MUST 1220 Lecture Notes - Lecture 8: Binary Number, Observational Error, Multiplexer
30 Jan 2017
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Fun fact: the first digital masters were stored on video tape as fake video signal in which sample values, represented as binary numbers with digits of 1 & 0, are stored as video levels of (cid:271)la(cid:272)k a(cid:374)d white. That"s whe(cid:396)e the 44,100 samples per second came about and it just stuck when finally moved over to cds. Dither is low-level noise added to the audio signal before it is sampled. It adds a level of random error to the signal, transforming the quantization distortion into added noise. Dither trades one problem for a lesser problem. Without dither, digital recordings would be far less satisfactory than analog allowing resolution below the least significant quantization bit. In summary, dither is low-level noise added to the sampling to reduce quantization error distortion. (cid:862)upsampling(cid:863) = i(cid:374)(cid:272)(cid:396)easi(cid:374)g (cid:271)it depth fo(cid:396) (cid:272)la(cid:396)ity (cid:862)downsampling(cid:863) = lowe(cid:396)i(cid:374)g (cid:271)it depth fo(cid:396) usa(cid:271)ility.
