EECS 1520 Study Guide - Midterm Guide: Audio File Format, Bit Rate, Decompression Practice

• School: York University
• Department: Electrical Engineering and Computer Science
• Course: EECS 1520
• Professor: John Hofbauer

Document Summary

Digital media: representing audio, images, and videos in a computer system. Microphone is a transducer, converting audio (sound waves) to electrical signals. Digitizing sound involves taking samples (measurements) at a fixed rate (sampling rate) Too slow inaccurate: low sampling rate reproduces a sound (red) that does not match the original frequency (blue) Sampling the wave at discrete intervals, sample is the height of the curve at the time. Convert analog to digital (each point will be a number x number of sampling points) Each sample is a fixed size, called bit depth. Higher bit depth means a more accurate sample: red (original), black (sampling), green (difference) Combining bit depth and sampling rate gives a bit rate. Higher bit rate = better quality = larger file size. Range of human hearing: 20 hz 20 khz. 16 bits bit depth (per channel, stereo has 2 channels) Uncompressed audio typically saved in a . wav format.