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copies can be made with no error However, when the component receiving a signal must reconstruct the analog waveform, then it must recover the clock as well as the data In this case, the equipment should reduce jitter as much as possible before regenerating the signal The problem is that there is a tradeoff between data accuracy and jitter reduction Receiver circuitry designed to minimize data errors sacrifices jitter attenuation15 The ultimate solution is to decouple the data from the clock Some manufacturers have approached this goal by putting the master clock in the DAC (which is probably the best place for it) and having it drive the servo mechanism and readout speed of the drive RAM-buffered time-base correction in the receiver is another option This reclocks incoming bits by letting them pile up in a line behind a little digital gate that opens and closes to let them out in a retimed sequence This technique removes all incoming jitter but introduces a delay in the signal The accuracy of the gate determines how much new jitter is created The quality of digital interconnect cables makes a difference, but only up to a point The more bandwidth in the cable, the less jitter there is Note that a digital audio cable is actually transmitting an analog electrical or optical signal There is a digital-analog conversion step at the transmitter and an analog-digital conversion step at the receiver This is the reason interface jitter can be a problem However, the problem is less serious than when an analog interface cable is used because no resampling of analog signal values occurs Much ado is made about high-quality transports disc readers that minimize jitter to improve audio and video quality High-end systems often separate the transport unit from other units, which ironically introduces a new source of jitter in the interface cable Jitter from the transport is a function of the oscillator, the internal circuitry, and the signal output transmitter In theory, media jitter and transport jitter should be irrelevant, but in reality, the oscillator circuitry is often integrated into a larger chip, so leakage can occur between circuits It is also possible for the servo motors to cause fluctuations in the power supply that affect the crystal oscillator, especially if they are working extra hard to read a suboptimal disc Other factors such as instability in the oscillator crystal, temperature, and physical vibration may introduce jitter A jitter-free receiver changes every-
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The jitter tolerance characteristic of a PLL circuit is inversely proportional to its jitter attenuation characteristic That is, the more slack the circuit allows in signal transition timing, the more jitter gets through This situation can be improved by using two PLLs to create a two-stage clock recovery circuit
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thing If the receiver reclocks the signal, you can use the world s cheapest transport and get better quality than with an outrageously expensive, vacuum-sealed, hydraulically cushioned transport with a titanium-lead chassis The reason better transports produce perceptibly better results is that most receivers do not reclock or otherwise sufficiently attenuate interface jitter Even digital receivers with DSP circuitry usually operate directly on the bit stream without reclocking it Interface jitter affects all digital signals coming from a DVD player: PCM audio, Dolby Digital, DTS, MPEG-2 audio, and so on In order to stay in sync with the video, the receiver must lock the decoder to the clock in the incoming signal Since the receiver depends on the timing information recovered from the incoming digital audio signal, it is susceptible to timing jitter There is an ongoing tug of war between engineers and critical listeners The engineers claim to have produced a jitterless system, but golden ears hear a difference After enough tests, the engineers discover that jitter is getting through somewhere or being added somewhere, and they go back to the drawing board Eventually, the engineers will win the game Until then, it is important to recognize that most sources of jitter have little or no perceptible effect on the audio or video
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