TELEVISION TRANSMISSION SYSTEM FOR TWO CLASSES OF INFORMATION

• US 3,730,986 A
• Filed: 04/05/1971
• Issued: 05/01/1973
• Est. Priority Date: 04/05/1971
• Status: Expired due to Term

• Current Assignee: Charles A. Morchand
• Original Assignee: Charles A. Morchand
• Inventors: Morchand, Charles A.
• Primary Examiner(s): Murray, Richard
• Application Number:
  US05/131,231
• Time in Patent Office: 757 Days
• Field of Search: 178/5.6,5.8,6.8,DIG.23
• US Class Current: 348/473
• CPC Class Codes: H04N 1/00098 via a television channel, e.g. for a series of still pictures with or without sound

Abstract

A television transmission system normally transmits fields of general viewer information which is interspersed with cuts. After at least some of the cuts a field of special viewer information is transmitted instead of the field of general viewer information. Associated with the field of special viewer information is a characteristic signal to identify the field so that a special television receiver, upon sensing the signal, can extract the field of special viewer information for display.

Claims

1. A television transmission system comprising a first source of at least fields of general viewer information wherein the general viewer information is interspersed with cuts, a second source of at least portions of fields of special viewer information, transmitter means for transmitting at least fields of general and special viewer information, switching means for normally connecting said first source to said transmitter means, means for sensing for the interspersed cuts, control means responsive to the sensing of a cut by said sensing means to cause said switching means to connect said second source to said transmitter means for a given period of time.

2. The television transmission system of claim 1, wherein said second source is connected to said transmitter means for at least one field time.

3. The television transmission system of claim 1 further comprising means for introducing into the information transmitted by said transmitter means a characteristic signal at least at the start of each transmission of special viewer information.

4. The television transmission system of claim 2 further comprising means for causing the transmitter means to transmit a characteristic signal at the start of the transmission of a field of special viewer information.

5. The television transmission system of claim 4 further comprising receiver means, said receiver means including display means for displaying at least fields of general and special viewer information, and display control means detecting said characteristic signal for controlling said display means to display only fields of special viewer information.

6. The television transmission system of claim 4 further comprising relay means for receiving and retransmitting the fields of viewer inforMation, said relay means including means responsive to said characteristic signal for deleting the transmission of fields associated with said characteristic signal.

7. The television system of claim 4 further comprising relay means for receiving and retransmitting the fields of general and special viewer information, said relay means including means responsive to said characteristic signal for only transmitting fields associated with said characteristic signal.

8. The television system of claim 1 wherein said cut-sensing means comprises means for monitoring signal characteristics of the fields of general viewer information.

9. The television system of claim 1 wherein the signals representing the information from said second source are of lower amplitude than the signals representing the information from said first source.