A hardware interrupt causes the processor to save its state of execution via a context switch, and begin execution of an interrupt handler. USB interupts and how to eliminate dropoutsĪn interrupt in this context is basically when the Windows kernel halts execution of applications while some work needs to be performed by a driver - wikipediaĪn interrupt is an asynchronous signal from hardware indicating the need for attention or a synchronous event in software indicating the need for a change in execution. If your overall usage is not near 100%, and especially if it's nothing like being close to capacity, you should use the following techniques to check what is happening inside the Windows kernel and causing dropouts. Giving your CPU more time to do the work of streaming the audio over USB. If your overall usage is close to 100% and you're getting dropouts, try raising the size of your USB buffer size. In Windows 8 and Windows 8.1, you may need to check the 'Performance' tab, as the SeratoDJ.exe process is not as indicative of overall CPU usage. Open up the task manager - Task Manager (Ctrl+Shift+Esc)Īnd click on the 'Processes' tab, check what your overall CPU usage is like and percentage the application is using. The first thing is to check if the CPU is busy doing something else, or is not up to the task of feeding the buffer and feeding the buffer to the USB: If one of these isn't behaving correctly, or can't perform it's work in time, you can guess the result. The work is done by the CPU and the USB controller, which are under the control of a few co-operative things the operating system, the BIOS, and drivers, ultimately at the request of the audio application.

This is a USB dropout.Īs explained above, maintaining an isochronous stream requires 'stuff' to happen at a certain time, with a 1ms (millisecond) USB buffer size the program only needs to send about 350 Bytes of data each ms over USB, but this needs to happen every millisecond, otherwise you'll (obviously) experience a dropout. If for some reason what is in the buffer can not be fed onto the bus, the USB dropout indicator may light, and more often than not, you will hear an audible click or glitch in the audio. That is, it is 'fed' at precise intervals from our USB buffer. The Serato Software will create what's known as an isochronous stream of audio data over the USB bus. If you're getting audio glitches, clicks or dropouts, then there is a high chance you may be experiencing a USB dropout.Ī USB dropout may be shown by the USB dropout indicator lighting in your Serato Software however this may not always happen.

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