C_S_D 3220 Lecture Notes - Lecture 4: Tuning Fork, Sound Energy, Laserdisc
Document Summary
What is acoustics: main focus of our text & class, difficult to understand without considering physiology & perception, acoustic signal of speech. Physical event that is transmitted in telecommunications or is recorded on magnetic tape, laser disc, etc. If we store speech: we do so on basis of the acoustic signal. If a tree falls in the forest, but there is no one to hear it, does it make a sound? . Science man tells us about sound http://www. youtube. com/watch?v=_ vyyqrvi8vy. Plus excellent skills in amplification & finding the right pitch http://www. youtube. com/watch?v=yg8k0yl4_hc. Looking at a waveform: a now a word from a friendly sound technician http://www. youtube. com/watch?v=cejknjdkcvc&feature=fvwrel. One complete cycle is the vibration of the tuning fork back and forth (one time) The time required to make that one cycle is called a period. Frequency of vibration is the number of cycles per second. Number of cycles per second is hertz (hz)
