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AN295: USB Audio Class Tutorial - Silicon Labs
https://www.silabs.com/documents/public/application-notes/AN295.pdf#:~:text=Isochronous%20data%20transfers%20can%20be%20used%20by%20universal,transfers%20to%20transmit%20audio%20signals%20in%20real-%20time.
US8583269B2 - Isochronous audio network software …
https://patents.google.com/patent/US8583269B2/en
These networks are considered isochronal when audio devices on the network respond to a clock signal in a manner similar to a synchronous serial communication system. The networks rely on …
10 Frequently Asked Questions on LE Isochronous …
https://www.bluetooth.com/blog/10-frequently-asked-questions-on-le-isochronous-channels/
It enables the transmission of multiple, independent, synchronized audio streams between an audio source device, such as a smartphone, and one or more audio sink devices like earbuds or earphones. To support Multi-Stream Audio, Connected Isochronous Group (CIG) and Connected Isochronous Stream (CIS) were introduced.
Isochronous Control + Audio Streams for Acoustic Interfaces
https://lac.linuxaudio.org/2019/doc/neupert.pdf
Our aim is an isochronous transfer of data and audio rate signals with minimal latency, and more importantly, with little jitter [22]. The touch position data needs to be present before the audio arrives to be able to tune the synthesis. There can’t be any variation to the offset between signal and data. The audio stream doesn’t need to be
Asynchronous and Isochronous - DAC - Digital to Analog ...
https://audiophilestyle.com/forums/topic/31603-asynchronous-and-isochronous/
USB audio always uses isochronous transfers. Asynchronous means the DAC has it's own clock, whereas a synchronous DAC would derive the clock from the USB packet timing. Just about all DACs these days use asynchronous adaptive mode wherein the amount of data sent in each isochronous packet is varied to match, on average, the master clock in the DAC.
Fundamentals of USB Audio - EDN
https://www.edn.com/fundamentals-of-usb-audio/
The isochronous endpoints run at a rate of one transfer per 125 us; or 8,000 transfers per second. Dividing the required byte rate over the frame rate gives us the number of bytes for each isochronous transfer: 768,000/8,000 = 96 bytes per transfer. When using CD rates, such as 44,100 Hz, the transfer rate works out as 44.1 transfers per second.
How to transfer data to USB isochronous endpoints ...
https://docs.microsoft.com/en-us/windows-hardware/drivers/usbcon/transfer-data-to-isochronous-endpoints
A Universal Serial Bus (USB) device can support isochronous endpoints to transfer time-dependent data at a steady rate, such as with audio/video streaming. To transfer data, the client driver issues a request to read or write data to an isochronous endpoint.
AN295: USB Audio Class Tutorial - Silicon Labs
https://www.silabs.com/documents/public/application-notes/AN295.pdf
Isochronous Endpoint Descriptor Assigns an endpoint to be the audio stream’s isochronous end- point. Isochronous Endpoint Audio Class Descriptor Gives Audio Class-specific characteristics of the isochronous endpoint. HID Interface Descriptor Defines the HID interface. HID Descriptor Describes the capabilities of the HID interface.
LE Audio Specifications - Bluetooth® Technology Website
https://www.bluetooth.com/learn-about-bluetooth/recent-enhancements/le-audio/le-audio-specifications/
The Bluetooth Core Specification was enhanced in December 2019 to enable delivery of audio over Bluetooth LE, including a new LE Isochronous Channels feature. LC3: Low Complexity Communications Codec A new specification released in September 2020 that defines a high-quality, low-power audio codec.
Asynchronous USB is actually synchronous (Isochronous ...
https://www.audiosciencereview.com/forum/index.php?threads/asynchronous-usb-is-actually-synchronous-isochronous.3842/
audio data doesn't allow "asynchronous", Asynchronous is for USB fingers and portable drives what asynchronous is just the clock singal, not the data, data is always synchronous (should be isochronous) Asynchronous means acting as own clock source, that's pretty pretty old stuff, but marketing makes it wow we're new king, no
Synchronous, Asynchronous, Isochronous. What Does it Mean?
http://bucarotechelp.com/networking/basics/88092302.asp
Isochronous (pronounced "eye-sock-ron-us") An isochronous data transfer system combines the features of an asynchronous and synchronous data transfer system. An isochronous data transfer system sends blocks of data asynchronously, in other words the data stream can be transferred at random intervals. Each transmission begins with a start packet ...
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