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AVR32716: AVR UC3 USB Audio Class
https://www.microchip.com/content/dam/mchp/documents/OTH/ApplicationNotes/ApplicationNotes/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 - App note AVR32716 | AVR Freaks
https://www.avrfreaks.net/forum/usb-audio-app-note-avr32716
For AT32UC3A3 device, as it supports high speed USB, it can support 88.2 and 96khz sampling rate with 24 bit. But for higher sampling rates such as 176.4 and 192khz with 24 bit stereo the USB end point can not support the number of bytes required (1152 for 192khz,1059 for 176.4) for every millisecond.
myMicrochip
https://www.microchip.com/en-us/product/AT32UC3A0512
AN_32139 - AVR32716: AVR UC3 USB Audio Class Application Notes Download Link : AN_7745 - AVR32784: 32-bit AVR UC3 USB DFU Bootloader Application Notes Download Link : AN_32074 - AVR32006: Getting Started with GCC for 32-bit AVR ...
Dynamic Dev Tool Page | Microchip Technology
https://www.microchip.com/en-us/development-tool/ATEVK1105
AN_32139 - AVR32716: AVR UC3 USB Audio Class 10 Dec 2016 Application Notes AN_32160 - AVR32825: Executing code from external SDRAM 10 Dec 2016 Application Notes AN_8431 - AVR4029: Software Framework - Getting Started 10 Dec 2016 ...
Design Resource Center – Microchip | DigiKey
https://www.digikey.com/en/product-highlight/a/atmel/resource-center
AVR32801: 32-bit AVR UC3 A3 series Schematic Checklist : AVR32715: AVR UC3B 32-bit Microcontroller Schematic Checklist : AVR32716: AVR UC3 USB Audio Class: AVR32788: Using the 32-bit AVR UC3 SSC in I2S mode : AVR32831: AVR UC3C Scope Meter and Filtering Demonstration : AVR32839: AVR UC3 Audio Player : AVR32840: AVR UC3 Audio Player - MAD …
Playing back audio without using libraries? Resources I ...
https://forum.arduino.cc/t/playing-back-audio-without-using-libraries-resources-i-can-learn-from/477745
Getting Started with the SAMA5D2 Audio Subsystem. AVR32788: AVR®32 How to use the SSC in I2S mode. Atmel AVR32716: AVR UC3 USB Audio Class... plus the SSC (I2S) section of Sam3x(DUE) datasheet. Good luck
SAMD21 USB Audio Feedback Endpoint | AVR Freaks
https://community.atmel.com/forum/samd21-usb-audio-feedback-endpoint
After about 1 minute of playing audio the buffer over/underflows and there is heavy distortion played for a few seconds. This is repeated every 1 - 1.5 minutes of playback. I already found the App Note for the AVR32 which deals with the sync: Atmel AVR32716: AVR UC3 USB Audio Class. 4 different methods of synchronization are described.
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