Presentation about sound frequency for the coursera course "Introduction to Music Production"

1. Yves Jans

2. Who am I ?
Hi, I’m Yves from Belgium
I’m going to give some info regarding sound frequency
Headphones recommended

3. Audio Frequency
Periodic vibration
Pitch of sound
How often a wave repeats within a fixed amount of
time
Measured in hertz (Hz)
Heinrich Rudolf Hertz

4. Human hearing
Humans can hear frequencies between 20 and 20.000
Hz (20 kHz)
The older a person gets the less frequencies one can
hear
Hear damage can also be caused by exposure to loud
music/sound
Which ones can you hear ?
https://www.youtube.com/watch?v=H-iCZElJ8m0

5. Animal hearing
Animals can often hear other frequency levels and/or a
wider range
Dogs: 40 Hz – 60 kHz
Cats: 55 Hz – 79 kHz
Bats: 1 kHz – 200 kHz

6. Wavelength
Sound propagates as longitudinal waves in air
But sound waves are most often represented as a
transverse wave:

7. Wavelength
The wavelength of a sound with a 20 Hz frequency is 17
meters
This explains why you mostly hear bass (low frequency
sounds) from a distance when a party/festival is going
on

8. Wavelength
The wavelength of a sound with a 20 kHz frequency is
1,7 centimeters

9. Wavelength
A 1500 Hz frequency is more profound for humans as
its wavelength fits between the ears
This is because of the interaural time difference (ITD),
the difference in arrival time of a sound between two
ears

10. Instrument frequencies
Piano
First key (lowest note): 27,5 Hz
Last key (highest note): 4186,01 Hz

11. Instrument frequencies
Guitar
1st string (E): 329,63 Hz
2nd string (B): 246,94 Hz
3rd string (G): 196,00 Hz
4th string (D): 146,83 Hz
5th string (A): 110,00 Hz
6th string (E): 82,41 Hz

12. Vocal frequency range
Soprano: 262 Hz – 1047 Hz
Mezzo-soprano: 110 Hz – 880 Hz
Contralto: 175 Hz – 698 Hz
Tenor: 130 Hz – 523 Hz
Baritone: 87 Hz – 349 Hz
Bass: 87 Hz – 330 Hz

13. Thank you
Thank you for watching this slideshow and I hope you
picked up something new from it !
Feedback/corrections always welcome !