This device improves selectivity by increasing rejection of signals on adjacent frequencies. Circuitry in which analog signals, such as audio or radio signals, are converted into digital form, manipulated and processed while in digital form, and then converted back to analog form. A measure of the strongest received signal that a receiver can handle with overloading or distortion. It is measured in decibels. These allow storing of frequencies of favorite stations.
Some receivers allow storing of mode, receiver bandwidth, etc., in addition to frequency.
This circuit reduces noise due to electrical equipment, lightning, neon lights, etc. Noise limiters are simpler circuits that limit the maximum strength of noise pulses, while more complex noise blankers actually silence the receiver during noise pulses. While this circuits can help reduce noise, they cannot eliminate noise and often introduce some audio distortion. A circuit that allows you to move the selectivity bandwidth above or below the frequency to which the radio is tuned. This is often helpful in reducing interference.