I am looking for a circuit for an inverse notch filter. Several full range transducers shows unwanted notch filter in the frequency response. In opposite to unwanted peaks such narrowband minimums are not compensate by passive devices.
But a parametric equalizer is able to compensate this.
I want to have an circuit, which is only able to enhance this narrowband minimum and must have an inverse function of the circuit from the follow link:
60 Hz Biquad Notch Filter schematic
The schematic must be much more easy than such from a parametric equalizer.
Where I can find such schematics?
Which op-Amps are the best choice for this application?
The circuit must not have any influence on the sound quality - this is very important.
Thank you for your advices.
But a parametric equalizer is able to compensate this.
I want to have an circuit, which is only able to enhance this narrowband minimum and must have an inverse function of the circuit from the follow link:
60 Hz Biquad Notch Filter schematic
The schematic must be much more easy than such from a parametric equalizer.
Where I can find such schematics?
Which op-Amps are the best choice for this application?
The circuit must not have any influence on the sound quality - this is very important.
Thank you for your advices.
Last edited:
I really think you are after a parametric equaliser!!!
These are not that complex, and you will undoubtedly be looking for the ability to tune the frequency, Q and depth of the equalisation you are adding.
As an aside, unless the notch in frequency response is really (and I mean really) significant, you probably want to consider the pro's and con's of inserting significant compensation. You will be trading the notch against interesting phase shifts and increased power requirements across the equalised band.
These are not that complex, and you will undoubtedly be looking for the ability to tune the frequency, Q and depth of the equalisation you are adding.
As an aside, unless the notch in frequency response is really (and I mean really) significant, you probably want to consider the pro's and con's of inserting significant compensation. You will be trading the notch against interesting phase shifts and increased power requirements across the equalised band.
Speaker responses are nearly always good approximations of minimum phase behaviour. So minimum phase EQ, as proposed here, usually provides good correction in both magnitude and phase. Also, most systems are overbuilt and have poor gain structure. Meaning an additional bit of swing and power from narrowband boost tends not to be difficult to accommodate.
tiefbassuebertr, if you want simpler than a fixed implementation of a parametric EQ biquad DSP is the place to look. For analog implementation the considerations are no different from any other audio op amp selection. Best to defer specific discussion until after a circuit's been roughed in.
tiefbassuebertr, if you want simpler than a fixed implementation of a parametric EQ biquad DSP is the place to look. For analog implementation the considerations are no different from any other audio op amp selection. Best to defer specific discussion until after a circuit's been roughed in.
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