IP Library › Granted Patent US 6,909,428
Granted Patent B2
US 6,909,428 · App. 10/000,565 · Granted Jun 21, 2005

Signal converter device

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Quick Facts
Patent No.
US 6,909,428
App. No.
10/000,565
Granted
Jun 21, 2005
Kind
B2
Abstract

The present invention provides a device for signal transfer, which outputs a treatment signal relating to a vertical-horizontal composite sync signal of a monitor and an integrated signal of the vertical-horizontal composite sync signal. There is a plurality of logic circuits in the device of the present invention. The first logic circuit is provided for receiving the vertical-horizontal composite sync signal and the integrated signal, and outputs a high level signal when the voltage level of the vertical-horizontal composite sync signal transforms from the high level to the low level while the voltage level of the integrated signal is in the low level. The second logic circuit is connected to the first logic circuit and receives the vertical-horizontal composite sync signal and the signal outputted from the first logic circuit. The second logic circuit outputs a low level signal when the voltage level of the vertical-horizontal composite sync signal is transformed from the low level to the high level while the voltage level of the signal outputted from the first logic circuit is at the high level. The third logic circuit receives the vertical-horizontal composite sync signal and the signal outputted from the first logic circuit. The third logic circuit outputs a low level signal when the voltage level of the vertical-horizontal composite sync signal and the signal outputted from the first logic circuit is at the low level. The fourth logic circuit receives the signal outputted from the second logic circuit and the third logic circuit. The fourth logic circuit outputs a high level signal when the voltage level of the signals outputted from the second logic circuit and the third logic circuit are at the high level.

Claims (16)

1. A device for signal transferring, which outputs a treatment signal relating to a vertical-horizontal composite sync signal of a monitor and an integrated signal of the vertical-horizontal composite sync signal, comprising:

a first logic circuit, which receives the vertical-horizontal composite sync signal and the integrated signal, the first logic circuit outputs a high level signal when the voltage level of the vertical-horizontal composite sync signal is transformed from the high level to the low level while the voltage level of the integrated signal is in the low level;

a second logic circuit connected to the first logic circuit, which receives the vertical-horizontal composite sync signal and the signal outputted from the first logic circuit, the second logic circuit outputs a low level signal when the voltage level of the vertical-horizontal composite sync signal that is transformed from the low level to the high level while the voltage level of the signal outputted from the first logic circuit is in the high level;

a third logic circuit, which receives the vertical-horizontal composite sync signal and the signal outputted from the first logic circuit, the third logic circuit outputs a low level signal when the voltage level of the vertical-horizontal composite sync signal and the signal outputted from the first logic circuit is at the low level; and

a fourth logic circuit, which receives the signal outputted from the second logic circuit and the third logic circuit, the fourth logic circuit outputs a high level signal when the voltage level of the signals outputted from the second logic circuit and the third logic circuit are at the high level.

2. The device as claimed in claim 1 , further comprising an integrator for integrating the vertical-horizontal composite sync signal to the integrated signal.

3. The device as claimed in claim 2 , wherein the first logic circuit further comprising:

a first logic element, which receives the vertical-horizontal composite sync signal and the integrated signal, the first logic unit outputs a low level signal when the voltage level of the vertical-horizontal composite sync signal is transformed from the high level to the low level while the voltage level of the integrated signal is at the low level;

a second logic element, which receives the vertical-horizontal composite sync signal and the signal outputted from the first logic element, the second logic unit outputs a first specific signal when the voltage level of the vertical-horizontal composite sync signal is transformed from the low level to the high level while the voltage level of the signal outputted from the first logic unit is at the high level; and

a third logic element, which receives the vertical-horizontal composite sync signal and the signal outputted from the second logic element, the third logic unit outputs a second specific signal to the second logic circuit when the voltage level of the vertical-horizontal composite sync signal is transformed from the high level to the low level while the voltage level of the signal outputted from the second logic unit is at the high level.

4. The device as claimed in claim 3 , wherein the first specific signal is a square-wave having a first width.

5. The device as claimed in claim 4 , wherein the second specific signal is a square-wave having a second width.

6. The device as claimed in claim 5 , wherein the first width and the second width are controlled by related RC-circuits.

7. The device as claimed in claim 6 , wherein the third logic circuit is an OR-gate.

8. The device as claimed in claim 7 , wherein the fourth logic circuit is an AND-gate.

9. The device as claimed in claim 2 , wherein the integrator is a RC-integrator.