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Analogue micropowered log-domain tone controller for auditory prostheses

Analogue micropowered log-domain tone controller for auditory prostheses

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A micropower tone-control circuit comprising two first-order log-domain filters and a subtractor built with MOS transistors in weak inversion is described. The tone-controller is capable of providing bass cut/boost and treble cut operations. This circuit is being used in new designs of a conventional (acoustic) hearing-aid and cochlear implant.

References

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      • C. Toumazou , J. Ngarnmil , T.S. Lande . Micropower log-domain filter for electronic cochlea. Electron. Lett. , 22 , 1839 - 1841
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      • Ngarnmil, J., Toumazou, C., Lande, T.S.: `A fully tuneable micropowerlog-domain filter', 21st European Solid State Circuits Conf., ESSCIRC'95, September 1995, France.
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      • D.K. Eddington , W.H. Dobelle , D.E. Brackmann , M.G. Mladejovsky , J.L. Parkin . Auditory prostheses research with multiple channel intracochlearstimulation in man. Ann. Otology, Rhinology & Laryngology, Supp. 53 , 6
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