Overview

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The BK9531/ BK9532 chip is a chip set for wireless high-quality voice transmission, which comprises a transmitting chip BK9531 and a receiving chip BK9532, wherein each chip covers the frequency range of 160~270 MHz and U The segment is 500~980 MHz. 

The BK9531/ BK9532 adopts the pi/ 4DQPSK digital modulation and high-performance audio ADC and the DAC, and the high-fidelity audio codec is matched with the very low-delay audio codec, so that the high-fidelity digital audio transmission can be applied to the visual singing, the stage performance and the teaching system. 

Since the BK9531/ BK9532 realizes the complete integration from the radio frequency to the base band on a single chip, the pressure expander is omitted, so that the size of the PCB can be remarkably reduced, the production reliability is greatly improved, and the system cost is reduced.

Transmitter Chip BK9531

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² Maximum transmit power: 14 dBm (VHF), 10 dBm (UHF)

² Microphone gain range: 0–47.5 dB, 0.5 dB per step

² Audio AGC and limiting

² Dedicated GPIO indicating transmitted audio signal strength (GPIO3)

² Automatic squelch

² Dual-band diversity transmission

Receiver Chip BK9532

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² Receiver sensitivity: -96 dBm (VHF), -96 dBm (UHF)

² Antenna diversity supporting maximum six antennas and automatic antenna select

² RF AGC and AFC

² Dedicated GPIO indicating the received audio signal strength (GPIO3)

² Dedicated GPIO indicating the synchronization status of transmission and reception (GPIO0)

² Two-band 7-tap digital reverb

² Digital mute

² 15-band digital audio equalization

² Active/passive anti-howling

² Packet loss concealment (PLC)

BK9531/32 common parameter

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² Supports external PCM/I2S dual-mode digital audio interface (mono and stereo)

² Supports audio sampling rates of 48 kHz, 32 kHz, 24 kHz, and 12 kHz

² Recommended operating voltage: 2.8 to 3.6 V (the operating voltage can be as low as 2.2 V, but the chip performance will be worse.)

² Operating frequency: 160–270 MHz (VHF), 450–980 MHz (UHF)

² Crystal frequency: 24.576 MHz, crystal adjustment range: +/-20 ppm

² Digital modulation method: pi/4-DQPSK; occupied bandwidth: < 300 kHz; transmission rate: 204.8 ksps; audio transmission rate: 336 kbps

² Delay: The delay from microphone input to audio output is less than 3 ms (48 kHz sampling rate, anti-howling disabled)

² Audio signal-to-noise ratio: 96 dB; frequency response: 30 Hz to 20 kHz

² One-byte dedicated data channel: 7 kbps, internal CRC check, audio and data are transmitted using 32-bit encrypted words