Modulation Systems EMS310 - Ch 6 Sampling and A/D Conversion

Vocabulary flashcards covering key terms and concepts from Chapter 6 on Sampling and A/D Conversion.

Sampling Theorem

States that a continuous signal can be fully reconstructed from its samples if it is sampled at a rate greater than or equal to twice its highest frequency.

Nyquist Rate

The minimum sampling rate that allows for perfect reconstruction of a signal, defined as twice the maximum frequency of the signal.

Pulse Code Modulation (PCM)

A method used to digitally represent analog signals, wherein the amplitude of the signal is captured at regular intervals.

Differential Pulse Code Modulation (DPCM)

An extension of PCM that encodes the difference between successive samples instead of encoding the samples themselves.

Ideal Low Pass Filter (LPF)

A filter that allows signals with a frequency lower than a certain cutoff frequency to pass through and attenuates frequencies higher than the cutoff.

Quantization Noise

The difference between the actual signal and the quantized signal due to rounding errors in the quantization process.

Anti-aliasing Filter

A filter designed to reduce aliasing by removing high-frequency components before sampling.

Adaptive Differential PCM (ADPCM)

A form of DPCM that adjusts the quantization step size based on the characteristics of the signal.

Aliasing

The distortion that occurs when a signal is sampled at a rate lower than the Nyquist rate, leading to misrepresentation of the signal.

Signal Reconstruction

The process of reconstructing a continuous signal from its discrete samples, often using interpolation methods.

Time Division Multiplexing (TDM)

A method of transmitting multiple signals over a single communication channel by dividing the signal into different time slots.

Quantization Levels

The defined intervals into which an analog signal is divided during the quantization process in digital conversion.