Arrangement for combining data symbols in accordance with a predetermined weighting function

DETAILED DESCRIPTION In accordance with this invention the amplitude of data symbols are regulated in accordance with a segment of a predetermined weighting function and continuations in time of these original data symbols, referred to as extended data symbols, are regulated in accordance with another segment of the predetermined weighting function.
By thus separately processing the original and extended portions of the overall data symbol, only one source of data symbols is required irrespective of the number of symbol periods over which the data symbol is introduced to an output signal path.
It is a feature of this invention that a transversal filter adapted to accept original data symbols, including multipliers located at taps along a delay line, is used in forming extended data symbols and in regulating the amplitude of original and extended data symbols.
In accordance with a specific embodiment of this invention, a single source of abruptly modulated PSK signals of T seconds duration is used to supply original data symbols.
So that data symbols may be introduced to an output signal path over a duration of a plurality of symbol periods, means are provided for generating extended data symbols.
An overall data symbol is formed from portions comprising an original data symbol and an extended data symbol.
The predetermined weighting function is also divided into two segments, each having a duration equal to the duration of a corresponding portion of the overall data symbol and multiplied therewith.
The products of the amplifiers are then added together.
The foregoing and other objects and features of this invention will be more fully understood from the following description of illustrative embodiments taken in conjunction with the accompanying drawings.