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Speech processing using wavelete transformation and its implementation in digital hearing aids

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  1. Abstract
  2. Normal cochlear function
  3. Hearing aids
    1. Analog hearing aids
    2. Digital hearing aids
  4. Speech enhancement using wavelet
    1. Daubechies wavelet filter coefficients
    2. Discrete wavelet transform
    3. Algorithm
  5. Results
  6. Conclusion
  7. References

Hearing impairment is the number one chronic disability affecting people in the world. Many people have great difficulty in understanding speech with background noise. This is especially true for a large number of elderly people and the sensorineural impaired persons. Several investigations on speech intelligibility have demonstrated that subjects with sensorineural loss may need a 5-15 dB higher signal-to-noise ratio than the normal hearing subjects. While most defects in transmission chain up to cochlea can nowadays be successfully rehabilitated by means of surgery, the great majority of the remaining inoperable cases are sensorineural hearing impaired. Recent statistics of the hearing impaired patients applying for a hearing aid reveal that 20% of the cases are due to conductive losses, more than 50% are due to sensorineud losses, and the rest 30% of the cases are of mixed origin.

[...] In both the cases, it is-difficult to obtain and evaluate various frequency response characteristics Digital hearing aids In digital hearing aid, a microprocessor or ASIC replaces the hardware used to process the signal (e.g., filtering, compression). The analog output of the microphone will be low-pass-filtered to prevent aliasing errors, sampled at discrete intervals, and will be converted to binary form using an analog-to-digital converter. The digital signal will be processed in the manner in which the microprocessor has been programmed. [...]

[...] are shown in Fig The outer ear and ear canal collect sound, which is directed to the eardrum. The ear canal acts as a quarter wavelength resonator, which increases the acoustic signal level over a frequency range from 1 kHz to 3 kHz. The middle ear includes the eardrum and three small bones (ossicles) that conduct sound from the canal to the inner ear. The middle ear structures vibrate in complex modes and serve as an impedance transformer between airborne sound in the ear canal and fluid-borne sound in the inner ear. [...]

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