EP0961264B1 - Appareil d'émission/réception pour sélectionner un codeur de source et procédés mis en oeuvre dans un tel appareil - Google Patents

Appareil d'émission/réception pour sélectionner un codeur de source et procédés mis en oeuvre dans un tel appareil Download PDF

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Publication number
EP0961264B1
EP0961264B1 EP99201604A EP99201604A EP0961264B1 EP 0961264 B1 EP0961264 B1 EP 0961264B1 EP 99201604 A EP99201604 A EP 99201604A EP 99201604 A EP99201604 A EP 99201604A EP 0961264 B1 EP0961264 B1 EP 0961264B1
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EP
European Patent Office
Prior art keywords
signal
coder
source
estimate
distortion
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Expired - Lifetime
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EP99201604A
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German (de)
English (en)
French (fr)
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EP0961264A1 (fr
Inventor
Gilles Miet
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.)
Koninklijke Philips NV
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Koninklijke Philips Electronics NV
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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
    • G10L19/04—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 using predictive techniques
    • G10L19/16—Vocoder architecture
    • G10L19/18—Vocoders using multiple modes

Definitions

  • the invention applies in particular to any cellular terminal operating according to a digital telecommunications standard of GSM type (from the English Global System for Mobile communications), PCS1900 (Personal Communications System), PHS (Personal Handyphone System), TDMA (Time Division Multiple Access), CDMA (Code Division Multiple Access), WBCDMA (Wide Band CDMA), UMTS (Universal Mobile Telecommunications System), etc.
  • GSM Global System for Mobile communications
  • PCS1900 Personal Communications System
  • PHS Personal Handyphone System
  • TDMA Time Division Multiple Access
  • CDMA Code Division Multiple Access
  • WBCDMA Wide Band CDMA
  • UMTS Universal Mobile Telecommunications System
  • the Japanese abstract published under the number 08237711 A describes a device transmission / reception of the kind mentioned in the introductory paragraph, to increase the quality of an audio signal to be transmitted.
  • the device includes means for test directly on the useful signal, the performance of source encoder families successively selected from a list of available families and means for compare each output signal to the original signal in order to transmit only the signal coded closest to the original signal.
  • EPO 417,739 also discloses such a device.
  • the invention proposes a more economical method for optimizing the compromise quality of transmission of the speech signal / capacity of the communication medium, within digital telecommunications apparatus involving source coding.
  • each original signal undergoes only one source coding test before the selection of the optimum encoder, while remaining in the same family of encoders.
  • the reception part comprises a plurality of decoders compatible with said source coders and means for command cooperating with said control means to automatically select, among the plurality of decoders, a decoder compatible with the source encoder selected by said control means.
  • the source coder delivers an internal residual error signal and said calculation means use said error signal to estimate said distortion.
  • the invention finally provides a reception method of the kind mentioned in the introductory paragraph for decoding a signal compressed by a transmission method of the type above, remarkable in that it includes a step of automatic selection of a decoder from among a plurality of decoders available as a function of said source coder selected.
  • Figure 1 is a block diagram of a conventional digital transmitter.
  • FIG. 2 is a block diagram of the transmission part of a transmission / reception apparatus according to the invention.
  • FIG. 3 illustrates a first embodiment of the transmission part shown schematically in Figure 2.
  • FIG. 4 illustrates a second embodiment of the transmission part shown schematically in Figure 2.
  • FIG. 5 is a flow diagram illustrating a transmission method according to the invention.
  • Figure 6 shows an example of a digital telecommunications system according to the invention.
  • FIG. 1 The general structure of a digital transmitter for a GSM type system, that is to say without spectrum spreading, is given in FIG. 1. It includes a source 10, a source encoder 11 (COD), a channel encoder 12, a multiplexer 13, a modulator 14 (MOD), a device 15 for transposing the signal to the radio frequency fr and an antenna 16.
  • the signal S emitted by the source 10 is either analog, such as for example the speech, and must therefore be digitized, either directly digital like the signals of signaling.
  • This signal undergoes coding, called source coding, by the source coder 11 for minimize the amount of information to be sent.
  • MIC modulation coded pulse
  • analysis analysis coding There are many methods of source coding such as modulation coded pulse (MIC) or analysis analysis coding.
  • LPC Linear Predictive Coding
  • the signal thus coded is processed by a second coder 12, called the channel coder, whose purpose is to add redundancy to the sequence of symbols to be transmitted, to reduce the risk of transmission errors.
  • the coded data is then brought into form and multiplexed between the different available logical channels, by the multiplexer 13, depending on the type of multiple access used for transmission. For example, for a time multiplexing system, a physical channel occupies only one time slot limited. It is therefore necessary to share the information blocks coded in sub-blocks to be inserted in the time slots on the radio channel.
  • the symbol sequence is modulated by the modulator 14.
  • This operation consists in transforming the sequence of numerical symbols into signal to be transmitted through the channel.
  • the signal is then transformed into a waveform according to the type of modulation chosen.
  • the modulation produces an overflow on the neighboring channels to be filtered.
  • the appropriate device 15 then transposes the signal to the radio frequency fr, i.e. the carrier frequency of the channel, before it is transmitted on radio waves through the antenna 16.
  • the receiver is also of generally conventional shape, a person skilled in the art can easily deduce its structure from that of the transmitter which has just been described.
  • a transmission device is illustrated in FIG. 2.
  • the blocks common in Figure 1 have the same references.
  • a calculation block 21 as well as a block 23 control have been added to the conventional broadcast chain.
  • the calculation block 21 includes measurement means for estimating the distortion of the signal source encoder output 11.
  • the source encoding block 11 includes several encoders likely to be selected by the control block 23.
  • the control block 23 compare the estimate of the distortion to threshold values stored in a table in device memory and selects a source encoder from the encoders available in the source coding block 11, as a function of the result of the comparison.
  • the different encoders can for example be referenced in order of precision increasing, that is to say in order of increasing output flow.
  • a threshold of high reference (respectively low) is reached for the estimation of the distortion
  • the block of control automatically selects the next higher available encoder (respectively lower) in terms of precision.
  • the control block 23 must then make a request to the network to ask it to change the encoder and must wait for its agreement before actually selecting the new coder better suited. In case of network refusal, the old encoder is kept. In Indeed, it is imperative that the two communicating parties, here the radiotelephone and the network, use compatible encoders and decoders.
  • Some networks transmit digital messages from mobile to mobile without decode the information.
  • the receivers of mobile devices must use a decoder capable of decoding the messages transmitted by the transmitters of their correspondents.
  • the invention provides that the selection of a source encoder in the transmitter of the transmitting / receiving device automatically triggers the selection a compatible decoder in the receiver.
  • FIG. 3 illustrates a first embodiment of the invention for estimating the distortion of the signal at the output of the source encoder 11.
  • This error e is then filtered by a perceptual filter 34 and its energy is calculated by an energy calculation block 35.
  • FIG. 4 illustrates a second embodiment of the invention for estimating the signal distortion at the source encoder output.
  • the encoder from source 11 has an internal ER residual error which can be accessed to get information.
  • This residual error is then filtered by a perceptual filter 41 (this filter is already present in the emission chain of radiotelephones conforming to the standard GSM EFR 06.60).
  • the energy of the filtered error is then calculated by a calculation device of energy 43 to provide the control unit 23 with an estimate E of the signal distortion due to source encoder 11.
  • Step K0 represents the reception of the speech signal S by the source coder.
  • the signal S then undergoes a double coding step K1: a source coding intended for compress the signal to be transmitted and a channel coding intended to protect it against transmission errors.
  • step K2 an estimate E is made of the distortion provided by the speech coder to the original signal. This estimate E can be made, by example, according to one of the methods described in relation to FIGS. 3 and 4.
  • the method is continues with a control step which includes a sub-step K3 for comparing the estimated distortion E at setpoints, followed by a decision substep K4 for choose a coder according to this estimate, among the coders present in the transmitter.
  • Step K5 consists in making a request to the network to ask it to replace the old encoder with the selected encoder and wait for the network response. If the answer is positive (K6), the coder beforehand selected replaces the old one in the transmitter, otherwise (K7), the old encoder is kept.
  • This process is preferably carried out once per data frame. But if the network or the correspondent's mobile receiver does not allow the choice of decoder (for example example it has only one decoder or else the bit rate is unacceptable), the process will only be done once per connection or per communication.
  • Figure 6 shows a cellular radio system, for example GSM type.
  • the invention can be implemented in all systems of digital communications for which an audio signal source coding is made.
  • the system shown in Figure 6 includes two base radio stations 60, 61 connected to the GSM 62 network, as well as two mobile phones 63 and 64 capable of communicate with each other by radio within a coverage area 65, representing the radio coverage area of the GSM network, through base stations 60, 61 and of the network 62.
  • the stations 60, 61 provide the radio interface between the GSM 62 network and the mobiles 63, 64.
  • the current GSM standard provides for network decoding of coded messages and transmitted by the transmitting mobiles, before transmitting them to the receiving mobiles.
  • the source coding means located in mobiles must therefore be compatible with decoding means used by the network.
  • the transmitting part of mobile 63 after having selected a source coder as previously described, must send a request to the network 60, 61, 62 to ask him to adapt his decoding means to the source encoder which has just been selected on transmission. Upon receipt of a confirmation message, the sending party of the mobile 63 can then effectively change the encoder.
  • a mobile transmitter of a speech message for example mobile 63 and a receiving mobile, for example mobile 64.
  • the mobile 63 selects a source encoder, but instead of ask the network for authorization to use this source encoder, it sends a request to mobile receiver 64 in the form of a signaling message, via the network. Because if the network does not decode the coded messages in transmission, the task falls to the mobile receiver 64.
  • the receiving part of the receiving mobile 64 must be provided with means for selecting a decoder compatible with the source coder used in transmission. These means comprise a plurality of decoders compatible with the coders of source of the transmission part as well as control means for selecting automatically, at the request of the sending mobile, a compatible decoder among the plurality of decoders.
  • the invention provides that the reception part of a mobile automatically selects a decoder compatible with the encoder previously selected for transmission.
  • the reception part includes a plurality of decoders compatible with said source coders and means for command cooperating with the control means of the transmission part to select automatically, among the plurality of decoders, a decoder compatible with the coder source selected during transmission.

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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)
  • Compression, Expansion, Code Conversion, And Decoders (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Transmission Systems Not Characterized By The Medium Used For Transmission (AREA)
EP99201604A 1998-05-26 1999-05-21 Appareil d'émission/réception pour sélectionner un codeur de source et procédés mis en oeuvre dans un tel appareil Expired - Lifetime EP0961264B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9806616 1998-05-26
FR9806616 1998-05-26

Publications (2)

Publication Number Publication Date
EP0961264A1 EP0961264A1 (fr) 1999-12-01
EP0961264B1 true EP0961264B1 (fr) 2004-12-15

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EP99201604A Expired - Lifetime EP0961264B1 (fr) 1998-05-26 1999-05-21 Appareil d'émission/réception pour sélectionner un codeur de source et procédés mis en oeuvre dans un tel appareil

Country Status (7)

Country Link
US (1) US6499008B2 (ko)
EP (1) EP0961264B1 (ko)
JP (1) JP2000091922A (ko)
KR (1) KR100587431B1 (ko)
CN (1) CN1192656C (ko)
DE (1) DE69922582T2 (ko)
ES (1) ES2235431T3 (ko)

Families Citing this family (10)

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Publication number Priority date Publication date Assignee Title
IT1314626B1 (it) * 2000-04-21 2002-12-20 Ik Multimedia Production Srl Procedimento per la codifica e la decodifica di flussi di dati,rappresentanti suoni in forma digitale, all'interno di un
US7020603B2 (en) * 2002-02-07 2006-03-28 Intel Corporation Audio coding and transcoding using perceptual distortion templates
US8149810B1 (en) 2003-02-14 2012-04-03 Marvell International Ltd. Data rate adaptation in multiple-in-multiple-out systems
US7864678B1 (en) * 2003-08-12 2011-01-04 Marvell International Ltd. Rate adaptation in wireless systems
US7697449B1 (en) 2004-07-20 2010-04-13 Marvell International Ltd. Adaptively determining a data rate of packetized information transmission over a wireless channel
US7529295B1 (en) * 2004-04-02 2009-05-05 Raytheon Company Acquiring frequency and phase offset estimates using frequency domain analysis
US8781612B2 (en) * 2008-07-09 2014-07-15 Nxp, B.V. Method and device for digitally processing an audio signal and computer program product
GB0920729D0 (en) * 2009-11-26 2010-01-13 Icera Inc Signal fading
EP3252763A1 (en) * 2016-05-30 2017-12-06 Nokia Technologies Oy Low-delay audio coding
CN114978413B (zh) * 2021-02-24 2024-05-03 华为技术有限公司 信息编码的控制方法及相关装置

Family Cites Families (9)

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Publication number Priority date Publication date Assignee Title
US4831636A (en) * 1985-06-28 1989-05-16 Fujitsu Limited Coding transmission equipment for carrying out coding with adaptive quantization
JPH0398318A (ja) 1989-09-11 1991-04-23 Fujitsu Ltd 音声符号化方式
US5457783A (en) * 1992-08-07 1995-10-10 Pacific Communication Sciences, Inc. Adaptive speech coder having code excited linear prediction
JP3557255B2 (ja) * 1994-10-18 2004-08-25 松下電器産業株式会社 Ｌｓｐパラメータ復号化装置及び復号化方法
JPH08237711A (ja) 1995-02-24 1996-09-13 Inter Wave:Kk ボイスページャーおよび中央制御局におけるデータ送出方法
JPH08263099A (ja) * 1995-03-23 1996-10-11 Toshiba Corp 符号化装置
US5799272A (en) * 1996-07-01 1998-08-25 Ess Technology, Inc. Switched multiple sequence excitation model for low bit rate speech compression
US6169970B1 (en) * 1998-01-08 2001-01-02 Lucent Technologies Inc. Generalized analysis-by-synthesis speech coding method and apparatus
US6418147B1 (en) * 1998-01-21 2002-07-09 Globalstar Lp Multiple vocoder mobile satellite telephone system

Also Published As

Publication number Publication date
JP2000091922A (ja) 2000-03-31
DE69922582D1 (de) 2005-01-20
DE69922582T2 (de) 2005-10-06
CN1237073A (zh) 1999-12-01
CN1192656C (zh) 2005-03-09
KR19990088502A (ko) 1999-12-27
US20020069075A1 (en) 2002-06-06
ES2235431T3 (es) 2005-07-01
EP0961264A1 (fr) 1999-12-01
KR100587431B1 (ko) 2006-06-09
US6499008B2 (en) 2002-12-24

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