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USB Audio Class – Jimmy's thing
https://jimmywongiot.com/2020/04/08/usb-audio-class/
USB Audio Class 1 standard (1998) This standard allows for 24 bits/96 kHz max. The standard itself doesn’t impose any limitation on sample rate. Class 1 is tied to USB 1 Full Speed = 12 MHz Every millisecond a package is send. Maximum package size is 1024 bytes. 2 channel * 24 bit * 96000 Hz sample rate= 4608000 bits/s or 576 Byte/ms
Fundamentals of USB Audio - EDN
https://www.edn.com/fundamentals-of-usb-audio/
In USB Audio each transfer always carries a whole number of samples; alternating transfers carry 48 and 40 bytes (6 and 5 stereo samples), so that the average rate works out as 44.1 bytes per transfer. A single isochronous transfer can carry 1024 bytes, and can carry at most 256 samples (at 24/32 bits).
AN295: USB Audio Class Tutorial - Silicon Labs
https://www.silabs.com/documents/public/application-notes/AN295.pdf
Firmware Template for USB Audio Cla ss devices. The last section discu sses an example USB Audio Class device. The example shows an Audio Class device that streams a sine wave to the host. 2. USB, Isochronous Transfers, and the Audio Class The USB communications protocol outlines specifications for a reliable and fast system of data transfer ...
USB Audio Simplified - Silicon Labs
https://www.silabs.com/documents/public/white-papers/usb-audio-simplified.pdf
Silicon Laboratories, Inc. Rev 1.0 1. USB Audio Simplified . The rapid expansion of the universal serial bus (USB) standard in consumer electronics products has ... standardized mechanism for transporting audio over USB. The USB audio class specification is available ... In a system with a sampling rate of 48 kHz, the host sends a frame ...
USB Audio Class 2.0 - How to support multiple bit rates ...
https://stackoverflow.com/questions/41702932/usb-audio-class-2-0-how-to-support-multiple-bit-rates-sample-rates
To do multiple sample rates: You have to follow the USB Audio Class 2.0 doc with the CUR, MIN, MAX format and give control to the host. As reference, LE8 is lower endian 8 bits and the defines are converting a 16 or 32 bit integer into an array of 8 bit integers formatted in lower endian. Show activity on this post.
Why can't I play 192kHz audio via the PC-USB connection ...
https://rotel.com/faq/why-cant-i-play-192khz-audio-pc-usb-connection
The current USB audio mode is indicated by the blinking Sample Rate LED as: USB Audio Class 1.0 – Sample Rate 96kHz blinking (Factory Default) USB Audio Class 2.0 – Sample Rate 192kHz blinking Press the PC-USB key again to illuminate the 192kHz sample rate light blinks.
Universal Serial Bus Device Class Definition for Audio …
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. Contributors Gal Ashour IBM Corporation Billy Brackenridge Microsoft Corporation Oren Tirosh Altec Lansing Craig Todd Dolby Laboratories Remy Zimmermann Logitech Geert Knapen Philips ...
High Sampling Rates with USBPre 2 - Sound Devices
https://www.sounddevices.com/high-sampling-rates-with-usbpre-2/
Windows does not support USB Audio Class 2, reverting instead to USB Audio Class 1. As a class-compliant device the USBPre 2 has a maximum sampling rate of 48 kHz in Windows. Supported rates include: 8 kHz, 16-bit 16 kHz, 16-bit 32 kHz, 16-bit 44.1 kHz, 16- or 24-bit 48 kHz, 16- or 24-bit
adc - USB 2.0 full speed audio class max sampling ...
https://electronics.stackexchange.com/questions/391130/usb-2-0-full-speed-audio-class-max-sampling-frequency
USB1.1 frames have a length of 1ms, and isochronous transfers may put up to 1023 bytes into a frame. This gives you roughly 170 stereo 24bit samples per frame – a 170ksample/s rate.
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