EP1390947B1 - Procede pour la reception de signaux - Google Patents

Procede pour la reception de signaux Download PDF

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Publication number
EP1390947B1
EP1390947B1 EP02737822A EP02737822A EP1390947B1 EP 1390947 B1 EP1390947 B1 EP 1390947B1 EP 02737822 A EP02737822 A EP 02737822A EP 02737822 A EP02737822 A EP 02737822A EP 1390947 B1 EP1390947 B1 EP 1390947B1
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EP
European Patent Office
Prior art keywords
background signal
lpc
bandwidth
characteristic data
filter coefficients
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
Application number
EP02737822A
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German (de)
English (en)
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EP1390947A2 (fr
Inventor
Tim Fingscheidt
Imre Varga
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Siemens AG
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Siemens AG
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    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10L—SPEECH ANALYSIS TECHNIQUES OR SPEECH SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING TECHNIQUES; SPEECH OR AUDIO CODING OR DECODING
    • G10L19/00—Speech or audio signals analysis-synthesis techniques for redundancy reduction, e.g. in vocoders; Coding or decoding of speech or audio signals, using source filter models or psychoacoustic analysis
    • G10L19/012—Comfort noise or silence coding
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10L—SPEECH ANALYSIS TECHNIQUES OR SPEECH SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING TECHNIQUES; SPEECH OR AUDIO CODING OR DECODING
    • G10L21/00—Speech or voice signal processing techniques to produce another audible or non-audible signal, e.g. visual or tactile, in order to modify its quality or its intelligibility
    • G10L21/02—Speech enhancement, e.g. noise reduction or echo cancellation
    • G10L21/038—Speech enhancement, e.g. noise reduction or echo cancellation using band spreading techniques

Definitions

  • the invention relates to a method for signal reception in one digital communication system using a background signal generator from received characteristic data, which one Characterize transmitter-side background signal, an output background signal is generated.
  • a method for voice transmission in digital communication systems in which to transmit a Background signal at least in the speech pauses with one such a method is used, as well as a corresponding Background signal generator with which such Procedure can be carried out.
  • DTX discontinuous transmission
  • VAD Voice Activity Detector
  • a speech decoder recognizes whether it is a speech frame or a background signal frame.
  • a background signal frame then becomes the following Number of missing frames replaced again by simply the received frame is repeated in the appropriate number becomes.
  • This is usually done in a background signal generator, for example the so-called CNG (Comfort Noise Generator), which is located next to a core speech decoder, which performs the decoding of the speech frames in the Speech decoder is located.
  • CNG Computer Noise Generator
  • the transfer of only part of the Frame during a background noise has the advantage that during this time the transmission channel for further calls other participants or for the transmission of others Data can be used.
  • the completion of the missing Information about the background noise in the CNG is provided therefore, to give each listener the feeling of continuous To convey transmission so that it does not irritate is feared and an interruption of the connection.
  • narrowband transmission narrowband
  • WB wide band
  • the bandwidth for narrowband transmission is, for example, 300 to 3400 Hz, which corresponds to a sampling rate (sample frequency) of 8 kHz. This is a transmission in the usual telephone quality.
  • Broadband coding achieves better transmission quality. This is, for example, in the range from 50 to 7000 Hz, corresponding to a sampling rate of 16 kHz. This standard is already being used in part in the current fixed telephone networks for video conferences etc.
  • broadband encoder technologies are to be developed and standardized in the future, for example various technologies with 16, 24 or 32 kbit / s bit rate for the ITU-T system.
  • a wideband AMR coder is provided, a narrowband AMR coder is already specified.
  • AMR Adaptive Multi Rate
  • the ratio between the bit rate of the speech encoder and the channel encoder is varied on the transmitter side depending on the channel quality.
  • the sum of the bit rate is selected depending on the traffic and the available capacity on the transmission channels and then kept constant.
  • a distinction is made here e.g. B. between full rate and half rate channels.
  • the AMR-WB speech decoder and the AMR-NB speech decoder are implemented on the receiver side, then it is provided there that according to the transmission between a narrowband and a broadband mode, ie the AMR-NB speech decoder and the AMR-WB- Voice decoder is switched. If necessary, such a switchover can also occur during a call. When switching from broadband to narrowband mode, the user usually perceives a significant loss in quality.
  • NB speech decoder narrow-band speech decoder
  • wideband extender the entire signal within a so-called wideband extender towards the larger bandwidth expand.
  • this can be done by any method known in the literature for artificial bandwidth expansion, which also generates signal components at frequencies which were not present in the narrowband signal or only in an attenuated manner.
  • Such an artificial bandwidth expansion is particularly useful if it is a system with different bandwidths, for example with implementations of the AMR-NB and the AMR-WB method.
  • Figure 1 shows a corresponding device according to the current state of the art.
  • the core speech decoder (Core-SD) which the actual incoming speech signal frame S decoded and a CNG which receives the background signal frames H and a corresponding output background signal is generated.
  • Core SD core speech decoder
  • CNG CNG which receives the background signal frames H and a corresponding output background signal is generated.
  • WB extender WB extender abbreviated
  • a background signal generator is also intended to be used be specified in this procedure.
  • this is done within the background signal generator an output background signal from the received characteristic data with a given bandwidth, which is greater than the bandwidth of that received by Characteristics of the characterized background signal, i. H. it will already in the background signal generator from the characteristic data the narrowband background signal the broadband Background signal generated.
  • the process consequently at least for the part of the signal that is in the background signal generator, d. H. in a CNG constructed according to the invention, is processed, no downstream wideband extender needed. This will result in a significant number of circuit operations no longer needed during reception, which leads to the desired reduction in the total energy requirement leads.
  • a background signal generator Have means for generating the output signal, which are designed so that the bandwidth of the generated output background signal is larger than that Range of characteristics characterized by the input data Background signal.
  • Such an inventive Background signal generator is preferably part of a Speech decoder, which in any receiving device can be arranged. It is preferably the receiving device around a terminal. But it can also a receiving device within any one Communication network, for example a cellular network or a fixed telephone network.
  • the method or such a background signal generator can be used wherever a Output background signal generated from transmitted characteristic data will, d. h, in particular in the usually in cellular networks used methods for voice transmission, at which separate background signal frames in the speech pauses are transmitted, which are then in the receiver device within the CNG can be converted into an output background signal.
  • the inventive method or the background signal generator are not on the current narrowband and Broadband standards are limited but can always be applied when it comes down to a narrow band transmitted signal to generate a broadband signal.
  • the output background signal can either be according to Editing directly to a user of the device acoustic way as background noise.
  • the characteristic data can also be a gain factor which include the signal energy, i. H. the volume representing the background signal.
  • the transmission the spectral information based on the LPC filter coefficients as well as the additional transmission of a gain factor is the usual one in current standards Way to transmit characteristics for a background signal.
  • a preferred way of generating an output background signal with the desired larger bandwidth from the received LPC filter coefficients of a narrow band Filters consists of the received LPC filter coefficients into corresponding LPC filter coefficients for an LPC synthesis filter of the desired larger bandwidth convert and the converted LPC filter coefficients then feed it to an LPC synthesis filter that matches the noise signal the desired bandwidth is excited.
  • a background signal generator according to the invention is required on the one hand, either a noise signal generator for generation a corresponding noise signal or alternatively an input for such a noise signal.
  • these agents can be an LPC synthesis filter the desired bandwidth as well as Means to filter the LPC for a narrow band Filters as they appear in the input data are in corresponding LPC filter coefficients for the broadband Implement LPC synthesis filter.
  • a particularly easy way to use the LPC filter coefficients for the broadband LPC synthesis filter from the zu to determine the receiving LPC filter coefficient consists in the use of a look up table, in the "narrowband" LPC filter coefficient and "broadband" LPC filter coefficients are assigned to each other.
  • the LPC filter coefficients are mutually sentence by sentence assigned, d. H. there are complete LPC filter coefficient sets in the table saved and assigned to each other.
  • the assignment table can, for example, use a parallel Training determined using suitable estimation methods become.
  • the memory can be a memory within act of the CNG or the speech decoder. It can but also an external one, if necessary for other purposes anyway located within the receiving device or the device Act memory on which the speech decoder or CNG Has access.
  • the mapping table can be a single large Assignment table. But it can also be a multi-part Mapping table or by several individual mapping tables act.
  • a speech decoder (SD) 8 a CNG 1 and a narrow-band core speech decoder (Core SD) 7 are arranged.
  • the incoming signal includes each speech frame S and - in speech pauses - background signal frame H, the corresponding for each Voice decoders are recognizable.
  • the speech signal frames S are decoded within the core speech decoder 7 and therefrom a narrowband speech signal SS is generated, which in a subsequent wideband extender into a broadband Signal is implemented.
  • the difference of the invention Structure to the prior art consists in the structure of the Background signal generator 1, i.e. H. in the CNG 1.
  • a conventional narrow band CNG is used, which comes from an incoming background signal frame H generates a narrowband background signal.
  • a switch which corresponds to the activity of the core speech decoder and the CNG is switched put the signal on an output line of the speech decoder, so that on this output line a continuous narrowband signal is present, which is then the wideband extender is fed. That is, in this conventional method the output background signal is generated in narrowband and then in the wideband extender accordingly extensive switching operation converted into a broadband signal.
  • Output signal of the CNG also initially in the core speech decoder to be processed further, which in turn then outputs decoded background signal.
  • a broadband CNG 1 used which immediately from an incoming background signal frame H one narrowband background signal a broadband output background signal HS generated at the output.
  • This broadband Background signal HS no longer needs the wideband extender 10 to be fed. Accordingly, only that of Core speech decoder 7 outgoing signal SS the wideband extender 10 fed.
  • FIG 3 shows a particularly simple and inexpensive Embodiment for a CNG 1 according to the invention, which from the background signal frame H of a narrow band Background signal is a broadband output background signal HS generated.
  • the advantage of this CNG 1 is that that as an input signal normal, according to the current one Standard transmitted background signal frame H used can be. That is, a transmission of the currently is sufficient usual LPC filter coefficients, which the spectral information of the signal included, and the transmission of the gain VF, which represents the signal energy, out. Therefore, there are no changes to a transmission standard or something similar.
  • the background signal generator according to the invention is accordingly also very similar to a conventional background signal generator built and has an LPC synthesis filter 2, which one by means of the white noise RS Noise signal generator 6 is excited.
  • the volume of the signal is determined by the gain factor VF, which is set in an amplification device 5 the white noise signal present at the input of the LPC filter RS reinforced accordingly.
  • This gain factor becomes VF by means of an analysis device 4 from the incoming background signal frame determined.
  • LPC filter coefficients are initially in a conversion device 3 from the background signal frame H determined and in LPC filter coefficients FK the desired larger bandwidth. This conversion takes place, for example, with the help of one in one Memory 3a stored allocation table LUT.
  • LUT assignment table are the various LPC filter coefficient sets, which is the background signal of the broadcast Correspond to bandwidth, each LPC filter coefficient sets the desired bandwidth of the broadband output background signal HS assigned.
  • the bandwidth widening directly integrated into the CNG 1, creating a efficient method of increasing the bandwidth for the periods the language breaks are possible. Because the sum of the pauses in speech a fairly high proportion during an overall conversation can assume is overall of a considerably smaller Energy consumption of such a receiver.

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  • Engineering & Computer Science (AREA)
  • Computational Linguistics (AREA)
  • Signal Processing (AREA)
  • Health & Medical Sciences (AREA)
  • Audiology, Speech & Language Pathology (AREA)
  • Human Computer Interaction (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
  • Quality & Reliability (AREA)
  • Compression, Expansion, Code Conversion, And Decoders (AREA)
  • Dc Digital Transmission (AREA)

Claims (14)

  1. Procédé pour la réception de signaux dans un système de communication numérique dans lequel un signal d'arrière-plan de sortie (HS) est créé dans un générateur (1) de signaux d'arrière-plan à partir de données caractéristiques (H) reçues qui caractérisent un signal d'arrière-plan du côté de l'émetteur,
    caractérisé en ce que dans le générateur (1) de signaux d'arrière-plan, un signal d'arrière-plan de sortie (HS) d'une largeur de bande prédéterminée est créé à partir des données caractéristiques (H) reçues, cette largeur de bande étant plus grande que la largeur de bande du signal d'arrière-plan caractérisé par les données caractéristiques (H) reçues.
  2. Procédé selon la revendication 1,
    caractérisé en ce que le signal d'arrière-plan de sortie (HS) est créé dans le générateur (1) de signaux d'arrière-plan au moyen des données caractéristiques (H) reçues, à partir d'un signal de bruit (RS) qui présente la largeur de bande plus grande souhaitée.
  3. Procédé selon les revendications 1 ou 2,
    caractérisé en ce que les données caractéristiques comprennent des coefficients (FK) de filtrage LPC pour un filtre à synthèse LPC et/ou un facteur d'amplification (VF).
  4. Procédé selon la revendication 3,
    caractérisé en ce que des coefficients de filtrage LPC (FK) qui conviennent à un filtre (2) à synthèse LPC qui présente la largeur de bande plus grande souhaitée sont déterminés sur base des coefficients de filtrage LPC reçus, le signal de bruit (RS) qui présente la largeur de bande que l'on souhaite étant appliqué sur ce filtre.
  5. Procédé selon la revendication 4,
    caractérisé en ce que la détermination des coefficients (FK) de filtrage LPC pour le filtre à synthèse LPC à plus large bande s'effectue à partir des coefficients de filtrage LPC reçus, au moyen d'un tableau de correspondance (LUT) dans lequel des coefficients de filtrage LPC pour un filtre à synthèse LPC qui présente la largeur de bande du signal d'arrière-plan du côté de l'émetteur et des coefficients (FK) de filtrage LPC pour le filtre (2) à synthèse LPC et à plus large bande sont mis en correspondance mutuelle.
  6. Procédé de transmission de signaux dans des systèmes de communication numérique, dans lequel, pour la transmission d'un signal d'arrière-plan, des données caractéristiques (H) qui caractérisent le signal d'arrière-plan concerné sont transmises au moins pendant les pauses de conversation à un récepteur, un signal d'arrière-plan de sortie (HS) étant créé du côté du récepteur,
    caractérisé en ce que le signal d'arrière-plan de sortie (HS) est créé par un procédé selon l'une des revendications 1 à 5.
  7. Procédé selon l'une des revendications 1 à 6,
    caractérisé en ce que le système de communication numérique comprend un système de radiotéléphonie mobile.
  8. Générateur (1) de signaux d'arrière-plan doté de moyen (2, 3, 4, 5, 6) qui, à partir de données caractéristiques (H) présentes à l'entrée et qui caractérisent un signal d'arrière-plan du côté de l'émetteur, crée un signal d'arrière-plan de sortie (HS) correspondant,
    caractérisé en ce que les moyens (2, 3, 4, 5, 6) pour la création du signal d'arrière-plan de sortie (HS) sont configurés de telle sorte que la largeur de bande du signal d'arrière-plan de sortie (HS) créé est plus grande que la largeur de bande du signal d'arrière-plan caractérisé par les données caractéristiques (H) appliquées à l'entrée.
  9. Générateur de signaux d'arrière-plan selon la revendication 8,
    caractérisé par
    un générateur (6) de signaux de bruit pour la création d'un signal de bruit (RS) qui présente la largeur de bande plus grande souhaitée, et/ou par une entrée pour un tel signal de bruit ainsi que par des moyens (2, 3, 5) qui créent le signal d'arrière-plan de sortie (HS) à partir du signal de bruit (RS) au moyen des données caractéristiques (H) reçues.
  10. Générateur de signaux d'arrière-plan selon la revendication 9,
    caractérisé par
    un filtre (2) à synthèse LPC qui présente la largeur de bande que l'on souhaite et par des moyens (3) qui convertissent les coefficients de filtrage LPC contenus dans les données caractéristiques (H) appliquées à l'entrée en coefficients (FK) de filtrage LPC qui conviennent au filtre (2) à synthèse LPC.
  11. Générateur de signaux d'arrière-plan selon la revendication 10,
    caractérisé par
    une mémoire (3a) dotée d'un tableau de correspondance (LUT) dans lequel des coefficients de filtrage LPC qui présentent la largeur de bande du signal d'arrière-plan de l'émetteur et des coefficients (FK) de filtrage LPC pour le filtre (2) à synthèse LPC à plus large bande sont mis en correspondance mutuelle.
  12. Décodeur vocal (8) doté d'un générateur (1) de signaux d'arrière-plan selon l'une des revendications 8 à 11 qui précèdent.
  13. Dispositif de réception doté d'un générateur de signaux d'arrière-plan selon l'une des revendications 8 à 11 qui précèdent ou d'un décodeur vocal selon la revendication 12.
  14. Terminal doté d'un dispositif de réception selon la revendication 13.
EP02737822A 2001-05-17 2002-04-29 Procede pour la reception de signaux Expired - Fee Related EP1390947B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10124189 2001-05-17
DE10124189A DE10124189A1 (de) 2001-05-17 2001-05-17 Verfahren zum Signalempfang
PCT/DE2002/001560 WO2002093562A2 (fr) 2001-05-17 2002-04-29 Procede pour la reception de signaux

Publications (2)

Publication Number Publication Date
EP1390947A2 EP1390947A2 (fr) 2004-02-25
EP1390947B1 true EP1390947B1 (fr) 2004-10-06

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EP02737822A Expired - Fee Related EP1390947B1 (fr) 2001-05-17 2002-04-29 Procede pour la reception de signaux

Country Status (4)

Country Link
EP (1) EP1390947B1 (fr)
CN (1) CN1319045C (fr)
DE (2) DE10124189A1 (fr)
WO (1) WO2002093562A2 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7546237B2 (en) 2005-12-23 2009-06-09 Qnx Software Systems (Wavemakers), Inc. Bandwidth extension of narrowband speech

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE506034C2 (sv) * 1996-02-01 1997-11-03 Ericsson Telefon Ab L M Förfarande och anordning för förbättring av parametrar representerande brusigt tal
GB9714001D0 (en) * 1997-07-02 1997-09-10 Simoco Europ Limited Method and apparatus for speech enhancement in a speech communication system

Also Published As

Publication number Publication date
DE50201243D1 (de) 2004-11-11
CN1319045C (zh) 2007-05-30
WO2002093562A3 (fr) 2003-06-19
EP1390947A2 (fr) 2004-02-25
WO2002093562A2 (fr) 2002-11-21
DE10124189A1 (de) 2002-11-21
CN1636241A (zh) 2005-07-06

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