CAS CS 101 Lecture Notes - Lecture 3: Electronic Filter, Sp1 Transcription Factor
7 Jan 2018
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Document Summary
Conversions: taking a thing you want to save and converting it to binary, analog-to-digital conversion (a/d, typically, an electronic chip will do the conversion. Analog vs digital: analog can vary continuously, digital jumps between levels instead of being continuous. To go from analog to digital: get the value closest to the line, then connect the dots, the more samples, the more accurate, but that also means the more you have to store. Cd audio: each sample is 16 bits (2 bytes) long, two sample streams one for each side in a stereo recording, a typical song is about 32 million bytes (32 mb) long. Compression: there are two kinds of compression, lossless exactly reproduces the original version from the compressed file, lossy accepts some loss of quality in return for a much smaller file. Lossy compression: lossy compression removes unnecessary parts of the original to reduce its size, music example: take out notes too high/low to hear.
