Tomas 2008-12-16, Ant. 10:22:14
Siek tiek pasiskaitymui apie ASC ir AS
AUTOMATIC SQUELCH CONTROL
THE AUTOMATIC SQUELCH CONTROL BY NOISE LEVEL
The PRESIDENT ELECTRONICS GROUP is pleased to inform you that its laboratories have succeeded in developing a new system of SQUELCH.
Its concerns a real automatic squelch control: ASC ( for AUTOMATIC SQUELCH CONTROL ) is the acronym under which it will be identified on the international market. Do not confuse with the systems on " fixed threshold " preajusted at the factory. Some are systems that could be called " with an unconditional silence " under a certain level of the received signal ( or noise ). Other systems are limited to reduce the sound level instead of cutting it completely, under a pre-established signal level if it concerns atmospheric noises and not messages.
The ASC keeps the squelch automatically closed, even if a weak noise level is reached, or insufficient for producing a relation signal/noise of an acceptable comfort. But as soon as the noise
decreases, or as soon as the recieved signal reaches a level liable to produce an exploitable relation signal/noise, it opens automatically the reciever. It makes the difference between a real SIGNAL and a simple NOISE.
In the case of strong levels of noise, the behavor is the same, without having to touch anything, even if the signal is strong enough, the ASC maintains automatically the closed reciever if the level of the radio noise is still stronger, in order to prevent a sufficient relation signal/noise. But even at that moment, as soon as the noise decreases, the ASC opens automatically the reciever in order to allow to hear the communications.
The originality of this functioning rests in the fact that it is not based on a threshold of a signal referency, not fixed or adjustable, from which the reciever should be opened or in watch. The ASC makes a permanent valuation of the recieved signal and the existing noise. And it is the relation signal / noise that determines the opening of the reciever or its maintenance in watch.
The notion of watch, in the sence given to this word in radiocommunications, has been profoundly changed when you realize what the ASC makes. In this case, watch dosen't significate only silence
and rest, but also vigilance. Indeed, for example: it controls constantly if an eventual decrease of the reciever noise should allow a comfortable reception of a distance transmition thus far lost in the noise. Its a kind of active watch.
The inventive value of this system is protected by a worldwide invention patent.
The user will enjoy the comfort and the quietness provided by the active watch that the ASC assures. The comfort of a silence that will not be disturbed by the sudden rises of noise that cause the setting off level of the noise has eventually decreased and avoid to loose the signals that have become audible.
The Radio has always been an element of security aboard and its quality has been increased by the fact that the drivers will not have to proceed any more to manual controls of the SQUELCH neither to control the level of the noise, because.... the ASC keeps an eye for them.
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