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  • Electric audio signal amplifiers designed to amplify speech signals, typically in a range from a few hundred hertz to 15 kHz. These amplifiers typically consist of a wide-band, high-fidelity, electronic amplifier with audio signal inputs, electronic circuits to amplify the signal, controls (e.g., gain, frequency response), appropriate output ports for the amplified signals, and a power supply. Speech amplifiers have particular characteristics according to the intended use; they are frequently included as attached units and/or integral parts of hearing aids, cochlear implants, artificial larynxes, telephone sets, and/or in patient aids for people with very weak voices.
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