OCR J277: Sound Digitisation

Explore how Sample Rate and Bit Depth affect digital audio quality and file size.

Settings

Number of samples taken per second.

Number of bits used to store each sample.

Length of the audio recording.

File Size Calculation

Sample Rate: 10 Hz
Sample Resolution: 3 bits
Duration: 1 s
Total Size: 30 bits

Formula: Rate × Resolution × Seconds

💡 Exam Tip:

Increasing sample rate or resolution improves accuracy (fidelity) but increases file size.

Waveform Visualization

Analogue Digital Sample
AMPLITUDE (BITS)
TIME (1s SNAPSHOT)
Analogue Wave: Continuous smooth line.
Digital Wave: Discrete steps (the "staircase").