Video and audio blanking system
DCFirst Claim
1. A television editing system activated by transmitted digital codes for blanking at least part of the output of a receiver, in which the receiver includes at least a portion of a captioning circuit means for detecting digital data if present in the transmitted signal and supplying the data to a data bus;
- wherein said editing system comprises an auxiliary circuit which includes a character detector, rating select switch means, and blanking logic means;
the character detector having inputs coupled to said data bus, means for decoding predetermined digital codes of a special set of characters, and output to rating signal lines, there being a separate rating signal line for each character of said special set;
the rating select switch means having settings for different ratings; and
the blanking logic means having logic circuits coupled to the rating signal lines and to the rating select switch means to compare the switch setting to signals on the rating signal lines, and in response to the comparison to generate a logic output signal condition for selectively either blanking or not blanking at least part of the receiver output.
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Reexamination
Accused Products
Abstract
An auxiliary circuit for remote control of television receiver blanking (audio and video) by digital code words transmitted as part of the video signal. The circuit detects and decodes the transmitted code and depending upon the code received, blanks either or both the audio and video signals in the receiver. A selector switch would be interconnected with the digital decoder to permit selection of particular code words which will cause the circuit to blank. The selector switch will normally be available for the television viewer to control. The transmitter for transmitting the digital code in the preferred configuration would comply with FCC Rules and Regulations specifying program related ASCII transmissions on line 21 of picture field 1.
285 Citations
14 Claims
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1. A television editing system activated by transmitted digital codes for blanking at least part of the output of a receiver, in which the receiver includes at least a portion of a captioning circuit means for detecting digital data if present in the transmitted signal and supplying the data to a data bus;
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wherein said editing system comprises an auxiliary circuit which includes a character detector, rating select switch means, and blanking logic means; the character detector having inputs coupled to said data bus, means for decoding predetermined digital codes of a special set of characters, and output to rating signal lines, there being a separate rating signal line for each character of said special set; the rating select switch means having settings for different ratings; and the blanking logic means having logic circuits coupled to the rating signal lines and to the rating select switch means to compare the switch setting to signals on the rating signal lines, and in response to the comparison to generate a logic output signal condition for selectively either blanking or not blanking at least part of the receiver output. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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Specification