Modulators – Amplitude modulator – Nonlinear device controlled by modulating signal
Patent
1978-06-28
1979-12-18
Grimm, Siegfried H.
Modulators
Amplitude modulator
Nonlinear device controlled by modulating signal
178 66A, 325161, 332 26, 333150, 333187, H04L 2720
Patent
active
041796721
ABSTRACT:
A phase modulation system is described in which the phase of a carrier wave can assume one of a number of permitted values in each symbol period and wherein transitions between the permitted values occur at transition periods between symbol periods. Difficulties associated with phase transitions are reduced or overcome by storing or generating the transitions with a number of cycles of the carrier wave of the appropriate phase(s) on either side thereof, a wave train being built up by merging the corresponding oscillations of the same phase which succeed and preceed respectively two adjacent transitions.
REFERENCES:
patent: 3969590 (1976-07-01), Jain et al.
patent: 3988540 (1976-10-01), Scott et al.
Hartman et al., "Impulse Model Design of Acoustic Surface-Wave Filters", IEEE Transactions on Microwave Theory and Techniques, vol. MTT-21, Apr. 1973, pp. 162-175.
Bell, Jr. et al., "Application of Acoustic Surface-Wave Technology to Spread Spectrum Communications", IEEE Transactions on Microwave Theory and Techniques, vol. MTT-21, Apr. 1973, pp. 263-271.
E M I Limited
Grimm Siegfried H.
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