Patent Review

patent name : AUDIO EQUALIZER PROVIDING RECIPROCAL EQUALIZATION PLUS N FINITE-DEPTH NOTCH


Audio equalizers are well-known in the art for boosting and cutting predetermined frequency ranges or bands. Ideally, an equalizer should have reciprocal, mirror image characteristics for boosting when compared to cutting. Moreover, an ideal equalizer should provide an infinite-depth notch. Audio equalizer circuit is used for adjusting the amount of boost and cut. The circuit uses a combination negative feedback, positive feedback, negative feed-forward and positive feed-forward resulting in boost and cut characteristics which are entirely reciprocal and which, nonetheless provides an infinite-depth notch. The equalizer is fabricated with an ordinary band pass filter, resistors, potentiometer and operational amplifiers. The invention relates to the field of audio equalizers and tone control. It will be obvious to one skilled in the art that the present invention may be practiced without these specific details. In other instances, well-known structures, such as operational amplifiers and band pass filters, have not be described in detail in order not to unnecessarily obscure the present invention. In the currently preferred embodiment, the audio equalizer receives an input audio signal which is coupled to a first operational amplifier. The output of the amplifier is coupled to a band pass filter and to a second operational amplifier. A positive feed-forward path couples the output of the filter to the input audio signal at the input to the second operational amplifier. A positive feedback path coupled the output of the filter to the input signal at the input of the first amplifier. A negative feedback path couples that output of the filter to the input signal at the input of the first amplifier. A negative feed-forward path couples the output of the filter to the input of the second amplifier. This results in a equalizer that has reciprocal characteristics and which provides an infinite-depth cut

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