WO2003075610A1 - Dispositif et procede de transduction de signal acoustique - Google Patents

Dispositif et procede de transduction de signal acoustique Download PDF

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Publication number
WO2003075610A1
WO2003075610A1 PCT/JP2002/009237 JP0209237W WO03075610A1 WO 2003075610 A1 WO2003075610 A1 WO 2003075610A1 JP 0209237 W JP0209237 W JP 0209237W WO 03075610 A1 WO03075610 A1 WO 03075610A1
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WO
WIPO (PCT)
Prior art keywords
listener
signal
transaural
ears
reproduction
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Application number
PCT/JP2002/009237
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English (en)
Japanese (ja)
Inventor
Kazuhiro Kawana
Toshio Saito
Hareo Hamada
Noriyuki Hanawa
Original Assignee
Dimagic Co., Ltd.
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.)
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Publication date
Application filed by Dimagic Co., Ltd. filed Critical Dimagic Co., Ltd.
Publication of WO2003075610A1 publication Critical patent/WO2003075610A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04S—STEREOPHONIC SYSTEMS 
    • H04S3/00—Systems employing more than two channels, e.g. quadraphonic

Definitions

  • the present invention provides an audio signal for binaural reproduction for reproducing a virtual sound source from a transaural reproduction audio signal for reproducing a virtual sound source using two speakers via a speaker mounted on both ears of a listener.
  • the present invention relates to a conversion method and a conversion device for generating a conversion. Background art
  • sp1 and sp2 which are arranged at regular intervals. It is assumed that listening is performed with the left and right symmetrical axes. However, even if the user normally uses the speakers spl and sp2 for viewing, the viewing using the speakers at night or the like causes noise to the neighborhood, so the volume must be reduced or the speaker espl, It is common to watch using esp2.
  • the head-related acoustic transfer function which is the acoustic transfer function from the sound source position to the listener's binaural ears, and use the sounds reproduced from the two speakers spl and sp2 to reach the listener's binaural ears.
  • a device that controls the input sound is called a transaural system.
  • a technique that controls the sound input to the listener's both ears by the sound reproduced from the speaker by focusing on the head acoustic transfer function is called a binaural system.
  • This technique is known as a means of solving the problem of localization in the head.
  • transaural speech it is desired to convert transaural speech to binaural speech in order to support both the transaural system and the binaural system.
  • a binaural sound is obtained by using a transfer function from the speaker that reproduces the transaural sound to the listener's both ears and convolving with the transaural sound.
  • transaural audio generated assuming a standard speaker arrangement as shown in Fig. 1 opening angle between the listener and the left and right speakers is about 90 to 60 degrees
  • conversion to binaural sound involves complicated filtering, it is difficult to cope with the above-mentioned phenomenon of localization rise and the case where the effect of the reproduced speaker cannot be ignored.
  • the present invention has been proposed to solve the above-mentioned problems of the prior art, and its object is to easily reproduce a speaker signal from an acoustic signal generated for two speakers, that is, for transaural reproduction. That is, it is an object of the present invention to provide a method and apparatus for converting an audio signal for binaural reproduction. Invention
  • an audio signal conversion device provides a transaural reproduction signal conversion for converting an audio signal output from a plurality of speakers into a transaural reproduction signal from two speakers.
  • the transaural sound output from the transoral reproduction signal converter is superimposed on a signal having the transfer characteristics from two speakers to the listener's ears as elements, and reproduced by the transoral system.
  • a transaural-to-binaural converter that converts a sound signal reaching the listener's both ears to a binaural signal.
  • the transaural reproduction signal converter has a filter characteristic according to a reproduction method in which two speakers are arranged close to each other.
  • the reproduction method in which two spikes are arranged close to each other means that the opening angle between the listener and the left and right speakers is about 30 degrees or less, and preferably, the opening angle is about 10 degrees.
  • This is a stereo dipole playback system that uses a speed arrangement.
  • the transaural reproduction signal converter provides a position information for sound image localization in order to convert into a sound signal in both ears of a listener, and a speaker reproduction for canceling a crosstalk generated at the time of speaker reproduction. It consists of a regenerative equalizer.
  • the transaural reproduction signal converter converts the sound signal into sound signals from both ears of the listener, and provides position information for sound image localization. It is composed of filters that have the characteristics of integrating a regenerative equalizer.
  • the transaural-to-binaural converter comprises a transaural-to-binaural conversion filter and a speaker-equalizer playback equalizer having the inverse characteristic of the path from the speaker to the listener's eardrum.
  • the transaural-to-binaural conversion filter has information on a path from the speaker directly to the listener's both ears and a path from the speaker directly to the listener's both ears and a path from the speaker to the listener's both ears.
  • the sound signal conversion method according to the present invention is characterized in that a transaural reproduction signal is superimposed on a signal having a transfer characteristic from two spikes to a listener's both ears as an element, and is reproduced by a transaural system. And a binaural signal corresponding to an acoustic signal reaching both ears of the listener.
  • the transfer function from the speaker to the listener's both ears is reflected directly on the path from the speaker to the listener's both ears and reflected on the floor and the listener's both ears.
  • the information that has the information of the route to the route is used.
  • a transfer function from the loudspeaker to the listener's both ears to which information having the inverse characteristic of the path from the speaker to the listener's eardrum is used.
  • a sound signal that simulates a sound field reproduced by a plurality of speakers in reproduction using a transaural system that is, a transaural sound
  • a transaural sound can be used for reproducing a speaker.
  • conversion to an audio signal that provides the effect of reproducing multiple speakers, that is, a binaural sound becomes possible.
  • FIG. 1 is a plan view showing a standard two speaker arrangement
  • FIG. 2 is a plan view showing a plurality of speaker arrangements.
  • FIG. 3 is a block diagram showing an embodiment of an audio signal conversion device according to the present invention
  • FIG. 4 is a plan view showing a speaker arrangement according to a reproduction system in which two speakers are arranged in close proximity
  • FIG. Plan view showing the path from the two speakers to the listener's both ears It is.
  • FIG. 6 is a block diagram showing an example of the transaural system
  • FIG. 7 is a block diagram showing another example of the transaural system.
  • FIG. 8 is a side view showing two paths from a speaker to a listener
  • FIG. 9 is a block diagram showing an example of a transaural-to-binaural conversion filter
  • FIG. It is a block diagram which shows the other example of a binaural conversion filter.
  • FIG. 11 is a plan view showing a reproduction process via the quick force
  • FIG. 12 is a block diagram showing a path of an acoustic signal from a plurality of speeds to the quick force
  • Fig. 13 is a graph showing the characteristics from the speaker to the listener's binaural ears, assuming a reproduction system in which two speakers are arranged close to each other, and shows the relationship between frequency and amplitude. The graph shows the characteristics from the loudspeaker to the listener's both ears assuming the proposed reproduction method, and shows the relationship between frequency and phase.
  • Fig. 15 is a graph showing the time-series characteristics from the speaker assuming the playback method in which two speakers are arranged close to each other and the listener's both ears.
  • Fig. 16 is a graph showing the characteristics of a speaker assuming a standard speaker arrangement. This is a graph showing the characteristics up to the listener's both ears, showing the relationship between frequency and amplitude.
  • Figure 17 is a graph showing the characteristics from the speaker assuming a standard speaker arrangement to the listener's binaural ears, showing the relationship between frequency and phase, and Figure 18 assuming a standard speaker arrangement. It is a graph which shows the time series characteristic from a speaker to a listener's both ears.
  • Fig. 19 is a graph showing the characteristics of the filter with information on the path from the loudspeaker directly to the listener's binaural ears and the path reflected from the floor to the listener's binaural ears, showing the relationship between frequency and amplitude.
  • Reference numeral 20 denotes a graph showing the characteristics of a filter having information on a path directly from the speaker to the listener's binaural ear and information on a path reflected from the floor to the listener's binaural ear, and shows the relationship between frequency and phase.
  • Fig. 21 is a graph showing the time-series characteristics of a filter with information on the path from the loudspeaker directly to the listener's binaural ears and the path reflected on the floor and reaching the listener's binaural ears.
  • FIG. 4 is a graph showing characteristics of a filter having characteristics of an oral-to-binaural converter and a reproduction equalizer for reproducing a speaker, and shows a relationship between frequency and amplitude.
  • Fig. 23 is a graph showing the characteristics of a filter having the characteristics of a transaural-to-binaural converter and a reproduction equalizer for speaker reproduction, showing the relationship between frequency and phase.
  • 5 is a graph showing time-series characteristics of a filter having characteristics of a binaural converter and a reproduction equalizer for reproducing a speaker.
  • Fig. 25 is a graph showing the characteristics of a filter that combines the characteristics of the filter shown in Fig. 22 with the characteristics of a reproduction equalizer for speaker reproduction, showing the relationship between frequency and amplitude.
  • Fig. 22 is a graph showing the characteristics of a filter that combines the characteristics of the filter shown in Fig. 22 with the characteristics of a reproduction equalizer for speaker reproduction, and shows the relationship between frequency and phase.
  • 7 is a graph showing the time-series characteristics of the filter having the characteristics of the filter shown in FIG. BEST MODE FOR CARRYING OUT THE INVENTION
  • a transaural system for generating an input signal a reproduction system in which two speakers are arranged in close proximity to the front of a listener and two speakers are arranged in close proximity is used.
  • the speakers are arranged close to the front of the listener as shown in FIG. This is because in a transaural system with a standard speaker arrangement, sound field reproduction could be obtained only at the assumed control points, whereas in a reproduction method with two speakers arranged in close proximity, the It is characterized by having a good mouth bust even with respect to the rotation and movement of the head of the listener due to the geometrical arrangement of bringing the listener closer to the front of the listener. For this reason, if the transaural sound input to the present embodiment is generated for a playback method in which two speakers are arranged close to each other, the characteristics of the filter used when converting to binaural sound are also considered. You can expect mouth bust.
  • the transfer function from the two speeds at which the transaural sound is reproduced to the listener's both ears is convolved to obtain the binaural sound. What is important at this time is the characteristics of the transfer function from the loudspeaker to the listener's both ears.
  • the transfer function from the loudspeaker to the listener's both ears is as shown in Figs. 13 to 15 because the beakers are placed in front of the listener. Shows simple characteristics.
  • the filter has a simple fill-in characteristic and the values converge quickly as shown in Fig. 15 even in the time series.
  • the transfer function from the speaker to the listener's both ears is as shown in Fig. 16 to Fig. 18. Peaks and dips are more conspicuous and show complex characteristics as compared to when a playback method is assumed. Therefore, assuming a conventional speaker arrangement, the values in the time series are as shown in Fig. 18 as shown in Fig. 18 as in the speaker arrangement by the reproduction method in which the two speakers are arranged close to each other. It does not converge quickly and requires many sum-of-products operations and storage space to implement.
  • trans-aural audio can be converted to binaural audio by performing a simpler fill-in process than in the past. can do.
  • the conversion process since the conversion process only needs to perform a simple fill process, it can flexibly cope with optimization to specific conditions.
  • the signal for transaural reproduction according to the present invention is not necessarily limited to a reproduction method in which two speakers are arranged close to each other, and has a high speed and a large capacity even though it has characteristics as shown in FIGS.
  • the processing device it is possible to use a signal for transaural reproduction generated by a conventional reproduction method in which a pair of speakers is arranged at a distance.
  • V Transfer characteristics from the position from which sound is supposed to be reproduced to the listener's binaural ears (or a filter having such transfer characteristics).
  • V Filters having characteristics equivalent to V and P processing.
  • W playback equalizer for speaker playback.
  • C A filter that has characteristics equivalent to those of C and W processing.
  • ⁇ ' Sound that reaches the listener's eardrum when the converted binaural sound is played back using a speaker.
  • reference numeral 1 denotes a converter for converting an acoustic signal S output from a plurality of speakers into a signal for trans-real reproduction ⁇ , and this converter 1 is used in both ears of a listener.
  • a filter V that gives positional information for sound image localization for conversion into an acoustic signal ⁇ , and a reproduction equalizer ⁇ ⁇ ⁇ ⁇ for speaker reproduction that cancels crosstalk that occurs during speedy reproduction.
  • a trans-binaural converter 3 is provided via an analog-to-digital converter (ADC) 2 for converting a transaural reproduction signal into a digital signal.
  • ADC analog-to-digital converter
  • the transaural-to-binaural converter 3 superimposes the input transaural sound ⁇ on a filter that has a transfer characteristic from two speakers to the listener's both ears as an element, thereby forming a transaural system.
  • a signal (binaural signal) corresponding to an acoustic signal that reaches the listener's both ears when reproduced by is generated.
  • the transfer function used in this converter 3 has simple characteristics as shown in Fig. 13 to Fig. 15. It has.
  • the output side of the transaural-to-binaural converter 3 is connected to a digital-to-analog converter (DAC) 4 for converting the binaural signal generated by the converter 3 to an analog signal.
  • DAC digital-to-analog converter
  • transaural reproduction signal converter 1 a specific configuration of the transaural reproduction signal converter 1 will be described.
  • a plurality of acoustic signals S which are originally assumed to be reproduced from different speeds, have characteristics based on the head acoustic transfer function.
  • desired position information to be localized when reproduced is given.
  • the sound E at the listener's both ears is controlled to be equivalent to the following equation.
  • FIG. 6 shows an example of the filter V and the reproduction equalizer P.
  • the outputs of a plurality of speakers sp1 to sp5 are connected to the left and right speakers s ⁇ 1, sp Filters V1 to V10 that convert to outputs to 2 and outputs from filters VI to VI0
  • reproduction equalizers P 1 to P 4 for canceling crosstalk are provided.
  • Equation 4 Furthermore, in the playback system where two speakers are arranged close to each other, when designing a filter that performs these two processes at once, a method that integrates optimization by the least squares method and Regularization in the frequency domain In some cases, a value calculated from the following Equation 5 may be used.
  • Isseki is a variable that determines to weight of how much the section F auto penalty.
  • A represents the transfer function from the position where the sound image is to be localized to the listener's both ears. This design method is effective in reducing transient peaks and dips, which are often problems in audio playback systems, and in calculating a filter with excellent audibility.
  • the transaural to binaural converter 3 is composed of transaural to pinaural conversion filters C1, C2, C3, C4, and playback loudspeaker equalizers W1, W2. ing.
  • FIGS. 19 to 21 show the characteristics of the filter used for conversion in the present embodiment.
  • the filters C1, C2, C3, and C4 which have the characteristics shown in Fig. 19 to Fig. 21, are used to direct the sound from the speaker's force to the listener's both ears. It has the characteristics of a philosophy with information on the route to. Therefore, when this filter is used, a filter that reflects from the speaker to the floor and has information on the path to the listener's both ears is used. Since the sound reflected on the floor and reaches both ears can be reproduced, the phenomenon that the sound image rises can be suppressed.
  • the two filters C and W are separately provided, but in the present invention, it is also possible to perform processing using one filter having these two characteristics.
  • the embodiment of FIG. 10 uses filters C ′ :! to C′4 having characteristics equivalent to the two filters C and W. These filters C, 1 and C, 4 , C, 2 and C, 3 are shown in Figs.
  • the filters having the characteristics shown in Figs. 22 to 24 are the filters C1 to C4 shown in Figs. 13 to 15 (the characteristics in the case of the speaker arrangement by the reproduction system in which two speakers are arranged close to each other. )
  • a filter with the characteristics of the playback equalizers W1 and W2 for speaker playback are the characteristics of the playback equalizers W1 and W2 for speaker playback.
  • This has the inverse characteristic of the path from the speaker e spl, e sp 2 to the listener's eardrum, and thus suppresses the phenomenon in which the sound is distorted while reaching the listener's eardrum from the earspy.
  • the transfer function from the speaker to the listener's both ears has information on the path from the speed to the listener's both ears and the path from the speaker directly to the floor and from the floor to the both ears.
  • c the fill evening is shown in FIG. 2. 5 to FIG. 2 7 fill evening with properties processed by vessel, fill evening characteristics considering reflection component from the floor as shown in FIG. 8 (FIGS. 1 9 to 21) and the characteristics of the playback equalizers W l and W 2 as shown in Fig. 11 to suppress the rise of the sound image. It can also be expected to suppress the phenomenon that the sound is distorted while reaching the eardrum.
  • the signal processed by the transaural-to-binaural-to-neural converter 3 is converted from a digital signal to an analog signal by the DAC 4, passes through the amplifier 5, and passes through the speaker es 1. , reproduced from esp 2.
  • the reproduced signal becomes sound equivalent to transaural reproduction in both ears of the listener as shown in FIG. 12, and is perceived as sound coming from a desired position.
  • the desired sound E in both ears of the listener and the sound E 'reproduced after being converted into binaural sound are equivalent.
  • the sound signal generated for the two speaker reproduction that is, the transaural reproduction
  • the audio signal is transmitted through the earspeak, that is, the binaural reproduction is performed.
  • the same effect as in the case of oral reproduction can be obtained.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Stereophonic System (AREA)
  • Circuit For Audible Band Transducer (AREA)

Abstract

L'invention concerne un dispositif de transduction de signal acoustique, qui comprend : un transducteur (1) de signal de lecture transauriculaire pour convertir des signaux acoustiques produits par des haut-parleurs en signaux destinés à être restitués de manière transauriculaire par deux haut-parleurs ; et un transducteur (3) transauriculaire binauriculaire pour superposer les sons transauriculaires, produits par le transducteur (1) de signal de lecture transauriculaire, sur les signaux contenant les caractéristiques de transfert provenant des deux haut-parleurs et destinés à être perçus par l'auditeur, comme éléments, et convertir les signaux superposés en signaux binauriculaires correspondant aux signaux acoustiques atteignant les oreilles de l'auditeur lorsque les signaux sont restitués par un système transauriculaire. Ce n'est qu'en soumettant à une conversion simple les signaux acoustiques produits en vue d'une restitution par deux haut-parleurs, c.-à-d. restitution transauriculaire, qu'on obtient le même effet de restitution transauriculaire, produit lorsque l'auditeur utilise des écouteurs (restitution binauriculaire).
PCT/JP2002/009237 2002-03-01 2002-09-10 Dispositif et procede de transduction de signal acoustique WO2003075610A1 (fr)

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JP2002-56512 2002-03-01
JP2002056512A JP3947766B2 (ja) 2002-03-01 2002-03-01 音響信号の変換装置及び方法

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1699263A1 (fr) * 2003-12-24 2006-09-06 Mitsubishi Denki Kabushiki Kaisha Procede de reproduction de signal acoustique

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010016525A (ja) * 2008-07-02 2010-01-21 Sony Corp 音響処理装置および音響処理方法
JP2011244292A (ja) * 2010-05-20 2011-12-01 Shimizu Corp バイノーラル再生システム
JP2023139706A (ja) * 2022-03-22 2023-10-04 ヤマハ株式会社 音響システムおよび電子楽器

Citations (3)

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Publication number Priority date Publication date Assignee Title
JPH09191500A (ja) * 1995-09-26 1997-07-22 Nippon Telegr & Teleph Corp <Ntt> 仮想音像定位用伝達関数表作成方法、その伝達関数表を記録した記憶媒体及びそれを用いた音響信号編集方法
JPH09327099A (ja) * 1996-06-06 1997-12-16 Sony Corp 音響再生装置
JP2000115899A (ja) * 1998-09-30 2000-04-21 Open Heart:Kk ヘッドホンによる再生音聴取における音像頭外定位方法、及び、そのための装置

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH09191500A (ja) * 1995-09-26 1997-07-22 Nippon Telegr & Teleph Corp <Ntt> 仮想音像定位用伝達関数表作成方法、その伝達関数表を記録した記憶媒体及びそれを用いた音響信号編集方法
JPH09327099A (ja) * 1996-06-06 1997-12-16 Sony Corp 音響再生装置
JP2000115899A (ja) * 1998-09-30 2000-04-21 Open Heart:Kk ヘッドホンによる再生音聴取における音像頭外定位方法、及び、そのための装置

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1699263A1 (fr) * 2003-12-24 2006-09-06 Mitsubishi Denki Kabushiki Kaisha Procede de reproduction de signal acoustique
EP1699263A4 (fr) * 2003-12-24 2007-08-08 Mitsubishi Electric Corp Procede de reproduction de signal acoustique

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