EP1231726B1 - System and method for the wireless transmission of digital audio signals - Google Patents

System and method for the wireless transmission of digital audio signals 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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Prior art keywords
digital audio
audio signal
transmission
audio signals
unit
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German (de)
French (fr)
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EP1231726A2 (en
EP1231726A3 (en
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Werner c/o Grundig AG Bauerschmidt
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Grundig Multimedia BV
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Grundig Multimedia BV
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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)

Abstract

Audio digital transmission system has a central unit, a device to select one of several sources of digital audio signals, a device to send a transparent transmission signal from a chosen digital audio signal and to send it and an external unit to pick up the transmission signal. Coding/data rate for the audio signals is not changed for transmission. Carrier frequency is changed within a frequency range. An Independent claim is also included for a method for transmitting digital audio signals from a central unit to external units.

Description

Die vorliegende Erfindung betrifft System und Verfahren für die Übertragung von digitalen Audiosignalen.The present invention relates to system and method for the transmission of digital audio signals.

Es sind Verfahren und Systeme für die Übertragung von Audiosignalen bekannt, bei denen Audiosignale wiedergegeben werden, die mittels einer drahtlosen Verbindung, z. B. mittels elektromagnetischer Wellen, von einer Zentraleinheit zu externen Einheiten übertragen werden. Dazu sind an der Zentraleinheit beliebige Audiosignalquellen, z. B. CD-Spieler, Rundfunkempfänger usw., angeschlossen, deren Audiosignale von der Zentraleinheit an die externen Einheiten übertragen werden, welche die übertragenen Audiosignale empfangen und für die Wiedergabe beispielsweise mittels Lautsprechern aufbereiten.There are known methods and systems for the transmission of audio signals in which audio signals are reproduced by means of a wireless connection, for. B. by electromagnetic waves, are transmitted from a central unit to external units. These are at the central unit any audio signal sources, eg. As CD player, radio receiver, etc., connected, the audio signals are transmitted from the central unit to the external units which receive the transmitted audio signals and prepare for playback, for example by means of speakers.

Die Übertragung der Audiosignale erfolgt dabei häufig in analoger Form, d. h. das analoge Audiosignal wird in der Zentraleinheit mittels eines Modulators einer Trägerfrequenz aufmoduliert und mittels einer Antenne der Zentraleinheit gesendet. Die externen Einheiten verfügen ebenfalls über Antennen, mit denen sie das von der Zentraleinheit gesendete Signal empfangen. In den externen Einheiten ist darüber hinaus ein Demodulator enthalten, mit dem das Audiosignal aus dem Sendesignal zurückgewonnen wird. Das zurückgewonnene Audiosignal wird anschließend mittels eines Leistungsverstärkers verstärkt, um z. B. mittels elektroakustischer Wandler wiedergegeben zu werden.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.

Die bekannten analogen Übertragungsverfahren weisen jedoch zum einen den Nachteil auf, daß sie für eine qualitativ hochwertige Übertragung, z. B. in HiFi-Qualität, aufwendig sind. Zum anderen weisen diese Übertragungsverfahren den Nachteil auf, daß die Audiosignale der Signalquellen, die häufig in digitaler Form vorliegen, für die Übertragung in analoge Signale umgewandelt werden müssen und in analoger Form übertragen werden. Dies ist aber in der Regel immer mit Einbusen bei der Signalqualität verbunden.However, the known analog transmission method, on the one hand, the disadvantage that they are for a high-quality transmission, z. B. in hi-fi quality, are expensive. On the other hand, these transmission methods have the disadvantage that the audio signals of the signal sources, which are often in digital form, must be converted for transmission into analog signals and transmitted in analog form. However, this is usually always associated with loss of signal quality.

Aus diesem Grund wurden digitale Systeme und Verfahren für die Übertragung von Audiosignale vorgeschlagen. Beispielsweise ist aus der WO 97/29550 A1 ein digitales, drahtloses Lautsprechersystem bekannt. Bei dem bekannten Lautsprechersystem ist es vorgesehen, daß mehrere Audiosignalquellen an eine Zentraleinheit angeschlossen werden können, wobei das Audiosignal einer der Audiosignalquellen ausgewählt werden kann. Das ausgewählte Audiosignal wird in einen digitale Datenstrom verwandelt und mit einem Fehlerkorrektursignal versehen. Der so erzeugte digitale Datenstrom wird einem Modulator zugeführt, der den digitalen Datenstrom einem Trägersignal aufmoduliert. Mittels einer Antenne wird das vom Modulator erzeugte Sendesignal gesendet. Die zugehörige externe Einheit empfängt das Sendesignal der Zentraleinheit mittels einer Antenne und demoduliert es. Somit steht das digitale Audiosignal in der externen Einheit zur weiteren Verarbeitung zur Verfügung.For this reason, digital systems and methods for the transmission of audio signals have been proposed. For example, is from the WO 97/29550 A1 a digital wireless speaker system known. In the known speaker system, it is provided that 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. By means of an antenna, 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. Thus, the digital audio signal is available in the external unit for further processing.

Das bekannte digitale, drahtlose Lautsprechersystem weist aber zum einen den Nachteil auf, daß die digitalen Audiosignale der Signalquellen in ein einheitliches Format gewandelt werden müssen, damit sie für die drahtlose Übertragung verarbeitet werden können. Dazu ist es beispielsweise nötig, daß alle digitalen Audiosignale so umgewandelt werden, daß sie eine einheitliche Datenrate sowie eine einheitliche Codierung aufweisen. Anderenfalls können sie weder in der Zentraleinheit noch in der oder den externen Einheiten verarbeitet werden.However, 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).

Zum andren tritt der Nachteil auf, daß die für die Übertragung von Audiosignalen üblicherweise zur Verfügung stehenden Frequenzbereiche, z. B. im Bereich um
2 GHz, gerade im häuslichen Bereich stark belegt sind, weshalb es bei der Übertragung der digitalen Audiosignale häufig zu Störungen kommen kann, die bei der Übertragung von Audiosignalen besonders störend wirken, da diese deutlich zu hören sind. Der Grund dafür ist darin zu sehen, daß die Audiosignale fehlerfrei in Echtzeit übertragen werden müssen, um hörbare Störeffekte zu vermeiden.On the other hand, there is the disadvantage that the frequency ranges commonly available for the transmission of audio signals, for. B. in the area around
2GHz, especially in the domestic area are heavily occupied, which is why it can often interfere with the transmission of digital audio signals, which are particularly disturbing in the transmission of audio signals, as they are clearly heard. The reason for this is that the audio signals must be transmitted without errors in real time in order to avoid audible interference effects.

Es ist daher Aufgabe der vorliegenden Erfindung, Systeme und Verfahren für die Übertragung von Audiosignalen anzugeben, welche eine ungestörte Übertragung von digitalen Audiosignalen ermöglichen, wobei die digitalen Audiosignale beliebige Datenformate aufweisen können.It is therefore an object of the present invention to provide systems and methods for the transmission of audio signals, which allow undisturbed transmission of digital audio signals, wherein the digital audio signals may have any data formats.

Bei der vorliegenden Erfindung wird diese Aufgabe durch die Merkmale der nebengeordneten Ansprüche gelöst.In the present invention, this object is solved by the features of the independent claims.

Dabei wird zum einen von der Überlegung ausgegangen, daß die Übertragung der digitalen Audiosignale transparent erfolgt, d. h. die Codierung und/oder Datenrate der digitalen Audiosignale wird für die Übertragung nicht verändert.It is based on the one hand by the consideration that the transmission of the digital audio signals is transparent, d. H. the coding and / or data rate of the digital audio signals is not changed for the transmission.

Der Vorteil der Erfindung ist zum einen darin zu sehen, daß es die transparente Übertragung der digitalen Audiodaten erlaubt, beliebige in jeder Codierung und/oder jeder Datenrate vorliegende digitale Audiosignale von beliebigen Audiosignalquellen zu übertragen. Die Decodierung der übertragenen digitalen Audiosignale erfolgt dabei erst in den externen Einheiten.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.

Bei einer vorteilhaften Weiterbildung wird der für die Decodierung der digitalen Audiosignale in den externen Einheiten benötigte Decoder in Form von Software erst vor der Übertragung der digitalen Audiosignale von der Zentraleinheit zu der oder den externen Einheiten übertragen.In an advantageous development of the decoder required for the decoding of the digital audio signals in the external units in the form of Transfer software before transferring the digital audio signals from the central processing unit to the external device (s).

Der Vorteil der Weiterbildung ist darin zu sehen, daß das erfindungsgemäße System dadurch weiter flexibilisiert wird, da es auf diese Weise möglich ist, digitale Audiosignale mittels der externen Einheiten wiederzugeben, deren Codierung in der externen Einheit zuvor nicht bekannt gewesen istThe advantage of the development is the fact that the system according to the invention is further made more flexible, since it is possible in this way to reproduce digital audio signals by means of the external units whose coding in the external unit was previously unknown

Zum anderen wird bei der Erfindung von der Überlegung ausgegangen, daß die für die Übertragung der digitalen Audiosignale verwendete Trägerfrequenz innerhalb eines Frequenzbereichs fortlaufend geändert wird. Die für die Übertragung der digitalen Audiosignale jeweils verwendete Trägerfrequenz wird dabei unmittlebar vor jeder Änderung daraufhin überprüft, ob sie in diesem Moment gestört ist. Dazu werden Kontrolldaten, wie Regelungsangaben, die im System ohnehin benötigt werden und die wenig störanfällig sind, zusätzlich neben den digitalen Audiodaten übertragen. Wird bei der Überprüfung der Kontrolldaten festgestellt, daß diese störungsfrei übertragen wurden, wird für die Übertragung der digitalen Audiodaten die Trägerfrequenz verwendet, die zuvor für die Übertragung der Kontrolldaten verwendet wurde. Gleichzeitig wird auch die für die Übertragung der Kontrolldaten verwendete Trägerfrequenz geändert und eine erneute Überprüfung auf Störungen erfolgt.On the other hand, it is assumed in the invention of the consideration that 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. For this purpose, 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.

Der Vorteil der Erfindung ist zum anderen darin zu sehen, daß durch die getrennte Übertragung von digitalen Audiodaten und Kontrolldaten ein einfaches System erreicht werden kann, weil die Verwendung von Zeitmultiplex vermieden werden kann. Zusätzlich wird durch die Überprüfung der jeweils für die Übertragung der Kontrolldaten benutzten Trägerfrequenz auf Störungen erreicht, daß die Übertragung der digitalen Audiodaten störungsfrei erfolgt.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. In addition, 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.

Weitere Vorteile der vorliegenden Erfindung ergeben sich aus den abhängigen Ansprüchen sowie der nachfolgenden Beschreibung einer Ausführungsform eines erfindungsgemäßen Systems anhand von Figuren.Further advantages of the present invention will become apparent from the dependent claims and the following description of an embodiment of a system according to the invention with reference to figures.

Es zeigt:

Fig. 1
ein Prinzipschaltbild einer Ausführungsform eines Systems für die Übertragung von digitalen Audiosignalen, und
Fig. 2
ein Diagramm der zeitlichen Organisation der Übertragung der digitalen Audiosignale sowie der Kontrolldaten in dem System nach Fig. 1.
It shows:
Fig. 1
a schematic diagram of an embodiment of a system for the transmission of digital audio signals, and
Fig. 2
a diagram of the temporal organization of the transmission of the digital audio signals and the control data in the system according to Fig. 1 ,

Zur Erleichterung des Verständnisses der vorliegenden Erfindung sind in den Figuren nur die Bestandteile der Ausführungsform dargestellt, die im Zusammenhang mit der Erfindung von Bedeutung sind.For ease of understanding of the present invention, only the components of the embodiment which are significant in connection with the invention are shown in the figures.

Figur 1 zeigt ein Prinzipschaltbild einer Ausführungsform eines Systems für die Übertragung von digitalen Audiosignalen. Das System 1 weist eine Zentraleinheit 100 sowie mindestens eine externe Einheit 200, 300 auf. 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.

Die Zentraleinheit 100 weist Eingänge für Audiosignalquellen 10, 20, 30, ... 40 mit unterschiedlichen digitalen Audiosignalen auf. Die digitalen Audiosignale können sich in ihrer Datenrate und/oder ihrer Codierung unterscheiden. Beispielsweise kann die erste Audiosignalquelle 10 ein CD-Spieler sein, die zweite Audiosignalquelle 20 kann ein DVD-Spieler sein, die dritte Audiosignalquelle 30 kann ein Wiedergabegerät für MP3-codierte digitale Audiosignale sein, und die vierte Audiosignalquelle 40 kann ein Analog/Digital-Wandler sein, der dazu dient, ein analoges Audiosignal in ein digitales Audiosignal zu wandeln. Weitere, nicht dargestellte, Signalquellen sind anschließbar. Bei den digitalen Audiosignalen handelt es sich um beliebige, bekannte digitale Audiosignale, beispielsweise Stereosignale, HiFi-Signale, Surround-Signale usw.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. For example, 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, and 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. Further, not shown, 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.

Die Audiosignalquellen 10, 20, 30, ... 40 sind über die Eingänge der Zentraleinheit 100 mit einer Schalteinheit 110 verbunden, beispielsweise einem Kreuzschienenschalter. Die Schalteinheit 110 ermöglicht die Auswahl eines der digitalen Audiosignale der Audiosignalquellen 10, 20, 30, ... 40. Das ausgewählte digitale Audiosignal wird einer digitalen Signalverarbeitung 120 zugeführt, welche das digitale Audiosignal für die Übertragung vorbereitet, z. B. indem sie zusätzliche Synchroninformation und/oder Kontrolldaten, die unten näher erläutert werden, zum digitalen Audiosignal hinzufügt. Das derart vorbereitete digitale Audiosignal wird einem Modulator und Hochfrequenzteil 130 zugeführt, welcher das digitale Audiosignal einer Trägerfrequenz aufmoduliert, verstärkt und über eine angeschlossene Antenne 135 sendet. Die Zentraleinheit 100 wird von einer Steuereinrichtung 140, mit zugehörigem Speicher 145, der flüchtig und/oder nichtflüchtig ist, gesteuert. Die Steuereinheit 140 kann beispielsweise von einem Mikroprozessor gebildet werden. Um einem Benutzer die Bedienung zu ermöglichen, z. B. um eine der Audiosignalquellen 10, 20, 30, ... 40 auszuwählen, ist eine Steuereinrichtung 150, 155 vorgesehen. Diese kann beispielsweise von einem Fernbedienungsempfänger 150 und einem Fernbedienungsgeber 155, die über eine drahtlose Verbindung 156 (elektromagnetisch oder optisch) miteinander verbunden sind, gebildet werden.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. To allow a user to operate, for. For example, to select one of the audio signal sources 10, 20, 30,... 40, 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).

Die externen Einheiten 200, 300 weisen jeweils eine Antenne 215, 315, ein Empfangseinrichtung 210, 310, einen Decoder 220, 320, der auch einen Digital/Analog-Wandler enthält, einen Verstärker 230, 330 und einen elektroakustischen Wandler 240, 340, beispielsweise einen oder mehrere Lautsprecher, auf. Das von der Zentraleinheit 100 gesendete Signal wird von den Antennen 215, 315 und Empfangseinrichtungen 210, 310 empfangen, von den Decodern 220, 320 decodiert und in ein analoges Audiosignal gewandelt.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.

Die analogen Audiosignale werden von den Verstärkern 230, 330 für die Wiedergabe mit den Lautsprechern 240, 340 verstärkt. Im dargestellten Beispiel kann es sich bei dem Audiosignal beispielsweise um ein stereophones Audiosignal handeln, wobei die eine externe Einheit 200 für die Wiedergabe z. B. des rechten Kanals verwendet wird, wohingegen die andere externe Einheit 300 für die Wiedergabe z. B. des linken Kanals verwendet wird.The analog audio signals are amplified by the amplifiers 230, 330 for playback with the speakers 240, 340. In the example shown, 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.

Alle Schnittstellen zwischen den die digitalen Audiosignale verarbeitenden Komponenten in der Zentraleinheit 100 sind digital ausgebildet, z. B. nach einem der Standards 12S, S/PDIF, IEEE1394 etc. Die Bearbeitung der Datenformate erfolgt erst am Ende der Übertragungskette, d. h. Decodierung und/oder Dekomprimierung erfolgt in den externen Einheiten 100, 200, die Übertragung dorthin ist transparent. Darunter wird verstanden, daß die drahtlose Übertragung 136 aller digitalen Audiosignale im Ursprungsformat erfolgt.All interfaces between the digital audio signals processing components in the central processing unit 100 are formed digitally, for. For example, according to one of the standards 12S, S / PDIF, IEEE1394, etc. 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.

Es ist ebenfalls möglich, bei vorgegebener Bandbreite für die Übertragung, entweder einen Kanal mit hoher Datenrate (z. B. 2x16 bit PCM) oder mehrere komprimierte Kanäle (komprimiert z. B. mit MP3, AC3, AAC usw.) gleichzeitig zu übertragen.It is also possible, for a given transmission bandwidth, to transmit either a high data rate channel (eg 2x16 bit PCM) or several compressed channels (compressed eg MP3, AC3, AAC, etc.) simultaneously.

Werden digitale Audiosignale von der Zentraleinheit 100 übertragen, deren Codierung und/oder Kompression der oder den externen Einheiten 200, 300 nicht bekannt ist, kann eine Übertragung des Decoders und/oder Dekopressors in Form entsprechender Software zu der oder den externen Einheiten 200, 300 zu Beginn der Übertragung erfolgen. Die übertragene Software wird dann in einem Speicher des oder der Decoder 220, 320 in der oder den externen Einheiten 200, 300 gespeichert und für die anschließende Decodierung und/oder Dekompression verwendet. Damit können auch neue Codierverfahren und/oder Kompressionsverfahren nachträglich in den externen Einheiten 200, 300 verwendet werden.If digital audio signals are transmitted by the central processing unit 100 whose coding and / or compression of the external unit or units 200, 300 is not known, transmission of the decoder and / or decopressor in the form of appropriate software to the external unit (s) 200, 300 may take place Start of the transfer takes place. The transmitted software is then stored in a memory of the decoder 220, 320 in the external unit (s) 200, 300 and used for subsequent decoding and / or decompression. Thus, new coding methods and / or compression methods can also be used subsequently in the external units 200, 300.

Bei den oben bereits erwähnten Kontrolldaten kann es sich beispielsweise um Regelinformation, wie z. B. die Lautstärkeinformation sowie Informationen über Baß- und Höheneinstellungen für die wiederzugebenden digitalen Audiosignale handeln. Die Kontrolldaten werden, wie oben beschrieben, zusammen mit den digitalen Audiodaten übertragen und erst in der oder den externen Einheiten 200, 300 verarbeitet, indem sie z. B. dazu verwendet werden, den oder die Verstärker 230, 330 anzusteuern und zu regeln.The above-mentioned 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.

Die Signale zu den externen Einheiten 200, 300 können auch auf eine einheitliche Datenrate von z.B. 96 kHz sowie eine einheitliche Wortbreite von z.B. 24 Bit gewandelt werden, um die Bestandteile der externen Einheiten 200, 300 baulich einfach halten zu können. Allgemein wird in der Zentraleinheit eine Datenrate gewählt, die einem ganzahligen Vielfachen der Datenrate der zu übertragenden digitalen Audiosignale entspricht.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. Generally, 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.

Eine Entzerrung der verwendeten Lautsprecher 240, 340 ist möglich, dies kann sowohl der digitalen Signalverarbeitung 120 der Zentraleinheit 100, als auch in den externen Einheiten 200, 300 erfolgen. Über ein Mikrofon, dessen Charakteristik bekannt ist, können andere Lautsprecher eingemessen und somit entzerrt werden. Weiterhin ist damit eine Anpassung an die Raumakustik möglich.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. Furthermore, an adaptation to the room acoustics is possible.

Ebenfalls ist ein Rückkanal vorgesehen, mittels dem die externen Einheiten 200, 300 Kontrolldaten, z. B. Zustand der externen Einheit 200, 300, Empfangsqualität usw., an die Zentraleinheit 100 übermitteln können. In der Regel ist dazu nur eine geringe Datenrate erforderlich. Die Trägerfrequenz für den Rückkanal kann in einem anderen Frequenzbereich liegen als Trägerfrequenz bzw. der Kanal für die Übertragung der Audiodaten, dadurch ist kein Zeitmultiplex mit dem Kanal für die Audiodaten erforderlich, wodurch das System vereinfacht wird.Also, 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. As a rule, only a low data rate is required. 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.

Weiterhin wird, wie oben im Zusammenhang mit der Zentraleinheit 100 beschrieben eine Synchronisation vorgenommen, welche die Synchronisation aller externen Einheiten 200, 300 organisiert, um die gleichzeitige Wiedergabe der digitalen Audiosignale, z. B. bei stereophonen Audiosignalen, durch alle externen Einheiten 200, 300 zu gewährleisten.Furthermore, as described above in connection with the central processing unit 100, 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.

Auch die Verbindung 156 zwischen Fernbedienungsgeber 155 und Zentraleinheit 100 ist bidirektional, um z. B. Informationen über die Einstellungen des Systems oder Textinformationen von den Audioquellen 10, 20, 30, ... 40 abfragen und auf einer Anzeige der Fernbedienung anzeigen zu können.The connection 156 between the remote control transmitter 155 and the central unit 100 is bidirectional to z. B. information about the settings of the system or text information from the audio sources 10, 20, 30, ... 40 query and display on a display of the remote control can.

Das System unterstützt Mehrraumbetrieb. Es können eine oder mehrere Audioquellen gleichzeitig von verschiedenen externen Einheiten in unterschiedlichen Räumen wiedergegeben werden. Durch die Verwendung jeweils einer drahtlosen Fernbedienung in den einzelnen Räumen ist ein unabhängiger Zugriff auf die an der Zentraleinheit angeschlossenen Quellen möglich.The system supports multi-room operation. One or more audio sources can be played back simultaneously from different external units in different rooms. By using a wireless remote control in each room, independent access to the sources connected to the central unit is possible.

In Figur 2 ist ein Diagramm der zeitlichen Organisation der Übertragung der digitalen Audiosignale sowie der Kontrolldaten des Rückkanals für das System nach Figur 1 dargestellt.In 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.

Wie im Zusammenhang mit der Figur 1 oben beschrieben, weist das System 1 eine Zentraleinheit 100, mindestens eine externe Einheit 200, 300 (z.B. mit Lautsprechern) und eine oder mehrere Bedieneinheiten 150, 155 auf.As related to the FIG. 1 As described above, 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.

Im dargestellten Beispiel wird innerhalb jedes von N Rahmen ein digitales Audiodatenpaket AD von der Zentraleinheit zu den externen Einheiten gesendet. Jeweils eine externe Einheit, von denen es im dargestellten Beispiel N-Stück gibt, sendet jeweils ein Kontrolldatenpaket KD über den Rückkanal an die Zentraleinheit zurück. Innerhalb der dargestellten N aufeinanderfolgenden Rahmen sendet jede externe Einheit jeweils ein Kontrollpaket. D.h. bei 10 externen Einheiten werden 10 Rahmen benötigt um die Kontrolldaten aller externen Einheiten zu übertragen.In the illustrated example, within each of N frames, a digital audio data packet AD is sent from the central unit to the external units. In each case 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. Within the illustrated N consecutive frames, 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.

Wird das System in Frequenzbereichen betrieben, die nicht ausschließlich für dieses System definiert sind, ist mit Kollisionen mit Fremdsystemen zu rechnen. Um diese Kollisionen zu verhindern, kann das sogenannte Frequency-hopping-Verfahren verwendet werden, bei dem die Daten zeitlich abwechselnd über unterschiedliche Kanäle (unterschiedliche Trägerfrequenzen) übertragen werden. Kollisionen werden allerdings erst erkannt, wenn die Nutzdaten (hier: digitale Audiodaten) bereits verloren gegangen sind, wodurch sich hörbare Störungen ergeben. Dies läßt sich für den Fall verhindern, daß die beschriebenen Kontrolldaten nicht auf dem gleichen Kanal wie die Nutzdaten übertragen werden sondern diesen bei den Kanalsprüngen voreilen. Damit wird bei Verlust der Kontrolldaten eine Kanalbelegung bereits erkannt bevor die Nutzdaten übertragen werden. Deren Übertragung kann dann noch rechtzeitig auf einen anderen, freien Kanal umgeleitet werden.If the system is operated in frequency ranges that are not exclusively defined for this system, collisions with external systems are to be expected. In order to prevent these collisions, the so-called frequency-hopping method can be used, in which the data is transmitted alternately in time over different channels (different carrier frequencies). However, collisions are only recognized when the user data (here: digital audio data) has already been lost, resulting in 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. Thus, if 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.

Die verlorengegangenen Kontrolldaten werden dann in einem der folgenden Rahmen wiederholt, da deren Übertragung nicht zeitkritisch ist. Eine Wiederholung der Nutzdaten ist bei Audiosystemen nicht ohne weiteres möglich, da dadurch die zeitliche Korrelation zwischen den einzelnen Wiedergabegeräten (externe Einheiten, bzw. Lautsprecher) nicht mehr gewährleistet ist.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.

Das beschriebene System für die Übertragung von digitalen Audiodaten eignet sich besonders für den Heimbereich, wobei die Zentraleinheit 100 die Rolle eines audiovisuellen Zentrums übernehmen kann, wobei die externen Einheiten 200, 300 als drahtlos verbundene Aktivlautsprecher fungieren.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.

Claims (4)

  1. System for the wireless transmission of digital audio signals having a central unit (100), having a device (110, 150, 155) for the selection of one or more digital audio signal sources (10, 20, 30, ... 40), and a device (120, 130, 135) which takes the selected digital audio signal and produces a transmission signal and transmits the latter, and also at least one unit (200; 300) which is external to the central unit (100) and which receives the transmission signal,
    characterized
    in that the device (120, 130, 135) leaves the selected digital audio signal unchanged in terms of data rate and/or coding when producing the transmission signal, the device (120, 130, 135) adds to the transmission signal synchronous information and control and/or regulatory data relating to the digital audio signal, and the device (120, 130, 135) transmits this transmission signal.
  2. System according to Claim 1,
    characterized
    in that the device (120, 130, 135) which transmits the selected digital audio signal transmits information about the coding and/or compression of the selected digital audio signal before it transmits the selected digital audio signal, and in that the information about the coding and/or compression is received and stored by at least one external unit (200; 300) in order to use it for subsequent decoding and/or decompression of a received digital audio signal.
  3. Method for the wireless transmission of digital audio signals from a central unit (100) to at least one unit (200; 300) which is external to the central unit (100),
    characterized
    in that the digital audio signal is transmitted without altering the data rate and/or coding and the digital audio signal has synchronization information and control and/or regulatory data relating to the digital audio signal added to it for the transmission.
  4. Method according to Claim 3,
    characterized
    in that information about the coding and/or compression of the digital audio signal that is to be transmitted is transmitted before the digital audio signal is transmitted, and in that the information about the coding and/or compression is received and stored by at least one external unit (200; 300) in order to use it for subsequent decoding and/or decompression of a received digital audio signal.
EP02001372A 2001-02-08 2002-01-19 System and method for the wireless transmission of digital audio signals Expired - Lifetime EP1231726B1 (en)

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DE10105738 2001-02-08
DE10105738A DE10105738B4 (en) 2001-02-08 2001-02-08 System and method for the transmission of digital audio signals

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US5123015A (en) * 1990-12-20 1992-06-16 Hughes Aircraft Company Daisy chain multiplexer
DE4302428A1 (en) * 1993-01-29 1994-08-04 Sel Alcatel Ag Video-audio coder and decoder
WO1996012355A2 (en) * 1994-10-17 1996-04-25 Philips Electronics N.V. A wireless digital communication system, a radio apparatus, a digital speaker, and a digital speaker controlling apparatus
EP0880827A1 (en) * 1996-02-07 1998-12-02 L.S. Research, Inc. Digital wireless speaker system
US6466832B1 (en) * 1998-08-24 2002-10-15 Altec Lansing R & D Center Israel High quality wireless audio speakers
WO2000076272A1 (en) * 1998-12-03 2000-12-14 Audiologic, Incorporated Digital wireless loudspeaker system
DE29908045U1 (en) * 1999-05-05 1999-07-29 Veccom Co Wireless transmission device with a speaker system

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EP1231726A2 (en) 2002-08-14
EP1231726A3 (en) 2008-07-02
ES2370615T3 (en) 2011-12-20
DE10105738B4 (en) 2012-05-24
ATE518386T1 (en) 2011-08-15

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