Pulse or digital communications – Systems using alternating or pulsating current – Plural channels for transmission of a single pulse train
Patent
1992-09-22
1995-05-23
Chin, Stephen
Pulse or digital communications
Systems using alternating or pulsating current
Plural channels for transmission of a single pulse train
455 512, 455 92, 455102, 455118, 375216, 375224, 375356, H04L 2500, H04L 2700, H04L 2302, H04L 512
Patent
active
054188180
ABSTRACT:
A digital exciter (30) for selectively modulating digital or analog input data. The digital exciter includes a digital signal modulator (32) and a digital quadrature modulator (DQM)(36) comprising two digital signal processors (DSPs). The signal modulator is controlled by a control (40). An operator can selectively determine whether the digital exciter is used for modulating either two level or four level NRZ digital data and whether the device is to provide linear modulation or frequency modulation (FM) of the input signal. An interpolator (38) interpolates a 662/3 kHz timer interrupt rate used in the signal modulator to a 400 kHz rate, thereby reducing the processing load on the DSP comprising the DQM by simplifying the sine and cosine values used in the quadrature modulation. An operator can select from among a plurality of operating parameters on a menu for controlling the signal modulator, either from a local or a remote video display terminal (VDT).
REFERENCES:
patent: 4255814 (1981-03-01), Osborn
patent: 4262361 (1981-04-01), Hauer
patent: 4381546 (1983-04-01), Armstrong
patent: 4570265 (1986-02-01), Thro
patent: 4606049 (1986-08-01), Daniel
patent: 4617537 (1986-10-01), Nossek
patent: 4672633 (1987-06-01), Claasen et al.
patent: 4748685 (1988-05-01), Rozanski, Jr.
patent: 4807257 (1989-02-01), Schouhamer Immink et al.
patent: 4835792 (1989-05-01), Davarian
patent: 4843613 (1989-07-01), Crowle
patent: 5003617 (1991-03-01), Epsom et al.
patent: 5046128 (1991-09-01), Bennett
patent: 5105439 (1992-04-01), Bennett et al.
patent: 5163159 (1992-11-01), Rich et al.
patent: 5200978 (1993-04-01), Lo Curto et al.
patent: 5241562 (1993-08-01), Partyka et al.
"Indirect FM"--Simon Haykin--An Introduction to Analog and Digital Communications--1989 John Wiley & Sons Inc, pp. 339-344.
Cox Charles B.
Goud Paul A.
Hinkle Richard J.
Kroeger David W.
Linderer Timothy J.
Chin Stephen
Glenayre Electronics, Inc.
Le Amanda T.
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