PPT-The Decibel

Subjects Covered The bel and decibel units Relative Power Gain Relative Voltage Gain dBm and Absolute Power Gain The bel and decibel units Derived from how a received signal is perceived Specifically by the human ear. 1 DECIBEL dB The Decibel is a subunit of a larger unit call ed the bel As originally used the bel represented the power ratio of 10 to 1 betwe en the strength or intensity ie power of two sounds and was named a fundamental frequencymeasure: Hertz (Hz) intensitymeasure: decibel (db) speech gesturesduration of segmentsmeasure: millisecond (ms) articulatory precisionspectral qualitymeasure: formant values in ng phon curve. To create an 80-phon curve, subjects were Noise Abatement Program Manager. INTERSTATE 95 EXPRESS LANES . FUNDAMENTALS OF TRAFFIC NOISE. 2. WHAT IS NOISE?. Noise is unwanted sound.. It is perceived differently by every person.. Can be irritating to one person may be tolerant to another.. Noise Levels . Ear . plugs and/or muffs will be worn whenever personnel may be exposed to excessive noise levels as determined and designated by the Safety & Health Services . Department. Hearing . Abby Bault – Center Line. Amanda Hercula – Warren Mott. . Table of Contents. Background. Problem. Hypothesis. Materials and Procedures. Data Collected. Statistical . Tests. Conclusion. Errors Made. Kaegan Gregory. Overview of Prior Research. Every concert hall is unbalanced. Acoustic engineers adjust acoustics in concert halls. Sound shells. Sound Reflectors. RCHS auditorium adjusted with sound reflectors. Michael Maddox (MIT CSAIL), David Goehring (MIT CSAIL), Aaron J. Elmore (University of Chicago), Samuel Madden (MIT CSAIL), Aditya Parameswaran (University of Illinois), Amol Deshpande (University of Maryland). Pain. Damage. }. Constant exposure . leads to permanent hearing loss.. The chart below lists the approximate sound levels of various sounds. The loudness of a given sound depends, of course, on the power of the source of the sound as well as the distance from the source. Note: Listening to loud music will gradually damage your hearing!. 13.1 – Sound Waves. Objectives. * Explain how sound waves are produced. * Relate frequency to pitch. * Compare the speed of sound in various media. * Relate plane waves to spherical waves. * Recognize the Doppler effect, and determine the direction. Lecture 2. ET065G 6 . Credits. ET064G 7.5 Credits. Muhammad Amir Yousaf . Frequency Response of R,L,C. How varying frequency affects the opposition offered by R,L and C. Chapter 26. Filter – a device that removes or “filters” or attenuates unwanted signals, and keeps (and sometimes magnifies) the desired frequencies. Attenuation – opposite of gain and magnification. To shrink or remove.. Noise Levels . Ear . plugs and/or muffs will be worn whenever personnel may be exposed to excessive noise levels as determined and designated by the Safety & Health Services . Department. Hearing . 1. Which statement accurately describes the mathematical relationship between the intensity of a sound and the decibel rating?