EP4374581A2 - Dispositif et procédé destinés à alimenter un espace en son - Google Patents

Dispositif et procédé destinés à alimenter un espace en son

Info

Publication number
EP4374581A2
EP4374581A2 EP22751661.4A EP22751661A EP4374581A2 EP 4374581 A2 EP4374581 A2 EP 4374581A2 EP 22751661 A EP22751661 A EP 22751661A EP 4374581 A2 EP4374581 A2 EP 4374581A2
Authority
EP
European Patent Office
Prior art keywords
signal
loudspeaker
mixed
channel
designed
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
EP22751661.4A
Other languages
German (de)
English (en)
Inventor
Klaus Kaetel
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.)
Kaetel Systems GmbH
Original Assignee
Kaetel Systems 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 Kaetel Systems GmbH filed Critical Kaetel Systems GmbH
Publication of EP4374581A2 publication Critical patent/EP4374581A2/fr
Pending legal-status Critical Current

Links

Classifications

    • 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
    • H04S7/305—Electronic adaptation of stereophonic audio signals to reverberation of the listening space
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS
    • H04R5/00—Stereophonic arrangements
    • H04R5/04—Circuit arrangements, e.g. for selective connection of amplifier inputs/outputs to loudspeakers, for loudspeaker detection, or for adaptation of settings to personal preferences or hearing impairments
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS
    • H04R5/00—Stereophonic arrangements
    • H04R5/02—Spatial or constructional arrangements of loudspeakers
    • H04R5/023—Spatial or constructional arrangements of loudspeakers in a chair, pillow
    • 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
    • H04S7/302—Electronic adaptation of stereophonic sound system to listener position or orientation
    • H04S7/303—Tracking of listener position or orientation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS
    • H04R2205/00—Details of stereophonic arrangements covered by H04R5/00 but not provided for in any of its subgroups
    • H04R2205/024—Positioning of loudspeaker enclosures for spatial sound reproduction
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS
    • H04R2420/00—Details of connection covered by H04R, not provided for in its groups
    • H04R2420/01—Input selection or mixing for amplifiers or loudspeakers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS
    • H04R2499/00—Aspects covered by H04R or H04S not otherwise provided for in their subgroups
    • H04R2499/10—General applications
    • H04R2499/13—Acoustic transducers and sound field adaptation in vehicles
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS
    • H04R27/00—Public address systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04S—STEREOPHONIC SYSTEMS 
    • H04S2400/00—Details of stereophonic systems covered by H04S but not provided for in its groups
    • H04S2400/01—Multi-channel, i.e. more than two input channels, sound reproduction with two speakers wherein the multi-channel information is substantially preserved
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04S—STEREOPHONIC SYSTEMS 
    • H04S2400/00—Details of stereophonic systems covered by H04S but not provided for in its groups
    • H04S2400/15—Aspects of sound capture and related signal processing for recording or reproduction
    • 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

Definitions

  • the present invention relates to electroacoustics and in particular to concepts for generating and reproducing audio signals in a room, such as. B. a vehicle or a stationary room, such as a hall, a waiting area, etc.
  • acoustic scenes are recorded using a set of microphones. Each microphone outputs a microphone signal.
  • a microphone signal For example, for an orchestral audio scene, 25 microphones may be used.
  • a sound engineer performs a mixing of the 25 microphone output signals into, for example, a standard format such as a stereo format, a 5.1, a 7.1, a 7.2, or other appropriate format.
  • a stereo format for example, two stereo channels are created by the sound engineer or an automatic mixing process.
  • a 5.1 format mixing results in five channels and one subwoofer channel.
  • a mix is made into seven channels and two subwoofer channels in a 7.2 format, for example.
  • a mixed result is fed to electrodynamic loudspeakers.
  • two speakers exist, with the first speaker receiving the first stereo channel and the second speaker receiving the second stereo channel.
  • a 7.2 playback format for example, there are seven loudspeakers in predetermined positions and two subwoofers that can be placed relatively arbitrarily. The seven channels are routed to their respective speakers, and the two subwoofer channels are routed to their respective subwoofers.
  • European patent EP 2692154 B1 describes a set for capturing and playing back an audio scene in which not only the translation is recorded and played back, but also the rotation and also the vibration. Therefore, a sound scene reproduced not only by a single detection signal or a single mixed signal, but by two detection signals or two mixed signals which are simultaneously recorded on the one hand and reproduced simultaneously on the other hand. This ensures that different emission characteristics are recorded from the audio scene compared to a standard recording and are reproduced in a playback environment.
  • a set of microphones is placed between the acoustic scene and an (imaginary) auditorium to capture the “conventional” or translational signal, characterized by high directivity or high goodness.
  • a second set of microphones is placed above or to the side of the acoustic scene to record a low-Q or low-directivity signal intended to represent the rotation of the sound waves as opposed to translation.
  • corresponding loudspeakers are placed in the typical standard positions, each having an omnidirectional array to reproduce the rotational signal and a directional array to reproduce the "conventional" translational sound signal.
  • European patent EP 2692144 B1 discloses a loudspeaker for reproducing, on the one hand, the translatory audio signal and, on the other hand, the rotary audio signal.
  • the loudspeaker thus has an omnidirectionally emitting arrangement on the one hand and a directionally emitting arrangement on the other hand.
  • European patent EP 2692151 B1 discloses an electret microphone which can be used to record the omnidirectional or the directional signal.
  • European patent EP 3061262 B1 discloses an earphone and a method for manufacturing an earphone that generates both a translational sound field and a rotary sound field.
  • the European patent EP 3061266 B1 discloses a headphone and a method for producing a headphone which is designed to generate the “conventional” translational sound signal using a first transducer and the rotary sound signal using a second transducer arranged perpendicularly to the first transducer to generate a sound field.
  • the recording and playback of the rotational sound field in addition to the translational sound field leads to a significantly improved and thus high-quality audio signal perception, which almost conveys the impression of a live concert, although the audio signal is reproduced through loudspeakers or headphones or earphones.
  • a disadvantage of the concept described is that the recording of the additional signal, which reproduces the rotation of the sound field, represents an additional expense.
  • pieces of music be it classical pieces or pop pieces, in which only the conventional translational sound field has been recorded. These pieces are typically still highly compressed in their data rate, such as in accordance with the MP3 standard or the MP4 standard, which contributes to an additional deterioration in quality which, however, is normally only audible to experienced listeners.
  • the object of the present invention is to create an improved concept for sound supply in a room.
  • the control signal generator includes, in particular, a mixed signal generator stage and a mixer stage.
  • the mixed signal generator stage generates a first and a second mixed signal, which have a phase difference with respect to one another.
  • the mixer stage mixes the two mixed signals with the first or second channel signal.
  • the device also includes an interface for transmitting the first control signal to the first loudspeaker and for transmitting the second control signal to the second loudspeaker.
  • the interface can be wired or wireless and, depending on the implementation, may or may not already include a power amplifier.
  • the interface can also carry out further measures for the control signals, such as equalizer processing of the signals or source coding of the signals or source coding and transmitter processing of the signals in order to e.g. B. wirelessly by means of a wireless protocol, such as Bluetooth or DECT, to an input interface of a speaker module, which then typically also has a power amplifier.
  • a wireless protocol such as Bluetooth or DECT
  • the present invention is based on the finding that already by generating a first and a second mixed signal, both of which are derived from the first channel signal, the second channel signal or from both channel signals, a differential wave field around the two loudspeakers and therefore around a person which is sonicated by the loudspeakers, can be generated which, in addition to the translational sound emitted by the two loudspeakers, also represents the rotary sound, which leads to a very considerable improvement in the quality of the subjective audio perception.
  • the differential wave field is generated in that the control signals for the loudspeakers are correspondingly subjected to signals that have a phase difference from one another, this phase difference preferably being 180°, but in one area can be between 160° and 200°, while an almost identical effect is obtained as when the signals have the preferably best phase shift of 180°.
  • the effect of the differential wave field is the better, the closer the first and second loudspeakers are arranged to one another.
  • the loudspeakers should preferably be at least 10 cm apart and at most 1 m apart, with distances in the range of 20 cm (e.g. 15 to 30 cm) being preferred, as is particularly the case in headrests of vehicle seats or other seats such as they can be found in waiting areas.
  • the relatively close spatial arrangement of the two loudspeakers means that no separate sound generators are required to generate the differential wave field. Instead, it is sufficient that the two loudspeakers receive the special control signals according to the invention.
  • Only one channel signal ie either the left channel signal or the right channel signal, can be used to generate the control signals.
  • a sum of the two channel signals i.e. a mono signal
  • the calculation of the mixed signals is based on taking a difference between the two channel signals, which tends to dominate the mixed signals.
  • this difference can be used directly, or can be combined with a sum signal, or can be combined with the left channel signal or the right channel signal.
  • a distance measurement is also provided in order to determine the distance between the head of the person to be exposed to sound and between the two ears of the person to be exposed to sound.
  • These distance sensors are preferably designed as ultrasonic sensors.
  • Such a distance sensor is next to each speaker z. B. provided in a headrest of a passenger seat or a waiting seat. This can be used to determine the distance of the head end near this speaker.
  • the distance measurement is used to perform volume equalization, bass equalization or delay equalization. If the distance between the head and the speaker increases, the level on the side where the increase in distance was measured increases, or the bass for this speaker increases.
  • a delay adjustment can also be made for the speaker so that the delay for this speaker decreases compared to the other speaker.
  • the delay adjustment for this loudspeaker compared to the other loudspeaker is made such that the delay for the loudspeaker that has an increasing distance from the user's head increases.
  • the speakers are according to the invention in a room such. B. an interior in a vehicle such. B. a land vehicle (car, train, sledge, motor vehicle, ...), an aircraft ("passenger” aircraft, helicopter, zeppelin, etc.), a watercraft (ship, ferry, yacht, sailing ship, etc.) , or a spacecraft and preferably installed in a headrest for a driver of the vehicle or for a passenger or a passenger of the vehicle.
  • the room can also be a waiting room, e.g. B.
  • the headrest or the loudspeakers have at least one left and one right loudspeaker, which are located to the left and right of each ear of the driver Driver or the passenger or the person in general is arranged.
  • the other sound system in the vehicle or in the room also continues and leads z.
  • the additional sound reinforcement from the loudspeakers takes place parallel to the conventional sound reinforcement.
  • Speakers are preferably provided at a number of places in the vehicle, with speakers being deactivated for a place that is not occupied, e.g. B. can be achieved by a sensor or alternative means.
  • the loudspeakers generate differential sound wave fields. These can be generated via a vibrating surface (planar transducer) or via two adjacent piston transducers vibrating in push-pull (loudspeakers) or other transducers described. Mono and/or differential signals (L-R or R-L) can be used as the source signal for generating the differential sound wave field.
  • a synthetic generation of the rotation signal is possible if an audio piece with more than one channel, i.e. already with two stereo channels, for example, or even more channels, exists.
  • at least one approximation to the difference signal or rotation signal is obtained according to the invention, which can then be used to control the corresponding loudspeakers together with the respective channel signal.
  • the difference signal is used to calculate two mixed signals which have a phase difference with respect to one another.
  • the control signal generator is equipped with a down-converter for the first channel signal, ie. B. for the left channel, and another down mixer for the second channel signal, ie for the right channel upstream.
  • the signal is an original microphone signal, such as an ambisonics signal with several components
  • each down-converter is designed to calculate a left or right channel from the ambisonics signal, which is then used by the control signal generator to Calculate control signals.
  • the loudspeakers are arranged separately from the drive signal generator.
  • the loudspeakers have signal inputs which can be wired or wireless, with a signal for a sound generator in the loudspeaker being generated at each signal input.
  • the control signal generator which supplies the control signals for the sound generators, is arranged remotely from the actual loudspeaker and is connected to the loudspeakers via a communication link, such as a wired connection or a wireless connection.
  • control signal generator is integrated in the loudspeakers or in a loudspeaker or in the vehicle.
  • the common mode signal and, depending on the implementation and embodiment, the push-pull signal are derived separately or from the common mode signal in the loudspeaker with an integrated signal processor.
  • One aspect of the present invention thus relates to the loudspeaker without a signal processor.
  • Another aspect of the present invention thus also relates to the signal processor without a loudspeaker and a further aspect of the present invention relates to the loudspeaker with an integrated signal processor.
  • a multi-channel signal when a multi-channel signal is present, for example as a stereo signal or as a signal with three or more channels, the control signals are derived from this multi-channel representation.
  • a stereo signal for example, a side signal is calculated that represents the difference between the left and right channels, with this side signal then being correspondingly attenuated or amplified, if necessary, and mixed with a non-high-pass filtered or high-pass-filtered common-mode signal, depending on the implementation. If the output signal has multiple channels, the mixed signals can be generated from differences between any two channels of the multi-channel representation.
  • a difference between left and right rear (right surround) could be created, or alternatively a difference between the middle channel (center channel) and one of the other four channels of a five-channel representation.
  • a difference between left and right can also be determined, as with a stereo display, to generate the side signal.
  • specific channels of the five-channel representation can be added, ie a two-channel downmix can be determined.
  • An exemplary implementation for generating a two-channel downmix signal is to add left rear (left surround), left and center weighting factors, if necessary, to create a left downmix signal. create channel.
  • the channel on the right rear (right surround) is added to the right channel and the middle channel again, with weighting factors if necessary.
  • the mixed signals can then be determined based on a difference between the left downmix channel and the right downmix channel.
  • Fig. 1 shows a preferred embodiment of a device for a sound supply in a room
  • FIG. 3 shows an arrangement of the two loudspeakers using the example of a vehicle interior with a driver
  • Fig. 4 shows an embodiment with a sum signal as a basis for the Mischsig signals
  • Figure 5 shows an implementation of the invention with a channel signal as the basis for the mixed signals
  • the mixed signal generating stage having a further input stage and a further branching stage
  • FIG. 8 shows a further embodiment with a mono signal and a differential signal as the basis for the two mixed signals
  • Fig. 9 shows an alternative embodiment relating to Fig. 8, in which the other channel signal is phase-inverted; and 10 shows a preferred embodiment of the present invention in a schematic representation with a distance measurement between the head and the loudspeakers.
  • figs 1 to 10 show aspects of sound generation in a vehicle according to the invention.
  • the sound generators are according to the invention in a vehicle such.
  • B. a land vehicle (car, train, sleigh, motor vehicle, ...), an aircraft ("passenger” plane, helicopter, zeppelin, etc.), a watercraft (ship, ferry, yacht, sailing ship, etc.) , or a spacecraft and preferably in a headrest for a driver of the vehicle or for a passenger or a passenger of the vehicle.
  • the headrest or the sound generators have at least one left and one right loudspeaker, which is arranged to the left or right of a respective ear of the driver or the passenger.
  • the rest of the sound system in the vehicle also continues and leads z.
  • the additional sound reinforcement from the loudspeakers takes place parallel to the conventional sound reinforcement.
  • Speakers are preferably provided at a number of places in the vehicle, with speakers being deactivated for a place that is not occupied, e.g. B. can be achieved by a sensor or alternative means.
  • the loudspeakers generate differential sound wave fields. These can be generated via a vibrating surface (planar transducer) or via two adjacent piston transducers vibrating in push-pull (loudspeakers) or other transducers described. Mono and/or differential signals (L-R or R-L) can be used as the source signal for generating the differential sound wave field.
  • Fig. 1 shows a device for sound supply in a room with a first loudspeaker 21 and a second loudspeaker 22, which are shown in Fig. 2 and other figures.
  • the device includes a control signal generator 10 for generating a first drive signal 15a for the first loudspeaker 21 and a second drive signal 15b for the second loudspeaker 22, the drive signal generator 10 having a mixed signal generator stage 12 and a mixer stage 14 connected downstream.
  • the mixed signal generator stage 12 generates a first mixed signal 13a for the first drive signal and a second mixed signal 13b for the second drive signal.
  • the mixed signal generator stage 12 receives at an input thereof either the first channel signal 6 or the second channel signal 8 or both channel signals, depending on the implementation.
  • the mixed signal generator stage 12 is designed to generate the mixed signals in such a way that the first mixed signal 13a and the second mixed signal 13b have a phase difference with respect to one another.
  • This phase difference of the mixed signals is preferably between 160° and 200° and most preferably 180°, in order to obtain the highest possible psychoacoustic and qualitatively positive hearing impression through the sound field generated by the two loudspeakers in the room to be supplied.
  • the mixer stage 14 is designed to mix the first channel signal 6 with the first mixed signal 13a in order to obtain the first drive signal 15a. Furthermore, the mixer stage 14 is designed to mix the second channel signal 8 and the second mixed signal 13b in order to obtain the second drive signal 15b.
  • An interface 16 is connected downstream of the control signal generator device 10 in order to transmit the first control signal 15a and the second control signal 15b to the first loudspeaker 21 and to the second loudspeaker 22, respectively.
  • the interface can be a wired interface such that the first loudspeaker 21 and the second loudspeaker 22 are arranged at the output of the interface 16, optionally through amplifiers 46, 48, which are shown in FIG.
  • the interface may be a wireless interface, as illustrated in FIG. 7, for example.
  • the interface 16 comprises a transmitter stage (TX) 16a and a downstream antenna 16b.
  • TX transmitter stage
  • RX receiver stage
  • the two control signals received are then fed to a first receiving amplifier 62 and a second receiving amplifier 64, respectively, in order to supply the loudspeakers 21, 22 with the thereby amplified driving signals.
  • the space is an interior of a vehicle, and the apparatus further includes the first speaker and the second speaker 21, 22, these two Speakers are arranged in the vehicle.
  • the space may be the interior of a government agency waiting area, an airport, ferry terminal or any other "railway station" or the waiting area of a doctor's office, where seats are arranged that are fitted with headrests or something similar. in order to achieve sound supply for a user of the seat.
  • the speakers are arranged in a headrest 24 of the vehicle or a seat in the vehicle or the stationary room.
  • the seat can be the driver's seat.
  • the seat may be the passenger seat or any other seat for a passenger in the vehicle which, as is normally the case for all seats, is provided with a headrest 24.
  • the two loudspeakers are placed near the user's head by another appropriate device, or the loudspeakers are designed to to generate a sound field around the user's head, this sound field having the direct sound component due to the channel signals and also the push-pull component or rotary component or a differential wave field due to the mixing of the mixed signals with the channel signals.
  • a wave field is generated around the user by the loudspeakers, which are arranged near the two ears of the user or the user, which has the common-mode component and due to the Mixed signals also have a push-pull component or differential mode component.
  • the mixed signal generator stage 12 comprises an input stage 12a and a branching stage 12b, the input stage being designed to generate a common signal, as can be seen from FIG. 2 at the output of the input stage 12a, the branching stage is.bil det to from this common signal, the first mixed signal 13a and the second To generate mixed signal 13b, which have each other the phase difference, which is preferably 180 °.
  • the input stage 12a comprises a phase inverter 30 which generates a phase inversion (phase reverse).
  • an adder shown at 32 in FIG. The output signal of the adder 32 represents the common signal.
  • This output signal is the signal RL in the exemplary embodiment shown in FIG however, it is pointed out that the two channel signals do not necessarily have to be a left channel and a right channel, but that a left rear channel (“left surround”) or a right rear channel (“right surround”) can also be used here.
  • the first channel signal and the right channel signal can also be a left or right downmix of any type of multi-channel format with five, seven or more channels.
  • the left or right channel signal can also be a front/rear downmix signal from a 5.1, 7.1 or any other multi-channel signal format.
  • the branching stage 12b downstream of the input stage 12a comprises a branching point 35 and a first downstream 90° phase shifter 34 and a second downstream -90° phase shifter 36. Both phase shifters 34, 36 are designed to generate a signal pair at their output , which has the phase difference. Furthermore, the branching stage 12b in FIG. 2 is designed to adjustably amplify the signals at the outputs of the two phase shifters 34, 36 or to adjust the level by means of appropriate level adjusters 38, 40 in order to mix the signals 13a, 13b at the output of the level adjusters 38 to get 40.
  • the mixer stage 14 comprises a first adder 42 for the first channel signal 6 and a second adder 44 for the second channel signal 8.
  • the mixer stage can also be designed not to carry out pure addition, but rather a weighted one Addition, or any other operation to combine in the time domain, in the frequency domain or in any other way the first channel signal with the first mixed signal or the second channel signal with the second mixed signal, i. H. to mix.
  • the branching stage which is also the output of the drive signal generator 12 are the two drive signals 15a, 15b, which point within the interface 16, which in the embodiment shown in Fig. 2 the two amplifiers 46, 48 has, are amplified to then be supplied to the first speaker 21 and the second speaker 22, which are arranged in the embodiment shown in Fig. 2 in the headrest of a vehicle or a seat in a stationary room.
  • the relatively close emission of the push-pull or difference wave lenfeld which is represented by the two mixed signals 13a, 13b
  • a high-quality hearing impression for the listener which is shown schematically at 26, is achieved, which also has a superior Speech intelligibility due to the greater fidelity of the generated sound field.
  • FIG. 3 shows a front view of the listener 26 seated in the driver's seat of a vehicle controlled by a controller 25.
  • FIG. It is shown that the loudspeakers are placed behind the ears or next to the listener's two ears, and the emission direction of the loudspeakers is directed towards the listener's gaze when the listener assumes his or her normal position in the seat.
  • the branching stage 12a does not include any phase inversion.
  • the common signal at the branching point 35 of the branching stage is a mono signal, ie the sum of the left and the right signal.
  • This common signal is fed back to the two phase shifters 34, 36 to produce the mixed signals which are present at the output of the branching stage 12b.
  • the level adjusters 38, 40 are in functional unit with the mixer, ie they are part of the mixer, and the addition between the channel signal and the corresponding mixed signal takes place after the mixed signal has been weighted.
  • the channel signal can also be weighted, although this is not shown in FIG.
  • the channel signal on the one hand and the mixed signal on the other hand can both be weighted, with this weighting being stationary, i.e. fixed, or dynamic, i.e. within an audio piece, being variable.
  • the branching stage 12b is designed as in FIG.
  • the input stage 12a is designed such that the input signal to the mixed-signal generator stage is only the first channel signal 6 .
  • the input stage 12a is designed in such a way that only the second channel signal 8, ie, in the exemplary embodiment shown in FIG. 6, is the right-hand channel signal.
  • the implementation of the input stage is as in FIG. 5.
  • a further input stage is provided, which is designed as in FIG. 6, and a further branching stage is provided, which has the branching point 35'. , the first phase shifter 34' and the second phase shifter 36'.
  • the further branching stage can also include level adjusters 38', 40'.
  • the mixer stage 14 is designed to mix the channel signal not only with a first mixed signal from the first branching stage, but also with a further first mixed signal from the further branching stage, i.e. the branching stage which has the branching point 35' as an input node.
  • the further branching stage and the branching stage can be constructed identically, as is the case in the exemplary embodiment shown in FIG. However, they can be designed differently, ie with different phase shifter values or different level setting values, depending on the implementation.
  • the interface design which in the exemplary embodiment shown in FIG. 7 includes a wireless implementation, can also be implemented in the exemplary embodiments according to FIGS. 2, 4, 5, 6.
  • the interface in FIG. 7 can also be designed in the same way as in FIG. 2, for example, i.e. with a wired supply of the loudspeakers 21, 22.
  • FIG. 8 shows a further embodiment in which the input stage uses both the difference signal at the output of the adder 32 and the sum signal at the output of an adder 32'.
  • these two signals can also be set at the level shown by the two level adjusters 33a, 33b, and these two signals at the output of the level adjusters 33a, 33b are combined with one another in this exemplary embodiment of FIG. 8 by an adder 33c added to obtain the common signal, which is then processed by the branching stage 12b, as shown for example with reference to other figures, i.e. with the first phase shifter 34, the second phase shifter 36 and level adjusters 38, 40, which are used in the case of the in Fig. 8 embodiment shown are controlled together with the same setting value.
  • it can also be controlled with different control values th, as is the case in the previous figures, or in the previous figures, the respective level adjuster 38 and the other level adjuster 40 can also be controlled with the same setting value.
  • the common signal from which the two mixed signals are derived is determined from the mono signal, ie the sum of left and right, and a first difference signal, ie the signal (L-R).
  • the common signal at the output of the combiner 33c in contrast to FIG it was also the case in FIG.
  • the branching stage includes a +90° phase shifter 34 and a -90° phase shifter 36, it should be understood that this is merely a preferred embodiment which produces particularly high quality results be generated.
  • the branching stage can also be configured in such a way that a phase shifter, e.g. B. only 70 ° generated and the other phase shifter also only -70 °, or -110 ° generated to turn the output side to get the preferred phase difference value of 180 °.
  • one branch of the branching stage 12b can also work without a phase shift, while the other branch works with a phase shift of 180°, which is particularly easy to implement if a plug-socket combination is set “upside down”, so to speak.
  • phase shifter 30 of FIG. 9 or FIG. 2 or in the phase shifter 31 of FIG. 8 is also preferred in embodiments in which there is no integrated implementation on a printed circuit board.
  • the difference signal is a direct difference between left and right, i.e. a difference obtained by inverting one of the two signals and then calculating the addition between the one signal and the inverted other signal will.
  • other differences can be calculated, the z. This can be achieved, for example, by mathematically calculating a difference without an explicit phase shifter being present.
  • the corresponding "difference signals" can be calculated in the time domain or in the frequency domain or in an LPC domain. Neither with others In the exemplary embodiments, there is a phase shifter that does not generate a phase shift of 180°, but only of a value between 90° and 180°.
  • FIG. 10 shows another embodiment of the present invention, in which a distance measurement is performed to determine a distance between the corresponding loudspeaker 21 or 22 and the head or the side of the head or the ear of the listener.
  • These distance sensors are shown at 51, 52 and are preferably arranged in the headrest 24 next to the loudspeakers 21, 22, specifically inside the two loudspeakers, as shown in the right-hand part of FIG.
  • the distance measurement by the distance sensors 51, 52 serves to signal manipulation of the two drive signals 15a, 15b. This setting is made in order to achieve volume equalization and/or bass equalization and/or delay equalization for the two loudspeaker signals, ie the two drive signals 15a, 15b.
  • the level of the speaker signals is increased by a sound processor not shown in FIG. This can be achieved, for example, within the amplifiers 46, 48 if they are designed to be controllable.
  • the bass for the corresponding loudspeaker can also be increased, which can then in turn be achieved by the adjustable loudspeakers 46, 48 if they are designed as frequency-selective amplifiers or if a corresponding equalizer is provided.
  • a delay for one loudspeaker can also be set in comparison to the other loudspeaker, which can be achieved by a phase shifter before or after the corresponding amplifier 46, 48 in the corresponding signal train, i.e. for the corresponding control signal 15a, 15b.
  • a sound processor is arranged to reduce the level of the corresponding loudspeaker signal and/or the bass for that loudspeaker.
  • the delay for this speaker can be set in the Compared to the other speaker can be increased when a decrease in distance between the head and the speaker rule is detected.
  • a detector is positioned at each seat to detect whether the seat is actually occupied by a listener. If it is detected that the seat is occupied, the loudspeakers are activated as shown in FIGS. 1-9. If, on the other hand, it is established that one or more seats are not occupied, the loudspeakers for this seat or for these several seats are deactivated or their output level is greatly reduced in order to avoid unnecessary sound generation. It should be noted that the deactivation can be a complete deactivation, ie switching off, or a partial deactivation, ie a reduction in the output level by a significant amount, such as by at least 10 dB.
  • a preferred embodiment of the present invention resides within a mobile device, such as a mobile phone.
  • a mobile phone such as a mobile phone.
  • B. a mobile phone, a tablet, a notebook, etc.
  • the control device or the device for generating a control signal is loaded, for example, as a hardware element or as an app or as a program on the mobile phone.
  • the mobile phone is designed to receive the first audio signal and the second audio signal or multi-channel signal from any source, which can be local or on the Internet, and to generate the control signals depending on this.
  • These signals are transmitted from the mobile phone to the sound generator with the sound generator elements either by cable or wirelessly, for example using Bluetooth or WLAN.
  • it is necessary for the sound generator elements to have a battery supply or, in general, a power supply in order to achieve appropriate amplification for the received wireless signals, for example in the Bluetooth format or in the WLAN format.
  • aspects have been described in the context of a device, it should be understood that these aspects also represent a description of the corresponding method, so that a block or component of a device can also be understood as a corresponding method step or as a feature of a method step . Similarly, aspects that have been described in connection with or as a method step also represent a description of a corresponding block or represents details or features of a corresponding device.
  • Some or all of the method steps may be performed by (or using) hardware apparatus, such as a microprocessor, a programmable computer, or electronic circuitry. In some embodiments, some or more of the key process steps can be performed by such an apparatus.
  • embodiments of the invention may be implemented in hardware or in software. Implementation can be performed using a digital storage medium such as a floppy disk, DVD, Blu-ray Disc, CD, ROM, PROM, EPROM, EEPROM or FLASH memory, hard disk or other magnetic or optical memory, on which electronically readable control signals are stored, which can interact with a programmable computer system in such a way that the respective method is implemented. Therefore, the digital storage medium can be computer-readable.
  • a digital storage medium such as a floppy disk, DVD, Blu-ray Disc, CD, ROM, PROM, EPROM, EEPROM or FLASH memory, hard disk or other magnetic or optical memory, on which electronically readable control signals are stored, which can interact with a programmable computer system in such a way that the respective method is implemented. Therefore, the digital storage medium can be computer-readable.
  • Some exemplary embodiments according to the invention thus comprise a data carrier which has electronically readable control signals which are capable of interacting with a programmable computer system in such a way that one of the methods described herein is carried out.
  • exemplary embodiments of the present invention can be implemented as a computer program product with a program code, the program code being effective to carry out one of the methods when the computer program product runs on a computer.
  • the program code can also be stored on a machine-readable carrier, for example.
  • exemplary embodiments include the computer program for performing one of the methods described herein, the computer program being stored on a machine-readable medium.
  • an exemplary embodiment of the method according to the invention is therefore a computer program that has a program code for performing one of the methods described herein when the computer program runs on a computer.
  • a further exemplary embodiment of the method according to the invention is therefore a data carrier (or a digital storage medium or a computer-readable medium) on which the computer program for carrying out one of the methods described herein is recorded.
  • a further exemplary embodiment of the method according to the invention is therefore a data stream or a sequence of signals which represents the computer program for carrying out one of the methods described herein.
  • the data stream or sequence of signals may be configured to be transmitted over a data communications link, such as the Internet.
  • Another embodiment includes a processing device, such as a computer or programmable logic device, configured or adapted to perform any of the methods described herein.
  • a processing device such as a computer or programmable logic device, configured or adapted to perform any of the methods described herein.
  • Another embodiment includes a computer on which the computer program for performing one of the methods described herein is installed.
  • a further exemplary embodiment according to the invention comprises an apparatus or a system which is designed to transmit a computer program for carrying out at least one of the methods described herein to a recipient.
  • the transmission can take place electronically or optically, for example.
  • the recipient may be a computer, mobile device, storage device, or similar device.
  • the device or the system can, for example, comprise a file server for transmission of the computer program to the recipient.
  • a programmable logic device e.g., a field programmable gate array, an FPGA
  • a field programmable gate array with a Microprocessor cooperate to perform any of the methods described herein.
  • the methods are performed on the part of any hardware device. This can be universally replaceable hardware such as a computer processor (CPU) or hardware specific to the process such as an ASIC.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Multimedia (AREA)
  • Stereophonic System (AREA)
  • Circuit For Audible Band Transducer (AREA)
  • Fittings On The Vehicle Exterior For Carrying Loads, And Devices For Holding Or Mounting Articles (AREA)

Abstract

L'invention concerne un dispositif destiné à alimenter un espace en son comportant un premier haut-parleur et un second haut-parleur, ledit dispositif présentant les caractéristiques suivantes : un générateur de signal de commande (10) destiné à générer un premier signal de commande (15a) pour le premier haut-parleur et un second signal de commande (15b) pour le second haut-parleur, le générateur de signal de commande (10) présentant les caractéristiques suivantes : un étage générateur de signal mixte (12) servant à générer un premier signal mixte (13a) pour le premier signal de commande (15a) et un second signal mixte (13b) pour le second signal de commande (15b) à partir d'un premier signal de canal (6) ou d'un second signal de canal (8), de telle sorte que le premier signal mixte (13a) et le second signal mixte (13b) présentent une différence de phase, un étage mélangeur (14) destiné à mélanger le premier signal de canal (6) avec le premier signal mixte (13a), de manière à obtenir le premier signal de commande (15a), et à mélanger le second signal de canal (8) avec le second signal mixte (13b) de sorte à obtenir le second signal de commande (15b), et une interface (16) destinée à assurer la transmission du premier signal de commande (15a) au premier haut-parleur et à assurer la transmission du second signal de commande (15b) au second haut-parleur.
EP22751661.4A 2021-07-19 2022-07-13 Dispositif et procédé destinés à alimenter un espace en son Pending EP4374581A2 (fr)

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DE102021207693 2021-07-19
DE102021211051 2021-09-30
PCT/EP2022/069667 WO2023001673A2 (fr) 2021-07-19 2022-07-13 Dispositif et procédé destinés à alimenter un espace en son

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EP (1) EP4374581A2 (fr)
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AT507622B1 (de) * 2009-03-19 2010-09-15 Weingartner Bernhard Dipl Ing Ohraufliegender kopfhörer
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TW202318884A (zh) 2023-05-01
WO2023001673A2 (fr) 2023-01-26
US20240147184A1 (en) 2024-05-02
WO2023001673A3 (fr) 2023-04-27

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