摘要:
A method of reproducing data from an optical disk having a diameter less than 140mm, a thickness of 1,2mm and a recording area divided into a lead-in area, and a program area, and wherein said data is recorded as pits representing modulated, error-correction encoded user information in sectors in user tracks in said program area and representing modulated, error-correcting encoded control information in sectors in one of said lead-in area or said program area, with said control information including addresses of respective user tracks, the tracks having a track pitch in the range of 0.646µm to 1.05µm, said method comprising the steps of rotating said disk to obtain a constant linear velocity; projecting a pickup light beam through a lens for optically reading the rotating disk, said pickup light beam having a spatial frequency I=λ/2NA, where the spatial frequency I is less than the track pitch, λ is the wavelength of the pickup light beam and NA is the numerical aperture of the lens; demodulating the data read from said disk; error correcting the demodulated data; separating the error corrected data into control information and user information; and using said control information to access and read selected user tracks in response to access instructions from a user.
摘要:
A method of reproducing data from an optical disk having a diameter less than 140mm, a thickness of 1,2mm and a recording area divided into a lead-in area, and a program area, and wherein said data is recorded as pits representing modulated, error-correction encoded user information in sectors in user tracks in said program area and representing modulated, error-correcting encoded control information in sectors in one of said lead-in area or said program area, with said control information including addresses of respective user tracks, the tracks having a track pitch in the range of 0.646µm to 1.05µm, said method comprising the steps of rotating said disk to obtain a constant linear velocity;
projecting a pickup light beam through a lens for optically reading the rotating disk, said pickup light beam having a spatial frequency I=λ/2NA, where the spatial frequency I is less than the track pitch, λ is the wavelength of the pickup light beam and NA is the numerical aperture of the lens; demodulating the data read from said disk; error correcting the demodulated data; separating the error corrected data into control information and user information; and using said control information to access and read selected user tracks in response to access instructions from a user.
摘要:
GUI presentation in a home network is improved by using a video encoding tailored for GUI, while using normal video encoding for video presentation. Also, GUI command response time is shortened by reserving, for transmission of commands originated by a user input device (12), a time slot in a contention free period (CFP) of a transmission cycle between a client device (14) receiving the commands and a server (2) executing them.
摘要:
A method and apparatus for communicating streaming data, such as audio and video streams, isochronously over a network. The invention may be utilized with power-line communication (50) networks or other IP-based networks. Hardware (82) is configured for packetizing the streaming data, such as MPEG streaming data, which is communicated at the IP physical layer within a contention-free period within each communication cycle (32a and 32b). A reservation mechanism utilizes back-offs to allow a single transmitter to reserve a slot for isochronous communication of a given stream of data. A processing element handles packetizing only for asynchronous communication of data within the remaining portion of each communication cycle which is referred to as a contention period (34), as a number of transmitters may vie for communication during that interval. Addressing for the isochronous communication is performed with MAC addressing instead of IP addressing. Existing IP stack and protocols can be reused for upper layer control mechanisms.
摘要:
A method and apparatus for communicating streaming data, such as audio and video streams, isochronously over a network. The invention may be utilized with power-line communication (50) networks or other IP-based networks. Hardware (82) is configured for packetizing the streaming data, such as MPEG streaming data, which is communicated at the IP physical layer within a contention-free period within each communication cycle (32a and 32b). A reservation mechanism utilizes back-offs to allow a single transmitter to reserve a slot for isochronous communication of a given stream of data. A processing element handles packetizing only for asynchronous communication of data within the remaining portion of each communication cycle which is referred to as a contention period (34), as a number of transmitters may vie for communication during that interval. Addressing for the isochronous communication is performed with MAC addressing instead of IP addressing. Existing IP stack and protocols can be reused for upper layer control mechanisms.