Patent ID: 7715579
Filing Date: 2010-05-11
Classification: H03G,H04R

Abstract:
1. A tone control circuit for a hearing aid for receiving an input signal and providing a tone adjusted output signal, comprising: a control circuit signal input for receiving the input signal; an inverting amplifier having an inverting input and an amplifier output which outputs said tone adjusted output signal; a low pass filter series circuit having a low pass filter input terminal, a low pass filter output terminal, and a low pass filter control node; said low pass filter series circuit including a low pass filter fixed resistor connected in series with a low pass filter capacitor at a low pass filter series connection node, wherein: a high pass filter series circuit having a high pass filter input terminal, a high pass filter output terminal, and a high pass filter control node; said high pass filter series circuit including a high pass filter fixed resistor connected in series with a high pass filter capacitor at a high pass filter series connection node, wherein: said low pass filter series circuit being connected in parallel to said high pass filter series circuit by parallel connections including said low pass filter input terminal being connected to said high pass filter input terminal, and said low pass filter output terminal being connected to said high pass filter output terminal; a filter control circuit having a first control input terminal connected to said low pass filter control node, a second control input terminal connected to said high pass filter control node, and said filter control circuit including a variable resistor having: said filter control circuit being configured such that: