Equalizing signal combiner
First Claim
1. An equalizing signal combiner comprising:
- first and second signal paths (10,
11);
signal combining means (21,
22) coupled (19,
20) to said two wavepaths (10,
11) for combining the signals therein;
means (23) for phase modulating the signal in one of said signal paths to produce a fundamental component of amplitude variation in the combined signal;
signal processing means (25) for sensing said fundamental signal components in two selected portions (Δ
1, Δ
2) of the frequency spectrum of said combined signal;
and means (17) for varying the relative phase of the signals in said two wavepaths in response to the fundamental component of the weaker of said two signal components so as to minimize the amplitude dispersion of the combined signal within said frequency spectrum.
1 Assignment
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Accused Products
Abstract
In a space diversity receiver, the relative phase of the two received signals is varied in manner to minimize amplitude dispersion in the combined signal. A phase control signal is derived from the combined signal by phase modulating one of the received signals, and then detecting the fundamental amplitude component induced by said modulation within two selected portions of the combined signal spectrum. The fundamental component of the envelope modulation of the weaker of the two signal portions is used to control the relative phase of the two received signals so as to minimize the amplitude dispersion in the combined signal across the band. In the absence of inband phase dispersion needed in order for the compensating phase shift to effect the two signal portions differently, a relative delay is introduced in one of the two received signal paths.
22 Citations
5 Claims
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1. An equalizing signal combiner comprising:
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first and second signal paths (10,
11);signal combining means (21,
22) coupled (19,
20) to said two wavepaths (10,
11) for combining the signals therein;means (23) for phase modulating the signal in one of said signal paths to produce a fundamental component of amplitude variation in the combined signal; signal processing means (25) for sensing said fundamental signal components in two selected portions (Δ
1, Δ
2) of the frequency spectrum of said combined signal;and means (17) for varying the relative phase of the signals in said two wavepaths in response to the fundamental component of the weaker of said two signal components so as to minimize the amplitude dispersion of the combined signal within said frequency spectrum. - View Dependent Claims (2, 3, 4, 5)
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Specification