this is the whole set of impedance tube that will be used for measuring sound absorption of materials we have

generator we have a amplifier we have a computer we have a tubes okay this is the the channel impedance - okay so this

is the absorption tube so we have a microphone a microphone B sample will be put in here right this is the amplifier

amplifier and this is the generator this generator produce sound and will be amplified by the amplifier and then

channel to the tubes all right so the generator will be connected to the to the

channel policy microphone a and B so this is called channel 3 channel 4 and the computer

we're the embedded software install here we need a blood connection it must be corrected

[Music] and we have the dog girls and forget the dog

the software [Music] this one

[Music] and make sure that you're doing the large sample this one must be point IDI

[Music] there is a Bundy but juices we use Lodge to lodge the

your Lodge do [Music] double-click it there you go

the [Music] what if all that

don't worry about that so before we spread the measurement make sure that we do the project set up here

projects it up we have [Music]

so we have to do [Music] measure mine

generate the environment of in front in so do pick one by one the tube because by using

[Music] so we select large one [Music]

in hundred which would bring the generate you just send them

no level [Music] pressure

[Music] would then all the same to me

plus-minus - okay then so this is the important one front end make sure that we have a slot number one

force signal microphone a so this is microphone a microphone be microphone the game will be connected by channel

three this is channel 3 channel 3 Oh the transistors number transistors number is the lava inside here we have a

number here [Music] gentlemen

[Music] [Music] is the number of sentences

[Music] [Music] for forward instead

Oh easy [Music] so both of them is for itself 187

Genesis and then the serum 175 do

[Music] brisk [Music]

first okay okay for the next step is channel calibration a pressed channel calculation all right

this is the calibrator and we will calibrate the microphone so this is the microphone a and B so we are going to

calibrate over so [Music]

gotta strike [Music] [Music]

we use a metaphor [Music] just the other one

[Music] good calibrate the other one [Music]

[Music] we go to the next step [Music]

can we go to the [Music] signal-to-noise ratio just

[Music] so this is the interface okay make it larger so now we will measure the

background ice in the still competitive no I promise just press that [Music]

[Music] single measurement [Music]

[Music] [Music] now we are finish the signal-to-noise

ratio here this is the background noise and this is the signal-to-noise ratio now we need to transfer function

calculation [Music] the place

make it larger create the change in my microphone positions right so we need to interchange the microphone it will be

and lead to a right [Music] [Music]

change the position [Music] okay

[Music] [Music] get it

[Music] you know a violin [Music]

be valid LRH also right replaces the calibration measurement gameplay yes okay let's pick up a microphone position

change gain [Music]

[Music] okay that's that

[Music] [Music] that

[Music] Oh so exci pilots please it's okay

that initial signify by the sale of range [Music]

okay [Music] yes

[Music] [Music] we did the sample here right

[Music] referenceable get this do the measurement for the our reference sample

so now click measurement right there you go okay

let's see we named the sample reading is a reference for today 14 November

[Music] at edits at the directory rest up

[Music] [Music] it

[Music] she'll be weekend [Music]

this is a business experiment suit it off to get me ready is this already

[Music] [Music] it's already here

that already see suction coefficient you want to see the to result

this is do you did not what we want they form a good to the post-processing okay in the past put post-processing

click large because we use clutch [Music] go to the extraction sorry

[Music] click the reference [Music]

extra district they would extract a Lolita to see the results

click project setup [Music] [Applause]

it affects [Music] is here the

please [Music] so that's

straight destruction so there you go

Makati the value of the reference sample so here the DP divided by r100 we need to change it to the Linea okay

can see here okay then change once again to D to get the coefficient coefficient between 0 to 1 so change the number

format traffic's so there you go we have the new reading all right the new reading the reading so

double-click it on your right right click get the copy active curve right then export it to the Excel peseta Excel

a clear excel this year right then delete the in folder we don't want actually the large sample is between 50

Hertz to 160 so we need to remove below 50 so here we have that 50 we really wonder reading from 5 0 0 e exponent 0 1

is well with the 50th before we did it it que Rico so change it for the next time

we change it to din number click ok alright so we can party instead [Music]

so this is our reference sample so can name it as referral sample reference sample

simple so so this is the reference sample okay

[Music] do we need to compare reading from our reference sample they

then do given by the manufacturer for the year but he reference puns so this is the reading probably manufacturer so

we can compare if it is similar so meaning that the reading is okay the first one is the first one from the

sample is reference sample is 0.04 0.04 here we got 0.02 the second one is 0.01 80 minus 0.05 and so on the highest is

zero point two nine zero point two four zero point nine is small disparity so we consider our impetus of reading can be

used for the test so we have a sample here concrete example for us complete sample

all weed click the measurement to create a new file you say concrete quit

then eight and press for the measurement [Music] again to see the result

this section Construction much senator

one just not either or not in here see there will be lunch he can see the

concrete and click the concrete and then straightener II the city Lisa Kudrow

Oh Joe set up can see here result is right

there you go Theresa keep the change the this

it's [Music] very high

if good their keep Verde

[Music] we won from the [Music]

five-0 [Music] okay you got it we got this

then change the de number there the father this body number okay so you go sorry happy

so the highest is at 400 be so you can plot it do the comparison

blood eat [Music] from the dispatch for example and this

is for concrete there you go by [Music]