We can leverage the Pico's built-in USB Audio Class functionality to turn it into a USB microphone device. The Tiny USB library is "an open source cross-platform USB stack for embedded systems" that supports a variety of MCUs, including the Raspberry Pi RP2040, and features device and host mode support. The TinyUSB library serves as the Raspberry Pi Pico SDK's USB software stack. The RP2040 MCU on the Raspberry Pi Pico board offers a "USB 1.1 Host/Device" functionality that lets you to connect to an existing USB peripheral device (host mode) or develop your own USB peripheral (device mode). USB is a widely used standard for connected computer peripherals such as keyboards, mouse, printers, scanners, and microphones that was first introduced in 1996.
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