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Voice; Communications Concepts Technologies

Chapter2-Voice,CommunicationConcepts. 2. Data Communication. In this context, we mean data already stored on computersAlready digital, no conversion from analog form necessary. Chapter2-Voice,CommunicationConcepts. 3. Video Communication. Sequences of images over timeSame concept as image, but wit

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Voice; Communications Concepts Technologies

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    1. Chapter2-Voice,CommunicationConcepts 1 Voice; Communications Concepts Technologies Audio Data Image Video

    2. Chapter2-Voice,CommunicationConcepts 2 Data Communication In this context, we mean data already stored on computers Already digital, no conversion from analog form necessary

    3. Chapter2-Voice,CommunicationConcepts 3 Video Communication Sequences of images over time Same concept as image, but with dimension of time added Significantly higher bandwidth requirements in order to send images (frames) quickly enough Similarity of adjacent frames allows for high compression rates

    4. Chapter2-Voice,CommunicationConcepts 4 Response Time User response time System response time Network transfer time

    5. Chapter2-Voice,CommunicationConcepts 5 Bandwidth Requirements What happens when bandwidth is insufficient? How long does it take to become impatient? Is data communication ever “fast enough”?

    6. Chapter2-Voice,CommunicationConcepts 6 Voice Communications Concepts and Technologies Essential to understand nature of voice signals, as well as how voice signals is integrated into network with data transmissions Voice communication is increasingly becoming more digital in nature.

    7. Chapter2-Voice,CommunicationConcepts 7 Sound Several characteristics such as loudness of signal, variation in frequency, and distance between sender and receiver determines whether signal will arrive and make sense to recipient. Sound - periodic variation in air pressure Sound creates disturbance in media it travels across, whether that medium is air or copper wire.

    8. Chapter2-Voice,CommunicationConcepts 8 Sound Components Three components of sound wave are: frequency, wavelength, and amplitude of waveform.

    9. Chapter2-Voice,CommunicationConcepts 9 Frequency Frequency – Number of events happening over defined time period. Frequency communications measured in Hertz (number of cycles per second) Frequency of sound is number of times waveform represents itself each second

    10. Frequency, cont’d

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