Pulse Code Modulation Overview

Podcast

Play an AI-generated podcast conversation about this lesson

Questions and Answers

What is a primary challenge with natural sampling in analog-to-digital conversion?

It allows perfect reproduction of the original signal.

It enhances the performance of ADCs.

It alters the information frequency spectrum. (correct)

It creates ideal sample pulses.

What is the main purpose of a sample-and-hold circuit?

To convert PCM code directly to analog voltage.

To minimize frequency distortion during sampling.

To periodically sample analog signals and store them. (correct)

To increase the amplitude of the sampled voltage.

How does flat-top sampling differ from natural sampling?

It produces a wider sample pulse.

It requires a faster ADC operation.

It maintains a constant amplitude PAM voltage level. (correct)

It leads to greater aperture distortion.

What error is introduced by flat-top sampling?

Aperture error. Signup and view all the answers

What is a consequence of sampling with narrow, finite-width pulses?

Decreased amplitude of higher harmonics. Signup and view all the answers

Which of the following describes a feature of aperture error?

It is affected by the width of the sample pulse. Signup and view all the answers

Which component operates as a switch in a sample-and-hold circuit?

The FET. Signup and view all the answers

What term is used for the time that the switch in a sample-and-hold circuit is on?

Aperture time. Signup and view all the answers

What does pulse width modulation (PWM) vary in relation to the analog signal?

The width of the pulse Signup and view all the answers

In Pulse Position Modulation (PPM), what factor determines the position of the pulse within a time slot?

The amplitude of the analog signal sample Signup and view all the answers

Which pulse modulation method produces waveforms that closely resemble the original analog signal?

Pulse Amplitude Modulation (PAM) Signup and view all the answers

What is the primary characteristic of Pulse Code Modulation (PCM)?

It converts the analog signal into an n-bit binary code. Signup and view all the answers

Which method of pulse modulation has the narrowest pulse corresponding to the minimum analog signal amplitude?

Pulse Width Modulation (PWM) Signup and view all the answers

How many bits does each code in Pulse Code Modulation (PCM) have?

The same number for all codes Signup and view all the answers

What is a key difference between Pulse Amplitude Modulation (PAM) and Pulse Width Modulation (PWM)?

PAM varies the amplitude of pulses, while PWM varies pulse width. Signup and view all the answers

Which modulation technique results in pulses that are consistently of the same amplitude?

Pulse Width Modulation (PWM) Signup and view all the answers

What is Pulse Code Modulation primarily used for?

Representing analog signals in a digital form Signup and view all the answers

Which of the following is a key application area of Pulse Code Modulation?

Telecommunications Signup and view all the answers

What benefit does Pulse Code Modulation offer concerning digital resources?

It balances accurate signal representation with efficient resource use. Signup and view all the answers

What is one of the ongoing advancements related to Pulse Code Modulation?

Improved signal quality Signup and view all the answers

What is the primary function of the band pass filter in a PCM system?

To limit the frequency of the analog input signal Signup and view all the answers

What does the ADC do in a PCM system?

Converts PAM samples into parallel PCM codes Signup and view all the answers

Which of the following best describes Pulse Code Modulation?

A digital signal processing technique Signup and view all the answers

Which component is responsible for converting parallel PCM codes back into analog form in the receiver?

Digital-to-analog converter Signup and view all the answers

How does Pulse Code Modulation help in the digital communication field?

By representing analog signals for digital transmission Signup and view all the answers

What aspect of Pulse Code Modulation contributes to a more efficient use of digital resources?

Its encoding and compression capabilities Signup and view all the answers

What is the purpose of the hold circuit in a PCM system?

To filter the returned PAM signal back to analog form Signup and view all the answers

What would happen if the voltage changes before the ADC finishes its conversion?

The ADC may never achieve a stable PCM code Signup and view all the answers

Which statement about Pulse Code Modulation is NOT true?

It is only applicable to telecommunications. Signup and view all the answers

Which of the following statements about PCM sampling techniques is true?

Flat-top sampling simplifies the ADC conversion process Signup and view all the answers

In a PCM system, what role does the parallel-to-serial converter play?

It converts parallel PCM codes to serial binary data Signup and view all the answers

What is the integrated circuit that performs both PCM encoding and decoding functions called?

Codec Signup and view all the answers

What is the primary function of a network switch?

To connect devices within a local area network Signup and view all the answers

Which of the following accurately describes a mesh topology?

Each device is connected to every other device Signup and view all the answers

What is the purpose of a network bridge?

To filter traffic between two or more networks Signup and view all the answers

Which of the following statements about multimode fiber optic cables is true?

They allow multiple light modes to pass through simultaneously Signup and view all the answers

Which layer of the OSI model is responsible for end-to-end communication?

Transport layer Signup and view all the answers

In a Metropolitan Area Network (MAN), which of the following is typically true?

It connects multiple local area networks within a city Signup and view all the answers

What distinguishes a repeater from a hub in a network?

A repeater regenerates signals, while a hub merely broadcasts them Signup and view all the answers

Which type of device is primarily used to create a network connection in a home environment?

Router Signup and view all the answers

Which type of topology requires a central hub or switch to connect all devices?

Star Topology Signup and view all the answers

What is the main characteristic of a Personal Area Network (PAN)?

Used for connecting personal devices within a short range Signup and view all the answers

Which cable type is specifically designed for long-distance communication with minimal signal loss?

Single Mode Fiberoptic Cable Signup and view all the answers

Which connector is commonly used for Ethernet cabling?

RJ45 Connector Signup and view all the answers

In networking, what does STP in 'STP Cable' stand for?

Shielded Twisted Pair Signup and view all the answers

Which of the following is a common flaw of bus topology?

If the main cable fails, the entire network goes down Signup and view all the answers

What is a disadvantage of using a thicknet coaxial cable?

Requires special equipment for termination Signup and view all the answers

What is the role of a router in a computer network?

To connect multiple networks and route data packets between them Signup and view all the answers

Study Notes

Pulse Code Modulation (PCM)

Digital transmission transmits digital signals between points in a communications system
Signals can be binary or other discrete-level digital pulses
Original source information may be digital or analog converted to digital pulses for transmission
Physical infrastructure (wires, coaxial cable, optical fiber) is needed to connect points in the system
Digital transmission has noise immunity
No need to precisely measure amplitude, frequency, or phase to evaluate logic state
Pulses are assessed during a specific time, categorized as above or below a reference level
DSP (Digital Signal Processing) is better suited to process and combine digital signals
Easier to store and change transmission rates for different environments/equipment
More resistant to additive noise (noise from electronic systems accumulating)
Digital signals can be transported over longer distances than analog signals
Digital signal regeneration allows for a new digital signal with the same signal-to-noise ratio regardless of distance.
Easier to measure and evaluate digital than analog signals
Digital transmission requires more bandwidth than simple analog transmission
Conversion to digital pulses requires encoding/decoding circuitry
Accurate time synchronization between transmitter and receiver clocks is critical

Pulse Modulation

Pulse Modulation generally samples analog information signals then converts into discrete pulses
Pulse modulation includes four methods: Pulse Width Modulation (PWM), Pulse Position Modulation (PPM), Pulse Amplitude Modulation (PAM), and Pulse Code Modulation (PCM)

PCM (Pulse-Code Modulation)

Analog signal sampled and converted to an n-bit binary code
Each code has same bit length and transmission time.
PCM is the most prevalent type of pulse modulation.
PCM system samples an analog input signal to convert to digital PCM form

Studying That Suits You

Use AI to generate personalized quizzes and flashcards to suit your learning preferences.

Description

Explore the fundamentals of Pulse Code Modulation (PCM) and its significance in digital transmission systems. Learn about the advantages of digital signals, including noise immunity and their ability to be transported over long distances. This quiz will assess your understanding of how PCM works in various communication infrastructures.