Back to results
US 4,543,616 AGranted
Video recording and display equipment
AssigneeThorn Emi Ferguson Limited
InventorDavid Brooks
Life of this patent
Estimating the term…
Abstract
In the recording of broadcast television text, the text is separated from the video signal and formed into blocks at slicer and then is fed into shift register. It is then taken out at a data rate lower than that when broadcast and coding is assigned to at least some of the blocks prior to recording onto a video cassette tape recorder. Retrieval and display incorporate similar functions in reverse order. In another embodiment data in block form is stored on a video disk for similar retrieval and display.
Claims7
Video recording equipment comprising:
- means to receive a composite signal having standard video information and teletext data, the teletext data occupying a predetermined number A of television line periods in the field blanking period of the standard video information;
- a signal encoder;
- means in the encoder, to separate out teletext data from a received composite signal;
- means, in the encoder, to reduce the rate of the teletext data from its value at the reception means;
- adding means, in the encoder, to combine the output of the receiving means and the output of the rate-reducing means in order to insert the reduced rate teletext data in a number, corresponding to N.times.A (where N>1), of line periods in the field blanking period of the composite signal;
- means to record the combined signal output from the mixing means.
3 more elements
Video display equipment comprising:
- means to derive, from a recording, a combined signal having standard video information and teletext data, the teletext data occupying a predetermined number A of television line periods in the field blanking period of the standard video information and the teletext data being at a rate reduced in comparison to the rate of broadcast-teletext;
- a signal decoder;
- means, in the decoder, to separate out the teletext data from the combined signal;
- means, in the decoder, to increase the rate of the teletext data to a value substantially corresponding to that of broadcast-teletext;
- adding means, in the decoder, to combine the output of the derivation means and the output of the rate increasing means in order to insert the teletext data, which is at broadcast rate, in a number, corresponding to N.times.A (where N>1), of line periods in the field blanking period of the combined signal, thereby to form a composite signal;
- and
- means to display the composite signal.
4 more elements
Video recording equipment comprising:
- means to receive, e.g. by broadcast, a composite signal having standard video information and teletext data, the teletext data occupying a predetermined number A of television line periods in the field blanking period of the standard video information;
- a signal encoder;
- means in the encoder, to separate out teletext data from a received composite signal;
- means, in the encoder, to reduce the rate of the teletext data from its value at the reception means;
- adding means, in the encoder, to combine the output of the receiving means and the output of the rate-reducing means in order to insert the reduced rate teletext data in a number, corresponding to N.times.A (where N>1), of line periods in the field blanking period of the composite signal;
- means to record the combined signal output from the mixing means;
- means to playback a recording of a combined signal having standard video information and teletext data, the teletext data occupying a predetermined number A of television line perods in the field blanking period of the standard video information and the teletext data being at a rate reduced in comparison to the rate of broadcast-teletext;
- a signal decoder;
- means, in the decoder, to separate out the teletext data from the combined signal;
- means, in the decoder, to increase the rate of the teletext data to a value substantially corresponding to that of broadcast-teletext;
- adding means, in the decoder, to combine the output of the derivation means and the output of the rate-increasing means in order to insert the teletext data, which is at broadcast rate, in a number, corresponding to N.times.A (where N>1), of line periods in the field blanking period of the combined signal thereby to form a composite signal for display.
8 more elements
Dependencies are inferred from the claim text.