International Research Journal of Engineering and Technology (IRJET)
e-ISSN: 2395 -0056
Volume: 04 Issue: 02 | Feb -2017
p-ISSN: 2395-0072
www.irjet.net
STOCHASTIC COMPUTATION OF GAMMATONE FILTER BASED HEARING AID FOR IMPAIRED PEOPLE R.Priyanka [1], M.Ranjani[2], R.Vidhya[3], S.Vigneshwari[4] [1][2][3][4]UG
Students, Department of Electronics and Instrumentation, Valliammai Engineering College, Tamil Nadu, India.
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Abstract - For the people with disabilities, information
given to the auditory nerves present in the teeth. This is cost efficient and can be used easily by people.
provided through their own telecommunication devices is indispensable to move. We propose this wireless system to send information to people with disabilities (especially deaf people).The most effective way to compensate hearing loss is to employ a hearing aid system which is an integration of voice amplification, noise reduction, feedback suppression, automatic program switching, environmental adaptation, etc. This project introduces about gammatone filter based upon stochastic computation for area efficient hardware. The gammatone filter well expresses the performance of human auditory peripheral mechanism. This filter has a potential of improving advanced speech communications systems, especially hearing assisting devices and noise robust speech recognition systems. Using the gain-balancing techniques, the computation accuracy at each IIR filter is improved, leading to a high dynamic range.
2. VOICE IC Voice IC single chip used to record and playback. When the microcontroller detects the sound by sound sensor, sends the signal for recording. The Microphone present in the voice is records the sound signal. It converts the sound waves into audio signal. This audio signal which is in the form of analog signal is filtered and converted into digital signal. This signal is compressed and stored in memory. This process takes place till the microcontroller detects the sound. After the few seconds of delay in the sound, the microcontroller sends the signal to playback. This signal is in digital form, cannot be supplied to motor for our purpose. So it has to be converted to analog which is done by Pulse Width Modulated (PWM) signal generated by the microcontroller.
Key Words: Gammatone filter, IIR filter, Gain-balancing techniques.
1. INTRODUCTION There are two types of hearing loss, conductive and sensorineural hearing loss. For conductive hearing loss, there are different types of hearing aids available whereas for sensorineural hearing loss there is only surgery available that is Bone Anchored Hearing Aid. Since this surgery is done by drilling the bone near the ear. This surgery is costly and leads to uneasiness in speaking and while eating. This causes infection and need for surgery again and again. To overcome this surgery we use gammatone filter based hearing aid. Using gammatone filter enhances the dynamic range, the gain balancing technique provided splits the original small gain into larger multiple gain. Gammatone filter in voice IC is used for filtering and amplifying. Here the microcontroller is used for controlling process, when it detects a sound, it activates the voice IC and it starts to record.
Fig 1: Voice IC Module This voice IC work in two modes, serial and parallel mode. We use serial mode in which recording and replaying can be done in following way
Voice IC is used to regenerator the sound after microcontroller’s signal. This signal is converted to the required form using DC motors used in toy cars and it is
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