A bioacoustics researcher uses a high-specification digital audio recorder to capture ultrasonic bat echolocation calls. The continuous acoustic wave must be digitized using an Analogue-to-Digital Converter (ADC) as illustrated in the sampling diagram below:
Which description correctly defines how the analogue signal is sampled to create a digital representation?
The instantaneous frequency of the analogue wave is measured at regular time intervals, and each frequency value is mapped directly to a binary integer.
The instantaneous amplitude of the analogue wave is measured at regular time intervals, and each measurement is quantized to the nearest binary value defined by the sampling resolution.
The peak-to-peak amplitude is measured continuously over each cycle, and the total duration of each cycle determines the sampling rate.
The phase angle of the analogue wave is measured at discrete intervals, and the bit depth determines the maximum frequency that can be represented.
Data storage Questions
Practise OCR GCSE Computer Science Data storage with exam-style questions for GCSE Computer Science. 42 questions, matched to the OCR GCSE Computer Science (J277) specification and written in Component 01 and Component 02 style. Every question includes a full worked solution and mark scheme, so you can see where marks are awarded rather than just whether you got the answer right.