Voice Characteristics

1
Voice Characteristics
2
Voice Characteristics Objectives

• Chapter 2 Objectives
• Discuss Characteristics of voice
• Understand concept of bandwidth
• Converse about the variations of a
  conversation(amplitude/Frequency)
• Discuss capacities of various media used to carry
  information.
• Listen for changes and differences in
  conversation.

3
Voice Characteristics Definition

• Define telecommunication
• Tele - Greek root
• Communicate

4
Voice Characteristics Medium

• Medium
• Transmission capacity
• In form of
• Copper wires, coaxial cable,optical fiber, air

5
Voice Characteristics Sound

• Sound
• Analog
• Compression
• Rarefaction

6
Voice Characteristics Terms

• Physics of sound
• Sinusoidal Wave
• Hertz
• Kilo
• Band-limited Channel
• Bandwidth
• Megahertz (MHz)

7
Frequency and Amplitude
8
Bandwidth
9
4 kHz Bandwidth Channel
10
Bandpass Filter Separates Channels
11
Other Services

• Telephone network built to carry voice, only
• Data, facsimile, images, video must be
  transmitted within same constraints as voice
• Bandwidth
• Circuit design
• Switched or fixed, dedicated circuits
• Limitations on any communications system
• Bandwidth
• Noise
• Attenuation

12
Other Services