Data decoder adapted to decode data of different rates and/or en

Details Data decoder adapted to decode data of different rates and/or en Data decoder adapted to decode data of different rates and/or en

1993-03-25

1996-01-23

Kostak, Victor R.

Television

Nonpictorial data packet in television format

Data separation or detection

348468, H04N 708

Patent

active

054868653

ABSTRACT:
A data decoder, for example, for decoding teletext and VPS data, comprises an input signal clamp and synchronizing signal separator circuit which receives a combined video and blanking signal and produces synchronizing pulses for a timing circuit and video signals which are applied to an ADC and a data slicer and clock regenerator (DSCR). Sliced data and clock signals feed an acquisition circuit which acquires selected data which is stored in a memory via a memory interface. A control circuit is arranged to modify the DSCR, acquisition circuit and memory interface dependence upon the type of data detected. The arrangement decoder is set to decode data of one type, for example, teletext, and if no valid teletext data is detected within a given period, for example, four television frames, the control circuit causes the decoder to attempt to decode data of the other type (VPS).

REFERENCES:
patent: 5113440 (1992-05-01), Harney et al.
patent: 5343300 (1994-08-01), Hennig
Junke, Manfred; "A Multistandard Teletext Processor", IEEE Transaction on Consumer Electronics vol. 38 No. 3 Aug. 1992.
James, Shirley; "New Devices for VCR Control Using Teletext Services", IEEE Transaction on Consumer Electronics vol. 38 No. 3 Aug. 92.
Tarrant, D. R.; "Advances in Teletext Decoder Design", IEEE Transaction of Consumer Electronics vol. 35, No. 3 Aug. 89.
IEEE Transactions On Consumer Electornics, vol. 38, No. 3, Aug. 1992, pp. 288-295, New Devices For VCR Control Using Teletext Services.

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