CBSE Class 12-science Answered
Analog signal |
Digital signal |
1. Analog signal is in the form of a continuous wave.eg, sine wave |
1. Digital signal is in the form of a pulse code ie, 0 and 1. |
2. Analog signal looks like:
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2. Digital signal looks like:
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Functions of:
(i) Transducer: It converts one form of energy to another. Or it converts some physical variable like:
pressure, displacement etc to corresponding variation in electrical signal.
(ii) Repeater: It picks up signal from transmitter and then amplifies it and further retransmits it to the
receiver.
Repeaters are used to extend the range of communication.
(iii) Transmitter: it is an arrangement that converts the message signal to a form suitable for transmission
and then transmits it through suitable communication channel.
(iv) Bandpass filter: A band pass filter allows a band of frequencies to pass though and rejects frequencies
higher/lower than that band.