Abstract: A subscriber system (10), operating in combination with other similar subscriber systems, for collectively and swiftly distributing multiple copies of digital data to a large number of other subscriber systems. The subscriber system (10) receives digital data and stores it on a storage device (38). An autonomous digital data communication subsystem (42) then obtains a copy of the digital data directly from the storage device (30) and transmits that data to another subscriber system. The autonomous digital data communication subsystem (42) includes transceivers (72, 82, 102 or 104) for exchanging digital data with ISDN communication channels (46, 44a, 44b or 44c). The transceivers (72, 82, 102 or 104) receive the digital data from a random access memory ("RAM") (56) included in the autonomous digital data communication subsystem (42). A SCSI controller (52) exchanges the digital data between the RAM (56) and the storage device (38) of the subscriber system (10).

Abstract: An assembly and delivery circuit and method of operation therefor which delivers a stream of pixel formatted digital video data as words to an internal bus of a host personal computer. The host personal computer receives and processes the words assembled and delivered by this circuit to present a video image on its display screen. The assembly and delivery circuit operates in conjunction with the host computer's internal bus at a sufficient speed to permit a host personal computer having a sufficient operating speed to display either black and white images, or color television images at a real-time rate of thirty frames per second.

Abstract: If motion occurs in an area viewed by a lens (14) of a video camera (12), a video security monitoring system (10) establishes a communication link with a video monitoring facility and begins transmitting compressed video images of the area. The system (10) is fabricated from CMOS integrated circuits, and operates at a reduced clock frequency while motion is not detected. Reducing the clock frequency lowers the required power thus permitting operation of the system (10) on energy supplied by an ISDN basic access communication channel. If motion occurs, a digital video image compression subsystem (16) begins producing low quality compressed video data for transmission to the monitoring facility. If motion occurs in the central region of the area viewed by the lens (14), then the subsystem (16) produces a single high quality compressed video image. Commands transmitted from the monitoring facility to the video security monitoring system (10) may control its entire operation.

Abstract: The technical field of the invention generally concerns systems for audiovisual teleservices using digital telecommunication services such as Integrated Services Digital Network ("ISDN") communications. In the preferred embodiment, an interface subsystem (100) includes an ISDN interface circuit (130) for concurrently exchanging audiovisual information with an ISDN access. The interface subsystem (100) also includes a host computer interface circuit (144)for exchanging video, audio, high-speed, a low-speed data with a host digital computer. A computer program executed by a digital signal processing circuit (122) implements CCITT's H.221 and H.242 Recommendations for audiovisual teleservices, and provides a computer program at the application layer (44) of the OSI model that is executed by the host digital computer with an interface by which it can exchange video, audio, high-speed, and low-speed data with another compatible terminal using digital telecommunications.

Abstract: An apparatus for displaying on a monitor screen of a computer either a color television picture or a black and white television picture at a frame repetition rate sufficient to show smooth motion in the displayed television picture. The apparatus digitizes an analog television signal to assemble an entire frame of digital video words in a video frame memory. After assembling the frame of digital video words, the apparatus communicates that fact to the computer, and then, responsive to a signal from the computer, transfers the entire frame of the digital video words from the video frame memory to the computer over the computer's processing bus.

Abstract: The invention is an adaptor which permits using a digital telephone device with an incompatible telephone network access. In its most preferred embodiment, the present invention is an adaptor which permits an ISDN telephone device to exchange digital data with two Switched-56 Access. An ISDN Basic Rate Access interface circuit interfaces with the ISDN telephone device, while two Switched-56 Access interface circuit interfaces with two Switched-56 Access. The adaptor also includes a clock recovery circuit for synchronizing digital data transfers occurring between the ISDN Basic Rate Access interface circuit and the ISDN telephone device with the digital data transfers occurring between the Switched-56 Access interface circuit and the Switched-56 Access.

Abstract: An assembly and delivery circuit and method of operation therefor which delivers a stream of pixel formatted digital video data as words to an internal bus of a host personal computer. The host personal computer receives and processes the words assembled and delivered by this circuit to present a video image on its display screen. The assembly and delivery circuit operates in conjunction with the host computer's internal bus at a sufficient speed to permit a host personal computer having a sufficient operating speed to display either black and white images, or color television images at a real-time rate of thirty frames per second.

Abstract: On a single plug-in card of standard dimensions for insertion in a desk model computer are mounted all the necessary components to provide display on a portion of the computer screen as selected and controlled by the computer, a television picture or similar compatible display, and reproduce an associated audio signal. The miniature television adapter functions within the operating cycle of a host computer capable of operating in a multi-program with split or overlay display screen capability. It does not preempt or override any normal computer functions. Its specially designed signal processing and data word assembly and delivery circuitry make possible delivery of a digitally formatted television data stream at a sufficient speed to enable display according to the model of the device of either black and white or color television images at a rate of thirty frames per second when used with a computer of sufficient operating speed.