Sending and receiving information

Abstract

The present invention relates to a method in a sending device for sending information to a receiving device. The sending device is adapted to emit electromagnetic radiation with different wavelengths. The method comprises sending electromagnetic radiation of a norm wavelength to the receiving device and sending electromagnetic radiation of a second wavelength to the receiving device. The difference between the first wavelength and the second wavelength per time unit represents information to be sent to the receiving device. The present invention also relates to a computer program for performing a method of sending information, a sending device, a method for receiving information, a receiving device and a computer program for performing a method of receiving information.

1 - 28 . (canceled) 
     
     
         29 . A method comprising:
 converting, by a device, information into a sequence of differences per time unit (Δλ/t) between a norm wavelength (λ) and a second wavelength (λ+Δλ);   transmitting, by the device, visible light of the norm wavelength (λ), where an initially transmitted norm wavelength (λ) of the visible light comprises an arbitrary wavelength; and   transmitting, by the device, visible light of the second wavelength (λ+Δλ), where the per time unit (Δλ/t) between the norm wavelength (λ) and the second wavelength (λ+Δλ) corresponds to the converted information.   
     
     
         30 . The method of  claim 29 , further comprising:
 transmitting, prior to transmitting the visible light of the norm wavelength (λ), light comprising a particular color, where the light comprising the particular color is transmitted for a predetermined amount of time to indicate a start of the transmission of the visible light of the norm wavelength (λ) to a receiving device.   
     
     
         31 . The method of  claim 29 , further comprising:
 setting the norm wavelength (λ) to the second wavelength (λ+Δλ), and   repeating the transmitting and the setting to transmit the converted information to a receiving device.   
     
     
         32 . The method of  claim 29 , where transmitting the visible light of the norm wavelength (λ) comprises:
 transmitting, via a plurality of channels, the visible light using a corresponding plurality of norm wavelengths (λ). 
 
     
     
         33 . The method of  claim 32 , where transmitting the visible light of the second wavelength (λ+Δλ) comprises:
 transmitting, via the plurality of channels, the visible light using a plurality of second wavelengths (λ+Δλ), where, for each of the plurality of channels, the per time unit (Δλ/t) between the norm wavelength (λ) and the second wavelength (λ+Δλ) corresponds to at least a portion of the converted information. 
 
     
     
         34 . The method of  claim 32 , where transmitting the visible light of the second wavelength (λ+Δλ) comprises:
 transmitting, via the plurality of channels, the visible light using a plurality of second wavelengths (λ+Δλ), where, for each of the plurality of channels, the per time unit (Δλ/t) between the norm wavelength (λ) and the second wavelength (λ+Δλ) corresponds to the converted information. 
 
     
     
         35 . The method of  claim 29 , where the visible light of the norm wavelength (λ) and the visible light of the second wavelength (λ+Δλ) are transmitted via a hot spot of a display unit of the device. 
     
     
         36 . A non-transitory computer-readable medium for storing instructions, the computer-readable medium comprising:
 one or more instructions to receive visible light of a norm wavelength (λ);   one or more instructions to receive visible light of a second wavelength (λ+Δλ), where the difference per time unit (λ+Δλ) between the norm wavelength (λ) and the second wavelength (λ+Δλ ) corresponds to transmitted information; and   one or more instructions to convert the received differences per time unit (Δλ/t) between the norm wavelength (λ) and the second wavelength (λ+Δλ) into the transmitted information.   
     
     
         37 . The computer-readable medium of  claim 36 , further comprising:
 one or more instructions to display the transmitted information.   
     
     
         38 . The computer-readable medium of  claim 36 , where the one or more instructions to receive the visible light of the norm wavelength (λ) and the visible light second wavelength (λ+Δλ ) include:
 one or more instructions to sample the visible light of the norm wavelength (λ) and the visible light second wavelength (λ+Δλ) at a frequency that is at least twice a frequency associated with a transmission of the visible light of the norm wavelength (λ) and the visible light second wavelength (λ+Δλ). 
 
     
     
         39 . The computer-readable medium of  claim 36 , where the one or more instructions to receive the visible light of the norm wavelength (λ) and the visible light second wavelength (λ+Δλ) include:
 one or more instructions to sample the visible light of the norm wavelength (λ) and the visible light second wavelength (λ+Δλ) at a frequency that is three times greater than a frequency associated with a transmission of the visible light of the norm wavelength (λ) and the visible light second wavelength (λ+Δλ). 
 
     
     
         40 . The computer-readable medium of  claim 36 , further comprising:
 one or more instructions to receive a transmitted marker; and   one or more instructions to identify, based on receiving the transmitted marker, a start of a transmission of the transmitted information.   
     
     
         41 . The computer-readable medium of  claim 40 , further comprising:
 one or more instructions to receive another transmitted marker; and   one or more instructions to identify, based on receiving the other transmitted marker, another transmission of the transmitted information.   
     
     
         42 . The computer-readable medium of  claim 40 , further comprising:
 one or more instructions to receive another transmitted marker; and   one or more instructions to identify, based on receiving the other transmitted marker, an end of a transmission of the transmitted information.   
     
     
         43 . A system comprising:
 a first device to:
 convert data into a sequence of differences per time unit (Δλ/t) between a norm wavelength (λ) and a second wavelength (λ+Δλ), 
 transmit, to a second device, visible light of the norm wavelength (λ), where an initially transmitted norm wavelength (λ) of the visible light comprises an arbitrary wavelength, and 
 transmit, to the second device, visible light of the second wavelength (λ+Δλ), where the per time unit (Δλ/t) between the norm wavelength (λ) and the second wavelength (λ+Δλ) corresponds to the converted data. 
   
     
     
         44 . The system of  claim 43 , where the first device is further to:
 transmit, prior to transmitting the visible light of the norm wavelength (λ), light comprising a particular color to the second device, where the light comprising the particular color is transmitted for a predetermined amount of time to indicate a start of the transmission of the visible light of the norm wavelength (λ) to the second device.   
     
     
         45 . The system of  claim 43 , where the first device is further to:
 re-define the norm wavelength (λ) to comprise the second wavelength (λ+Δλ), and   repeat the transmitting and the setting to transmit the converted data to the second device.   
     
     
         46 . The system of  claim 43 , where, when transmitting the visible light of the norm wavelength (λ), the first device is to:
 transmit, via a plurality of channels, the visible light using a corresponding plurality of norm wavelengths (λ). 
 
     
     
         47 . The system of  claim 46 , where, when transmitting the visible light of the second wavelength (λ+Δλ), the first device is to:
 transmit, via the plurality of channels, the visible light using a plurality of second wavelengths (λ+Δλ), where, for each of the plurality of channels, the per time unit (Δλ/t) between the norm wavelength (λ) and the second wavelength (λ+Δλ) corresponds to at least a portion of the converted information. 
 
     
     
         48 . The system of  claim 46 , where, when transmitting the visible light of the second wavelength (λ+Δλ), the first device is to:
 transmit, via the plurality of channels, the visible light using a plurality of second wavelengths (λ+Δλ), where, for each of the plurality of channels, the per time unit (Δλ/t) between the norm wavelength (λ) and the second wavelength (λ+Δλ) corresponds to the converted information.