EP1499158A2 - Système de reproduction audio avec canal de retour pour les données - Google Patents

Système de reproduction audio avec canal de retour pour les données Download PDF

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Publication number
EP1499158A2
EP1499158A2 EP04013029A EP04013029A EP1499158A2 EP 1499158 A2 EP1499158 A2 EP 1499158A2 EP 04013029 A EP04013029 A EP 04013029A EP 04013029 A EP04013029 A EP 04013029A EP 1499158 A2 EP1499158 A2 EP 1499158A2
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EP
European Patent Office
Prior art keywords
data
signal
audio
audio signal
sound
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.)
Withdrawn
Application number
EP04013029A
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German (de)
English (en)
Other versions
EP1499158A3 (fr
Inventor
Wilfried Platzer
Christian Bock
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.)
TDK Micronas GmbH
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TDK Micronas GmbH
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Filing date
Publication date
Application filed by TDK Micronas GmbH filed Critical TDK Micronas GmbH
Publication of EP1499158A2 publication Critical patent/EP1499158A2/fr
Publication of EP1499158A3 publication Critical patent/EP1499158A3/fr
Withdrawn legal-status Critical Current

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04S—STEREOPHONIC SYSTEMS 
    • H04S7/00—Indicating arrangements; Control arrangements, e.g. balance control
    • H04S7/30—Control circuits for electronic adaptation of the sound field
    • H04S7/301—Automatic calibration of stereophonic sound system, e.g. with test microphone
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R2420/00—Details of connection covered by H04R, not provided for in its groups
    • H04R2420/07—Applications of wireless loudspeakers or wireless microphones

Definitions

  • the invention relates to an audio playback system with a data return channel with the above conceptual features of Patent claim 1 or to a method for reproducing at least one audio signal.
  • an audio reproduction system which is an audio signal providing device for Providing an acoustically reproduced sound signal, a transmitter-side data providing device for Providing data for control and / or Monitoring purposes and a speaker to play having an acoustic sound signal as an audio signal.
  • a sound signal is output via the loudspeaker, in which besides usual music signals data or a corresponding data signal are mixed in such a way that for if necessary, a person picking up the sound waves Pseudo-noise code is perceptible.
  • This Audio playback system serves to from a central Computer from data information to LCD displays on one Transfer supermarket shelf, taking on the LCD displays Data and prices for corresponding products on the shelf according to the transmitted data.
  • Audio playback system alarms received from a sensor be generated, encoded as data and by means of Transmit sound waves to a central alarm system.
  • the Receiver device which one such mixed with data Sound signal receives, has a receiver side Data processing device for processing in the Sound signal contained data and trigger accordingly actions to be performed.
  • the transmitter side and the receiver-side facilities structurally similar built to enable two-way communication enable.
  • the transmitter-side devices also each have one internal noise level monitoring device for monitoring the local noise level, with the noise level too Time points is detected when the corresponding facility does not transmit data to the remote device.
  • the Facilities are thus either on the one hand in a receiving or local noise level receiving state or otherwise in one data to one remote device transmitting state.
  • the audio signal is for example, a signal, as is the case with conventional applications a surround sound system over one or more Speaker is transmitted.
  • the audio signal from an audio CD, a DVD or a Radio receiver available.
  • the audio signal thus mixed with a data signal becomes from a microphone with a downstream decoder which receives the data from the pure audio signal and from Separate ambient noise.
  • Areas of application are For example, toys in the form of a figure, which depending on the data signal.
  • the data signal It corresponds to the directional instructions, which are parallel to are matched to a screen movie.
  • Be according to another scope Mobile phones via their microphone with information about the Powered display on the mobile phone display, which via a public address system can be transmitted in the environment.
  • data signals are thus as sound waves transmitted to a remote device to in the remote device to be carried out accordingly Trigger actions.
  • Audio playback systems usually have a unidirectional Data connection from a data source via required intermediate devices, e.g. Amplifier, to one or several speakers as terminals or data sinks on, which the audio signals corresponding sound waves radiate.
  • Ggfs. secured of upstream devices required control data for downstream devices in the same direction as broadcasting or music distribution (Streaming) and can be used especially in digital methods transmitted together with the user data stream.
  • an individual case with such streaming methods is also a return channel to control the functionality of upstream Equipment required. Although such a return channel for Control and tax purposes a much lower Data rate as the downlink requires is the structural Effort big, which is why usually for cost reasons is waived.
  • upstream data source such as a computer, a CD player or to control a radio receiver.
  • upstream Devices such as amplifiers, CD players or Radio receivers, which may be further from the Handset are located to control.
  • the object of the invention is to provide an improved Propose audio playback system, which with low structural effort provides a data return channel.
  • This task is accomplished by an audio playback system with the Features of claim 1 or by a method for Playing an audio signal with the characteristics of the Patent claim 8 solved.
  • Such an audio playback system has an audio signal providing device to provide a Audio signal as a payload audio signal, for example one Sound from a video film or a compact disc (CD), a data providing device for providing Data for control and / or verification purposes, one Mixer for mixing together the useful audio signal and the data to a common audio signal and at least a speaker for playing the from the common Audio signal generated acoustic sound signal.
  • Audio signal is widely interpreted and includes Signal components whose associated sound waves are in for People and animals are perceptible and imperceptible Area lie.
  • the receiver device is a microphone for receiving the mixed or common sound signal. Sufficient is a microphone in the extreme case, which only sound waves in the frequency domain of the data signal components receives.
  • the signal received by the microphone is in implemented in the usual way and a receiver side Data processing device for processing in the common sound signal containing data and for triggering supplied according to actions to be performed.
  • the Speaker and / or the signal transmission in the direction of Speaker from an upstream facility of the To enable audio playback system is the Data processing device for monitoring the Playback conditions formed in the manner of a return channel.
  • additional data for verification purposes can also directly mixed control data into the payload audio signals become.
  • transmitter-side monitoring or control data as data in the Mixed audio signal and then from the speaker as Transmit sound waves.
  • the from the receiver device received sound waves are then analyzed and the supplied to further transmitter-side components, so that transmitter side e.g. a check can be made whether the original data is correctly forwarded and were transferred.
  • a corresponding method for playing at least of an audio signal is corresponding to the at least one Audio signal provided for playback, at least one Data value provided as data, the sound signal and the Data value is mixed, the mixed signal is over at least one speaker as an acoustic signal output and the acoustic signal is from a Receiver device receive, whereupon the receiver side in the received mixed signal data for Trigger accordingly actions to be performed are processed.
  • the receiver side in the received mixed signal data for Trigger accordingly actions to be performed are processed.
  • the receiver side in The data contained in the received sound waves for monitoring or controlling the reproduction conditions at the transmitter side Facilities and process steps taken into account.
  • An implementation of the audio playback system or the method is especially used in a surround sound system with or in a computer or video / DVD player Play multi-dimensional or multi-channel audio signals advantageous.
  • Such surround sound systems will be usually for playing the sound of films (videos) used.
  • the data providing device to the sender-side providing and, if necessary, also Mixing up the data and the Data processing device for the receiver side Processing the data received via the sound waves be formed by an integral device.
  • Radio interface which with the audio signal providing device and / or the mixing device for Transfer the audio signal and data to the speaker are coupled via a radio interface.
  • the radio interface will be by means of the microphone Sound waves with disturbed or missing data so that via the feedback to the transmitter-side facilities troubleshooting can be executed or initiated.
  • another radio channel can be selected or via a Display device to the operator of the audio playback system to be given an instruction.
  • the mixing device is expediently psychoacoustic Encoding and merging the data in such a way trained that the data of a human or animal listeners are not consciously perceived to be one to allow undisturbed listening pleasure.
  • the Receiver means the sound waves, i. one corresponding microphone, in a central location or preferably arranged at the place where the person which are the ones emitted by the speakers Sound waves are heard. This can be an adaptation of the individual Audio signals for the various speakers such be made that at the place of the hearing person balanced and from all sides overlooking a Unit volume even audio signal is heard.
  • the spatially and structurally separate from the audio signal providing device be arranged have a Signal processing device for in particular payload audio signals and expediently the mixing device for Providing the mixed audio signal in the Speaker on.
  • the method is with such an audio playback system especially when using a variety of speakers an audio signal preprocessing possible which Arrangement error of each speaker relative to each other or a specific position of a hearing person balance out.
  • an audio signal preprocessing possible which Arrangement error of each speaker relative to each other or a specific position of a hearing person balance out.
  • dynamic changes of the individual Audio signals are also interfering interference formations by such an audio signal preprocessing compensated.
  • error messages which one of the Be transmitted to the audio playback system operator is, in addition to the use of a display device, in particular a display device of the Audio playback system or an overlay of instructions in the image signal of a television, also an acoustic Transmission of error messages via at least one of the Loudspeaker possible.
  • this is at a Variety of available speakers determines which of the Speakers due to the returned data an optimal or output the best possible sound signal to over at least this speaker also acoustic Output error messages.
  • the data source For a home audio system, the data source, For example, a computer (PC), CD player (CD: Compact Disk) or radio as a music source, the audio data in analog or digital form. Is it necessary to check the status of the Data sink, a wireless speaker or an active one Speakers, learn to determine if this present, ready, switched on and problem-free offers it is about, such information in the from the speaker output audio signal as data with. Because the Data rate is very small, the return data can be processed be that through a signal processing device in the normal audio signal inside or outside of the Listening area can be hidden. In the device of Data source is a microphone that controls the audio signals receives, and a signal processing device, which the data from the audio signal recovered, formed.
  • a signal processing device In the device of Data source is a microphone that controls the audio signals receives, and a signal processing device, which the data from the audio signal recovered, formed.
  • IR infrared signal
  • a data processing device also called Mixer M is used, an input device IN as User input unit and to the Data processing device M connected speakers L4 and from a receiver device in the form of a to the Computer PC directly connected microphone MIC.
  • the computer PC serves as an audio signal source and supplies for example, audio signals in the form of music.
  • the Audio signal is in the manner of a data streaming over a Interface to the data and audio signal conditioning device transferred with the mixer M.
  • These Transmission takes place unidirectionally, in detail Audio signals, response signals and data are transmitted.
  • the Transmission can be done in the usual way, in particular electromagnetically electrical or optical. there can the interface according to particular as Radio interface, cable-based interface or optical Be formed interface.
  • the data and audio signal conditioning device with the mixer device M receives this data stream in particular the audio signal r as a useful audio signal and prepares the audio signal as entire or mixed audio signal for playback via the connected speaker L4.
  • the Data and audio signal conditioning device with the Mixer M Data d from the User input device IN.
  • the user input device IN for example, a known per se remote control be how they operate televisions, music systems and standalone surround sound systems is known.
  • these data become d or a corresponding data signal mixed into the audio signal r.
  • the interference is expediently psychoacoustic Criteria such that a listener, while the acoustically reproduced audio signals sw, but not the acoustically reproduced data signals sd aware perceives.
  • the sound waves are sw + sd with the audio signal component sw and the data signal component sd received and that as a general Data processing device serving computer PC as received sound signal supplied.
  • the Data processing device PC the data d, the in the mixing device M mixed into the sound signal r or were encoded from the received sound signal sw + sd pulled out and decoded.
  • the received data d instead of, if necessary. perform actions to be performed.
  • the decoding can be done by itself be supported known correlation method.
  • the Evaluation may be subject to various purposes. For example, it can be determined with the help of the evaluation whether the speakers are L4 at all or right function. Also, incorrect positioning of the Speakers are taken into account. With the wrong ones Positioning and use of a stereo microphone can it is e.g. to swap a right and a left act as a speaker to be arranged, which then as Corrective action transmitted the other sound signal to get. It is also possible to correct interferences, which due to incorrect positioning or structural different speakers result.
  • Another Exemplary correction option consists in the control different speakers with each individual Signal intensity to a speaker farther from one central location is removed as another speaker, with a higher signal intensity to control. such Corrective actions may preferably be performed automatically by the Audio playback system, in particular automatically by the Data processing device or Data providing device PC are made.
  • Such communications can for example, via the display of the computer PC, via a Screen of a connected TV, special Display elements on the data and sound processing device or acoustically via the speakers to be provided.
  • Fig. 2 shows an embodiment in which as a sound signal providing device S a music system with a Music source, such as a CD player is used.
  • the sound signal providing device S has a radio interface transmitter TX which is connected to Transmission of sound signals r and a data signal d via a radio interface to radio interface receivers RX4 serves.
  • the radio interface receivers RX4 receive the Sound signal r and pass this to a speaker L4 further, which with an upstream Pre-processing device received the corresponding Sound signal r as useful audio signal with the data signal d mixed or encoded and outputs a sound signal sw + sd, which Tonsignalanmaschine sw as Nutz-Tonsignalanmaschine and Contains data signal components sd.
  • a microphone MIC Used for feedback again a microphone MIC as a receiver device, which is connected to a data processing device, the a decoding, correlation, evaluation and Initiating action.
  • These Data processing device C is expediently Component of the sound signal providing device or with this coupled to be issued subsequently or sound signals r to be supplied as required in advance modify.
  • Fig. 3 illustrates an audio playback system as part of a Video playback device for playing movies with Surround sound audio signals and a corresponding one Variety of speakers L1 - L5 as another Embodiment.
  • the illustrated audio signal providing device S represents a video signal in addition to the audio signal r, which z. B. from a DVD player (DVD: Digital Versatile Disc) or a video player in Art a video recorder VCR is provided.
  • VCR video recorder
  • For controlling includes the audio signal and image signal providing device S, VCR a control device C on which advantageously also the functions of Data providing device and optionally the Mixture M takes over.
  • this central features Unit of the audio playback system expediently a Display and input device A, via the one Plant operator P receives information and Can enter control statements.
  • One to the central Device S connected microphone MIC serves as Receiver device to the at the location of the microphone MIC record incoming sound waves sw + sd and one to supply the receiver-side data processing device, which in turn by the control device C according to preferred embodiment is formed.
  • the audio signal providing device and the Data supply device lead an audio signal s or a data signal d to the mixer M, which a correspondingly outputs mixed signal.
  • a signal s + d is then fed to the loudspeakers L1 - L3, L5.
  • the first Speaker L1 with a cable to the central arrangement with the mixing device M connected and gets over it directly the mixed-in to be converted into sound waves Signal s + d supplied.
  • Other speakers L2, L3, L5 get that in the mixing device M already mixed Signal r + rd with a sound signal r and a data signal rd supplied via a radio interface.
  • the radio interface is controlled by a radio interface transmitter TX and a Radio interface receiver RX2, RX3, RX5 formed.
  • the Radio interface receivers RX2, RX3, RX5 lead a Preprocessing the received mixed signal r + rd with Help a controller C through and then introduce suitable signal to the addressed speaker L2, L3 or L5 too. These convert accordingly received mixed Signal in sound waves sw + sd and enter them into the Environment. Be in the manner already described these sound waves are then picked up by the microphone MIC and in the manner of a feedback or feedback via the return channel to the receiver-side data processing device C for Decoding, evaluation and, if necessary, initiation of Corrective action forwarded.
  • Corrective action can be done in a variety of ways be required, as already described.
  • the case of an obstacle is also shown by way of example X, which is the radio link between the Radio interface transmitter TX and one of the radio interface receivers RX5 bothers. Due to the disorder of the mixed Radio signal sends the corresponding speaker L5 according to a changed or disturbed Sound wave pattern sw + sd off. This is from the microphone MIC recorded and the control device in the central Unit supplied.
  • audible warning messages via one or more of the speakers L1 - L5 or for example, a corresponding Warning message display or message display in It will be the screen of a connected TV TV allows the music system operator to know if it is is a recoverable disorder, and if so how this disturbance can be best remedied. So far possible, automation can also be provided Becoming an automatic introduction of corrections performs, such as Change channel or increase the Transmission power.
  • the microphone MIC as a receiver device is in the central arrangement device with the Sound providing device and the Data processing device arranged and at this connected shown. However, it is also possible variable positioning of the microphone MIC, with the Data processing device with a long Cable connection or optionally also with a Wireless interface, transmitting and receiving device connected is. Such a mobile microphone MIC can be used at a selected place of reception or when taking the Microphones through a music person P always listening to their music current receiving location for optimal playback enable. These are the audio signals r, the usually for the different speakers L1 - L5 are different, each also specifically assigned Associated with data signals rd. About the microphone MIC are the corresponding mixed sound waves sw + sd received and for evaluation to the data processing device C forwarded.
  • the data processing device C can based on runtime variations or Signal intensity variations as exemplified Parameters the signal intensity of the sound waves sd the determine individual speakers. Accordingly, then z. B. the audio signal r for a close to the location of the Microphone MIC speakers in terms of Intensity can be reduced while the audio signal r far away loudspeaker accordingly in terms of intensity is increased.
  • the described speakers L1 - L3, L5 respectively an already centrally in a central mixing device M from Tone signal and data signal mixed signal s + d, r + rd is supplied in the present and preferred Embodiment another speaker L4 or its radio interface receiver RX4 the sound signal r as independent signal forwarded.
  • the encoding or the Mixing with a data signal rd takes place in the Preprocessing device RX4 with the connected Radio interface receiver before the then mixed signal the speaker L4 for conversion into sound waves sw + sd is supplied.
  • the data signal or the data rd can parallel to the sound signal from central Device components to the speaker preprocessing device RX4 can be transmitted but also in this one from a store or over one suitable input device for mixing in one M mixing device M are provided, wherein the Mixing device M in the speaker preprocessing device RX4 is located.
  • the Sound source whose sound signal mixed with a Data signal is output from speakers.
  • the Sound waves from the speakers form the data return channel a microphone connected to a data processing device connected. This serves to control and / or Monitoring the sound signal playback.
  • FIG. 4 Further exemplary arrangements for implementing the Audio playback system and the procedure are based on Figures 4 - 8 illustrated.
  • a useful audio signal is output and in one Mixer M a psychoacoustic Data preprocessing and mixing of this useful audio data s with additional data d, dx is performed.
  • Over possibly further Devices G, TX, RX become the so mixed common audio data supplied to a speaker L1 and above this as mixed sound waves sw + sd, sw + sd + sdx output.
  • These mixed sound waves are from one Microphone NIC received and implemented accordingly Audio signal or supplied as an audio data stream as a detector.
  • the detector may preferably have a general Data processing device C, which e.g.
  • Additional data d, dx are various Method possible, in particular time, frequency and Code multiplexing used. This procedure is correct the direction of the control or transmission of control data d, dx as additional data with the direction of audio streaming match.
  • Data return channel provided, i. a controller upstream devices by downstream or subsequent Allows devices via a loop, which through the Sound path between speaker L1 and microphone MIC is closed.
  • this allows for control and control of Transmission path and the sound emission.
  • a data channel in particular as a return channel for External interfaces, for example a User interface on e.g. Radio or infrared base, wherein the user signal d at a downstream device fed and over the switching distance to one of the opposite the feed point M upstream device is transmitted.
  • a controller upstream devices by downstream devices with a Combination of soundtrack and combined Streaming channel is preferably a controller upstream devices by downstream devices with a Combination of soundtrack and combined Streaming channel.
  • Fig. 4 are Useful audio data as audio signal s from the data source Q provided and another subordinate institution N supplied.
  • the subordinate institution N becomes the Audio data s modified or re-modified to a Means mixer M forwarded.
  • the Mixer M are external additional data dx in the Audio signal or the audio data s mixed.
  • the Interference takes place according to psychoacoustic criteria.
  • the thus mixed audio signal s + dx becomes another one Mixer M supplied, in which more Additional data d be mixed.
  • Additional data d is, for example, internal Additional data for checking the transmission link to a another subordinate institution G or one downstream device G via the speaker L1 to Microphone MIC.
  • Spent from the speaker L1 thus mixed sound waves with a useful audio signal component sw, a first additional data sound wave component sw and a second additional data sound wave component sdx.
  • a detector such as a central Control device C of a music system or a computer fed.
  • the controller C From the controller C, the received Analyzed data and according to control instructions to the upstream of the mixer devices M, M Facilities Q, N issued. In particular, it is there possible, different facilities Q, N separately submit horrn.
  • FIG. 5 shows an exemplary embodiment in which a useful audio signal s from the signal source Q as Data provisioning device directly one Mixing device M are supplied.
  • the mixed signal s + d then becomes a transmitting device TX supplied, which is a conversion of the received mixed signal s + d into a radio signal r + rd performs and this radio signal over a radio link to a receiver device RX transmits.
  • TX a transmitting device
  • the Receiver device RX is the received radio signal r + rd ideally converted back into the audio signal s + d.
  • a fault has occurred on the radio link is from the Receiver device RX, however, a modified audio signal provided.
  • This audio signal will be another one Device G, for example an amplifier, supplied, which processes the audio signal and a loudspeaker L1 supplies. This generates sound waves, which in turn both the audio signal data as well as the additional data contain and be recorded by the microphone MIC.
  • the microphone MIC in turn represents corresponding mixed received Audio signal data for the data processing device C ready.
  • the serve Additional data preferably for monitoring the radio link, why the control device C or Data processing device C with the transmitter device STX connected to transfer these control statements.
  • control statements can be used to to change the transmission power on a high frequency channel.
  • the input additional data d come from a remote control, which a user the Input of control signals for the relative to Mixing device M upstream facilities or Devices Q, N of the audio playback system allows.
  • a remote control which a user the Input of control signals for the relative to Mixing device M upstream facilities or Devices Q, N of the audio playback system allows.
  • One User can thus use an input device, for example, an infrared remote control, wireless remote control or mechanical input elements on the Control mixer upstream devices Q, N control.
  • Fig. 7 illustrated in embodiment, in which the Mixer M a relative to other facilities or device downstream device, which is for input of control instructions d serves as additional data.
  • About the Loop from sound path and the streaming channel will be the upstream devices of the mixer device M controlled as a downstream device. It will For example, not the data provider as Data source Q but only one of these downstream Device N and / or other upstream devices N2 controlled.
  • Fig. 8 illustrates a further embodiment, in which a user of an audio playback system with the help a remote control F via a corresponding remote control counter interface FI can control the audio playback system.
  • a speaker is about an interface, in particular radio or infrared interface from other components of the Audio playback system discontinued.
  • the Receiver device RX of the speaker is thus a Receive audio signal r, whereby the receiver device RX the speaker B in the ideal case, a correct reconstructed audio signal s to a mixer device M leads.
  • the mixer M is data d as additional data supplied. This additional data comes from from a direct input device to the loudspeaker box B or the remote terminal FI.
  • the Mixer M mixes this additional data d into the Audio signal s and performs the mixed or common Signal to another device G to which, for example makes a gain to the amplified signal a To supply speaker L1.
  • the speaker L1 is in already described a mixed way Sound signal sw + sd off, which is received by the microphone MIC and in a mixed signal of the audio signal components s and the data shares d implemented.
  • This mixed signal is in turn supplied to the data processing device. ever if necessary, this can be individual or all of upstream devices Q, N, TX of the Audio playback system in front of the radio interface to the Activate loudspeaker B.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Stereophonic System (AREA)
  • Circuits Of Receivers In General (AREA)
EP04013029A 2003-07-14 2004-06-02 Système de reproduction audio avec canal de retour pour les données Withdrawn EP1499158A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10331757 2003-07-14
DE10331757A DE10331757B4 (de) 2003-07-14 2003-07-14 Audiowiedergabesystem mit einem Datenrückkanal

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Publication Number Publication Date
EP1499158A2 true EP1499158A2 (fr) 2005-01-19
EP1499158A3 EP1499158A3 (fr) 2007-04-11

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EP (1) EP1499158A3 (fr)
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DE10331757B4 (de) 2005-12-08

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