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| digital signal processing | |
| signal processing | |
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In Signal Processing , the sinc filter strips high-frequency data from a Signal . It is based upon the Sinc Function . Many physical processes are subject to Noise . For instance, reception of an ordinary music radio is rarely crystal-clear, telephones don't transmit a perfect sound and old pictures get scratched or lose some of their colors. One method of minimizing such defects is to Filter the sounds and images, to remove obvious noises and scratches. At this point it is unfortunately impossible to create filters that restore a signal to its pristine original self, but we have a starting point, and that is the sinc filter. The sinc filter presumes that noise will be (in audio signals) principally high-pitched. The idea is that most people don't produce very high pitched sounds, so if we remove all high-pitched sounds from a telephone conversation, we are ''probably'' removing ''mostly'' noise, and the conversation is unhindered and perhaps improved. TECHNICAL DISCUSSION
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