RCF PX1000, RX1000, RX1001, TX1000 USE, AFP – Anti-feedbackprocessor (RX 1001-AFPONLY)

AFP – Anti-feedback processor (RX 1001-AFP ONLY)

Receivers RCF RX 1001-AFP have a complex electronic section dedicated to the digital

processing of the signal received via radio. This makes it possible not only to suppress the acoustic feedback (usually a “whistling” noise), but also introduces a very useful function of frequency response equalisation.

The extreme speed and precision of identifying and eliminating the frequencies that trigger

feedbacks, the high audio quality (thanks to the 20 bit AD/DA converters) and the easy use allow radiomicrophones to work properly also in the worst ampliﬁcation conditions such as in acoustically critical environments.

The feedback problem, which normally occurs when a microphone is too close to loudspeakers or when the ampliﬁcation levels are very high, has always afﬂicted audio systems. The AFP system quickly recognises the rising feedback frequencies and eliminates them by using up to 15 highly selective dynamic ﬁlters (operating simultaneously). If necessary, the ﬁlters can be continuously shifted by the digital signal

processor (DSP) to different frequencies, in order to follow the changing conditions for the feedback rising due to the transmitter use in motion.The ﬁlter selectivity and breadth are optimised to get the best compromise between the feedback suppression and the sound quality,as ﬁlters basically remove only the acoustic energy necessary to eliminate feedbacks.

The user can choose two modes with different sensitivity about identifying and eliminating feedbacks:

•“Low”, suitable for all normal conditions;

•“High”, useful when working under extreme conditions.

USE - On the front panel of the receiver RX 1001-AFP, there is a yellow LED that indicates the AFP activation. On the receiver back panel, there are two switches: one with three positions (AFP) and the other with two positions (EQUALIZER).

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