Wavephore, Inc.

Gerald D Montgomery

Jay B Norrish

Charles Jungo

Richard C Gerdes

Christopher J Schur

Signal processors for permitting the transparent, simultaneous transmission and reception of a volume of information in the video bandwidth is disclosed. The volume of data is selected in response to receiving a signal at a transmitter site. The signal processor in the transmitter rasterizes the volume of information at the horizontal scanning rate and modulates the volume of information with a data carrier at a non-integral multiple of the horizontal scanning rate to provide a frequency interleaved combined signal. The combined signal is transmitted during the active video portion of each video line.

Network for retrieval and video transmission of information

The instant application is directed to a cable facsimile machine which implements the upper vestigial chrominance sideband of a standard video signal for data transmission. Signal processors for permitting the transparent, simultaneous transmission and reception of a data signal in the video bandwidth is disclosed. The signal processor in the transmitter rasterizes the data at the horizontal scanning rate and modulates the data with a data carrier at a non-integral multiple of the horizontal scanning rate to obtain frequency interleaving. The data is transmitted during the active video portion of each video line.

System for transmitting facsimile data in the upper vestigial

A controlled element for spectrum attenuation or a controlled filter is disclosed that is used to aid in the insertion of a secondary signal into a video signal without distorting the blanking intervals or close captioned data contained in the blanking interval of the video signal.

Filter by-pass for transmitting an additional signal with a video signal

Signal processors for permitting the transparent, simultaneous transmission and reception of a data signal in the video bandwidth is disclosed. The signal processor in the transmitter rasterizes the data at the horizontal scanning rate and modulates the data with a data carrier at a non-integral multiple of the horizontal scanning rate to obtain frequency interleaving. The data is transmitted during the active video portion of each video line.

Signal processors for transparent and simultaneous transmission and

Signal processors for permitting the transparent reception of a data signal in the video bandwidth of a cable television system is disclosed. The received signal has video and data components that are frequency interleaved in the video bandwidth in the active video intervals. The data signal is modulated with a carrier at a non-integral multiple of the horizontal scanning rate of the video signal. The receiver selects a forward channel transmitting the combined signal responsive to a control signal and extracts the data portion of the transmitted combined signal.

Processor for receiving data from a video signal

A secondary signal is processed and injected into a primary video signal. The injection level of the secondary signal is dynamically controlled to reduce transmission errors in the secondary signal, and to minimize interference and power level limitations. The injection level of the secondary signal may be based on video analysis of the primary signal or on error information fed back from a receiver which receives the transmitted secondary signal.

Transmitting a secondary signal with dynamic injection level control

Signal processors for permitting the transparent, simultaneous transmission and reception of a secondary data signal with a video signal in the video band is disclosed. The signal processor in the transmitter rasterizes the data at the horizontal scanning rate and modulates the data with a data carrier at a non-integral multiple of the horizontal scanning rate to obtain frequency interleaving. The data is transmitted during the active video portion of each video line.

System for transparent transmission and reception of a secondary data

A secondary signal is processed and injected into a primary color video signal. The timing of the subsequent transmission of the secondary signal is controlled by timing signals. The timing signals also control the transmission of a carrier burst prior to the transmission of the secondary data signal. This carrier burst is used by a receiver to synchronize with the transmitter, reduce transmission errors and to indicate that a data transmission is to follow.

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Mesa, AZ, United States of America

Gerald D Montgomery