telephone communications

How Do You Calculate Channel Capacity When SNR Is Present?

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How Do You Calculate Channel Capacity When SNR Is Present? Hence, the channel capacity is directly proportional to the power of the signal, as SNR = (Power of signal) / (power of noise). So for example a signal-to-noise ratio of 1000 is commonly expressed as: 10 * log10(1000) = 30 dB. This tells us the

How Far Could The First Telephone Reach?

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How Far Could The First Telephone Reach? 10 August 1876: Alexander Graham Bell makes the world’s first long-distance telephone call, one-way, not reciprocal, over a distance of about 6 miles, between Brantford and Paris, Ontario, Canada. How much did the first telephone cost in 1876? Not just anybody could buy a DynaTAC phone: the phone