(This answer assumes that this is a straightforward question about the electrical term "DC". If it is about something else, feel free to explain in the discussion area and I will try to answer.) "DC" refers to Direct Current. This is as opposed to "AC", which stands for Alternating Current. Direct Current involves a flow of current (electron flow) in one direction only. The delivery of power to an electronic circuit is by far the most common application of DC current in your house, for example. (There are some high power DC power delivery systems used in industry as well as other non-domestic applications such as welding.) Alternating Current involves a flow of current that reverses direction periodically, that is, at some "frequency". Historically, the vast majority of "signalling" was done with AC. This corresponds to what we commonly call "analog" today, including audio, radio, and telephone communications. With the advent of the digital age, digital signal transmission (in the case of signaling over most wires and circuit traces) could be considered to be switched DC, since the current direction does not reverse, i.e., during the signalling of a digital "one", current flows in one direction, while during the signalling of a digital zero no current flows (so the direction does not alternate, it only stops and starts). (By no means all digital signalling is DC however. All wireless transmission could be considered to be AC, and signalling in systems such as USB and FireWire is AC.)
DC Component or Direct current component are frequencies around zero.InDigital transmission when a voltage level in a digital signal is constant for awhile,the spectrum creates very low frequencies.These frequencies aroundzero,called DC components which present problems for a system that cannotpass low frequencies or a system that uses electrical coupling(Transformer)Read more:
A digital signal requires a repeater, which retransmits the signal in its original form, and an analog signal requires an amplifier, which increases the strength of both the signal and the noise it has accumulated.
You could attach an external directional antenna. Google for 'wireless antenna'.
how do we protect our cable network from signal jammer
duplexer is the device that can separated the trasmitted signal and received signal.
A: while a step can be of both polarity but it is a level change and it is DC LEVELS
This DC voltage is called the DC offset. Any decent signal generator will be able to add DC offset to the signal it generates. If you don't have one, simply connect a DC voltage to your signal.
It is called ( pulsed DC ).
ac
we use dc supply for amplifcation and dc have no frequincy. we amplify just signal curent or signal voltage.
The Amplification is much high during acmode because of transister conducts boththe Half cycles.But in DC the transister conducts only in positive half cycles.So the Amplification of AC signal greater than DC signal.
The operation of a rectifier is to conver a AC signal to a pulsating DC signal
chopper use a ststeing perpose..... dc means direct current that is low voltage
DC current
signal which remains constant over a certian interval of time.e.g dc voltage
Yes DC is periodic with zero frequency........and undefined fundamental time period To........
to keep the signal awy from the dc limit ,, to ban the clipping of the signal