Retraction Note: Noise diminution and formant extraction on vowels for hearing aid users

People suffering from hearing loss have great difficulty to hear even with the help of hearing aids due to background noises. The problem of reducing noise in hearing aids still remains as a toughest problem to solve. A speech upgrade method to be specific, a modified spectral subtraction is proposed to decrease the different foundation noises and its execution is tried with target quality estimation parameter like signal to noise ratio (SNR) and perceptual evaluation of speech quality (PESQ), and furthermore Vowels are thought to be voiced sounds with more vitality for discourse creation. And hence from the enhanced speech signal the formant frequency of the voiced vowels is extracted based on autocorrelation method and in future work thereby increase the intelligibility of the vowels by enhancing the formants for the hearing aid listeners.