![]() The cause could be that on the PCB USB signals are routed close to a switching voltage regulator, for example. PCB mounted USB ports - On some PC main boards (or laptops) signal quality of some USB ports is insufficient for isochronous streaming. ![]() Tip: Stay away from special USB cable offerings optimized for audio, or cables which include additional functionality such as status LEDs. Try a shorter cable (less than 2 meters). Also, the maximum allowed cable length of 5 meters should not be exceeded. Some cables available in the market are not suited for USB 2.0 high-speed communication (480 Mbps). USB cables - Quite often, the USB cable (or its connectors) is the cause for USB signal distortions. works well on a given USB port using a given cable while an audio device does not work with the same port or cable.īelow is a list of possible sources for these kinds of problems. For this reason, it is possible that a mouse, keyboard, FLASH drive, printer etc. These kinds of devices are much more tolerant with respect to USB signal distortion. FLASH drive, printer) are based on bulk transfer mode, which uses automatic retransmission in case of errors. This means that a USB audio device can work only if the USB signal quality is good and no CRC errors occur. This leads to audio signal distortions (clicks). Electrical noise on USB signals causes CRC errors and thus data loss. Isochronous transfer mode uses error checking but no retransmission in case of CRC errors. The Windows USB Audio Driver allows users to adjust internal buffer depths to find a trade-off between audio latency and compatibility with a given system. in case of music playback) then the timing requirements of the driver are relaxed, which increases compatibility with other applications and drivers significantly. to create a monitor mix in the PC and route it back to headphones) then the operating system must be able to handle the timing requirements of the driver and issues can occur otherwise. However, in this context it is important to note that real-time requirements depend directly on audio latency requirements. Software components that impact the real-time behaviour of the operating system are not compatible with audio streaming applications in general. Due to the real-time nature of USB audio streams there are also requirements for the time characteristics of the operating system and third-party software components installed on the system. USB audio devices have greater requirements for USB hardware and software layers than other USB devices. This might not be the case even though the PC fulfils the system requirements - there is always a risk that hardware and/or software issues will cause problems. This is available from the driver section of the product Software pages.įor USB audio streaming to work reliably, the computer must be able to process incoming and outgoing isochronous data streams in real time. System requirements and instructions for the Windows USB Audio Drivers are specified in the driver Help Manuals. This article applies to Qu and ZEDi series mixers only.
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