because it delays the input signal by some time interval before it appears on the output.
if a signal is a function of single independent variable,then signal is called multichannel signal. if a signal is function of multiple independent variable then signal is called multidimensional signal.
In heat one: one long whistle means for the swimmers to , then the official says "take your mark". A gun, whistle, or beep may be heard as the signal for "GO". In further heats: as the last swimmer from the heat before reaches the flags, 3 short whistles are heard to signal the next heat of swimmers that it is time for the next heat to get ready. The same commands as above then apply.
When you convert digital signal to analog, it is called as an analog signal. The device used is called digital to analog converter.
A reflected radar signal is called an echo.
You are describing what we called pheromones. These usually are not made much before the age of puberty.
When the out from a transistor is the exact replic of the input signal then it is called unmodulated signal i e. there will not be any change in frequency voltage power etc
after
if tere are enough branches in the way - yes. --------------- At my friends house he can receive satellite in the winter when there are no leaves on the trees.however when the trees leaf up in the spring the satellite signal is too weak to be of any use...Come the fall, when the leaves drop, the signal comes back and his satellite works again.
So that it doesn't lose the signal completely before reaching the repeater.
So that it doesn't lose the signal completely before reaching the repeater.
Amplification.