06-15-2011, 04:53 PM
Analog vs. Digital Transmission
Compare at two levels:
1. Data continuous (audio) vs. discrete (text)
2. Signaling continuously varying electromagnetic wave vs. sequence of voltage pulses.
Also Transmission transmit without regard to signal content vs. being concerned with signal content. Dierence in how attenuation is handled, but not focus on this.
Improving digital technology
Data integrity. Repeaters take out cumulative problems in transmission. Can thus transmit longer distances.
Easier to multiplex large channel capacities with digital Easy to apply encryption to digital data
Better integration if all signals are in one form. Can integrate voice, video and digital Data.
Solid Reasons:
1. Analog circuits require appliers, and each ampler adds distortion and noise to t signal.
2. In contrast, digital appliers regenerate an exact signal, eliminating cumulative errors. An incoming (analog) signal is sampled, its value is determined, and the nod then generates a new signal from the bit value; the incoming signal is discarded. With analog circuits, intermediate nodes amplify the incoming signal, noise and al
3. Voice, data, video, etc. can all by carried by digital circuits. What about carrying digital signals over analog circuit? The modem example shows the deputies in carrying digital over analog.
Compare at two levels:
1. Data continuous (audio) vs. discrete (text)
2. Signaling continuously varying electromagnetic wave vs. sequence of voltage pulses.
Also Transmission transmit without regard to signal content vs. being concerned with signal content. Dierence in how attenuation is handled, but not focus on this.
Improving digital technology
Data integrity. Repeaters take out cumulative problems in transmission. Can thus transmit longer distances.
Easier to multiplex large channel capacities with digital Easy to apply encryption to digital data
Better integration if all signals are in one form. Can integrate voice, video and digital Data.
Solid Reasons:
1. Analog circuits require appliers, and each ampler adds distortion and noise to t signal.
2. In contrast, digital appliers regenerate an exact signal, eliminating cumulative errors. An incoming (analog) signal is sampled, its value is determined, and the nod then generates a new signal from the bit value; the incoming signal is discarded. With analog circuits, intermediate nodes amplify the incoming signal, noise and al
3. Voice, data, video, etc. can all by carried by digital circuits. What about carrying digital signals over analog circuit? The modem example shows the deputies in carrying digital over analog.
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