Process and a system for digital modulation

US5473633A · kind A · utility

Assignee

• Deutsche Aerospace AG · DE

Inventors

• Horst Fischer · Hilden, DE
• Helmut Bittner · Munich, DE

Key dates

• Filing date: Apr 2, 1993
• Grant date: Dec 5, 1995
• Expiry date: Apr 2, 2013

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B64G1/26
• WIPO field: Transport
• WIPO sector: Mechanical engineering

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.