Computer Science 1033A/B Lecture Notes - Lecture 13: Sound Card, Lossy Compression, Sound

• School: Western University
• Department: Computer Science
• Course: Computer Science 1033A/B
• Professor: Laura Reid

Document Summary

We rely on sound to enhance multimedia applications. Create your own sound: recording program, recording studio with equipment, electronic instrumentals such as synthesizers. Visualize the sounds as a series of recurring waves called a waveform. Volume: the higher the wave the louder the sound. Pitch/frequency: the closer together the waves the higher the pitch. In a multimedia application, sound must be in a digital form (string of 1s and 0s: to convert analog sounds to digital sounds, thousands of samples are taken of the sound waves and recorded as bits. Computers have a sound card which concerts the sound wave from a microphone(analog to digital) Laptops rarely have a sound card because manufacturers incorporate sound circuitry into system board. Sound card has: adc analog to digital converter for recording, dac digital to analog converter for playing audio. Quality of sound is dependent on the following criteria: sample rate, sample size, channels, codecs.