EP1677286A1 - Procédé pour l'adaptation de paramètres de génération de bruit de confort - Google Patents

Procédé pour l'adaptation de paramètres de génération de bruit de confort Download PDF

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Publication number
EP1677286A1
EP1677286A1 EP05111976A EP05111976A EP1677286A1 EP 1677286 A1 EP1677286 A1 EP 1677286A1 EP 05111976 A EP05111976 A EP 05111976A EP 05111976 A EP05111976 A EP 05111976A EP 1677286 A1 EP1677286 A1 EP 1677286A1
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EP
European Patent Office
Prior art keywords
cng
parameters
qrc
cnp
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.)
Withdrawn
Application number
EP05111976A
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German (de)
English (en)
Inventor
Nitin Arora
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nokia Solutions and Networks GmbH and Co KG
Original Assignee
Siemens AG
Nokia Siemens Networks GmbH and Co KG
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Publication date
Application filed by Siemens AG, Nokia Siemens Networks GmbH and Co KG filed Critical Siemens AG
Publication of EP1677286A1 publication Critical patent/EP1677286A1/fr
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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

Definitions

  • the present invention relates to a method for adapting comfort noise generation (CNG) parameters provided for generating a background noise signal in a telecommunication system consisting of a packet-oriented telecommunication network and at least one first and second communication device connected thereto.
  • CNG comfort noise generation
  • the CNG parameters are generated in the first communication device and inserted into at least one Silence Insertion Descriptor (SID) transmission frame over the packet-oriented telecommunications network to the second communication device.
  • SID Silence Insertion Descriptor
  • IP Voice Over Internet Protocol
  • CDMA Code Division Multiple Access
  • the receiving unit uses the CNG parameters to create an artificial, pleasant noise (“Comfort Noise Generation”), using many different techniques to produce CNG parameters and then recover the background noise (“comfort noise generation”) which implement both predefined and at least partially standardized protocols for the exchange of CNG parameters both in the receiving unit and in the transmitting unit.
  • SID Session Insertion Descriptor
  • CNG Comfort Noise Generation
  • a non-binding definition of such CNG parameters with regard to the transmission frame to be used or the "comfort noise payload" transmitted in a data packet is provided in standard G.711 Appendix II of the ITU Telecommunication Standardization Section (ITU-T), which already stipulates that the "comfort noise payload" may include a parameter indicative of the noise signal level and a plurality of parameters indicative of background noise spectral characteristics in the form of filter coefficients.
  • the essential advantage of the method according to the invention can be seen in that the transmitted CNG parameters are compared with a predetermined CNG parameter format and thereby adapted to the predetermined CNG parameter format in the event of deviation from the predetermined CNG parameter format which removes individual CNG parameters and / or replaces faulty, missing, or incompatible CNG parameters with predetermined target CNG parameters.
  • the transmitted CNG parameters are compared with a predetermined CNG parameter format and thereby adapted to the predetermined CNG parameter format in the event of deviation from the predetermined CNG parameter format which removes individual CNG parameters and / or replaces faulty, missing, or incompatible CNG parameters with predetermined target CNG parameters.
  • the predetermined CNG parameter format limits the number of transmitted CNG parameters to a maximum of 11 parameters including a QEL parameter and 10 QRC coefficients.
  • the limitation of the number of parameters to a maximum of 11 parameters, of which 10 are formed as spectral parameters, allows the use of commercially available filter units and reduces both the hardware implementation costs and the computational effort within the telecommunications system.
  • a telecommunication system 1 in particular a packet-oriented telecommunication system, is shown by way of a schematic structure diagram, which has a first communication device 2 and a second communication device 3, which are interconnected, for example, via a packet-oriented or IP-oriented communication network 4 ,
  • the data transmission via the IP-oriented communication network 4 takes place here by means of data packets.
  • the first and second communication device 2, 3 may be configured as gateway computer systems that are of different technical structure and to which, in turn, communication terminals such as an IP telephone or client computer systems, etc. are connected (not shown in the figures).
  • a transmitting unit 5 is provided in the first communication device 2 by way of example and a receiving unit 6 is provided in the second communication device 3, which are designed to transmit the data packets via the IP-oriented communication network 4, for example according to the transmission standard G.711 of the ITU.
  • the transmission standard G.726 of the ITU can be used.
  • the transmission unit 5 has a "Voice Activity Detection (VAD)" unit 7, which is connected via a connection line with, for example, an input 12 A data signal or voice data signal received at the input 12 is transmitted to the VAD unit 7 and there is a lack of voice data to be transmitted in the data signal If there are no voice data available, the VAD unit 7 generates a so-called "Silence Insertion Descriptor" (SID) transmission frame which is further processed in the transmission unit 5 and subsequently to the reception unit 6 of the second communication device This process is continued until voice data is again available in the transmission unit 5.
  • SID Stress Insertion Descriptor
  • a "discontinuous transmission” (DTX) unit 8 is provided in the transmission unit 5, which is likewise connected via connecting lines to the input 12 of the first communication device 2 and the VAD unit 7. With the aid of the DTX unit 8, the generated SID transmission frames SID are counted during a coherent speech pause, and thus the frequency of generation or transmission of the SID transmission frames SID during the speech pauses is determined.
  • DTX discontinuous transmission
  • VAD unit 7 is connected via a connecting line with a first "Comfort Noise Generation” (CNG) unit 9, which is also connected via a further connecting line to the input 12.
  • CNG Comfort Noise Generation
  • the background noise present in the speech pause is detected on the basis of "Comfort Noise Generation” parameters CNP, which in particular determine the background noise volume using a Quantized Energy Level parameter QEP and, if appropriate, the background noise spectral properties several “quantized Reflection Coefficients "QRC coefficients
  • CNP Comfort Noise Generation
  • QEP Quantized Energy Level parameter
  • QRC coefficients The determined comfort noise generation parameters CNP and quantized energy level parameters QEP and the quantized reflection coefficients QRC are inserted into the SID transmission frame SID.
  • a first speech signal unit 10 is provided in the transmitting unit 5 of the first communication device 2, which is connected to the input 12 of the first telecommunication device 2.
  • a voice data signal received via the input 12 is coded and inserted into a user data transmission frame VP.
  • the generated user data transmission frames VP and the generated SID transmission frames SID are then inserted into data packets (not shown) and transmitted via the IP-oriented telecommunications network 4.
  • a multiplex unit 11 is connected via connecting lines, which packs the Nutz Schemeübertragungsrahmen VP or the SID transmission frame SID in at least one data packet and to the output E2 of the first communication device 2 for transmission over the IP -oriented telecommunications network 4 controls.
  • a demultiplexer unit 12 is connected, which reads out the transmission frames VP or SID contained in the received data packets and either to a connected second speech signal unit 13 or to a second "Comfort Noise Generation” (CNG) unit 14 forwards.
  • CNG Comfort Noise Generation
  • the information contained in the SID transmission frame SID is read out and evaluated to generate a background noise.
  • a control unit 15 and a memory unit 16 are provided in the receiving unit 6 by way of example, which are provided for controlling the CNG unit 14 and the second voice signal unit 13 as well as for storing data, in particular the last received "Comfort Noise Generation" parameters CNP.
  • FIG. 2 shows by way of example the first byte indicating the "Quantized Energy Level” parameter QEP within the SID transmission frame SID.
  • the noise signal level is given here in -dBov, where values from 0 to 127 and from 0 to -127 dBov can be mapped.
  • 8 bits are provided which correspond to the first byte of the SID transmission frame SID. In this case, the bit having the zeroth bit position is blanketed with the value 0, and the remaining first to seventh bits represent the actual noise signal level value, the "Most Significant Bit” (MSB) being provided at the first bit position.
  • MSB Monitoring Significant Bit
  • the "Quantized Reflection Coefficients" coefficients QRC are transmitted on the basis of the second to M + 1-th bytes within the SID transmission frame SID, the second QRC coefficient N 1 being based on the second byte, the second QRC coefficient N being the second byte 2 , etc. is transmitted.
  • the M-th QRC coefficient N M is finally transmitted last, in which case the number of M of the QRC coefficients QRC determines the order of the digital filter over which the background noise is formed from a Gaussian random signal or stochastic random noise signal.
  • the extracted CNG parameters CNP are subjected to an analysis in such a way that they are first split into the Quantized Energy Level parameter QEP and the Quantized Reflection Coefficients QRC and here the number M of the transmitted ones QRC coefficients N 1 - N M is determined.
  • the parameter values are checked byte-by-byte to determine whether they are within a predetermined range that exceeds CNPF or a predetermined number of bytes by a predetermined CNG parameter format.
  • All remaining, ie non-compliant CNG parameters CNP are first adjusted in a third step 19 to the default CNG parameter format CNPF.
  • standard filters for the generation of the background noise signal can advantageously be used, whereby the adaptation of the filter order of the filters provided in the different transmitting and receiving units is eliminated.
  • a fourth step 20 the content of the CNG parameter CNP, which now consists of a maximum of 11 bytes, is checked in terms of content, i. the QEL parameters QEP and the remaining QRC coefficients QRC are analyzed in greater detail and, for example, missing or incomplete or erroneous or incompatible are replaced by target CNG parameters SCNP.
  • the target CNG parameters SCNP are taken from a "Set of Golden Parameters" SGP which is stored in the memory unit 16.
  • the "Set of Golden Parameters" SGP in a preferred embodiment comprises a golden QEL parameter GQEP and ten golden QRC coefficients GQRC, which were determined by extensive analyzes of numerous test files with standardized or trial samples of speech samples. For this purpose, a spectral analysis of the speech samples was created after they were subjected to high-pass filtering, window filtering and an autocorrelation function and the Levison-Durbin algorithm, wherein the Set of Golden Parameters SGP is selected such that the generated background noise in a uniform frequency range between 900 to 3400 Hz comes to rest. In this case, the received signal energy approaches the said frequency range evenly distributed between 900 to 3400 Hz. In particular, care was taken to ensure that only a few frequency components fall within the frequency range of 300-900 Hz, which produces a louder impression in human hearing.
  • the thus adapted CNG parameters CNP * are then smoothed in a fifth step 21 with regard to the signal level of the background noise that can be generated thereby. This is done, for example, analogously to the method defined in ITU Standard G.711 Appendix II.
  • the adapted QRC coefficients QRC * are converted into "Linear Prediction Coefficient (LPC)" coefficients LPC using the Levison Durbin algorithm.
  • LPC Linear Prediction Coefficient
  • resource-conserving golden LPC coefficients LPC which are also stored in the memory unit 16, can be used directly for the golden QRC coefficients GQRC.
  • a computationally intensive determination of the associated LPC coefficients LPC for the QRC coefficients QRC * taken from the set of golden parameters SGP is omitted.
  • a Gaussian random signal is generated, which is subjected to a calibration.
  • the generated gaussian random signal is performed by filtering through a filter unit applied with the detected LPC coefficients LPC, thereby generating the background noise signal superimposed on the speech data signal.

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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)
  • Telephonic Communication Services (AREA)
EP05111976A 2004-12-29 2005-12-12 Procédé pour l'adaptation de paramètres de génération de bruit de confort Withdrawn EP1677286A1 (fr)

Applications Claiming Priority (1)

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DE102004063290A DE102004063290A1 (de) 2004-12-29 2004-12-29 Verfahren zur Anpassung von Comfort Noise Generation Parametern

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EP1677286A1 true EP1677286A1 (fr) 2006-07-05

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US (1) US20060143001A1 (fr)
EP (1) EP1677286A1 (fr)
CN (1) CN1801327A (fr)
DE (1) DE102004063290A1 (fr)

Families Citing this family (6)

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Publication number Priority date Publication date Assignee Title
US7715372B2 (en) * 2006-12-28 2010-05-11 Verizon Services Organization Inc. Method and system for inserting selected comfort signal
US7688810B2 (en) * 2006-12-28 2010-03-30 Verizon Services Organization Inc. Method and system for inserting comfort signal in reaction to events
US7613175B2 (en) * 2006-12-28 2009-11-03 Verizon Services Organization Inc. Method and system for inserting user defined comfort signal
CN101303855B (zh) * 2007-05-11 2011-06-22 华为技术有限公司 一种舒适噪声参数产生方法和装置
CN104156509A (zh) * 2014-07-24 2014-11-19 西北工业大学 一种噪声合成方法
EP2980801A1 (fr) * 2014-07-28 2016-02-03 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Procédé d'estimation de bruit dans un signal audio, estimateur de bruit, encodeur audio, décodeur audio et système de transmission de signaux audio

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0843301A2 (fr) * 1996-11-15 1998-05-20 Nokia Mobile Phones Ltd. Méthodes pour générer un bruit de confort durant une transmission discontinue
WO2000031719A2 (fr) * 1998-11-23 2000-06-02 Telefonaktiebolaget Lm Ericsson (Publ) Codage de la parole avec variabilite du bruit de confort pour une fidelite accrue
WO2002043048A2 (fr) * 2000-11-27 2002-05-30 Nokia Corporation Procede et systeme de generation de bruit de confort dans les communications telephoniques
US20020120439A1 (en) * 2001-02-28 2002-08-29 Telefonaktiebolaget Lm Ericsson (Publ) Method and apparatus for providing comfort noise in communication system with discontinuous transmission

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6269331B1 (en) * 1996-11-14 2001-07-31 Nokia Mobile Phones Limited Transmission of comfort noise parameters during discontinuous transmission
US7423983B1 (en) * 1999-09-20 2008-09-09 Broadcom Corporation Voice and data exchange over a packet based network
US20030120484A1 (en) * 2001-06-12 2003-06-26 David Wong Method and system for generating colored comfort noise in the absence of silence insertion description packets

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0843301A2 (fr) * 1996-11-15 1998-05-20 Nokia Mobile Phones Ltd. Méthodes pour générer un bruit de confort durant une transmission discontinue
WO2000031719A2 (fr) * 1998-11-23 2000-06-02 Telefonaktiebolaget Lm Ericsson (Publ) Codage de la parole avec variabilite du bruit de confort pour une fidelite accrue
WO2002043048A2 (fr) * 2000-11-27 2002-05-30 Nokia Corporation Procede et systeme de generation de bruit de confort dans les communications telephoniques
US20020120439A1 (en) * 2001-02-28 2002-08-29 Telefonaktiebolaget Lm Ericsson (Publ) Method and apparatus for providing comfort noise in communication system with discontinuous transmission

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
ITU: "G.711 Appendix II: A comfort noise payload definition for ITU-T G.711 use in packet based multimedia communication systems", ITU-T RECOMMENDATION G.711 APPENDIX II, February 2000 (2000-02-01), pages 1 - 11, XP002315190 *

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DE102004063290A1 (de) 2006-07-13
US20060143001A1 (en) 2006-06-29

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