Display control device for superimposing data with a broadcast signal on a television screen

Claim 1

A system for superimposing information from an electronic processing device onto a television broadcast being displayed on a display screen of a television receiver, comprising: a television receiver including display means for displaying a television broadcast and information; data processing means for generating actual data and information; and control means, operatively connected to said television receiver and said data processing means, for controlling an exchange of data between said television receiver and said data processing means; said control means including, storage means, operatively connected to said data processing means, for storing said actual data and information from said processing means, said actual data and information to be displayed on said display means, oscillator means, operatively connected to said television receiver, for producing clock signals in synchronism with horizontal and vertical synchronizing signals developed by said television receiver, timing means, operatively connected to said oscillator means, for defining a horizontal scanning display period, a horizontal scanning retrace period, a vertical scanning display period, and a vertical retrace period corresponding to said clock signals, and transfer means, operatively connected to said storage means and said display means, for transferring said actual data and information stored in said storage means to said display means in response to said timing means; said timing means providing a signal representing said vertical retrace period to said data processing means; said data processing means generating said actual information and data to be displayed on said display means when said signal representing said vertical retrace period is received from said timing means; said timing means developing a character timing signal, said character timing signal including a plurality of character representation pulses each representative of a character having a predetermined number of display dots, each plurality of character representation pulses having a frequency distinct from a chrominance subcarrier frequency of a broadcast signal being supplied to said television receiver; said timing means including, count means for counting said character representation pulses, and modification means, operatively connected to said count means, for modifying the count of said count means so as to alter a length of said character representation pulses developed during each horizontal retrace period so that the chrominance subcarrier frequency is a multiple frequency of a frequency of all of said character representation pulses developed during both said horizontal scanning retrace period and said horizontal scanning display period.

Claim 2

A system for superimposing information from an electronic processing device onto a television broadcast being displayed on a display screen of a television receiver, comprising: a television receiver including display means for displaying a television broadcast and information; data processing means for generating actual data and information; and control means, operatively connected to said television receiver and said data processing means, for controlling an exchange of data between said television receiver and said data processing means; said control means including, storage means, operatively connected to said data processing means, for storing said actual data and information from said processing means, said actual data and information to be displayed on said display means, oscillator means, operatively connected to said television receiver, for producing clock signals in synchronism with horizontal and vertical synchronizing signals developed by said television receiver, timing means, operatively connected to said oscillator means, for defining a horizontal scanning display period, a horizontal scanning retrace period, a vertical scanning display period, and a vertical retrace period corresponding to said clock signals, and transfer means, operatively connected to said storage means and said display means, for transferring said actual data and information stored in said storage means to said display means in response to said timing means; said timing means providing a signal representing said vertical retrace period to said data processing means; said data processing means generating said actual information and data to be displayed on said display means when said signal representing said vertical retrace period is received from said timing means; said timing means developing a character timing signal, said character timing signal including a plurality of character representation pulses each representative of a character having a predetermined number of display dots, each plurality of character representation pulses having a frequency distinct from a chrominance subcarrier frequency of a broadcast signal being supplied to said television receiver; said timing means including, count means for counting said character representation pulses, and modification means, operatively connected to said count means, for modifying the count of said count means so as to alter a length of said character representation pulses developed during each horizontal retrace period so that the chrominance subcarrier frequency is a multiple frequency of a frequency of all of said character representation pulses developed during both said horizontal scanning retrace period and said horizontal scanning display period.