A method for displaying at a selected station special service information during a silent interval between ringing signals from a telephone switching system, said system being capable of sending to said selected station a modulated and an unmodulated signal during said silent interval, said modulated signal representing said special service information; said method comprising the steps of: detecting said unmodulated signal during said silent interval between said ringing signals; responsive to the detection of said unmodulated signal, receiving said modulated signal representative of said special service information during said silent interval; storing said special service information during said silent interval; and displaying said stored special service information at said selected station during said silent interval. view more

The method as set forth in claim 1 wherein said method further comprises the step of filtering said modulated and unmodulated signals from said ringing signals during said silent interval.

The method as set forth in claim 4 in which special services information further includes a message length and wherein said step of receiving said modulated signal representative of said special services information further includes the step of receiving said modulated signal representative of said message length to store said special service information during said silent interval. view more

An apparatus for decoding a compressed digital video signal, comprising: a means for receiving a compressed digital video bit stream; and a means responsive to a motion compensation type signal for selectively and adaptively performing motion compensated decoding of frames of the compressed video bit stream. view more

The apparatus of claim 13, in which the decoding means comprises: an adaptive inverse scanning means responsive to a coding type signal.

The apparatus of claim 13, in which the decoding means comprises: a means responsive to a motion compensation type signal and selectively responsive to frame motion vectors and field motion vectors for producing an adaptive motion compensated estimate of a decoded video signal; a means responsive to the compressed digital video bit stream for producing a decoded estimate error signal; and a means responsive to the adaptive motion compensated estimate and the estimate error signal for producing a decoded video signal. view more

The apparatus of claim 13, in which the decoding means comprises: a means responsive to a coding type signal for adaptively dequantizing the compressed digital video bit stream.

The apparatus of claim 13, in which the decoding means comprises: a means for receiving a compressed digital video signal comprising at least one DC coefficient representation related to the video signal; a means for producing an estimated DC coefficient in response to a coding type signal; and a means for producing a decoded DC coefficient signal in response to the DC coefficient representation and the estimated DC coefficient. view more

A display system having a sending unit and a viewing unit for displaying images created at said sending unit, characterized by means for displaying a selective distinctive graphic image at positions on said viewing unit corresponding to positions where said images are being changed on said sending unit. view more

The invention set forth in claim 1 wherein a first one of said distinctive graphic images represents the addition of an image to said viewing unit and a second one of said distinctive graphic images represents the removal of an image from said viewing unit. view more

The invention set forth in claim 1 wherein a first one of said selected distinctive graphic images represents the change of an image at a first one of said sending units and a second one of said selected distinctive graphics images represents the change of an image at a second one of said sending units. view more

The method of providing images on a viewing screen, said images representative of information transmitted from a sending unit, said method comprising the steps of receiving transmitted data representative of the location on said viewing screen of changed data, sequentially and repetitively providing said received data to said viewing screen, generating an overlay image, mixing said generated overlay image with said provided data to said viewing screen so that said generated overlay image is positioned with respect to a determined location of said last changed data. view more

The invention set forth in claim 15 further comprising the step of determining if said received data represents an addition or a subtraction of information from said sending unit, and wherein said generating step includes the generation of first and second overlay images controlled by whether said changed data is determined to represent said addition or subtraction, respectively. view more

The invention set forth in claim 18 further comprising the step of determining as between two sending units the currently active sending unit, and selecting a particular one of said generated graphic images depending upon the determined sending unit. view more

In a digital image display system: a memory for storing color data values; processing means responsive to a predetermined command and data sequence comprising at least one command, the processing means decoding the predetermined command and data sequence, the predetermined command and data sequence selecting one of a plurality of modes of access to color data values, the modes comprising a first mode of access wherein an in-use foreground color is directly specified as a color data value; a second mode of access wherein the in-use foreground color is specified as an index into the color memory; and a third mode of access wherein the in-use foreground color and an in-use background color are specified as indexes into the color memory; and display means responsive to the processing means, the display means displaying the colors associated with the color data values accessed by the selected mode. view more

A digital image display system comprising: a color memory for storing color data values; processing means responsive to predetermined command and data sequences, the processing means, responsive to a first command, selecting a mode of access to the color memory; and responsive to a second command, setting a color data value in the color memory; and display means responsive to the processing means, the display means displaying a color associated with the color data value accessed by the selected mode. view more

A display system as recited in claim 2, wherein the processing means responsive to a second command sets plural color data values in color memory.

In a video image display system having a color memory, a method for displaying a color image in a terminal independent manner responsive to commands and data received from a command and data source, the method comprising the steps of: receiving commands and data from the command and data source; reading a first command for selecting a mode of access to the color memory, and responsive to data following the first command, selecting the mode of access to the color memory; reading a second command for setting color data values in the color memory and, responsive to data following the second command, setting the color data values in the color memory, reading a third command for accessing color data values in the color memory, and displaying a color image associated with the color data values accessed by the third command on a video display terminal. view more