Sun Microsystems, Inc.

Cube Root, Inc.

Robert Sloan

David Evans

James Thompson

David W Stewart

Don Jackson

Maureen Arios

Paul D'Arcy

A device for indicating elapsed time by way of the state of indicators is disclosed, such indicators being arranged in at least four groups such that the first two groups taken together indicate elapsed hours and the second two groups taken together indicate elapsed minutes. The indicators are switchable between a first and second state, such as illuminated or not illuminated. The number of indicators in a first state, such as illuminated, indicate the value of a digit.

Device for the indication of elapsed time

An interface for translating signals from a ISDN terminal to an analog telephone terminal including apparatus for separating ISDN signals into control and data signals, apparatus for utilizing the control signals to generate tone signals for transfer to a telephone line, apparatus for translating the digital control signals into signals controlling the transfer of data from digital to analog form, apparatus for translating digital signals in ISDN format into analog signals under control of the apparatus for translating the digital control signals into signals controlling the transfer of data from digital to analog form, apparatus for translating control signals in analog tone format to digital signals for controlling the transfer of signals to an ISDN terminal, apparatus for using the control signals for controlling the transfer of data from analog to digital form, and apparatus for translating analog signals into digital signals in ISDN format under control of the digital signals for controlling the transfer of signals to an ISDN terminal.

Apparatus for providing an ISDN to analog interface

The present invention provides for at least two levels of buffering in compensating for the delays from and out of the Unix workstation, thus achieving the required timebase correction. At the first level of buffering there is an eight Megabyte memory coupled to the VME bus of the Unix workstation over a disc simulator processor, which is sufficient to store about 45 seconds of audio data. The secondary level of data buffering is provided by an interface board which further buffers an additional 1.5 milliseconds between the first level of buffering and the second level of buffering. The outbound interface of the present invention comprises three separate registers to process the compact disc data when they are retrieved from the digital computer. Each of the registers comprises a plurality of FIFO registers. The first register receives outbound audio samples. The second register receives Q subcode data. The third register receives optionally QRSTUVW or RSTUVW subcode data. Instead of burdening the Unix software with the task of interleaving the subcodes, the present invention manages and manipulates the subcodes with the hardware of the interface. An inbound interface similar to that of the outbound interface is also provided for receiving and storing compact disc data. Thus, the present invention can store and replay compact disc data simultaneously.

Digital computer interface for simulating and transferring CD-I data

An interface which includes a MIDI send terminal having first and second pins for providing an output signal, an RS 232 terminal having first and second pins for receiving a signal from the MIDI send terminal, apparatus for coupling any MIDI output signal to the RS 232 terminal, the apparatus for coupling including apparatus for shifting a base level at which the signals are presented at the MIDI terminal to a base level at which the signals are received at the RS 232 terminal, apparatus for shifting the voltage swing of signals presented at the MIDI terminal to a voltage swing at which the signals are received at the RS 232 terminal, and apparatus for disabling the RS 232 terminal if a device to which the RS 232 terminal is connected would normally respond in an undesirable manner to unexpected data received on the RS 232 terminal.

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Sunnyvale, CA, United States of America

Robert Sloan