EP0664660B1 - Appareil de reproduction de signaux audio - Google Patents

Appareil de reproduction de signaux audio Download PDF

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Publication number
EP0664660B1
EP0664660B1 EP95104929A EP95104929A EP0664660B1 EP 0664660 B1 EP0664660 B1 EP 0664660B1 EP 95104929 A EP95104929 A EP 95104929A EP 95104929 A EP95104929 A EP 95104929A EP 0664660 B1 EP0664660 B1 EP 0664660B1
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EP
European Patent Office
Prior art keywords
transfer characteristics
audio signal
signal
head
listener
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.)
Expired - Lifetime
Application number
EP95104929A
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German (de)
English (en)
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EP0664660A2 (fr
EP0664660A3 (fr
Inventor
Kiyofumi C/O Sony Corporation Inanaga
Hiroyuki C/O Sony Corporation Sogawa
Yasuhiro C/O Sony Corporation Iida
Susumu C/O Sony Corporation Yabe
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Sony Corp
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Sony Corp
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Publication date
Priority claimed from JP2008514A external-priority patent/JP2751512B2/ja
Priority claimed from JP2008520A external-priority patent/JP2893780B2/ja
Application filed by Sony Corp filed Critical Sony Corp
Publication of EP0664660A2 publication Critical patent/EP0664660A2/fr
Publication of EP0664660A3 publication Critical patent/EP0664660A3/xx
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Publication of EP0664660B1 publication Critical patent/EP0664660B1/fr
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04S—STEREOPHONIC SYSTEMS 
    • H04S1/00—Two-channel systems
    • H04S1/002—Non-adaptive circuits, e.g. manually adjustable or static, for enhancing the sound image or the spatial distribution
    • H04S1/005—For headphones
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R5/00—Stereophonic arrangements
    • H04R5/033—Headphones for stereophonic communication

Definitions

  • the present invention relates to an audio signal binaural reproducing apparatus for reproducing audio signals by means of headphones.
  • a binaural reproducing method has heretofore been known as an approach for providing better direction sensation of sound image or outside head localization sensation when audio signals are reproduced by headphones fitted to the head of a listener so that a pair of headphones are located in the vicinity of both ears.
  • the direction sensation of sound image and outside head localization sensation and the like depend upon the differences in volumes, times and phases of sounds listened by left and right ears.
  • the signal processing aims at causing in an audio output reproduced by the headphones, audio effects equivalent to those caused by the difference in distances between sound sources, that is, speaker systems and right and left ears of a listener and reflections and diffractions in the vicinity of the head of the listener when audio reproducing is performed, for example, by speaker systems remote from the listener.
  • Such a signal processing is performed by convolution-integrating left and right ear audio signals with impulse responses corresponding to the above-mentioned audio effects.
  • the relative direction and position of the sound image that the listener senses are changed.
  • the headphones is turned together with the listeners head if the listener turns his or her head when audio reproducing is performed by a binaural method using headphones, the relative direction and position of the sound image which the listener senses are not changed.
  • an audio signal reproducing system which detects a change in the direction of the listener's head and changes the modes of the signal processing based upon a result of the detection for providing a good front localization sensation in headphones has heretofore been proposed as is disclosed in Japanese Unexamined Patent Publication No. Sho 42-227 and Japanese Examined Patent Publication No. 54-19242.
  • a direction detecting device such as gyrocompass and magnetic needle is provided on the head of the listener.
  • a level adjusting circuit and a delay circuit and the like for processing the audio signals are controlled based upon a result of detection from the direction detecting device so that a sound image sensation which is similar to that of the audio reproducing using speaker systems remote from the listener is obtained.
  • the impulse responses that is, transfer characteristics corresponding to audio effects given to audio signals of left and right ears for each predetermined rotational angle and to store a great amount of information on the transfer characteristics.
  • the information is read from the storing means depending upon the change in direction of the head.
  • the audio signal will be subjected to a necessary convolution-integration processing in real-time.
  • JP-A-1-121,000 discloses an audio signal reproducing apparatus according to the preamble of claim 1. A similar arrangement is disclosed in JP-A-58-116,900.
  • an audio signal reproducing apparatus comprising:
  • An audio signal reproducing apparatus described for reference comprises a headphone set 10 which is fitted over the head M of a listener P and a pair of headphones 2L and 2R are supported by a head band 1 so that they are located In the vicinity of left and right ears of the listener P, respectively as shown in Fig. 1.
  • This apparatus is not prior art to the present invention but is the subject of EPA 919027383 (Patent No. 0,464,217) from which this application was divided.
  • Two sliders 4L and 4R from which support arms 3L and 3R, respectively project are slidably mounted on the head band 1 of the headphone set 10.
  • a pair of signal detectors 5L and 5R which detect a position detection reference signal emitted from a reference signal source 11 are provided at the tip ends of the support arms 3L and 3R, respectively. That is, the pair of signal detectors 5L and 5R are provided on the tip ends of the support arms 3L and 3R projectedly formed on the sliders 4L and 4R which are slidably mounted on the head band 1 so that they are supported in positions remote from the head band 1 and the pair of headphones 2L and 2R, that is the main body of the headphone set.
  • the reference signal source 11 comprises an ultrasonic signal source 12 and an ultrasonic speaker 13 for generating an ultrasonic signal from the ultrasonic signal source 12 as a reference signal.
  • Each of the pair of signal detectors 5L and 5R which receive the reference signal comprises an ultrasonic microphone.
  • An ultrasonic wave generated from the ultrasonic speaker 13, that is, the position detection reference signal is a burst wave in which an ultrasonic wave having a given level is intermittently generated for a given period of time as shown at A in Fig. 2, or an ultrasonic wave, the phase of which may be detected like a so-called level modulated wave, the level of which changes in a given circle.
  • the pair of signal detectors 5L and 5R provided on the headphone set 10 detects the ultrasonic position detection reference signal generated from the ultrasonic speaker 13 and generate respective detection signals shown at B and C in Fig. 2, each having a time lag depending upon the relative positional relation between the listener P and the ultrasonic speaker 13.
  • the pair of signal detectors 5L and 5R are supported by the support arm 3L and 3R in positions remote from the main body of the headphone set 10 while they are mounted on the tip ends of the support arms 3L and 3R in positions remote from the main body of the headphone set 10 while they are mounted on the tip ends of the support arms 3L and 3R which project from the sliders 4L and 4R, respectively slidably mounted on the head band 1 and, the head band 1 and the pair of headphone 2L and 2R, that is, the main body of the headphone set is fitted on the head M of the listener P, they can detect the ultrasonic wave generated from the ultrasonic speaker 13, that is, the position detection reference signal stably and accurately without being located behind the head P of the listener P even if the listener P moves or rotates his head P.
  • the pair of the signal detectors 5L and 5R can be adjusted to a position optical for detecting the detection reference signal by sliding the sliders 4L and 4R along the head band 1.
  • the optimal positions of the headphones 2L and 2R which are fitted on the head M of the listener P by the head band 1 so that they correspond to the vicinity of the left and right ears depend on the shape and size of the had M of the listener P, that is, have the differences among individuals. Accordingly, the positions of the pair of signal detectors 5L and 5R can be adjusted so that they correspond to the headphones 2L and 2R, respectively.
  • Each detection signal obtained by these signal detectors 5L and 5R is applied to an operation unit 14.
  • the operation unit 14 comprises first and second edge detecting circuits 15 and 16, to which the detection signal from the signal detectors 5L and 5R for detecting the position detection reference signal are supplied, respectively and a third edge detecting circuit 17 to which an ultrasonic signal from the ultrasonic signal sources 12, that is, the position detection reference signal is applied.
  • the distance calculating circuit 18 detects the time difference t 1 between pulse signals obtained by the third and first edge detecting circuits 17 and 15 which is represented as ⁇ T 1 in Fig. 2 and the time difference t 2 between pulse signals obtained by the third and second edge detecting circuits 17 and 16 which is represented as ⁇ T 2 in Fig. 2 and then calculates the distance l 0 between the ultrasonic speaker 13 and the center of the head M of the listener P represented as l 0 in Fig. 3 based upon the time differences t 1 , t 2 and the sound velocity V.
  • the sound velocity V may be preliminarily preset as a constant in the distance calculating circuit 18 or alternatively may be changed with changes in atmospheric temperature, humidity and atmospheric pressure and the like.
  • compensation may be conducted for the positional relation between the signal detector 5L and 5R and the center of the head M, the shape and size of the hand M.
  • Signals representative of the distance l 0 , time differences t 1 and t 2 are fed to an angle calculating circuit 20.
  • the circuit 19 for detecting the time difference between both ears detects the time difference t 3 between the pulse signals generated by the first and second edge detecting circuits 15 and 16, represented as ⁇ 3 in Fig. 2.
  • a signal representative of the time difference t 3 is fed to the angle calculating circuit 20.
  • the angle calculating circuit 20 calculates an angle representative of the direction of the head M represented by an arrow ⁇ 0 in Fig. 3 by using the time differences t 1 , t 2 , t 3 , the distance l 0 , the sound velocity V and the radius r of the head M.
  • the operation unit 14 includes a storing circuit 22 in which information on transfer characteristics from the virtual sound source to both ears of the listener in first quadrant of the rotational angular position of the head of the listener, for example, information on the transfer characteristics for each angle ⁇ 11 to ⁇ 1n in the first quadrant.
  • the control circuit 21 Based upon the current angle position calculated by the angle calculating circuit 20, the control circuit 21 reads the information on the transfer characteristics corresponding to the current angles ⁇ 11 to ⁇ 1n positions from the storing circuit 22 if the current angle position is in the first quadrant in Fig. 4 and reads the transfer characteristics information in which the current angles ⁇ 21 to ⁇ 2n corresponds to the angles ⁇ 11 to ⁇ 1n in the first quadrant from the storing circuit 22 if the current angle position is in the second quadrant in Fig. 4 and read the transfer characteristics information in which the current angles ⁇ 31 to ⁇ 3n corresponds to the angles ⁇ 11 to ⁇ 1n in the first quadrant from the storing circuit 22 if the current angle position is in the third quadrant in Fig.
  • two transfer characteristics in the vicinity of the rotational angular position of the head represented by the angular position information may be read form the storing circuit 22 and the information on the transfer characteristics in the current head rotational angular position may be operated by, for example, linear interpolation processing, as described later with reference to Fig. 6.
  • the audio signal source 24 is an apparatus for outputting given left and right channel audio signals S L and S R , such as recording disc playback apparatus or radio communication receivers and the like.
  • the audio signal processing circuit 23 performs a signal processing which provides the left and right channel audio signals S L and S R fed from the audio signal source 24 with a given transfer characteristics form the virtual sound source to the both ears of the listener.
  • the audio signal processing circuit 23 comprises first to sixth switches 25L, 25R, 26L, 26R, 27L and, 27R for switching the signal lines and first to fourth signal processing units 28a, 28b, 28c and 28d.
  • the first to sixth switches 25L, 25R, 26L, 26R, 27L and 27R are controlled for switching in response to a control signal from the control circuit 21 representative of the quadrant to which the current angular position belongs.
  • the third and fourth switches 26 L and 26 R perform switching of filters for the left and right channel audio signals E L and E R outputted from the audio signal processing circuit 23 and output the left and right audio signals E L and E R unswitched when the current angular position is in the second or fourth quadrant and output the audio signals E L and E R from which high frequency components have been removed by low pass filters 30L and 30R when the current angular position is in the second or fourth quadrant.
  • an impulse response representative of the transfer characteristics of the left and right channel audio signals S L and S R reproduced from a pair of left and right channel speakers which are virtual sound sources facing to a listener to each ear of the listener is preset based upon information on transfer characteristics supplied from the control circuit 21.
  • the first signal processing unit 28a presets the impulse response ⁇ h RR (t, ⁇ ) ⁇ representative of transfer characteristics of the sound reproduced from the right channel audio signal S R to the right ear.
  • the second signal processing unit 28b presets the impulse response ⁇ h RL (t, ⁇ ) ⁇ representative of the transfer characteristics of the sound reproduced from the right channel audio signal S R to the left ear.
  • the third signal processing unit 28c presets the impulse response ⁇ h LR (t, ⁇ ) ⁇ representative of transfer characteristics of the sound reproduced form the left channel audio signal S L to the right ear.
  • the fourth signal processing unit 28d presents the impulse response ⁇ h LL (t, ⁇ ) ⁇ representative of the transfer characteristics of the sound reproduced from the left channel audio signal S L to the left ear.
  • the right channel audio signal S R is fed the first and second signal processing units 28a and 28b.
  • the first signal processing unit 28a the right channel audio signal S R is subjected to a signal processing of convolution-integration of the impulse response ⁇ h RR (t, ⁇ ) ⁇ .
  • the second signal processing unit 28b the right channel audio signal S R is subjected to a signal processing of convolution-integration of the impulse response ⁇ h RL (t, ⁇ ) ⁇ .
  • the left channel audio signal S L is fed to the third and fourth signal processing units 28c and 28d.
  • the third signal processing unit 28c the left channel audio signal S L is subjected to a signal processing of convolution-integration of the impulse response ⁇ h LR (t, ⁇ ) ⁇ .
  • the second signal processing unit 28d the left channel audio signal S L is subjected to a signal processing of convolution-integration of the impulse response ⁇ h LL (t, ⁇ ) ⁇ .
  • the output signals from the first and third signal processing units 28a and 28c are applied to the right channel adder 29R and are added with each other therein.
  • the output signal of the right channel adder 28R is fed as the right channel studio signal E R via the right channel amplifier 31R to the right channel headphone 2R and reproduced as a sound.
  • the output signals from the second and fourth signal processing units 28b and 28d are applied to the left channel adder 29L and are added with each other therein.
  • the output signal of the left channel adder 29 is fed as the left channel audio signal E L via the left channel amplifier 31L to the left channel headphone 2L and reproduced as a sound.
  • Fig. 5B shows that the listener P has approached to a pair of speaker systems S L and S R , that is, virtual sound sources from a position of Fig. 5A.
  • Fig. 4C shows that the listener P rotates his head M towards the right speaker device S R .
  • the audio signal reproducing apparatus of the present invention shown in Fig. 6 comprises a headphone set 40 which is fitted over the head M of a listener P and a pair of headphones 42L and 42R are supported by a head band 41 so that they are located in the vicinity of the left and right ears of the listener P, as is similar to the apparatus shown in Fig. 1.
  • Two sliders 44L and 44R from which support arms 43L and 43R, respectively project are slidably mounted on the head 1 of the headphone set 40.
  • a pair of signal detectors 45L and 45R which detect a position detection reference signal emitted from a reference signal source 51 are provided at the tip ends of the support arms 43L and 43R, respectively. That is, the pair of signal detectors 45L and 45R are provided on the tip ends of the support arms 43L and 43R projectedly formed on the sliders 44L and 44R which are slidably mounted on the head band 51 so that they are supported in positions remote from the head band 51 and the pair of headphones 42L and 42R, that is the main body of the headphone set.
  • the reference signal source 51 comprises an ultrasonic signal source 52 and an ultrasonic speaker 53 for generating an ultrasonic signal from the ultrasonic signal source 52 as a reference signal.
  • Each of the pair of signal detectors 45L and 45R which receives the reference signal comprises an ultrasonic microphone.
  • An ultrasonic wave generated from the ultrasonic speaker 53 that is, the position detection reference signal is a burst wave in which an ultrasonic wave having a given level is intermittently generated for a given period of time as is similar to the first embodiment, or an ultrasonic wave, the phase of which may be detected like a so-called level modulated wave, the level of which changes in a given circle.
  • the pair of signal detectors 45L and 45R provided on the headphone set 40 detects the ultrasonic position detection reference signal generated from the ultrasonic speaker 53 and generate respective detection signals, each having a time lag depending upon the relative positional relation between the listener P and the ultrasonic speaker 53.
  • Each detection signal obtained by these signal detectors 45L and 45R is applied to an operation unit 54.
  • the operation unit 54 comprises first and second edge detecting circuit 55 and 56, to which the detection signal from the signal detectors 45L and 45R for detecting the position detection reference signal are supplied, respectively and a third edge detecting circuit 57 to which an ultrasonic signal from the ultrasonic signal source 52, that is, the position detection reference signal is applied.
  • the first and second edge detecting circuits 55 and 56 detect rise-up edges of the detection signals generated from the signal detectors 45L and 45R, respectively and output pulse signals corresponding to the rise-up edges pulse signals generated by the first and second edge detecting circuits 55 and 56 are supplied to a distance calculating circuit 58 and a circuit 59 for detecting the time difference between both ears.
  • the third edge detecting circuit 57 detects the rise-up edge of the ultrasonic signal from the ultrasonic signal source 52 and outputs a pulse signal corresponding to the rise-up edge.
  • a pulse signal obtained by the third edge detection circuit 57 is supplied to the distance calculating circuit 58.
  • Signals representative of the distance l 0 , time differences t 1 and t 2 are fed to an angle calculating circuit 60.
  • the circuit 59 for detecting the time difference between both ears detects the time difference t 3 between the pulse signals generated by the first and second edge detecting circuits 55 and 56. A signal representative of the time difference t 3 is fed to the angle calculating circuit 60.
  • the angle calculating circuit 60 calculates an angle ⁇ 0 representative of the direction of the head M by using the time differences t 1 , t 2 , t 3 , the distance l 0 , the sound velocity V and the radius r of the head M similarly to the angle calculating circuit 20 in the first embodiment.
  • the operation unit 54 includes a storing circuit 62 in which transfer characteristics information representative of the transfer characteristics from the virtual sound sources to both ears of the listener for each predetermined angle, which is larger than that of the angular positional information of the listener calculated by the angle calculating circuit 60.
  • the interpolation operation and processing circuit 61 reads the information on two transfer characteristics in the vicinity of the rotational angular position of the head represented the current angular positional information calculated by the angle calculating circuit 60 and operates the transfer characteristics in the current rotational angular position of the head by, for example, a linear interpolation processing.
  • the information on the transfer characteristics in the current rotational angular position obtained by the interpolation operation and processing circuit 61 is supplied to an audio signal processing circuit 63.
  • the audio signal processing circuit 63 is also supplied with left and right channel audio signals S L and S R outputted from an audio signal source 64.
  • the output signals from the first and third signal processing units 65a and 65c are applied to the right channel adder 66R and are added with each other therein.
  • the output signal of the right channel adder 66R is fed as the right channel audio signal E R via the right channel amplifier 68R to the right channel headphone 4R of the headphones 40 and reproduced as a sound.
  • the output signals from the second and fourth signal processing units 64b and 64a are applied to the left channel adder 66L and are added with each other therein.
  • the output signal of the right channel adder 66L is fed as the left channel audio signal E R via the left channel amplifier 68L to the left channel headphone 42L of the headphone set 40 and reproduced as a sound.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Stereophonic System (AREA)
  • Stereophonic Arrangements (AREA)

Claims (5)

  1. Appareil de reproduction de signal audio comprenant :
    un moyen (62) pour stocker une information de caractéristique de transfert représentative de la caractéristique de transfert provenant de sources sonores virtuelles pour les deux oreilles d'un auditeur pour chacun d'une pluralité d'angles de rotation prédéterminés correspondant au déplacement de la tête de l'auditeur ;
    un moyen (45L, 45R, 51, 55-59) pour détecter la position angulaire en rotation correspondant au déplacement de la tête de l'auditeur ; et
    un moyen de traitement de signal audio (63) pour traiter des signaux audio de canaux gauche et droit à l'aide d'une information de caractéristique de transfert calculée et ainsi, les signaux audio qui ont été traités par ledit moyen de traitement de signal audio peuvent être reproduits en tant que sons par un jeu d'écouteurs (40),
    caractérisé par :
    un moyen d'opération d'interpolation (61) pour lire à partir dudit moyen de stockage une information concernant au moins deux caractéristiques de transfert pour des angles au voisinage de la position angulaire en rotation de la tête représentée par une sortie de détection dudit moyen de détection et pour traiter par interpolation l'information de caractéristique de transfert lue pour la position angulaire en rotation de la tête représentée par la sortie de détection dudit moyen de détection afin de dériver ladite information de caractéristique de transfert calculée.
  2. Appareil selon la revendication 1, dans lequel ledit moyen de détection inclut :
    une paire d'éléments de détection de signal (45L, R) pour détecter un signal de référence émis depuis une source de signal de référence (53) ;
    un moyen (58) pour calculer la distance entre ladite source de signal de référence et la tête de l'auditeur à partir de la différence de phase entre les signaux de sortie de détection provenant de ladite paire des éléments de détection de signal et dudit signal de référence ; et
    un moyen (59) pour détecter la différence temporelle entre les signaux de sortie de détection provenant de ladite paire d'éléments de détection de signal et ainsi, la position angulaire en rotation de la tête de l'auditeur est calculée en utilisant une information concernant la distance obtenue à partir dudit moyen de calcul de distance et concernant la différence temporelle obtenue à partir dudit moyen de détection de différence temporelle.
  3. Appareil selon la revendication 1 ou 2, dans lequel ledit moyen de traitement de signal audio inclut :
    un premier processeur de signal (65a) pour appliquer sur le signal audio d'entrée de canal droit (SR) une convolution-intégration de la réponse impulsionnelle correspondant à une caractéristique de transfert d'un signal audio reproduit de canal droit d'un signal audio d'entrée appliqué sur l'oreille droite ;
    un second processeur de signal (65b) pour appliquer sur le signal audio d'entrée de canal droit (SR) une convolution-intégration de la réponse impulsionnelle correspondant à la caractéristique de transfert du signal audio reproduit de canal droit appliqué sur l'oreille gauche ;
    un troisième processeur de signal (65c) pour appliquer sur le signal audio d'entrée de canal gauche (SL) une convolution-intégration de la réponse impulsionnelle correspondant à la caractéristique de transfert du signal audio reproduit de canal gauche du signal audio d'entrée appliqué sur l'oreille droite ;
    un quatrième processeur de signal (65d) pour appliquer sur le signal audio d'entrée de canal gauche (SL) une convolution-intégration de la réponse impulsionnelle correspondant à la caractéristique de transfert du signal audio reproduit de canal gauche appliqué sur l'oreille gauche ;
    un premier moyen (66R) pour additionner la sortie de ladite première unité de traitement de signal à la sortie de la troisième unité de traitement de signal ;
    un second moyen (66L) pour additionner la sortie de ladite seconde unité de traitement de signal à la sortie de la quatrième unité de traitement de signal et ainsi, les sorties (ER, EL) des premier et second moyens d'addition sont respectivement appliquées sur les écouteurs de canaux droit et gauche dudit jeu d'écouteurs.
  4. Appareil selon la revendication 1, 2 ou 3, dans lequel ledit moyen d'opération d'interpolation (61) est adapté pour lire à partir dudit moyen de stockage (62) l'information concernant deux caractéristiques de transfert pour des angles au voisinage de la position angulaire en rotation de la tête représentée par la sortie de détection en provenance dudit moyen de détection et pour effectuer une opération d'interpolation linéaire afin de dériver l'information de caractéristique de transfert calculée.
  5. Appareil selon la revendication 1, 2 ou 3, dans lequel ledit moyen d'opération d'interpolation (61) est adapté pour lire à partir dudit moyen de stockage (62) l'information concernant plus de deux caractéristiques de transfert pour des angles au voisinage de la position angulaire en rotation de la tête représentée par la sortie de détection en provenance dudit moyen de détection et pour effectuer une opération d'interpolation secondaire afin de dériver l'information de caractéristique de transfert calculée.
EP95104929A 1990-01-19 1991-01-18 Appareil de reproduction de signaux audio Expired - Lifetime EP0664660B1 (fr)

Applications Claiming Priority (7)

Application Number Priority Date Filing Date Title
JP2008514A JP2751512B2 (ja) 1990-01-19 1990-01-19 音響信号再生装置
JP851490 1990-01-19
JP2008520A JP2893780B2 (ja) 1990-01-19 1990-01-19 音響信号再生装置
JP852090 1990-01-19
JP8520/90 1990-01-19
JP8514/90 1990-01-19
EP91902738A EP0464217B1 (fr) 1990-01-19 1991-01-18 Appareil de reproduction de signaux acoustiques

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EP91902738A Division EP0464217B1 (fr) 1990-01-19 1991-01-18 Appareil de reproduction de signaux acoustiques
EP91902738.3 Division 1991-01-18

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EP0664660A2 EP0664660A2 (fr) 1995-07-26
EP0664660A3 EP0664660A3 (fr) 1995-08-09
EP0664660B1 true EP0664660B1 (fr) 2000-09-27

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EP91902738A Expired - Lifetime EP0464217B1 (fr) 1990-01-19 1991-01-18 Appareil de reproduction de signaux acoustiques

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EP (2) EP0664660B1 (fr)
KR (1) KR920702175A (fr)
CA (1) CA2048686C (fr)
DE (2) DE69120150T2 (fr)
WO (1) WO1991011080A1 (fr)

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JPS58116900A (ja) * 1982-11-15 1983-07-12 Sony Corp ステレオ再生装置
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JP2671329B2 (ja) * 1987-11-05 1997-10-29 ソニー株式会社 オーディオ再生装置
JP3155592B2 (ja) * 1991-12-11 2001-04-09 武藤工業株式会社 累進寸法修正方法および装置

Also Published As

Publication number Publication date
DE69132430T2 (de) 2001-04-05
DE69132430D1 (de) 2000-11-02
EP0464217A4 (en) 1992-06-24
CA2048686C (fr) 2001-01-02
WO1991011080A1 (fr) 1991-07-25
EP0464217A1 (fr) 1992-01-08
DE69120150T2 (de) 1996-12-12
KR920702175A (ko) 1992-08-12
CA2048686A1 (fr) 1991-07-20
EP0664660A2 (fr) 1995-07-26
EP0464217B1 (fr) 1996-06-12
EP0664660A3 (fr) 1995-08-09
DE69120150D1 (de) 1996-07-18

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