Digital filter bank
US4131766A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jul 11, 1977 |
| Grant date | Dec 26, 1978 |
| Priority date | — |
| Expiry date | Jul 11, 1997 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04J4/005
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.