System and method for automatically adjusting the clock phase of a display in real-time

1. A system-for adjusting clock phase in a digital display including a first analog-to-digital converter that generates a first digital signal based on an analog input signal and a first clock signal, the system comprising:

a first clock phase adjustment circuit, which is communicatively coupled to the first analog-to-digital converter, and which provides the first clock signal to the first analog-to-digital converter;

a second analog-to-digital converter that receives at least a portion of the analog input signal and a second adjusted clock signal, and that generates a second digital signal based on the input signal and the second adjusted clock signal;

a second clock phase adjustment circuit, which is communicatively coupled to the second analog-to-digital converter, and which provides the second adjusted clock signal to the second analog-to-digital converter; and

a controller, which is communicatively coupled to the second analog-to-digital converter and to the first and second clock phase adjustment circuits, the controller being adapted to determine a selected phase of the second adjusted clock signal using the second clock phase adjustment circuit and the second digital signal, and to cause the first clock phase adjustment circuit to adjust the phase of the first clock signal based on the selected phase;

wherein the analog input signal comprises a plurality of channels and the second analog to digital converter receives a single channel of the analog input signal.

2. A system for adjusting clock phase in a digital display including a first analog-to-digital converter that generates a first digital signal based on an analog input signal and a first clock signal, the system comprising:

a first clock phase adjustment circuit, which is communicatively coupled to the first analog-to-digital converter, and which provides the first clock signal to the first analog-to-digital converter;

a second analog-to-digital converter that receives at least a portion of the analog input signal and a second adjusted clock signal, and that generates a second digital signal based on the input signal and the second adjusted clock signal;

a second clock phase adjustment circuit, which is communicatively coupled to the second analog-to-digital converter, and which provides the second adjusted clock signal to the second analog-to-digital converter; and

a controller, which is communicatively coupled to the second analog-to-digital converter and to the first and second clock phase adjustment circuits, the controller being adapted to determine a selected phase of the second adjusted clock signal using the second clock phase adjustment circuit and the second digital signal, and to cause the first clock phase adjustment circuit to adjust the phase of the first clock signal based on the selected phase;

wherein the first and second clock phase adjustment circuits are adapted to select between a plurality of phases and to adjust the phase of the clock signal to a selected phase according to a signal generated by the controller.

3. The system of claim 2 wherein the first and second clock phase adjustment circuits are adapted to select between 32 different clock phases.

4. A system for adjusting clock phase in a digital display including a first analog-to-digital converter that generates a first digital signal based on an analog input signal and a first clock signal, the system comprising:

a first clock phase adjustment circuit, which is communicatively coupled to the first analog-to-digital converter, and which provides the first clock signal to the first analog-to-digital converter;

a second analog-to-digital converter that receives at least a portion of the analog input signal and a second adjusted clock signal, and that generates a second digital signal based on the input signal and the second adjusted clock signal;

a second clock phase adjustment circuit, which is communicatively coupled to the second analog-to-digital converter, and which provides the second adjusted clock signal to the second analog-to-digital converter; and

a controller, which is communicatively coupled to the second analog-to-digital converter and to the first and second clock phase adjustment circuits, the controller being adapted to determine a selected phase of the second adjusted clock signal using the second clock phase adjustment circuit and the second digital signal, and to cause the first clock phase adjustment circuit to adjust the phase of the first clock signal based on the selected phase;

wherein the controller is adapted to determine a selected phase by identifying samples that represent a stable portion of the analog input signal.

5. A system for adjusting clock phase in a digital display including a first analog-to-digital converter that generates a first digital signal based on an analog input signal and a first clock signal, the system comprising:

a first clock phase adjustment circuit, which is communicatively coupled to the first analog-to-digital converter, and which provides the first clock signal to the first analog-to-digital converter;

a second analog-to-digital converter that receives at least a portion of the analog input signal and a second adjusted clock signal, and that generates a second digital signal based on the input signal and the second adjusted clock signal;

a second clock phase adjustment circuit, which is communicatively coupled to the second analog-to-digital converter, and which provides the second adjusted clock signal to the second analog-to-digital converter; and

a controller, which is communicatively coupled to the second analog-to-digital converter and to the first and second clock phase adjustment circuits, the controller being adapted to determine a selected phase of the second adjusted clock signal using the second clock phase adjustment circuit and the second digital signal, and to cause the first clock phase adjustment circuit to adjust the phase of the first clock signal based on the selected phase;

wherein the controller causes the phase of the first clock signal to be equal to the selected phase.

6. A system for adjusting clock phase in a digital display including a first analog-to-digital converter that generates a first digital signal based on an analog input signal and a first clock signal, the system comprising:

a first clock phase adjustment circuit, which is communicatively coupled to the first analog-to-digital converter, and which provides the first clock signal to the first analog-to-digital converter;

a second analog-to-digital converter that receives at least a portion of the analog input signal and a second adjusted clock signal, and that generates a second digital signal based on the input signal and the second adjusted clock signal;

a second clock phase adjustment circuit, which is communicatively coupled to the second analog-to-digital converter, and which provides the second adjusted clock signal to the second analog-to-digital converter; and

a controller, which is communicatively coupled to the second analog-to-digital converter and to the first and second clock phase adjustment circuits, the controller being adapted to determine a selected phase of the second adjusted clock signal using the second clock phase adjustment circuit and the second digital signal, and to cause the first clock phase adjustment circuit to adjust the phase of the first clock signal based on the selected phase;

wherein the controller causes the phase of the first clock signal to be equal to the selected phase plus or minus a delta value.

7. A system for adjusting clock phase in a digital display including a first analog-to-digital converter that generates a first digital signal based on an analog input signal and a first clock signal, the system comprising:

a first clock phase adjustment circuit, which is communicatively coupled to the first analog-to-digital converter, and which provides the first clock signal to the first analog-to-digital converter;

a second analog-to-digital converter that receives at least a portion of the analog input signal and a second adjusted clock signal, and that generates a second digital signal based on the input signal and the second adjusted clock signal;

a second clock phase adjustment circuit, which is communicatively coupled to the second analog-to-digital converter, and which provides the second adjusted clock signal to the second analog-to-digital converter; and

a controller, which is communicatively coupled to the second analog-to-digital converter and to the first and second clock phase adjustment circuits, the controller being adapted to determine a selected phase of the second adjusted clock signal using the second clock phase adjustment circuit and the second digital signal, and to cause the first clock phase adjustment circuit to adjust the phase of the first clock signal based on the selected phase;

wherein the controller is adapted to automatically determine a selected phase of the second adjusted clock signal at predetermined time intervals.

8. A system for converting an analog video signal into a digital video signal for display on a digital display device, the system comprising:

a first circuit that converts the analog video signal into the digital video signal according to a first sampling clock signal; and

a second circuit that is communicatively coupled to the first circuit, that identifies a preferred phase using a second sampling clock signal and at least a portion of the analog video signal, and that causes the first circuit to update a phase of the first sampling clock signal based on the preferred phase;

wherein the first circuit comprises a first A/D converter that receives the analog video signal and samples the analog video signal according to the first sampling clock signal to generate the digital video signal, the second circuit comprises a clock phase adjustment circuit that selectively alters a phase of the second sampling clock signal;

a second A/D converter that converts at least a portion of the analog video signal to a second digital signal according to the second sampling clock signal; and a controller that causes the clock phase adjustment circuit to selectively alter the phase of the second sampling clock signal and that monitors the second digital signal to select a preferred phase; and

the controller causes the clock phase adjustment circuit to selectively alter the phase of the second sampling clock signal at predetermined time intervals.

9. A system for converting an analog video signal into a digital video signal for display on a digital display device, the system comprising:

a first circuit that converts the analog video signal into the digital video signal according to a first sampling clock signal; and

a second circuit that is communicatively coupled to the first circuit, that identifies a preferred phase using a second sampling clock signal and at least a portion of the analog video signal, and that causes the first circuit to update a phase of the first sampling clock signal based on the preferred phase;

wherein the first circuit comprises a first A/D converter that receives the analog video signal and samples the analog video signal according to the first sampling clock signal to generate the digital video signal;

the second circuit comprises a clock phase adjustment circuit that selectively alters a phase of the second sampling clock signal; a second A/D converter that converts at least a portion of the analog video signal to a second digital signal according to the second sampling clock signal;

a controller that causes the clock phase adjustment circuit to selectively alter the phase of the second sampling clock signal and that monitors the second digital signal to select a preferred phase; and

the second A/D converter is adapted to convert a single channel of the analog video signal to a second digital signal.

10. A system for converting an analog video signal into a digital video signal for display on a digital display device, the system comprising:

a first circuit that converts the analog video signal into the digital video signal according to a first sampling clock signal; and

a second circuit that is communicatively coupled to the first circuit, that identifies a preferred phase using a second sampling clock signal and at least a portion of the analog video signal, and that causes the first circuit to update a phase of the first sampling clock signal based on the preferred phase;

wherein the second circuit causes the phase of the first sampling clock signal to be equal to the preferred phase.

11. A system for converting an analog video signal into a digital video signal for display on a digital display device, the system comprising:

a first circuit that converts the analog video signal into the digital video signal according to a first sampling clock signal; and

a second circuit that is communicatively coupled to the first circuit, that identifies a preferred phase using a second sampling clock signal and at least a portion of the analog video signal, and that causes the first circuit to update a phase of the first sampling clock signal based on the preferred phase;

wherein the second circuit causes the phase of the first sampling clock signal to be equal to the preferred phase plus or minus a delta value.

12. A display device comprising:

a display monitor for displaying of an image provided to the display monitor by a video source; and

an A/D conversion circuit that is communicatively coupled to the display monitor, the A/D conversion circuit including a first A/D converter that uses a first clock signal to convert an analog input signal from the video source into a first digital signal that is used by the display monitor to display an image, and a clock phase adjustment system for adjusting a phase of the first clock signal, the clock phase adjustment system comprising:

a first clock phase adjustment circuit, which is communicatively coupled to the first A/D converter, and which provides the first clock signal to the first A/D converter;

a second A/D converter that receives at least a portion of the analog input signal and that converts the received signal into a second digital signal;

a second clock phase adjustment circuit, which is communicatively coupled to the second A/D converter, and which provides a second clock signal to the second A/D converter; and

a controller, which is communicatively coupled to the second A/D converter and to the first and second clock phase adjustment circuits, the controller being adapted to determine a preferred phase of the second clock signal using the second clock phase adjustment circuit and the second digital signal, and to cause the first clock phase adjustment circuit to adjust the phase of the first clock signal based on the preferred phase;

wherein the analog input signal comprises multi-channel signal and the second A/D converter receives a single channel of the analog input signal.

13. A display device comprising:

a display monitor for displaying of an image provided to the display monitor by a video source; and

an A/D conversion circuit that is communicatively coupled to the display monitor, the A/D conversion circuit including a first A/D converter that uses a first clock signal to convert an analog input signal from the video source into a first digital signal that is used by the display monitor to display an image, and a clock phase adjustment system for adjusting a phase of the first clock signal, the clock phase adjustment system comprising:

a first clock phase adjustment circuit, which is communicatively coupled to the first A/D converter, and which provides the first clock signal to the first A/D converter;

a second A/D converter that receives at least a portion of the analog input signal and that converts the received signal into a second digital signal;

a second clock phase adjustment circuit, which is communicatively coupled to the second A/D converter, and which provides a second clock signal to the second A/D converter; and

a controller, which is communicatively coupled to the second A/D converter and to the first and second clock phase adjustment circuits, the controller being adapted to determine as a function of only one clock signal input, a preferred phase of the second clock signal using the second clock phase adjustment circuit and the second digital signal, and to cause the first clock phase adjustment circuit to adjust the phase of the first clock signal based on the preferred phase

wherein the analog input signal comprises multi-channel signal and the second A/D converter is adapted to convert a single channel of the analog input signal to a second digital signal.

14. A display device comprising:

a display monitor for displaying of an image provided to the display monitor by a video source; and

an A/D conversion circuit that is communicatively coupled to the display monitor, the A/D conversion circuit including a first A/D converter that uses a first clock signal to convert an analog input signal from the video source into a first digital signal that is used by the display monitor to display an image, and a clock phase adjustment system for adjusting a phase of the first clock signal, the clock phase adjustment system comprising:

a first clock phase adjustment circuit, which is communicatively coupled to the first A/D converter, and which provides the first clock signal to the first A/D converter;

a second A/D converter that receives at least a portion of the analog input signal and that converts the received signal into a second digital signal;

a second clock phase adjustment circuit, which is communicatively coupled to the second A/D converter, and which provides a second clock signal to the second A/D converter; and

a controller, which is communicatively coupled to the second A/D converter and to the first and second clock phase adjustment circuits, the controller being adapted to determine a preferred phase of the second clock signal using the second clock phase adjustment circuit and the second digital signal, and to cause the first clock phase adjustment circuit to adjust the phase of the first clock signal based on the preferred phase, wherein the controller causes the phase of the first clock signal to be equal to the preferred phase.

15. A display device comprising:

a display monitor for displaying of an image provided to the display monitor by a video source; and

an A/D conversion circuit that is communicatively coupled to the display monitor, the A/D conversion circuit including a first A/D converter that uses a first clock signal to convert an analog input signal from the video source into a first digital signal that is used by the display monitor to display an image, and a clock phase adjustment system for adjusting a phase of the first clock signal, the clock phase adjustment system comprising:

a first clock phase adjustment circuit, which is communicatively coupled to the first A/D converter, and which provides the first clock signal to the first A/D converter;

a second A/D converter that receives at least a portion of the analog input signal and that converts the received signal into a second digital signal;

a second clock phase adjustment circuit, which is communicatively coupled to the second A/D converter, and which provides a second clock signal to the second A/D converter; and

a controller, which is communicatively coupled to the second A/D converter and to the first and second clock phase adjustment circuits, the controller being adapted to determine a preferred phase of the second clock signal using the second clock phase adjustment circuit and the second digital signal, and to cause the first clock phase adjustment circuit to adjust the phase of the first clock signal based on the preferred phase, wherein the controller causes the phase of the first clock signal to be equal to the preferred phase plus or minus a delta value.

16. A method of adjusting a phase of a first clock signal that controls analog-to-digital conversion in a digital display process, the method comprising:

providing a second clock signal;

determining a preferred phase using the second clock signal and at least a portion of an analog input signal; and

adjusting the phase of the first clock signal based on the preferred phase, wherein the phase of the first clock signal is adjusted to be equal to the preferred phase.

17. A method of adjusting a phase of a first clock signal that controls analog-to-digital conversion in a digital display process, the method comprising:

providing a second clock signal;

determining a preferred phase using the second clock signal and at least a portion of an analog input signal; and

adjusting the phase of the first clock signal based on the preferred phase, wherein the phase of the first clock signal is adjusted to be equal to the preferred phase plus or minus a delta value.

18. A method of adjusting a phase of a first clock signal that controls analog-to-digital conversion in a digital display process, the method comprising:

providing a second clock signal;

determining a preferred phase using the second clock signal and at least a portion of an analog input signal; and

adjusting the phase of the first clock signal based on the preferred phase;

wherein the analog input signal comprises at least three channels, and wherein a single channel of the analog input signal is used to determine the provided to the second analog to digital converter.