Radio signal broadcast system and method
View Patent ↗A first transmitting device is used to transmit a first signal on a first carrier frequency to a relay device. The relay device receives the signal by demodulating the first carrier frequency. Subsequently, the relay device retransmits the signal by modulating a second and/or a third carrier frequency. The signal is then recovered at one or more receiving devices by demodulating the second and/or third carrier frequencies. Further, a second transmitting device transmits a second signal on a fourth carrier frequency and the relay device retransmits the signal by modulating a fifth and/or a sixth carrier frequency. The signal is then recovered at one or more receiving devices by demodulating the fifth and/or sixth carrier frequencies. The transmitting and/or receiving devices are preferably voice terminals, such as a wireless telephones or data terminals, such as portable computers. The transmitting and/or receiving devices are optionally coupled to a communications network, such as a public switched telephone network or the Internet. The relay device is preferably a multiple beam satellite and/or a ground station covering several distinct geographical regions.
1. A system for broadcasting a netted radio signal,
comprising:
a first transmitting device for transmitting a first signal on a first carrier frequency;
a relay device for receiving the first signal on the first carrier frequency and transmitting the first signal on second and third carrier frequencies;
at least a first receiving device which receives the first signal on the second carrier frequency after the first receiving device registers with the system as an authorized receiving device for the first signal; and,
at least a receiving device which receives the first signal on the third carrier frequency after the second receiving device registers with the system as another authorized receiving device for the first signal; and
further comprising:
a second transmitting device for transmitting a second signal on a fourth carrier frequency;
at least a third receiving device for receiving the second signal on a fifth carrier frequency; and
at least a fourth receiving device for receiving the second signal on the sixth carrier frequency, wherein the relay device for receives the second signal on the fourth carrier frequency and transmits the second signal on the fifth and sixth carrier frequencies.
2. A system as defined in claim 1 , wherein the second carrier frequency is normally used for a point-to-point voice channel.
3. A system as defined in claim 2 , wherein a control channel is used for the point-to-point channel, and the control channel is used for the netted radio signal.
4. A system as defined in claim 1 , wherein the first signal comprises a digital voice signal.
5. A system as defined in claim 1 , wherein the first transmitting device comprises at least one of (a) a voice terminal, (b) a data terminal, (c) a time division multiple access communication device, (d) a code division multiple access communication device, and (e) a frequency-division multiple access communication device.
6. A system as defined in claim 1 , wherein the first transmitting device is coupled to a communications network.
7. A system as defined in claim 1 , wherein the first carrier frequency comprises at least one of (a) an L-band frequency, (b) an S-band frequency, (c) a C-band frequency, (d) a Ku-band frequency, and (e) a Ka-band frequency.
8. A system as defined in claim 1 , wherein the relay device comprises a multiple beam geosynchronous communications satellite.
9. A system as defined in claim 1 , wherein the relay device comprises a ground station.
10. A system as defined in claim 1 , wherein the relay device comprises at least one of (a) a time division multiple access communication device, (b) a code division multiple access communication device, and (c) a frequency-division multiple access communication device.
11. A system as defined in claim 1 , wherein a second carrier frequency comprises at least one of (a) an L-band frequency, (b) an S-band frequency, (c) a C-band frequency, (d) a Ku-band frequency, and (e) a Ka-band frequency.
12. A system as defined in claim 1 , wherein the first and second receiving device comprises at least one of (a) voice terminals, (b) data terminals, (c) time division multiple access communication devices, (d) code division multiple access communication devices, and (e) frequency-division multiple access communication devices.
13. A system as defined in claim 1 , wherein the first receiving device is coupled to a communications network.