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Jitter is the term used to describe the temporal clock jitter during the transmission of digital signals, a slight variation in accuracy in the transmission clock. Jitter is normally undesirable as an interfering signal. More generally, jitter in transmission technology is an abrupt and undesirable change in signal characteristics. This can affect amplitude as well as frequency and phase position. The jitter is the first derivative of a delay. The spectral representation of the temporal deviations is called phase noise. Jitter should not be confused with quantization errors.
In network technology, jitter is also used to describe the variance of the runtime of data packets. This effect is particularly annoying with multimedia applications on the Internet (such as Internet radio and Internet telephony), as packets may arrive too late or too early to be output in time. The effect is reduced by a so-called jitter buffer , a special "data buffer", but at the price of additional runtime, which is particularly disturbing in dialog applications. This effect also plays a role in process control technology. Critical process information must be sent and received within a specified time. If the jitter becomes too large, a timely arrival of the critical process information is not guaranteed.
Snom's specialty and special feature compared to VoIP phones of other providers is among other things the almost perfect handling and balancing of jitter problems. Snom's telephones achieve a particularly natural speech and sound image.