Infrared remote control receiver and system

• US 20050047794A1
• Filed: 08/29/2003
• Published: 03/03/2005
• Est. Priority Date: 08/29/2003
• Status: Abandoned Application

• Current Assignee: Niles Audio Corporation (Melrose Industries Plc)
• Original Assignee: Niles Audio Corporation (Melrose Industries Plc)
• Inventors: Quintanar, Felix Clarence
• Application Number:
  US10/651,399
• Publication Number:
  US 20050047794A1
• Time in Patent Office: Days
• US Class Current: 398/149
• CPC Class Codes: G08C 23/04 using light waves, e.g. infrared

Abstract

The present invention provides an infrared remote control receiver with increased suppression of unwanted light, signals, or interference, specifically suppression of interference from plasma television displays and fluorescent light. The infrared remote control receiver may be used in remote control applications whereby it is connected between at least one remote control unit and at least one device or component that is intended to be operated. The receiver also contains status and infrared activity indicators, which indicate whether the individual components of the system are powered and whether the receiver is receiving an infrared signal. The receiver eliminates or reduces interference received by the receiver using a method of processing signals that changes the voltage reference level if the signal is determined to be noise and maintains the noise level at an established limit.

Claims

1. An infrared remote control receiver with improved noise suppression comprising:

an optional optical magnifier;

an interference filter;

at least one pin photodiode;

an input amplifier;

a microcontroller;

an output amplifier;

an output port; and

a power supply regulator.

2. The receiver of claim 1, further including an infrared activity indicator.

3. The receiver of claim 2, wherein said infrared activity indicator indicates whether said receiver is receiving a signal by activation of a LED.

4. The receiver of claim 2, wherein said infrared activity indicator may be deactivated after installation.

5. The receiver of claim 1, further including a status indicator that indicates whether each device within a system is powered.

6. The receiver, of claim 1, wherein said optical magnifier is a lens.

7. The receiver of claim 1, wherein said interference filter is a bandpass glass interference filter.

8. The receiver of claim 7, wherein said bandpass glass interference filter ranges from about 950+/−

12.5 nanometers to about 950+/−

20 nanometers.

9. The receiver of claim 1, wherein said at least one pin photodiode comprises a radiant sensitive area of about 7.5 square millimeters.

10. The receiver of claim 1, wherein said input amplifier uses a high impedance and an overall high gain.

11. The receiver of claim 10, wherein said input amplifier increases the amplitude of a signal with an infrared carrier frequency from about 20 kilohertz to about 110 kilohertz.

12. The receiver of claim 1, wherein said microcontroller comprises a comparator and a voltage reference, wherein said microcontroller compares a background noise with a possible infrared modulated transmission by using threshold control.

13. The receiver of claim 1, wherein said microcontroller determines if a signal is noise or if it is an infrared modulated transmission and if said signal is noise said microcontroller changes a voltage reference level until said noise is suppressed.

14. The receiver of claim 1, wherein said output amplifier comprises a metal-oxide-silicon field-effect transistor.

15. The receiver of claim 1, wherein said output port emits a modulated infrared signal to a device or component to control said device or component.

16. The receiver of claim 1, wherein said power supply regulator holds power at a constant value.

17. The receiver of claim 1, wherein said noise suppression includes interference from plasma television displays and fluorescent light.

38. The receiver of claim 10, wherein said input amplifier increases the amplitude of a signal without a carrier frequency.

40. The receiver of claim 1, wherein said receiver is capable of processing an infrared signal with a carrier frequency and an infrared signal without a carrier frequency.

18. A front end of an infrared remote control receiver useful for capturing a signal and suppressing unwanted signals or interference comprising:

an optional optical magnifier;

a interference filter;

at least one pin photodiode;

an input amplifier;

a microcontroller; and

an output amplifier.

19. The front end of claim 18, wherein said optical magnifier is a lens.

20. The front end of claim 18, wherein said interference filter is a bandpass glass interference filter.

21. The front end of claim 20, wherein said bandpass glass interference filter ranges from about 950+/−

12.5 nanometers to about 950+/−

20 nanometers.

22. The front end of claim 18, wherein said at least one pin photodiode comprises a radiant sensitive area of about 7.5 square millimeters.

23. The front end of claim 18, wherein said input amplifier comprises a high impedance and an overall high gain.

24. The front end of claim 23, wherein said input amplifier amplifies signals with an infrared carrier frequency from about 20 kilohertz to about 110 kilohertz.

25. The front end of claim 18, wherein said microcontroller comprises a comparator and a voltage reference, wherein said microcontroller compares a background noise with a possible infrared modulated transmission by using threshold control.

26. The front end of claim 18, wherein said output amplifier comprises a metal-oxide-silicon field-effect transistor.

27. The front end of claim 18, wherein said unwanted signals or interference includes interference from plasma television displays and fluorescent light.

39. The front end of claim 23, wherein said input amplifier amplifies a signal without a carrier frequency.

41. The front end of claim 18, wherein said front end is capable of processing an infrared signal with a carrier frequency and an infrared signal without a carrier frequency.

28. A method of processing an infrared signal by an infrared remote controller receiver comprising the steps of:

receiving a signal;

measuring a background noise;

determining if said signal is said background noise or said infrared signal;

changing a voltage reference level if said signal is determined to be said background noise; and

repeating said steps to ensure said background noise is kept at an established limit.

29. The method of claim 28, further including the step of generating an indication of receipt of said infrared signal at an infrared activity indicator.

30. The method of claim 29, wherein the step of generating an indication of receipt of said infrared signal at an infrared activity indicator includes the step of activating at least one predetermined visual signal through at least one light source.

31. The method of claim 28, further including the step of generating an indication of status of each component connected to said receiver.

32. The method of claim 30, wherein the step of generating an indication of status of each component connected to said receiver includes the step of activating at least one predetermined visual signal through at least one light source.

33. An infrared remote control receiver circuit wherein the receiver differentiates background noise from an infrared signal and suppresses said background noise, said circuit comprising:

a series of amplifiers;

at least one microcontroller;

at least one status diode;

an activity indicator diode;

an input and output amplifier control;

wherein software within said microcontroller compares said background noise with said infrared signal; and

wherein the voltage reference level is changed if said signal is determined to be said background noise.

34. The infrared remote control receiver of claim 33, wherein said circuit generates an indication of receipt of said infrared signal at said activity indicator.

35. The infrared remote control receiver of claim 33, wherein said circuit generates an indication of receipt of said infrared signal at said activity indicator by activating at least one predetermined visual signal through at least one light source.

36. The infrared remote control receiver of claim 33, wherein said circuit generates an indication of status of each component connected to said receiver.

37. The infrared remote control receiver of claim 33, wherein said circuit generates an indication of status of each component connected to said receiver by activating at least one predetermined visual signal through at least one light source.