Electronics Communication Flashcards
Is the transmission, reception, and processing of information with the use of electronic circuits.
Electronic Communication
System involving the transmission of digital pulses.
Digital Transmission
Is the transmittal of digitally modulated analog signals(carriers) between two or more points in a communication system.
Digital Modulation
The information signal is digital and the frequency (f) of the carrier is varied proportional to the information signal.
Frequency Shift Keying ( FSK )
The information signal is digital and the amplitude (V) of the carrier is varied proportional to the information signal.
Amplitude Shift Keying ( ASK )
The information signal is digital and the phase (θ) of the carrier is varied proportional to the information signal.
Phase Shift Keying ( PSK )
Is defined as knowledge or intelligence that is communicated between two or more points.
Information
A modulation where both the amplitude and the phase are varied proportional to the information signal.
Quadrature Amplitude Modulation (QAM)
Performs level conversion and then codes the incoming data into groups of bits that modulate an analog carrier.
Pre-coder
Is a highly theoretical study of the efficient use of bandwidth to propagate information through electronic communications systems.
Information Theory
Is a measure of how much information can be propagated through a communications system and is a function of bandwidth and transmission time.
Information Capacity
The most basic digital symbol used to represent information.
Binary Digit / Bit
Refers to the rate of change of a signal on a transmission medium after encoding and modulation have occurred.
Baud
In 1928, _________ of Bell Telephone Laboratories developed a useful relationship among bandwidth, transmission time, and information capacity.
R. Hartley
Simply represents a digit that corresponds to the number of conditions, levels, or combinations possible for a given number of binary variables.
M
Refers to the rate of change of a digital information signal, which is usually binary.
Bit Rate
Sometimes called a symbol and could be encoded as a change in the amplitude, frequency, or phase
Signaling Element
The minimum theoretical bandwidth necessary to propagate a signal.
Nyquist Bandwidth
The carrier is either “on” or “off” which is why amplitude-shift keying is sometimes referred to as ________.
On-Off Keying
A logic 1 frequency (fm) for FSK.
Mark
A logic 0 frequency (fs) for FSK.
Space
The mark and space frequencies are separated from the carrier frequency by the _________and from each of by 2 Δf.
Peak Frequency Deviation (Δf)
_______ is the peak frequency deviation of the carrier and is equal to the difference between the carrier rest frequency and either the mark or space frequency.
Δf
Is binary FSK except the mark and space frequencies are synchronized with the input binary bit rate.
Continuous-Phase FSK ( CP-FSK )