Design solutions that pursue the sound quality and experience you need
In mobile broadcast gear, commentary and background music become noticeably out of sync with lip movement once end-to-end delay exceeds the human perception threshold. Conventional Bluetooth A2DP links, constrained by SBC codec buffering and retransmission behavior, typically run above 150 ms of latency — far too high for broadcast synchronization. Lowering delay requires simultaneous work on three fronts: codec selection, buffer strategy, and RF scheduling. That is precisely the design starting point of the Shanngjing BP26 series.
The BP2640Ax integrates Bluetooth 6.0 dual-mode and a 2.4 GHz private link in a single SoC, with the private link delivering sub-5 ms latency. In a practical product, the two links take separate roles: standard Bluetooth A2DP serves public-facing receivers for maximum compatibility, while the 2.4G private link carries low-latency monitoring and return audio between the transmitter and monitoring headphones. When both links are active, an on-chip scheduler manages RF time slots, eliminating the jitter caused by dual-mode switching. This "compatible link + private link" combination is the key to keeping broadcast devices in sync in open environments.
Audio quality before encoding defines the baseline listening experience of broadcast content. The BP2640Ax provides three 32-bit ADC channels with SNR of at least 105 dB, connecting directly to console or preamp line-level signals, while its differential DAC output reaches 120 dB SNR — ample dynamic headroom for monitoring and line output. A high-SNR front end combined with the low-latency link means broadcast content stays clean from pickup through encoding to playback, with no added degradation in the chain. An 8-channel SAR-ADC additionally handles battery gauging and rotary-control sampling, simplifying the overall design.
For deployment: carry the core monitoring loop on the 2.4G private link and reserve Bluetooth A2DP for public distribution; keep the 2.4G antenna away from USB 3.0 and other interference sources, using the BP2640Ax's USB 2.0 HS OTG for firmware updates and audio return; a QFN40 5×5 mm package with 14 GPIOs covers the buttons, indicators, and rotary encoder of a typical broadcast transmitter. With over 10 years of audio solution experience, Liwei Electronics offers complete chip-level and PCBA designs based on the BP26 series for broadcast products — contact us to request a quote for a custom audio solution.
Q: Can the BP26 series run the 2.4G private link and Bluetooth A2DP at the same time?
A: Yes. Both are integrated in one SoC, and an on-chip scheduler allocates RF time slots between them. The typical arrangement uses the private link for low-latency monitoring and A2DP for public distribution, with no second RF chip required.
Q: If the private link is under 5 ms, does that completely eliminate lip-sync issues?
A: The link itself contributes under 5 ms, but total system delay also includes codec buffering and amplifier processing. Even so, keeping the link in single-digit milliseconds makes total delay far below the ~150 ms of legacy A2DP, which resolves broadcast synchronization in practice.
Q: Can the BP2640Ax analog front end connect directly to a mixing console output?
A: Yes. Its three 32-bit ADCs with ≥105 dB SNR handle professional low-level signals directly, and the differential DAC at 120 dB SNR can drive monitoring or line outputs without extra preamplification or noise reduction.
Shenzhen Liwei Electronic Technology Co., Ltd specializes in audio headset and earphone electronic solutions with over 10 years of experience, serving 15+ well-known brands and 300+ clients. Contact Liwei Electronics for a custom BP26 broadcast audio solution.
Keywords: Shanngjing BP26, broadcast audio solution, codec latency, Bluetooth 6.0, 2.4G private link
