Karaoke vocal enhancement circuit

Designing audio circuits is certainly the job of electronic engineers, but if electronic engineers do not learn a little about acoustics, what they design can only be called machines rather than audio. Although most audio equipment manufacturers often boast about how profound their understanding of music is, you don't have to take it too seriously. The karaoke vocal enhancement circuit introduced below is a small masterpiece of the author. In the past, the author worked as a designer in a well-known audio equipment manufacturer. In the design of an entry-level karaoke amplifier, the author connected this circuit behind the microphone amplifier circuit. As a result, the karaoke singing effect of this machine exceeded that of the high-end machines of the same factory, which surprised those senior engineers and bosses. The secret was a secret at the time.
The circuit is very simple, with two filters of the same structure. One increases the frequency at 150Hz, making the human voice full and full of breath, and the other increases the frequency at 2400Hz, making the human voice bright and the sibilance is also well expressed. The improvement of the effect is based on the principle of sound wave sound perception analysis in acoustic knowledge, and the circuit is the means to achieve it. The following is the frequency response diagram of this circuit. It is simple to say and looks simple, but when you sing it, it has a bit of the flavor of a singer!