Method and apparatus for transmission of command combinations by means of coded frequency-shift keying
View Patent ↗A method is disclosed for transmission of commands or command combinations via a communication link by coded frequency-shift keying. Each command or command combination is associated with one frequency pair. When a command changes from a preceding command or command combination to a subsequent command or command combination, one frequency (which will be the first to be transmitted) in the frequency pair of the subsequent command or command combination is chosen as a function of at least one other associated frequency pair.
1. An apparatus for transmission of commands or command combinations via a communication link by coded frequency-shift keying, comprising:
means for changing a preceding command or command combination associated with a first frequency pair to a subsequent command or command combination associated with a second frequency pair, and for choosing the frequency which will be first transmitted in the second frequency pair of the subsequent command or command combination as a function of at least one other associated frequency pair.
2. The apparatus as claimed in claim 1 , wherein each command or the command combination is a protection command that is transmitted over an electrical power line.
3. The apparatus as claimed in claim 1 , wherein the frequencies of each command or of each command combination are in a limited frequency band.
4. The apparatus as claimed in claim 3 , wherein the limited frequency band has a bandwidth of 4 kHz.
5. The apparatus as claimed in claim 1 , comprising:
means for inserting an insert frequency and/or a pause on changing from the preceding command or command combination to the subsequent command or command combination.
6. The apparatus as claimed in claim 1 , configured to choose the first frequency to be transmitted as a function of the first frequency pair of the preceding command or command combination.
7. The apparatus as claimed in claim 6 , wherein each command or the command combination is a protection command that is transmitted over an electrical power line.
8. The apparatus as claimed in claim 6 , wherein the frequencies of each command or of each command combination are in a limited frequency band.
9. The apparatus as claimed in claim 8 , wherein the limited frequency band has a bandwidth of 4 kHz.
10. The apparatus as claimed in claim 6 , comprising:
inserting an insert frequency and/or a pause on changing from the preceding command or command combination to the subsequent command or command combination.
11. A computer program product comprising computer program code means for implementing the computer readable steps of:
controlling one or more processors of an apparatus for transmission of commands or command combinations via a communication link by coded frequency-shift keying, each command or a command combination is associated with a frequency pair, in such a manner that the apparatus chooses, when a preceding command or command combination changes to a subsequent command or command combination, the first frequency to be transmitted in the frequency pair of the subsequent command or command combination as a function of at least one other associated frequency pair.
12. The computer program product as claimed in claim 11 , wherein the computer program code means implements the computer readable step of controlling the processors in such a manner that the apparatus chooses the said first frequency to be transmitted as a function of the frequency pair of the preceding command or command combination.
13. The computer program product as claimed in claim 11 , wherein each command or the command combination is a protection command that is transmitted over an electrical power line.
14. The computer program product as claimed in claim 11 , wherein the frequencies of each command or of each command combination are in a limited frequency band.
15. The computer program product as claimed in claim 14 , wherein the limited frequency band has a bandwidth of 4 kHz.
16. The computer program product as claimed in claim 11 , comprising:
inserting an insert frequency and/or a pause on changing from the preceding command or command combination to the subsequent command or command combination.
17. The computer program product as claimed in claim 12 , wherein each command or the command combination is a protection command that is transmitted over an electrical power line.
18. The computer program product as claimed in claim 12 , wherein the frequencies of each command or of each command combination are in a limited frequency band.
19. The computer program product as claimed in claim 18 , wherein the limited frequency band has a bandwidth of 4 kHz.
20. The computer program product as claimed in claim 12 , comprising:
inserting an insert frequency and/or a pause on changing from the preceding command or command combination to the subsequent command or command combination.