Title: Digital filter bank

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.

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Inventors: Narasimha, Madihally J. (Mountain View, CA, US)

Application Number: 814303
Filing Date: 1977-07-11
Publication_date: 1978-12-26
Assignee: Granger Associates (Menlo Park, CA)
Primary Class(es): 370/484 708/404, 708/406
Other Classes:
US Patent Ref:

3605019	Sep, 1971	Cutter	179/15.
3891803	Jun, 1975	Daguet	179/15.
3971922	Jul, 1976	Bellanger	179/15.

Other Refs:
Primary Examiner: Claffy, Kathleen H.
Assistant Examiner: Popek, Joseph A.
Attorney: Flehr, Hohbach, Test, Albritton & Herbert