1 / 16

SOUND

SOUND. SOUND. KEY TOPICS NATURE OF SOUND AUDIO SPECTRUM RESONANCE & FORCED VIBRATION REFLECTION. VIDEO. Animation of an audio speaker as it creates sound. VIDEO. LONGITUDINAL WAVES. SOUND. SOUND IS THE COHERENT VIBRATIONS OF ATOMS OR MOLECULES IN SOLIDS, LIQUIDS AND GASSES.

giulio
Download Presentation

SOUND

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. SOUND

  2. SOUND KEY TOPICS NATURE OF SOUND AUDIO SPECTRUM RESONANCE & FORCED VIBRATION REFLECTION

  3. VIDEO Animation of an audio speaker as it creates sound.

  4. VIDEO LONGITUDINAL WAVES

  5. SOUND • SOUND IS THE COHERENT VIBRATIONS OF ATOMS OR MOLECULES IN SOLIDS, LIQUIDS AND GASSES. • INCOHERENT VIBRATIONS ARE CALLED HEAT.

  6. SOUND SOUND SPECTRUM INFRASOUND < 20 HZ • AUDIBLE SOUND > 20 HZ • AND < 20 KHZ ULTRASOUND >20 KHZ

  7. SOUND Sound Demo using an audio generator

  8. SOUND • THE SPEED OF SOUND IN AIR IS APPROXIMATELY • 330 m/s • 1000 ft/s DEMO • THIS IS ALSO DESIGNATED MACH 1 • THE SPEED DEPENDS ON TEMPERATURE, PRESSURE AND HUMIDITY

  9. VIDEO This video shows that there is a delay in the arrival of the sound you hear when a sound is produced by an event located at a distance.

  10. RESONANCE • VIBRATING AT A NATURAL FREQUENCY • ENERGY CAN BE TRANSFERRED EFFICIENTLY TO A VIBRATING OBJECT VIA RESONANCE.

  11. VIDEO The Tacoma Narrows bridge collapse is one of the most dramatic examples of resonance.

  12. RESONANCE • RESONANCE IS USED TO PRODUCE MUSICAL NOTES WITH A DEFINITE FREQUENCY. • EXAMPLES OF VIBRATING OBJECTS • STRINGS • AIR COLUMNS • SURFACES (DRUMS)

  13. FORCED VIBRATION • VIBRATING AT A NON-RESONANT FREQUENCY • IT IS OFTEN APPLIED TO THE AMPLIFICATION OF SOUND

  14. PITCH THE AUDITORY PERCEPTION OF FREQUENCY

  15. REFLECTION OF SOUND REVERBERATION • RE-REFLECTED SOUND THAT OCCURS IN CONFINED AREAS SO THAT THE REFLECTED SOUND CAN NOT BE DISTINGUISHED FROM THE SOURCE • EXAMPLE - EMPTY ROOM

  16. REFLECTION OF SOUND ECHO THE SOUND IS THAT NORMALLY REFLECTED OUTSIDE OR IN LARGE ENCLOSED AREAS SO THAT THE REFLECTED SOUND CAN BE DISTINGUISHED FROM THE SOURCE.

More Related