Hearing aid with controllable wide range of frequency response

A hearing aid having a wide range of frequency response, comprising:

• microphone input means responsive to sound waves for generating an electrical signal representative of the sound waves;
• high pass filter means for filtering said electrical signal, said high pass filter means generating a first signal representative of the high frequency portions of said electrical signal;
• low pass filter means receiving both said electrical signal and said second signal, said low pass filter means generating a second signal representative of the amplitude subtraction of said last named signals;
• proportioning means combining a selected amplitude portion of said first signal with a selected amplitude portion of said second signal for generating an output signal, said proportioning means minimizing frequency effects in said output signals in the frequency range where said high pass filter means and low pass filter means overlap,
• control means connected to said proportioning means and manually adjustable for controlling the selected amplitude portions of said first and said second signals;
• and
• output means responsive to said output signal for enhancing the hearing of sound waves by a wearer of the hearing aid.