WO2006009058A1 - 音像定位装置 - Google Patents
音像定位装置 Download PDFInfo
- Publication number
- WO2006009058A1 WO2006009058A1 PCT/JP2005/013019 JP2005013019W WO2006009058A1 WO 2006009058 A1 WO2006009058 A1 WO 2006009058A1 JP 2005013019 W JP2005013019 W JP 2005013019W WO 2006009058 A1 WO2006009058 A1 WO 2006009058A1
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- sound
- frequency
- listener
- filter
- sound image
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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
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R2499/00—Aspects covered by H04R or H04S not otherwise provided for in their subgroups
- H04R2499/10—General applications
- H04R2499/11—Transducers incorporated or for use in hand-held devices, e.g. mobile phones, PDA's, camera's
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- 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
- H04R5/04—Circuit arrangements, e.g. for selective connection of amplifier inputs/outputs to loudspeakers, for loudspeaker detection, or for adaptation of settings to personal preferences or hearing impairments
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04S—STEREOPHONIC SYSTEMS
- H04S2400/00—Details of stereophonic systems covered by H04S but not provided for in its groups
- H04S2400/01—Multi-channel, i.e. more than two input channels, sound reproduction with two speakers wherein the multi-channel information is substantially preserved
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04S—STEREOPHONIC SYSTEMS
- H04S2420/00—Techniques used stereophonic systems covered by H04S but not provided for in its groups
- H04S2420/01—Enhancing the perception of the sound image or of the spatial distribution using head related transfer functions [HRTF's] or equivalents thereof, e.g. interaural time difference [ITD] or interaural level difference [ILD]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04S—STEREOPHONIC SYSTEMS
- H04S2420/00—Techniques used stereophonic systems covered by H04S but not provided for in its groups
- H04S2420/07—Synergistic effects of band splitting and sub-band processing
Definitions
- the present invention relates to a sound image localization apparatus that localizes a sound image of a sound output from a speaker of, for example, a mobile phone or a portable game machine.
- a conventional sound image localization device includes a sound image localization unit that localizes a sound image by providing a transfer characteristic for localizing the sound image in a desired direction to the sound signal, and a sound output from each of a plurality of speaker forces. And a filter that removes the effect of the transfer characteristic on the path to the left and right ears of the speaker.At least four transfer characteristics from each speaker to the listener's left and right ears are assumed in advance, and the transfer function representing the transfer characteristic is obtained. Based on the determination of the filter constant, a sound image is generated so that sound can be heard from the listener who is listening to the listener at a position where the expected transfer characteristics are obtained, even when the speaker is not placed. It can be localized in a desired direction (for example, see Patent Document 1) o
- Patent Document 1 Japanese Patent Laid-Open No. 10-70797 (Page 3-5, Fig. 1)
- the treble has a shorter wavelength than the bass, and is therefore easily affected by the listener's misalignment! / Therefore, it is difficult to localize the treble sound image with the conventional sound image localization apparatus. There was a problem. [0006]
- the present invention has been made to solve such a problem.
- the restriction of the listening range is relaxed compared to the conventional one, and the sound image can be localized in any direction around the listener. It is intended to provide a sound image localization device that can be used.
- the sound image localization apparatus of the present invention is configured to generate a sound image of a high frequency sound having a predetermined frequency or higher that is output from the left and right sound output units arranged so as to generate a sound field having a directivity of a predetermined high frequency sound.
- the high frequency localization processing means is input to the left ear of the listener in the sound field having the directivity of the predetermined high frequency sound generated by the left and right speakers.
- the high-frequency sound from the left speaker and the high-frequency sound image from the right speaker input to the right ear of the listener are localized, and the low-frequency localization processing means is applied to the left and right ears of the listener.
- the transfer function of the path from the left speaker to the right ear of the listener and the right speaker for the high-frequency sound that greatly affects the sound image localization To the listener's left ear the effect on the transfer function of the path can be avoided, and as a result, the restriction of the listening range can be relaxed compared to the conventional one, and in any direction around the listener Sound image can be localized.
- the high-frequency localization processing means includes a transfer function of a path from the target position that localizes the sound image of the high-frequency sound to the left and right ears of the listener, and the left side.
- the transfer function of the path from the sound output unit to the ear of the listener closer to the left sound output unit and the path of the path from the right sound output unit to the ear of the listener closer to the right sound output unit A configuration may be used in which the high-frequency sound image is localized based on a transfer function.
- the high-frequency localization processing means includes a high-frequency sound image. Transfer function of the path from the target position to the left and right ears of the listener and the transfer function of the path from the left acoustic output unit to the ear of the listener closer to the left acoustic output unit and the right acoustic Since the high-frequency sound image is localized based on the transfer function of the path from the output unit to the ear of the listener closer to the right-side sound output unit, the high-frequency sound that greatly affects the sound image localization is The influence on the transfer function of the route from the left speaker to the listener's right ear and the transfer function of the route from the right speaker to the listener's left ear can be avoided, and as a result, the limitation of the listening range is restricted. The sound image can be localized in any direction around the listener.
- the low-frequency localization processing means influences the target position force that localizes the sound image of the low-frequency sound and the transfer function of the path to the left and right ears of the listener.
- the low-frequency localization processing means and the left-side sound output of the transfer function of the path from the target position where the low-frequency sound image is localized to the left and right ears of the listener Transfer function of the path from the right part to the ear of the listener closer to the left acoustic output part and transfer function of the path from the right sound output part to the ear of the listener closer to the right sound output part
- the transfer function of the path from the left speaker to the listener's right ear and the right speaker to the listener's left ear are related to the high-frequency sound that greatly affects the sound image localization.
- the influence on the transfer function of the path to the user can be avoided.
- the restriction of the listening range can be relaxed compared to the conventional one, and the sound image can be localized in any direction around the listener. it can.
- the sound image localization apparatus of the present invention further includes a configuration including directivity control means for controlling the directivity of a high-frequency sound having a predetermined frequency or more output from the left and right sound output units. Also good.
- the directivity control means controls the directivity of the high frequency sound having a frequency equal to or higher than the predetermined frequency output from the left and right speaker powers, thereby increasing the high frequency from the left speaker.
- Range sound and high frequency sound from the right speaker respectively
- the sound field input to the ear and the right ear is generated, and the high frequency localization processing means includes the high frequency sound from the left speaker input to the left ear of the listener and the right speaker input to the right ear of the listener.
- the low-frequency localization processing means performs localization processing for the low-frequency sound image of the left and right speaker powers input to the left and right ears of the listener, respectively.
- the directivity control means includes a transfer function of a path from the left acoustic output unit to the ear of the listener farther from the left acoustic output unit, and the right acoustic Output unit force It may have a configuration having filter means for removing the influence of a transfer function of a path reaching the ear of the listener farther to the right acoustic output unit.
- the directivity control means includes a transfer function of a path from the left acoustic output unit to the ear of the listener farther from the left acoustic output unit, and the Directivity of high-frequency sound of a predetermined frequency or higher output from the left and right speakers so as to eliminate the influence of the transfer function of the path from the right sound output unit to the ear of the listener farther from the right sound output unit Can be controlled.
- the sound image localization apparatus of the present invention may have a configuration in which the left and right sound output units are arranged outwardly from each other.
- the sound image localization apparatus of the present invention can arrange the left and right sound output units so as to generate a sound field having a directivity of a predetermined high-frequency sound.
- the sound image localization apparatus of the present invention may have a configuration in which the left and right sound output units are arranged to face each other with a predetermined distance from the left and right ears of the listener.
- the sound image localization apparatus of the present invention can arrange the left and right sound output units so as to generate a sound field having a directivity of a predetermined high-frequency sound.
- the sound pressure level of the high frequency sound output from each of the left and right sound output units has a difference of 10 dB or more between the left ear and the right ear of the listener.
- the sound image localization apparatus of the present invention may have a configuration in which the high frequency localization processing means and the low frequency localization processing means are integrated.
- the sound image localization apparatus of the present invention integrates the high frequency localization processing means and the low frequency localization processing means, and thus separates the high frequency acoustic signal and the low frequency acoustic signal. Means are not required, and the apparatus can be simplified.
- the sound image localization apparatus of the present invention may have a configuration in which at least one of the left and right sound output units includes a plurality of speakers.
- the sound image localization apparatus of the present invention is capable of receiving a sound image of sound output from a plurality of speakers constituting at least one of the left and right sound output units as an arbitrary sound around the listener. It can be localized in the direction.
- the sound image localization apparatus of the present invention may have a configuration in which at least one of the left and right sound output units has a predetermined directivity.
- the sound image localization apparatus of the present invention relates to high-frequency sound that greatly affects sound image localization, because sound from a directional speaker is input to the left or right ear of the listener. Therefore, it is possible to avoid the influence on the transfer function of the route from the left speaker to the listener's right ear and the transfer function of the route from the right speaker to the listener's left ear, and as a result, the limitation of the listening range can be avoided.
- the sound image can be localized in any direction around the listener.
- the present invention provides a sound image localization device that has a depressing effect when the restriction of the listening range is relaxed compared to the conventional one and the sound image can be localized in any direction around the listener. Is something that can be done.
- FIG. 1 is a block diagram of a sound image localization apparatus according to a first embodiment of the present invention.
- FIG. 2 (a) Perspective view of the appearance of a mobile phone to which the sound image localization apparatus of the first embodiment of the present invention is applied. (B) The sound image localization apparatus according to the first embodiment of the present invention is applied. Mobile phone Figure showing an example of sound image localization by speech
- FIG. 3 is a flowchart of each step of the sound image localization apparatus according to the first embodiment of the present invention.
- FIG. 4 is a block diagram of low-frequency localization processing means according to the sound image localization apparatus of the first embodiment of the present invention.
- FIG. 5 is a block diagram of a sound image localization apparatus according to a second embodiment of the present invention.
- FIG. 6 is an explanatory diagram of a blind spot formed by directivity control means according to the sound image localization apparatus of the second embodiment of the present invention.
- FIG. 7 is a block diagram of directivity control means according to the sound image localization apparatus of the second embodiment of the present invention.
- FIG. 8 is a flowchart of each step of the sound image localization apparatus according to the second embodiment of the present invention.
- the sound image localization apparatus 10 includes a band dividing unit 11 that divides an input acoustic signal into a high-frequency acoustic signal and a low-frequency acoustic signal, and a high-frequency acoustic signal.
- Low-frequency localization processing means having a first filter 12 and a second filter 13 as high-frequency localization processing means for performing localization processing, and a third filter 14 and a fourth filter 15 for localization processing for low-frequency acoustic signals.
- a first adder 17 that adds the output signals of the first filter 12 and the third filter 14, and a second adder 18 that adds the output signals of the second filter 13 and the fourth filter 15. Yes.
- the sound image localization apparatus 10 is composed of, for example, a microcomputer or a DSP (Digital Signal Processor), and constitutes a left speaker 21 and a right acoustic output unit that constitute a left acoustic output unit installed in front of the listener 20. Connected to the right speaker 22.
- a microcomputer or a DSP Digital Signal Processor
- the left speaker 21 and the right speaker 22 are arranged close to each other with axes 21a and 22a indicating the sound output direction set to a predetermined angle ⁇ .
- left speaker 21 and right speaker The distance and angle ⁇ with respect to the peak force 22 is the sound pressure level force of the high frequency sound output from the left speaker 21 and the right speaker 22, respectively, for example, a difference of 10 dB or more between the left ear and the right ear of the listener 20. Is set to occur. With this arrangement, the directivity of the high frequency sound from the left speaker 21 and the right speaker 22 is set.
- the band dividing means 11 uses, for example, a frequency of 2 kHz as a reference frequency for division, and divides an input acoustic signal into a high frequency acoustic signal of 2 kHz or more and a low frequency acoustic signal of less than 2 kHz. .
- the first filter 12 and the second filter 13 are configured with, for example, a FIR (Finite Impulse Response) filter including a delay unit, a multiplier, an adder, and the like.
- FIR Finite Impulse Response
- the transfer function GLL of the route to the left ear of the listener 20 and the transfer function GRR of the right speaker 22 force to the right ear of the listener 20 is corrected.
- High-frequency component processing related to the partial transfer function is executed.
- the arbitrary direction around the listener 20 is, for example, the left rear direction of the listener 20 in FIG. T.
- the head-related transfer function refers to the transfer function of the sound from the virtual speaker 23 to the ear canal entrance of the listener 20, and in the following description, from the virtual speaker 23 to the left ear of the listener 20
- the head-related transfer function from the virtual spin 23 to the right ear of the listener 20 is AR.
- the third filter 14 and the fourth filter 15 are configured by, for example, FIR filters, and transfer functions GLL of the path from the left speaker 21 to the left ear of the listener 20 for the low-frequency acoustic signal, the left speaker 21 Transfer function GLR from the right speaker to the right ear of the listener 20 and the transfer function GRR of the path from the right speaker 22 to the right ear of the listener 20 and the transfer function GRL of the path from the right speaker 22 to the left ear of the listener 20 By correcting, low-frequency component processing related to the head-related transfer function in the target direction is executed! / Speak.
- the sound image localization apparatus 10 is applied to a mobile phone as shown in FIG. 2 (a), for example.
- the mobile phone 30 shown in FIG. 2 (a) has a keyboard 31, an LCD screen 32, and a lower part of the LCD screen 32.
- a left speaker 21 and a right speaker 22 are provided close to each other inside the housing.
- the left speaker 21 and the right speaker 22 are provided such that the sound output direction is at an angle 0 with respect to the listener 20 as described above.
- the sound pressure level force of the sound respectively output from the left-side speaker 21 and the right-side speaker 22 is set so that a predetermined sound pressure level difference is generated between the left and right ears of the listener 20.
- the sound pressure level of the sound output from the left side force 21 has a difference of 10 dB or more between the left and right ears of the listener 20! /
- the input sound signal is divided into a high frequency sound signal and a low frequency sound signal by the band dividing means 11 (step Sl l). For example, if the frequency of 2 kHz is set as a reference frequency for division, the input acoustic signal is divided into a high frequency acoustic signal of 2 kHz or more and a low frequency acoustic signal of less than 2 kHz.
- the first filter 12, the second filter 13, the third filter 14, and the fourth filter 15 execute processing of the high-frequency sound signal and the low-frequency sound signal of the head related transfer functions AL and AR.
- Step S12 the high frequency sound signal and the low frequency sound signal are processed as described below based on preset filter coefficients.
- Filter coefficients HR and HL satisfying the following equations (1) and (2) are set in the first filter 12 and the second filter 13, respectively.
- the transfer function GRR of the path from the right speaker 22 to the right ear of the listener 20 is corrected independently, and the high-frequency component related to the head-related transfer functions AL and AR in the target direction is processed.
- the first filter 12 and the second filter 13 are provided with the transfer functions AL, AR, and the left speaker of the path from the virtual speaker 23, which is the target position for localizing the high-frequency sound image, to the left and right ears of the listener.
- GRR transfer function of the path from the left side force to the listener's right ear and the right-side speaker for the high-frequency sound that greatly affects the sound image localization.
- the limitation of the listening range can be relaxed compared to the conventional one, and in any direction around the listener It is possible to localize the sound image .
- filter coefficients FR and FL satisfying the following equation (3) are set, respectively.
- the transfer function GRR of the path from the peak 22 to the right ear of the listener 20 and the transfer function GRL of the path from the right speaker 22 to the left ear of the listener 20 are corrected to reduce the head related transfer function in the target direction.
- the band component is processed.
- the filter coefficients FR and FL calculated by the inverse filter processing for the four transfer characteristics GLL, GLR, GR R and GRL and the head-related transfer functions AL and AR in the target direction Are set in the third filter 14 and the fourth filter 15, respectively.
- the acoustic signals output from the first filter 12 and the third filter 14 are added by the first adder 17, and the second filter 13 is added by the second adder 18. Then, the acoustic signal output from the fourth filter 15 is added (step S13).
- the first adder 17 and the second adder 18 output the added acoustic signals to the right speaker 22 and the left speaker 21, respectively (step S14).
- the listener 20 when the listener 20 holds the mobile phone 30 in his / her hand, the listener 20 can recognize the direction force of the virtual speaker 23 as if sound is being emitted. In addition, by changing the head-related transfer functions AL and AR, the listener 20 can recognize the directional force of the virtual speaker 24 or 25 as if sound is being emitted.
- the first filter 12 and The second filter 13 performs localization processing on the high-frequency sound signal having a high sound pressure level among the sounds input to the left and right ears of the listener 20 independently, and the third filter 14 and the fourth filter 15 Is configured to perform inverse filtering of the sound field, so that the transfer function G LR of the path from the left speaker 21 to the right ear of the listener 20 and the right speaker 22 for the high-frequency acoustic signal that greatly affects the sound image localization.
- the restriction of the listening range can be relaxed compared to the conventional one.
- the sound image can be localized in any direction around the listener 20.
- the power described with reference to the example in which the low-frequency localization processing means 16 is configured by the two filters of the third filter 14 and the fourth filter 15 is not limited to this.
- the same effect can be obtained with a configuration such as that shown in FIG.
- the low-frequency localization processing means 16 shown in FIG. 4 supplies the head-related transfer functions AR and AL in the target direction to the input low-frequency signal instead of the third filter 14 and the fourth filter 15, respectively.
- a filter 45 and a fourth inverse filter 46 are provided to eliminate the influence of the transfer characteristics GRR, GLR, GRL and GLL in the reproduction sound field.
- the fifth filter 41, the sixth filter 42, the first inverse filter 43, the second inverse filter 44, the third inverse filter 45, and the fourth inverse filter 46 are constituted by, for example, FIR filters.
- the fifth filter 41 and the sixth filter 42 add the influence of the transfer functions AR and AL of the path from the virtual speaker 23 to the left and right ears of the listener, which is the target position for localizing the low-frequency sound image.
- the first reverse filter 43, the second reverse filter 44, the third reverse filter 45, and the fourth reverse filter 46, which constitute the first filter means, are composed of the low-frequency sound image power left speaker 21 and right speaker 22
- the second filter means is configured to remove the influence of the transfer functions GRR, GLR, GRL and GLL of the path to the listener's left and right ears.
- the filter coefficients AR and AL are set for the fifth filter 41 and the sixth filter 42, respectively.
- the band dividing means 11 has been described with reference to an example in which the band dividing unit 11 is provided in the preceding stage of the first filter 12, the second filter 13, the third filter 14, and the fourth filter 15.
- the present invention is not limited to this, and the same effect can be obtained even if the band dividing means 11 is provided after the first filter 12, the second filter 13, the third filter 14, and the fourth filter 15. it can.
- the present invention is not limited to this. is not
- a right channel filter in which the first filter 12 and the third filter 14 are integrated, and a left channel filter in which the second filter 13 and the fourth filter 15 are integrated are provided. If the left channel filter performs localization processing for both high-frequency and low-frequency sound signals, the band dividing means 11, the first adder 17 and the second adder 18 can be eliminated and the configuration can be simplified. The effect of can be obtained.
- the band dividing means 11 and the low frequency localization processing means 16 are eliminated. Even if the configuration of the sound image localization apparatus 10 is simplified, the same effect can be obtained.
- the power described with reference to the example in which the sound image localization processing is performed by the two of the left speaker 21 and the right speaker 22 is not limited to this example.
- the same effect can be obtained by configuring two left speakers and one right speaker.
- one of the left speakers has a sharp directivity, and the sound pressure level input to the listener's 20 left ear is 10 dB or more higher than the sound pressure level input to the right ear. It is also possible to perform localization processing independently as left and right.
- the present invention is not limited to this example.
- the same effect can be obtained even when the left speaker 21 and the right speaker 22 are arranged opposite to each other with a predetermined distance from the left and right ears of the listener.
- the band dividing means 11 is eliminated, and the localization process similar to the localization process performed by the first filter 12 and the second filter 13 is performed.
- a configuration may be adopted in which the fourth filter 15 and the third filter 14 are respectively executed, and the localization process is controlled independently on the left and right in the entire band with respect to the input acoustic signal.
- the sound image localization apparatus 50 according to the present embodiment is directed to the subsequent stage of the first filter 12 and the second filter 13 of the sound image localization apparatus 10 according to the first embodiment of the present invention. Therefore, the other components are denoted by the same reference numerals as those of the sound image localization apparatus 10 and detailed description thereof is omitted.
- the sound image localization apparatus 50 includes a left speaker 51 and a right speaker 52 that are arranged close to each other so that the axes 51a and 52a indicating the sound output direction are substantially parallel to the front of the listener 20. Connected with. Also, the transfer function of the path from the left speaker 51 to the left ear of the listener 20 is GsLL, the transfer function GsLR of the path from the left speaker 51 to the right ear of the listener 20, and the right speaker 52 to the right of the listener 20 The transfer function GsRR for the path to the ear and the transfer function GsRL for the path from the right speaker 52 to the left ear of the listener 20 are used.
- the directivity control means 60 is composed of, for example, a microcomputer or DSP, and is a crosstalk generated between the left speaker 51 and the right speaker 52 and the left and right ears of the listener 20, that is, transfer functions GsLR and GsRL.
- the directivity of the left speaker 51 and the right speaker 52 is controlled so as to cancel the high-frequency sound signal (hereinafter referred to as “crosstalk signal”).
- crosstalk signal a blind spot (broken line portion) is formed in the direction in which the sound output from the right speaker 52 enters the left ear of the listener 20. It shall be.
- the filter coefficients FLL, FLR, FRL, and F RR set for the inverse filter 43, the second inverse filter 44, the third inverse filter 45, and the fourth inverse filter 46 are expressed as GRR in Equations (1) to (4). It can be calculated as GsRR, GLL as GsLL, GRL as GsR L, and GLR as GsLR.
- the directivity control means 60 includes, as shown in FIG. 7, for example, a first correction filter 61 and a second correction filter 62, a first directivity control filter 63, and a second directivity control filter. 64, and a third adder 65 and a fourth adder 66.
- the first directivity control filter 63 outputs a crosstalk cancel signal that cancels the crosstalk signal input from the right speaker 52 to the left ear of the listener 20 by delay processing and phase inversion processing to the left channel. It is like that.
- the delay processing refers to, for example, the time until the high-frequency sound output from the left speaker 51 is input to the right ear of the listener, and the high-frequency sound output from the right speaker 52 to the right of the listener. This is the process of matching the time until input to the ear.
- the second directivity control filter 64 outputs a crosstalk cancellation signal that cancels the crosstalk signal input from the left speaker 51 to the right ear of the listener 20 by delay processing and phase inversion processing to the right channel. It is like that.
- the delay processing refers to, for example, the time until the high frequency sound output from the right speaker 52 is input to the left ear of the listener, and the high frequency sound output from the left speaker 51 to the left of the listener. This is the process of matching the time until input to the ear.
- the first correction filter 61 corrects the deformation of the target signal caused by the crosstalk cancellation signal output from the left speaker 51 being input to the right ear of the listener 20.
- the second correction filter 62 corrects the deformation of the target signal caused by the crosstalk cancellation signal output from the right speaker 52 being input to the left ear of the listener 20.
- the third adder 65 adds the output signal of the first correction filter 61 and the output signal of the second directivity control filter 64 and outputs the result to the first adder 17.
- the fourth adder 66 adds the output signal of the second correction filter 62 and the output signal of the first directivity control filter 63 and outputs the result to the second adder 18.
- step S12 of FIG. 8 the high-frequency acoustic signals calculated by the first filter 12 and the second filter 13 are converted into the first correction filter 61 and the directivity control means 60, respectively.
- the first correction filter 61 and the second correction filter 62 are input to the second correction filter 62, and the directivity control processing of the high frequency sound signal is executed (step S21).
- filter coefficients CR and CL satisfying the following expressions (5) and (6) are set in the first correction filter 61 and the second correction filter 62, respectively.
- DR and DL are filter constants of the first directivity control filter 63 and the second directivity control filter 64, respectively, and phase inversion and delay processing are performed on the input high frequency sound signal. Is set to output a crosstalk cancellation signal.
- the high frequency acoustic signal corrected by the first correction filter 61 is output to the third adder 65 and the first directivity control filter 63.
- the high frequency sound signal corrected by the second correction filter 62 is output to the fourth adder 66 and the second directivity control filter 64.
- the high frequency acoustic signal from the first correction filter 61 and the high frequency acoustic signal from the second directional control filter 64 are added by the third adder 65 and output to the first adder 17. Is done.
- the high frequency acoustic signal from the second correction filter 62 and the high frequency acoustic signal from the first directivity control filter 63 are added by the fourth adder 66 and output to the second adder 18. .
- the first correction filter 61, the first directivity control filter 63, the second correction filter 62, and the second directivity control filter 64 are far from the left speaker to the left speaker, and are the ears of the right listener, that is, the right
- the third filter means is configured to remove the influence of the transfer function GsLR of the path to the ear and the transfer function GsRL of the path far from the right speaker to the right speaker and to the ear of the other listener, that is, the left ear.
- the directivity control means 60 is configured to set the directivity by outputting the high-frequency acoustic signal that cancels the crosstalk signal. Therefore, regarding the high frequency sound signal that greatly affects sound localization, the transfer function GsLR of the path from the left speaker 51 to the right ear of the listener 20 and the transfer function GsRL of the path from the right speaker 52 to the left ear of the listener 20 GsRL As a result, the restriction on the listening range can be relaxed compared to the conventional one, and the sound image can be localized in any direction around the listener 20.
- the force described in the example in which the left speaker 51 and the right speaker 52 are arranged close to each other so as to be substantially parallel to each other is not limited to this, for example.
- the above-mentioned is also applied to the sound forces that are arranged close to each other outward, such as the left speaker 21 and the right speaker 22 connected to the sound image localization apparatus 10 (see FIG. 1) according to the first embodiment of the present invention. Similar effects can be obtained by performing directivity control processing.
- the present invention is not limited to this example.
- the same configuration may be adopted in which two left speakers and one right speaker are configured, or one or more speakers are installed between the left speaker 51 and the right speaker 52 to perform directivity control processing. An effect can be obtained.
- a third directional filter comprising a first filter 12, a first correction filter 61 and a first directivity control filter 63, and a second filter 13, a second correction filter 62 and a second directivity control filter 64 are provided.
- a fourth directional filter In this case, filter coefficients HsR and HsL shown in the following equations (7) and (8) are set in the third directional filter and the fourth directional filter, respectively.
- HsR HR X CR + HL X CL X DL
- the power described with an example in which the sound image localization processing is performed by the left speaker 51 and the right speaker 52 is not limited to this. The same effect can be obtained even if it is composed of two or more speakers.
- the directivity of the three or more speakers is controlled by the directivity control means 60 so that directivity is added to either the left or right ear by the high frequency sound signal, and the high frequency sound signal is controlled. Therefore, the sound pressure level input to one ear is set to 10 dB or higher than the sound pressure level input to the other ear, and left and right localization processing is performed independently. By performing inverse filtering of the sound field, the same effect as when using the two speakers described above can be obtained.
- the sound image localization apparatus has an effect that the restriction of the listening range is relaxed compared to the conventional one and the sound image can be localized in any direction around the listener. It is useful as a sound image localization device that localizes the sound image of a sound output from a speaker of a mobile phone or a portable game machine.
Abstract
Description
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Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US11/571,940 US20070165890A1 (en) | 2004-07-16 | 2004-07-14 | Sound image localization device |
EP05765743A EP1775994A4 (en) | 2004-07-16 | 2005-07-14 | SOUND IMAGE LOCATING DEVICE |
JP2006529133A JPWO2006009058A1 (ja) | 2004-07-16 | 2005-07-14 | 音像定位装置 |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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JP2004-210467 | 2004-07-16 | ||
JP2004210467 | 2004-07-16 |
Publications (1)
Publication Number | Publication Date |
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WO2006009058A1 true WO2006009058A1 (ja) | 2006-01-26 |
Family
ID=35785171
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2005/013019 WO2006009058A1 (ja) | 2004-07-16 | 2005-07-14 | 音像定位装置 |
Country Status (4)
Country | Link |
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US (1) | US20070165890A1 (ja) |
EP (1) | EP1775994A4 (ja) |
JP (1) | JPWO2006009058A1 (ja) |
WO (1) | WO2006009058A1 (ja) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2011119867A (ja) * | 2009-12-01 | 2011-06-16 | Sony Corp | 映像音響装置 |
JP5448451B2 (ja) * | 2006-10-19 | 2014-03-19 | パナソニック株式会社 | 音像定位装置、音像定位システム、音像定位方法、プログラム、及び集積回路 |
Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
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US8135137B2 (en) * | 2006-03-13 | 2012-03-13 | Panasonic Corporation | Sound image localization apparatus |
ATE484761T1 (de) * | 2007-01-16 | 2010-10-15 | Harman Becker Automotive Sys | Vorrichtung und verfahren zum verfolgen von surround kopfhörern unter verwendung von audiosignalen unterhalb der maskierten hörschwelle |
JP5787128B2 (ja) * | 2010-12-16 | 2015-09-30 | ソニー株式会社 | 音響システム、音響信号処理装置および方法、並びに、プログラム |
EP3038385B1 (en) * | 2013-08-19 | 2018-11-14 | Yamaha Corporation | Speaker device and audio signal processing method |
EP3061268B1 (en) | 2013-10-30 | 2019-09-04 | Huawei Technologies Co., Ltd. | Method and mobile device for processing an audio signal |
EP3132617B1 (en) * | 2014-08-13 | 2018-10-17 | Huawei Technologies Co. Ltd. | An audio signal processing apparatus |
JP7071647B2 (ja) * | 2019-02-01 | 2022-05-19 | 日本電信電話株式会社 | 音像定位装置、音像定位方法、およびプログラム |
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2005
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- 2005-07-14 WO PCT/JP2005/013019 patent/WO2006009058A1/ja active Application Filing
- 2005-07-14 JP JP2006529133A patent/JPWO2006009058A1/ja active Pending
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Cited By (2)
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---|---|---|---|---|
JP5448451B2 (ja) * | 2006-10-19 | 2014-03-19 | パナソニック株式会社 | 音像定位装置、音像定位システム、音像定位方法、プログラム、及び集積回路 |
JP2011119867A (ja) * | 2009-12-01 | 2011-06-16 | Sony Corp | 映像音響装置 |
Also Published As
Publication number | Publication date |
---|---|
EP1775994A4 (en) | 2011-03-30 |
US20070165890A1 (en) | 2007-07-19 |
JPWO2006009058A1 (ja) | 2008-05-01 |
EP1775994A1 (en) | 2007-04-18 |
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