Grade7 SoundWavesTERM4

Sound waves are vibrations in the air.

What does the human ear interpret these vibrations?

• Sunny

• Sound

• System

What does each soundwave consist of ?

• fault, wavelength and amplitude

• frequency, wave and amplitude

• freedom, wavelength and amplitude

• frequency, wavelength and amplitude

The amplitude specifies ................ of the sound

• the high

• the low

• the loudest

• the air

How do you measure the amplitude of sound ?

• analogue to digital converter (AD).

• analogue to digital converter (ACD).

• analogue to digital converter (ADC).

• analogue to digital converter (CDA).

Convert the analogue data to digital the sound waves are sampled at

• unregulated time intervals.

• time intervals.

• regular time intervals.

• time

What is sample rate?

• is the number of sound samples taken per second.

• Measure in hertz (Hz)

• is the number of sound samples taken per second

• Measure in hertz (Hz)

So how is sampling used to record a sound clip?

• the amplitude of the sound wave is first determined at set time intervals (the sampling rate)

• this gives an approximate representation of the sound wave

• each sample of the sound wave is then encoded as a series of binary digits

• one sample of the sound wave is then encoded as a series of binary digits