초록 ▼

A wireless high speed data communication system having a host radio station connected to a source of data. The host radio station transmits data to a radio repeater that is within a line of sight. The communication system may include numerous repeaters each of which is configured to communicate with

A wireless high speed data communication system having a host radio station connected to a source of data. The host radio station transmits data to a radio repeater that is within a line of sight. The communication system may include numerous repeaters each of which is configured to communicate with each other within a line of sight. The repeaters are also configured to communicate with users by a direct electrical connection and a line of sight wireless connection. The users may also be electrically connected to a local area network for further distribution of the data.

대표청구항 ▼

A wireless high speed data communication system having a host radio station connected to a source of data. The host radio station transmits data to a radio repeater that is within a line of sight. The communication system may include numerous repeaters each of which is configured to communicate with

A wireless high speed data communication system having a host radio station connected to a source of data. The host radio station transmits data to a radio repeater that is within a line of sight. The communication system may include numerous repeaters each of which is configured to communicate with each other within a line of sight. The repeaters are also configured to communicate with users by a direct electrical connection and a line of sight wireless connection. The users may also be electrically connected to a local area network for further distribution of the data. haped recording medium according to claim 7, wherein when the recording and/or reproducing unit is moved to the lifted position, the driving force from the moving gear to the second feed gear is interrupted. 9. An apparatus for recording and/or reproducing a disc-shaped recording medium according to claim 8, wherein the carrying mechanism has a movable gear which is disposed between the second feed gear and the moving gear and is moved by the recording and/or reproducing unit. 10. An apparatus for recording and/or reproducing a disc-shaped recording medium according to claim 7, wherein the at least one placement member is locked in the loading position when the recording and/or reproducing unit is moved to the lifted position. 11. An apparatus for recording and/or reproducing a disc-shaped recording medium according to claim 10, wherein the at least one placement member is locked in the loading position by the recording and/or reproducing unit when the recording and/or reproducing unit is moved to the lifted position. 12. An apparatus for recording and/or reproducing a disc-shaped recording medium according to claim 11, wherein a fitting projection is formed in one of the recording and/or reproducing unit and the at least one placement member and a part to which the fitting projection is fit is formed in the other one of the at least one placement member and the recording and/or reproducing unit. 13. An apparatus for recording and/or reproducing a disc-shaped recording medium, comprising: a plurality of placement members on each of which a disc-shaped recording medium is placed; a housing unit in which the placement members are stacked and housed; an elevating mechanism for elevating the housing unit in a direction almost parallel to a stack direction of the placement members; a recording and/or reproducing unit for recording or reproducing at least one of the disc-shaped recording mediums; a carrying mechanism for carrying one of the plurality of placement members among a position where a disc-shaped recording medium can be placed or ejected to/from the at least one placement member, a position where the at least one placement member is housed in the housing unit, and a position where the disc-shaped recording medium placed on the at least one placement member is loaded to the recording and/or reproducing unit; a driving source for driving both the carrying mechanism and the elevating mechanism; and a switching mechanism for selectively supplying a driving force from the driving source to the carrying mechanism and the elevating mechanism, wherein a rack part is formed in the at least one placement member, the carrying mechanism includes a feed gear and an arm, the feed gear comes into engagement with the rack part and is rotatably attached to the arm, and the switching mechanism swings the arm so that the feed gear is disengaged from the rack part when the elevating mechanism is driven. 14. An apparatus for recording and/or reproducing a disc-shaped recording medium according to claim 13, wherein the carrying mechanism further comprises a second feed gear for carrying the at least one placement member, the switching mechanism has a moving gear which moves between first and second positions, a driving force from the driving source is transmitted to the another feed gear when the moving gear is in the first position, and the driving force from the driving source is transmitted to the elevating mechanism when the second feed gear is in the second position. 15. An apparatus for recording and/or reproducing a disc-shaped recording medium according to claim 14, wherein the elevating mechanism has a slider for elevating the housing unit. 16. An apparatus for recording and/or reproducing a disc-shaped recording medium according to claim 15, wherein the elevating mechanism has a Geneva gear which is rotated by the moving gear and moves the slider. 17. An apparatus for recording and/or reproducing a disc-shaped recording m edium according to claim 14, further comprising a cam member, wherein the switching mechanism further includes a switching slider driven by the cam member, and the switching slider is moved by the cam member, thereby swinging the arm. 18. An apparatus for recording and/or reproducing a disc-shaped recording medium according to claim 17, wherein the switching mechanism further includes a lever, and the lever is swung when the switching slider is moved, thereby moving the moving gear to the second position. 19. An apparatus for recording and/or reproducing a disc-shaped recording medium according to claim 17, wherein the recording and/or reproducing unit is moved to a position where the disc-shaped recording medium on the at least one placement member is lifted from the at least one placement member by the cam member and a position lower than the at least one placement member. 20. An apparatus for recording and/or reproducing a disc-shaped recording medium according to claim 19, wherein when the recording and/or reproducing unit is moved to the lifting position, the driving force from the moving gear to the second feed gear is interrupted. 21. An apparatus for recording and/or reproducing a disc-shaped recording medium according to claim 20, wherein the carrying mechanism has a movable gear which is disposed between the second feed gear and the moving gear and is moved by the recording and/or reproducing unit. 22. An apparatus for recording and/or reproducing a disc-shaped recording medium according to claim 19, wherein the placement member is locked in the loading position when the recording and/or reproducing unit is moved to the lifting position. 23. An apparatus for recording and/or reproducing a disc-shaped recording medium according to claim 22, wherein the placement member is locked in the loading position by the recording and/or reproducing unit when the recording and/or reproducing unit is moved to the lifting position. 24. An apparatus for recording and/or reproducing a disc-shaped recording medium according to claim 23, wherein a fitting projection is formed in one of the recording and/or reproducing unit and the at least one placement member and a part to which the fitting projection is fit is formed in the other one of the at least one placement member and the recording and/or reproducing unit. arison data satisfy the comparison criterion relating to the relative magnitudes. 7. The packet filtering apparatus of claim 1, wherein the packet is either of an MPEG (Moving Pictures Experts Group) transport stream packet and an MPEG packetized elementary stream packet. 8. A packet filtering apparatus for selectively outputting packets out of a plurality of inputted packets, the packet filtering apparatus comprising: storage means for storing a plurality of type 2 conditions, each type 2 condition being composed of a plurality of type 1 conditions, each type 1 condition being specified by (1) a partial data position that indicates a position of a data part of a packet, (2) comparison data to which the data part is to be compared, and (3) a comparison criterion for comparing the data part and comparison data, and the type 2 conditions being composed such that the comparison criteria in the type 1 conditions differ, either between the type 1 conditions in a same type 2 condition or between the type 1 conditions in different type 2 conditions; selecting means for selecting one type 2 condition out of the stored plurality of type 2 conditions: and filtering means for comparing, by applying each type 1 condition in the selected type 2 condition one at a time, the data part of one inputted packet with the comparison data according to the comparison criterion and for selectively allowing the packet to pass only if a comparison result "true" is given for every type 1 condition in the selected type 2 condition. 9. A set-top box including a packet filtering unit for selectively outputting packets out of a plurality of inputted packets, the packet filtering unit comprising: storage means for storing a plurality of conditions, each condition being specified by (1) a partial data position that indicates a position of a data part of a packet, (2) comparison data to which the data part is to be compared, and (3) a comparison criterion for comparing the data part and comparison data, wherein different conditions include different comparison criteria; selecting means for selecting one of the stored plurality of conditions: and filtering means for comparing, based on the selected condition, the data part of one inputted packet with the comparison data according to the comparison criterion and for selecti