1980-11-21
1982-10-26
Kemeny, Emanuel S.
H04B 166
Patent
active
043563538
ABSTRACT:
The present invention relates to a time compandor (40) including a cascaded pair of chirp transformers (41,42) of chirp rates .beta. and .sigma., respectively, capable of companding a continuous time signal x(t) to form a companded and delayed output signal x(a[t-.tau.]). Each chirp transformer includes a pi-network arrangement of linear dispersive filters (44,45,46,47,48,49), wherein the first chirp transformer (41) performs a Fourier transform on a continuous time input signal x(t) to produce X(.beta.t) and the second chirp transformer (42) performs an inverse Fourier transform on the product of the output of the first chirp transformer and a signal associated with the desired time delay .tau., to form the desired companded output signal x(.sigma./.beta.[t-.tau.]), where .sigma./.beta.=.alpha. is the desired companding rate, and .tau. is the desired time delay.
REFERENCES:
patent: 3697682 (1972-10-01), Berg
patent: 3920974 (1975-11-01), Means
patent: 4049958 (1977-09-01), Hartmann
patent: 4300161 (1981-11-01), Haskell
Morgen et al., "Time Compression Multiplexing . . . ", IEEE Trans. on Comm., Dec. 1974, pp. 1932-1939.
Gerard et al., "The Design and Applications of Highly Dispersive Surface Wave Filters", IEEE Trans. Microwave, Apr. 1973.
Flood et al., "Time Compression Multiplex Transmission", Proc. IEE, Apr. 1964, pp. 647-668.
Morgen, "Time Compression Multiplexing . . . ", Ph.D Dissertation, Columbia U., 1974.
Eng Kai Y.
Yue On-Ching
Bell Telephone Laboratories Incorporated
Kemeny Emanuel S.
Pfeifle Erwin W.
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