Apparatus and a method for quadrature-phase encoding and transmi

Details Apparatus and a method for quadrature-phase encoding and transmi Apparatus and a method for quadrature-phase encoding and transmi

1992-09-25

1994-01-11

Groody, James J.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358 36, 358 16, H04N 1100, H04N 700

Patent

active

052786374

ABSTRACT:
A system for encoding digital data into a video signal first encodes the digital data into in-phase and quadrature-phase component signals, using a 16 quadrature amplitude modulation (16 QAM) technique. The in-phase and quadrature-phase signals are then used to modulate respective quadrature phase related Fukinuki carrier signals. These modulated carrier signals are combined with the video signal after the video signal has been modified to ensure that all information in the band of frequencies occupied by the modulated Fukinuki carrier signals is identical between the two fields of each frame. The result is a composite video signal in which the digital data is imperceptibly encoded. This signal is decoded by separating the band of frequencies occupied by the Fukinuki modulated data from other frequencies in the video signal and subtracting the second field of each frame from the first field and then demodulating the result using a 16 QAM demodulator.

REFERENCES:
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patent: 5053858 (1991-10-01), Koslov et al.
patent: 5122868 (1992-06-01), Isnardi
patent: 5128747 (1992-07-01), Isnardi et al.
T. Fukinuki & Y. Hirano, "Extended Definition TV Fully Compatible with Existing Standards," IEEE Trans. on Communications, COM-32, No. 8, pp. 948-953 (Aug. 1984).
M. A. Isnardi, "Multidimensional Interpretation of NTSC Encoding and Decoding," IEEE Trans. on Consumer Electronics, vol. 34, No. 1, pp. 179-193 (Feb. 1988).
M. Schwartz, "Information Transmission, Modulation, and Noise," McGraw-Hill, Inc., pp. 226-235 (1980).

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