EP1433166B1 - Dispositif d'extension vocale et procede pour evaluer un signal vocal a large bande au moyen d'un signal vocal a bande etroite - Google Patents

Dispositif d'extension vocale et procede pour evaluer un signal vocal a large bande au moyen d'un signal vocal a bande etroite Download PDF

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Publication number
EP1433166B1
EP1433166B1 EP01978183A EP01978183A EP1433166B1 EP 1433166 B1 EP1433166 B1 EP 1433166B1 EP 01978183 A EP01978183 A EP 01978183A EP 01978183 A EP01978183 A EP 01978183A EP 1433166 B1 EP1433166 B1 EP 1433166B1
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EP
European Patent Office
Prior art keywords
speech
extender
wideband
speech signal
signal
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 - Lifetime
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EP01978183A
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German (de)
English (en)
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EP1433166B8 (fr
EP1433166A1 (fr
Inventor
Stefano Ambrosius Klinke
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Nokia Solutions and Networks GmbH and Co KG
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Nokia Siemens Networks GmbH and Co KG
Nokia Solutions and Networks SpA
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Publication of EP1433166B8 publication Critical patent/EP1433166B8/fr
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Classifications

    • 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

  • speech encoders For compressing the data transmission rate in speech signals, speech encoders, also referred to as speech codecs, are used. They are mainly used in mobile radio systems.
  • GSM Global System for Mobile Communication
  • speech encoders that work according to the Linear Predictive Coding (LPC) method.
  • LPC Linear Predictive Coding
  • a sampling rate of the speech signal of 8 kHz results in a data rate of 104 kbit / s at a resolution of 13 bits.
  • this data rate is reduced to a constant 13 KBit / s (so-called code rate) by means of LPC.
  • full-rate codecs or improved full-rate codecs are used, for example, in GSM.
  • a half-rate codec Half Rate Codec
  • the bit rate can be greatly reduced with correspondingly reduced voice quality, namely to 5.6 kbit / s.
  • UMTS Universal Mobile Telecommunications System
  • voice encoders which can encode voice signals with a variable bit rate.
  • One such speech coder is, for example, the Adaptive Multirate (AMR) speech coder, which allows encoding at various bit rates. It was designed for GSM cellular systems, but is also intended for use in UMTS mobile radio systems are used as standard speech coders.
  • AMR Adaptive Multirate
  • the bit rate can be adapted to the bandwidth available for transmitting the coded speech signal. If sufficient bandwidth is available for transmission, the speech signal is coded at a high bit rate. This is also referred to as broadband coding. Otherwise, ie with a low bandwidth, is coded with a low bit rate (narrowband coding).
  • the adaptation of the bit rate can take place during the transmission of a speech signal.
  • the bandwidth of a transmission channel in the form of the available bit rate is continuously measured. If the available bit rate drops below a predetermined threshold during a transmission of the speech signal, the coding is switched so that the speech signal is narrow-band coded.
  • a broadband coding takes place, for example, at a sampling frequency of about 16 kHz, while a narrow-band coding takes place at a sampling frequency of 8 kHz.
  • a voice frequency range up to 8 kHz in the second case up to 4 kHz is covered.
  • the problem is caused by the switching of the bit rate fluctuation of the signal quality and the associated quality variation of a communication link. Due to the predetermined threshold, the switching takes place relatively abruptly, so that the quality of the connection can suddenly drop during a conversation.
  • US-A-5 581 652 discloses a speech extender which, in a training phase, generates codebooks with which narrowband speech signals are converted into broadband in an application phase.
  • the speech quality of a speech extender is to be further improved. Furthermore, a method for estimating a wideband speech signal based on a narrow-band speech signal is to be specified, which enables an improved speech quality.
  • the core of the invention is to make an adaptation to a communication terminal and / or to a speaker during a voice signal transmission. As a result, the voice quality can be improved again compared to known methods and speech extender.
  • the invention relates to a speech extender which is adapted to estimate a wideband speech signal based on a narrow-band speech signal. Further it is adaptive such that it adapts a codebook to a communication terminal and / or to a speaker. The adaptation takes place during a voice transmission. This allows the Konnier to constantly adapt to the remote party.
  • the speech extender analyzes and stores at least one speech parameter and uses it for adaptation.
  • the at least one speech parameter is a wideband speech parameter that occurs during a speech transmission.
  • the at least one speech parameter can be speaker and / or communication terminal-specific.
  • the speech extender can be used in various mobile phones and adapt to their acoustic properties. Furthermore, it can address different users, i. adapt to their acoustic properties such as different speech frequency spectra.
  • speech parameters therefore preferably characteristic acoustic properties of the communication terminal and / or the speaker are used, such as frequency characteristics, attenuation of certain frequencies or frequency ranges and the frequency spectrum of the voice of the speaker.
  • Such speech parameters can be determined in particular by measurements during a speech transmission.
  • the speech extender makes estimates by evaluating at least one stored speech parameter.
  • different speech parameters can be used for the adaptation. These are stored after their determination and are therefore available for adaptation at any time. It would also be conceivable to constantly update the stored speech parameters in order to always be optimally adapted to the current acoustic conditions.
  • the speech extender can be used in a speech coder of a mobile and / or base station designed for a third generation mobile radio system.
  • the third generation mobile radio system may be UMTS.
  • the speech extender is preferably implemented in hardware, in particular in an integrated circuit, and / or in software.
  • An implementation in hardware offers the advantage that the speech extender can be integrated on a chip together with other essential circuit elements of the mobile radio terminal. For example, a chip manufacturer may offer such language extenders to mobile terminal manufacturers.
  • an implementation in software offers the advantage of easier changeability of the speech extender, and above all of the subsequent change, in particular if the software of the speech extender is stored in an erasable and rewritable memory such as an EEPROM.
  • the invention relates to a method for estimating a wideband speech signal based on a narrow-band speech signal. According to the method, an adaptation of a codebook to a communication terminal and / or to a speaker is carried out during estimation.
  • the method can be advantageously used in a speech coder of a mobile and / or base station, the or are designed for a third generation mobile radio system, in particular UMTS.
  • the mobile station is a mobile radio terminal and the method is implemented in hardware, in particular in an integrated circuit, and / or at least partially in software.
  • a broadband excitation signal and broadband filter coefficients are required for the synthesis filter in the speech coder. Since usually only the narrow-band excitation signal and the narrow-band filter coefficients are known, it is necessary to carry out a transformation from "narrowband" to "broadband". This is done by means of a broadband speech extender.
  • the excitation signal can be extended, for example, by a non-linear signal processing. Another possibility is to superimpose the excitation signal with white noise.
  • the filter coefficients can be estimated by using two codebooks.
  • the entries of the codebooks represent possible sets of filter coefficients.
  • a narrowband and a wideband codebook are trained. Since they are trained simultaneously with the same excitation signal (once narrowband and once wideband), the relationship between the entries of both codebooks is known. For example, entry 1 of the narrow-band codebook corresponds to the entry 2 of the wideband codebook.
  • the narrow-band filter coefficients are calculated from the narrow-band speech. These coefficients are compared with the entries of the narrow-band coefficient codebook and the best matching entry is chosen. Since, as already mentioned above, the relationship between the codebooks is known, the optimal filter coefficients for the speech synthesis filter of the wideband speech extender are estimated in this way.
  • the speech extender according to the invention achieves a further improvement of the speech quality. It can be used particularly advantageously in all communication systems in which variable bit rate speech coders can be used, which can code both narrowband and broadband, for example in the case of UMTS.

Landscapes

  • Engineering & Computer Science (AREA)
  • Computational Linguistics (AREA)
  • Quality & Reliability (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)
  • Compression, Expansion, Code Conversion, And Decoders (AREA)
  • Mobile Radio Communication Systems (AREA)

Claims (10)

  1. Dispositif d'extension vocale exécuté de telle sorte qu'il évalue un signal vocal à large bande au moyen d'un signal vocal à bande étroite, caractérisé en ce qu'il adapte un dictionnaire de manière adaptative à un terminal de communication et/ou à un locuteur pendant une transmission vocale à large bande et comprend des moyens grâce auxquels il analyse, enregistre et utilise pour l'adaptation au moins un paramètre vocal de large bande intervenant pendant la transmission vocale.
  2. Dispositif d'extension vocale selon la revendication 1, caractérisé en ce que le au moins un paramètre vocal est un paramètre spécifique à un locuteur et/ou à un terminal de communication.
  3. Dispositif d'extension vocale selon la revendication 2, caractérisé en ce qu'il procède à une évaluation en exploitant au moins un paramètre vocal enregistré.
  4. Dispositif d'extension vocale selon l'une des revendications précédentes, caractérisé en ce qu'il est utilisé dans un codeur vocal d'une station mobile et/ou de base exécutée resp. exécutées pour un système de radiotéléphonie mobile de troisième génération, notamment l'UMTS.
  5. Dispositif d'extension vocale selon la revendication 4, caractérisé en ce que la station mobile est un terminal de radiotéléphonie mobile et le dispositif d'extension vocale est réalisé sous forme matérielle, notamment dans un circuit intégré, et/ou au moins partiellement sous forme logicielle.
  6. Procédé d'évaluation d'un signal vocal à large bande au moyen d'un signal vocal à bande étroite, caractérisé en ce qu'une adaptation adaptative d'un dictionnaire à un terminal de communication et/ou à un locuteur est exécutée lors d'une transmission vocale à large bande et au moins un paramètre vocal de large bande intervenant pendant la transmission vocale est analysé, enregistré et utilisé pour l'adaptation.
  7. Procédé selon la revendication 6, caractérisé en ce que le au moins un paramètre vocal est un paramètre spécifique à un locuteur et/ou à un terminal de communication.
  8. Procédé selon la revendication 7, caractérisé en ce que l'évaluation se fait en exploitant au moins un paramètre vocal enregistré.
  9. Procédé selon l'une des revendications 6 à 8, caractérisé en ce qu'il est utilisé dans un codeur vocal d'une station mobile et/ou de base exécutée resp. exécutées pour un système de radiotéléphonie mobile de troisième génération, notamment l'UMTS.
  10. Procédé selon la revendication 9, caractérisé en ce que la station mobile est un terminal de radiotéléphonie mobile et le procédé est exécuté dans un matériel, notamment dans un circuit intégré, et/ou au moins partiellement dans un logiciel.
EP01978183A 2001-09-28 2001-09-28 Dispositif d'extension vocale et procede pour evaluer un signal vocal a large bande au moyen d'un signal vocal a bande etroite Expired - Lifetime EP1433166B8 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/DE2001/003729 WO2003036623A1 (fr) 2001-09-28 2001-09-28 Dispositif d'extension vocale et procede pour evaluer un signal vocal a large bande au moyen d'un signal vocal a bande etroite

Publications (3)

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EP1433166A1 EP1433166A1 (fr) 2004-06-30
EP1433166B1 true EP1433166B1 (fr) 2007-11-14
EP1433166B8 EP1433166B8 (fr) 2008-01-02

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EP01978183A Expired - Lifetime EP1433166B8 (fr) 2001-09-28 2001-09-28 Dispositif d'extension vocale et procede pour evaluer un signal vocal a large bande au moyen d'un signal vocal a bande etroite

Country Status (5)

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US (1) US20040243400A1 (fr)
EP (1) EP1433166B8 (fr)
CN (1) CN100403401C (fr)
DE (1) DE50113277D1 (fr)
WO (1) WO2003036623A1 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004090870A1 (fr) * 2003-04-04 2004-10-21 Kabushiki Kaisha Toshiba Procede et dispositif pour le codage ou le decodage de signaux audio large bande
US8818797B2 (en) 2010-12-23 2014-08-26 Microsoft Corporation Dual-band speech encoding
KR102244612B1 (ko) * 2014-04-21 2021-04-26 삼성전자주식회사 무선 통신 시스템에서 음성 데이터를 송신 및 수신하기 위한 장치 및 방법
US9837089B2 (en) * 2015-06-18 2017-12-05 Qualcomm Incorporated High-band signal generation
US10847170B2 (en) 2015-06-18 2020-11-24 Qualcomm Incorporated Device and method for generating a high-band signal from non-linearly processed sub-ranges

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Also Published As

Publication number Publication date
DE50113277D1 (de) 2007-12-27
EP1433166B8 (fr) 2008-01-02
EP1433166A1 (fr) 2004-06-30
US20040243400A1 (en) 2004-12-02
WO2003036623A1 (fr) 2003-05-01
CN1630896A (zh) 2005-06-22
CN100403401C (zh) 2008-07-16

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