| 摘要 |
A control system for adjusting a physical value, e.g. the resonance frequency of an oscillator comprising a bank of keys to provide the physical value as a digital word A, a microprocessor to convert the word A to a digital word B, a D/A converter to convert the word B to a voltage to control an electronic adjusting component of the oscillator, e.g. a varactor diode, and a measuring device to measure the output of the oscillator and provide a digital word C for coupling to the microprocessor. The microprocessor compares the word B with the word C and provides a correcting digital word DELTA B which is added to the word B for application to the oscillator through the D/A converter. This process is continued until the word B is equal to the word C. |
