Data Representation Recap

What is the difference between analogue and digital data?

• Analogue is continuous data, whereas digital signals have two values, 0 and 1.
• Analogue has two values 0 and 1, whereas digital is continuous data.

Define the term 'sample rate'.

• Snapshots of sound are taken as the wave cannot be represented as a series of continuous changes.
• The number of samples taken each second
•  The number of bits used per second of audio
•  The number of bits available for each clip

Define the term 'sampling'.

• Snapshots of sound are taken as the wave cannot be represented as a series of continuous changes.
• The number of samples taken each second
•  The number of bits used per second of audio
•  The number of bits available for each clip

Define the term 'bit rate'.

• Snapshots of sound are taken as the wave cannot be represented as a series of continuous changes.
• The number of samples taken each second
•  The number of bits used per second of audio
•  The number of bits available for each clip

Define the term 'bit depth'.

• Snapshots of sound are taken as the wave cannot be represented as a series of continuous changes.
• The number of samples taken each second
•  The number of bits used per second of audio
•  The number of bits available for each clip

Which three factors affect the quality of an audio clip?

• Bit rate and bit depth
• Bit rate, bit depth and number of pixels
• Sample rate, analogue, number of pixels
• Sample rate, bit rate and bit depth

How does bit rate affect the quality of an audio clip and file size?

• The higher the bit depth, the higher the quality of the audio, but the larger the file size
• The more bits that are sampled the better the accuracy of the file but also the greater the file size. 
• Greater the frequency of the samples, the better the sound quality.

How does bit depth affect the quality of an audio clip and file size?

• The higher the bit depth, the higher the quality of the audio, but the larger the file size
• The more bits that are sampled the better the accuracy of the file but also the greater the file size. 
• Greater the frequency of the samples, the better the sound quality.

How does sample rate affect the quality of an audio clip and file size?

• The higher the bit depth, the higher the quality of the audio, but the larger the file size
• The more bits that are sampled the better the accuracy of the file but also the greater the file size. 
• Greater the frequency of the samples, the better the sound quality.

Calculate the bit rate of a 16 bit file sampled at 8Khz in stereo (2 channels).  What is the answer in bits per second and bytes per second?

• 256 bits per second.  32 bytes per second.
• 32 bits per second.  4 bytes per second
• 512 bits per second. 64 bytes per second.
• 1024 bits per second. 128 bytes per second.