1.2 Text, Images and Sound L3

Multiple Choice

What is real life sound known as?

• Analogue Sound
• Digital Sound

Multiple Choice

Computer can convert sound into binary

• Yes

• No

Multiple Choice

Sound is stored in computer as analog wave.

• Yes

• No

Multiple Choice

____________ is used to convert the analogue wave to digital sound

• Analogue-to-Digital Convertor

• Digital to Analogue Convertor

• Analogue Wave Convertor

Multiple Choice

Increasing the amount of bits available for each sample has what effect on the file size?

• Increases

• Nothing

• Decreases

Multiple Choice

Increasing the sample rate has what effect on the file size?

• Increases

• Nothing

• Decreases

Multiple Choice

Increasing the sample rate has what effect on the quality?

• Increases

• Nothing

• Decreases

Multiple Choice

A sample is

• The tempo of the sound wave

• A measure of the amplitude at that moment

• The amount of bits needed to store the sound wave

• The information needed to reconstruct the sound wave

Multiple Choice

What sample rate is the standard?

• 22 kHz

• 32 kHz

• 44.1 kHz

• 86 kHz

Multiple Choice

What sample rate is the standard?

• 22 kHz

• 32 kHz

• 44.1 kHz

• 86 kHz

Multiple Choice

State the measurement used for the sample rate of an audio file.

• Hertz (Hz)

• Seconds (s)

• Minutes (m)

• Bytes (b)

Multiple Choice

Label the y axis of this analogue sound wave.

• Amplitude

• Frequency

• Duration (Time)

• Volume

• Pitch

Multiple Choice

Label the x axis of this analogue sound wave.

• Amplitude

• Frequency

• Duration (Time)

• Volume

• Pitch

Multiple Choice

Define what is meant by "sampling rate", when converting an analogue sound into digital.

• How many samples of the sound is taken per second.

• How many samples of the sound is taken per minute.

• It is the gap between each of the points where the analogue sound is sampled.

• It is the number of bits used for each sample.

Multiple Choice

Define what is meant by "sample size", when converting an analogue sound into digital.

• How many samples of the sound is taken per second.

• How many samples of the sound is taken per minute.

• It is the gap between each of the points where the analogue sound is sampled.

• It is the number of bits used for each sample.

Multiple Choice

Describe how an analogue sound is converted into digital form.

• Samples of the amplitude are taken at regular intervals. Each sample is stored as a binary number to form an approximated sound.

• Samples of the wavelength is measured for the whole recording. This measurement is stored as binary numbers to form an approximated sound.

Multiple Choice

With a sound wave, the higher the amplitude...

• The louder the sound.

• The quieter the sound.

• The higher the pitch.

• The lower the pitch.

Multiple Choice

With a sound wave, the shorter the amplitude...

• The louder the sound.

• The quieter the sound.

• The higher the pitch.

• The lower the pitch.

Fill in the Blanks

State the number of samples that would be taken per second if the sample rate is 30KHz.

Fill in the Blanks

State the number of samples that would be taken per second if the sample rate is 44.1KHz.