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A Low-Power Wide-Dynamic-Range Analog VLSI Cochlea

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Abstract

Low-power wide-dynamic-range systems are extremely hard to build. The biological cochlea is one of the most awesome examples of such a system: It can sense sounds over 12 orders of magnitude in intensity, with an estimated power dissipation of only a few tens of microwatts. In this paper, we describe an analog electronic cochlea that processes sounds over 6 orders of magnitude in intensity, and that dissipates 0.5 mW. This 117-stage, 100 Hz to 10 KHz cochlea has the widest dynamic range of any artificial cochlea built to date. The wide dynamic range is attained through the use of a wide-linear-range transconductance amplifier, of a low-noise filter topology, of dynamic gain control (AGC) at each cochlear stage, and of an architecture that we refer to as overlapping cochlear cascades. The operation of the cochlea is made robust through the use of automatic offset-compensation circuitry. A BiCMOS circuit approach helps us to attain nearly scale-invariant behavior and good matching at all frequencies. The synthesis and analysis of our artificial cochlea yields insight into why the human cochlea uses an active traveling-wave mechanism to sense sounds, instead of using bandpass filters. The low power, wide dynamic range, and biological realism make our cochlea well suited as a front end for cochlear implants.

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References

  1. R. Sarpeshkar, T. Delbrück, and C. Mead, “White Noise in MOS Transistors and Resistors.” IEEE Circuits and Devices, 9(6), pp. 23–29, Nov. 1993.

    Google Scholar 

  2. B. M. Johnstone, “Genesis of the Cochlear Endolymphatic Potential.” Current Topics in Bioenergetics 2, pp. 335–352, 1967.

    Google Scholar 

  3. B. C. J. Moore, An Introduction to the Psychology of Hearing, Third Edition. Academic Press Limited, London, 1989.

    Google Scholar 

  4. C. A. Mead, Analog VLSI and Neural Systems. Addison-Wesley Publishing Co., Reading, MA, 1989.

    Google Scholar 

  5. W. Liu, An Analog Cochlear Model: Signal Representation and VLSI Realization. PhD. Thesis, John Hopkins University, Baltimore, Maryland, 1992.

  6. L. Watts, D. A. Kerns, R. F. Lyon, and C. A. Mead, “Improved Implementation of the silicon cochlea.” IEEE Journal of Solid-State Circuits 27(5), pp. 692–700, May 1992.

    Google Scholar 

  7. N. Bhadambkar, “A variable resolution nonlinear silicon cochlea.” Technical Report CSL-TR-93-558, Stanford University, 1993.

  8. A. van Schaik, E. Fragniere, and E. Vittoz, “Improved Silicon Cochlea using Compatible Lateral Bipolar Transistors.” Advances in Neural Information Processing Systems 8, pp. 671–677, edited by D. Touretzky, et al., MIT Press, Cambridge, MA 1996.

    Google Scholar 

  9. R. Sarpeshkar, R. F. Lyon, and C. A. Mead, “An Analog VLSI Cochlea with New Transconductance Amplifiers and Nonlinear Gain Control.” Proceedings of the IEEE Symposium on Circuits and Systems Atlanta, 3, pp. 292–295, May 1996.

    Google Scholar 

  10. R. Sarpeshkar, R. F. Lyon, and C. A. Mead, “A low-power wide-linear-range transconductance amplifier.” Analog Integrated Circuits and Signal Processing 13(1/2), pp. 123–151, May/June 1997.

    Google Scholar 

  11. R. J.W. Wang, R. Sarpeshkar, M. Jabri, and C. Mead, “A Low-Power Analog Front-end Module for Cochlear Implants.” Presented at the XVI World Congress on Otorhinolaryngology, Sydney March 1997.

  12. M. A. Ruggero, “Response to Sound of the Basilar Membrane of the Mammalian Cochlea.” Current Opinion in Neurobiology 2, pp. 449–456, 1992.

    Google Scholar 

  13. T. D. Clack, J. Erdreich, and R. W. Knighton, “Aural Harmonics: The Monoaural Phase Effects at 1500 Hz, 2000 Hz, and 2500 Hz Observed in Tone-on-Tone Masking When f 1 = 1000 Hz.” Journal of the Acoustical Society of America 52(2) (Part 2), pp. 536–541, 1972.

    Google Scholar 

  14. C. D. Summerfield and R. F. Lyon, “ASIC Implementation of the Lyon Cochlea Model.” Proc. IEEE International Conference on Acoustics, Speech, and Signal Processing. San Fransisco, March 1992.

  15. G. Clark, “Cochlear Implants: Future Research Directions.” Annals of Otology, Rhinology, and Laryngology 104(9), (Part 2), pp. 22–27, 1995.

    Google Scholar 

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Authors and Affiliations

  1. Department of Biological Computation, Bell Laboratories, Murray Hill, NJ, d07974

    Rahul Sarpeshkar

  2. Foreonics, Inc., Cupertino, CA, 95014

    Richard F. Lyon

  3. Physics of Computation Laboratory, California Institute of Technology, Pasadena, CA, 91125

    Carver Mead

Authors
  1. Rahul Sarpeshkar
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  2. Richard F. Lyon
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  3. Carver Mead
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Sarpeshkar, R., Lyon, R.F. & Mead, C. A Low-Power Wide-Dynamic-Range Analog VLSI Cochlea. Analog Integrated Circuits and Signal Processing 16, 245–274 (1998). https://doi.org/10.1023/A:1008218308069

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  • DOI: https://doi.org/10.1023/A:1008218308069

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