IDC777 unicast UTXV sampling rate

[abdo]

Hello everyone,

I am working with two IDC777,
I established unicast voice LE connection since I need a bidirectional audio stream(is this my only option?),
But I noticed that the sampling rate is 32K, but I couldn’t change it even after using UCAST_CONFIG,

Is there anyway to increase the sampling rate to 48K on a bidirectional audio stream between 2 IDC’s?

Thank you,
Abdo

[IOT747 Team]

Hello Abdo,

For bidirection links, you for now have 2 options:

1) Classic Bluetooth: AGHFP and HFP: This will give you a 16kHz mSBC encoded stream. Latency is about 50ms.

2) LE Audio: In this one, you can choose the sampling rate. However, this was only tested up to 32Khz. I don’t think 48k is supported by the standard,

Can you file a ticket at https://www.iot747.com/support/open.php about this? This will allow it to be added to feature requests.

Also, there is one option, the gaming mode. In this option, you get a 48k (out) and a 16k (in) connection. Search gaming in the UART command manual.

IOT747 Support

[abdo]

Hello again,

Thank you for your reply,

I am trying the gaming mode but wasn’t able to make it work,
On the initiator:
config
AUDIO=0 0
AUDIO_ANALOG=9 15 1 OFF
AUDIO_DIGITAL=0 44100 64 00100100 00000000
AUTOCONN=0 3
AUTO_DATA=OFF OFF
BATT_CONFIG=OFF OFF OFF 3000 4200 10 1470 45 200
BCAST_CONFIG=223344 48 2 2 40000 OFF 2
BT_CONFIG=1 1 1
BLE_CONFIG=250 ON OFF 2 0 1A 0 245DFC020000
BLE_CUSTOM_DB=OFF
CMD_TO=20
COD=240404
CODEC=OFF OFF OFF OFF OFF OFF OFF ON ON
DEEP_SLEEP=OFF ON
GPIO_CONFIG=ON 00
HFP_CONFIG=ON OFF 5 ON OFF ON OFF
LINK_CONFIG=OFF OFF
LOCAL_ADDR=245DFC021557
MIX_AUDIO=OFF OFF
MUSIC_META_DATA=OFF
NAME=AA-021557
NAME_BCAST=AA-021557
NAME_SHORT=AA-021557
POWERMAX=11
PROFILES=ON 1 0 1 1 1 1 1
SPP_UUID=00 00 11 01 00 00 10 00 80 00 00 80 5F 9B 34 FB
SSP_CAPS=3
UART_CONFIG=9600 ON 0
UCAST_CONFIG=0 48 2
UI_CONFIG=OFF OFF ON ON ON ON 0 ON
VOLUME_CONTROL=ON 127 ON

and on the receiver:
config
AUDIO=0 0
AUDIO_ANALOG=9 15 1 OFF
AUDIO_DIGITAL=0 44100 64 00100100 00000000
AUTOCONN=0 3
AUTO_DATA=OFF OFF
BATT_CONFIG=OFF OFF OFF 3000 4200 10 1470 45 200
BCAST_CONFIG=223344 48 2 2 40000 OFF 2
BT_CONFIG=1 1 1
BLE_CONFIG=250 ON OFF 2 0 1A 0 245DFC020000
BLE_CUSTOM_DB=OFF
CMD_TO=20
COD=240404
CODEC=OFF OFF OFF OFF OFF OFF OFF ON ON
DEEP_SLEEP=OFF ON
GPIO_CONFIG=ON 00
HFP_CONFIG=ON OFF 5 ON OFF ON OFF
LINK_CONFIG=OFF OFF
LOCAL_ADDR=245DFC02155E
MIX_AUDIO=OFF OFF
MUSIC_META_DATA=OFF
NAME=AA-02155E
NAME_BCAST=AA-02155E
NAME_SHORT=AA-02155E
POWERMAX=11
PROFILES=ON 1 0 1 0 1 1 1
SPP_UUID=00 00 11 01 00 00 10 00 80 00 00 80 5F 9B 34 FB
SSP_CAPS=3
UART_CONFIG=9600 ON 0
UCAST_CONFIG=0 48 2
UI_CONFIG=OFF OFF ON ON ON ON 0 ON
VOLUME_CONTROL=ON 127 ON

and then I pair them using PAIR_LE <addr> 0
and then I am not sure what connection to open?
utxv or utxm, I tried both but doesn’t seem to be working as expected, the behavior is still the same.

Thank you
Abdo

[IOT747 Team]

You need to set aptx-lowlatency. Do you have a license? You should see (aptX Lossless: ON when you boot).

See below the example.

Board1:

restore
IOT747 Copyright 2022
AudioAgent IDC777 V3.1.83
Build: 0400427b
Bluetooth address 245DFC02157A
Ready
aptX Lossless: ON
PAIR_PENDING
set CODEC=OFF OFF OFF OFF OFF OFF OFF ON ON
OK
set UCAST_CONFIG_TXM=2 48 2
OK
set profiles=on 0 1 0 1 1 1 1
OK
write
(then reset)

pair 245DFC020000
PENDING
PAIR_OK 245DFC020000
PAIR_OK_LE 245DFC020000
open 245DFC020000 utxm
PENDING
OPEN_OK 14 BLE 245DFC020000
OPEN_OK 18 UTXM 245DFC020000
LC3_MEDIA_START 18 SOURCE 8 CONTEXT 0
ABS_VOL 18 197
status
STATE CONNECTABLE[ON] DISCOVERABLE[IDLE] ADVERTISING[ON] SCAN_UNI[OFF]
LINK 14 CONNECTED BLE 245DFC020000 MTU 250
LINK 18 CONNECTED UTXM 245DFC020000 STREAMING APTX GAME_WITH_VBC SNK_RATE 48000 SNK_SDU_INT 5000 SNK_SDU_SIZE 205 SNK_RTN 3 SNK_P_DELAY 6400 SNK_MAX_LAT 5 SRC_RATE 16000 SRC_SDU_INT 5000 SRC_SDU_SIZE 40 SRC_RTN 7 SRC_P_DELAY 33000 SRC_MAX_LAT 9
OK

open 245DFC020010 utxm
PENDING
OPEN_OK 24 BLE 245DFC020010
OPEN_OK 28 UTXM 245DFC020010
LC3_MEDIA_START 28 SOURCE 9 CONTEXT 0

status
STATE CONNECTABLE[ON] DISCOVERABLE[IDLE] ADVERTISING[ON] SCAN_UNI[OFF]
LINK 14 CONNECTED BLE 245DFC020000 MTU 250
LINK 18 CONNECTED UTXM 245DFC020000 STREAMING APTX GAME_WITH_VBC SNK_RATE 48000 SNK_SDU_INT 5000 SNK_SDU_SIZE 205 SNK_RTN 3 SNK_P_DELAY 6400 SNK_MAX_LAT 5 SRC_RATE 16000 SRC_SDU_INT 5000 SRC_SDU_SIZE 40 SRC_RTN 7 SRC_P_DELAY 33000 SRC_MAX_LAT 9
LINK 24 CONNECTED BLE 245DFC020010 MTU 250
LINK 28 CONNECTED UTXM 245DFC020010 STREAMING APTX GAME_WITH_VBC SNK_RATE 48000 SNK_SDU_INT 5000 SNK_SDU_SIZE 205 SNK_RTN 3 SNK_P_DELAY 6400 SNK_MAX_LAT 5 SRC_RATE 16000 SRC_SDU_INT 5000 SRC_SDU_SIZE 40 SRC_RTN 7 SRC_P_DELAY 33000 SRC_MAX_LAT 9
OK

Board2:

restore
IOT747 Copyright 2022
AudioAgent IDC777 V3.1.70
Build: 0400427b
Bluetooth address 245DFC020000
Ready
aptX Lossless: ON
PAIR_PENDING
set CODEC=OFF OFF OFF OFF OFF OFF OFF ON ON
OK
write
OK
reset
IOT747 Copyright 2022
AudioAgent IDC777 V3.1.70
Build: 0400427b
Bluetooth address 245DFC020000
Ready
aptX Lossless: ON
PAIR_PENDING
PAIR_OK 245DFC02157A
PAIR_OK_LE 245DFC02157A
OPEN_OK 14 BLE 245DFC02157A
OPEN_OK 16 URXM 245DFC02157A
LC3_MEDIA_START 16 SOURCE 5 CONTEXT 8
ABS_VOL 16 197
status
STATE CONNECTABLE[ON] DISCOVERABLE[OFF] ADVERTISING[ON] SCAN_UNI[OFF]
LINK 14 CONNECTED BLE 245DFC02157A MTU 250
LINK 16 CONNECTED URXM 245DFC02157A STREAMING APTX GAME_WITH_VBC SNK_RATE 48000 SNK_SDU_INT 5000 SNK_SDU_SIZE 205 SNK_P_DELAY 6400 SNK_TRANS_LAT 3162 SRC_RATE 16000 SRC_SDU_INT 5000 SRC_SDU_SIZE 40 SRC_P_DELAY 33000 SRC_TRANS_LAT 8162
OK

[abdo]

Hi,

Thank you for your reply,

I tried the example and all is good,
Also I was on an older firmware version which was causing me problems,

Thanks,
Abdo

[IOT747 Team]

Tahnsk

[Author]

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