BC127 as A2DP source - connected headset receives only Mono audio

1

Hello,
Can any one tell me if the BC127 supports sending STEREO audio from the (stereo) microphone input (I’m using the BC127 dev board), and sending that via A2DP to a bluetooth headset. The input to the BC127 dev board is an iPhone.

Currently I only receive Mono audio.

Here’s my current config:
config
AUDIO=0 0
AUDIO_ANALOG=15 15 0 OFF
AUDIO_DIGITAL=0 44100 64 100A00 OFF
AUTOCONN=1
AUTO_DATA=OFF OFF
BALANCE=100 100
BATT_CONFIG=OFF 145 4250 1500 150
BC_SMART_CONFIG=68E3 28F0 89F7 D93C
BEACON_DATA=0 00 11 22 33 44 55 66 77 88 99 AA BB CC DD EE FF 04 D2 16 2E EE
BLE_CONFIG=0 OFF 80 ON
BLE_CONN_PARAMS=128 12 24 40 0 400 100 400 400 64 400 400
BT_STATE_CONFIG=0 0
BT_VOL_CONFIG=A 60 10 1
CLASS_1=OFF
CMD_TO=20
COD=240404
CODEC=0 OFF
DEEP_SLEEP=OFF
DEVICE_ID=0001 0002 0003 0004 0005 0006 0007 0008
ENABLE_BATT_IND=ON
ENABLE_LED=ON
ENABLE_SPP_SNIFF=OFF 0 0 0 0 0
GPIO_CONFIG=ON 0
HFP_CONFIG=OFF ON OFF OFF OFF OFF
HIGH_SPEED=OFF OFF
LOCAL_ADDR=20FABB0A392F 000000000000
MAX_REC=2
MM=OFF OFF 0 OFF OFF OFF OFF OFF
MUSIC_META_DATA=OFF
MUSIC_OLD_AVRCP=OFF
NAME=BC-0A392F
NAME_SHORT=BC0A392F
PIN=0000
PROFILES=1 1 0 1 1 0 0 0 0 0 0 0
REMOTE_ADDR=000000000000
SPP_UUID=00 00 11 01 00 00 10 00 80 00 00 80 5F 9B 34 FB
SSP_CAPS=3
TWS_CONFIG=OFF 1 2
UART_CONFIG=9600 OFF 0
USB_HOST=OFF
VREG_ROLE=1
OK

And version is 7.3
Sierra Wireless Copyright 2018
Melody Audio V7.3
Build: 1544637564
Ready

2

Hi 611nwllc

According to Melody Audio 7.x User Guide r3.pdf
Additional A2DP features include True Wireless Stereo (TWS), Dual Stream, and Talkback.

True Wireless Stereo (TWS)
Melody 7.x includes True Wireless Stereo (TWS) support with SBC or aptX codecs. TWS allows two modules to connect to each other and share audio that is streamed to one of them (A2DP Source, or analog input). Each module can be configured for Left, Right, or Stereo channels using the TWS_CONFIG configuration. The True Wireless Stereo feature allows the use case for TWS speakers over Bluetooth.

Please use TWS_CONFIG= ON 0 0 command to enable TWS auto-connect when the A2DP source connects

Please refer to page 112 in Melody Audio 7.x User Guide r3.pdf for more details.
https://source.sierrawireless.com/resources/airprime/hardware_specs_user_guides/bc127-melody-audio-7-user-guide/#sthash.BPbKDbt6.dpbs

1 Like
3

Hello Donald,
I was able to resolve the issue - when connection “line-in” audio to the development board (in my case from an iphone) the MIC BIAS must be turned on or else the audio sent over the A2DP link sounds like Mono. I thank you for your time.

1 Like