Digital filter bank

Details Digital filter bank Digital filter bank

1977-07-11

1978-12-26

Claffy, Kathleen H.

Boots, shoes, and leggings

364726, H04J 100

Patent

active

041317661

ABSTRACT:
Disclosed is a digital filter for modulating and demodulating in frequency division multiplexing systems. For modulating a number of voice channels, a Fourier transform processor computes the discrete Fourier transform of a first series of data samples representative of the number of voice channels in time division multiplex format. A weighting network weights the transformed samples with predetermined weighting coefficients to form a frequency division multiplexed signal with proper passband characteristics. For demodulating a frequency division multiplexed signal the weighting network weights the samples with predetermined weighting coefficients and the Fourier transform processor computes a discrete Fourier transform of the weighted samples to form a time division multiplexed signal representative of the number of voice channels.

REFERENCES:
patent: 3605019 (1971-09-01), Cutter
patent: 3891803 (1975-06-01), Daguet
patent: 3971922 (1976-07-01), Bellanger

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