Economical extension of the operating distance of an RF remote link accommodating information signals having differing carrier frequencies
View Patent ↗A system for economically extending the effective operational range of an infrared remote control system having a remote control unit with an infrared transmitter, and a controlled device having an infrared receiver. The system includes a first transmitter to receive IR signals from the remote control unit and transmit an RF output signal corresponding to the infrared signal received from the remote control unit. The RF signal is received by an RF receiver which generates a second IR signal corresponding to the received radio signal. The second IR signal is transmitted to and received by the IR controlled device. In some cases, the first IR control signal, and in all cases, the RF, signal include information/data concerning the IR carrier frequency. This information/data of IR carrier frequency, instead of the RF transmission of the actual IR carrier frequency, permits a reduction of the RF bandwidth since the full frequency spectrum of possible IR carriers need not be transmitted, thus permitting amplitude shift keying (ASK) modulation to be used. The RF receiver decodes the received signal and uses the information/data to configure a second IR control signal that is compatible with and transmitted to the controlled device.
1. An RF transmission system comprising:
an RF transmitter having a first carrier at a first carrier frequency which is modulatable by an information containing signal having a second carrier at a second carrier frequency;
means for deleting the second carrier and substituting data identifying the second carrier frequency in place of the actual carrier for transmission, and
an RF receiver for receiving the RF transmission, the RF receiver including means for reconstructing the information containing signal including the designated carrier frequency by using the substituted data.
2. An RF transmission system comprising:
an RF transmitter having a first carrier at a first carrier frequency which is modulatable by an information containing signal having a second carrier at a second carrier frequency;
means for deleting the second carrier and substituting data identifying the second carrier frequency in place of the actual carrier for transmission, and
an RF receiver for receiving the RF transmission, the RF receiver including means for reconstructing the information containing signal including the designated carrier frequency by using the substituted data,
the RF carrier is ASK modulated by the information containing signal with substitute data.
3. An RF transmission apparatus comprising:
an RF transmitter having a first carrier at a first carrier frequency which is modulatable by an information containing signal having a second carrier at a second carrier frequency; and
means for deleting the second carrier and substituting data identifying the second carrier frequency in place of the actual carrier for transmission.