![]() This is largely because the master clock must transmit duplicate clock signals down multiple cables (and sometimes in multiple electrical formats, WC, AES etc) to all the devices in the system, and therefore jitter can be generated in the cables! Word Clock However, master clock devices tend to be expensive, too expensive for many project studio owners, and for complex reasons can produce more timing errors resulting in a deterioration in audio quality. It is possible to daisy chain devices together but because of the differing digital audio connectors ( SPDIF, AES, TOS-link etc) it may be more convenient to have one dedicated master clock device supplying duplicates of a single clocking signal to each slave device individually by way of independent connector leads. In a multiple device digital audio system, one device (preferably the ADC) must be the master (supplying a clock timing signal) and all the others will be slave devices synchronising to the master device at its sample rate. In general, given that most converters use extremely accurate crystal clock technology, audible jitter is more likely to occur during transmission down a cable than in a converter. Therefore it is preferable to choose the device with the ADC as the clock source for the whole system. The DAC will eliminate any jitter generated by processing or transmission. If a signal had been digitised by a good ADC with an accurate clock, then any jitter introduced during processing or transmission won't be audible providing the systems DAC operates without jitter and is synchronised to the same clock source as the ADC. It is important to understand that "jitter" and "drift" only affect audio quality if they occur during analogue/digital and/or digital/analogue conversion in a ADC or DAC. NOTE: You may also wish to read Connectors in the recording studio to understand a little more about the variety and uses of digital audio connection technologies. Here are some of the devices that may be connected together in a digital audio system. If the signals and devices are not synchronised, audible clicks and pops will result every time a receiving device fails to correctly anticipate the arrival of samples in an incoming signal. Therefore, their sample rates will need to be identical and they will need to meet "in sync". ![]() Like 2 cogs in a mechanical system, they must mesh. Unlike analogue audio connections, when multiple digital audio signals meet or move together between devices (such as a digital mixer and a DAW-digital audio workstation) they must be synchronised by a common clock.
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