Frequency band compression of FDM using time expansion

Details Frequency band compression of FDM using time expansion Frequency band compression of FDM using time expansion

1977-10-31

1979-04-10

Claffy, Kathleen H.

179 1555T, 179 15BW, G10L 106, H04J 102

Patent

active

041490398

ABSTRACT:
A frequency band compression method, using Time Compression, for use with a frequency division multiplex (FDM) signal carrying voice signal. On the transmission end, the multiplexed signal is divided into a plurality of time segments, each segment having a certain duration, then deleting a part of the each segment and time-expanding the remaining part of the segment by a sawtooth variable delay, thus lowering the frequency of the signal to a predetermined ratio. On the receive end, the signal segments are compressed by a corresponding variable delay, thus making the received frequency higher and reproducing the original multiplexed voice signals.

REFERENCES:
patent: 3786195 (1974-01-01), Shiffman
F. Lee, "Time Compression and Expansion of Speech by Sampling Method,", J. of AES, Nov. 1972, pp. 738-742.

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