDO output pin to audio power supply Good antenna matching is also important to reduce power ripple 5 The filtering capacitors and ESD protection devices should be connected to main digital ground Separate analog ground and digital ground and connect them at a single point on the...

Page 20: ...ential factors Other three factors vibrations through casework vibrations through PCB distant echoes are secondary To deal with echo issue from internal air path you can separate microphone from internal space of chassis by foam or rubber ring which can effectively suppress the inner echo interference Figure 12 shows recommended design for microphone socket Figure 12 Microphone Socket Design Quect...

Page 21: ...nt for good voice quality A sealed rear cavity with sufficient space could produce a good voice output An 8Ω speaker is often big and difficult to give an independently sealed rear cavity for it However sealing microphone socket in chassis is always useful Furthermore the whole chassis must be sealed as far as possible If there is any unavoidable leak hole keep it far away from microphone If the l...

Page 22: ... UGxx Audio Design Note WCDMA_UGxx_Audio_Design_Note Confidential Released 21 56 Figure 14 SPK Frequency Response Horizontal axis is frequency longitudinal axis is loudness and unit is dB Figure 15 SPK THD NOTE Quectel Confidential ...

Page 23: ...n the green one performs the best and the blue one is worse and the red one is the worst 4 6 Components of Microphone It is recommended to use an electret microphone with a sensitivity of 42 3dB Pa 2V not less than 44 3dB and impedance of 2 2Kohm If RF TDD noise is detected at the MIC please contact MIC vendor for product with better RF suppression capability Furthermore the microphone channel cir...

Page 24: ...C to tune uplink volume Step 3 If the volume is a little smaller or higher and you have set QMIC CLVL please use AT QAUDGAIN to tune it Step 4 If you use the recommended codec you can use AT QAUDCFG to tune the codec volume Step 5 Execute AT QSIDET to tune side tone Step 6 If there is echo or noise left please use AT QAUDCFG to tune EEC NR Please do not set the volume too high otherwise it will in...

Page 25: ...AT QAUDMOD 1 mode 1 is used for headset mode OK AT CLVL 70 Tune downlink volume OK AT QMIC 1 14 Tune uplink volume OK AT QAUDGAIN 1 60 1 If downlink or uplink volume is a litter lower or higher please use AT QAUDGAIN to tune it OK AT QSIDET 100 Tune side tone OK 5 3 Speech Call in Handfree Mode Set AT QAUDMOD 2 to use Headset mode This mode is always used for vehicle mounted devices AT QAUDMOD 2 m...

Page 26: ...io Design Note WCDMA_UGxx_Audio_Design_Note Confidential Released 25 56 AT QAUDGAIN 2 100 60 If downlink or uplink volume is a litter lower or higher please use AT QAUDGAIN to tune it OK AT QSIDET 450 Tune side tone OK Quectel Confidential ...

Page 27: ...irectly and set by the default configurations while io 3 and the external codec chip linked with PCM interface is the ALC5616 model through the I2C the module can be used directly and set by the default configurations while io 4 and the external codec chip linked with PCM interface is the MAX9860 model through the I2C the module can be used directly and set by the default configurations AT QDAC Di...

Page 28: ...e AT QDAC Query the range QDAC 1 4 0 1 0 8 0 2 0 1 0 1 OK AT QDAC Query current interface configuration QDAC 1 0 0 2 0 0 OK AT QDAC 1 0 0 2 0 0 Set PCM interface to master mode PCM format OK AT QDAC 2 Select NAU8814 io 1 Digital PCM output customer defined 2 Analog output for default audio codec NAU8814 3 Analog output for default audio codec ALC5616 4 Analog output for default audio codec MAX9860...

Page 29: ...odec via I2C interface Parameter Configuration will be not saved AT QIIC IIC Read Write Test command AT QIIC Response QIIC 0 1 0 FF 0 FF 1 2 0 FFFF OK Set command AT QIIC rw device addr byt es value Response OK Response QIIC value OK Maximum Response Time 300ms rw 0 Write command 1 Read command device 0 0xFF Device address addr 0 0xFF Register address bytes 1 2 Read write bytes value 0 0xFFFF Data...

Page 30: ...LVL Loud Speaker Volume Level Test Command AT CLVL Response CLVL list of supported level s OK Read Command AT CLVL Response CLVL level OK Write Command AT CLVL level Response OK If error is related to ME functionality CME ERROR err Maximum Response Time 300ms Reference 3GPP TS 27 007 level Integer type value 0 100 with manufacturer specific range Smallest value represents the lowest sound level th...

Page 31: ...de ul_gain_offset dl_gain_offset OK If configuration parameters are entered OK ERROR Maximum Response Time 300ms mode Numeric type audio mode 0 Handset 1 Headset 2 Handfree ul_gain_offset Numeric type value 600 300 indicates uplink gain offset Default value of mode 0 is 1 the default value of mode 1 is 60 and the default value of mode 2 is 100 dl_gain_offset Numeric type value 600 300 indicates do...

Page 32: ... volume headset volume handfreevolume OK Set Command AT QMIC mode volume Response OK ERROR Maximum Response Time 300ms mode Numeric type audio mode 0 Handset 1 Headset 2 Handfree volume Numeric type indicates uplink volume range 0 15 the default value of mode 0 is 12 the default value of mode 1 is 14 and the default value of mode 2 is 13 AT CMUT Mute Control Test Command AT CMUT Response CMUT 0 1 ...

Page 33: ...clock source from pin25 If error is related to ME functionality CME ERROR err Maximum Response Time 300ms Reference 3GPP TS 27 007 n 0 Mute off 1 Mute on AT QCLKOUT Output Clock Source Test Command AT QCLKOUT Response QCLKOUT 0 1 1 4 OK Read Command AT QCLKOUT Response QCLKOUT enable source OK CME ERROR err Write Command AT QCLKOUT enable source Response OK ERROR Maximum Response Time 300ms NOTE Q...

Page 34: ...able to output clock source 1 Enable to output clock source source 1 26MHz 2 13MHz 3 6 5MHz 4 32 768KHz AT QSIDET Set the Side Tone Gain in Current Mode Test Command AT QSIDET Response QSIDET 450 200 OK Read Command AT QSIDET Response QSIDET stgain OK Write Command AT QSIDET stgain Response OK ERROR Maximum Response Time 300ms stgain Numeric type indicates the configured side tone gain in current ...

Page 35: ...t Parameter These parameters will not be saved AT QAUDLOOP Enable Audio Loop Test Test Command AT QAUDLOOP Response QAUDLOOP 0 1 0 2 OK Read Command AT QAUDLOOP Response QAUDLOOP enable path OK Set Command AT QAUDLOOP enable path Response OK ERROR Maximum Response Time 300ms enable Numeric type to enable or disable audio loop test 0 Disable audio loop test 1 Enable audio loop test path Compatible ...

Page 36: ...OK Read command AT QAUDMOD Response QAUDMOD mode OK Write Command AT QAUDMOD mode Response OK If error is related to ME functionality CME ERROR err Maximum Response Time 300ms mode Numeric type indicates the current configured audio mode 0 Echo canceller noise suppressor digital gain and calibration parameter for Handset 1 Echo canceller noise suppressor digital gain and calibration parameter for ...

Page 37: ...nse CRSL level OK Write Command AT CRSL level Response OK ERROR Maximum Response Time 300ms level Numeric type indicates the configured volume of ring tone Range 0 100 the default value of mode 0 is 80 the default value of mode 1 is 50 and the default value of mode 2 is 80 AT CALM Mute the Ring Tone Test Command AT CALM Response CALM list of supported n s OK Read Command AT CALM Response CALM n OK...

Page 38: ... PCM sync BCLK Parameter This parameter will not be saved n Numeric type 0 Ring tone is normal 1 Ring tone is mute AT QPCMON Enable PCM Sync BCLK Test Command AT QPCMON Response QPCMON list of supported n s OK Read Command AT QPCMON Response QPCMON n OK Write Command AT QPCMON n Response OK ERROR Maximum Response Time 300ms n Numeric type 0 Disable PCM sync BCLK 1 Enable PCM sync BCLK NOTE NOTE Qu...

Page 39: ...c list of supported eecpara s QAUDCFG handfree eec list of supported eecpara s QAUDCFG handset nr ul list of supported nrpara s QAUDCFG headset nr ul list of supported nrpara s QAUDCFG handfree nr ul list of supported nrpara s QAUDCFG handset nr dl list of supported nrpara s QAUDCFG headset nr dl list of supported nrpara s QAUDCFG handfree nr dl list of supported nrpara s QAUDCFG nau8814 dlgain QA...

Page 40: ...er of taps in complex subband3 range 1 528 Default value might be different in different audio modes Par6 EC_NrCoeffs_Complex_4 Number of taps in complex subband4 range 1 528 Default value might be different in different audio modes Par7 EC_NrCoeffs_Complex_5 Number of taps in complex subband5 range 1 528 Default value might be different in different audio modes Par8 EC_Blen NLMS update block leng...

Page 41: ...E_TriggerOffset AGC trigger offset for the decision logic to allow more double talk range 16384 16384 Default value might be different in different audio modes Par20 RE_FarPowerCenter Threshold on far end power below which overestimation is Par22 above which estimationisPar23 range 0 16384 Default value might be different in different audio modes Par21 RE_FarPowerDistorted Threshold on far end ove...

Page 42: ...ample AT QAUDCFG headset eec 1 1 100 100 100 1 1 1 2 1 32113 16384 2560 4096 1 0 0 5000 0 0 512 0 12288 256 282 307 1 0 Set configuration to default OK AT QCFG headset eec Query AT QAUDCFG headset eec Set Echo Cancellation for Headset Test Command AT QAUDCFG Response QAUDCFG headset eec eecpara OK Write Command AT QAUDCFG headset eec eecpara Response If configuration parameters are omitted QAUDCFG...

Page 43: ... 1800 80 8192 0 0 6144 12288 256 282 307 1 0 Set configuration to default OK AT QCFG handfree eec Query QAUDCFG handfree eec 1 1 150 150 150 1 1 1 2 1 32113 16384 10240 16384 1 1800 80 8192 0 0 6144 12288 256 282 307 1 0 OK AT QAUDCFG handfree eec Set Echo Cancellation for Headfree Test Command AT QAUDCFG Response QAUDCFG handfree eec eecpara OK Write Command AT QAUDCFG handfree eec eecpara Respon...

Page 44: ...nrpara List of integers separated by dot Par0 Noise Reduction control word 1 enable 0 disable Default value might be different in different audio modes Par1 NR_AttenFactorMinVal Minimum value of Noise Reduction gain range 0 32767 Default value might be different in different audio modes Par2 NR_OvEstFacBandZero Overestimation factor for Noise Reduction in band 0 range 0 32767 Default value might b...

Page 45: ...dl is used to set down link noise reduction for handset Parameter Auto save the configuration to NV The setting is still valid after module restart AT QCFG handset nr dl Set Down Link Noise Reduction for Handset Test Command AT QAUDCFG Response QAUDCFG handset nr dl nrpara OK Write Command AT QAUDCFG handset nr dl nrpara Response If configuration parameters are omitted QAUDCFG handset nr dl nrpara...

Page 46: ... nr dl is used to set down link noise reduction for headset Parameter Auto save the configuration to NV The setting is still valid after module restart AT QCFG headset nr dl Set Down Link Noise Reduction for Headset Test Command AT QAUDCFG Response QAUDCFG headset nr dl nrpara OK Write Command AT QAUDCFG headset nr dl nrpara Response If configuration parameters are omitted QAUDCFG headset nr dl nr...

Page 47: ...et nr ul is used to set uplink noise reduction for headset Parameter Auto save the configuration to NV The setting is still valid after module restart AT QCFG headset nr ul Set Uplink Noise Reduction for Headset Test Command AT QAUDCFG Response QAUDCFG headset nr ul nrpara OK Write Command AT QAUDCFG headset nr ul nrpara Response If configuration parameters are omitted QAUDCFG headset nr ul nrpara...

Page 48: ... dl is used to set down link noise reduction for handfree Parameter Auto save the configuration to NV The setting is still valid after module restart AT QCFG handfree nr dl Set Down Link Noise Reduction for Handfree Test Command AT QAUDCFG Response QAUDCFG handfree nr dl nrpara OK Write Command AT QAUDCFG handfree nr dl nrpara Response If configuration parameters are omitted QAUDCFG handfree nr dl...

Page 49: ...dfree nr ul is used to set uplink reduction for handfree Parameter Auto save the configuration to NV The setting is still valid after module restart AT QCFG handfree nr ul Set Uplink Noise Reduction for Handfree Test Command AT QAUDCFG Response QAUDCFG handfree nr ul nrpara OK Write Command AT QAUDCFG handfree nr ul nrpara Response If configuration parameters are omitted QAUDCFG handfree nr ul nrp...

Page 50: ...dlgain is used to set down link gain level for codec nau8814 Parameter AT QAUDCFG nau8814 dlgain Set Down Link Gain Level for Codec nau8814 Test Command AT QAUDCFG Response QAUDCFG nau8814 dlgain level OK Write Command AT QAUDCFG nau8814 dlgain level Response If configuration parameters are omitted QAUDCFG nau8814 dlgain Return current configuration QAUDCFG nau8814 dlgain level OK If configuration...

Page 51: ...r codec nau8814 Parameter AT QAUDCFG nau8814 ulgain Set Uplink Gain Level for Codec nau8814 Test Command AT QAUDCFG Response QAUDCFG nau8814 ulgain level OK Write Command AT QAUDCFG nau8814 ulgain level Response If configuration parameters are omitted QAUDCFG nau8814 ulgain Return current configuration QAUDCFG nau8814 ulgain level OK If configuration parameters are entered OK ERROR If error is rel...

Page 52: ... codec alc5616 Parameter AT QAUDCFG alc5616 dlgain Set Down Link Gain Level for Codec alc5616 Test Command AT QAUDCFG Response QAUDCFG alc5616 dlgain level OK Write Command AT QAUDCFG alc5616 dlgain level Response If configuration parameters are omitted QAUDCFG alc5616 dlgain Return current configuration QAUDCFG alc5616 dlgain level OK If configuration parameters are entered OK ERROR If error is r...

Page 53: ...r codec alc5616 Parameter AT QAUDCFG alc5616 ulgain Set Uplink Gain Level for Codec alc5616 Test Command AT QAUDCFG Response QAUDCFG alc5616 ulgain level OK Write Command AT QAUDCFG alc5616 ulgain level Response If configuration parameters are omitted QAUDCFG alc5616 ulgain Return current configuration QAUDCFG alc5616 ulgain level OK If configuration parameters are entered OK ERROR If error is rel...

Page 54: ... codec max9860 Parameter AT QAUDCFG max9860 dlgain Set Down Link Gain Level for Codec max9860 Test Command AT QAUDCFG Response QAUDCFG max9860 dlgain level OK Write Command AT QAUDCFG max9860 dlgain level Response If configuration parameters are omitted QAUDCFG max9860 dlgain Return current configuration QAUDCFG max9860 dlgain level OK If configuration parameters are entered OK ERROR If error is r...

Page 55: ...r codec max9860 Parameter AT QAUDCFG max9860 ulgain Set Uplink Gain Level for Codec max9860 Test Command AT QAUDCFG Response QAUDCFG max9860 ulgain level OK Write Command AT QAUDCFG max9860 ulgain level Response If configuration parameters are omitted QAUDCFG max9860 ulgain Return current configuration QAUDCFG max9860 ulgain level OK If configuration parameters are entered OK ERROR If error is rel...

Page 56: ...sed 55 56 This parameter will not be saved Example AT QAUDCFG max9860 ulgain 85 Set uplink gain to 85 OK AUDCFG handset nr dl 1 12000 10000 10000 1000 19660 Set configuration to default OK AT QAUDCFG handset nr dl Query QAUDCFG handset nr dl 1 12000 10000 10000 1000 19660 OK NOTE Quectel Confidential ...

Page 57: ...ns SN Document name Remark 1 Quectel_UGxx_Hardware_Design UG95 and UG96 Hardware Design 2 Quectel_UGxx_Reference_Design UG95 and UG96 Reference Design 3 Quectel_WCDMA_UGxx_AT_Commands_ Manual UGxx AT Commands Manual Abbreviation Description LDO Low Dropout Regulator ME Mobile Equipment UG95 and UG96 Module NV Non Volatile Memory PCM Pulse code Modulation Quectel Confidential ...

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