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The question is highly dependent on the quality of the systems analog or digital under review, and other factors which are not necessarily related to sound quality. Arguments for analog systems include the absence of fundamental error mechanisms which are present in digital audio systems, including aliasing and quantization noise.
One of the most limiting aspects of analog technology is the sensitivity of analog media to minor physical degradation. Analog recordings by comparison require comparatively bulky, high-quality playback equipment to accurately read the signal from their analog media.
Error correction[ edit ] Early in the development of the Compact Discengineers realized that the perfection of the spiral of bits was critical to playback fidelity.
A scratch the width of a human hair micrometres could corrupt several dozen bits, resulting in at best a pop, and far worse, a loss of synchronization of the clock and data, giving a long segment of noise until resynchronized. In essence, error correction can be thought of as using the mathematically encoded backup copies of the data that was corrupted.
Not only does the CD use redundant data, but it also mixes up the bits in a predetermined way see Cross-interleaved Reed-Solomon coding so that a small flaw on the disc will affect fewer consecutive bits of the decoded signal and allow for more effective error correction using the available backup information.
Error correction allows digital formats to tolerate significant media deterioration though digital media is not immune to data loss. Disc rot was most troublesome to the Laserdisc format, but also occurs to some pressed commercial CDs, and was caused in both cases by substandard disc manufacture.
Duplication and other aspects[ edit ] Unlike analog duplication, digital copies are exact replicas that can be duplicated indefinitely and without generation loss. This makes rights management a more pressing issue in digital media than analog media.
See digital rights management Digital systems often have the ability for the same medium to be used with high or low quality encoding methods and number of channels or other content. Some analog recording systems offer similar options through recording speed and head selection.
Digital systems that are computer -based make editing much easier through rapid random access, seeking, and scanning for non-linear editing. Most digital systems allow non-audio metadata to be encoded into the digital stream, such as information about the artist, track titles, etc.
Noise and distortion[ edit ] In the process of recording, storing and playing back the original analog sound wave in the form of an electronic signalit is unavoidable that some signal degradation will occur.
This degradation is in the form of distortion and noise.
Noise is not correlated to the original signal, while distortion is. Noise performance[ edit ] For electronic audio signals, sources of noise include mechanical, electrical and thermal noise in the recording and playback cycle.
The amount of noise that a piece of audio equipment adds to the original signal can be quantified. Sometimes the maximum possible dynamic range of the system is quoted instead. With digital systems, the quality of reproduction depends on the analog-to-digital and digital-to-analog conversion steps, and does not depend on the quality of the recording medium, provided it is adequate to retain the digital values without error.
Digital mediums capable of bit-perfect storage and retrieval have been commonplace for some time, since they were generally developed for software storage which has no tolerance for error. In the case of the Compact Diskhowever, the error recovery system used traded some reliability for more space on the disk to allow more recording time.
Still, it is extremely common for them to read with no errors unless they have been mishandled or have degraded due to poor manufacturing methods. The process of analog-to-digital conversion will, according to theory, always introduce quantization distortion.BK - - timberdesignmag.com Foreword In many common areas of application, a weighing instrument or the weight it measures is just a means to an end: The value that is actually sought is calculated from the weight or mass that was.
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COMPARISON BETWEEN RADIO AND TV BROADCAST:The Difference, Script Introduction to Broadcasting Mass Communication.
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