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Lab Sound Recording 1

This document discusses sound frequency, pitch, and principles of sound recording. It defines key terms like frequency, pitch, the Doppler effect, sound refraction, reflection, and diffraction. It also provides examples of recording sound in different environments like a bathroom, near a road, and in a corridor. Recordings in the bathroom had echo due to hard surfaces, while recordings near a road captured traffic noise and the Doppler effect. Recordings in the corridor had little reverb due to the small space. Overall, the document examines concepts and factors involved in sound frequency, principles, and ambient recordings in various locations.

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79 views4 pages

Lab Sound Recording 1

This document discusses sound frequency, pitch, and principles of sound recording. It defines key terms like frequency, pitch, the Doppler effect, sound refraction, reflection, and diffraction. It also provides examples of recording sound in different environments like a bathroom, near a road, and in a corridor. Recordings in the bathroom had echo due to hard surfaces, while recordings near a road captured traffic noise and the Doppler effect. Recordings in the corridor had little reverb due to the small space. Overall, the document examines concepts and factors involved in sound frequency, principles, and ambient recordings in various locations.

Uploaded by

api-480491536
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Download as PDF, TXT or read online on Scribd
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LAB Sound recording 

 
 
Sound frequency and pitch:  
 
Frequency is defined as how many times sound waves cycle up and 
down per second. This is also the amount of waves that reach a point 
every second. Frequency is measured by the unit hertz (Hz).  
 
Many people can not hear a high-pitched tone above 20 kHz; 

Lower frequencies have longer wavelengths and high frequencies 


have short wavelengths. The lower frequencies are known as bass, high 
frequencies are known as treble. 
 

 
  
 
 
 
 
 
 
 
 
 
Pitch is defined as how high or low a sound is. For example , if your 
voice is deep then it has a low pitch however, if your voice is high 
then it has a high pitch. A low pitch has a low frequency sound 
wave and a high pitch has a high frequency sound wave. 
 
Principles of sound:  
 
❏ Doppler effect 
❏ Sound refraction, reflection and diffraction 
 
 
The ​doppler effect ​is defined as the 
apparent change in the frequency of a 
wave caused by the relative motion 
between the source of the wave and the 
observer. For example, when a source of 
sound moves towards the observer there is 
an increase in the frequency of sound.  
 
Sound refraction ​refers to the change of 
speed when a sound wave passes from a 
medium to another medium. So, when it 
passes through a medium it changes the 
direction of the sound wave at no greater 
than 1 degree. 
 
Sound reflection ​is when sound travels 
through a medium and strikes the surface of 
another medium and bounces back to the 
initial medium. This produces echo and 
reverberation and it obeys the laws of 
reflection. 
 
Sound diffraction ​refers to the bending and 
spreading of waves around an opening or 
a gap. However, diffraction all depends on 
the wavelength and the size of the 
opening.   
 
Different sound altitudes 
 
At higher altitudes, the sound waves travel more slowly mainly because 
of the small number of molecules. That being said, if you increase the 
height of the amplitude the louder the sound will be and if you lower 
the amplitude the quieter the sound is overall. 
 
 
 
Sound recordings  
 
Bathroom 
I recorded in the bathroom and the sound is reflecting on the walls causing 
an echo off of the hard surfaces. This makes the sound appear louder, yet 
makes dialogue not as clear. If I move the microphone around the sound is 
still being recorded consistently. The frequency of the sound gets lower as 
you move further away from the microphone on my phone. It has a high 
quality of audio when the sound is at a close distance to the microphone. 

 
 
Near a road 
I recorded all the ambient noises outside my house, on the road. In this 
recording, you can hear many vehicles driving past the microphone on my 
phone. In the microphone, you can also hear the doppler effect as well as 
people conversing in the background however, dialogue is not very clear in 
the recording. On top of this you could hear the wind which was not present 
in the recording due to the powerful ambient noise of the vehicles. Pitch and 
frequency in this sound recording is optimal for a dialogue in the outdoors. 
 
 
 
 
 
 
 
 
 
Corridor 
I then proceeded to record sound in my corridor, at home. I decided to 
record myself speaking into a microphone on my phone. Where the 
ceiling is not too tall this means that there is very little reverb and 
reflection mainly because the sound waves have a small surface area 
to bounce off as it also absorbs audio. Furthermore, this makes the 
sound feel very restrained instead of having lots of echo in the 
recording compared to if there was a large space. The frequency and 
pitch of the sound are high quality and can also be beneficial for 
indoor dialogue. 

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