Quadrature modulation circuit

Details Quadrature modulation circuit Quadrature modulation circuit

1991-11-13

1994-02-08

Kuntz, Curtis

Pulse or digital communications

Repeaters

Testing

375 60, 332103, H04L 2704, H04L 2712, H04L 2720

Patent

active

052854795

ABSTRACT:
A quadrature modulation circuit includes a low pass filter which operates by a time division process for the in-phase channel and quadrature-phase channel, and reduces address requirements data using amplitude symmetry of the wave form and/or using symmetry wave form on the time axis. The capacity of the ROM is reduced by half or more and the configuration of the quadrature modulation circuit is simplified.

REFERENCES:
patent: 3971996 (1976-07-01), Motley et al.
patent: 4327439 (1982-04-01), Gockler et al.
patent: 4613976 (1986-09-01), Sewesinson et al.
patent: 4881049 (1989-11-01), Yagi
patent: 4990867 (1988-04-01), Ogura et al.
patent: 5091705 (1992-02-01), Hiramatsu et al.
patent: 5140613 (1992-08-01), Birgenheier et al.
patent: 5144256 (1992-09-01), Lim

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