Exam 5: Signal Encoding Techniques

Multiple signals,each at a different position on the spectrum,sharing the same transmission medium,is known as frequency division ________.

A ________ converts digital data to analog signal so that it can be transmitted over an analog line.

A distinction needs to be made between data rate (expressed in bits per second)and ________ rate (expressed in baud)when signal encoding techniques are used.

There are two important parameters in a delta modulation scheme: the size of the step assigned to each binary digit and the ________ rate.

In ________ signaling one logic state is represented by a positive voltage level and the other by a negative voltage level.

The parameter known as the ________ is the ratio of the amplitude of the input signal to the carrier.

Bandwidth efficiency measures the efficiency with which bandwidth can be used to transmit data.

A coding scheme that is commonly used in Europe and Japan is the ________.

All modulation techniques involve operation on one or more of the three fundamental frequency domain parameters: amplitude,phase and _____.

The encoding scheme is the mapping from data bits to signal elements.

The most familiar use of transmitting digital data using analog signals is the public telephone network.

In ________,the two binary values are represented by two different amplitudes of the carrier frequency.Commonly,one of the amplitudes is zero.One binary digit is represented by the presence,at constant amplitude,of the carrier,the other by the absence of the carrier.

A digital signal is a sequence of discrete,discontinuous voltage pulses.

The ________ code has been specified for the IEEE 802.3 (Ethernet)standard for baseband coaxial cable and twisted pair bus LANs.

Both analog and digital information can be encoded as either analog or digital signals.

Frequency modulation and phase modulation are special cases of ________ modulation.

In general,the equipment for encoding digital data into a digital signal is more complex and expensive than digital to analog modulation equipment.

PCM starts with a continuous time,continuous amplitude signal from which a digital signal is produced.

The binary 1 represented by the absence of a line signal and the binary 0 by alternating positive and negative pulses is ________.

The device used for converting analog data into digital form for transmission,and subsequently recovering the original analog data from the digital,is a ________.