EP4367792A1 - Système de renfort sonore et son procédé de fonctionnement - Google Patents

Système de renfort sonore et son procédé de fonctionnement

Info

Publication number
EP4367792A1
EP4367792A1 EP22735466.9A EP22735466A EP4367792A1 EP 4367792 A1 EP4367792 A1 EP 4367792A1 EP 22735466 A EP22735466 A EP 22735466A EP 4367792 A1 EP4367792 A1 EP 4367792A1
Authority
EP
European Patent Office
Prior art keywords
amplifier
audio
output
audio amplifier
public address
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.)
Pending
Application number
EP22735466.9A
Other languages
German (de)
English (en)
Inventor
Josef Plager
Tobias Kieser
Gregor Sauer
Fredi PALM
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.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP4367792A1 publication Critical patent/EP4367792A1/fr
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
    • H03F1/52—Circuit arrangements for protecting such amplifiers
    • H03F1/526—Circuit arrangements for protecting such amplifiers protecting by using redundant amplifiers
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
    • H03F3/181—Low-frequency amplifiers, e.g. audio preamplifiers
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
    • H03F3/72—Gated amplifiers, i.e. amplifiers which are rendered operative or inoperative by means of a control signal
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F2200/00—Indexing scheme relating to amplifiers
    • H03F2200/03—Indexing scheme relating to amplifiers the amplifier being designed for audio applications
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F2203/00—Indexing scheme relating to amplifiers with only discharge tubes or only semiconductor devices as amplifying elements covered by H03F3/00
    • H03F2203/72—Indexing scheme relating to gated amplifiers, i.e. amplifiers which are rendered operative or inoperative by means of a control signal
    • H03F2203/7221—Indexing scheme relating to gated amplifiers, i.e. amplifiers which are rendered operative or inoperative by means of a control signal the gated amplifier being switched on or off by a switch at the output of the amplifier
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F2203/00—Indexing scheme relating to amplifiers with only discharge tubes or only semiconductor devices as amplifying elements covered by H03F3/00
    • H03F2203/72—Indexing scheme relating to gated amplifiers, i.e. amplifiers which are rendered operative or inoperative by means of a control signal
    • H03F2203/7224—Indexing scheme relating to gated amplifiers, i.e. amplifiers which are rendered operative or inoperative by means of a control signal the gated amplifier being switched on or off by clamping by a switch at the output of the amplifier

Definitions

  • the present invention relates to a public address system with at least one loudspeaker and a method for operating a public address system.
  • Public address systems are used, for example, to provide sound in rooms or outside areas; this can be with music but also for targeted announcements or similar.
  • a public address system has an amplifier and one or more loudspeakers.
  • a public address system is known from DE 102019208461 A1, for example.
  • the invention is concerned with public address systems and there in particular with amplifiers, via which one or more loudspeakers are controlled.
  • public address systems used as voice alarm systems (eg for important announcements during evacuations)
  • reliability is of particular importance.
  • In the event of an emergency it should be prevented under all circumstances that people cannot be optimally evacuated due to the failure of a public address system.
  • Various standards e.g. the VDE 0833 or EN54 standard series
  • local installation regulations and/or customer requirements make different specifications, for example, as to how and to what extent a certain fail-safety can or must be achieved.
  • One way to ensure a certain level of redundancy is, for example, a battery supply that keeps the voice alarm system running if the mains supply fails (as the power supply source).
  • So-called emergency amplifiers can also be used, which take over the function of a regular amplifier in the voice alarm system if it fails.
  • a failure of an amplifier can be detected, for example, by the absence of a pilot tone, whereupon the SAA switches to a spare amplifier. This usually requires complex, additional wiring.
  • a redundant design of the loudspeakers or the loudspeaker lines can also be considered, a so-called A/ B wiring.
  • a mixture of the sound reinforcement sections or sound reinforcement frequency ranges operated more intensively by an amplifier can be used to ensure that the so-called speech intelligibility index (STI) does not drop below a specified minimum value even if one or more loudspeakers or amplifiers fail.
  • the present invention also deals with a redundancy concept for audio amplifiers (these are power amplifiers for the audio range, ie for amplifying audio signals, in particular so-called pro-sound amplifiers with playback in the bass range ⁇ 100 Hz).
  • Such an output relay then leads to the amplifier output connection, to which loudspeakers or a loudspeaker line can be connected. So it connects the direct amplifying output of the audio amplifier with the connection for the speaker.
  • Such audio amplifiers with output relays are often used, for example, in so-called professional sound reinforcement systems or PA systems (public address sound reinforcement systems). The output relay is then used, for example, to prevent switch-on noises and to be able to separate the loudspeakers from the amplifier in the event of a fault.
  • such an output relay can be implemented as an opener or as a changeover switch.
  • an opener the output relay is closed during normal operation of the audio amplifier, i.e. when it is active and emitting a signal. The signal is then present at the amplifier output connection. If the audio amplifier is switched inactive, then the output relay is opened; the speaker lines are then separated. This means that redundant parallel switching of two amplifiers is possible in principle.
  • the output relay is switched over when the audio amplifier is switched inactive, so that the amplifier output connection on the output side is connected, for example, to a ground connection or ground output connection of the audio amplifier; the loudspeaker lines are then short-circuited and grounded, which has acoustic advantages.
  • a public address system with a loudspeaker and two such audio amplifiers, each with an output relay, the output relays being designed in particular as changeover switches, and their operation is now proposed.
  • Each of two connections of the loudspeaker is connected to one of the amplifier output connections of the changeover switch and the ground output connections of the changeover switch of the two audio amplifiers are connected to one another and/or to ground.
  • a toggle Also known as a toggle switch or changer.
  • the changeover switch has at least three connections, the changeover switch being designed in such a way that a center connection as the first connection is connected in the rest position to the second connection "normally closed” and in the other position is connected to the third connection "normally open".
  • the center connection of the changeover switch is designed as the amplifier output connection.
  • the second connection and/or in particular the third connection is designed as a ground output connection and is connected to ground.
  • Redundancy for audio amplifiers in a public address system can be created in a simple manner by means of the invention, with the system remaining operational even if an amplifier fails. No complex controls or interconnections are required. In particular, no additional external circuitry (relay sets) is required; Rather, a simple circuit / control is achieved in particular by integration into the amplifier.
  • each of the two audio amplifiers are operated in such a way that when it is active, the output relay is closed, so that a signal (output signal) is present at the amplifier output connection, and when it is inactive, the output relay is switched in such a way so that no signal is present at the amplifier output connection.
  • a corresponding voltage supply is required for the audio amplifier;
  • a corresponding input signal e.g. speech, music
  • the public address system is then operated in such a way that when at least one of the two audio amplifiers is activated (and then emits a signal that is present at the respective amplifier output connection), and when an audio amplifier that is activated becomes inactive, the other audio amplifier in each case automatically does so is operated in such a way that a signal with a higher output voltage than before is present at the respective amplifier output connection.
  • an actively switched audio amplifier becomes inactive, in particular re to understand that this audio amplifier no longer emits or can no longer emit a signal, for example due to a defect or error or a failure of its power supply, and thus (passively, so to speak) becomes inactive or is switched to inactive.
  • this can include at least two preferred options or variants.
  • One of them is that the other audio amplifier is initially switched to inactive (then this audio amplifier does not output any signal at all), and this is then automatically switched to active when the other becomes inactive.
  • the output relay is normally closed, so that a signal is present at the amplifier output connection.
  • the output relay is on a different contact (normally closed contact if it is designed as a changeover switch), so that there is no signal at its amplifier output connection. This applies, for example, despite a voltage supply being present at the audio amplifier and also an input signal that may be present that is to be amplified.
  • the output relay of the relevant audio amplifier can be specifically switched over for this purpose.
  • a logic logic circuit or other circuit
  • the output relay of the audio amplifier that has become inactive switches over, e.g. due to a defect or failure of the power supply (the output relay is e.g. de-energized and switches over automatically), the output relay of the other audio amplifier closes.
  • a suitable circuit can be used to ensure that the closed output relay of the initially active audio amplifier switches over the output relay of the other, inactive audio amplifier via another, simple relay.
  • both audio amplifiers are designed in the same way, so that each of the two can optionally be used as an active is used or alternatively as inactive and thus as a redundant audio amplifier. It is also expedient if a role of active and inactive audio amplifier is swapped in the public address system at predetermined and/or regular time intervals, ie if the two audio amplifiers are switched between active and active at predetermined and/or regular time intervals . This loads both audio amplifiers evenly. This can be done by a control, circuit or processing unit integrated into the public address system (or an audio amplifier arrangement comprising the two audio amplifiers), but a superordinate control or other processing unit is also conceivable.
  • both audio amplifiers are each switched to be active, in such a way that a signal with less than a full output voltage is present at the respective amplifier output connection. If one of the two actively switched audio amplifiers becomes inactive (e.g. due to a defect), the other audio amplifier is automatically operated in such a way that a signal with a higher output voltage than before, in particular the full output voltage, is present at the respective amplifier output connection.
  • one of the two audio amplifiers expediently outputs an inverted signal (i.e. with reversed polarity) compared to the other audio amplifier (otherwise, however, both audio amplifiers can be constructed in the same way). This ensures that the loudspeaker is always controlled in phase, regardless of whether one or both audio amplifiers are active. This also applies correspondingly to the first option.
  • each of the two audio amplifiers can each output 50% of a desired level; if one of the two audio amplifiers fails, the other then outputs 100% of the desired level (the desired level thus corresponds to the full output voltage).
  • a static signaling line can be provided, through which an audio amplifier recognizes that the other has failed (dead been) and thus the output power for the full output voltage he can increase.
  • the two audio amplifiers are preferably set up in such a way that one of the two audio amplifiers outputs an inverted signal in relation to the other audio amplifier at the respective amplifier output connection.
  • regular operation and emergency operation or emergency operation can be ensured with only one functional audio amplifier.
  • the two audio amplifiers each have a ground output connection. It is then preferably provided that the output relays each connect the respective amplifier output connection to the respective ground output connection, in particular automatically when the respective audio amplifier is inactive. This ensures that even if an audio amplifier fails, the amplifier output connection is grounded and poses no danger.
  • the acoustic advantages mentioned above are achieved, but the proposed redundancy is still possible, please include.
  • a ground connection can be implemented for the loudspeaker if only one audio amplifier is active.
  • ground output connections of both audio amplifiers are connected to one another (directly or via ground), it can be achieved that, in the case of an inactive audio amplifier and output relays designed as changeover switches, the loudspeaker connection connected to the inactive audio amplifier and the corresponding pole of the amplifier output are connected to ground lie.
  • the two audio amplifiers can preferably be connected to different voltage supply sources and, in particular, are also connected during operation. In this way, further redundancy can be achieved, in particular if a power supply source fails.
  • a particular advantage of the invention is that a redundant emergency concept for audio amplifiers can be achieved by skilful interconnection of the already existing and integrated output relays. Other components, such as an external backup switching unit, are not required.
  • backup amplifiers can be used, for example, in voice alarm systems in the event of an amplifier failure.
  • a so-called "looping in" of the auxiliary amplifier can be achieved by means of relays. While this can be implemented comparatively cheaply with the moderate performance of pure voice alarm systems (e.g.
  • prosound amplifiers such as those used in particular in public address sound systems or professional sound systems, make due to the high Output power high demands on the relays for an emergency concept.
  • the associated costs make an emergency concept for Prosound amplifiers unattractive.
  • the present invention is particularly advantageous - but not limited to this - for public address systems whose main function is to address the audience with non-safety-related audio signals (so-called public address public address systems or professional public address systems).
  • a typical example is the sound reinforcement system in a football stadium or other stadium, which, for example, gives the stadium announcer the opportunity to interact with the audience and enables high-quality music playback.
  • Systems of this type are often referred to as prosound systems, since they enable sound reinforcement in professional quality and, if necessary, with high and maximum volume. The failure of a Prosound system is generally undesirable. If a Prosound system is also to be used for evacuation purposes in the event of an emergency (e.g. fire, bomb threat, etc.), the redundancy requirements mentioned above are necessary.
  • prosound amplifiers usually have to deliver significantly higher output power (e.g. higher by a factor of ten) than pure evacuation amplifiers. This is due to the fact that Prosound systems have to deliver the most power in the bass range (approx. 30 to 100 Hz) due to the spectral power distribution of typical music signals. This frequency range is deliberately left out in (simpler) evacuation amplifiers because it does not provide any added value for speech intelligibility. Despite the particular advantages in professional public address systems, the invention can also be used in (simple) voice alarm systems.
  • loudspeaker Although the operation of a loudspeaker has been described above, other loudspeakers can also be operated with an amplifier arrangement, e.g. several parallel loudspeakers or entire loudspeaker lines. Thanks to the simple redundancy principle for Prosound amplifiers, the performance of the audio amplifiers can be better utilized when designing the system. For example, more loudspeakers than usual can be connected in parallel to an amplifier channel, since if one audio amplifier fails, there is no need to fear the failure of many loudspeakers, since the second audio amplifier takes over. When assigning loudspeakers to loudspeaker lines, there is no need to consider the effects of an audio amplifier failure, as there is always a redundant audio amplifier.
  • each of the two audio amplifiers can each have two or more channels, each channel having an output connection and the associated circuitry as explained (including output relays).
  • a ground output connection can be used jointly for several channels.
  • the redundancy concept can be implemented autonomously by the two audio amplifiers or the audio amplifier arrangement or public address system without additional superordinate control logic.
  • a higher-level control unit can also be provided, for example, which stage audio amplifier and can report. The failed audio amplifier can be replaced to restore the redundant emergency concept.
  • FIG. 1 schematically shows a public address system with an audio amplifier to explain the invention.
  • FIG. 2 schematically shows another public address system with another audio amplifier to explain the invention.
  • FIG. 3 schematically shows another public address system with two audio amplifiers to explain the invention.
  • FIG. 4 schematically shows a public address system according to the invention in a preferred embodiment.
  • FIG. 5 schematically shows a public address system according to the invention in a further preferred embodiment.
  • FIG. 1 shows a public address system 100 not according to the invention with an audio amplifier 110 to explain the invention, specifically in figure (a) with an active audio amplifier and in figure (b) with an inactive audio amplifier.
  • the audio amplifier 110 has an amplifier unit 112 and an output relay 114 which is connected to a gain output.
  • aisle connection 116 opens.
  • the audio amplifier 110 has a ground output terminal 118 .
  • the public address system 100 has, for example, a loudspeaker 130, one connection of which is connected to the amplifier output connection 116 via a line 132 and the other connection to the ground output connection 118 via a line 134.
  • the audio amplifier 110 is activated or activated.
  • an input signal UE that is to be amplified is present at an input connection (a second, typically present input connection is not shown here for the sake of clarity).
  • the audio amplifier 110 outputs a correspondingly amplified signal as an output signal UA at the amplifier output connection 116, so that the loudspeaker is operated.
  • a power supply is not shown here.
  • the output relay 114 is designed here as an opener, i.e. when the audio amplifier 110 is in the active state shown, the output relay 114 is closed.
  • the audio amplifier 110 is switched to inactive or inactive. This means that the output relay 114 is open; an input signal UE can still be present, but no output signal UA is output at the amplifier output connection 116 .
  • FIG. 2 shows a further public address system 200 not according to the invention with an audio amplifier 210 to explain the invention, specifically in figure (a) with an active audio amplifier and in figure (b) with an inactive audio amplifier.
  • the only difference to the public address system 100 according to Figure 1 is the audio amplifier 210, which, in contrast to the audio amplifier 110, has an output relay 214 which is designed as a changeover switch, i.e. the amplification output connection 116 (or the loudspeaker line connected to it) either with the output signal or connected to ground.
  • the amplifier unit 112 can be identical, for example.
  • the other components correspond to those according to Figure 1.
  • the audio amplifier 210 is activated or activated.
  • the situation does not differ from that in Figure 1, Figure (a) there.
  • the audio amplifier 210 is switched to inactive or inactive. This means that the output relay 214 is switched and thus closes the break contact; in this case, the amplifier output connection 116 is connected to the mass output connection 118, so that both lines 132, 134 of the loudspeaker 130 are connected to ground.
  • an input signal UE can continue to be present, but no output signal UA is output at the amplifier output connection 116 .
  • FIG. 3 shows another public address system 300 that is not according to the invention.
  • the public address system 300 basically corresponds to that from FIG.
  • a supply voltage source V+ is shown for the audio amplifier 110 .
  • a separate supply voltage source V'+ is provided for the audio amplifier 110'.
  • the loudspeaker 130 is also connected to the audio amplifier 110', so that the two audio amplifiers 110, 110' are connected in parallel.
  • the audio amplifier 110 is switched to be active, while the audio amplifier 110' is inactive. This can be seen in the corresponding positions or switching states of the output relays 114 designed as break contacts.
  • the two audio amplifiers 110, 110' are now part of an audio amplifier arrangement 301, which also has a circuit 305 (shown only schematically) by way of example. By means of this circuit 305 it is possible, when the audio amplifier 110 is activated, to switch the audio amplifier 110' inactive, e.g. by opening its output relay 114.
  • the signal UA emitted by the active audio amplifier 110 is present at the loudspeaker 130, and regular operation can take place. If, for example, a defect occurs in the audio amplifier 110 or its amplifier unit 112, or its voltage supply source V+ breaks down, the audio amplifier 110 becomes inactive, the output relay 114 (of the audio amplifier 110) opens (because, for example, there is no longer any voltage), so that the audio amplifier 110 no longer emits a signal. This can be detected by means of the circuit 305 and the output relay 114 of the audio amplifier 110' can be closed automatically. The audio amplifier 110′ now outputs the signal UA, which it generates from the applied input signal UE in the same way as the audio amplifier 110 did before.
  • the circuit 305 is, for example, a static message line with which the active audio amplifier switches the other audio amplifier to standby with a "high signal". In the event of an error, the signaling line is pulled to "Low” (or in the event of a complete failure, this occurs passively due to failure of the internal supply voltage).
  • the circuit 305 can also take place via data communication, and this can also be a higher-level monitoring unit.
  • a public address system 400 is shown schematically in FIG. 4 in a preferred embodiment.
  • the public address system 400 is similar to that from FIG. 3, but instead of the audio amplifier 110, an audio amplifier 410 with an amplifier unit 412 is provided, but the output relay 214 is in the form of a changeover switch.
  • another audio amplifier 410' is provided, which is basically the same as the audio amplifier 410 in terms of its function and structure.
  • a supply voltage source V+ is shown for the audio amplifier 410 .
  • a separate supply voltage source V'+ is provided for the audio amplifier 410'. Both audio amplifiers are part of an audio amplifier arrangement 401.
  • the speaker 130 is here with both connections with the lines 132,
  • another loudspeaker 130' is indicated, which is connected parallel to the loudspeaker 130 to the two audio amplifiers 410, 410', so that this can also be controlled via it. It goes without saying that additional loudspeakers and in particular an entire loudspeaker line can be connected in this way.
  • the audio amplifier 410 is switched to be active, whereas the audio amplifier 410' is inactive. This can be seen from the corresponding positions or switching states of the output relays 214, each designed as a changeover switch.
  • the two audio amplifiers 410, 410' are now part of an audio amplifier arrangement 401, which also has a circuit 405, for example, which can basically be similar to the circuit 305. By means of this circuit 405 it is possible, when the audio amplifier 410 is activated, to switch the audio amplifier 410' inactive, e.g. by switching its output relay 214.
  • the audio amplifier 410′ outputs an inverted signal.
  • the input signal UE can, for example, be amplified in the audio amplifier (eg DSP) in phase or in opposite phase (analog or digital through appropriate signal processing), which expresses the polarity between the output signal and the input signal.
  • An anti-phase amplification is indicated here with a minus symbol (in the case of the audio amplifier 410'), an in-phase amplification with a plus symbol (in the case of the audio amplifier 410).
  • This execution form then simultaneously also allows a preferred parallel operation, as is described with reference to FIG.
  • a public address system 500 is shown schematically in FIG. 5 in a further preferred embodiment.
  • the public address system 500 is similar to that from FIG. 4, but instead of the audio amplifiers 410, 410', audio amplifiers 510, 510' with amplifier units 512 or 512' are provided here, but both output relays 214 are also designed as changeover switches here. Both audio amplifiers are part of an audio amplifier arrangement 501.
  • Both audio amplifiers 510, 510' can be basically the same in terms of their function and structure, but one of them emits an inverted signal, as was also described in FIG.
  • the additional loudspeaker 130' is not shown here, but can also be provided.
  • both audio amplifiers 510, 510' are switched to be active, in such a way that a signal U'A is output which, for example, only has half the value of an actually desired level (voltage value). Due to the series connection and the inverted operation, the full level is still present at the loudspeaker 130.
  • the two audio amplifiers 510, 510' are now part of an audio amplifier arrangement 501, which also has a circuit 505 by way of example. If, for example, a defect occurs in the audio amplifier 510 or its amplifier unit 512, or its voltage supply source V+ breaks down, the audio amplifier 510 becomes inactive, the output relay 214 (of the audio amplifier 512) switches (because, for example, there is no longer any voltage), so that the audio amplifier 510 no longer emits a signal. By means of the circuit 505 this can be detected and the audio amplifier 510' can be switched automatically in such a way that it outputs the signal at full level; the loudspeaker 130 is therefore still at the full level. Overall, within the scope of the invention, a particularly simple and cost-effective possibility is thus proposed for designing a public address system redundantly, at least with regard to the audio amplifier.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Multimedia (AREA)
  • Amplifiers (AREA)

Abstract

L'invention concerne un système de renfort sonore (400) comprenant un haut-parleur (130) et deux amplificateurs audio (410, 410'), chaque amplificateur audio (410, 410') étant équipé d'un relais de sortie (214) qui s'étend jusqu'à une borne de sortie d'amplificateur (116) de l'amplificateur audio associé, ainsi qu'une borne de sortie de masse (118) ; chacune des deux bornes du haut-parleur (130) est connectée à l'une des bornes de sortie d'amplificateur ; les bornes de sortie de masse (118) des deux amplificateurs audio (410, 410') sont reliées l'une à l'autre et/ou à la masse. L'invention concerne également un procédé de fonctionnement d'un système de renfort sonore (400) dudit type.
EP22735466.9A 2021-07-06 2022-06-29 Système de renfort sonore et son procédé de fonctionnement Pending EP4367792A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102021207056.6A DE102021207056A1 (de) 2021-07-06 2021-07-06 Beschallungsanlage und Verfahren zu deren Betrieb
PCT/EP2022/067905 WO2023280655A1 (fr) 2021-07-06 2022-06-29 Système de renfort sonore et son procédé de fonctionnement

Publications (1)

Publication Number Publication Date
EP4367792A1 true EP4367792A1 (fr) 2024-05-15

Family

ID=82321289

Family Applications (1)

Application Number Title Priority Date Filing Date
EP22735466.9A Pending EP4367792A1 (fr) 2021-07-06 2022-06-29 Système de renfort sonore et son procédé de fonctionnement

Country Status (5)

Country Link
US (1) US20240313712A1 (fr)
EP (1) EP4367792A1 (fr)
CN (1) CN117616689A (fr)
DE (1) DE102021207056A1 (fr)
WO (1) WO2023280655A1 (fr)

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH09214265A (ja) * 1996-02-02 1997-08-15 Nippon Columbia Co Ltd 電力増幅回路
CA3210579A1 (fr) * 2018-02-23 2019-08-29 Qsc, Llc Ensembles amplificateurs audio, processus et procedes
DE102019208461A1 (de) 2019-06-11 2020-12-17 Robert Bosch Gmbh Audiogeräteanordnung, Konfigurationseinrichtung, Verfahren und Computerprogramm

Also Published As

Publication number Publication date
WO2023280655A1 (fr) 2023-01-12
CN117616689A (zh) 2024-02-27
US20240313712A1 (en) 2024-09-19
DE102021207056A1 (de) 2023-01-12

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