WITS_Mining_Hearing & Noise Test_Pathy Muke.

May 03, 2026 21:52 · 15:36 · English · Whisper Turbo · 3 speakers

یہ نقل ختم ہو جاتا ہے 20 دن. دائمی محفوظہ کے لئے بہتری →

Lecture Index

0:10

S… Speaker 1 (WITS_Mining_Hearing & Noise Test_Pathy Muke.)

Hello, welcome to the GenMe lab. I'm Pathy Mukhe, my postcard student in the School of Mining Engineering. Today, I'm your lab demonstrator for this demonstration called Noise and Hearing Lab demonstration. Mining industry is a very noisy environment, mainly because of the massive, huge equipment and machinery used for drilling.

0:35

S… Speaker 1 (WITS_Mining_Hearing & Noise Test_Pathy Muke.)

blasting, transportation of mineral materials, as well as ventilation of underground mines. The nature of being highly mechanised is a permanent source of louder noise, which is an inherent health hazard to workers. The exposure to noise levels above regulatory recommended limits can adversely affect the daily lives of mining workers.

0:59

S… Speaker 1 (WITS_Mining_Hearing & Noise Test_Pathy Muke.)

Therefore, it is important to everyone in the mines to be able to hear the alerts instructions and answer the sound in the case of an emergency. For that reason, all mining workers are subject to go through a regular hearing test to prevent any harm or accident.

1:18

S… Speaker 1 (WITS_Mining_Hearing & Noise Test_Pathy Muke.)

as part of health and safety in the mining place. I'm not a specialist in hearing tests, but I'm here to show students how to measure the hearing ability of a person and how to interpret the result based on some standard norms. It is important to note that hearing loss is preventable when it is detected earlier.

1:40

S… Speaker 1 (WITS_Mining_Hearing & Noise Test_Pathy Muke.)

and prevention can be achieved by eliminating noise sources and also using appropriate personal protective equipment. The purpose of this lab is to perform an orthometric threshold measurement across a range of frequencies on fellow students and also from the information collected undertake preliminary.

2:05

S… Speaker 2 (WITS_Mining_Hearing & Noise Test_Pathy Muke.)

categorization and calculate the binaural and mono hearing impairment and finally issue an overall assessment about the hearing ability of a person. Let's now describe the apparatus. The hearing test requires the use of the following apparatus. The audiometer device which is used to produce a pure sound beep and to change or control the intensity of the sound in decibels with this

2:34

S… Speaker 2 (WITS_Mining_Hearing & Noise Test_Pathy Muke.)

two buttons and also to change and control the frequency of the sound in hertz. It is connected to a pair of headset and a feedback button or responder. So the headset is used to receive the sound signal from the audio meter device and send it through the ears of the patient are being tested and the responder is used.

3:02

S… Speaker 2 (WITS_Mining_Hearing & Noise Test_Pathy Muke.)

to send back the light signal to the audiometer machine when responding to the sound beep. Beside of this, we also use the soundproof board to prevent the surrounding noise, to disrupt the sound beep and also to disturb the person being tested. Let's now talk about the procedure of the hearing test. I'm now going to invite Malouse to come in and he will be the person who will be tested for the hearing test. So first of all,

3:33

S… Speaker 3 (WITS_Mining_Hearing & Noise Test_Pathy Muke.)

We need to make sure that any head ornament and eyeglasses, hearing aids that might affect the acoustical test of the demonstration should be removed and also the hair should be fastened at the back of the head so that it does not become trapped between the headset and the ears of the person being tested. The first step is to let the patient

4:05

S… Speaker 2 (WITS_Mining_Hearing & Noise Test_Pathy Muke.)

enter into the soundproof booth, put on the headset, and make sure that the red lead goes to the right ear and the blue lead goes to the left ear. And the person will be sitting inside holding the response or the feedback button. Step one is to adjust the frequency of the sound at 500 hertz. And step two, also set up the intensity of the sound.

4:36

S… Speaker 1 (WITS_Mining_Hearing & Noise Test_Pathy Muke.)

at a dial rating of 50 decibels. This is to allow the person to hear the sound at the outset of the hearing threshold determination. It's also important to note that if the person doesn't respond to the sound when it is first presented at 50 decibels.

5:00

S… Speaker 1 (WITS_Mining_Hearing & Noise Test_Pathy Muke.)

we should consider to increase the intensity of the sound at 80 decibels. The test starts with the left ear and then the right ear. So for me to send the sound to the left ear, I'm going to press this button and the light coming up saying that the tone has been sent to the headset. So if I send the tone and then if it's able to hear that sound, it's going to respond by pressing the feedback button.

5:31

S… Speaker 1 (WITS_Mining_Hearing & Noise Test_Pathy Muke.)

and the light signal will be showing up. Currently, the response is not working because I can't see any light from the patient, but I can see him pressing. When he presses and responding to the sound beep, I have to decrease now the intensity of the sound in steps of five. So I'm sending the sound. This is for 50 decibels, and I can see he's pressing, and I must decrease it.

6:01

S… Speaker 1 (WITS_Mining_Hearing & Noise Test_Pathy Muke.)

in steps of five, so 45 decibels, and understand the tone is still responding, so I keep decreasing the intensity of the sound until it fails to respond. The last time it's going to respond, at that time determines the hearing threshold at that specific frequency.

6:27

S… Speaker 1 (WITS_Mining_Hearing & Noise Test_Pathy Muke.)

test first for the left here and then the right here and the range of frequencies include 500 all the way to 6,000 and this range of frequencies is divided in two groups we have low frequencies from 500 to 2,000 Earth and high frequencies from 3,000 to 6,000 I'm trying to find

6:56

S… Speaker 2 (WITS_Mining_Hearing & Noise Test_Pathy Muke.)

The threshold at 500 hertz. So I'm decreasing the intensity. I'm sending 40 decibels, still responding. I decrease to 35, sending, responding. 30, still responding. 25 decibels, still responding. 20, I can see it's pressing. 15, still responding. 10.

7:28

S… Speaker 1 (WITS_Mining_Hearing & Noise Test_Pathy Muke.)

I don't see me responding. So 15 represents the hearing threshold at 500 Hz. So now I'm going to increase the frequency of the sound by pressing this button to 1000 Hz and then I set back the intensity of the sound at 50 decibels. So I take it back to 50 and send again the sound beep. I can see me responding.

7:57

S… Speaker 2 (WITS_Mining_Hearing & Noise Test_Pathy Muke.)

I decrease in steps of 5 to 45. I send the beep. He's still responding. 40. He's still responding. 85. 30. 25. 20. 15. 10. 5. He's not responding at 5. So the last time he responded.

8:25

S… Speaker 1 (WITS_Mining_Hearing & Noise Test_Pathy Muke.)

is 10 decibels. So 10 decibels represent the young threshold of Marluse at 1000 Hz. And I increase again the frequency of the sound.

8:37

S… Speaker 1 (WITS_Mining_Hearing & Noise Test_Pathy Muke.)

to 2,000 and take down the intensity to 50 and start again over. I can continue throughout the range of frequencies until I reach 6,000. But it should be noted when the person responds at zero decibel, this represents the softest sound of people with normal hearing should be able to pick up 50% of the time. And for the sake of hearing calculation,

9:06

S… Speaker 1 (WITS_Mining_Hearing & Noise Test_Pathy Muke.)

Instead of recording zero, we rather record one. And these information are recorded in the hearing loss table for the left ear and the right ear. We are done with the hearing test and we're going to call Malusi to come out. So I'm going to open for him. Please come out. Thank you very much. Your hearing is very good. Thank you. So now we are going to present the information collected.

9:39

S… Speaker 1 (WITS_Mining_Hearing & Noise Test_Pathy Muke.)

and also to analyze the hearing level of malusine. First of all, the hearing test produces a graph called audiogram that displays the hearing ability of the patient being tested. So we're going to draw or plot the dots in the graph.

10:00

S… Speaker 1 (WITS_Mining_Hearing & Noise Test_Pathy Muke.)

and connect those dots from the left ear and also from the right ear. So it will show us two lines, the red one for the right ear and the blue one for the left ear. By looking at that graph, we can give an overall assessment of the hearing ability of Malouse, whether it's normal hearing, warning hearing level, or referral hearing level.

10:28

S… Speaker 1 (WITS_Mining_Hearing & Noise Test_Pathy Muke.)

We are now going to calculate the percentage binaural hearing impairment of Malusse using the binaural hearing impairment table. We've recorded the information for the left ear and the right ear. So the binaural hearing impairment calculation is only conducted for low frequency, 500, 1000 and 2000 hertz. So we know at 500 the threshold was 15, 1000 was 10.

10:59

S… Speaker 1 (WITS_Mining_Hearing & Noise Test_Pathy Muke.)

and 10 again for 2,000. This is for the left here, and for the right here, it was 15, 15 again, and 10, 2,000. And I get the sum of this year threshold for the left here and the right here. For the left here, I got 35, and for the right here, I got 40. And divide by three, subtract 26, and multiply by 1.5.

11:29

S… Speaker 1 (WITS_Mining_Hearing & Noise Test_Pathy Muke.)

the percentage of the year for the left year and the right year. At that point, we can see which year has a normal or better year compared to the other one. So from the side, we have a smaller percent that represents the better year. And from the better year, we're going to multiply by five and add now the two results.

11:59

S… Speaker 1 (WITS_Mining_Hearing & Noise Test_Pathy Muke.)

and then divide by six to get the percentage binaural hearing impairment. So by doing so, we want to assess the hearing ability of Maluse. We compare the result with the standard norms given in the audiogram classification or categorization. We know that before Maluse going inside, we coded the

12:29

S… Speaker 1 (WITS_Mining_Hearing & Noise Test_Pathy Muke.)

the age of the patient and let's assume Maluse is under 24. We compare the sums we calculated from low frequencies and high frequencies with this limit. So if all the two sums for low frequencies and high frequencies on the left here and the right here are below or equal to 45

12:57

S… Speaker 1 (WITS_Mining_Hearing & Noise Test_Pathy Muke.)

the hearing level should be considered as normal and Malusi should be allowed to go to the mine. But if between 45 and 60 for the low frequencies, Malusi has reached the owning level and we should provide him the hearing aid to amplify the sound when going to the mine. But when it succeeds,

13:25

S… Speaker 1 (WITS_Mining_Hearing & Noise Test_Pathy Muke.)

60 for low frequencies either for left ear or right ear, that's the referral level. It shouldn't be allowed to go to the mine. Rather, it should be referred to a doctor for additional hearing evaluation. The hearing result is analysed according to the binaural hearing impairment.

13:52

S… Speaker 1 (WITS_Mining_Hearing & Noise Test_Pathy Muke.)

according to the practical levels of hearing evaluation and also according to the audiogram classification categorization with reference levels for different age groups. For the practical levels of hearing evaluation, we just have to compare the information recorded to the practical guide levels for hearing evaluation. Given this table, when we have different

14:22

S… Speaker 1 (WITS_Mining_Hearing & Noise Test_Pathy Muke.)

levels of hearing whether it's normal when the hearing loss is less or equal to 25 and there is a slight loss where it's between 26 and 40 between 41 and 55 that should be regarded as mild loss 56 and 70 marked loss

14:48

S… Speaker 1 (WITS_Mining_Hearing & Noise Test_Pathy Muke.)

71 and 90, there is a severe loss. Greater to 20 and 91 should be regarded as extreme loss. But the result we got from Alose shows...

15:00

S… Speaker 1 (WITS_Mining_Hearing & Noise Test_Pathy Muke.)

us that the hearing level of malusia is normal. That concludes the hearing test and I think you should be able to also perform a hearing test and interpret the result and assess if the patient is able to or is fit to go to the mine or not based on what we've just done. Thank you.

This transcript was generated by AI (automatic speech recognition). May contain errors — verify against the original audio for critical use. AI policy

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