The video circuit described in this paper combines audio subcarriers Piezoelectric Rings For Ultrasonic Machining
Ultrasonic processing is a special processing tool that uses ultrasonic frequency to vibrate at small amplitudes, and through the impact of the abrasive free of liquid between it and the workpiece on the processed surface, the surface of the workpiece material is gradually broken.
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Figure 2. Gain and group delay frequency response of the notch and group delay compensation circuits shown in Figure 1.
The center frequency of the notch is set by L2 and C2; the notch depth and bandwidth are set by R4, R5, and R6. Typical notch depth is greater than -16dB, and gain flatness above 2.5MHz is ±0.5dB.