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Question

The basic telephone channel has a bandwidth of.

A
2700 Hz
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B
2400 Hz
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C
1200 Hz
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D
3100 Hz
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Solution

The correct option is D 3100 Hz

The basic telephone channel has a bandwidth of 3100 Hz.

The bandwidth of a signal depends on the amount of information contained in it and the quality of it. The range of frequencies necessary for an analogue voice signal, with a fixed telephone line quality (recognizable speaker), is 300 - 3400 Hz. This means that the bandwidth of the signal is 3,100 Hz.

Passband bandwidth is the difference between the upper and lower cutoff frequencies of, for example, a band-pass filter, a communication channel, or a signal spectrum. Baseband bandwidth applies to a low-pass filter or baseband signal; the bandwidth is equal to its upper cutoff frequency.

To calculate the CARSON'S RULE bandwidth occupancy of this signal, add the highest audio frequency to the peak deviation (15KHz + 75KHz = 90KHz). Then multiply by two to include both the upper and lower sideband (90KHz X 2 = 180KHz). The CARSON'S BANDWIDTH for this signal is 180KHz.

In computing, bandwidth is the maximum rate of data transfer across a given path. Bandwidth may be characterized as network bandwidth, data bandwidth, or digital bandwidth.


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