1 / 18

Pitch and Frequency

Pitch and Frequency. Sound is created by vibrations…whether it’s the vocal cord or guitar string. The sensation of a frequency is called a pitch . High pitch = high frequency Low pitch = low frequency.

terrel
Télécharger la présentation

Pitch and Frequency

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Pitch and Frequency

  2. Sound is created by vibrations…whether it’s the vocal cord or guitar string.

  3. The sensation of a frequency is called a pitch. • High pitch = high frequency • Low pitch = low frequency

  4. When 2 sounds (with a difference of 7 Hz or greater) are played simultaneously, we can detect a complex wave resulting from the interference and superposition of the waves. • Certain sound waves when played and heard at the same time can produce a good sensation when heard. • In those cases, they’re said to be consonant.

  5. Those sound waves form the basis of intervals in music. • Any 2 sounds who make a 2:1 ratio are said to be separated by an octaveand sound pleasing. • In other words, two sounds sound good when one sound wave has twice the frequency as the other.

  6. Two musical notes that have a frequency ratio of 2:1 are said to be separated by an octave. A musical note that is separated by an octave from middle C (256 Hz) has a frequency of _____.

  7. Answer: A

  8. If sound is produced by vibrations, ex: guitar string, the more work involved (plucking the string further), will result in a bigger amplitude. • More amplitude = more energy

  9. Intensity: the amount of energy transported across a portion of the medium in a given amount of time.

  10. Intensity = Energy time (Area) Since P= E/t Intensity= Power Area

  11. Unit for intensity: Watts/meter2 • Or: W/m2

  12. As the sound wave travels, it loses intensity. • As it travels, it’s being spread over a larger area.

  13. The human ear is very sensitive • The faintest sound we can typically hear is 1x10-12 W/m2 • This is called the threshold of hearing. • The most intense sound a human can hear without serious physical damage is more than 1 billion times that.

  14. Since range is so large, physicists measure intensity on multiples of ten. • Called the logarithmic scale or decibel scale. • The threshold of hearing is 0 decibels. • Decibel is abbreviated dB • 0 dB = 1x10-12 W/m2

  15. Intensity is objective • Loudness is subjective. • It changes based on things like age. • Generally, though, more intense sounds are louder.

More Related