Quiz on Analog-to-Digital Conversion

What is the main purpose of Analog-to-Digital Conversion (ADC)?

• To generate analog signals from digital signals

• To filter noise from analog signals

• To transform continuous signals into discrete digital data

• To amplify the analog signal

Which of the following is not a standard step in Pulse Code Modulation (PCM)?

• Sampling

• Filtering

• Encoding

• Quantization

According to the Nyquist Theorem, the sampling frequency must be:

• Equal to the highest frequency of the signal

• Half the highest frequency of the signal

• Twice the highest frequency of the signal

• Arbitrarily higher than the signal

In natural sampling, how is the pulse shaped?

• Flat and uniform

• Triangular

• Rectangular with varying heights

• Retains the shape of the analog signal

Which sampling method is most commonly implemented in PCM systems?

• Ideal sampling

• Flat-top sampling

• Natural sampling

• Sinusoidal sampling

What is aliasing in the context of sampling?

• A technique for compressing audio signals

• A process of converting analog signals to binary directly

• A problem when the sampling rate is too low

• A result of over-quantization

What component removes unwanted frequencies before sampling?

• Bandpass filter

• High-pass filter

• Low-pass filter

• Quantizer

What is the formula for calculating the quantization step size d?

• d = Vmax / L

• d = (Vmax + Vmin) / L

• d = (Vmax - Vmin) / L

• d = L / (Vmax - Vmin)

If a signal is divided into 16 quantization levels, how many bits are needed per sample?

• 2 bits

• 4 bits

• 8 bits

• 16 bits

In encoding, what does the number of bits per sample depend on?

• Sampling rate

• Low-pass filter settings

• Number of quantization levels

• Nyquist frequency