Decibel Soundboard

HERTZ LEVEL 1,000 5,000 10,000 15,000 20,000 25,000 30,000 35,000 40,000 45,000 50,000 55,000 60,000 90,000 100,000 150,000 YOUNG ADULT ELDERLY GUINEA PIG MOUSE WHALE DECIBLES FREQUENCY EQ FLAT НИННИНИ !31 170 170 160 160 150 150 140 140 130 130 120 120 110 110 100 100 90 90 80 80 70 70 60 60 50 50 40 40 30 30 20 20 10 10 JACKHAMMER CAR TRAFFIC WHISPER LAWN MOWER GUN SHOT HAMMERING ALARM CLOCK JET ENGINE NORMAL TALKING ROCK CONCERT ORCHESTRA OBJECT DECIBELS The decibel's logarithmic nature means It's commonly used in acoustics to that a very large range of ratios can be quantify sound levels relative to a 0 represented by a convenient number, in dB reference which has been defined The decibel (dB) is a logarithmic unit that indicates the ratio of a physical quantity a similar manner to scientific notation. as a sound pressure level of .0002 This allows one to clearly visualize huge (usually power or intensity) relative to a specified or implied reference level. A ratio in decibels is ten times the logarithm to base 10 of the ratio of two power quantities. A decibel is one tenth of a bel, a seldom-used unit. The decibel is used for a wide microbar. The reference level is set at changes of some quantity. the typical threshold of perception of an average human and there are common comparisons used to illustrate different levels of sound pressure. As with other decibel figures, normally the ratio is a variety of measurements in science and engineering, most prominently in acoustics, power ratio rather than a pressure. electronics, and control theory. In electronics, the gain of amplifiers, attenuation of signals, and signal-to-noise ratios are often expressed in decibels. SENSING SURVIVAL The Sense of Hearing