Analog vs Digital signals & Imparements

The power we use at home has a frequency of 60Hz. The period of this sine wave can be written as follows:

A periodic signal has a bandwidth of 20 Hz. The highest frequency is 60 Hz. What is the lowest frequency?

The strength of signals falls off with distance over any transmisison.

The course COMP 2140 introduces fundamental concepts related to the digital transmission and reception of information.

Signals can be analog or digital. Analog signals can have an infinite number of values in a range; digital signals can have only a limited number of values.

The values of SNR and SNR(dB) can be calculated as follows: SNR = (10,000uW / 1 mW) = 10,000 The value of SNR (dB) is 30 dB.

Consider the noiseless channel transmitting a signal with four signal levels . The maximum bit rate can be calculated as:

The loss in a cable is usually defined in decibels per kilometer (dB/km). If the signal at the beginning of a cable with −0.3 dB/km has a power of 2 mW, what is the power of the signal at 5 km in dB?

For any transmission event, the received signal will consist of the transmitted signal modified by the various distortion imposed by the transmission system plus additional unwanted signals that are inserted somewhere between transmission or reception. The latter undesired signals are referred to as:

There are three causes of impairments which are: