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A method for managing multipath signals to be demodulated by a receiver with multiple demodulators. The method includes a series of steps, including receiving the multipath signals at a wireless communication receiver device, finding the multipath signals having sufficient signal strength for demodu

A method for managing multipath signals to be demodulated by a receiver with multiple demodulators. The method includes a series of steps, including receiving the multipath signals at a wireless communication receiver device, finding the multipath signals having sufficient signal strength for demodulation, and measuring an arrival time of one of the multipath signals. In one embodiment, the present invention also recites measuring a signal-to-noise ratio (SNR) level of one of the multipath signals, updating a multipath list with the arrival time and the signal-to-noise ratio if the multipath signal is identified based upon the arrival time with one of the multipath signals existing in the multipath list, and identifying newly-found multipath signals and evaluating one of the newly-found multipath signals based on the signal-to-noise ratio for categorization into one of a plurality of states. Additionally, in one embodiment of the present invention, the present method includes evaluating one of the existing multipath signals based on the signal-to-noise ratio for moving the multipath signal from one to another of a plurality of states, selectively providing one of the multipath signals for a demodulation operation based upon its state, selectively rejecting one of the multipath signals from the multipath list based on the signal-to-noise ratio, and repeating several of the above mentioned operations to process all found multipath signals.

대표청구항 ▼

A method for managing multipath signals to be demodulated by a receiver with multiple demodulators. The method includes a series of steps, including receiving the multipath signals at a wireless communication receiver device, finding the multipath signals having sufficient signal strength for demodu

A method for managing multipath signals to be demodulated by a receiver with multiple demodulators. The method includes a series of steps, including receiving the multipath signals at a wireless communication receiver device, finding the multipath signals having sufficient signal strength for demodulation, and measuring an arrival time of one of the multipath signals. In one embodiment, the present invention also recites measuring a signal-to-noise ratio (SNR) level of one of the multipath signals, updating a multipath list with the arrival time and the signal-to-noise ratio if the multipath signal is identified based upon the arrival time with one of the multipath signals existing in the multipath list, and identifying newly-found multipath signals and evaluating one of the newly-found multipath signals based on the signal-to-noise ratio for categorization into one of a plurality of states. Additionally, in one embodiment of the present invention, the present method includes evaluating one of the existing multipath signals based on the signal-to-noise ratio for moving the multipath signal from one to another of a plurality of states, selectively providing one of the multipath signals for a demodulation operation based upon its state, selectively rejecting one of the multipath signals from the multipath list based on the signal-to-noise ratio, and repeating several of the above mentioned operations to process all found multipath signals. 9840800, Pilley, 315/241.P; US-4587463, 19860500, Allington, 315/307; US-4688099, 19870800, Funston, 348/096; US-6316882, 20011100, Choi et al., 315/225; US-6504315, 20030100, Kim, 315/224; US-20020109471, 20020800, Adams et al., 315/363 B pictures which are affected by the last picture within the previous GOP.10. The transferring apparatus of claim 1, wherein each of the stream format converter and the re-encoder has a picture buffer, such that the stream format converter and the re-encoder provide the first and second streams to the stream selector at nearly the same time when the stream selector switches from one stream to the other stream.11. The transferring apparatus of claim 1, further comprising an on screen display (OSD) bitmap image generator for converting a subpicture image read from the disc into an OSD bitmap image and providing the OSD bitmap image information and screen control information for a subpicture to the transmission channel.12. The transferring apparatus of claim 1, wherein the apparatus for receiving information is a digital television, and comprises:a demultiplexer for demultiplexing a stream received from the stream selector via the transmission channel, into a video stream and an audio stream;an audio decoder for decoding the audio stream and providing a decoded audio signal;a video decoder for decoding the video stream and providing a decoded video signal;an OSD image controller for controlling the OSD bitmap image information received via the transmission channel to be expressed on a corresponding area of a screen according to the screen control information at a predetermined time; anda graphic overlay for overlaying the decoded video signal with the OSD bitmap image information under the control of the OSD image controller.13. A method of transferring disc information to another apparatus, comprising: (a) providing a first stream by converting from a program stream format of audio and video information read from a disc into a transport stream format;(b) providing a second stream by overlaying video information read from the disc with subpicture information read from the disc and re-encoding the overlaid information using a predetermined compression encoding scheme for image information; and(c) selecting either the first or second stream according to the requirements of a user, the bandwidth of a transmission channel, and the information processing capability of an apparatus for receiving information, and transferring a selected stream to the apparatus for receiving information via a transmission channel.14. The transferring method of claim 13, wherein the predetermined compression encoding scheme for image information is moving picture experts group (MPEG)-2 full re-encoding, MPEG-2 intra picture re-encoding, or digital video format re-encoding.15. The transferring method of claim 13, wherein the transfer standard of the transmission channel is an IEEE 1394 interface or an 8 vestigial side band (8-VSB).16. The transferring method of claim 13, wherein the disc is a digital versatile disc (DVD).17. The transferring method of claim 16, wherein the stream selection and the predetermined compression encoding scheme for image information are previously determined by a negotiation between a DVD apparatus for transferring the DVD information and an apparatus for receiving the DVD information.18. The transferring method of claim 13, wherein in the step (c), the stream selector selects the second stream only when a user wants a subpicture to be displayed, and selects the first stream in the other cases.19. The transferring method of claim 13, wherein in the step (c), either the first or second stream is selected in units of at least one frame information according to a received stream switching control command.20. The transferring method of claim 19, wherein in the step (c), when the stream switching control command for switching from the first stream to the second stream or from the second stream to the first stream is received, a continuous, uninterrupted image is provided by performing switch ing after a group of P, B and B pictures of the first stream in consideration of the order of pictures.21. The transferring method of claim 19, wherein in the step (c), when the second stream is overlaid by a subpicture and the stream switching control command for switching from the second stream to the first stream is received, switching is performed only when a new group of picture (GOP) starts, and when a new GOP of the first stream starts with bidirectionally predictive (B) pictures which are affected by the last picture within a previous GOP of the second stream, intra pictures of the second stream are further transferred, and then in a new GOP, the first stream is transferred with the exception of the B pictures which are affected by the last picture within the previous GOP.22. The transferring method of claim 13, further comprising (d) converting a subpicture image read from the disc into an OSD bitmap image, and transferring the OSD bitmap image to the transmission channel.