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Decibel strength of signal, Required signal levels

1. A signal starts at point x. As it travels to point y it loses 8 db. At point y the signal is boosted by 10 db. As the signal travels to point z it loses 7 db. What is the db strength of the signal at point z?

2. What is the decibel loss of a signal that starts at point A with a strength of 2000 watts and ends at point B with a strength of 400 watts?

3. If a telephone line can carry a signal with a baud rate of 6000 and we want to transmit data at 33600 bps, how many different signal levels will be necessary? Is this how 33600 bps modem operates?

Solution Preview

1. Let us say that the decibel (db) strength of signal at point x is S. To compute the db strength of signal at point z, we can simply add the db losses and boost on the way.

So the db strength of signal at point z = db strength of signal at point x - db loss between points x and y + db signal boost at point y - db loss between points y and z
= S - 8 + 10 - 7
= S - 5

So, the db strength of signal at ...

Solution Summary

Baud signifies how many times a signal changes per second, however it does not restrict how many signal levels could possibly be there.