Pulse or digital communications – Spread spectrum – Direct sequence
Patent
1998-08-31
2000-12-19
Le, Amanda T.
Pulse or digital communications
Spread spectrum
Direct sequence
348473, 386 94, 360 60, 380203, 375146, 375147, H04N 591
Patent
active
061635650
ABSTRACT:
Video signals are converted into one or more blocks for each predetermined unit amount of data, and a discrete cosine transform (DCT) process is performed in the blocks to convert a video signal from a time-base area signal to a DCT coefficient in a frequency area for data compression. One chip of a spread spectrum signal is allocated to each block of the video signal or to each of a plurality of blocks, and additional information is superimposed on the video signal at a constant level corresponding to a chip value for transmission. The video signal on which the additional information consisting of the spread spectrum signal transmitted has been superimposed is received, and from this received signal, a DC component of the DCT coefficient is extracted. Inverse spread spectrum processing is performed for the DC component of the DCT coefficient extracted to detect the additional information.
REFERENCES:
patent: 6023551 (2000-02-01), Sugita et al.
patent: 6058243 (2000-05-01), Ogino et al.
patent: 6069665 (2000-05-01), Ikeda et al.
Ikeda Nozomu
Kimura Yuji
Kohashi Takashi
Moriwaki Hisayoshi
Ogino Akira
Le Amanda T.
Maioli Jay H.
Sony Corporation
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