TABLE OF CONTENTS Voice, video, data and telex information are transmitted in digital form through a channel that can cause degradation of these transmission signals. The noise, interference, fading and other obstacle factors experienced during transmission could increase the probability of bit error at the receiver. Differently to say, the data signal may be encoded in such a way as to reduce the likelihood of bit error. Anyway, the coding process uses redundant bits, which contain no information to assist in the detection and correction of errors. The subject of coding emerged following the fundamental concepts of information theory laid down by Shannon in 1948, which is the relationship between communication channel and the rate at which information can be transmitted over it. Basically, the theorems laying down the fundamental limits on the amount of information flow through a channel are given.
Channel processing is composed of special activities, which can improve the transmission techniques throughout satellite channels in connection with gain, errors, noise, interference, concentration and authenticity.
The system for digital speech concentration (interpolation) uses the activity factor of telephone channels in order to reduce the number of satellite channels required to transmit a given number of terrestrial channels. The Digital Speech Interpolation (DSI) technique is based on the fact that in a normal telephone conversation each participant monopolizes the circuit for only around half the time. As the silence between syllables, words and phrases increases so...
