WPG World Peace Group launches single-microphone ENC TWS headset solution based on Bluetrum products

On December 7, 2021, WPG Holdings, a leading semiconductor component distributor dedicated to the Asia-Pacific market, announced that its subsidiary WPI has launched a single-microphone ENC TWS headset solution based on the Bluetrum BT8922B2 Xunlong second-generation product.

Figure 1- A display board of WPG World Peace’s single-microphone ENC TWS headset solution based on Bluetrum products

The current TWS headset market has developed from a dark horse to a good horse, and the market and sales have maintained steady growth year by year. According to the research information of market research organization Canalys in November 2020, the global brand TWS headset shipments in 2020 were about 250 million units, a year-on-year increase of 78%. It is expected that the global brand TWS headset shipments will exceed 500 million units during 2022-2024, with an annual compound growth rate of about 19.8%. In this context, more and more brands are beginning to exert their strength in TWS headsets to compete for more market share. The single-microphone ENC TWS headset solution based on Bluetrum BT8922B2 developed by WPG World Peace can reduce non-target voice noise during calls and ensure clear calls.

Figure 2-Application scenario of WPG World Peace’s single-microphone ENC TWS headset solution based on Bluetrum products

Zhongke Lanxun is a high-tech company focusing on the research and development and sales of wireless interconnection SoC chips, with a market share of about 33%. In 2020, the second-generation Xunlong BT892X series was mass-produced and launched, and the market promotion has expanded from the original low-end market to the mid-to-high-end market, which further consolidated its position in the field of TWS headphones. The main control chip BT8922B2 BT SoC used in this solution adopts a 32-bit RISC-V architecture, built-in 256KB RAM & 8Mb Flash, and the main frequency can reach 160MHz. And BT8922B2 supports BT5.2 & BLE dual-mode, with a maximum transmit power of +9 dBm and a receive sensitivity of –94 dBm@2M EDR. In addition, BT8922B2 contains a wealth of audio interfaces, which can support the sound plus AI single-microphone ENC algorithm for better uplink call effects.

In terms of process and power consumption, BT8922B2 uses a 40nm process, which can achieve mainstream power consumption levels. At the same time, the solution integrates earphone charging, two-way communication with the charging case, production test protocol transmission and reception, finished product upgrade, and EQ debugging functions on the VUSB pin and GND pin to achieve a Bluetooth solution that is easier to use and more suitable for production lines.

Figure 3- Block diagram of WPG's single-microphone ENC TWS headset solution based on Bluetrum products

In addition, this solution also uses TDK T4076 analog microphone, Awin AW93001DNR touch chip and JSA-1227 optical proximity sensor module. Thanks to these excellent products, this solution can help designers quickly iterate products and shorten the development cycle to stand out in the increasingly fierce market competition.

Core technology advantages:

High sound quality:

Supports using Equalizer to debug 10-band EQ, with adjustable gain, amplitude, frequency, and Q value;

Support debugging of high and low pass filters;

Support offline and online debugging.

Low latency:

The delay for playing SBC is as low as 55 ms, and the delay for playing AAC is as low as 65ms.

Call noise reduction:

The SDK has been deeply integrated with the sound plus AI single microphone ENC algorithm. The maximum noise reduction amount can be set to 40 dB, and 20 ~ 25 dB is recommended.

Human-computer interaction:

Supports optical proximity sensors, and the misjudgment rate of in-ear detection is lower than that of capacitive sensors;

Supports single-touch and customizable UI.

Low Power Consumption:

The standby power consumption is about 0.5mA, and the call power consumption at 100% volume is about 8mA;

The earphones have been certified by the FCC.

Program Specifications:

Four-layer Layout board, the size can be adjusted according to the TWS headset structure;

Support BT5.2 protocol specification, RF transmission power is + 9dBm (Typ), sensitivity is - 94dBm (Typ);

The following UI features are supported:

The earphones can be turned on when out of the box, turned off when in the box, and turned on and off with a button;

The headset can be paired and interconnected with Bluetooth devices such as mobile phones, and the Bluetooth distance is 360 degrees barrier-free and 10m at any angle;

The left and right earphones can be used separately or together, and the left and right main earphones can be switched automatically;

Audio and video control, answer/reject/make calls, wake up the voice assistant;

Real-time monitoring of battery voltage, low battery warning, and automatic shutdown when the voltage is too low.

Support voice plus AI single microphone ENC algorithm;

Supports SBC, AAC, LHDC, LDAC audio decoders.