John J Limb, 55245 99Th St, New York, NY 10025

4581735, Apr 8, 1986

May 31, 1983

6/499291

Lois E. Flamm - Chatham Township, Morris County NJ
John O. Limb - Berkeley Heights NJ

AT&T Bell Laboratories - Murray Hill NJ

H04J 302
H04J 116
H04Q 1104

370 85

In order to control the transfer of packets of information among a plurality of stations, the instant communications system, station and protocol contemplate first and second oppositely directed signal paths. At least two stations are coupled to both the first and the second signal paths. A station reads one signal from a path and writes another signal on the path. The one signal is read by an arrangement which electrically precedes the arrangement for writing the other signal. Packets are transmitted in a regular, cyclic sequence. A head station on a forward path writes a start cycle code for enabling each station to transmit one or more packets. If a station has a packet to transmit, it can read the bus field of a packet on the forward path. Responsive thereto, a logical interpretation may be made as to whether the forward path is busy or is not busy. If the path is not busy, the packet may be written on the path by overwriting any signal thereon including the busy field.

4091415, May 23, 1978

Mar 4, 1977

5/774481

John Ormond Limb - Tinton Falls NJ
Charles Edwin Roos - Nashville TN

Bell Telephone Laboratories, Incorporated - Murray Hill NJ

H04N 718

358105

Temporal changes in an object are detected by focusing light from preselected spatial locations of the object on associated first and second regions of a light sensitive target at first and second times, respectively, and by comparing the light intensity focused on the regions. The focusing apparatus includes a Ronchi grating located at an image plane between the object and a light sensitive target. At the first time, light from the object passes through the clear portions of the grating to illuminate alternate parallel stripes on the target, while at the second time, the light passing through the clear portions is shifted to illuminate the regions between the first parallel stripes. The target is then scanned, and information from associated stripes is compared to detect changes. In one embodiment, the shaft can be brought about by the use of a birefringent crystal and polarized light; alternatively, a beam splitter and a shutter arrangement can be used.

4009330, Feb 22, 1977

Apr 5, 1976

5/673631

Cassius Chapin Cutler - Holmdel NJ
John Ormond Limb - Tinton Falls NJ

Bell Telephone Laboratories, Incorporated - Murray Hill NJ

H04N 712

358 83

Apparatus is disclosed for selecting video frames indicative of still pictures from successive video frames, a portion of which are indicative of moving objects and the remaining frames are indicative of still objects. The input and output video signal paths of a frame memory are completed through switches. A speed measurement circuit utilizes the signals at the input and output of the frame memory as the video signal is applied thereto to identify frames indicative of still objects. A logic circuit that operates the switches responds to the output of the speed measurement circuit by changing the position of the switches to retain the content of the frame memory and apply same to the output signal path. Timing circuits are also advantageously utilized to slow down the selection rate of frames indicative of still objects and force the selection of a more recent video frame when the speed of movement fails to fall below a predetermined value.

4412326, Oct 25, 1983

Oct 23, 1981

6/314489

John O. Limb - Berkeley Heights NJ

Bell Telephone Laboratories, Inc. - Murray Hill NJ

H04J 600

370 85

A communications path having at least two stations coupled thereto. During time intervals when no station on the path has a packet to transmit, start-of-cycle packets for timing and synchronizing the stations are routinely transmitted between respective ends of the path. When a station has a packet of information to transmit, the station monitors the path for detecting whether or not the path is busy. On the one hand, if the path is not busy, a predetermined delay is introduced before the station is permitted to transmit a packet. The delay is related to the electrical distance between the station, which has the packet to transmit, and a station, which priorly transmitted a packet including a start-of-cycle packet. Also, the delay begins when the priorly transmitted packet is received by the station. On the other hand, if the path is busy, the station monitors the path until the path becomes not busy at which point the predetermined delay is introduced, the delay being related to the electrical distance between the station and that station which caused the path to be busy.

4439763, Mar 27, 1984

Sep 3, 1981

6/298954

John O. Limb - Berkeley Heights NJ

Bell Telephone Laboratories, Incorporated - Murray Hill NJ

H04Q 900
H04J 602

3408255

With the advent of digital communications, it is common to transfer packets of information among a plurality of stations, e. g. , digital computers. In order to control the transfer of the packets, various protocols have been introduced. However, the efficiency related to known multiples access digital communications system protocols tends to decrease as the digital signal rate increases. To overcome such problems, the instant communications system and protocol contemplate a communications loop having first and second oppositely directed signal paths. At least two stations are coupled to both the first and the second signal paths. A station includes an arrangement for writing a first signal on the first path and an arrangement for reading a second signal from the second path. In addition, the station includes an arrangement for reading a third signal from the first path. The third signal is coupled from the first path to the station by an arrangement which electrically precedes the arrangement for writing the first signal on the first path.

4542502, Sep 17, 1985

Dec 30, 1983

6/567350

Frank H. Levinson - Hanover Township, Morris County NJ
John O. Limb - Berkeley Heights NJ

AT&T Bell Laboratories - Murray Hill NJ

H04J 300

370 88

In order to control the transfer of packets of information among a plurality of stations, e. g. , digital computers, the instant communications system, station and protocol contemplate first and second oppositely directed signal paths. At least two stations are coupled to both the first and the second signal paths. A station includes arrangements for reading (and writing) signals from (and on) each of the two paths. Signals are read from either path by an arrangement which electrically precedes the arrangement for writing signals on the path. If the station has a packet to transmit, it can overwrite a busy control field of a packet on either path. Also having read a packet signal from the path, a logical interpretation may be made within the station as to whether the path is busy or is not busy. If the path is not busy, the packet may be written on the path by overwriting any signal thereon. If the path is busy, the station may defer the writing until the path is detected as not busy e. g.

4129882, Dec 12, 1978

May 6, 1977

5/794361

John O. Limb - Tinton Falls NJ

Bell Telephone Laboratories, Incorporated - Murray Hill NJ

H04N 902

358 13

The luminance and two chrominance signals generated in a color video system are all translated into pulse code modulation signals by a plurality of analog-to-digital encoders. The luminance signal is then differentially encoded into variable length digital words and applied to a buffer. The encoded differences of the luminance signal are between the values of successive picture elements along horizontal scan lines. At least one of the chrominance signals is encoded using differences between corresponding picture element values in alternate horizontal scan lines. When the differences are large, the value of the corresponding picture element of the intermediate horizontal scan line is classified. If half the difference between the large transition of alternate picture element values does not correspond to the value of the intermediate picture element, another code word indicative of both intermediate picture element and alternate picture element is used. This improves the coding accuracy of large transitions in the chrominance signal which is also applied to the buffer.