Improved Audio Filtering Using Extended High Pass Filters

Noise Filtering in audio signals has always been a challenge since the noise is spread across a large bandwidth and overlaps the spectral range of the audio signal being recovered. In audio systems all these can be kept below the audible level but ambient noise may not be avoided even if the audio system is designed according to the best practices. So, there have been several audio filtering techniques such as spectral subtraction, Dolby noise reduction, use of low-pass and high pass were assessed for both noise reduction and signal filters, FIR and IIR filtering, etc. Noise filtering improvements degradation effects by different signal to noise ratio computations.