Noise reduction systems.
Most high fidelity cassette decks incorporate
a noise reduction system, of which the most common is the Dolby B version that
uses a huge percentage of devices on the market. This electronic noise
reduction system appreciates the level of signal reaching the recording head;
If it is very high, it does not act; If on the other hand its value is weak, it
increases its amplitude and later allows the recording to take place.
When
reproducing this signal along with the tape noise is reduced its value in the
same proportion as it was increased in the register. The result is that the
noise is attenuated artificially the same number of times as the signal.
There
are other noise reduction systems such as DBX, SUPER D, ANRS, DNL, ADRES,
HIGH-COM which are also sometimes used in certain brands although their use is
not as widespread as that of Dolby B on decks to cassette.
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