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automatic signal processing (ASP)

Hearing aids with automatic signal processing (ASP) are designed to improve speech reproduction in the presence of strong ambient noise. ASP technology is superior to classic hearing aids

without automatic signal processing when background noise severely affects listening conditions. With automatic signal processing, not only is

thegain controlled as a function of the input signal, but also the frequency response. While traditional automatic signal processing uses automatic gain control (AGC) or compression techniques to attenuate high-level signals, this technique, called fixed frequency response

(FFR), has no dynamic effect on frequency response. It is different with the level dependent technique, Level Dependent Frequency Response (LDFR). Thus, LDFR reduces the gain of low frequencies with a high input level, while the second circuit reduces high input levels of high frequencies. The overall response of the two channels, with their programmable compressors, can be controlled according to the input signal, allowing the user to achieve optimal speech reproduction. Their characteristics can be automatically adjusted to the input signal over a wide frequency and level range.

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Englisch: automatic signal processing - ASP
Updated at: 07.07.2020
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