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AVR32716: AVR UC3 USB Audio Class
https://ww1.microchip.com/downloads/en/Appnotes/doc32139.pdf
AVR UC3 USB audio class. The application operates in the USB device mode, enumerating as a “stereo headset with microphone”. It uses the USB Audio and HID (consumer) classes. An essential issue in audio is synchronization of the data streams. Indeed, the smallest artifacts are easily detected by the human ear.
USB audio class 2 | AVR Freaks
https://www.avrfreaks.net/forum/usb-audio-class-2
Is there a chance AVR USB parts will have the strength to implement USB Audio Class 2? Asynchronous transfer would be particularly interesting. That is, the DAC requests samples from the PC through the USB interface. It can do this based on its own nice clock.
myMicrochip
https://www.microchip.com/en-us/product/AT32UC3A1512
High-performance, low-power 32-bit AVR RISC-based microcontroller combines 512KB flash, 64KB SRAM, 10/100 ethernet MAC, full-speed (12 Mbps) USB 2.0 with embedded host capability, I2S, and a built-in audio D/A converter. The MCU achieves 91 Dhrystone MIPS (DMIPS) at 66 MHz while consuming only 40 mA at 3.3V.
Atmel AVR Digital Audio Platform - ww1.microchip.com
https://ww1.microchip.com/downloads/en/DeviceDoc/8433C-MCUAVR-E-US-0912_LR.pdf
audio player reference design supports the following: • MFi, MP3, WMA and AAC audio and metadata decoding • Ready-to-use USB protocol stack, classes and file systems • Sample rate conversion • Audio player API • Application notes on USB, I2S, audio decoding and more • Development and evaluation board AVR UC3 Microcontroller Streaming
Atmel AVR32839: AVR UC3 Audio Player
https://ww1.microchip.com/downloads/en/AppNotes/doc32177.pdf
Atmel AVR32839: AVR UC3 Audio Player Features • Music played over mass storage device –USB dski – SD card † Software audio decoders † FAT file system † USB host mass storage class (MSC) † Standalone - low memory footprint (c ode & RAM) and no operating system dependency † Configurable audio output – External I2S audio DAC
Atmel AVR4950: ASF - USB Host Stack
https://ww1.microchip.com/downloads/en/DeviceDoc/doc8486.pdf
notes (Classes: HID, CDC, MSC, PHDC, AUDIO). To create a USB host with one of the ASF provided classes, refer directly to the related application note for this USB class. The USB host stack and USB host vendor class application notes are designed for advanced USB developers. AN AVR4951 ASF - USB host Vendor Class AN AVR4953 ASF - USB host HID mouse
USB Device Audio Solutions - Microchip Technology
https://www.microchip.com/en-us/solutions/consumer/audio-and-speech/audio-solutions/usb-device-audio-solutions
The audio data will be sampled at 48 kHz with 16 bits per sample. The system will interface to a USB host (such as a personal computer), which can accommodate a USB device class speaker. The audio will be streamed via the PC through the PIC32 MCU to an external speaker.
Universal Serial Bus Device Class Definition for Audio Devices
https://www.usb.org/sites/default/files/audio10.pdf
USB Device Class Definition for Audio Devices Release 1.0 March 18, 1998 ii Scope of This Release This document is the 1.0 release of this device class definition.
myMicrochip
https://www.microchip.com/en-us/product/AT32UC3A464
32-bit AVR microcontroller designed for exceptionally high data throughput with Hi-Speed USB OTG, SD/SDIO card and Multi-Level-Cell (MLC) NAND flash with ECC interfaces. Designed with the multi-layered 32-bit AVR databus, 128 KB on-chip SRAM with triple high speed interfaces,and multi-channel Peripheral and memory to memory DMA controller, the AT32UC3A464S offers …
Atmega 32u4 Based USB Microphone (Part 16/25)
https://www.engineersgarage.com/atmega-32u4-based-usb-microphone-part-16-25/
The AVR based Lightweight USB Framework (LUFA) is used as the firmware of the chip which is modified to accept analog audio input and send out the USB encoded digitized audio stream. In the USB protocol, there is a separate device class for audio devices – Audio Class 1.0 .
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