Methods and apparatus for bandwidth reduction

Details Methods and apparatus for bandwidth reduction Methods and apparatus for bandwidth reduction

1981-12-02

1985-06-04

Kemeny, Emanuel S.

Pulse or digital communications

Spread spectrum

Direct sequence

381 29, G10L 100

Patent

active

045216460

ABSTRACT:
Bandwidth reduction by simple spectrum folding (i.e., adding the reversed-spectrum signal to the original signal) causes spectrum ambiguties and cancellations which are avoided by encoding, i.e., first "earmarking" the original signal by adding to the original signal its squared signal, then angle-modulating the reversed-spectrum earmarked-signal before adding it to the earmarked signal. Bandwidth expansion for signal reconstruction involves decoders which use the encoder in a feedback loop.

REFERENCES:
patent: 2939918 (1960-06-01), Freedman
patent: 3914554 (1975-10-01), Seidel
Tsuruoka, "New Narrow Band Telephone . . . ", Jaeu, No. 2, (71), vol. 4, pp. 18-22.

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