Sound Essay, Research Paper

Decibels are the units of measuring used to depict electromotive force and power degrees. The abbreviation for a dB is dB ( Sauvala ) . Some decibel comparings are: 10 dubnium is about every bit loud as person rustle, 70 dubnium is a yelled conversation, and 110 dubnium is every bit loud as a jet engine ( & # 8220 ; Sound & # 8221 ; ) . Decibels are the looks of ratios. Some expressions for dBs are power =10log ( P1/P2 ) ( P1= power 1 and P2= power 2 ) and electromotive force =20log ( v2/v1 ) ( V2= electromotive force 2, V1= electromotive force 2 ) ( jgoldste @ wyoming.com ) . Decibels are measured by 6 & # 8217 ; s. For illustration, 6 dubnium is twice the original value ( 0 dubnium ) and -6dB is? of the original value ( 0 dubnium ) ( Sauvala ) . O dubnium is the lower limit a human can hear and 140 dubnium is the threshold of hurting for a human ( Freedom ) . Decibel means the measuring is a ratio measured on a logarithmic graduated table and whenever you add 6 dB the electromotive force doubles ( BBC Online ) . The mean human ear can non detect dB alterations of less than one dB ( malcolm @ mcs.net ) . Every clip the distance from a sound beginning doubles, there is a bead of 6 dubnium and the expression for this is DC= 20log ( distance1/distance2 ) ( DC= dBs of alteration ) . You round dBs to the 1s topographic point ( Mc Squared System Design Group ) .

There is merely one dB system, but there are two ways to show values & # 8211 ; power dBs and electromotive force dBs. Power dBs are used to show sound force per unit area degrees and power A and talker specifications. They are used for equipment that translates signals back to sound and to person & # 8217 ; s ears for hearing. Voltage dBs are used to show addition, loss, degrees, noise, and line equipment specifications. These are used in most equipment that pick up sounds, converts them to electrical signals and sends them from one point to another. Both of these can be converted to each other. If you have power dubnium all you have to make is duplicate it to acquire voltage dubnium and if you have voltage dubnium than you take half of that for power dubnium ( malcolm @ mcs.net ) .

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Sound has three mensurable parts: frequence, amplitude, and continuance. Frequency is the rate of quiver that determines how high or low the pitch is. & # 8220 ; Amplitude is the magnitude of the quiver, which determines how loud the sound is. & # 8221 ; ( Freedom ) Duration is how long the sound lasts, measured in seconds.

Sound soaking up is the effectivity of a stuff at forestalling the transmittal of sound. The expression for sound soaking up is A= .921Vd/c ( V= volume of room, d=the measured rate of decay in dBs per second, and c=the velocity of sound ) . Another manner of mensurating the effectivity of soundproofing is by mensurating the Sound Transmission Loss ( SLT ) which

is the effectivity of a wall at forestalling sound from acquiring from one side to the other. The expression for this is STL= L1- L2+10log ( s/a ) ( Freedom ) ( STL= sound transmittal loss, L1= beginning room sound degree, L2= beginning room sound degree, 10 log ( S/A ) = rectification for soaking up )

STC values are based on the figure of dubnium of transmitted sound reduced by a wall. An illustration of STC values is that 50 dubnium is four times louder than 30 dubnium and 50 STC is four times quieter than 30 STC ( Nash, Sound Control ) . Some merchandises that will assist increase the STC include: absorptive mat, barrier stuff, neoprene quiver strips, resilient channel, and sound control insularity. & # 8220 ; Resilient Channel is a thin metal channel designed to well better the sound insularity of wallboard, Sheetrock, and gypsum board walls and ceilings. & # 8221 ; ( Nash, Soundproofing ) Use of resilient channel normally consequences in an STC addition of 3 to 5 points. & # 8221 ; ( Nash, Soundproofing ) . Just basic wall with he-mans and wallboard with no caulking has an STC value of 30. When you add calking the value goes up to 35 and if you add dual wallboard on one side it becomes 37 ( Nash, Sound Control ) .

Bibliography

BBC Online. & # 8220 ; What is a dB ( dubnium ) ? & # 8221 ; ( 4 December 1999 ) : n.pag. On-line. Internet. 4 December 1999. Available WWW hypertext transfer protocol: //www.bbc.co.uk/info/reception/tv_recep/db.shtml.

Encarta 96. & # 8220 ; Sound & # 8221 ; CD-ROM. Microsoft: Microsoft Corp. , 1996.

& # 8220 ; Freedom From Distraction & # 8221 ; ( 3 December 1999 ) : n.pag. On-line Internet. 3 December 1999. Available WWW hypertext transfer protocol: //www.hufcor.com/acoustics/acoustpage.html.

Jgoldste @ wyoming.com. & # 8220 ; Decibels, What are They? & # 8221 ; ( 16 April 1996 ) : n.pag. On-line. Internet. 10/10/99. Available WWW hypertext transfer protocol: //www.biotelem.org/decibel.htm.

malcolm @ mcs.net & # 8220 ; The Decibel System & # 8221 ; ( 5 December 1999 ) : n.pag. On-line. Internet. 5 December 1999. Available WWW hypertext transfer protocol: //www.mcs.net/~malcolm/fulldb.txt.

Mc Squared System Design Group. & # 8220 ; Decibels and Distance & # 8221 ; ( 5 December 1999 ) : n.pag. On-line. Internet. 5 December 1999. Available WWW hypertext transfer protocol: //www.mcsquared.com/dbframe.htm

Nash, Bill & # 8220 ; Sound Control of Walls & # 8221 ; ( 5 December 1999 ) : n.pag. On-line. Internet. 5 December 1999. Available WWW hypertext transfer protocol: //www.soundproofing.org/infopages/soundwalls.html.

Nash, Bill. & # 8220 ; Soundproofing Walls Using Resilient Channel and Acoustical Mat & # 8221 ; ( 5 December 1999 ) : n.pag. On-line. Internet. 5 December 1999. Available WWW hypertext transfer protocol: //www.soundproofing.org/infopages/channel.htm.

Sauvala, Jorma. & # 8220 ; The Confusion & # 8221 ; ( 1998-1999 ) : n.pag. On-line. Internet. 10/10/99. Available WWW hypertext transfer protocol: //www.ews64.com/mcdecibels.html.

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