| 摘要 |
<p>The switching circuit includes a power saving circuit and a frequency switching circuit (1031). The power saving circuit produces microprocessor action voltage to control its vertical, horizontal sync signal output when the power supply is ON. Whilst the frequency switching circuit adjusts base frequency from 31-38 KHz into 15 KHz. The switching circuit also includes an automatic control circuit (1032) for the control of the analog/digital conversion frequency, an adjustment circuit (1033) for frequency adjustment. The frequency switching is achieved through a relay ON adjusting the frequency as above for direct display of the 15 KHz line.</p> |
