Signalling transition control in a modulated-signal communicatio

Details Signalling transition control in a modulated-signal communicatio Signalling transition control in a modulated-signal communicatio

1992-04-17

1994-06-14

Harkcom, Gary V.

395138, 395142, 395143, 395133, G06F 1562

Patent

active

053217993

ABSTRACT:
A signal transition control system for use in a modulated-signal communication system having a plurality of predefined signal states each representing a digital data symbol, enables a transition from one signal state to a next signal state to be executed in a smooth, bandwidth-efficient manner. The system includes circuitry for receiving a stream of data symbols and storing in succession consecutive pairs of the data symbols, each of the pairs including a last data symbol and a next data symbol, for producing data describing a vector in signal space from the last data symbol to the next data symbol, for storing data representative of a desired shape of a transition from the last data symbol to the next data symbol, means for sequentially stepping through the data representative of the desired shape, and for producing data representing a transition from the last data symbol to the next data symbol, the transition having the desired shape. The system is used to particular advantage in a number-controlled modulated oscillator that generates a signal having a numerically controlled frequency, a numerically controlled phase, a programmable shape, and a numerically controlled amplitude.

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