BK9520是用于无线麦克风的芯片组，包括V段发射芯片BK9521、V段接收芯片BK9522、U段发射芯片BK9523和U段接收芯片BK9524。V段频率覆盖160~270MHz，U段频率覆盖500~980MHz。
BK9520采用数字调制和高性能音频ADC和DAC，配合极低延迟的音频编码器，实现了高保真的数字音频传输，可以应用于视唱、舞台演出以及教学系统。由于BK9520在单芯片上实现了从射频到基带的完全集成，同时省却了压扩器，这样可以显著减小系统的PCB尺寸，极大的提高生产可靠性。(BK9520 is a chip set used for wireless microphone, including V segment transmitter BK9521, V segment receiver chip BK9522, U segment transmitter chip BK9523 and U segment receiver chip BK9524. The frequency of the V segment covers 160~270MHz, and the frequency of the U segment covers 500~980MHz.　　　　　　BK9520 uses digital modulation, high-performance audio ADC and DAC, and very low latency audio encoder to achieve high fidelity digital audio transmission. It can be applied to solfeggio, stage performance and teaching system. Because BK9520 realizes the integration from radio frequency to baseband on single chip, and saves the companding device, so that the PCB size of the system can be significantly reduced, and the production reliability can be greatly improved.)