If you have a Windows 7 machine with a Realtek sound chipset or drivers, then you may have run into a problem where you randomly hear crackling or popping or static while playing audio through your speakers or even headsets.I realized after doing some research that this is a pretty tricky problem to fix and it can be caused by all kinds of issues from latency to drivers to other hardware, etc., etc.
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When viewed as a process, another related item are Deferred Procedure Calls (DPCs), which are OS functions called either directly or indirectly in response to a raised interrupt, in an asynchronous manner.
By adding the System Interrupts and DPC processing together, you can generally estimate the amount of resources in use responding to IRQ handling. If you are spending a lot of time on interrupt processing, there is a good probability that at least one piece of hardware is failing.
Depending on your system, there could be a high latency affecting performance and thereby causing serious audio problems.
There is a cool program called DPC Latency Checker that monitors your computer’s performance in real time.
This interruption is temporary, and, after the interrupt handler finishes, the processor resumes normal activities. Because it has attracted low-quality or spam answers that had to be removed, posting an answer now requires 10 reputation on this site (the association bonus does not count).
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Interrupts occur below the OS level, so they are not associated with any particular process.
Interrupts (IRQs) exist so that the hardware components of your system can tell the CPU things like "an error occurred", or "the data you requested is now available", or "this device would like to send data".
This won’t work for everybody, but if you have it in Device Manager, it is probably the cause.