Process and a system for digital modulation

Details Process and a system for digital modulation Process and a system for digital modulation

1993-04-02

1995-12-05

Chin, Stephen

Pulse or digital communications

Pulse width modulation

375295, 375239, 327 31, 332109, 332112, 370 8, 370 9, H03K 708, H03K 908

Patent

active

054736331

ABSTRACT:
A digital modulation process and apparatus for converting an input signal comprising a time variable series of sampling values, each of which sampling values remains constant within a fixed sampling period, into output signals representing a sequence of positive and/or negative pulses having a constant amplitude and a variable pulse width and frequency. The input signal and modulator parameters are supplied to a data processor. In order to reduce computing expenditures and at the same time achieve an increase in precision, by means of the computing system, the switch-on and switch-off points in time t.sub.se, t.sub.sa of the pulses as well as their operational signs are computed in one operation directly for each sampling period .DELTA.t.sub.k.

REFERENCES:
patent: 4001728 (1977-01-01), Schneider
patent: 4138632 (1979-02-01), Pauwels et al.
patent: 4646321 (1987-02-01), Berlinsky
patent: 5042752 (1991-08-01), Surauer et al.

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