| 摘要 |
A memory-type control system for producing and storing a control signal which is used in an automatic adjustment system. A signal, having a parameter to be controlled, is provided; and a detecting circuit detects when the parameter is within a predetermined range. An UP/DOWN counter counts clock pulses and is responsive to the detecting circuit for counting in one direction when the detected parameter is greater than the predetermined range, for counting in a second direction when the detected parameter is less than the predetermined range and for ceasing its counting when the detected parameter is within the predetermined range. A parameter control circuit uses the count of the counting means as a control signal to adjust the parameter so as to bring said parameter within the predetermined range. A typical application of the automatic adjustment system is a white-balance control system for use with video camera apparatus. |
