NO894274L - Filterbank for frekvensmultipleksing hhv. frekvensdemulipleksing av kanalsignaler. - Google Patents
Filterbank for frekvensmultipleksing hhv. frekvensdemulipleksing av kanalsignaler.Info
- Publication number
- NO894274L NO894274L NO89894274A NO894274A NO894274L NO 894274 L NO894274 L NO 894274L NO 89894274 A NO89894274 A NO 89894274A NO 894274 A NO894274 A NO 894274A NO 894274 L NO894274 L NO 894274L
- Authority
- NO
- Norway
- Prior art keywords
- filter
- frequency
- filters
- cascade
- channel signals
- Prior art date
Links
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H17/00—Networks using digital techniques
- H03H17/02—Frequency selective networks
- H03H17/0248—Filters characterised by a particular frequency response or filtering method
- H03H17/0264—Filter sets with mutual related characteristics
- H03H17/0273—Polyphase filters
- H03H17/0275—Polyphase filters comprising non-recursive filters
- H03H17/0276—Polyphase filters comprising non-recursive filters having two phases
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H17/00—Networks using digital techniques
- H03H17/02—Frequency selective networks
- H03H17/0248—Filters characterised by a particular frequency response or filtering method
- H03H17/0264—Filter sets with mutual related characteristics
- H03H17/0266—Filter banks
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H17/00—Networks using digital techniques
- H03H17/02—Frequency selective networks
- H03H17/06—Non-recursive filters
- H03H17/0621—Non-recursive filters with input-sampling frequency and output-delivery frequency which differ, e.g. extrapolation; Anti-aliasing
- H03H17/0635—Non-recursive filters with input-sampling frequency and output-delivery frequency which differ, e.g. extrapolation; Anti-aliasing characterized by the ratio between the input-sampling and output-delivery frequencies
- H03H17/065—Non-recursive filters with input-sampling frequency and output-delivery frequency which differ, e.g. extrapolation; Anti-aliasing characterized by the ratio between the input-sampling and output-delivery frequencies the ratio being integer
- H03H17/0657—Non-recursive filters with input-sampling frequency and output-delivery frequency which differ, e.g. extrapolation; Anti-aliasing characterized by the ratio between the input-sampling and output-delivery frequencies the ratio being integer where the output-delivery frequency is higher than the input sampling frequency, i.e. interpolation
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H17/00—Networks using digital techniques
- H03H17/02—Frequency selective networks
- H03H17/06—Non-recursive filters
- H03H17/0621—Non-recursive filters with input-sampling frequency and output-delivery frequency which differ, e.g. extrapolation; Anti-aliasing
- H03H17/0635—Non-recursive filters with input-sampling frequency and output-delivery frequency which differ, e.g. extrapolation; Anti-aliasing characterized by the ratio between the input-sampling and output-delivery frequencies
- H03H17/065—Non-recursive filters with input-sampling frequency and output-delivery frequency which differ, e.g. extrapolation; Anti-aliasing characterized by the ratio between the input-sampling and output-delivery frequencies the ratio being integer
- H03H17/0664—Non-recursive filters with input-sampling frequency and output-delivery frequency which differ, e.g. extrapolation; Anti-aliasing characterized by the ratio between the input-sampling and output-delivery frequencies the ratio being integer where the output-delivery frequency is lower than the input sampling frequency, i.e. decimation
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J4/00—Combined time-division and frequency-division multiplex systems
- H04J4/005—Transmultiplexing
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H2218/00—Indexing scheme relating to details of digital filters
- H03H2218/04—In-phase and quadrature [I/Q] signals
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Computer Hardware Design (AREA)
- Mathematical Physics (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Time-Division Multiplex Systems (AREA)
- Radio Relay Systems (AREA)
- Complex Calculations (AREA)
Abstract
Filterbank for frekvensmultiplek- sing hhv. frekvensdernultipleksing av kanalsignaler med transversalfiltre, med redusert hhv. øket samplingstakt, idet de L filtre er realisert ved hjelp av en kaskade, og idet det mellom de i enkelte filterkaskader er innkoplet en kompleks multipliserer, og som er i kjennetegnet ved at multiplisereren er sammenfattet med filteret i det forangående hhv. etterfølgende kaskade- I trinn. Anvendelsen av sådanne filter- : banker skjer hovedsakelig i transmulti- i pleksere for omforming av FDM til TDM hhv. omvendt, hovedsakelig innen satel-' litteknikken. Formålet med oppfinnelsen er å redusere den nødvendige regne- ytelse. Ved hjelp av sammenfatningen i av den komplekse multipliserer med i det tilgrensende filter oppstår riktig- nok et tidsvariant filter, men filtrene i de andre kaskadetrinn er som for tidsinvariante og inneholder reelle koeffisienter. Totalt sett fremkommer en mindre regneytelse, idet antallet av koeffisienter som skal lagres, øker bare i uvesentlig grad.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19883837841 DE3837841C1 (en) | 1988-10-22 | 1988-11-08 | Filter bank for the frequency-division multiplexing or frequency-division demultiplexing of channel signals |
Publications (2)
Publication Number | Publication Date |
---|---|
NO894274D0 NO894274D0 (no) | 1989-10-26 |
NO894274L true NO894274L (no) | 1990-05-09 |
Family
ID=6366709
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
NO89894274A NO894274L (no) | 1988-11-08 | 1989-10-26 | Filterbank for frekvensmultipleksing hhv. frekvensdemulipleksing av kanalsignaler. |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP0367932B1 (no) |
NO (1) | NO894274L (no) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2759514B1 (fr) * | 1997-02-10 | 1999-03-05 | Alsthom Cge Alcatel | Dispositif et procede numeriques de filtrage, decimation et transposition en bande de base repartie, et demodulateur numerique correspondant |
FR2815211A1 (fr) * | 2000-10-11 | 2002-04-12 | Satellite Terminal Access | Dispositif de filtrage a reponse impulsionnelle finie a coefficients periodiques |
US6961395B2 (en) * | 2001-11-16 | 2005-11-01 | Nortel Networks Limited | Time variant filter implementation |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4412325A (en) * | 1981-07-13 | 1983-10-25 | Telettra- Telefonia Elettronica E Radio S.P.A. | Equipment for single band multiplexing through digital processing |
DE8706928U1 (de) * | 1987-05-14 | 1987-08-06 | ANT Nachrichtentechnik GmbH, 7150 Backnang | Filterbank |
-
1989
- 1989-09-01 EP EP19890116171 patent/EP0367932B1/de not_active Expired - Lifetime
- 1989-10-26 NO NO89894274A patent/NO894274L/no unknown
Also Published As
Publication number | Publication date |
---|---|
EP0367932B1 (de) | 1994-08-24 |
NO894274D0 (no) | 1989-10-26 |
EP0367932A3 (de) | 1991-10-09 |
EP0367932A2 (de) | 1990-05-16 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
Galand et al. | New quadrature mirror filter structures | |
Cox | The design of uniformly and nonuniformly spaced pseudoquadrature mirror filters | |
Swaminathan et al. | Theory and design of uniform DFT, parallel, quadrature mirror filter banks | |
Darlington | On digital single-sideband modulators | |
DK3244638T3 (da) | Advanceret behandling baseret på en moduleret filterbank med kompleks eksponentialfunktion | |
ATE86415T1 (de) | Digitale polyphasen-filterbank mit maximaler taktreduktion. | |
DK1529282T3 (da) | Fremgangsmåde og anlæg til behandling af underbåndssignaler under anvendelse af adaptive filtre | |
Nussbaumer et al. | Computationally efficient QMF filter banks | |
US4412325A (en) | Equipment for single band multiplexing through digital processing | |
Liu et al. | Simple design of oversampled uniform DFT filter banks with applications to subband acoustic echo cancellation | |
ES479955A1 (es) | Dispositivo analizador numerico de espectro de una senal. | |
JPS55164700U (no) | ||
NO894274L (no) | Filterbank for frekvensmultipleksing hhv. frekvensdemulipleksing av kanalsignaler. | |
GB2022954A (en) | Transversal filters | |
Wang | Instantaneous and frequency-warped signal processing techniques for auditory source separation | |
Rosenbaum et al. | An Approach for Synthesis of Modulated-Channel FIR Filter Banks Utilizing the Frequency-Response Masking Technique | |
DK0608281T3 (da) | Fremgangsmåde til reduktion af frekvenskrydstale ved overførsel og/eller lagring af akustiske eller optiske signaler | |
DE3782882D1 (de) | Filteranordnung. | |
Nelson et al. | Linear distribution of signals | |
ISEKI | A proof of a transformation formula in the theory of partitions | |
JP3391144B2 (ja) | 帯域分割型エコーキャンセラー | |
Mosetti et al. | Some methods of tidal analysis | |
WO2000051015A9 (en) | An adaptive filtering system and method for cancelling echoes and reducing noise in digital signals | |
Ashihara et al. | Improvement of convergence speed for subband adaptive digital filters using the multirate repeating method | |
Gannot et al. | Beamforming methods for multi-channel speech enhancement |