IPC분류정보
국가/구분 |
United States(US) Patent
등록
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국제특허분류(IPC7판) |
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출원번호 |
US-0298315
(1999-04-23)
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발명자
/ 주소 |
- Abdelgany, MohyEldeen Fouad
- Laub, Dana Vincent
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출원인 / 주소 |
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대리인 / 주소 |
Thomas, Kayden, Horstemeyer & Risley, L.L.P.
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인용정보 |
피인용 횟수 :
30 인용 특허 :
8 |
초록
▼
A communication system for communicating CDMA and GSM transmit and receive RF information signals through one or more antennas is disclosed. The communication system is comprised of a transmitting unit, a receiving unit, and at least one antenna. The transmitting unit modulates and upconverts a tran
A communication system for communicating CDMA and GSM transmit and receive RF information signals through one or more antennas is disclosed. The communication system is comprised of a transmitting unit, a receiving unit, and at least one antenna. The transmitting unit modulates and upconverts a transmit baseband information signal to generate a CDMA transmit RF information signal and a GSM transmit RF information signal. The receiving unit downconverts and demodulates a CDMA receive RF information signal and a GSM receive RF information signal to generate a receive baseband information signal. One or more antennas are coupled to the transmitting unit and receiving unit for transmitting the CDMA transmit RF information signal and the GSM transmit RF information signal, and receiving the CDMA receive RF information signal and the GSM receive RF information signal. The transmitting unit comprises a modulator for modulating a transmit IF LO frequency with the transmit baseband information signal to generate a transmit IF information signal. It also includes a plurality of upconverters for upconverting the transmit IF information signal with a GSM transmit RF LO frequency to generate a GSM transmit RF information signal, and for upconverting the transmit IF information signal with a CDMA transmit RF LO frequency to generate at least one CDMA transmit RF information signal. The receiving unit comprises a downconverter for downconverting a CDMA receive RF information signal with a receive RF LO frequency to generate a receive IF information signal, and for downconverting at least one GSM receive RF information signal with the receive RF LO frequency to generate a receive IF information signal. It also includes a demodulator for demodulating the receive IF information signal with a receive IF LO frequency to generate a receive baseband information signal.
대표청구항
▼
A communication system for communicating CDMA and GSM transmit and receive RF information signals through one or more antennas is disclosed. The communication system is comprised of a transmitting unit, a receiving unit, and at least one antenna. The transmitting unit modulates and upconverts a tran
A communication system for communicating CDMA and GSM transmit and receive RF information signals through one or more antennas is disclosed. The communication system is comprised of a transmitting unit, a receiving unit, and at least one antenna. The transmitting unit modulates and upconverts a transmit baseband information signal to generate a CDMA transmit RF information signal and a GSM transmit RF information signal. The receiving unit downconverts and demodulates a CDMA receive RF information signal and a GSM receive RF information signal to generate a receive baseband information signal. One or more antennas are coupled to the transmitting unit and receiving unit for transmitting the CDMA transmit RF information signal and the GSM transmit RF information signal, and receiving the CDMA receive RF information signal and the GSM receive RF information signal. The transmitting unit comprises a modulator for modulating a transmit IF LO frequency with the transmit baseband information signal to generate a transmit IF information signal. It also includes a plurality of upconverters for upconverting the transmit IF information signal with a GSM transmit RF LO frequency to generate a GSM transmit RF information signal, and for upconverting the transmit IF information signal with a CDMA transmit RF LO frequency to generate at least one CDMA transmit RF information signal. The receiving unit comprises a downconverter for downconverting a CDMA receive RF information signal with a receive RF LO frequency to generate a receive IF information signal, and for downconverting at least one GSM receive RF information signal with the receive RF LO frequency to generate a receive IF information signal. It also includes a demodulator for demodulating the receive IF information signal with a receive IF LO frequency to generate a receive baseband information signal. o uncompressed video signals; making the uncompressed video signals available on a bus; selecting uncompressed video signals from the bus; and encoding the selected uncompressed video signals for transmission to respective terminals. 2. The method of claim 1 wherein the decoding and encoding include using different compression algorithms matching compression algorithms of respective terminals. 3. The method of claim 1 wherein the decoding and encoding further include operating at data rates matching respective terminals such that terminals having different data rates can intercommunicate in the conference. 4. The method of claim 1 wherein the encoding further includes encoding selected uncompressed video signals to form composite encoded video signals. 5. A method of operating a conference, comprising: receiving first compressed video frames from a first audiovisual terminal at a first data transmission rate; receiving second compressed video frames from a second audiovisual terminal at a second data transmission rate, the second data transmission rate being slower than the first data transmission rate; decompressing the first compressed video frames and thereby generating first decompressed video frames; decompressing the second compressed video frames and thereby generating second decompressed video frames; outputting the first decompressed video frames to a bus during a first plurality of timeslots; outputting the second decompressed video frames to the bus during a second plurality of timeslots, the second plurality of timeslots being interleaved with the first plurality of timeslots; reading at least some decompressed video frames from the bus during the first plurality of timeslots; reading at least some decompressed video frames from the bus during the second plurality of timeslots; using at least some of the decompressed video frames read from the bus during the first and second pluralities of timeslots to form third decompressed video frames, each frame in the third decompressed video frames being representative of a composite image; compressing the third decompressed video frames and thereby generating third compressed video frames; and sending the third compressed video frames to a third audiovisual terminal at a third data transmission rate. 6. A method according to claim 5, wherein the third data transmission rate is substantially equal to the first data transmission rate. 7. A method according to claim 5, wherein the third data transmission rate is substantially equal to the second data transmission rate. 8. A method according to claim 5, wherein at least one of the second decompressed video frames is used to generate more than one of the third decompressed video frames. 9. A method according to claim 5, wherein at least one of the first decompressed video frames is not used to generate any of the third decompressed video frames. 10. A method according to claim 5, wherein outputting the first decompressed video frames to a bus comprises outputting the first decompressed video frames to the bus at a first frame rate. 11. A method according to claim 10, wherein outputting the second decompressed video frames to the bus comprises outputting the second decompressed video frames to the bus at the first frame rate. 12. A method according to claim 11, wherein outputting the second decompressed video frames to the bus at the first frame rate comprises outputting at least one of the second decompressed video frames to the bus more than once. 13. A method according to claim 11, wherein reading at least some decompressed video frames from the bus during the first plurality of timeslots comprises reading decompressed video frames from the bus at the first frame rate. 14. A method according to claim 13, wherein reading at least some decompressed video frames from the bus during the second plurality of timeslots comprises reading decompressed video frames from the bus at the first frame rate. 15. A method a ccording to claim 5, further comprising compressing at least some of the decompressed video frames read from the bus during the first plurality of timeslots and sending those compressed video frames to the second terminal at the second data transmission rate. 16. A method according to claim 15, further comprising compressing at least some of the decompressed video frames read from the bus during the second plurality of timeslots and sending those compressed video frames to the first terminal at the first data transmission rate. 17. A method according to claim 16, wherein at least some of the first decompressed video frames are not compressed and are not to the second terminal. 18. A method according to claim 17, wherein outputting the second decompressed video frames to the bus comprises outputting at least one of the second decompressed video frames to the bus more than once. 19. A method of operating a conference, comprising: receiving first compressed video frames from a first audiovisual terminal at a first data transmission rate; receiving second compressed video frames from a second audiovisual terminal at a second data transmission rate, the second data transmission rate being slower than the first data transmission rate; decompressing the first compressed video frames and thereby generating first decompressed video frames; decompressing the second compressed video frames and thereby generating second decompressed video frames; outputting the first decompressed video frames to a bus during a first plurality of timeslots; outputting the second decompressed video frames to the bus during a second plurality of timeslots, the second plurality of timeslots being interleaved with the first plurality of timeslots; reading at least some decompressed video frames from the bus during the first plurality of timeslots; reading at least some decompressed video frames from the bus during the second plurality of timeslots; compressing at least some of the decompressed video frames read from the bus during the first plurality of timeslots and sending those compressed video frames to the second terminal at the second data transmission rate; and compressing at least some of the decompressed video frames read from the bus during the second plurality of timeslots and sending those compressed video frames to the first terminal at the first data transmission rate. 20. A method according to claim 19, wherein at least some of the first decompressed video frames are not compressed and are not to the second terminal. 21. A method according to claim 20, wherein outputting the second decompressed video frames to the bus comprises outputting at least one of the second decompressed video frames to the bus more than once. 22. A method according to claim 19, further comprising: using at least some of the decompressed video frames read from the bus during the first and second pluralities of timeslots to form third decompressed video frames, each frame in the third decompressed video frames being representative of a composite image; compressing the third decompressed video frames and thereby generating third compressed video frames; and sending the third compressed video frames to a third audiovisual terminal at a third data transmission rate. 23. A method according to claim 22, wherein the third data transmission rate is substantially equal to the first data transmission rate. 24. A method according to claim 22, wherein the third data transmission rate is substantially equal to the second data transmission rate. 25. A method according to claim 22, wherein at least one of the second decompressed video frames is used to generate more than one of the third decompressed video frames. 26. A method according to claim 22, wherein at least one of the first decompressed video frames is not used to generate any of the third decompressed video frames. 27. A method according to claim 22, wherein outputting the first decompressed video frames t o a bus comprises outputting the first decompressed video frames to the bus at a first frame rate. 28. A method according to claim 27, wherein outputting the second decompressed video frames to the bus comprises outputting the second decompressed video frames to the bus at the first frame rate. 29. A method according to claim 28, wherein outputting the second decompressed video frames to the bus at the first frame rate comprises outputting at least one of the second decompressed video frames to the bus more than once. 30. A method according to claim 28, wherein reading at least some decompressed video frames from the bus during the first plurality of timeslots comprises reading decompressed video frames from the bus at the first frame rate. 31. A method according to claim 30, wherein reading at least some decompressed video frames from the bus during the second plurality of timeslots comprises reading decompressed video frames from the bus at the first frame rate. 32. A method according to claim 19, wherein the first compressed video frames have been compressed according to a first data compression algorithm and wherein the second compressed video frames have been compressed according to a second data compression algorithm. 33. A method according to claim 32, wherein decompressing the first compressed video frames comprises decompressing the first compressed video frames according to the first data compression algorithm. 34. A method according to claim 33, wherein decompressing the second compressed video frames comprises decompressing the second compressed video frames according to the second data compression algorithm. 35. A method of operating a conference, comprising: receiving first compressed video frames from a first audiovisual terminal at a first data transmission rate; receiving second compressed video frames from a second audiovisual terminal at a second data transmission rate; decompressing the first compressed video frames and thereby generating first decompressed video frames; decompressing the second compressed video frames and thereby generating second decompressed video frames; outputting the first decompressed video frames to a bus during a first plurality of timeslots; outputting the second decompressed video frames to the bus during a second plurality of timeslots, the second plurality of timeslots being interleaved with the first plurality of timeslots; reading at least some decompressed video frames from the bus during the first plurality of timeslots; reading at least some decompressed video frames from the bus during the second plurality of timeslots; using at least some of the decompressed video frames read from the bus during the first and second pluralities of timeslots to form third decompressed video frames, each frame in the third decompressed video frames being representative of a composite image; compressing the third decompressed video frames and thereby generating third compressed video frames; and sending the third compressed video frames to a third audiovisual terminal at a third data transmission rate. 36. A method according to claim 35, wherein the first data transmission rate is substantially equal to the second data transmission rate and to the third data transmission rate. 37. A method according to claim 35, wherein the second data transmission rate is slower than the first data transmission rate. 38. A method according to claim 37, wherein the third data transmission rate is substantially equal to the first data transmission rate. 39. A method according to claim 37, wherein the third data transmission rate is substantially equal to the second data transmission rate. 40. A method according to claim 37, wherein at least one of the second decompressed video frames is used to generate more than one of the third decompressed video frames. 41. A method according to claim 37, wherein at least one of the first decompressed video frames is not used to generate any of the third de compressed video frames. 42. A method according to claim 37, wherein outputting the first decompressed video frames to a bus comprises outputting the first decompressed video frames to the bus at a first frame rate. 43. A method according to claim 42, wherein outputting the second decompressed video frames to the bus comprises outputting the second decompressed video frames to the bus at the first frame rate. 44. A method according to claim 43, wherein outputting the second decompressed video frames to the bus at the first frame rate comprises outputting at least one of the second decompressed video frames to the bus more than once. 45. A method according to claim 43, wherein reading at least some decompressed video frames from the bus during the first plurality of timeslots comprises reading decompressed video frames from the bus at the first frame rate. 46. A method according to claim 45, wherein reading at least some decompressed video frames from the bus during the second plurality of timeslots comprises reading decompressed video frames from the bus at the first frame rate. 47. A method according to claim 37, further comprising compressing at least some of the decompressed video frames read from the bus during the first plurality of timeslots and sending those compressed video frames to the second terminal at the second data transmission rate. 48. A method according to claim 47, further comprising compressing at least some of the decompressed video frames read from the bus during the second plurality of timeslots and sending those compressed video frames to the first terminal at the first data transmission rate. 49. A method according to claim 48, wherein at least some of the first decompressed video frames are not compressed and are not to the second terminal. 50. A method according to claim 49, wherein outputting the second decompressed video frames to the bus comprises outputting at least one of the second decompressed video frames to the bus more than once. 51. A method of operating a conference, comprising: receiving first compressed video frames from a first audiovisual terminal at a first data transmission rate, the first compressed video frames having been compressed according to a first data compression algorithm; receiving second compressed video frames from a second audiovisual terminal at a second data transmission rate, the second compressed video frames having been compressed according to a second data compression algorithm; decompressing the first compressed video frames according to the first data compression algorithm and thereby generating first decompressed video frames; decompressing the second compressed video frames according to the second data compression algorithm and thereby generating second decompressed video frames; outputting the first decompressed video frames to a bus during a first plurality of timeslots; outputting the second decompressed video frames to the bus during a second plurality of timeslots, the second plurality of timeslots being interleaved with the first plurality of timeslots; reading at least some decompressed video frames from the bus during the first plurality of timeslots; reading at least some decompressed video frames from the bus during the second plurality of timeslots; compressing at least some of the decompressed video frames read from the bus during the first plurality of timeslots according to the second data compression algorithm and sending those compressed video frames to the second terminal at the second data transmission rate; and compressing at least some of the decompressed video frames read from the bus during the second plurality of timeslots according to the first data compression algorithm and sending those compressed video frames to the first terminal at the first data transmission rate. 52. A method according to claim 51, wherein the first data transmission rate is substantially equal to the second data transmission rate. 53. A method ac
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