Abstract
An apparatus and method for processing sound, suitable for use in association with a hearing aid, cochlear implant prosthesis or the like. Coupled to an array of microphones (1) are a pair of fixed array processors (2,4) each having different characteristic signal-to-noise performances and internal noise parameters in different levels of ambient noise. Based upon an ambient noise estimate derived from noise floor detector (8) a control circuit (5) controls the gain of a pair of VCA's (7,9) coupled to the fixed array processors (2,4) in order to produce an output signal from summer (16) which maximises the signal-tonoise ratio of a signal emanating from a source in an on-beam direction relative to the microphone array (10).
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