WO1991011080A1 - Appareil de reproduction de signaux acoustiques - Google Patents

Appareil de reproduction de signaux acoustiques Download PDF

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Publication number
WO1991011080A1
WO1991011080A1 PCT/JP1991/000057 JP9100057W WO9111080A1 WO 1991011080 A1 WO1991011080 A1 WO 1991011080A1 JP 9100057 W JP9100057 W JP 9100057W WO 9111080 A1 WO9111080 A1 WO 9111080A1
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WO
WIPO (PCT)
Prior art keywords
signal
output
signal processing
transfer characteristic
audio signal
Prior art date
Application number
PCT/JP1991/000057
Other languages
English (en)
Japanese (ja)
Inventor
Kiyofumi Inanaga
Hiroyuki Sogawa
Yasuhiro Iida
Susumu Yabe
Original Assignee
Sony Corporation
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
Priority claimed from JP2008514A external-priority patent/JP2751512B2/ja
Priority claimed from JP2008520A external-priority patent/JP2893780B2/ja
Application filed by Sony Corporation filed Critical Sony Corporation
Priority to EP91902738A priority Critical patent/EP0464217B1/fr
Priority to KR1019910701121A priority patent/KR920702175A/ko
Priority to DE69120150T priority patent/DE69120150T2/de
Priority to CA002048686A priority patent/CA2048686C/fr
Publication of WO1991011080A1 publication Critical patent/WO1991011080A1/fr

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Classifications

    • 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 reproducing device for performing binaural reproduction of an audio signal using a headphone device.
  • Background technology Conventionally, as in a headphone device that reproduces an acoustic signal using a headphone unit, a pair of heads that are supported near the auricles by being attached to the listener's head when worn on the listener's head
  • a binaural method is known as a method for improving the sense of direction of a sound image, the sense of out-of-head localization, and the like when reproducing an audio signal using a headphone unit.
  • a sound reproduction system employing this binaural method uses a predetermined signal in advance for a sound signal reproduced by a headphone device. Processing o
  • the sense of direction of the sound image, the sense of out-of-head localization, and the like are determined by the volume difference, time difference, phase difference, and the like of the sounds heard by the left ear and the right ear.
  • the above-mentioned signal processing means for example, that when sound is reproduced by a speech device arranged apart from the listener, the distance from the sound source, ie, the speech device, to the left and right ears of the listener and the head of the listener are different.
  • the acoustic effect produced by reflection and diffraction in the vicinity and the equivalent acoustic effect This is the signal processing that occurs in the more reproduced audio output.
  • Such signal processing is performed by, for example, a process of convoluting and integrating an impulse response corresponding to the above-described acoustic effect into acoustic signals for the left ear and the right ear.
  • the absolute position of the sound image does not change even if the listener moves or rotates the head.
  • the relative direction and position of the sound image perceived by the user changes.
  • the headphone device when sound reproduction is performed by the binaural method using a headphone device, when the listener rotates the head, the headphone device is also rotated together with the head. The relative direction and position of the sound image felt by the listener do not change.
  • a change in the direction of the listener's head is detected, and this detection is performed.
  • an audio signal reproduction system has been proposed in which a headphone device can obtain a good sense of forward localization.
  • a direction detecting device such as a so-called jay mouth compass or a magnetic needle is provided on the listener's head.
  • the speaker device arranged to be separated from the listener so as to control the level adjustment circuit, the delay circuit, and the like for processing the audio signal. It is intended to obtain a sound field feeling similar to that of sound reproduction by a computer.
  • the impulse response corresponding to the acoustic effect given to the acoustic signals for the left and right ears The transfer characteristics are measured in advance for each predetermined angle, and the transfer characteristic information of the enormous amount of information is stored in the storage means. Processing must be performed on the audio signal in real time.
  • the present invention has been made in view of the above-described conventional situation, and has been made in consideration of the above-described conventional situation.
  • the amount of information of transfer characteristic information from a virtual sound source to a listener's ear, which is necessary for performing binaural reproduction of an audio signal using a headphone device With a simple configuration using storage means with a small storage capacity, the headphone device does not move the virtual sound source position even when the listener moves, providing an extremely natural sound image localization feeling. It is an object of the present invention to provide an acoustic signal reproducing apparatus capable of performing the obtained binaural reproduction. Disclosure of the invention
  • the sound signal reproducing apparatus includes: a detecting unit configured to detect a rotation angle position corresponding to a movement of a listener's head with respect to a virtual sound source; and at least one quadrant of the rotation angle position on the listener's head.
  • a detecting unit configured to detect a rotation angle position corresponding to a movement of a listener's head with respect to a virtual sound source; and at least one quadrant of the rotation angle position on the listener's head.
  • the transfer characteristic information indicating the transfer characteristic from the virtual sound source to the listener's both ears is stored.
  • the acoustic signal reproducing device stores transfer characteristic information indicating a transfer characteristic from a virtual sound source to the listener's both ears for each predetermined rotation angle according to the rotation of the listener's head.
  • Storage means a detection means for detecting a rotation angle position corresponding to the movement of the listener's head with a resolution higher than the predetermined rotation angle, and a rotation angle position near the rotation angle position indicated by the detection output of the detection means.
  • FIG. 1 is a block diagram schematically showing a configuration of an audio signal reproducing device according to the present invention.
  • FIG. 2 is a time chart schematically showing a state of a signal supplied to an arithmetic unit of the audio signal reproducing apparatus.
  • FIG. 3 is a schematic diagram showing distances and angles calculated by the arithmetic unit of the audio signal reproducing device.
  • FIG. 4 is a diagram provided for explanation of transfer characteristic information stored in a storage circuit of an arithmetic unit in the audio signal reproducing device.
  • FIG. 5 is a plan view showing a relative positional relationship between a virtual sound source and a listener for explaining an operation of binaural reproduction by the above-described sound signal reproducing apparatus.
  • FIG. 6 is a block diagram schematically showing another configuration of the audio signal reproducing device according to the present invention.
  • BEST MODE FOR CARRYING OUT THE INVENTION A sound signal reproducing apparatus according to the present invention is mounted on a listener's head (M) by a headband (1) as in the first embodiment shown in FIG. And a headphone device (10) adapted to support a pair of headphone units (2, 2R) corresponding to the vicinity of the left and right auricles of the listener.
  • the headband (1) of the headphone device (10) two sliders (4L) and (4R) having support arms (3D, (3R)) protrudingly formed are slidably mounted.
  • the pair of signal detectors (5L) and (5R) that sense the position detection reference signal sent from the reference signal source (11) are connected to the tip of the support arm (3, (3R)). That is, the pair of signal detectors (5 and (5R)) protrude from the sliders (4L) and (4R) slidably mounted on the headband (1).
  • the headband (1) and the pair of headphone units (2L) and (2), ie, the headphone body are separated from each other by being provided at the tip of the support arms (3L) and (3R). Above the support arm (Supported by (3D, (3R)).
  • the reference signal source (11) is composed of an ultrasonic signal source (12) and an ultrasonic speaker (13) for transmitting an ultrasonic signal from the ultrasonic signal source (12) as a reference signal. It is configured.
  • An ultrasonic microphone is used for each of the pair of signal detectors (5L) and (5R) that sense the reference signal.
  • the ultrasonic wave transmitted from the ultrasonic wave force (13), that is, the reference signal for position detection is such that a predetermined level of ultrasonic wave intermittently occurs at predetermined time intervals.
  • An ultrasonic wave whose phase can be detected such as a burst wave transmitted to a computer or a so-called level-modulated wave whose level fluctuates in a predetermined period.
  • the pair of signal detectors (5L) and (5R) provided in the headphone device (10) are used as reference signals for position detection using ultrasonic waves transmitted from the ultrasonic force (13). Then, each detection signal as shown in B and C of FIG. 2 having a time delay corresponding to the relative positional relationship between the listener and the ultrasonic speed (13) is output.
  • the pair of signal detectors (5L) and (510 are the support arms (3L) and (3L) that protrude from the sliders (4L) and (4R) slidably mounted on the headband (1).
  • 3R), the headband (1) and a pair of headphone units (2L), (2R), that is, the headphone body is mounted on the listener's head. It is supported by the support arms (3L) and (3R) at a position away from the main body, so even if the listener moves or turns his / her head, it will be hidden behind the listener's head. Without this, the ultrasonic wave transmitted from the ultrasonic speed (13) can be sensed extremely well, and the reference signal for position detection can be detected stably and accurately.
  • the pair of signal detectors (5L) and (5R) slide the sliders () and (4R) along the headband (1) to detect the reference signal for position detection. It can be adjusted to the optimal position.
  • the headphone unit (2L) which is attached to the listener's head (M) by the headband (1) and supported in the vicinity of the left and right auricles of the listener
  • the position of 2R) depends on the shape and size of the listener's head (M), and there are individual differences, so the pair of headphone units (2L) and (2R) correspond to the positions of the headphone unit (2R). Adjust the positions of the signal detectors (5) and (5R).
  • Each detection signal obtained by these signal detectors (5L) and (5R) is supplied to an operation i o device (14).
  • the arithmetic unit (14) is provided with first and second edge detection circuits (15) to which respective detection signals of the reference signal for position detection are supplied by the signal detectors (5L) and (5R). ), (16) and a third edge detection circuit (17) to which the ultrasonic signal from the ultrasonic signal source (12), that is, the reference signal for position detection is supplied.
  • the first and second edge detection circuits (15) and (16) detect each rising edge of each detection signal by each of the signal detectors (5L) and (5R) and correspond to the rising edge.
  • Each pulse signal as shown in D and E in Fig. 2 is output.
  • Each pulse signal obtained from the first and second edge detection circuits (15) and (16) is supplied to a distance calculation circuit (18) and a binaural time difference detection circuit (19).
  • the third edge detection circuit (17) detects a rising edge of the ultrasonic signal from the ultrasonic signal source (12), and detects the rising edge of the ultrasonic signal from F in FIG. 2 corresponding to the rising edge.
  • a pulse signal as shown is output.
  • the pulse signal 5 obtained by the third edge detection circuit (17) is supplied to the distance calculation circuit (18).
  • the distance calculation circuit (18) is composed of the pulse signal obtained by the third edge detection circuit (17) indicated by ⁇ , in FIG. 2 and the pulse signal obtained by the first edge detection circuit (15).
  • the time difference t between corresponding pulses in the signal, and the pulse signal obtained by the third edge detection circuit (17) indicated by ⁇ 2 in FIG. 2 and the pulse signal obtained by the second edge detection circuit (16) It is detecting the time difference t 2 between the corresponding pulses in the pulse signal. Then, based on each of these time differences, t 2 and the sound speed V, an arrow ⁇ in FIG.
  • the sound velocity V may be set in advance in the distance calculation circuit (18) as a constant, or may be changed according to changes in temperature, humidity, air pressure, and the like.
  • the distance ⁇ is calculated based on the positional relationship between the signal detectors (5L) and (5R) and the center of the head ( ⁇ ) and the shape and size of the head ( ⁇ ). Correction may be performed. The above distance ⁇ .
  • the signals indicating the time differences t 1, t 2 are sent to the angle calculation circuit (20).
  • each of the time difference t,, t 2, t 3, said distance ⁇ Using the sound velocity V and the radius r of the head (M), an arrow in FIG. An angle 0 indicating the direction of the head (M). Calculate the angle 0 above. Is, for example, ⁇ o -sin- 1 ⁇ V 2 (t, + t 2 ) t 3/4 r ⁇ ... It can be obtained by the first equation.
  • the angle 0 indicating the relative positional relationship between the reference position and the head (M) of the listener, with the position of the ultrasonic speaker (13) 'as the reference position of the virtual sound source. And distance. From this information, the rotation angle of the head (M) with respect to the desired virtual sound source position and the relative distance from the virtual sound source are calculated.
  • the angular position information of the listener obtained by the angle calculation circuit (20) is supplied to a control circuit (21).
  • the arithmetic unit (14) is configured to include a transfer characteristic indicating a transfer characteristic from a virtual sound source to at least two ears of the listener in at least one quadrant of the rotation angle position of the listener's head. information, for example, as shown in FIG. 4, the predetermined angle 0 in the first quadrant, and a storage circuit (22) for storing transfer characteristics information for each ⁇ 0 I n.
  • the control circuit (21) determines whether the current angular position is in the first quadrant of FIG.
  • the transfer characteristic information corresponding to the current angles 0 ,, to 0 ln positions is read from the storage circuit (22) as it is, and if the current angle position exists in the second quadrant of FIG. 4, From the storage circuit (22), the transfer characteristic information in which the current angles 0 2 ] to 0 2n correspond to the angles 0 H to 0 ln positions of the first quadrant is read out. If it exists in the third quadrant of FIG.
  • the transfer characteristic information corresponding to the current angle S 3 ,..., 0 311 corresponding to the angle ln position of the first quadrant is read from the storage circuit (22). Furthermore, the memory circuit (22) from the current angle of 0 4 when the current angular position are exist in the fourth quadrant of Figure 4 , ⁇ 0 "corresponding to the angle 0 position in the first quadrant. Then, the transfer characteristic information is supplied to the acoustic signal processing circuit (23) together with a signal indicating the quadrant to which the current angular position belongs.
  • the transfer characteristics from the virtual sound source to the listener's both ears can be treated as symmetric in each quadrant.
  • control circuit (21) reads two pieces of transfer characteristic information near the head rotation angle position indicated by the angle position information from the storage circuit (22), and performs, for example, linear interpolation processing on the current transfer characteristic information.
  • the transfer characteristic information at the position of the head rotation angle may be calculated.
  • left Chiya tunnel and right Chiya tunnel acoustic signal Ru is outputted from the acoustic signal supply source (22) S L, is S R are supplied.
  • the acoustic signal supply source (24) is a predetermined left channel and right Chiya tunnel acoustic signals S L, apparatus for outputting SR, for example, various recording disk reproducing apparatus, a recording tape player, or And a radio wave receiving device.
  • the sound signal processing circuit (23) includes, in the left channel and right channel sound signals S i_, SR sent from the sound signal supply source (24), predetermined transfer characteristics from a virtual sound source to both ears of a listener.
  • This is a circuit that performs signal processing to provide the following: 1st to 6th switching switches for switching signal lines (25 switches), (25R), (26L), (26R), (27 switches), (27R switches) ) and first to fourth signal processing section performs a process of providing the transfer characteristic (28a), (28b), (28c), (28d) c of the first to become equipped with such sixth switching sweep rate Tutsi ( The (25L), (25R), (26L), (26R), (27L) and (27R) control the signal from the control circuit (21) indicating the quadrant to which the current angular position belongs.
  • Switching is controlled as a signal.
  • Said first switching Sui Tutsi (25L) and a second switching sweep rate 'Tutsi (2 5R) said left channel acoustic signal transmitted from the audio signal source (24) S L and the right channel acoustic signal S but intends line input switching for r, to the when the current angular position belonging to the first quadrant or the third quadrant, the right channel acoustic signal S R to the first and second signal processing unit ( 28a), (both supplied to 28b), the left channel acoustic signal S L said third and fourth signal processing section (28c), (is supplied to 28d), also the current angular position second When belonging to the quadrant or the fourth quadrant, the left channel sound signal is supplied to the first and second signal processing units (28a) and (28b), and the right channel sound signal S R Is supplied to the third and fourth signal processing units (28c) and (28d).
  • the third switching sweep rate Tutsi (26L) and the fourth switching sweep rate Tutsi (26R) is an acoustic signal E L of the left and right tea N'ne Le output from the audio signal processing circuit (23), the output of the E R A switch for adding the output signals of the first and third signal processing units (28a) and (28c) when the current angular position belongs to the first quadrant or the third quadrant.
  • first adder by selecting the output signal of the (29R) as the acoustic signal E R of the right channel monitor, the second and fourth signal processing section (28b), first adding the output signal of (28d)
  • the output signal of the adder 2 (29L) is selected as the sound signal E of the left channel, and when the current angular position belongs to the second or fourth quadrant, The output signal of the adder (29R) is selected as the sound signal ⁇ ⁇ ⁇ of the left channel, and the second Selects the output signal of the adder (29L) as the acoustic signal E R of the right channel.
  • the third switch (26L) and the fourth switch Lee pitch (26R) is an acoustic signal E L of the left and right tea down channel to be output from the audio signal processing circuit (23), performs Ficoll Le evening switching of ER, the current angular position first quadrant or the in the case belonging to quadrant, to the time the acoustic signal EL to the left and right switch ya tunnel, the E R outputted as it is, the current angular position belongs to the second quadrant or the fourth quadrant, mouth one passphrase Filter (30
  • the signal processing units (28a), (28b), (28c), and (28d) are spaced apart from the listener based on the transfer characteristic information supplied from the control circuit (21).
  • the left and right channel sound signals S: _, are used as a virtual sound source with a pair of installed speed devices for the left and right channels.
  • the first signal processing unit (28a) sets an impulse response ⁇ h RR (t, ⁇ ) ⁇ representing a transfer characteristic of the sound reproduced from the right channel sound signal SH to the right ear.
  • the second signal processing unit (2 8b) sets the right channel acoustic signal S R b to express the transfer characteristic for the left ear of the sound reproduced down pulse response ⁇ h R i_ (t, ⁇ ) ⁇ .
  • Said third signal processing section (28c) sets the I Nparusuresupo Nsu the left channel acoustic signal S representing the transfer characteristic for the acoustic of the right ear reproduced ⁇ h LR ( ⁇ , ⁇ ) ⁇ .
  • the fourth signal processing section (28d) sets the left channel acoustic signal ⁇ and h L (t, ⁇ ) ⁇ fin pulse response representing a transfer characteristic for the acoustic of the left ear reproduced, and, to come to the current angular position of the listener's head belongs to the first quadrant, the right channel acoustic signal S R, the first signal processing unit (28 a) and the second signal processing unit (28b).
  • the first signal processing unit in (28a) subjected the fin pulse response ⁇ h RR (t, ⁇ ) ⁇ a convolutional integration by signal processing in the right channel acoustic signal S R.
  • the left channel acoustic signal S is sent to the third signal processing section (28c) and the fourth signal processing section (28d).
  • the third signal processing unit in (28c) said fin pulse response ⁇ h LR (t, ⁇ ) ⁇ the convolution integration by signal processing 'applied to the left channel acoustic signal S L.
  • the second signal processing unit (28d) performs signal processing on the left channel acoustic signal SL by convolution of the impulse response ⁇ h (t, ⁇ ) ⁇ .
  • the output signals of the first signal processing section (28a) and the third signal processing section (28c) are supplied to the right channel adder (29R) and added to each other.
  • the output signal of the right channel adder (29R) is passed through the right channel amplifier (31R) as a right channel acoustic signal E R to the right channel of the headphone device (10). It is sent to the headphone unit (2R) and played.
  • the output signals of the second signal processing unit (28b) and the fourth signal processing unit (28d) are supplied to a left channel adder (29L) and added to each other.
  • the acoustic signal EL to remove the high frequency components by (30R), by outputting the E R audio signal reproducing apparatus constructed comprising embodiments as c above can be obtained rear localization
  • the rotation angle position corresponding to the listener's head movement calculated by the angle calculation circuit (20) is calculated.
  • the above-described acoustic signal processing circuit (23) performs signal processing to form transfer characteristic information and to respond in real time to changes in transfer characteristics due to listener movement and rotation of the head (M) using the left channel and right channel. Chiya tunnel of the sound signal S L, by performing the SR, e.g. As shown in Fig.
  • A, B, and C show the relative positional relationship between the virtual sound source and the listener, a pair of speech force devices (SL) installed in front of the listener (P) and separated from each other.
  • SL speech force devices
  • FIG. 5 shows a state in which the listener (P) approaches the virtual sound source from a state in which the listener (P) is positioned as shown at A with respect to the pair of speaker devices (S, (SR), that is, the virtual sound source). Is shown in B, and the state in which the listener (P) rotates the head (M) to the right speaker device (SR) is shown in C.
  • S, (SR) the pair of speaker devices
  • C the acoustic signal reproducing device according to the present invention, as described above, by performing signal processing in real time in response to changes in the transfer characteristics associated with the listener's movement and the rotation of the head (M), a good out-of-head localization without moving the virtual sound source is achieved. And a sense of forward localization is obtained, and a bar corresponding to any of the states A, B, and C in FIG. You can perform normal playback.
  • the storage unit stores the transfer characteristic information indicating the transfer characteristic from the virtual sound source to the listener's both ears in at least one quadrant of the rotational angle position of the listener's head. Since the amount of the transfer characteristic information stored in the storage means is small and the storage capacity is small, it can be used for the storage means.
  • the acoustic signal processing means stores the transfer characteristic information in the head rotation angle position indicated by the detection output by the detection means for detecting the rotation angle position corresponding to the movement of the listener's head in the storage means.
  • At least one quadrant is formed based on the transmission characteristic information, and the left and right channel acoustic signals are processed separately, and the processed audio signals are supplied to the headphone device. If the sound source moves, the virtual sound source position does not move, and it is possible to perform appropriate binaural reproduction with a very g-like sound image localization feeling.
  • the sound signal reproducing device shown in FIG. 6 is attached to the head (M) of the listener by a headband (41) and is similar to the first embodiment described above.
  • a headphone device (40) supporting a pair of headphone units (42L) and (42R) corresponding to the vicinity is provided.
  • the headband (41) of the headphone device (40) On the headband (41) of the headphone device (40), two sliders (44L) and (44R) having support arms (43L) and (43R) protrudingly formed are slidably mounted. And a pair of signal detectors (45L) and (5R) that sense the position detection reference signal sent from the reference signal source (51) are attached to the distal ends of the support arms (43L) and (43). Is provided. That is, the pair of signal detections The holders (45L) and (45R) are connected to the support arms (43L) and (43R) formed on the sliders (44L) and (44R) slidably mounted on the headband (41). By providing the headband (41) and a pair of headphone units (42L) and (42R) at the distal end, the support arms (43L) and (43R) are located at positions separated from the headphone body. ).
  • the reference signal source (51) includes an ultrasonic signal source (52) and an ultrasonic speaker (53) for transmitting an ultrasonic signal from the ultrasonic signal source (52) as a reference signal. It is composed of An ultrasonic microphone is used for each of the pair of signal detectors (45L) and (45R) that sense the reference signal.
  • the ultrasonic wave transmitted from the ultrasonic force (53), that is, the reference signal for position detection, is an intermittent ultrasonic wave of a predetermined level at predetermined time intervals, as in the first embodiment.
  • Such an ultrasonic wave that can be detected in phase such as a burst wave transmitted to a user or a so-called level-modulated wave whose level fluctuates at a predetermined period.
  • the pair of signal detectors (45R) and (45R) provided in the headphone device (40) serve as a reference for position detection using ultrasonic waves transmitted from the ultrasonic speaker (53). Upon sensing the signal, each detection signal having a time delay corresponding to the relative positional relationship between the listener and the ultrasonic speed (53) is output.
  • Each detection signal obtained by these signal detectors (45L) and (45R) is supplied to an arithmetic unit (54).
  • the arithmetic unit (54) includes first and second edge detection circuits (55) to which detection signals of the reference signal for position detection are supplied by the signal detectors (45R) and (45R). , (56) and a third edge detection circuit (57) to which the ultrasonic signal from the ultrasonic signal source (52), that is, the reference signal for position detection is supplied. Ethical.
  • the first and second edge detection circuits (55) and (56) detect each rising edge of each detection signal by each of the signal detectors (45L) and (45R), and correspond to the rising edge. Each pulse signal is output. Each pulse signal obtained by the first and second edge detection circuits (55) and (56) is supplied to a distance calculation circuit (58) and a binaural time difference detection circuit (59).
  • the third edge detection circuit (57) detects a rising edge of the ultrasonic signal from the ultrasonic signal source (52) and outputs a pulse signal corresponding to the rising edge. The pulse signal obtained by the third edge detection circuit (57) is supplied to the distance calculation circuit (58).
  • the distance calculation circuit (58) calculates a time difference t, between a pulse signal obtained by the third edge detection circuit (57) and a corresponding pulse in the pulse signal obtained by the first edge detection circuit (55). , it detects a time difference t 2 between the corresponding pulses in the third Etsu di detection pulse signal obtained by the circuit (57) out and the second pulse signal obtained by the edge detection circuit (56). Then, each of these time differences t], based on the t 2 and the sound velocity V, and calculates the distance ⁇ 0 and the center of the head (M) of the ultrasonic speaker (53) and the listener.
  • the above distance ⁇ The signals indicating the time differences t 1, t 2 are sent to the angle calculation circuit (60).
  • each of the time difference t,, t 2, t 3, above Distance Using the sound velocity V and the radius r of the head (M), similarly to the angle calculation circuit (20) in the first embodiment, the head ( Angle 0 indicating the direction of M). Is calculated. The angle indicating the relative positional relationship between the reference position and the listener's head (M), using the position of the ultrasonic speech force (53) as the reference position of the virtual sound source. And distance ⁇ . From this information, the rotation angle ⁇ of the head (M) with respect to the desired virtual sound source position and the relative distance from the virtual sound source ⁇ are calculated.
  • the listening angle position information obtained by the angle calculation circuit (60) is supplied to an interpolation calculation processing circuit (61).
  • the arithmetic unit (54) is configured to detect the listener from the virtual sound source for each predetermined angle that is coarser than the listener's angular position information calculated by the angle calculation circuit (60).
  • a storage circuit (62) for storing transfer characteristic information indicating transfer characteristics to both ears is provided.
  • the interpolation calculation processing circuit (61) performs two interpolation operations near the head rotation angle position indicated by the angle position information.
  • the transfer characteristic information is read from the storage circuit (62), and the transfer characteristic information at the current head rotation angle position is calculated by, for example, a linear interpolation process.
  • the interpolation calculation processing circuit (61) stores, for example, three or more pieces of transfer characteristic information near the current head rotation angle position indicated by the angle position information in the storage circuit (62). , And may perform the secondary interpolation processing.
  • the transfer characteristic information at the current head rotation angle position obtained by the interpolation arithmetic processing circuit (61) is supplied to the acoustic signal processing circuit (63).
  • left channel and right channel acoustic signal Ru is outputted from the acoustic signal supply source (64) S L, SR are supplied.
  • the acoustic signal supply source (64) is a predetermined left channel and right Chiya tunnel acoustic signals S L, apparatus for outputting SR, for example, various recording disk reproducing apparatus, a recording tape player, or And a radio wave receiving device.
  • the left channel and the right channel are set apart from the listener. left channel and right channel sound-signal as the virtual sound source to spin one force device of one pair for tunnel, fin pulse response is set to represent the transmission characteristics for each ear ⁇ Tosha when reproducing the S R You.
  • the first signal processing unit (65a) sets the right channel acoustic signal SR representing the transmission characteristic for the acoustic of the right ear reproduced impulse response ⁇ h RR (t, ⁇ ) ⁇ .
  • the second signal processing unit (6 5b) sets the right channel acoustic signal S R to represent the transfer characteristics for the left ear of the sound reproduced Lee down pulse response ⁇ h RL (t, ⁇ ) ⁇ .
  • the third signal processing unit (65c) is an impulse response unit that expresses a transfer characteristic of the reproduced sound of the left channel acoustic signal to the right ear.
  • the fourth signal processing unit (65d) sets an impulse response ⁇ hi ⁇ (t, 0) ⁇ representing a transfer characteristic of the reproduced sound of the left channel acoustic signal to the left ear.
  • the right channel acoustic signal S R, the first and second signal processing section (65a), are sent to (65b).
  • the first signal processing unit in (65a) the fin pulse response ⁇ h RR (t, ⁇ ) ⁇ convolving by signal processing performed on the right channel acoustic signal S R.
  • the left channel acoustic signal SL is sent to the third and fourth signal processing units (65c) and (65d).
  • the third signal processing unit in (65c), said fin pulse response ⁇ h ⁇ (t, ⁇ ) ⁇ The signal processing by convolutional integration of applying to the left channel acoustic signal S L.
  • the second signal processing unit (65d) performs signal processing by convolution of the impulse response ⁇ h (t, ⁇ ) ⁇ on the left channel acoustic signal Sl_.
  • the output signals of the signal processing units (65a) and (65c) of No. 3 are supplied to the right channel adder (66R) and added to each other.
  • the output signal of the right-channel adder (66R) is passed through a right-channel amplifier (68R) to a right-channel audio signal E R as a right-channel audio signal of the headphone device (40). It is sent to Doununit (42R) for playback.
  • the output signals of the second and fourth signal processing units (64b) and (64d) are supplied to a left channel adder (66L) and added to each other.
  • the output signal of the left-channel adder (66L) passes through the left-channel amplifier (68L) as the left-channel acoustic signal ⁇ _ to the left of the headphone device (40). It is sent to the channel headphone unit (42L) and played.
  • the acoustic signal processing circuit (63) performs signal processing in real time to respond to changes in transfer characteristics due to the movement of the listener and the rotation of the head (M).
  • a virtual sound source does not move as in the case of reproducing a sound signal. That.
  • the detection output by the detection unit that detects the listener's head rotation angle position with a higher resolution than the resolution of the transfer characteristic information stored in the storage unit is used. At least two pieces of transfer characteristic information in the vicinity of the head rotation angle position shown are read out from the storage means, and the transfer characteristic information at the head rotation angle position shown by the detection output is interpolated by the interpolation calculation means. However, the amount of transfer characteristic information stored in the storage means can be reduced.
  • the sound signal processing means processes the left channel and right channel sound signals based on the transfer characteristic information obtained by the interpolation operation means, and supplies the processed sound signals to the headphone device. Therefore, even if the listener moves, it is possible to perform proper binaural reproduction with an extremely natural sound image localization without moving the virtual sound source position.

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

Abstract

Un appareil assure la reproduction binauriculaire de signaux acoustiques au moyen d'un casque à deux écouteurs. L'appareil de reproduction de signaux acoustiques comprend une mémoire qui enregistre des informations sur les caractéristiques de transfert d'une voie qui s'étend entre une source imaginaire de sons et les deux oreilles d'un auditeur dans au moins un quadrant autour de l'auditeur. Les informations sur les caractéristiques de transfert enregistrées dans la mémoire sont utilisées pour former des informations sur les caractéristiques de transfert à la position angulaire de la tête. Les informations ainsi formées sont représentées par les sorties de détecteurs et les signaux acoustiques des canaux droit et gauche sont traités par des processeurs de signaux acoustiques. Dans cet appareil de reproduction de signaux acoustiques, au moins deux informations sur les caractéristiques de transfert à proximité de la position angulaire de la tête de l'auditeur sont lues dans la mémoire et les signaux acoustiques des canaux droit et gauche sont traités par le processeur de signaux acoustiques sur la base des informations sur les caractéristiques de transfert à la position angulaire de la tête, déduite par interpolation par un calculateur d'interpolation. Même lorsque l'auditeur se déplace, l'appareil de reprodution de signaux acoustiques assure une reproduction binauriculaire appropriée sans faire se déplacer la source imaginaire de sons à cause du port du casque à deux écouteurs.
PCT/JP1991/000057 1990-01-19 1991-01-18 Appareil de reproduction de signaux acoustiques WO1991011080A1 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
EP91902738A EP0464217B1 (fr) 1990-01-19 1991-01-18 Appareil de reproduction de signaux acoustiques
KR1019910701121A KR920702175A (ko) 1990-01-19 1991-01-18 음향 신호 재생 장치
DE69120150T DE69120150T2 (de) 1990-01-19 1991-01-18 Gerät zur wiedergabe von tonsignalen
CA002048686A CA2048686C (fr) 1990-01-19 1991-01-18 Appareil de lecture de signaux audio

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JP2/8514 1990-01-19
JP2/8520 1990-01-19
JP2008514A JP2751512B2 (ja) 1990-01-19 1990-01-19 音響信号再生装置
JP2008520A JP2893780B2 (ja) 1990-01-19 1990-01-19 音響信号再生装置

Publications (1)

Publication Number Publication Date
WO1991011080A1 true WO1991011080A1 (fr) 1991-07-25

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP1991/000057 WO1991011080A1 (fr) 1990-01-19 1991-01-18 Appareil de reproduction de signaux acoustiques

Country Status (5)

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

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0795698A (ja) * 1993-09-21 1995-04-07 Sony Corp オーディオ再生装置
EP0744881B1 (fr) * 1995-05-22 2004-07-14 Victor Company Of Japan, Ltd. Appareil de reproduction par casque d'écoute
JP3577798B2 (ja) * 1995-08-31 2004-10-13 ソニー株式会社 ヘッドホン装置
FR2744871B1 (fr) * 1996-02-13 1998-03-06 Sextant Avionique Systeme de spatialisation sonore, et procede de personnalisation pour sa mise en oeuvre
EP2005793A2 (fr) * 2006-04-04 2008-12-24 Aalborg Universitet Procede de technologie binaurale avec suivi de position
EP2288178B1 (fr) * 2009-08-17 2012-06-06 Nxp B.V. Dispositif et procédé pour le traitement de données audio
US9706304B1 (en) * 2016-03-29 2017-07-11 Lenovo (Singapore) Pte. Ltd. Systems and methods to control audio output for a particular ear of a user

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5165901A (fr) * 1974-12-05 1976-06-08 Sony Corp
JPS53283A (en) 1976-06-23 1978-01-05 Desoto Inc Process for producing aqueous copolymers dispersion
JPS5419242B2 (fr) 1973-06-22 1979-07-13
JPS54109401A (en) * 1978-02-16 1979-08-28 Victor Co Of Japan Ltd Signal converter
JPS58116900A (ja) * 1982-11-15 1983-07-12 Sony Corp ステレオ再生装置
JPH01121000A (ja) * 1987-11-05 1989-05-12 Sony Corp オーディオ再生装置

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4893342A (en) * 1987-10-15 1990-01-09 Cooper Duane H Head diffraction compensated stereo system
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

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5419242B2 (fr) 1973-06-22 1979-07-13
JPS5165901A (fr) * 1974-12-05 1976-06-08 Sony Corp
JPS53283A (en) 1976-06-23 1978-01-05 Desoto Inc Process for producing aqueous copolymers dispersion
JPS54109401A (en) * 1978-02-16 1979-08-28 Victor Co Of Japan Ltd Signal converter
JPS58116900A (ja) * 1982-11-15 1983-07-12 Sony Corp ステレオ再生装置
JPH01121000A (ja) * 1987-11-05 1989-05-12 Sony Corp オーディオ再生装置

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of EP0464217A4 *

Also Published As

Publication number Publication date
DE69132430D1 (de) 2000-11-02
DE69120150D1 (de) 1996-07-18
DE69132430T2 (de) 2001-04-05
EP0464217A4 (en) 1992-06-24
EP0464217B1 (fr) 1996-06-12
KR920702175A (ko) 1992-08-12
EP0664660A2 (fr) 1995-07-26
EP0664660B1 (fr) 2000-09-27
CA2048686C (fr) 2001-01-02
CA2048686A1 (fr) 1991-07-20
EP0664660A3 (fr) 1995-08-09
DE69120150T2 (de) 1996-12-12
EP0464217A1 (fr) 1992-01-08

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