4 HEAD SWITCHING CONTROL HEAD AND METHOD THEREOF

摘要

The circuit includes a microprocessor (10) for controlling a timer and the whole system. A first switching means performs rotary switching under the control of the microprocessor (10) to decide which of four heads is to be selected so as to carry out a reading function. A second switching means performs head amplification switching under the control of the microprocessor (10) to decide which of four heads is to be selected to carry out a reading function. The first and second switching means are controlled by the combination of envelope signals and head switching signals. The circuit improves the picture quality and saves the manufacturing cost.