LG WL1SB23 Wireless Audio Module User Manual
- May 15, 2024
- LG
Table of Contents
User Manual
WL1SB23 Wireless Audio Module
Product name: Wireless Audio Module Product
Model: WL1SB23
Document No：
General specifications
WL1SB23 is based on IA9QH5 chipset that complied with 5.2/5.8GHz ISM Band,and
it is the small size and low power module for Wireless Audio.
IA9QH5 is a system-on-chip (SOC) designed for low-power and low-cost
applications. It is a highly integrated single chip transceiver, supporting
multiple audio interfaces such as I2S, S/PDIF, and USB.
IA9QH5 provides dual transmitter and receiver modes, which enables the
seamless and bi-directional transmission of high quality audio. In the
transmitter, Tx receives digitized stereo as input, which is packetized and
processed for synchronization and data integrity. In the receiver, Rx receives
RF signal, demodulated and processed to restore the transmitted signal, and
then streamed as digital audio output.
- Digital I2S audio interface
- Size : 35mm x 35mm x 4.43 mm
- PCB Pattern Antenna
- RF Freq.(MHz) : 5160 – 5245MHz、5730 – 5845MHz [CE/UKCA only used 5.8GHz]
- Modulation Technique :GFSK
- Crystal : 40MHz, 16PF, ±10PPM
- Short delay time variation
- Low Power Consumption
- operating temperature 0ºC ~ 60ºC
- working voltage 3.3V±0.15V
Block diagram
Note: Frequencies of this transmitter 5160-5245MHz & 5730-5845MHz.
Note: CE/UKCA only used 5730-5845MHz.
The application UI
WL1SB23 Operation description
- First: the module is powered on and started by 3.3V;
- Second: the host transmits the audio signal to the module through I2S;
- Third: THE IA9QH5 on the module decodes the I2S audio signal.
- Fourth: the IA9QH5 RF chip on the module transmits the audio through wireless transmission;
- Fifth: there is I2C communication between the module and the host, both sides obtain the status and control through I2C;
- The product automatically stops the transmission if the information fails to be transferred or the operation fails.
- WL1SB23 as the main device
WL2SB23 Operation description
- First: The module is powered on and started by 3.3V;
- Second: The IA9QH5 RF chip on the module receives the audio signal transmitted by the transmitting module through wireless transmission;
- Third: MCU IA9QH5 decodes the acquired audio signal and transmits the audio to the power amplifier on the subwoofer power amplifier board through I2S;
- Fourth: There is I2C communication between the module and the subwoofer power amplifier board, initializing the power amplifier on the subwoofer power amplifier board, and IO port communication between the module and the subwoofer power amplifier board, controlling the power amplifier switch and LED state display.
- WL2SB23 is a client device controlled by the WL1SB23.
WL1SB23 device is classified as a master device.
WL2SB23 is classified as a Client device under the control of the WL1SB23.
The product automatically stops the transmission if the information fails to
be transferred or the operation fails.
ISED RSS-247 (6.4) required by the technology
When there is no information to transmit or an operation fails, the device
automatically discontinue transmission. After the transmission is
discontinued, the TX module enters the reconnection state until it is
reconnected or the power supply is switched off passively. After the
transmission is discontinued, the RX module enters the RE-connection state for
one minute, IF no connection, enters the standby mode after one minute.
FCC 15.407 (c) required by the technology
The device would automatically discontinue transmission if there is no
information to transmit or if the operation fails. After the transmission is
discontinued, the TX module enters the reconnection state until it is
reconnected or the power supply is switched off passively. After the
transmission is discontinued, the RX module enters the RE-connection state for
one minute, IF no connection, enters the standby mode after one minute.
WL1SB23 (TX module):
The reconnection state is TX will transmit control signal to RX for pair each
other.
The TX re-try to transmit control signal to RX on complete frame or burst
intervals until they connect successfully or power supply be off passively.
WL2SB23 (RX module):
The connection state is no transmit data by RX module. It’s only permit to
transmit the information that is repetitive codes to TX on complete frame or
burst intervals.
The standby mode is enter sleep mode to save consumption power.
On this mode, the RX doesn’t transmit any information or data to TX.
The module-[WL1SB23] is installed in the speaker, and the signal of the sound
is provided through the HDMI or Optical ports of the TV audio products; When
the speaker receive the sound signal, it will transmit the sound signal to
another speaker (which is installed with the module-[WL2SB23]).
5150-5250MHz is limited to use indoor only
RF Technical Specification
RF Technical Specification
Product| Wireless Audio Module
Brand| LG
Modulation| GFSK
Data Rate| 2 Mbps
Frequency Bands| 5160-5245MHz
5730-5845MHz [CE/UKCA only used 5730-5845MHz.]
RF Output Power| 5160-5245MHz| 11.0| dBm (AV) (FCC / IC Used)
5730-5845MHz| 15.0| dBm (AV) (FCC / IC Used)
13.5| dBm (E.I.R.P) (EU UKCA Used)
Channels List| Channel List
U-Nil Band 1
Channel Number| Frequency (MHz)| Channel Ntunber| Frequency (MHz)
0| 5160| 9| 5205
1| 5165| 10| 5210
2| 5170| 11| 5215
3| 5175| 12| 5220
4| 5180| 13| 5225
5| 5185| 14| 5230
6| 5190| 18| 5235
7| 5195| 16| 5240
8| 5200| 17| 5245
Channel List
U-NQ Band 3
Channel Number| Frequency (MHz)| Channel Number| Frequency (MHz)
0| 5730| 12| 5790
1| 5735| 13| 5795
2| 5740| 14| 5800
3| 5745| 12| 5305
4| 5750| 16| 5810
5| 5755| 17| 5815
6| 5760| 15| 5820
7| 5765| 19| 5825
8| 5770| 20| 5830
9| 5775| 21| 5835
10| 5780| 22| 5840
11| 5785| 23| 5845
Antenna Type/Gain| No.| Antenna Part Number| Manufacturer
Shenzhen ZTX| Antenna Type| Frequency (MHz)| Gain (dBi)
1.| WAOA-PCB
(ANT 1)| Communication
Technology Co..
LTD.| PCB Printina Antenna| 5150| 2.64
5200| 2.55
5250| 2.66
5700| 3.49
5750| 3.30
5800| 3.07
5850| 3.21
2.| WAOA-PCB (ANT 2)| Shenzhen ZTX
Communication
Technology Co.,
LTD.| PCB Printing Antenna| 5150| 1.84
5200| 1.94
5250| 1.38
5700| 1.76
5750| 2.45
5800| 2.94
5850| 2.97
This device contains 2 Antennas and the device does not support MIMO and only
for antenna diversty
FCC Statement
Federal Communication Commission Interference Statement
This equipment has been tested and found to comply with the limits for a Class
B digital device, pursuant to Part 15 of the FCC Rules. These limits are
designed to provide reasonable protection against harmful interference in a
residential installation. This equipment generates, uses and can radiate radio
frequency energy and, if not installed and used in accordance with the
instructions, may cause harmful interference to radio communications. However,
there is no guarantee that interference will not occur in a particular
installation. If this equipment does cause harmful interference to radio or
television reception, which can be determined by turning the equipment off and
on, the user is encouraged to try to correct the interference by one of the
following measures:
- Reorient or relocate the receiving antenna.
- Increase the separation between the equipment and receiver.
- Connect the equipment into an outlet on a circuit different from that to which the receiver is connected.
- Consult the dealer or an experienced radio/TV technician for help.
FCC Caution: Any changes or modifications not expressly approved by the
party responsible for compliance could void the user’s authority to operate
this equipment.
This device complies with Part 15 of the FCC Rules. Operation is subject to
the following two conditions:
- This device may not cause harmful interference, and
- This device must accept any interference received, including interference that may cause undesired operation.
Manufacturers integrating the Radio Module into other devices should note the
following:
The device is compliant with part 15.247 and 15.407 of Title 47 of the FCC
rules. If the Link Module is integrated into a new host product, the final
host product still requires Part 15 Subpart B compliance testing with the
modular transmitter installed.
IC Statement
This Class B digital apparatus complies with Canadian ICES-003.
This device complies with Industry Canada license-exempt RSS standard(s).
Operation is subject to the following two conditions:
- this device may not cause interference, and
- this device must accept any interference, including interference that may cause undesired operation of the device.
This Class B digital apparatus complies with Canadian ICES-003.
-Label and Compliance Information
The final end product must be labeled in a visible area with the following:
“Contains FCC ID: BEJ-WL1SB23”,
“Contains IC: 2703H- WL1SB23” .
The grantee’s FCC ID can be used only when all FCC/ IC compliance requirements
are met.
-RF exposure
The module will install into mobile device such as Sound Bar
This equipment complies with FCC radiation exposure limits set forth for an
uncontrolled environment. This equipment should be installed and operated with
minimum distance 20cm between the radiator & your body.
Information on test modes and additional testing requirements
-OEM integrator is still responsible for testing their end-product for any additional compliance requirements required with this module installed (for example, digital device emissions, PC peripheral requirements, additional transmitter in the host, etc.).
The product is placed into a normal “paired” mode with another Audio device,
as per the normal intended use of the product. For example, soundbar, audio
equipment requirement, additional transmitter in the host etc.