The 2.4GHz Wireless Audio Transmission Module is comprised of a transmitting and receiving module both employing Nordic Semiconductor’s nRF52832 multiprotocol SoC. At first use the modules are paired in a one-to-one mode to ensure multiple wireless devices can be used simultaneously in any given environment.
In operation, the audio signal is connected to the audio input port of the transmitting module, and after amplification, filtering, and sampling the signal is converted into a digital version for Digital Signal Processing (DSP) by the nRF52832 SoC. The SoC’s Arm Cortex M4 processor is designed to support the floating point and DSP computations typical of such high-end wireless applications. The audio data is then relayed to the receiving module using the Nordic’s SoC’s 2.4GHz multiprotocol radio. The Nordic SoC’s Arm processor in the receiving module decodes the data, then relays it to the digital/analog converter to complete the wireless transmission of the audio signal. The high sample rate (48kHz) and low delay (less than 5ms) solution ensures quality audio reproduction.
"Our company has been working in the field of wireless audio signal transmission for more than 20 years, and we have learned a lot during that time about producing high quality audio," says Wenxiang Jia, Chief Development Engineer, Yinzida Technology. "The modules are designed for companies developing solutions such as microphones and electric guitars that demand high quality, plug-and-play digital audio wireless transmission. The biggest advantage of the solution is the audio digital processing capability and the lossless and stable wireless transmission."
The nRF52832 SoC's Arm Cortex-M4 CPU with floating point unit running at 64MHz performs as the main microprocessor for the modules, responsible for collecting the digital audio stream, supervising the coding and decoding algorithms, I2S communication, RF control as well as power management. The 64KB RAM and 512KB Flash also provide ample and flexible memory options during development.
"We have worked with Nordic for a number of years and selected the nRF52832 SoC for a wide range of reasons including the powerful processor and high link budget 2.4GHz radio," continues Jia. "The receiving sensitivity of the radio ensures the wireless transmission signal is more stable producing better quality audio. Also, the SoC’s overall low power consumption provides developers of battery-powered audio solutions with a significant competitive advantage."
The SoC is built around an Arm Cortex-M4 CPU with floating point unit running at 64MHz. It has NFC-A Tag for use in simplified pairing and payment solutions. It has numerous digital peripherals and interfaces such as PDM and I2S for digital microphones and audio. Exceptionally low energy consumption is achieved using a sophisticated on-chip adaptive power management system.
The boards are available exclusively from www.yinzida.com
www.nordicsemi.com
