Hearing aid amplifier having feed forward bias control based on signal amplitude and frequency for reduced power consumption
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United States of America Patent
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Apr 12, 2016
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N/A
app pub date -
Apr 11, 2012
filing date -
Apr 11, 2012
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Abstract
A hearing aid is disclosed, which can autonomously track the bias current requirements of its output amplifier and control the current bias accordingly, resulting in less power consumption than if the bias current were delivered at a constant, worst-case level. An input signal is split into different frequency bands. A volume envelope is formed for each frequency band, which may function like an instantaneous volume level for each frequency band. The volume envelopes are weighted by frequency, with high frequencies being weighted more heavily than low frequencies. The weighted volume envelopes are used to calculate a dynamic bias current level, and a current with that level is provided to the output amplifier of the hearing aid. In some cases, the narrowband input signals for the frequency bands are amplified with respective predetermined gains, and are then combined to form a broadband output signal, which is sent to the output amplifier.
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