The Conversion of an Analog Speech Signal to a Pulse

question 57

Multiple Choice

The conversion of an analog speech signal to a pulse code modulation (PCM) digital signal involves all of the following steps EXCEPT:

• A) Low pass filtering
• B) Periodic sampling
• C) Quantizing
• D) Companding
• E) Amplitude modulation

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Definitions:

Sleep-Related Hypoventilation

Episodes of decreased breathing associated with high carbon dioxide levels.

Obstructive Sleep Apnea/Hypopnea Syndrome

A sleep disorder characterized by repeated episodes of partial or complete obstruction of the upper airway during sleep, leading to breathing interruptions and reduced oxygen levels.

Central Sleep Apnea

Sleep disorder characterized by complete cessation of respiratory activity for brief periods of time (20 seconds or more); sufferers do not have frequent awakenings and do not tend to feel tired during the day; occurs when the brain does not send the signal to breathe to the respiratory system.

Respiratory System

The biological system consisting of specific organs and structures used for gas exchange in animals and plants.