DE4234491C1 - Digital filter bank - Google Patents
Digital filter bankInfo
- Publication number
- DE4234491C1 DE4234491C1 DE19924234491 DE4234491A DE4234491C1 DE 4234491 C1 DE4234491 C1 DE 4234491C1 DE 19924234491 DE19924234491 DE 19924234491 DE 4234491 A DE4234491 A DE 4234491A DE 4234491 C1 DE4234491 C1 DE 4234491C1
- Authority
- DE
- Germany
- Prior art keywords
- hmm
- real
- cell
- imaginary parts
- cells
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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
- H03H17/0266—Filter banks
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J1/00—Frequency-division multiplex systems
- H04J1/02—Details
- H04J1/04—Frequency-transposition arrangements
- H04J1/05—Frequency-transposition arrangements using digital techniques
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Electromagnetism (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Computer Hardware Design (AREA)
- Mathematical Physics (AREA)
- Radio Relay Systems (AREA)
Abstract
Description
Die Erfindung bezieht sich auf einen De-/Multiplexer von Frequenzbändern gemäß Oberbegriff des Patentanspruchs 1.The invention relates to a de / multiplexer of frequency bands according to the preamble of claim 1.
Solche Schaltungen sind bekannt, beispielsweise durch die Deutsche Patentschrift 37 32 085 beziehungsweise durch die Deutsche Patentschrift 36 10 195.Such circuits are known, for example from German Patent 37 32 085 or by German patent 36 10 195.
Digitale De-/Multiplexerschaltungen können je nach Anforderung an die Filtercharakteristik bei hohem Filtergrad und je nach Wortbreite des zu übertragenden Signals eine sehr umfangreiche Komplexität erreichen, welche sich in Chipflächenbedarf und Leistungsaufnahme des Chips ausdrücken. Insbesondere bei Einsatz nach der Hierarchischen Multistufen Methode (HMM) kann eine große ASIC-Fläche zustand kommen, die einen Leistungsbedarf hat, der insbesondere bei Satellitennutzlasten unerwünscht ist.Depending on the requirements of the digital de / multiplexer circuits Filter characteristics with a high degree of filtering and depending on Word width of the signal to be transmitted is a very reach extensive complexity, which is in Chip area requirement and power consumption of the chip express. Especially when used according to the hierarchical multi-level method (HMM) a large ASIC area can arise, which Has power requirements, especially at Satellite payloads is undesirable.
Der vorliegenden Erfindung lag die Aufgabe zugrunde, eine digitale Filterbank der eingangs genannten Art anzugeben, welche weniger und damit weniger Fläche und weniger HMM-Zellen Leistung benötigt, die gestellten Forderungen jedoch ebenfalls erfüllen.The present invention was based on the object specify digital filter bank of the type mentioned at the beginning, which has less and therefore less area and fewer HMM cells Performance is required, but so are the demands fulfill.
Diese Aufgabe wurde gelöst mit den Mitteln des Anspruches 1. Eine vorteilhafte Ausgestaltung ergibt sich durch den Unteranspruch. This object was achieved with the means of claim 1. An advantageous embodiment results from the Subclaim.
Durch den erfindungsgemäßen De-/Multiplexer ergeben sich die Vorteile eines wesentlich geringeren Gatterbedarfs, welcher eine geringere Chipfläche und eine niedrigere Leistungsaufnahme nach sich zieht.The de / multiplexer according to the invention results the advantages of a significantly lower gate requirement, which has a smaller chip area and a lower one Power consumption entails.
Die deutsche Patentschrift DE 41 16 495 betrifft einen Demultiplexer zum frequenzmäßigen Trennen eines Frequenzmultiplexsignals, wobei gewisse Teilfilterblöcke sowohl vom Realteil als auch vom Imaginärteil eines komplexwertigen Eingangssignals durchlaufen werden, eine echte komplette Doppeltausnutzung zur Ermittlung von Realteil und Imaginärteil eines komplexen Filterausgangssignals ist hier jedoch nicht erkennbar.The German patent DE 41 16 495 relates to one Demultiplexer for frequency separation of a Frequency division multiplex signal, with certain sub-filter blocks both of the real part and the imaginary part of one complex value input signal are run through, a real complete double utilization for the determination of Real part and imaginary part of a complex However, the filter output signal is not recognizable here.
Gemäß Anspruch 1 werden die Zellen im Zeitmultiplex betrieben werden.According to claim 1 the cells in time division multiplex operate.
Die Erfindung wird nun anhand der Figuren näher erläutert.The invention will now be explained in more detail with reference to the figures.
Die Fig. 1 zeigt einen digitalen Filterbaum nach dem Stande der Technik, wie er z. B. in der DE 37 32 085 A1 beschrieben ist, wobei in jeder Filterbaumstufe die Abtastrate halbiert wird und die Anzahl der Teilspektren verdoppelt wird. Von der Spitze aus gesehen verdoppelt sich also bei diesem digitalen Filterbaum mit jeder weiteren Stufe die Anzahl der eingesetzten Filterbänke und der HMM- Filterzellen. Fig. 1 shows a digital filter tree according to the prior art, as z. B. is described in DE 37 32 085 A1, the sampling rate being halved in each filter tree level and the number of sub-spectra being doubled. From the top, this digital filter tree doubles the number of filter banks and HMM filter cells used with each additional level.
In Fig. 2 ist eine Filterbank im Blockschaltbild nach dem Stande der Technik wiedergegeben, s. International Journal of Satellite Communications, Vol. 8, 1990, S. 79-93.In Fig. 2, a filter bank is shown in the block diagram according to the prior art, s. International Journal of Satellite Communications, Vol. 8, 1990, pp. 79-93.
Die Fig. 3 und 4 zeigen die erfindungsgemäße Ausführung des De-/Multiplexers für die Stufe 1. FIGS. 3 and 4 show the embodiment of the invention de- / multiplexer for level 1.
Claims (2)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19924234491 DE4234491C1 (en) | 1992-10-12 | 1992-10-12 | Digital filter bank |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19924234491 DE4234491C1 (en) | 1992-10-12 | 1992-10-12 | Digital filter bank |
Publications (1)
Publication Number | Publication Date |
---|---|
DE4234491C1 true DE4234491C1 (en) | 1994-12-22 |
Family
ID=6470355
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE19924234491 Expired - Fee Related DE4234491C1 (en) | 1992-10-12 | 1992-10-12 | Digital filter bank |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE4234491C1 (en) |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3610195A1 (en) * | 1986-03-26 | 1987-10-01 | Ant Nachrichtentech | DIGITAL FILTER BANK |
DE3732085A1 (en) * | 1986-03-26 | 1989-04-06 | Ant Nachrichtentech | DIGITAL FILTER TREE |
DE3837841C1 (en) * | 1988-10-22 | 1990-02-15 | Ant Nachrichtentechnik Gmbh, 7150 Backnang, De | Filter bank for the frequency-division multiplexing or frequency-division demultiplexing of channel signals |
DE4116495C1 (en) * | 1991-05-21 | 1992-06-17 | Ant Nachrichtentechnik Gmbh, 7150 Backnang, De | Multiplexer-demultiplexer for synthesising or analysing frequency multiplex signals in multi-carrier system - has common filter block and real and imaginary part blocks for inverse discrete fast Fourier transformation |
-
1992
- 1992-10-12 DE DE19924234491 patent/DE4234491C1/en not_active Expired - Fee Related
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3610195A1 (en) * | 1986-03-26 | 1987-10-01 | Ant Nachrichtentech | DIGITAL FILTER BANK |
DE3732085A1 (en) * | 1986-03-26 | 1989-04-06 | Ant Nachrichtentech | DIGITAL FILTER TREE |
DE3837841C1 (en) * | 1988-10-22 | 1990-02-15 | Ant Nachrichtentechnik Gmbh, 7150 Backnang, De | Filter bank for the frequency-division multiplexing or frequency-division demultiplexing of channel signals |
DE4116495C1 (en) * | 1991-05-21 | 1992-06-17 | Ant Nachrichtentechnik Gmbh, 7150 Backnang, De | Multiplexer-demultiplexer for synthesising or analysing frequency multiplex signals in multi-carrier system - has common filter block and real and imaginary part blocks for inverse discrete fast Fourier transformation |
Non-Patent Citations (1)
Title |
---|
International Journal of Satellite Communica- tions, Vol.8, 1990, S.79-93 * |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
8100 | Publication of the examined application without publication of unexamined application | ||
D1 | Grant (no unexamined application published) patent law 81 | ||
8364 | No opposition during term of opposition | ||
8327 | Change in the person/name/address of the patent owner |
Owner name: ROBERT BOSCH GMBH, 70469 STUTTGART, DE |
|
8339 | Ceased/non-payment of the annual fee |