A signal is defined as a the physical quantity that varies with time, space or any other indepenent variables.
It means the signal is not modulated.
signal is a physical quantity.the system which capable of analyzing the signal is the system.
An amplifier amplifies the small input signal to a high signal without changing its freqency.
If meant ac signal then it is grounded so that the reference voltage is 0 & we get +ve voltage.
A low pass signal whose bandwidth is much smaller than its center frequency, such as an AM signal. It is a a signal with its spectrum concentrated around zero frequency.
The zero phase frequency is the frequency at which the phase of the input signal and the output signal match.
degration means to degrade something.
Repetition rate of an AM envelope refers to the frequency of the modulating signal thus the shape of the envelope is identical to the shape of the modulating signal.
Band pass refers to a specific range of frequencies requires for transmission of a signal over a appreciable distance for effective communication by applying special modulation techniques for effective transmission of a signal.
Metals are produced in the cooling mode, the signal (k) are specified.
Audio generator will produce some range of frequency and level of a test signal meant for audio. A signal generator will produce a test signal but is a more general classification. For example a audio generator is a signal generator. When you know what type of signal you are looking for, then a signal generator will be called that type of signal. all depends on what you are testing. examples: video -> video signal generator audio -> audio signal generator
while conversion of analog signal to digital signal, we need to convert continuous analog signal to discrete signal. this can be done by dividing the analog signal into specific time slots. this process is known as sampling. there is a condition for sampling that can be given as follows. fs<=2fm