Upload
tyrone-morris
View
220
Download
3
Tags:
Embed Size (px)
Citation preview
1© 2012 InfoComm International
Essentials of AV Technology
Introduction to AV Systems
2© 2012 InfoComm International
Part OneIntroduction to AV Systems
3© 2012 InfoComm International
AV Systems EssentialsYou will learn about:
What defines a system
Why systems are important
The purpose of a system
Active and passive systems
Where AV systems can be found
Types of AV systems
How an AV system is created
Ergonomics
Subsystems
4© 2012 InfoComm International
AV System Applications
Defining an AV system
AV systems Usage
5© 2012 InfoComm International
AV Systems Goals
Communicate and share
Meet an objective
6© 2012 InfoComm International
Overview of AV System Creation
Wants and Needs
Design
Install
Support
Allied trades
7© 2012 InfoComm International
Active and Passive Systems
Active Systems
- Lighting, audio, projection
Passive systems
-Wall coverings, furniture, screens
8© 2012 InfoComm International
AV SubsystemsAn AV system can include several subsystems
Stand Alone
Support of objective
Multiple subsystems that supports larger system
Subsystems are only a small part of a larger complete system.
9© 2012 InfoComm International
AV Systems SummaryYou have now learned about systems in general. The topics you have covered in this section are:
What defines a system
Examples of where AV systems can be found
Types of AV systems
Why AV systems are important
The purpose of an AV system
The overview for creating an AV system
AV allied trades
Active and passive systems
The definition of a subsystem
Indicators of subsystems
10© 2012 InfoComm International
Part TwoAnalog and Digital Signals
11© 2012 InfoComm International
Analog and Digital Signals Introduction
This section will cover:
• Analog and Digital Signals
• Waveforms
• Digital Signal Processing and Sampling
• Bit Depth of a Digital Signal
• Bit Rate
12© 2012 InfoComm International
Analog and Digital Signals
Analog: continuous waveform
always varying states
Digital: "On (1)" and "Off (0)" positions only
2 states
13© 2012 InfoComm International
Waveforms
Analog Waveform Digital Waveform
14© 2012 InfoComm International
Digital Signal Processing and Sampling
15© 2012 InfoComm International
Bit Depth of a Digital Signal
Bit Depth: The number of states in which to describe the sampled voltage level.
4-bit grayscale: a 4-bit pixel has 16 potential shades
16© 2012 InfoComm International
Bit RateBit Rate: Quantity of information over time in a digital
signal stream
Format Bit Rate
Mp3 128-160 Kbit/s
AudioCD 1411.2 Kbit/s
VideoCD 1 Mbit/s
DVD 5 Mbit/s
HDTV 20Mbit/s
17© 2012 InfoComm International
Signal Compression
Reduces file size
Codecs
18© 2012 InfoComm International
Digital FormatsContainers:
File structure
Defines how data is arranged
MOV, AVI, WMV, MPEG-2
Codecs:
Compression algorithms
Compression/DECompression
19© 2012 InfoComm International
Lossless and Lossy Compression
Lossless: Same as original
Lossy: Approximation of original data
20© 2012 InfoComm International
Noise and Signal Transmission
Analog signal-to-noise ratio affected
Digital signals more resistant
21© 2012 InfoComm International
Amplifiers and Signal Transmission
Analog - signal to noise ratio affected
Digital - signals more resistant to noise
22© 2012 InfoComm International
Analog and Digital Signal Considerations
Analog Recordings
Duplicating of continuous signals
Short lifetime
Short lifetime
Digital Recordings
Duplicating list of numbers
Long lifetime
Copies are equal quality
23© 2012 InfoComm International
Analog and Digital Signals Summary
Representation of digital data
Sampling rate vs. digital signal accuracy
Bit depth determines precision
Digital video file formats
Lossless and lossy compression
Analog recordings and the duplication process
Digital recording advantages