Cochlear SPrint Sound Processor Technical Information download pdf (Page 42)

SECTION ONE | CLINICAL GUIDANCE

Focus with the Freedom Sound Processor

The Freedom sound processor implements the beam algorithm using one

dual port directional and one omni-directional microphone. The beamformer

output is formed by combining the signals from two microphones, the

directional microphone at the front of the sound processor and the

omnidirectional microphone at the rear of the processor.

There are two stages to the adaptive beamformer (see Figure 13). The ﬁrst

stage comprizes the beamformer operation while the second stage comprizes

an adaptive noise cancellation operation.

The beamformer output is formed by combining the signals from two

microphones, the directional microphone at the front of the sound processor

and the omnidirectional microphone at the rear of the processor.

The beamformer has ﬁxed directionality. It is optimized to have maximum

sensitivity at 0˚, and maximum suppression of signals arriving from 90˚ to 270˚

(see Figure 14).

Figure 13 : A block

diagram of the

two-stage adaptive

beamformer.

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Cochlear SPrint Sound Processor Technical Information Page 42