| 摘要 |
PURPOSE:To attain more accurate frequency equalization by connecting a resonance circuit directly to a signal source and adjusting the frequency characteristic of a series resonance circuit near the resonance frequency based on an original signal and a signal resulting from the signal given to the said series resonance circuit After impedance conversion through a buffer amplifier. CONSTITUTION:A signal source P connects to a noninverting input of an amplifier G1 via a resistor R1 and also connects to other terminal of a series resonance circuit comprising a capacitor C1 connecting to ground through a coil L1 and connecting to a resistor R4 in series./A connecting point between the resistor R4 and the capacitor C1 connects to a buffer amplifier G2 applying impedance conversion to a signal coming from the connecting point, and the frequency characteristic of the series resonance circuit around its resonance frequency is adjusted based on an output of the buffer amplifier G2 and a signal from the signal source. Thus, the frequency equalizing circuit whose Q characteristic is constant is realized and accurate frequency equalization is implemented. |
