Multiplex signal processing apparatus

Details Multiplex signal processing apparatus Multiplex signal processing apparatus

1988-11-09

1991-10-29

Shepperd, John W.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358 12, H04N 704, H04N 706

Patent

active

050619993

ABSTRACT:
A signal of the same frequency band as an ordinary NTSC signal of the video signals is transmitted with the conventional frequency band but the other frequency components are frequency-converted to a frequency higher than the sound subcarrier as the multiplex signal. The ordinary video signal, sound subcarrier and multiplex signal are frequency-multiplexed and the main carrier is transmitted by angle modulation as the modulation signal. In this case, as the multiplex signal, a signal other than the ordinary signal may directly be frequency-multiplexed and the signal may be multiplexed. Using amplitude or angle modulation to improve the demodulation accuracy or S/N through the angle modulation. The ordinary signal is regenerated like in the conventional system, without influence on the conventional receiver. In addition, since the ordinary video signal and the multiplex signal are separated in the frequency band, these may be used as the independent new transmission bands. Therefore, information other than the video signal can also be transmitted.

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patent: 4589011 (1986-05-01), Rzeszewski
patent: 4652903 (1987-03-01), Lucas
patent: 4706109 (1987-11-01), Murray
"An Extended Definition Television System Using Quadrature Modulation of the Video Carrier with Inverse Nyquist Filter", Yasumoto et al., 8-1987, vol-CE-33, No. 3, pp. 173-180, IEEE Transactions on Consumer Electronics.
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Nikkei Electronics, 1987.11.2 (No. 433) pp. 189-212.
Nikkei Electronics, 1987.8.10 (No. 427) pp. 97-112.

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