Quadrature amplitude modulation with line synchronization pulse

Details Quadrature amplitude modulation with line synchronization pulse Quadrature amplitude modulation with line synchronization pulse

1988-06-28

1990-04-17

Ng, Jin F.

Telephonic communications

Having light wave or ultrasonic link for speech or paging...

Including fiber optic link within telephone network

379 93, 379 98, 379100, 375 39, 358 13, 358 85, 358141, 358469, H04M 1100, H04L 2720, H04L 2722

Patent

active

049187180

ABSTRACT:
The present invention assigns amplitudes of sine wave cycles in a data packet on I and Q channels of a QAM signal to color, gray or luminance values. Overlapping sine wave cycles on the I and Q channels in the data packet are assigned to the same or neighboring pixels. A synchronizing signal is sent at the beginning of each transmission of a packet. The synchronizing signal is a plurality of cycles at a maximum amplitude on the I and Q channels. The synchronizing signal serves two functions simultaneously. First, it is used to indicate the beginning of a new packet. Second, the phase of the synchronizing signal is used to initialize the demodulator phase detecting circuitry.

REFERENCES:
patent: 3517117 (1970-06-01), Woodbury
patent: 4544945 (1985-10-01), Lewis, Jr. et al.
patent: 4562467 (1985-12-01), Bradley
patent: 4739413 (1988-04-01), Meyer
patent: 4780884 (1988-10-01), Karabinis

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