![]() ![]() ![]() You need to synchronize your running to a higher standard. The champagne spills, resulting in an error and a loss of information. Because your body is bobbing up while your partner’s body is bobbing down, you have difficulty passing a glass of champagne (digital word) between you. You are not in sync (like, you are each following a different clock). In fact, your partner’s left foot is hitting the sand fractions of a second after your right foot hits the sand. But as you look down at the warm ocean water flowing over your toes you notice that your feet do not hit the sand at the same time as your partner’s. This would be like you are running at the same sample rate. So that you can look each other in the eyes lovingly, you are running at the same speed (it would be quite rude if one of you was trying to outrun the other). Here’s an analogy: Imagine that you and your significant other are running on the beach together ( cue romantic music please ). The first part is easy due to the fact that most digital devices have a menu where you set the sample rate. First, they must be set to the same sample rate, and secondly, their word clocks must be synchronized. In order for the two devices to properly exchange data, we need two things to happen. For example, if the clock in your digital console was actually running at 44,101 kHz (which would be considered a massive error), you probably wouldn’t notice - that is, until you tried to patch the digital output of that console into the digital input of another device such as a system processor. When using only one digital device, miniscule errors in the clock (known as jitter) can go unnoticed because the system is “closed” and there is nothing to compare it to. If not, we run into problems (errors) that can create noise, loss of signal and possibly an undesired change in pitch. Each of these samples is represented by a number or a digital “word.” Every digital audio device has an internal clock to regulate the speed at which these samples are taken, and to make sure that there are in fact precisely the correct number of samples per second as specified by the sample rate (e.g. A sample rate of 44.1 kHz means that there are 44,100 slices of audio or “samples” per second. So here we go.Īudio entering our digital mixing consoles is passed through an analog-to-digital converter (A-to-D or ADC), where it is electronically chopped into slices called samples. Understanding word clock is critical when interfacing digital gear, and that requires a brief review of digital audio. Often (but not always) these signals are combined on a single cable, so we don’t realize that word clock is being sent along with the audio. Any time that digital audio is transferred between devices, there are two distinct components to the signal: the audio, and something called word clock. Last month, we touched upon the idea of routing digital audio from an outboard channel into a digital mixing console. Does Anybody Really Know What Time it Is? ![]()
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