Yitzhak Birk

55109055, Apr 23, 1996

Sep 28, 1993

8/128418

Yitzhak Birk - Palo Alto CA

H04N 576

358342

A track-pairing technique for use in recording and retrieving video data by alternating between a pair of tracks when recording and retrieving data segments of a data stream, a video server or recording disk is able to take advantage of zone bit recording when recording, yet data transfer rate upon retrieval is independent of track location. As a result, guaranteed throughput is substantially improved and the number of data streams which can be simultaneously sourced increases. The track-pairing technique can be embodied in a video server, a recording disk, a data layout method, or a data retrieval method.

51577658, Oct 20, 1992

Jan 3, 1992

7/818406

Yitzhak Birk - Palo Alto CA
James M. McCrossin - San Jose CA

International Business Machines Corporation - Armonk NY

G06F 1520

395163

A rasterizer 10 for converting a datastream 12 which describes a page to be printed into a rasterized pagemap bitstream 13 to be sent to a printer. The rasterization is done in four stages using parallel processors in all stages except the first, and pipelining the processors between all of the stages. In the first stage 11, a scan processor 14 identifies and stores state-independent blocks 14 in the datastream. In the second stage 17, parallel block processors 22 convert the scanned blocks into stored intermediate-form data objects 20 and request preparation of often-used resources such as characters. In the third stage 23, the objects are sorted and stored by geographical region of the pagemap by parallel sort processors 24. In the fourth stage 31, the sorted objects are rasterized into pelmaps and placed in the pagemap by parallel bin processors 30. All four stages are pipelined.

55926126, Jan 7, 1997

Apr 28, 1995

8/431189

Yitzhak Birk - San Francisco CA

G01R 3128
G06F 1100

39518204

A sewer system for storing and supplying data to a destination. The server system includes a plurality of disk drives for storing data, a buffer memory for temporarily storing a portion of the data from the disk drives which is soon to be supplied, a reconstruction unit for reconstructing a portion of the data from at least one of the disk drives using a portion of the data from a plurality of the remaining disk drives so that at least one of the disk drives holding data belonging to the current parity group can be bypassed (either because that disk is faulty or because there are already many queued read-requests for it), a control unit for controlling the server system, and an output unit for outputting data from either or both of the buffer memory and the reconstruction unit. The server system prevents congestion problems from persisting, reduces buffering requirements, and provides load balancing and fault tolerance. Preferably, the server system is a video storage server and the data being stored is video data.

RE352624, Jun 4, 1996

Sep 7, 1994

8/301951

Yitzhak Birk - Palo Alto CA

International Business Machines Corporation - Armonk NY

G02B 600
G02B 636

385 24

A shared directional multichannel for efficiently transmitting k=( log. sub. p n choose (p-1) concurrent, non-interfering transmissions from a set of m. gtoreq. k source stations, each having p transmitters, to a set of n destination stations, each having one receiver, without active repeater components. The multichannel architecture permits implementation of an efficient single-hop multichannel system using optical star couplers in a manner that limits the power spreading loss to the n/p value known for bus-oriented networks instead of n. sup. 2 /p. Several coupling stages are employed, each stage having a plurality of identical substantially-square directional couplers, to obtain channel concurrency k, which is an improvement over the concurrency p available in bus-oriented networks, without the higher power spreading loss normally arising from the larger number of connections between each source station and every destination station.

51465140, Sep 8, 1992

Sep 30, 1991

7/769988

Yitzhak Birk - Palo Alto CA

International Business Machines Corporation - Armonk NY

G02B 600
G02B 636

385 24

A shared directional multichannel for efficiently transmitting k=( log. sub. p n choose (p-1)) concurrent, non-interfering transmissions from a set of m. gtoreq. k source stations, each having p transmitters, to a set of n destination stations, each having one receiver, without active repeater components. The multichannel architecture permits implementation of an efficient single-hop multichannel system using optical star couplers in a manner that limits the power spreading loss to the n/p value known for bus-oriented networks instead of n. sup. 2 /p. Several coupling stages are employed, each stage having a plurality of identical substantially-square directional couplers, to obtain channel concurrency k, which is an improvement over the concurrency p available in bus-oriented networks, without the higher power spreading loss normally arising from the larger number of connections between each source station and every destination station.