![]() ![]() Many AES-EBU Grade One reference clocks (and there is absolutely no point in acquiring a master clock which has a lower specification) cost in the region of a thousand pounds, for example. However, high-quality word-clock generators are usually expensive beasts - especially if external video referencing is required. The M-Clock has been designed specifically to meet the needs and budget of typical semi-professional and home digital studios. Cannot be locked to an external word clock or video reference.Īn innovative and extraordinarily cost-effective master word-clock generator incorporating four channels of built-in sample rate conversion.Four sample rate converters built in, with multiple synchronised outputs.Plentiful word clock and 'digital black' outputs.AES-EBU Grade One stability and excellent jitter performance.Often budget converters employ relatively low-quality internal clocks, and a significant performance improvement can be obtained by driving such converters from a high quality master word clock, which typically has far greater stability and much less jitter. This 'sampling error' manifests itself either as high-frequency noise in extreme cases, or more often as an imprecise stereo image. Instead of hearing the rapid pitch variations known as flutter, though, jitter causes the sampling instants to occur slightly earlier or later than they should. An unstable clock (or poor-quality interfaces and cables) creates 'jitter' - the digital equivalent of 'flutter' in analogue replay systems. Where the area also handles audio for video production this master clock generator may be referenced from a video sync-pulse generator (or may generate video syncs itself) to ensure that the digital sample rate is locked precisely to the video frame rate - an essential condition where digital audio and video cohabit.Īnother important facet of a digital system is that the quality of the analogue-to-digital and digital-to-analogue conversion process is heavily dependent on the stability of the reference word clock. In large professional digital studios this is usually achieved by using a master word-clock generator, the outputs of which are distributed to all the digital equipment: the digital desk, the various replay machines, A-D converters, sample-rate converters, and so on. Digital signals can only be mixed together if their samples arrive at the mixer at the same instant in time, and at the same average rate. In addition to the AES-EBU & coaxial S/PDIF outputs available on the rear panel, four S/PDIF optical outputs are provided on the front.Most audio engineers who work regularly with digital audio equipment will already have grasped the necessity to ensure that everything within a digital studio system is sample-rate synchronous. ![]() ![]() Drawmer's affordable new combination of master clock and sample rate converters provides an ingenious solution for high-quality digital interfacing in the home studio. ![]()
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