| 主权项 |
1. A method of generating electrical signal waveforms by a generator, the generator comprising a digital processing circuit, a memory circuit in communication with the digital processing circuit, the memory circuit defining first and second lookup tables, a digital synthesis circuit in communication with the digital processing circuit and the memory circuit, and a digital-to-analog (DAC) circuit, the method comprising:
storing, by the digital processing circuit, phase points of a first digital electrical signal waveform in a first lookup table defined by the memory circuit, wherein the first digital electrical signal waveform is represented by a first predetermined number of phase points, wherein the first predetermined number of phase points define a first predetermined wave shape; storing, by the digital processing circuit, phase points of a second digital electrical signal waveform in a second lookup table defined by the memory circuit, wherein the second digital electrical signal waveform is represented by a second predetermined number of phase points, wherein the second predetermined number of phase points define a second predetermined wave shape; and receiving a clock signal by the digital synthesis circuit, and at each clock cycle:
retrieving, by the digital synthesis circuit, a phase point from the first lookup table;retrieving, by the digital synthesis circuit, a phase point from the second lookup table;combining, by the digital processing circuit, the phase point from the first lookup table with the phase point from the second lookup table to generate a combined phase point; andconverting, by the DAC circuit, the combined phase point into an analog signal;wherein the analog signal is configured to drive a first and second ultrasonic transducer. |
