EP1433166A1 - Sprachextender und verfahren zum schätzen eines breitbandigen sprachsignals anhand eines schmalbandigen sprachsignals - Google Patents
Sprachextender und verfahren zum schätzen eines breitbandigen sprachsignals anhand eines schmalbandigen sprachsignalsInfo
- Publication number
- EP1433166A1 EP1433166A1 EP01978183A EP01978183A EP1433166A1 EP 1433166 A1 EP1433166 A1 EP 1433166A1 EP 01978183 A EP01978183 A EP 01978183A EP 01978183 A EP01978183 A EP 01978183A EP 1433166 A1 EP1433166 A1 EP 1433166A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- speech
- broadband
- extender
- voice
- narrowband
- 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.)
- Granted
Links
- 239000004606 Fillers/Extenders Substances 0.000 title claims abstract description 38
- 238000000034 method Methods 0.000 title claims description 24
- 238000004891 communication Methods 0.000 claims abstract description 14
- 230000005540 biological transmission Effects 0.000 claims description 16
- 230000006978 adaptation Effects 0.000 claims description 10
- 230000003044 adaptive effect Effects 0.000 abstract description 3
- 230000005284 excitation Effects 0.000 description 6
- 238000005070 sampling Methods 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000001228 spectrum Methods 0.000 description 2
- 238000003786 synthesis reaction Methods 0.000 description 2
- 230000001419 dependent effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000010295 mobile communication Methods 0.000 description 1
- COCAUCFPFHUGAA-MGNBDDOMSA-N n-[3-[(1s,7s)-5-amino-4-thia-6-azabicyclo[5.1.0]oct-5-en-7-yl]-4-fluorophenyl]-5-chloropyridine-2-carboxamide Chemical compound C=1C=C(F)C([C@@]23N=C(SCC[C@@H]2C3)N)=CC=1NC(=O)C1=CC=C(Cl)C=N1 COCAUCFPFHUGAA-MGNBDDOMSA-N 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000008054 signal transmission Effects 0.000 description 1
- 230000002194 synthesizing effect Effects 0.000 description 1
- 238000012549 training Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
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
- the invention relates to a speech extender according to the preamble of claim 1 and a method for estimating a broadband speech signal based on a narrowband speech signal according to the preamble of claim 8.
- speech codecs To compress the data transmission rate for speech signals are speech, also called 'the voice codecs used. They are mainly used in mobile radio systems. In GSM mobile radio systems (Global System for Mobile Communication), speech coders are used that work according to the linear predictive coding (LPC) method. In contrast to a waveform coding, it is not the speech signal itself that is reproduced, but rather its process of creation in the human speech tract. With a sampling rate of the speech signal of 8 kHz, a data rate of 104 kbit / s results with a resolution of 13 bits. With GSM, this data rate is reduced to a constant 13 Kbit / s (so-called code rate) using LPC.
- LPC linear predictive coding
- full rate fill rate codec
- improved full rate codecs enhanced fill rate codec
- UMTS Universal Mobile Telecommunications System
- voice encoders will be used that can encode voice signals with a variable bit rate.
- a speech coder is, for example, the adaptive multirate (AMR) speech coder, which enables coding with different bit rates. It was designed for GSM mobile radio systems, but is also said to be 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 the transmission of the coded speech signal. If sufficient bandwidth is available for transmission, the voice signal is encoded with a high bit rate. This is also known as broadband coding. Otherwise, ie with a low bandwidth, coding is carried out with a low bit rate (narrow-band coding).
- the bit rate can be adjusted during the transmission of a speech signal.
- the bandwidth of a transmission channel is continuously measured in the form of the available bit rate. If the available bit rate falls below a predetermined threshold during a transmission of the speech signal, the coding is switched so that the speech signal is coded in a narrow band.
- two different encodings with correspondingly different bit rates can be provided.
- Broadband coding takes place, for example, at a sampling frequency of approximately 16 kHz, while narrowband coding takes place at a sampling frequency of 8 kHz.
- narrowband coding takes place at a sampling frequency of 8 kHz.
- a speech frequency range up to 8 kHz is covered, in the second case up to 4 kHz.
- the fluctuation in the signal quality caused by the switching of the bit rate and the associated quality fluctuation of a communication link are problematic. Due to the predefined threshold, switching takes place relatively abruptly, so that the quality of the connection can suddenly drop during a call.
- broadband speech extender or wideband speech extender
- short speech extender By using a so-called broadband speech extender (or wideband speech extender) or short speech extender, a clearly better speech quality even with narrowband coding and the quality-reducing effect of the abrupt switching can be reduced somewhat.
- the broadband speech extender uses the narrowband signal to estimate the broadband speech signal by synthesizing the speech frequency components above 4 kHz. This avoids an excessive loss of quality when switching the bit rate for coding.
- the method provided by the broadband voice extender for adapting the bit rate of a voice signal works quite well for almost all speakers, in particular it offers a perfectly acceptable voice quality.
- the present invention is intended to further improve the voice quality of a voice extender, in particular a broadband voice extender. Furthermore, a method for estimating a broadband speech signal on the basis of a narrowband speech signal is to be specified that enables 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.
- the voice quality can be further improved compared to known methods and voice extenders.
- the invention specifically relates to a speech extender which is designed such that it estimates a broadband speech signal using a narrowband speech signal. Further is it so adaptive that it adapts to a communication terminal and / or a speaker during coding. The adaptation is preferably carried out during a voice transmission. This enables the voice extender to continuously adapt to the remote party.
- the speech extender can analyze and save at least one speech parameter and use it for adaptation.
- the at least one speech parameter can in particular be a broadband speech parameter that occurs during a speech transmission.
- the at least one speech parameter speaker and / or communication terminal-specific can be '.
- the voice extender can be used in various mobile phones and adapt to their acoustic properties.
- he can address different users, ie their acoustic properties such as different speech frequency spectra.
- Characteristic acoustic properties of the communication terminal and / or the speaker are therefore preferably used as speech parameters, for example frequency profiles, attenuations of specific frequencies or frequency ranges, and the frequency spectrum of the speaker's voice.
- Such speech parameters can be determined in particular by measurements during a speech transmission.
- the speech extender preferably makes estimates by evaluating at least one stored speech parameter.
- different language parameters can be used for adaptation. These are saved after their determination and are therefore available for adaptation at any time. It would also be conceivable to continuously update the stored speech parameters in order to always be optimally adapted to the current acoustic conditions.
- the voice extender can be used in a voice encoder of a mobile and / or base station which is or is designed for a third-generation mobile radio system.
- the third generation mobile radio system can in particular be UMTS.
- the voice 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 voice extender can be integrated on a chip together with other essential circuit elements of the mobile radio terminal. For example, a chip manufacturer can offer such voice extenders for producers of mobile radio terminals.
- an implementation in software offers the advantage that the language extender can be changed more easily, and above all that it can be changed later, especially if the language extender's software is stored in an erasable and rewritable memory such as an EEPROM.
- the invention further relates to a method for estimating a broadband speech signal on the basis of a narrowband speech signal. According to the method, an adaptation to a communication terminal and / or to a speaker is carried out during the estimation.
- At least one speech parameter is analyzed, stored and used for adaptation.
- the at least one speech parameter is preferably a broadband speech parameter that occurs during a speech transmission.
- the at least one language parameter can be specific to the speaker and / or communication terminal.
- the method can advantageously be used in a speech coder of a mobile and / or base station are 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 generally only the narrowband excitation signal and the narrowband filter coefficients are known, it is necessary to carry out a "narrowband" to "broadband” transformation. This is done using a broadband voice extender.
- the excitation signal can be expanded, for example, by non-linear signal processing. Another possibility is to overlay the excitation signal with white noise.
- the filter coefficients can be estimated using two code books.
- the entries in the code books represent possible sets of filter coefficients.
- a narrowband and a broadband code book are trained. Since they are trained simultaneously with the same excitation signal (once narrowband and once broadband), the relationship between the entries in both code books is known. For example, entry 1 of the narrowband code book corresponds to entry 2 of the broadband code book.
- both code books are used as follows:
- the narrow-band filter coefficients are calculated from the narrow-band speech signal.
- Speech signal sections are synthesized on the basis of the broadband filter coefficients found and the extended excitation signal.
- the narrowband filter coefficients are calculated from the narrowband language. These coefficients are compared with the entries in the codebook with narrowband coefficients and the most suitable entry is selected. Since - as already mentioned above - the relationship between the code books is known, the optimal filter coefficients for the speech synthesis filter of the broadband speech extender are estimated in this way.
- the method can also be implemented adaptively, for example in the following steps:
- the narrowband speech signal is calculated from the broadband speech signal and the narrowband filter coefficients are determined.
- CB-Vector (new) c * FK + (1 - c) * CB-Vector (old) 6.
- the broadband filter coefficients are estimated using the modified code book.
- a further improvement in the speech quality is achieved by the speech extender according to the invention. It can be used particularly advantageously in all communication systems in which speech coders with variable bit rate are used, which can encode both narrowband and broadband, for example in 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)
Abstract
Description
Claims
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/DE2001/003729 WO2003036623A1 (de) | 2001-09-28 | 2001-09-28 | Sprachextender und verfahren zum schätzen eines breitbandigen sprachsignals anhand eines schmalbandigen sprachsignals |
Publications (3)
Publication Number | Publication Date |
---|---|
EP1433166A1 true EP1433166A1 (de) | 2004-06-30 |
EP1433166B1 EP1433166B1 (de) | 2007-11-14 |
EP1433166B8 EP1433166B8 (de) | 2008-01-02 |
Family
ID=5648296
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP01978183A Expired - Lifetime EP1433166B8 (de) | 2001-09-28 | 2001-09-28 | Sprachextender und verfahren zum schätzen eines breitbandigen sprachsignals anhand eines schmalbandigen sprachsignals |
Country Status (5)
Country | Link |
---|---|
US (1) | US20040243400A1 (de) |
EP (1) | EP1433166B8 (de) |
CN (1) | CN100403401C (de) |
DE (1) | DE50113277D1 (de) |
WO (1) | WO2003036623A1 (de) |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2004090870A1 (ja) * | 2003-04-04 | 2004-10-21 | Kabushiki Kaisha Toshiba | 広帯域音声を符号化または復号化するための方法及び装置 |
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 |
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 |
US9837089B2 (en) * | 2015-06-18 | 2017-12-05 | Qualcomm Incorporated | High-band signal generation |
Family Cites Families (16)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4311877A (en) * | 1979-12-19 | 1982-01-19 | Kahn Leonard R | Method and means for improving the reliability of systems that transmit relatively wideband signals over two or more relatively narrowband transmission circuits |
US4330689A (en) * | 1980-01-28 | 1982-05-18 | The United States Of America As Represented By The Secretary Of The Navy | Multirate digital voice communication processor |
DK0474812T3 (da) * | 1990-03-08 | 1995-11-06 | Ericsson Telefon Ab L M | System og fremgangsmåde til dynamisk allokering af søgedirigeringsnumre |
JP2779886B2 (ja) * | 1992-10-05 | 1998-07-23 | 日本電信電話株式会社 | 広帯域音声信号復元方法 |
US5455888A (en) * | 1992-12-04 | 1995-10-03 | Northern Telecom Limited | Speech bandwidth extension method and apparatus |
WO1995002288A1 (en) * | 1993-07-07 | 1995-01-19 | Picturetel Corporation | Reduction of background noise for speech enhancement |
US5668837A (en) * | 1993-10-14 | 1997-09-16 | Ericsson Inc. | Dual-mode radio receiver for receiving narrowband and wideband signals |
EP0732687B2 (de) * | 1995-03-13 | 2005-10-12 | Matsushita Electric Industrial Co., Ltd. | Vorrichtung zur Erweiterung der Sprachbandbreite |
US5706335A (en) * | 1995-04-10 | 1998-01-06 | Corporate Computer Systems | Method and appartus for transmitting coded audio signals through a transmission channel with limited bandwidth |
US5806025A (en) * | 1996-08-07 | 1998-09-08 | U S West, Inc. | Method and system for adaptive filtering of speech signals using signal-to-noise ratio to choose subband filter bank |
US5901145A (en) * | 1997-02-28 | 1999-05-04 | Telefonaktiebolaget L M Ericsson (Publ) | Mobile station handoff between a spread spectrum communications system and a frequency division communications system |
DE19804581C2 (de) * | 1998-02-05 | 2000-08-17 | Siemens Ag | Verfahren und Funk-Kommunikationssystem zur Übertragung von Sprachinformation |
EP0945852A1 (de) * | 1998-03-25 | 1999-09-29 | BRITISH TELECOMMUNICATIONS public limited company | Sprachsynthese |
GB2357682B (en) * | 1999-12-23 | 2004-09-08 | Motorola Ltd | Audio circuit and method for wideband to narrowband transition in a communication device |
US6704711B2 (en) * | 2000-01-28 | 2004-03-09 | Telefonaktiebolaget Lm Ericsson (Publ) | System and method for modifying speech signals |
WO2003003350A1 (en) * | 2001-06-28 | 2003-01-09 | Koninklijke Philips Electronics N.V. | Wideband signal transmission system |
-
2001
- 2001-09-28 EP EP01978183A patent/EP1433166B8/de not_active Expired - Lifetime
- 2001-09-28 CN CNB018236731A patent/CN100403401C/zh not_active Expired - Fee Related
- 2001-09-28 WO PCT/DE2001/003729 patent/WO2003036623A1/de active IP Right Grant
- 2001-09-28 US US10/491,052 patent/US20040243400A1/en not_active Abandoned
- 2001-09-28 DE DE50113277T patent/DE50113277D1/de not_active Expired - Fee Related
Non-Patent Citations (1)
Title |
---|
See references of WO03036623A1 * |
Also Published As
Publication number | Publication date |
---|---|
WO2003036623A1 (de) | 2003-05-01 |
CN1630896A (zh) | 2005-06-22 |
DE50113277D1 (de) | 2007-12-27 |
US20040243400A1 (en) | 2004-12-02 |
EP1433166B8 (de) | 2008-01-02 |
EP1433166B1 (de) | 2007-11-14 |
CN100403401C (zh) | 2008-07-16 |
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