EP1231726B1 - Système et procédé pour la transmission sans fil de signaux audio numériques - Google Patents

Système et procédé pour la transmission sans fil de signaux audio numériques Download PDF

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Publication number
EP1231726B1
EP1231726B1 EP02001372A EP02001372A EP1231726B1 EP 1231726 B1 EP1231726 B1 EP 1231726B1 EP 02001372 A EP02001372 A EP 02001372A EP 02001372 A EP02001372 A EP 02001372A EP 1231726 B1 EP1231726 B1 EP 1231726B1
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EP
European Patent Office
Prior art keywords
digital audio
audio signal
transmission
audio signals
unit
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
Application number
EP02001372A
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German (de)
English (en)
Other versions
EP1231726A3 (fr
EP1231726A2 (fr
Inventor
Werner c/o Grundig AG Bauerschmidt
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.)
Grundig Multimedia BV
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Grundig Multimedia BV
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Publication date
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Publication of EP1231726A2 publication Critical patent/EP1231726A2/fr
Publication of EP1231726A3 publication Critical patent/EP1231726A3/fr
Application granted granted Critical
Publication of EP1231726B1 publication Critical patent/EP1231726B1/fr
Anticipated expiration legal-status Critical
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04S—STEREOPHONIC SYSTEMS 
    • H04S1/00—Two-channel systems
    • H04S1/007—Two-channel systems in which the audio signals are in digital form

Definitions

  • the present invention relates to system and method for the transmission of digital audio signals.
  • the audio signals are often transmitted in analog form, ie the analog audio signal is modulated in the central unit by means of a modulator of a carrier frequency and transmitted by means of an antenna of the central unit.
  • the external units also have antennas to receive the signal sent from the central unit.
  • the external units also contain a demodulator, with which the audio signal is recovered from the transmission signal.
  • the recovered audio signal is then amplified by means of a power amplifier to z. B. to be reproduced by means of electroacoustic transducer.
  • a digital wireless speaker system known.
  • a plurality of audio signal sources can be connected to a central unit, wherein the audio signal of one of the audio signal sources can be selected.
  • the selected audio signal is converted to a digital data stream and provided with an error correction signal.
  • the digital data stream thus generated is fed to a modulator which modulates the digital data stream to a carrier signal.
  • the transmission signal generated by the modulator is transmitted.
  • the associated external unit receives the transmission signal of the central unit by means of an antenna and demodulates it.
  • the digital audio signal is available in the external unit for further processing.
  • the known digital wireless speaker system has the disadvantage that the digital audio signals of the signal sources must be converted into a uniform format so that they can be processed for wireless transmission. For this it is necessary, for example, that all digital audio signals are converted so that they have a uniform data rate and a uniform coding. Otherwise they can not be processed either in the central unit or in the external unit (s).
  • the advantage of the invention is, on the one hand, that the transparent transmission of the digital audio data allows any digital audio signals present in each coding and / or each data rate to be transmitted from arbitrary audio signal sources.
  • the decoding of the transmitted digital audio signals takes place only in the external units.
  • the carrier frequency used for the transmission of the digital audio signals is changed continuously within a frequency range.
  • the carrier frequency used in each case for the transmission of the digital audio signals is thereby checked immediately before each change to see whether it is disturbed at that moment.
  • control data such as control information, which is required anyway in the system and which are not susceptible to interference, additionally transmitted in addition to the digital audio data. If it is determined during the verification of the control data that they were transmitted without interference, the carrier frequency used for the transmission of the control data is used for the transmission of the digital audio data. At the same time, the carrier frequency used for the transmission of the control data is changed and a renewed check for disturbances takes place.
  • the advantage of the invention is, on the other hand, the fact that a simple system can be achieved by the separate transmission of digital audio data and control data, because the use of time-division multiplexing can be avoided.
  • by checking the carrier frequency used in each case for the transmission of the control data it is achieved that the transmission of the digital audio data takes place without interference.
  • FIG. 1 shows a schematic diagram of an embodiment of a system for the transmission of digital audio signals.
  • the system 1 has a central unit 100 and at least one external unit 200, 300.
  • the central processing unit 100 has inputs for audio signal sources 10, 20, 30, ... 40 with different digital audio signals.
  • the digital audio signals may differ in their data rate and / or their coding.
  • the first audio signal source 10 may be a CD player
  • the second audio signal source 20 may be a DVD player
  • the third audio signal source 30 may be a MP3 coded digital audio signal reproducing apparatus
  • the fourth audio signal source 40 may be an analog-to-digital converter which serves to convert an analog audio signal into a digital audio signal.
  • signal sources can be connected.
  • the digital audio signals are any, known digital audio signals, for example stereo signals, hi-fi signals, surround signals, etc.
  • the audio signal sources 10, 20, 30,... 40 are connected via the inputs of the central unit 100 to a switching unit 110, for example a crossbar switch.
  • the switching unit 110 enables selection of one of the digital audio signals of the audio signal sources 10, 20, 30, ... 40.
  • the selected digital audio signal is supplied to a digital signal processor 120 which prepares the digital audio signal for transmission, e.g. By adding additional synchronous information and / or control data, discussed in greater detail below, to the digital audio signal.
  • the thus prepared digital audio signal is fed to a modulator and high-frequency part 130 which modulates the digital audio signal of a carrier frequency, amplifies and transmits via a connected antenna 135.
  • the central processing unit 100 is controlled by a control device 140, with associated memory 145, which is volatile and / or non-volatile.
  • the control unit 140 may be formed by a microprocessor, for example.
  • a control device 150, 155 is provided. This may be formed, for example, by a remote control receiver 150 and a remote control transmitter 155, which are interconnected via a wireless connection 156 (electromagnetic or optical).
  • the external units 200, 300 each have an antenna 215, 315, a receiving device 210, 310, a decoder 220, 320, which also includes a digital / analog converter, an amplifier 230, 330 and an electroacoustic transducer 240, 340, for example one or more speakers, on.
  • the signal transmitted by the CPU 100 is received by the antennas 215, 315 and receivers 210, 310, decoded by the decoders 220, 320, and converted into an analog audio signal.
  • the analog audio signals are amplified by the amplifiers 230, 330 for playback with the speakers 240, 340.
  • the audio signal may be, for example, a stereophonic audio signal, wherein the one external unit 200 for playback z. B. the right channel is used, whereas the other external unit 300 for playback z. B. the left channel is used.
  • All interfaces between the digital audio signals processing components in the central processing unit 100 are formed digitally, for.
  • the processing of the data formats takes place only at the end of the transmission chain, i. H. Decoding and / or decompression takes place in the external units 100, 200, the transmission there is transparent. This is understood to mean that the wireless transmission 136 of all digital audio signals takes place in the original format.
  • control data may be, for example, rule information such. B. the volume information and information about bass and treble settings for the digital audio signals to be played.
  • the control data is, as described above, transmitted together with the digital audio data and only in the one or more external units 200, 300 processed by z. B. be used to control the amplifier or 230, 330 and regulate.
  • the signals to the external units 200, 300 may also be at a uniform data rate of e.g. 96 kHz and a uniform word width of e.g. 24 bits are converted in order to keep the components of the external units 200, 300 structurally simple.
  • a data rate corresponding to an integer multiple of the data rate of the digital audio signals to be transmitted is selected in the central processing unit.
  • Equalization of the loudspeakers 240, 340 used is possible; this can be done both for the digital signal processing 120 of the central unit 100 and in the external units 200, 300.
  • a microphone whose characteristics are known, other speakers can be measured and thus equalized.
  • an adaptation to the room acoustics is possible.
  • a return channel is provided by means of which the external units 200, 300 control data, for. B. state of the external unit 200, 300, reception quality, etc., can transmit to the central unit 100.
  • the carrier frequency for the return channel may be in a different frequency range than the carrier frequency or the channel for the transmission of the audio data, thereby no time multiplexing with the channel for the audio data is required, whereby the system is simplified.
  • a synchronization is performed which organizes the synchronization of all the external units 200, 300 in order to enable the simultaneous reproduction of the digital audio signals, e.g. B. in stereophonic audio signals, by all external units 200, 300 to ensure.
  • connection 156 between the remote control transmitter 155 and the central unit 100 is bidirectional to z.
  • the system supports multi-room operation.
  • One or more audio sources can be played back simultaneously from different external units in different rooms.
  • FIG. 2 is a diagram of the temporal organization of the transmission of the digital audio signals as well as the control data of the return channel for the system FIG. 1 shown.
  • the system 1 comprises a central processing unit 100, at least one external unit 200, 300 (eg with loudspeakers) and one or more operating units 150, 155.
  • a digital audio data packet AD is sent from the central unit to the external units.
  • an external unit of which there are N pieces in the illustrated example, in each case sends a control data packet KD via the return channel the central unit back.
  • each external unit sends one control packet each. That means with 10 external units 10 frames are needed to transfer the control data of all external units.
  • the so-called frequency-hopping method can be used, in which the data is transmitted alternately in time over different channels (different carrier frequencies).
  • the user data here: digital audio data
  • audible interference This can be prevented in the event that the control data described are not transmitted on the same channel as the user data but lead it in the channel jumps.
  • the control data is lost, a channel assignment is already detected before the user data is transmitted. Their transmission can then be redirected in time to another, free channel.
  • the lost control data is then repeated in one of the following frames since their transmission is not time critical.
  • a repetition of the payload is not readily possible in audio systems, as this is the temporal correlation between the individual playback devices (external units, or speakers) is no longer guaranteed.
  • the described system for the transmission of digital audio data is particularly suitable for the home area, wherein the central unit 100 can take over the role of an audiovisual center, wherein the external units 200, 300 function as wirelessly connected active speakers.

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Circuit For Audible Band Transducer (AREA)
  • Transmitters (AREA)
  • Stereophonic System (AREA)
  • Details Of Audible-Bandwidth Transducers (AREA)
  • Reduction Or Emphasis Of Bandwidth Of Signals (AREA)

Claims (4)

  1. Système pour la transmission sans fil de signaux audio numériques comprenant une unité (100) centrale, un dispositif (110, 150, 155) pour la sélection d'une de plusieurs sources de signaux audio numériques (10, 20, 30,..40), et un dispositif (120, 130, 135), lequel génère un signal d'émission à partir du signal audio numérique sélectionné et l'envoie, et au moins une unité (200 ; 300) externe par rapport à l'unité (100) centrale, laquelle reçoit le signal d'émission,
    caractérisé en ce
    le dispositif (120, 130, 135) laisse non modifié le signal audio numérique sélectionné lors de la génération du signal audio en ce qui concerne le débit de données et/ou le codage, le dispositif (120, 130, 135) ajoute au signal d'émission des informations synchrones et des données de contrôle et/ou des données de réglage spécifiques au signal audio numérique et le dispositif (120, 130, 135) envoie ce signal d'émission.
  2. Système selon la revendication 1,
    caractérisé en ce que
    le dispositif (120, 130, 135), qui envoie le signal audio numérique sélectionné, envoie des informations sur le codage et/ou la compression du signal audio numérique sélectionné, avant qu'il envoie le signal audio numérique sélectionné, et en ce que les informations sur le codage et/ou la compression sont reçues et stockées par au moins une unité (200 ; 300) externe, afin de les utiliser pour un décodage consécutif et/ou une décompression consécutive d'un signal audio numérique reçu.
  3. Procédé pour la transmission sans fil de signaux audio numériques d'une unité (100) centrale à au moins une unité (200 ; 300) externe par rapport à l'unité (100) centrale,
    caractérisé en ce que
    la transmission du signal audio numérique s'effectue sans modification du débit de données et/du codage et des informations de synchronisation et des données de contrôle et/ou des données de réglage spécifiques au signal audio numérique sont ajoutées au signal audio numérique.
  4. Procédé selon la revendication 3,
    caractérisé en ce que
    des informations sur le codage et/la compression du signal audio numérique à transmettre sont transmises avant que le signal audio numérique soit transmis, et en ce que les informations sur le codage et/ou la compression sont reçues et stockées par au moins une unité (200 ; 300) externe, afin de les utiliser pour un décodage consécutif et/ou une décompression consécutive d'un signal audio numérique reçu.
EP02001372A 2001-02-08 2002-01-19 Système et procédé pour la transmission sans fil de signaux audio numériques Expired - Lifetime EP1231726B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10105738 2001-02-08
DE10105738A DE10105738B4 (de) 2001-02-08 2001-02-08 System und Verfahren für die Übertragung von digitalen Audiosignalen

Publications (3)

Publication Number Publication Date
EP1231726A2 EP1231726A2 (fr) 2002-08-14
EP1231726A3 EP1231726A3 (fr) 2008-07-02
EP1231726B1 true EP1231726B1 (fr) 2011-07-27

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ID=7673290

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02001372A Expired - Lifetime EP1231726B1 (fr) 2001-02-08 2002-01-19 Système et procédé pour la transmission sans fil de signaux audio numériques

Country Status (4)

Country Link
EP (1) EP1231726B1 (fr)
AT (1) ATE518386T1 (fr)
DE (1) DE10105738B4 (fr)
ES (1) ES2370615T3 (fr)

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5123015A (en) * 1990-12-20 1992-06-16 Hughes Aircraft Company Daisy chain multiplexer
DE4302428A1 (de) * 1993-01-29 1994-08-04 Sel Alcatel Ag Video-Audio Codierer und Decodierer
JPH09507371A (ja) * 1994-10-17 1997-07-22 フィリップス エレクトロニクス ネムローゼ フェンノートシャップ ワイヤレスデジタル通信システム、無線装置、デジタルスピーカ及びデジタルスピーカ制御装置
WO1997029550A1 (fr) * 1996-02-07 1997-08-14 L.S. Research, Inc. Systeme de haut-parleurs numeriques sans fil
US6466832B1 (en) * 1998-08-24 2002-10-15 Altec Lansing R & D Center Israel High quality wireless audio speakers
WO2000076272A1 (fr) * 1998-12-03 2000-12-14 Audiologic, Incorporated Systeme numerique de haut-parleurs sans fil
DE29908045U1 (de) * 1999-05-05 1999-07-29 Veccom Co., Ltd., Chungli, Taoyuan Drahtlose Übertragungseinrichtung mit einem Lautsprechersystem

Also Published As

Publication number Publication date
ATE518386T1 (de) 2011-08-15
EP1231726A3 (fr) 2008-07-02
ES2370615T3 (es) 2011-12-20
DE10105738B4 (de) 2012-05-24
DE10105738A1 (de) 2002-08-14
EP1231726A2 (fr) 2002-08-14

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