Analog communication
What is Telecommunication?
Many people call telecommunication the world’s most
lucrative industry. If we add cellular and PCS users, there are about 1800 million subscribers to telecommunication services world wide (1999).
Annual expenditures on telecommunications may reach 900,000 dollars in the year 2000.
In industrialized nations, the telephone is accepted as a way of life.
The telephone is connected to the public switched
telecommunications network (PSTN) for local, national, and international voice communications.
These same telephone connections may also carry data and image information ( e.g., television).
An overall telecommunications network (i.e., the
PSTN) consists of local networks interconnected by a long-distance network.
INTRODUCTION TO COMMUNICATIONS
What is communications?
In its basic electrical sense, the term communications
refers to the sending, receiving and processing of information by electrical means.
It started with wire telegraphy in the late eighteenforties, developing with telephone some decades later and radio at the beginning of this century.
Radio communication, made possible by the invention
of the triode tube or valve, was greatly stimulated by the work done during World War II.
It subsequently became even widely used and refined through the invention and use of the transistor, integrated circuits and other semiconductor devices.
More recently, the use of satellite and fiber optics has made communications even more widespread, with an increasing emphasis on computer and other data communications. A modern communication system is first concern with the
sorting, processing and sorting of information before its transmission. The actual transmission then follows, with further processing and filtering of noise.
Finally we have reception, which may include processing steps such as decoding, storage and interpretation.
In this context, forms of
Many people call telecommunication the world’s most
lucrative industry. If we add cellular and PCS users, there are about 1800 million subscribers to telecommunication services world wide (1999).
Annual expenditures on telecommunications may reach 900,000 dollars in the year 2000.
In industrialized nations, the telephone is accepted as a way of life.
The telephone is connected to the public switched
telecommunications network (PSTN) for local, national, and international voice communications.
These same telephone connections may also carry data and image information ( e.g., television).
An overall telecommunications network (i.e., the
PSTN) consists of local networks interconnected by a long-distance network.
INTRODUCTION TO COMMUNICATIONS
What is communications?
In its basic electrical sense, the term communications
refers to the sending, receiving and processing of information by electrical means.
It started with wire telegraphy in the late eighteenforties, developing with telephone some decades later and radio at the beginning of this century.
Radio communication, made possible by the invention
of the triode tube or valve, was greatly stimulated by the work done during World War II.
It subsequently became even widely used and refined through the invention and use of the transistor, integrated circuits and other semiconductor devices.
More recently, the use of satellite and fiber optics has made communications even more widespread, with an increasing emphasis on computer and other data communications. A modern communication system is first concern with the
sorting, processing and sorting of information before its transmission. The actual transmission then follows, with further processing and filtering of noise.
Finally we have reception, which may include processing steps such as decoding, storage and interpretation.
In this context, forms of