In recent years, with the rapid development of the IoT economy and the profitable growth of new media, traditional television stations' programs cannot satisfy the audience's high standards for entertainment. In this case, numerous live stream influencers spring up, causing a trend of individual streamers. It is necessary to have practical tools to do good work. Therefore, to create differentiation and stand out above the rest in the influencer market with fierce competition, a set of external USB sound card with multiple functions is essential for live streaming. 

The high-performance microcontroller of the Nuvoton NuMicro^® M484 series with Cortex-M4 core can run up to 192 MHz. Simultaneously, the built-in DSP and FPU can support 512KB Flash memory and 160KB SRAM memory that provides adequate computing performance and memory capacity for executing audio algorithms. Also, the M484 series has rich peripheral interfaces, including a set of high-speed USB ports and a set of full-speed USB ports to connect more than one phone or computer device at one time (e.g., phones for live streaming and accompaniment). The two sets of USB ports with built-in PHY can reduce the costs listed in BOM. Furthermore, the M484 series has 5 I²S interfaces to support various audio I/O requirements and provides 5 SPI interfaces and 2 SD card interfaces to support external memory devices to save multiple sound effects. 6 UART interfaces are also available for connecting the external Bluetooth module. 

Summarized advantages of M484 series applied to USB sound card development:

• 192MHz CPU with DSP/FPU - high operating frequency increasing the processing speed of audio signals
• Provide 512 KB Flash and 160 KB SRAM - sufficient memory resource to support the demand of audio algorithm
• Support 2 sets of USB ports (high speed and full speed) with built-in PHY - support phones for live streaming and accompaniment at one time
• Support 5 I2S communication - connect the earphones, microphone, and headset at one time
• Support 5 SPI and 2 SD card interfaces - support various sound effects storage via external memory space
• Support 6 UART interfaces - for external Bluetooth module communication