This tool for visually-impaired users essentially turns the trackpad into a screen reader, supporting special gestures to switch between windows and audio feedback when clicking.
Experiments and simulations show that the proposed system can operate in audioswitch frequency range without audio noise from the motor load, meanwhile, EMI can be limited to low level.
实验与仿真结果表明：该系统采用音频开关而不导致电机负载的音频噪声，同时使EMI能被限制在低电平。
3
The outlook of high frequency switch power supply in application to high fidelity audio frequency power amplifier is indicated.