Infrared transmitter and receiver and method

• US 5,331,450 A
• Filed: 01/06/1992
• Issued: 07/19/1994
• Est. Priority Date: 01/06/1992
• Status: Expired due to Term

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: AST Research, Inc. (Samsung Electronics Co. Ltd.)
• Inventors: Erickson, Steven S., Heep, Jerry J.
• Primary Examiner(s): PASCAL, LESLIE C
• Application Number:
  US07/818,633
• Time in Patent Office: 925 Days
• Field of Search: 359/135-140, 359/142, 359/144, 359/146, 359/147, 359/148, 358/194.1, 340/825.5, 340/825.53, 370/77
• US Class Current: 398/92
• CPC Class Codes: G08C 19/28 using pulse code
• CPC Class Codes: H03J 9/06 using electromagnetic waves other than radio waves, e.g. light
• CPC Class Codes: H04B 1/205 with control bus for exchanging commands between units

Abstract

An infrared remote-control system and method for the simultaneous transmission of data from two or more separate hand transmitters to a single remote-control receiver is disclosed. Interference between transmitted signals is eliminated by interlacing control signals with quiescent periods during transmission. The control signals are received and validated by the receiver based on the quiescent periods.

Claims

1. An apparatus for transmitting control signals to a receiving device for operating a video system, comprising:

a control signal generator for generating a control signal having a data pattern containing multiple identical data blocks interspersed with quiescent periods, said multiple data blocks being arranged in a pattern unique for the control signal and each of the data blocks being of a predetermined length for receipt by the receiver, with each control signal further including validation information to enable signal validation by the receiver; and

,

a transmitter coupled to the control signal generator for transmitting the signal, wherein the unique pattern allows the receiving device to receive at least one data block from the transmitter without interference from signals from at least one other transmitter.

2. The apparatus of claim 1 wherein the control signal generator is a microprocessor.

3. The apparatus of claim 2 wherein the microprocessor is programmed to generate a 2ⁿ data burst of data blocks, wherein n is greater than or equal to one (1).

4. The apparatus of claim 3 wherein the number n represents a total number of transmitters used with the receiving device.

5. The apparatus of claim 2 wherein the microprocessor is programmed to generate the signal validation information represented as parity structure.

6. The apparatus of claim 1 further comprising an infrared signal generator for generating infrared signals in response to the signals generated by the control signal generator for transmission by the transmitter.

7. An apparatus for receiving control signals for operating a video system, comprising:

a signal detector for detecting the control signals sent by a plurality of signal transmitting devices; and

,

a signal decoder coupled to the signal detector for decoding and validating the control signals in a manner that identifies one signal from another, wherein each control signal has a data pattern containing multiple data blocks interspersed with quiescent periods being arranged in a pattern unique for that control signal, each of the data blocks being of a predetermined length for receipt by the receiving apparatus, and with each control signal further including validation information to enable signal validation by the receiving apparatus.

8. The apparatus of claim 7 wherein the signal decoder is a microprocessor.

9. The apparatus of claim 8 wherein the microprocessor is programed to identify the data block based on its predetermined length.

10. The apparatus of claim 9 wherein the microprocessor is further programmed to validate the control signal based on a parity structure contained within the control signal.

11. The apparatus of claim 7 further comprising a storage means coupled to the signal decoder for storing each transmitted signal after validation and before being outputted to the video system.

12. The apparatus of claim 11 wherein the storage means is an 8-bit register.

13. The apparatus of claim 7 wherein at least n number of transmitters are capable of substantially simultaneous operation with the receiving apparatus and wherein the control signal generated by each transmitter comprises at least 2ⁿ data blocks, where n is greater than or equal to one (1), in a pattern unique for that control signal thereby allowing the receiver to decode each control signal received and identify at least one data block from each transmitter.

14. The apparatus of claim 7 further comprising means for detecting infrared signals.

15. A method for allowing one signal receiver and a plurality of signal transmitters to operate a video system, comprising the steps of:

in each transmitter, generating a control signal having a data pattern containing multiple identical data blocks arranged in a pattern unique for that transmitter, each of the data blocks being a predetermined length for receipt by the receiver and wherein the control signal further includes validation information to enable signal validation by the receiver, wherein each transmitter operates on the same frequency;

transmitting the control signal from at least one transmitter to the receiver;

detecting the transmitted control signal by the receiver;

identifying, in the control signal, at least one data block based on its predetermined length;

validating the control signal based on the validation information in the control signal to determine its accuracy.

16. The method of claim 15 wherein the step of validating the control signal includes the steps of:

checking validation information for a parity structure; and

then,

matching the parity structure against the data block to determine its correctness.

17. The method of claim 15 further comprising the steps of:

storing the validated data block;

sending the stored validated data block to the video system.

18. The method of claim 15 wherein at least n number of transmitters are capable of substantially simultaneous operation with the receiver and wherein the control signal generated by each transmitter comprises at least 2ⁿ data blocks, where n is greater than or equal to one (1), in a pattern unique for that control signal thereby allowing the receiver to decode each control signal received and identify at least one data block from each transmitter.

19. The method of claim 18 wherein the uniqueness of each control signal is determined by a unique quiescent period interspersed with the data blocks.

20. The method of claim 15 wherein the control signal is infrared signals.