EP1123638B1 - Vorrichtung und verfahren zur qualitätsbeurteilung von mehrkanaligen audiosignalen - Google Patents
Vorrichtung und verfahren zur qualitätsbeurteilung von mehrkanaligen audiosignalen Download PDFInfo
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- EP1123638B1 EP1123638B1 EP99965471A EP99965471A EP1123638B1 EP 1123638 B1 EP1123638 B1 EP 1123638B1 EP 99965471 A EP99965471 A EP 99965471A EP 99965471 A EP99965471 A EP 99965471A EP 1123638 B1 EP1123638 B1 EP 1123638B1
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- reference point
- loudspeaker
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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
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04S—STEREOPHONIC SYSTEMS
- H04S2420/00—Techniques used stereophonic systems covered by H04S but not provided for in its groups
- H04S2420/01—Enhancing the perception of the sound image or of the spatial distribution using head related transfer functions [HRTF's] or equivalents thereof, e.g. interaural time difference [ITD] or interaural level difference [ILD]
Definitions
- the measuring method described in DE-C-196 47 399 allows furthermore the quality assessment of stereo signals, i. H. two-channel signals.
- a non-linear Preprocessing that highlights transients in a frequency-selective manner and stationary signals decreased, with the left and right Channel of the audio test signal or the audio reference signal carried out.
- various detections the probability of error with the left channel of the audio reference signal and with the left channel of the audio test signal as input signals, with the right channel of the audio reference signal and with the right channel of the audio test signal as input signals, with the left channel of the preprocessed Audio reference signal and with the left channel of the preprocessed audio test signal as input signals and with the right channel of the preprocessed audio reference signal and with the right channel of the preprocessed audio test signal performed as input signals to measure for maintain the quality of the stereophonic audio test signal.
- a disadvantage of the known method for the hearing-adapted Quality assessment of audio signals is the fact that the stereo capability only on headphone playback is limited.
- Known quality assessment methods can also be used no directional characteristic of the human Consider ear, d. H. it doesn't matter if a Signal comes from behind, in front or from the side.
- Known measuring methods only work for headphone playback, at the the sound signal from the headphone speaker, the is usually arranged directly on the ear, exits and in the ear or in the process of quality assessment.
- WO-A-97 25 834 discloses processing a multi-channel Signals and EP-A-0 165 733 a method and an apparatus for measuring and correcting acoustic characteristics in a sound spring.
- the object of the present invention is a improved concept for quality assessment of audio signals to create that takes space effects into account.
- This task is accomplished by a quality assessment device according to claim 1 and by a method for Quality assessment according to claim 14 solved.
- the present invention is based on the finding that that the human listener who is ultimately at issue despite the presence of signals with any number Channels are only ever available to two ears.
- the directional hearing is due to the different impulse responses for different directions of incidence of sound signals into the human ear.
- the different Impulse responses for different directions of incidence in technology as header-related transfer functions or "Head Related Transfer Functions".
- Head-related transfer functions or "Head Related Transfer Functions”.
- the HRTFs and the room impulse response together lead to a sound change that can also be evaluated according to the invention by measuring systems, which do not explicitly model binaural effects, such as B. different masking thresholds for binaural Signals compared to monoaural signals, perception of phase shifts, precedent effects, etc.
- the extended Quality assessment of audio signals both the Head-related transfer functions (HRTFs) as well as room impulse responses be taken into account. It is also for the irrelevant auditory quality assessment according to the invention, whether a signal is a stereo signal, that of two Speakers for the left or right channel broadcast or whether the signal is a multi-channel signal that for example, has five channels and five speakers is broadcast, the z. B. in such a way Positioned that the loudspeakers on the left rear, left front, right rear, right front or front are.
- HRTFs Head-related transfer functions
- the device for quality assessment means for converting the audio reference signal into a first audio reference sum signal at a first reference point and into a second audio reference sum signal at a second reference point and a Means for converting the audio test signal into a first one Audio test sum signal at the first reference point and in second audio test sum signal at the second reference point, wherein the audio reference sum signals and the audio test sum signals one at the first and second reference points Superimposition of the respective channels by the plurality of Speakers are output, weighted with a respective Transfer function between the respective loudspeaker and the corresponding reference point.
- the audio reference sum signals and the audio test sum signals will eventually fed into a quality assessment facility, an indicator of the quality of the audio test signal to obtain.
- the quality assessment facility can be any known device, such as is disclosed in DE 196 47 399 C1, or how they in the international standard ITU-R BS 1387 (PEAQ) has been established.
- An advantage of the method according to the invention is the fact that if the audio signal is a stereo signal, the Influences of the listening room on everyone's signal propagation Speakers to each reference point, d. H. every ear, considered can be.
- Another advantage is the fact that the method applicable for audio signals with any number of channels is because the channels have appropriate transfer functions, which is the propagation of a signal from one Model loudspeakers to one ear on two sum signals be converted so that any method for quality assessment that is suitable for two channels, can be used.
- the individual transfer functions can usually by measurement using built-in microphones with an artificial head or with probe microphones with a human listeners. Particularly advantageous is the inventive method, however, if the Head-related transfer functions of any person are already known and for example on the Internet can be downloaded from an appropriate server. In this case the impulse response of a listening room, that can be measured or simulated with a certain present HRTF can be folded to a transfer function to obtain. This is particularly advantageous there where the listening room does not yet exist, d. H. where the sound properties of a room are simulated before the room is built at all, for example at the planning of concert halls or recording studios the sound properties to simulate and even before the construction of the listening room to optimize it.
- FIG. 1 shows a schematic block diagram of a device for quality assessment of an audio test signal that by encoding and decoding an audio reference signal is derived.
- the audio test signal and the audio reference signal each have a plurality of channels, wherein each channel through a speaker of a plurality of Speakers 11 to 15 that are in different positions positioned in an at least fictional room, audible can be made, and wherein two reference points 17, 18 to Simulation of hearing regarding the positions of the majority are defined by speakers 11 to 15.
- the device for quality assessment comprises means 19 for converting the audio reference signal into a first audio reference sum signal at the first reference point 17 and in a second audio reference sum signal at the second reference point 18 and for converting the audio test signal into a first one Audio test sum signal at the first reference point 17 and in a second audio test sum signal at the second reference point 18, the audio reference sum signals and the audio test sum signals at the first and second reference points 17, 18 an overlay of the respective channels by the A plurality of speakers 11 to 15 are deliverable, weighted with a respective transfer function ÜF11 to ÜF52 between the respective loudspeaker 11 to 15 and the corresponding one Reference points 17, 18 are.
- the device for Quality assessment also includes a device 20 for Quality assessment of the audio test sum signals taking into account the audio reference sum signals to a display the quality of the audio test signal at an output 21 to deliver.
- the device 19 for converting received includes the majority of transfer functions ÜF11 to ÜF52, which are either the HRTFs, though an anechoic room, d. H. a room in which no reflections occur, is considered, or the whole Transfer function of the room from one of the loudspeakers 1 to 5 to a reference point 1, 2.
- Fig. 1 is, the output signals of the speakers weighted the corresponding transfer functions.
- the Output signals when weighting the input signals with the corresponding transfer functions, are summed by means of a first summer 22 by first To get audio sum signals.
- a second totalizer 23 is provided, to the output signals of the transfer functions from the respective speakers 11 to 15 to the second reference point 18 sum to add the second audio sum signals deliver.
- both the audio test signal as well as the audio reference signal of the processing by means of subjected to the conversion device 19 such that for the audio reference signal and the audio test signal have the same ratios prevail, such that the device 20 for quality assessment for 2-channel signals only the quality the encoding / decoding measures and no other effects Disrupt measurement result.
- the device according to the invention is also for stereo signals with only two channels or for signals applicable with three, four or more than five channels. In in this case, only corresponding transfer functions need to be carried out added or omitted. Furthermore, be on it noted that the positioning of the speakers in Fig. 1 is only schematic. Correct positioning the loudspeaker with respect to the reference points is in the 2 and 3 for the example of 5-channel signals.
- the first digit always refers to the Loudspeaker, while the second digit refers to the Reference point, d. H. Reference point No. 1 (17) or reference point No. 2 (18).
- Fig. 2 shows a possible arrangement of the five speakers 11 to 15 with respect to a receiver 24, the head of which is shown in FIG. 2 is shown schematically in plan view. alternative the head 24 could be an artificial head.
- the head 24 includes the head 24 the first reference point 17 and the second reference point 18, d. H. the ears 17, 18 in the case of a human Handset or the built-in microphones 17, 18 at an artificial head 18.
- the header-related transfer functions (HRTFs) are shaded for example the head or shoulders of the listener and determined by different transmission times.
- arrow 31a for example, represents the transmission path from the first loudspeaker 11 to the first reference point 17
- the arrow 31b dashed in the area of the head 24 is drawn, the HRTF provides the first speaker 11 to the second reference point 18
- Arrow 32a the transfer function from the second speaker 12 to the first reference point, i. H. ÜF21 in Fig. 1,
- arrow 32b represents the transfer function from the second speaker 12 to the second reference point 18, d. H. ÜF22 in Fig.
- the first or second audio test sum signals result or audio reference sum signals, which in a any device 22 for quality assessment for 2-channel signals can be fed to a measure of the Quality of the audio test signal used in that shown in FIG Case is a 5-channel signal.
- Fig. 3 shows a schematic representation of transmission paths in a listening room 30, in which the loudspeakers 11, 12, 13, 14, 15 are arranged as in Fig. 2. additionally direct sound is an indirect path for everyone Speakers shown to the left ear 17. It was on it noted that the scenario in Fig. 3 is only partial reflects reality, because here reflections occur on all walls, floors and ceilings and further multiple reflections also exist. Specifically, the first speaker 11 further sound from the as it through a line 31c is shown on the front wall of the Room 30 is reflected and from there to the first reference point 17 arrives. The transfer function from the first Speaker 11 to the left ear 17, i. H. ÜF11 in Fig.
- the first possibility is to use one as in FIG. 3 shown, positioning of the speakers 11 to 15 to to choose the reference points 17 and 18. Then the first loudspeaker 11 excited by means of an excitation signal, whereupon arriving at the first reference point 17 Sound signal is measured, which is a superimposition of the Signals 31a, 31c when looking at Figure 3. Moreover the sound signal is measured at the second reference point 18, which is a superimposition of the signal 31b and one in Fig. 3 signal, not shown, could be that of the first Speaker 11 is output and on any wall like this it is reflected that it arrives at the second reference point 18.
- the transfer function from the first speaker to the first reference point 17 (ÜF11 in Fig. 1 can from the excitation signal and that measured at the first reference point 17 Sound signal can be calculated. If the speaker 11 with stimulated with an ideal impulse, it results at the reference points directly the respective impulse response that the Transmission of the sound signal in the time domain describes. However, this is only due to practical limitations a theoretical method. In practice, the speaker 11, however, excited with a pseudo noise signal. This The procedure for the other speakers 12 to 15 repeated in such a way that all other transfer functions ÜF21 to ÜF52 from the measured sound signal on the respective reference point and the excitation signal at the respective Have the speaker determined.
- Such sound measurements are independent of the fact whether measurement using two built-in microphones and one Artificial head or by means of two probe microphones and one Test person can be carried out, if only because of the very expensive probe microphones complex and expensive.
- HRTFs head-related transfer functions
- HRTFs head-related transfer functions
- a major advantage of this procedure is that it can also be used to simulate rooms, that are not yet built to before the actual construction a recording studio, for example, the same for optimal Sound propagation for certain speaker configurations to design. In this case it can no longer be spoken of that the space in which the quality of a coded and re-decoded audio test signal should actually exist. Instead, the room is only present in the simulation and therefore a fictitious one Room.
- test persons in such a listening room for example a standardized one Interception room can be at the optimal listening location sit or stand.
- many test subjects move during your head forward, back, left or right, which is also called translation.
- people usually move slightly the optimal listening position, d. H. people turn her head to the left and right, also called DF movements or rotation.
- d. H. people turn her head to the left and right, also called DF movements or rotation.
- d. H. the speaker 13 no longer exactly in the middle.
- a Average is taken to be a general statement about it to be able to make a certain coding / decoding process is perhaps optimal if the position of the Head is not changed at all, or that this at certain translations or DF movements or rotations of the head is no longer as cheap as another coding method.
- the "worst case" of the individual measurements be found out to make a statement about it can determine whether a particular coding / decoding method at a specific position of the head with respect to the five speakers is suboptimal in the case of 5-channel audio signals.
- quality assessments on the one hand for several positions of the reference points 17, 18 close the optimal reference listening position.
- measurements can also be made for other places are not at the reference listening position for example certain other seats in one Be able to judge recording studio to see if here Coding / decoding errors are more audible or not.
- the device according to the invention and the invention Process existing devices and processes for Quality assessment with a substantial amount of flexibility provided such that not only a quality assessment of audio signals with more than two channels but that a quality assessment for different Scenarios of positioning the reference points 17, 18 are played through with respect to the loudspeakers 11 to 15 can, and that the device according to the invention and the inventive Process even when designing sound studies or other listening rooms, such as. B. cinemas can be used can check the quality of certain coding / decoding methods to be able to judge in a certain room. Furthermore, the inventive method and the inventive Device for designing listening rooms to be the best for a particular room Coding methods from a variety of possible coding methods select.
- the transfer functions ÜF11 - ÜF52 can be different Types can be implemented in terms of circuitry.
- An implementation via an FIR filter for each is preferred Impulse response. It should be noted that for large Spaces that FIR filters can take up a considerable length, which for example at a sampling frequency of 48 kHz can be over 100,000 samples long. Here offers itself, the first milliseconds of that length, in the rather discrete reflections occur to represent more accurately than the Time range rather at the end of filters, where more diffuse reflections occur.
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Description
- Fig. 1
- ein schematisches Blockdiagramm einer erfindungsgemäßen Vorrichtung;
- Fig. 2
- ein schematisches Diagramm zur Ermittlung der Kopf-bezogenen Übertragungsfunktionen (HRTFs); und
- Fig. 3
- ein schematisches Blockdiagramm zur Darstellung der Situation in einem realen Abhörraum.
Claims (21)
- Vorrichtung zur Qualitätsbeurteilung eines Audiotestsignals, das durch Codierung und Decodierung von einem Audioreferenzsignal abgeleitet ist, wobei das Audiotestsignal und das Audioreferenzsignal jeweils eine Mehrzahl von Kanälen aufweisen, wobei jeder Kanal durch einen Lautsprecher (11 - 15) einer Mehrzahl von Lautsprechern, die an unterschiedlichen Positionen in einem zumindest fiktiven Raum (30) positioniert sind, hörbar gemacht werden kann, und wobei zwei Bezugspunkte (17, 18) des Gehörs bezüglich der Positionen der Mehrzahl von Lautsprechern definiert sind, mit folgenden Merkmalen:einer Einrichtung (19) zum Umwandeln des Audioreferenzsignals in ein erstes Audioreferenzsummensignal an dem ersten Bezugspunkt (17) und in ein zweites Audioreferenzsummensignal an dem zweiten Bezugspunkt (18) und zum Umwandeln des Audiotestsignals in ein erstes Audiotestsummensignal an dem ersten Bezugspunkt (17) und in ein zweites Audiotestsummensignal an dem zweiten Bezugspunkt (18), wobei die Audioreferenzsummensignale und die Audiotestsummensignale an dem ersten und an dem zweiten Bezugspunkt (17, 18) eine Überlagerung der jeweiligen Kanäle, die von der Mehrzahl von Lautsprechern (11 - 15) ausgebbar sind, gewichtet mit einer jeweiligen Übertragungsfunktion (ÜF11 - ÜF52) zwischen dem jeweiligen Lautsprecher und dem entsprechenden Bezugspunkt sind; undeiner Einrichtung (20) zur Qualitätsbeurteilung der Audiotestsummensignale unter Berücksichtigung der Audioreferenzsummensignale, um eine Anzeige der Qualität des Audiotestsignals zu liefern.
- Vorrichtung nach Anspruch 1, bei der die Übertragungsfunktionen (ÜF11 - ÜF52) zwischen den jeweiligen Lautsprechern (11 - 15) und den entsprechenden Bezugspunkten (17, 18) individuelle Kopf-bezogene Übertragungsfunktionen (HRTF) sind, um die unterschiedlichen Impulsantworten für unterschiedliche Schalleinfallsrichtungen in das menschliche Ohr (17, 18) zu berücksichtigen.
- Vorrichtung nach Anspruch 2, bei der die Übertragungsfunktion (ÜF11 - ÜF52) zwischen den jeweiligen Lautsprechern (11 - 15) und den entsprechenden Bezugspunkten (17, 18) durch eine Mittelung über eine Vielzahl von Individuen gewonnene mittlere Kopf-bezogene Übertragungsfunktionen (HTRFs) sind.
- Vorrichtung nach einem der vorhergehenden Ansprüche, bei der die Übertragungsfunktion (ÜF11 - ÜF52) zwischen dem jeweiligen Lautsprecher (11 - 15) und dem entsprechenden Bezugspunkt (17, 18) eine Übertragungsfunktion ist, die gleich der Faltung der Kopf-bezogenen Übertragungsfunktion mit einer Raumimpulsantwort ist, derart, daß die Schallreflexionen des Raums, in dem die Mehrzahl von Lautsprechern (11 - 15) und die beiden Bezugspunkte (17, 18) positioniert sind, berücksichtigt werden.
- Vorrichtung nach einem der vorhergehenden Ansprüche, bei der die Übertragungsfunktion (ÜF11 - ÜF52) zwischen den jeweiligen Lautsprechern (11 - 15) und dem entsprechenden Bezugspunkt (17, 18) gemittelte Übertragungsfunktionen sind, die das Ergebnis einer Mittelung einzelner Übertragungsfunktionen zwischen festen Lautsprecherpositionen und variierten Positionen der Bezugspunkte (17, 18) sind.
- Vorrichtung nach einem der Ansprüche 1 bis 4, bei der die Einrichtung (19) zum Umwandeln angeordnet ist, um für verschiedene Positionen des ersten und des zweiten Bezugspunkts (17, 18) bezüglich fester Lautsprecherpositionen Übertragungsfunktionen zu liefern, und bei der die Einrichtung zur Qualitätsbeurteilung (20) angeordnet ist, um für unterschiedliche Übertragungsfunktionen die Anzeige der Qualität des Audiotestsignals zu liefern und für die Anzeige der geringsten Qualität die Positionen der Bezugspunkte (17, 18) zu liefern.
- Vorrichtung nach einem der vorhergehenden Ansprüche, bei der der Raum (30) ein standardisierter Referenzabhörraum ist und die beiden Bezugspunkte (17, 18) die Gehörorgane einer Testperson an einer Referenzabhörposition simulieren.
- Vorrichtung nach einem der Ansprüche 1 bis 6, bei der der Raum (30) ein Tonstudio ist und die beiden Bezugspunkte die Gehörorgane einer Testperson an einer beliebigen Sitz/Steh-Position in dem Raum simulieren.
- Vorrichtung nach einem der Ansprüche 5 bis 8, bei der die verschiedenen Positionen des ersten und des zweiten Bezugspunkts (17, 18) nur gering von einer Referenzposition abweichen, um eine Peilbewegung einer Testhörperson zu simulieren.
- Vorrichtung nach einem der Ansprüche 5 bis 8, bei der die verschiedenen Positionen des ersten und des zweiten Bezugspunkts stark von der Referenzposition abweichen, um eine Kopfdrehung einer Testhörperson zu simulieren.
- Vorrichtung nach einem der vorhergehenden Ansprüche, bei der das Audiotestsignal fünf Kanäle aufweist, die ein linker hinterer, ein rechter hinterer, ein linker vorderer, ein rechter vorderer und ein mittlerer vorderer Kanal sind.
- Vorrichtung nach einem der Ansprüche 1 bis 10, bei der das Audiotestsignal ein Stereosignal ist.
- Vorrichtung nach einem der vorhergehenden Ansprüche, bei der die Einrichtung (19) zum Umwandeln folgende Merkmale aufweist:für jede Lautsprecher-Bezugspunkt-Kombination ein FIR-Filter, wobei die Filterkoeffizienten jedes FIR-Filters durch die Übertragungsfunktion der Übertragungsstrecke von dem entsprechenden Lautsprecher zu dem entsprechenden Bezugspunkt bestimmt sind;einen ersten Summierer (22) für den ersten Bezugspunkt (17) zum Summieren der Ausgangssignale der FIR-Filter (ÜF11 - ÜF51), die Übertragungsstrecken zu dem ersten Bezugspunkt (17) darstellen, um das erste Audiotestsummensignal bzw. das erste Audioreferenzsummensignal zu liefern; undeinen zweiten Summierer (23) für den zweiten Bezugspunkt (18) zum Summieren der Ausgangssignale der FIR-Filter (ÜF12 - ÜF52), die eine Übertragungsstrecke zu dem zweiten Bezugspunkt (18) darstellen, um das zweite Audiotestsummensignal bzw. das zweite Audioreferenzsummensignal zu liefern.
- Verfahren zur Qualitätsbeurteilung eines Audiotestsignals, das durch Codierung und Decodierung von einem Audioreferenzsignal abgeleitet ist, wobei das Audiotestsignal und das Audioreferenzsignal jeweils eine Mehrzahl von Kanälen aufweisen, wobei jeder Kanal durch einen Lautsprecher (11 - 15) einer Mehrzahl von Lautsprechern, die an unterschiedlichen Positionen in einem zumindest fiktiven Raum (30) positioniert sind, hörbar gemacht werden kann, und wobei zwei Bezugspunkte (17, 18) bezüglich der Positionen der Mehrzahl von Lautsprechern definiert sind, mit folgenden Schritten:Umwandeln (19) des Audioreferenzsignals in ein erstes Audioreferenzsummensignal an dem ersten Bezugspunkt (17) und in ein zweites Audioreferenzsummensignal an dem zweiten Bezugspunkt (18);Umwandeln des Audiotestsignals in ein erstes Audiotestsummensignal an dem ersten Bezugspunkt (17) und in ein zweites Audiotestsummensignal an dem zweiten Bezugspunkt (18);Gewichten der jeweiligen Kanäle, die von der Mehrzahl von Lautsprechern (11 - 15) ausgebbar sind, mit einer jeweiligen Übertragungsfunktion (ÜF11 - ÜF52) zwischen dem jeweiligen Lautsprecher und dem entsprechenden Bezugspunkt;Überlagern der gewichteten Kanäle an dem ersten bzw. an dem zweiten Bezugspunkt (17, 18), um die Audioreferenzsummensignale und die Audiotestsummensignale zu erhalten; undLeiten der Audiotestsummensignale und der Audioreferenzsummensignale zu einer Einrichtung (20) zur Qualitätsbeurteilung der Audiotestsummensignale unter Berücksichtigung der Audioreferenzsummensignale, um eine Anzeige der Qualität des Audiotestsignals zu erhalten.
- Verfahren nach Anspruch 14, bei dem dem Schritt des Umwandelns (19) folgender Schritt vorausgeht:Erhalten der einzelnen Übertragungsfunktionen (ÜF11-ÜF52) zwischen jedem Lautsprecher (11 - 15) und jedem Bezugspunkt (17, 18).
- Verfahren nach Anspruch 15, bei dem der Schritt des Erhaltens folgende Teilschritte aufweist:Anregen eines Lautsprechers (11 - 15) mit einem Anregungssignal;Messen des Signals an jedem Bezugspunkt (17, 18);Ermitteln der Übertragungsfunktion zwischen dem angeregten Lautsprecher und dem ersten Bezugspunkt (17);Ermitteln der Übertragungsfunktion zwischen dem angeregten Lautsprecher und dem zweiten Bezugspunkt (18); undWiederholen der Schritte des Anregens, des Messens und des Ermittelns, bis alle Lautsprecher (11 - 15) angeregt worden sind, um die einzelnen Übertragungsfunktionen zu erhalten.
- Verfahren nach Anspruch 16, bei dem der erste und der zweite Bezugspunkt (17, 18) die Ohren eines menschlichen Hörers sind.
- Verfahren nach Anspruch 16, bei dem der erste und der zweite Bezugspunkt die eingebauten Mikrophone eines Kunstkopfes sind.
- Verfahren nach einem der Ansprüche 16 bis 18, bei dem das Anregungssignal ein Pseudorauschsignal ist.
- Verfahren nach Anspruch 15, bei dem der Schritt des Erhaltens folgende Teilschritte aufweist:Zugreifen auf eine Kopf-bezogene Übertragungsfunktion (HRTF) für eine bestimmte Positionierung eines Lautsprechers (11 - 15) zu dem ersten Bezugspunkt (17);Ermitteln der Raumimpulsantwort für die Position des Lautsprechers in dem Raum;Falten der Kopf-bezogenen Übertragungsfunktion (HRTF) mit der Raumimpulsantwort, um die Übertragungsfunktion von dem Lautsprecher zu dem ersten Bezugspunkt (17) zu erhalten;Wiederholen der Schritte des Zugreifens, des Ermittelns und des Faltens, um die Übertragungsfunktion (ÜF11 - ÜF52) von dem Lautsprecher zu dem zweiten Bezugspunkt zu erhalten; undDurchführen der Schritte des Zugreifens, des Ermittelns, des Faltens und des Wiederholens für jeden weiteren Lautsprecher, um alle einzelnen Übertragungsfunktionen zu erhalten.
- Verfahren nach Anspruch 19, bei dem die Raumimpulsantwort durch eine Simulation des Raumes ermittelt wird.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19902317A DE19902317C1 (de) | 1999-01-21 | 1999-01-21 | Vorrichtung und Verfahren zur Qualitätsbeurteilung von mehrkanaligen Audiosignalen |
DE19902317 | 1999-01-21 | ||
PCT/EP1999/009979 WO2000044196A2 (de) | 1999-01-21 | 1999-12-15 | Vorrichtung und verfahren zur qualitätsbeurteilung von mehrkanaligen audiosignalen |
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EP1123638A2 EP1123638A2 (de) | 2001-08-16 |
EP1123638B1 true EP1123638B1 (de) | 2002-03-20 |
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EP99965471A Expired - Lifetime EP1123638B1 (de) | 1999-01-21 | 1999-12-15 | Vorrichtung und verfahren zur qualitätsbeurteilung von mehrkanaligen audiosignalen |
Country Status (5)
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US (1) | US7024259B1 (de) |
EP (1) | EP1123638B1 (de) |
AT (1) | ATE214862T1 (de) |
DE (2) | DE19902317C1 (de) |
WO (1) | WO2000044196A2 (de) |
Families Citing this family (9)
Publication number | Priority date | Publication date | Assignee | Title |
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WO2002052895A1 (de) * | 2000-12-22 | 2002-07-04 | Harman Audio Electronic Systems Gmbh | Anordnung zur auralisation eines lautsprechers in einem abhörraum bei beliebigen eingangssignalen |
US7715575B1 (en) * | 2005-02-28 | 2010-05-11 | Texas Instruments Incorporated | Room impulse response |
EP1900252B1 (de) * | 2005-05-26 | 2013-07-17 | Bang & Olufsen A/S | Aufzeichnung, synthese und wiedergabe von schallfeldern in einem gehäuse |
US8612237B2 (en) * | 2007-04-04 | 2013-12-17 | Apple Inc. | Method and apparatus for determining audio spatial quality |
US8335331B2 (en) * | 2008-01-18 | 2012-12-18 | Microsoft Corporation | Multichannel sound rendering via virtualization in a stereo loudspeaker system |
KR101600082B1 (ko) * | 2009-01-29 | 2016-03-04 | 삼성전자주식회사 | 오디오 신호의 음질 평가 방법 및 장치 |
FR2976759B1 (fr) * | 2011-06-16 | 2013-08-09 | Jean Luc Haurais | Procede de traitement d'un signal audio pour une restitution amelioree. |
DE102012000931A1 (de) * | 2012-01-19 | 2013-07-25 | Volkswagen Ag | Verfahren zur Diagnose eines Audiosystems eines Kraftfahrzeuges |
JP2014075753A (ja) * | 2012-10-05 | 2014-04-24 | Nippon Hoso Kyokai <Nhk> | 音響品質推定装置、音響品質推定方法及び音響品質推定プログラム |
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JPS60165733A (ja) * | 1984-02-08 | 1985-08-28 | Toshiba Corp | ストロボ走査型電子顕微鏡装置 |
DE3580402D1 (de) * | 1984-05-31 | 1990-12-13 | Pioneer Electronic Corp | Verfahren und geraet zur messung und korrektur der akustischen charakteristik eines schallfeldes. |
CA2184160C (en) * | 1994-02-25 | 2006-01-03 | Henrik Moller | Binaural synthesis, head-related transfer functions, and uses thereof |
US5596644A (en) * | 1994-10-27 | 1997-01-21 | Aureal Semiconductor Inc. | Method and apparatus for efficient presentation of high-quality three-dimensional audio |
WO1997025834A2 (en) * | 1996-01-04 | 1997-07-17 | Virtual Listening Systems, Inc. | Method and device for processing a multi-channel signal for use with a headphone |
DE19647399C1 (de) * | 1996-11-15 | 1998-07-02 | Fraunhofer Ges Forschung | Gehörangepaßte Qualitätsbeurteilung von Audiotestsignalen |
US6223090B1 (en) * | 1998-08-24 | 2001-04-24 | The United States Of America As Represented By The Secretary Of The Air Force | Manikin positioning for acoustic measuring |
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- 1999-12-15 EP EP99965471A patent/EP1123638B1/de not_active Expired - Lifetime
- 1999-12-15 AT AT99965471T patent/ATE214862T1/de active
- 1999-12-15 US US09/889,697 patent/US7024259B1/en not_active Expired - Lifetime
- 1999-12-15 WO PCT/EP1999/009979 patent/WO2000044196A2/de active IP Right Grant
- 1999-12-15 DE DE59901036T patent/DE59901036D1/de not_active Expired - Lifetime
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DE19902317C1 (de) | 2000-01-13 |
EP1123638A2 (de) | 2001-08-16 |
US7024259B1 (en) | 2006-04-04 |
WO2000044196A2 (de) | 2000-07-27 |
WO2000044196A3 (de) | 2000-10-19 |
ATE214862T1 (de) | 2002-04-15 |
DE59901036D1 (de) | 2002-04-25 |
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