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Digital television
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Digital television is the application of
analog technology
bits of information
composed of
digital technology
doubling
electronic signal
frequency
in a sequence
points
providing
rate
signals
waves
to television to the process of producing and transmitting television programming. Television was developed as an "analog" medium, but the replacement of
analog technology
bits of information
composed of
digital technology
doubling
electronic signal
frequency
in a sequence
points
providing
rate
signals
waves
with digital technology throughout the television production and transmission process promises to increase the capabilities of the medium.
The term "digital" refers to a type of
analog technology
bits of information
composed of
digital technology
doubling
electronic signal
frequency
in a sequence
points
providing
rate
signals
waves
in which the information is stored
analog technology
bits of information
composed of
digital technology
doubling
electronic signal
frequency
in a sequence
points
providing
rate
signals
waves
of binary numbers ("on" or "off", representing one and zero) rather than in a continuously varying signal (known as an analog signal). Almost all naturally occurring communication media, including sound and light
analog technology
bits of information
composed of
digital technology
doubling
electronic signal
frequency
in a sequence
points
providing
rate
signals
waves
, are analog signals. Because analog signals are
analog technology
bits of information
composed of
digital technology
doubling
electronic signal
frequency
in a sequence
points
providing
rate
signals
waves
waves, they are extremely susceptible to interference, as the waves of external signals can interact with a specific signal, altering the shape of the wave. Digital signals are much less susceptible to interference because a slightly altered sequence of "on" and "off"
analog technology
bits of information
composed of
digital technology
doubling
electronic signal
frequency
in a sequence
points
providing
rate
signals
waves
can still be read as the original sequence of ones and zeroes.
The primary attributes of a digital signal are the sampling
analog technology
bits of information
composed of
digital technology
doubling
electronic signal
frequency
in a sequence
points
providing
rate
signals
waves
and the bit rate. In order to convert an analog signal to a digital one, the signal must be "sampled" by measuring the height of the analog signal at discrete
analog technology
bits of information
composed of
digital technology
doubling
electronic signal
frequency
in a sequence
points
providing
rate
signals
waves
in time. The "sampling frequency" is a measure of how many samples are taken to represent the analog wave. A higher sampling frequency indicates more samples,
analog technology
bits of information
composed of
digital technology
doubling
electronic signal
frequency
in a sequence
points
providing
rate
signals
waves
a more faithful reproduction of the analog signal. But
analog technology
bits of information
composed of
digital technology
doubling
electronic signal
frequency
in a sequence
points
providing
rate
signals
waves
the sample rate means doubling the amount of data needed to represent the original analog signal. Bit
analog technology
bits of information
composed of
digital technology
doubling
electronic signal
frequency
in a sequence
points
providing
rate
signals
waves
refers to the number of different "bits" (zero/one values) used to represent each sample. A higher bit rate results in a greater number of values for the signal, and, hence, a higher resolution. Most digital audio signals use eight or sixteen
analog technology
bits of information
composed of
digital technology
doubling
electronic signal
frequency
in a sequence
points
providing
rate
signals
waves
for each sample.
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