Sound waves

A vibrational disturbance that involves mechanical motion of molecules

transmitting energy from one place to another.

Sound waves expirement

Compression

• Reducing a signal's output level in relation to its input level to reduce dynamic range.

çompression waves test

Frequency

• The # of times per second that a sound source vibrates, expressed in hertz (Hz).

ƒrequency test

Hertz

Unit of measurement of frequency; numerically equal to cycles per second (cps).

Infrasonic

• The range below the frequencies audible to human hearing.

Look onto the frequency video again, the sounds you cannot hear, whicha re also measured in hertz (last slide) are examples of infrasonic sound

Ultrasonic

• The range above the frequencies of human hearing.

Dog whistles

Pitch

• The subjective perception of frequency - the highness or lowness of a sound.

Pitch

Fundamental

• The lowest frequency a sound source can produce. In other words, it is also called the first harmonic or primary frequency which is the lowest, or basic, pitch of a musical instrument.

Low frequency

Sound Frequency Spectrum

• The range of frequencies audible to human hearing: about 20 to 20,000 Hz.

Return to previous video

Octave

• The interval between two frequencies that have a tonal ratio of 2:1.

Mariah Carey octaves

Bass

• The low range of the audible frequency spectrum; usually from 20 to 320 Hz

Bass

Midrange

• The part of the frequency spectrum to which humans are most sensitive; the frequencies between roughly 320 Hz and 2,560 Hz.

Return to video on slide 8

Treble

• Frequency range between roughly 5,120 Hz and 20,000 Hz, the highest two octaves audible to human hearing in the sound frequency spectrum.

Equalization

• A signal-processing device that can boost, attenuate, or shelve frequencies in a sound source or sound system.

Amplitude

• The magnitude of a sound wave or an electric signal, measured in decibel's.

Decibel (dB)

• A relative and dimensionless unit to measure the ratio of two quantities.

Wavelength

• Distance between two peaks of a wave

Velocity

• Speed in a given direction

Harmonic

• Is a multiple of the fundamental frequency

Phase

• Factor in the interaction of one wave with another, either acoustically or electronically

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