JP4226142B2 - Sound playback device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a sound reproduction device that performs signal processing for three-dimensional sound field reproduction, and more particularly to a sound reproduction device that can perform appropriate three-dimensional sound field reproduction.
[0002]
[Prior art]
In recent years, devices that enjoy music using headphones such as a headphone stereo have become widespread. When listening to the playback sound of these devices with headphones, the playback sound image is localized in the head and there is a problem that it sounds unnatural. In order to solve this problem, for example, signal processing of an acoustic signal is performed using a signal processing parameter such as a head-related transfer function which is an acoustic transfer characteristic from a sound source such as a speaker in a remote place to a listener's ear. An apparatus for reproducing a three-dimensional sound field by performing it has been proposed.
[0003]
By the way, as a conventional three-dimensional sound field generation device, for example, there is a “headphone” disclosed in Japanese Patent Laid-Open No. 8-79874. This headphone automatically measures the head size of each listener. FIG. 6 is a front view for explaining a part to be measured by a conventional headphone. This conventional headphone measures the total head height A, which is the vertical dimension of the head, the interaural width B, which is the dimension between both ears, and the interaural parietal arc length C.
[0004]
FIG. 7 is a perspective view showing a conventional headphone. In this conventional headphone 1, the interarbital parietal arc length measuring means 2 is configured by using the expansion / contraction mechanisms 9 </ b> A and 9 </ b> B in the headband 8, and the earphones using the contact pressure with both ears due to the elasticity of the headband 8. The inter-bead width measuring means 3 is configured. Further, speakers 14A and 14B, a total head height estimating means 5 for estimating the total head height, and a mouth position estimating means 4 for estimating the position of the mouth are provided.
[0005]
The interarbus parietal arc length measuring means 2 includes a conductor 10 attached to the center of the headband 8, and contact fittings 11A and 11B that are in sliding contact with the conductor 10 in conjunction with the expansion and contraction operations of the expansion and contraction mechanisms 9A and 9B. A voltage source (not shown) that applies a constant voltage to the closed circuit including the conductor 10 and the contact fittings 11A and 11B, and an ammeter (not shown) that measures the current flowing out from the voltage source are configured. The distance L between the contact fittings 11A and 11B is changed by the movement of the contact fittings 11A and 11B according to the movement of the expansion and contraction mechanisms 9A and 9B. The distance L is obtained, and the intercuspal parietal arc length C is measured based on the distance L. If the correspondence C = f1 (L) between the distance L and the interarbus parietal arc length C is given, the interarbus parietal arc length C is obtained from the distance L.
[0006]
The inter-trabecular width measuring means 3 is composed of pressure sensors 12A and 12B, which are mounted between the ear pads 13A and 13B and the headband 8, and which detect the pressure contact force p applied from the headband 3, and the headband 8. be able to. If the corresponding relationship B = g1 (L, p) between the interaural width B, the distance L, and the pressure p is determined, the interaural width measuring means 3 determines the interaural width B by the distance L and the pressure p. Is done. Further, the total head height estimation means 5 estimates the total head height A from the obtained interaural width B and interaural head arc length C.
[0007]
FIG. 8 is a block diagram for explaining an application example of the conventional headphones 1. In the application example of the conventional headphone 1, the interarbus parietal arc length C and the interaural width B are measured, and the interaural parietal arc length C and interaural space are used for the human head data setting means 7 using the measurement results. A width B or the like is set, and the human head data is input to the head-related transfer function calculating means 6, the head-related transfer function is calculated by the head-related transfer function calculating means 6, and the head-related transfer functions 15A and 15B are used to calculate the head-related transfer function. The part transfer function (parameter for signal processing) is convolved with the acoustic signal S given from the signal source 16. According to this conventional headphone 1, the individual head size of each listener can be automatically measured. Therefore, by applying to the stereo sound reproducing apparatus as shown in FIG. A head-related transfer function can be obtained.
[0008]
[Problems to be solved by the invention]
However, according to the above-described conventional technique, the dimensions of the listener's head are only partially measured, and the body-related elements other than the dimensions of the head, for example, reflection by parts other than the head, skeleton, and skin This does not take into account the condition of the flesh, and it is not always possible to set an appropriate signal processing parameter, so that an appropriate 3D sound field cannot be reproduced, and the listener may not be able to obtain an appropriate sound field. There was a problem.
[0009]
The present invention has been made in view of the above, and an object of the present invention is to obtain an acoustic reproduction device that can reproduce an appropriate three-dimensional sound field and allow a listener to obtain an appropriate sound field.
[0014]
[Means for Solving the Problems]
In order to solve the above-described problems and achieve the object, in the sound reproducing device according to the present invention, a sound wave for measurement near the ear of the listener. And sound waves for listening Output means, a detection means for detecting a sound field in the vicinity of the listener's ear when the output means outputs a sound wave for measurement, and a detection result of the detection means A sound transmission characteristic between the two ears, a sound transmission characteristic between the two ears and a sound transmission characteristic in one ear, and a sound transmission characteristic between the two ears calculated by the calculation means, or both Setting means for setting signal processing parameters for three-dimensional sound field reproduction based on sound transmission characteristics between ears and sound transmission characteristics in one ear, and signal processing parameters set by the setting means The acoustic signal that has been subjected to the convolution processing based on the above is output to the output means And outputting the listening sound wave from the output means. And a convolution operation unit.
[0015]
According to this sound reproducing device, a sound wave for measurement is output in the vicinity of the listener's ear, and a sound field in the vicinity of the listener's ear is detected when the sound wave for measurement is output. Calculate the sound transmission characteristics between both ears, or the sound transmission characteristics between both ears and the sound transmission characteristics in one ear, and the calculated sound transmission characteristics between both ears or the sound between both ears. Appropriate signal processing parameters for three-dimensional sound field reproduction are set based on the transmission characteristics of the sound and the sound transmission characteristics of one ear. That is, the sound transmission characteristics between the two ears of the listener, or the sound transmission characteristics between the two ears and the sound transmission characteristics in one ear are actually measured to perform signal processing for appropriate three-dimensional sound field reproduction. Set the parameters.
[0016]
In the sound reproducing device according to the next invention, the signal processing parameter is a head-related transfer function.
[0017]
According to this sound reproduction apparatus, not only the binaural time difference and the binaural sound pressure difference but also a head-related transfer function taking into account reflection and scattering are used as the signal processing parameters.
[0018]
The sound reproducing apparatus according to the next invention further includes storage means for storing a plurality of signal processing parameters prepared in advance, and the setting means includes a plurality of signal processing stored in the storage means. A signal processing parameter to be set is selected from the parameters for processing.
[0019]
According to this sound reproducing apparatus, a plurality of signal processing parameters prepared in advance are stored, and a signal processing parameter to be set is selected from the plurality of stored signal processing parameters.
[0020]
In the sound reproduction device according to the next invention, index storage means for storing an index corresponding to the set signal processing parameter;
Designating means for designating an index stored in the index storage means, and when the index is designated via the designation means, the setting means performs signal processing corresponding to the designated index. This is characterized in that a parameter is set.
[0021]
According to this sound reproducing apparatus, an index corresponding to the set signal processing parameter is stored, and when the stored index is designated, the signal processing parameter corresponding to the designated index is set.
[0022]
In the sound reproducing device according to the next invention, the output means is a headphone that outputs a sound wave for sound reproduction.
[0023]
According to this sound reproducing apparatus, the headphone that outputs the sound wave for sound reproduction is used as the output unit that outputs the sound wave for measurement, and the headphone that outputs the sound wave for sound reproduction is actually worn by the listener, The sound transmission characteristics between both ears, or the sound transmission characteristics between both ears and the sound transmission characteristics in one ear are measured to set appropriate signal processing parameters for three-dimensional sound field reproduction.
[0024]
The sound reproducing apparatus according to the next invention is characterized in that the detection means is a microphone provided integrally with the headphones.
[0025]
According to this sound reproducing apparatus, the detection means for detecting the sound field is provided integrally with the headphones as the output means.
[0026]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of a sound reproducing device according to the present invention will be described in detail with reference to the drawings.
[0027]
Embodiment 1 FIG.
FIG. 1 is a diagram illustrating a schematic configuration of the sound reproducing device according to the first embodiment of the present invention. The sound reproducing apparatus according to the first embodiment includes a headphone 21 including speakers 22A and 22B and microphones 23A and 23B, a plurality of head-related transfer functions (parameters for time domain signal processing) prepared in advance, and heads thereof. A head-related transfer function storage unit 24 that stores sound transfer characteristics corresponding to each of the head-related transfer functions, a head-related transfer function selection unit 25 that selects a head-related transfer function, an interaural transfer characteristic, and a sound in one ear The interaural transfer characteristic measuring unit 26 that measures the transfer characteristic of the signal, the signal source 27 that outputs the monaural sound signal S, and the convolution operation units 28A and 28B that perform the convolution operation are provided.
[0028]
Here, the head-related transfer function is a sound transfer characteristic from a sound source such as a speaker at a distant location to the listener's ear, and the interaural transfer characteristic is the listener's head from the left ear to the right. A characteristic of sound transmitted to the ear or from the right ear to the left ear. As parameters for signal processing, parameters derived by calculation may be used instead of the head-related transfer functions, but a more realistic sound field can be reproduced by using the actually measured head-related transfer functions. Moreover, you may use what added the inverse function of the transfer function between headphones and an ear, and various reverberation sounds to the head-related transfer function.
[0029]
The speakers 22A and 22B output sound waves in the vicinity of both ears, and the microphones 23A and 23B are installed so as to detect a sound field in the vicinity of the ear canal entrance of both ears. However, it is assumed that the microphones 23A and 23B are installed at positions where the outer ear entrance is not blocked so that the listeners can be heard when the sound signals are reproduced by the speakers 22A and 22B. In order to reduce costs, existing headphones may be used and a microphone may be provided separately. In this case, the microphone can be removed after the measurement.
[0030]
The interaural transfer characteristic measurement unit 26 outputs a measurement signal for measuring an impulse response (hereinafter referred to as a measurement signal), that is, a signal such as an impulse signal, a sine wave sweep signal, or white noise. And a measurement signal is output to the speakers 22A and 22B. Further, by analyzing signals detected by the microphones 23A and 23B when the measurement signals are output to the speakers 22A and 22B (hereinafter referred to as detection results), the interaural transfer characteristics of sound in the listener's head Then, the sound transmission characteristic in one ear is calculated, and the actual interaural transmission characteristic and the sound transmission characteristic in one ear with the headphones 21 worn are measured.
[0031]
The head-related transfer function selection unit 25 selects an appropriate head-related transfer function from among a plurality of head-related transfer functions stored in the head-related transfer function storage unit 24 based on the calculation result of the interaural transfer characteristic measuring unit 26. Select and set as a parameter for signal processing. The convolution operation units 28A and 28B receive the monaural sound signal S from the signal source 27, perform convolution processing based on the set head-related transfer function, convert the input sound signal S into a three-dimensional sound image, Are output to the left and right speakers 22A and 22B, respectively.
[0032]
Each of the data sets including the head-related transfer function and the sound transfer characteristics stored in the head-related transfer function storage unit 24 is actually measured in advance. Here, the sound transmission characteristics are composed of sound transmission characteristics in one ear and interaural transmission characteristics. FIG. 2 is a diagram illustrating a schematic configuration of a system for creating a data set including a sound transfer characteristic and a head-related transfer function according to the first embodiment. Note that the same portions as those in FIG. 1 are denoted by the same reference numerals and description thereof is omitted.
[0033]
The system for creating a data set composed of sound transfer characteristics and head-related transfer functions according to the first embodiment includes speakers 22A and 22B, an interaural transfer characteristic measuring unit 26, and sound waves around a subject. Speaker 22C for output, microphones 23C and 23D embedded in the outer ear of the subject, head-related transfer function measuring unit 29 for measuring the head-related transfer function, sound transfer characteristics in one ear, transfer characteristics between both ears, and head And a data set creation unit 30 for creating a data set composed of transfer functions.
[0034]
The binaural transfer characteristic measuring unit 26 measures the sound transfer characteristic and the binaural transfer characteristic in one ear. Similarly to the interaural transfer characteristic measuring unit 26, the head-related transfer function measuring unit 29 generates an impulse response measurement signal, that is, an impulse signal, a sine wave sweep signal, white noise, or the like, and causes the speaker 22C to generate a signal. Output. Further, the head related transfer function measuring unit 29 inputs the detection signals from the microphones 23C and 23D while outputting the measurement signal, and measures the head related transfer function.
[0035]
The speakers 22A and 22B correspond to the output means of the present invention, the microphones 23A and 23B correspond to the detection means of the present invention, and the interaural transfer characteristic measuring unit 26 corresponds to the calculation means of the present invention. The transfer function selection unit 25 corresponds to the setting means of the present invention, and the head-related transfer function storage unit 24 corresponds to the storage unit of the present invention.
[0036]
In the above configuration, the operation of the first embodiment will be described with reference to a flowchart. FIG. 3 is a flowchart of a signal processing parameter setting operation flow according to the first embodiment. In the signal processing parameter setting operation according to the first exemplary embodiment, first, the interaural transfer function is measured with the listener wearing the headphones 21. The interaural transfer characteristic measuring unit 26 outputs a measurement signal to either the speaker 22A or the speaker 22B (S31).
[0037]
For example, if a measurement signal is output to the speaker 22A located on the left side of the listener, a sound wave for measurement is output from the speaker 22A. At this time, the microphone 23A located on the left side of the listener and the microphone 23B located on the right side of the listener simultaneously detect the sound fields near the left and right outer ear entrances.
[0038]
At this time, the microphone 23A on the same side as the speaker 22A detects the measurement sound wave output from the speaker 22A at a close distance, but detects the measurement sound wave output from the speaker 22A as it is. Instead, it detects sound waves mixed with the influence of reflection from the auricle or the inner wall of the headphones 21. The influence mixed at this time is peculiar to each listener, and varies depending on the shape of the listener's pinna and the like. That is, the detection result of the microphone 23A includes various information including the shape of the listener's pinna and the like, and is specific to each listener.
[0039]
On the other hand, the microphone 23B on the right side opposite to the speaker 22A on the left side of the listener does not seem to detect anything because the sound wave is not output from the speaker 22B on the right side. When a sound wave for measurement from a certain level is large, a sound wave transmitted through the inside of the head, a sound wave transmitted through the headphone 21, and a sound wave transmitted through the atmosphere outside the headphone 21 are detected. .
[0040]
Although it is difficult to classify the path from the detected sound wave, it differs depending on the listener's head shape and the state inside the head, and is specific to each listener. That is, various information regarding the characteristics of each listener's head is included. The sound waves transmitted through the atmosphere outside the headphones 21 are somewhat affected by external factors such as the size and shape of the space in which the listener is present, but before the reflected waves from the external walls arrive. If the impulse response immediately after the sound wave output is measured, the influence of such external factors can be largely eliminated.
[0041]
The interaural transfer characteristic measuring unit 26 receives detection signals including various information about the body of the listener from the microphones 23A and 23B (S32). Subsequently, a sound transmission characteristic f (s) in one ear including various information related to the listener's body is calculated from the detection result of the microphone 23A, and various information related to the listener's body is calculated from the detection result of the microphone 23B. By calculating the interaural transmission characteristic g (s) including the sound, the sound transmission characteristic f (s) and the interaural transmission characteristic g (s) in one ear are measured (S33).
[0042]
For the transfer characteristics f (s) and g (s), for example, the Fourier transform of the measurement signal is X (s), and the Fourier transform of the detection result by the left and right microphones 23A and 23B is Ya (s) and Yb (s). , Ya (s) = f (s) X (s), Yb (s) = g (s) X (s), respectively.
[0043]
Here, a sound wave for measurement may also be output from the right speaker 22B to measure the sound transmission characteristic in the right ear and the interaural transmission characteristic from the right ear to the left ear. In addition, the interaural transfer characteristic measuring unit 26 has a noise check mechanism, detects abnormal sound during measurement or before measurement, and interrupts or reattempts measurement when the level is equal to or higher than a predetermined threshold. This noise check mechanism detects noise from a sound source other than the speakers 22A and 22B, for example, by analyzing the coherence between the measurement signal and the detection result.
[0044]
The head-related transfer function selection unit 25 inputs the sound transfer characteristic f (s) and the binaural transfer characteristic g (s) of one ear measured by the inter-aural transfer characteristic measuring unit 26, and the head-related transfer function storage unit 24 is compared with the sound transmission characteristic fn (s) and the binaural transmission characteristic gn (s) prepared in advance for one ear. Here, n is an arbitrary natural number of 0 <n ≦ N, N is a sound transfer characteristic fn (s) in one ear and a binaural transfer characteristic gn (s) stored in the head-related transfer function storage unit 24. And the number of data sets consisting of head-related transfer functions. As a result of this comparison, it is assumed that the head-related transfer functions corresponding to fn (s) and gn (s) having the highest similarity are those having the highest similarity to the head-related transfer function of the listener. A transfer function is selected (S34) and set as a signal processing parameter for the convolution operation units 28A and 28B (S35).
[0045]
Next, an operation of creating a data set composed of sound transfer characteristics in one ear, interaural transfer characteristics, and head-related transfer functions stored in the head-related transfer function storage unit 24 will be described. FIG. 4 is a flowchart illustrating a flow of a data set creation operation including sound transfer characteristics, interaural transfer characteristics, and head-related transfer functions in one ear according to the first embodiment.
[0046]
The data set consisting of the transfer characteristics of sound in one ear, the transfer characteristics between both ears, and the head-related transfer function is based on the system for creating the data set consisting of the transfer characteristics of the sound and the head-related transfer function shown in FIG. Created in advance. In the operation of creating a data set composed of sound transfer characteristics, interaural transfer characteristics, and head-related transfer functions in one ear, first, the interaural transfer characteristic measuring unit 26 performs the same as the signal processing parameter setting operation described above. A sound transfer characteristic fn (s) and an interaural transfer characteristic gn (s) in one ear are measured (S41).
[0047]
Subsequently, the head-related transfer function measurement unit 29 outputs an impulse response measurement signal to the speaker 22C, and the measurement sound wave is output from the speaker 22C. At the same time, the head-related transfer function measuring unit 29 inputs the detection results of the microphones 23C and 23D, and measures a head-related transfer function that is a transfer function between the speaker 22C and the ear of the subject (S42).
[0048]
The data set creation unit 30 inputs the sound transfer characteristic fn (s) and the interaural transfer characteristic gn (s) in one ear from the interaural transfer characteristic measurement unit 26, and receives the head transfer function measurement unit 29 from the head transfer function measurement unit 29. A transfer function is input, and a data set including a sound transfer characteristic fn (s) in one ear, an interaural transfer characteristic gn (s), and a head-related transfer function is created (S43). Here, the head-related transfer function measurement unit 29 measures a plurality of head-related transfer functions when the speaker 22C is arranged at several different positions, and the data set creation unit 30 transfers the transfer characteristics fn (s), gn. You may make it produce the data set which consists of (s) and several head related transfer functions.
[0049]
The sound transmission characteristics fn (s) and interaural transmission characteristics gn (s) in one ear and the interaural transmission characteristics are both influenced by various physical characteristics of the listener, Using a data set consisting of a sound transfer characteristic fn (s), an interaural transfer characteristic gn (s), and a head-related transfer function, the sound transfer characteristic f (s) in one ear and both measured at the time of use. An appropriate interaural transmission characteristic can be selected from the interaural transmission characteristic g (s).
[0050]
For the transfer characteristics fn (s) and gn (s), a power spectrum is obtained, and then an index is added to each data. A similar index is added to the head-related transfer function corresponding to the transfer characteristics fn (s) and gn (s). The above-described measurement is performed on many subjects, and a data set corresponding to these subjects is created, so that an appropriate head-related transfer function can be selected from a large number of actually measured values. Further, clustering or the like may be used for the classification work of these data sets to reduce the amount of work for selection.
[0051]
As described above, according to the first embodiment, in order to obtain the characteristic by actually measuring the sound transmission characteristic to the listener's head when wearing headphones, individual differences due to factors other than the dimensions of the head are also taken into consideration. And appropriate signal processing parameters can be set.
[0052]
In Embodiment 1 described above, a plurality of actually measured head-related transfer functions are prepared in advance and any one of these head-related transfer functions is selected. The head-related transfer function may be calculated from the characteristics and the interaural transfer characteristics. As a function used for this calculation, for example, a function in which a coefficient is learned using a neural network, GA (genetic algorithm), or the like may be used.
[0053]
Embodiment 2. FIG.
The sound reproduction device of the second embodiment has the same configuration as that of the sound reproduction device of the first embodiment, and the operation thereof is the same. The index of the head-related transfer function once selected is stored, and the stored index Is specified, the head-related transfer function corresponding to the specified index is set without measuring the binaural transfer function or the like.
[0054]
FIG. 5 is a diagram illustrating a schematic configuration of the sound reproducing device according to the second embodiment of the present invention. The same parts as those in FIG. 1 are denoted by the same reference numerals, description thereof is omitted, and only different parts will be described. In addition to the configuration of the sound reproduction device according to the first embodiment, the sound reproduction device according to the second embodiment includes an index storage unit 31 that stores an index corresponding to the head-related transfer function that has been set once, and an index storage unit 31. And an index designating unit 32 for designating an index stored in.
[0055]
When the interaural transfer characteristics are measured and the head-related transfer function is set, the index storage unit 31 is an index corresponding to the set head-related transfer function, for example, “1”, “2”, A number such as “3” or the name of a listener such as “Taro” or “Hanako” is stored. The index designation unit 32 displays, for example, the index stored in the index storage unit 31 and accepts the designation of the index from the user. When an index is designated via the index designation unit 32, the head-related transfer function selection unit 25 inputs and sets the head-related transfer function corresponding to the designated index from the head-related transfer function storage unit 24. That is, the listener can set an appropriate head-related transfer function only by inputting an index without performing measurement again after measuring once.
[0056]
As described above, according to the second embodiment, when the interaural transfer characteristic or the like is measured and the head-related transfer function is set, the index corresponding to the set head-related transfer function is stored. When the stored index is specified, the head related transfer function corresponding to the specified index is set. Therefore, after measuring the interaural transfer characteristics, etc., it is only necessary to input the index. It is possible to set various signal processing parameters.
[0057]
【The invention's effect】
As described above, according to the present invention, based on the sound transmission characteristics between both ears including information on individual differences due to factors other than head dimensions, that is, individual differences due to factors other than head dimensions are also present. Taking into consideration, in order to set appropriate signal processing parameters for 3D sound field reproduction, it is possible to reproduce an appropriate 3D sound field so that the listener can obtain an appropriate sound field. Play.
[0058]
According to the next invention, based on sound transmission characteristics between both ears including information on individual differences due to factors other than head dimensions and sound transmission characteristics in one ear, that is, other than head dimensions. In consideration of individual differences depending on the elements, in order to set appropriate signal processing parameters for 3D sound field reproduction, more appropriate 3D sound field reproduction is performed and the listener can obtain a more appropriate sound field. There is an effect that it can be obtained.
[0059]
According to the next invention, sound transmission characteristics between both ears of a listener or sound transmission characteristics between both ears and sound transmission characteristics in one ear are actually measured to appropriately reproduce a three-dimensional sound field. In order to set the signal processing parameters for, a more appropriate three-dimensional sound field is reproduced, and the listener can obtain a more appropriate sound field.
[0060]
According to the next invention, as the parameter for signal processing, not only the binaural time difference and the binaural sound pressure difference but also the head related transfer function taking into account reflection and scattering is used, so that a more realistic three-dimensional sound field can be obtained. Reproduction is performed, and there is an effect that the listener can obtain a more realistic sound field.
[0061]
According to the next invention, a plurality of signal processing parameters prepared in advance are stored, and a signal processing parameter to be set is selected from the plurality of stored signal processing parameters. Therefore, it is possible to set various signal processing parameters, and the listener can obtain a more appropriate sound field.
[0062]
According to the next invention, an index corresponding to the set signal processing parameter is stored, and when the stored index is designated, the signal processing parameter corresponding to the designated index is set. The listener can easily set appropriate signal processing parameters simply by specifying an index, and the operability is improved.
[0063]
According to the next invention, the headphones for outputting the sound waves for sound reproduction are used as the output means for outputting the sound waves for measurement, and both the headphones for outputting the sound waves for sound reproduction are actually worn by the listener. In order to set the appropriate signal processing parameters for 3D sound field reproduction by measuring the transmission characteristics of the sound between the ears, or the transmission characteristics of the sound between both ears and the transmission characteristics of the sound in one ear, An appropriate three-dimensional sound field is reproduced, and the listener can obtain a more appropriate sound field.
[0064]
According to the next invention, since the detection means for detecting the sound field is provided integrally with the headphones as the output means, there is an effect that it is easy to handle.
[Brief description of the drawings]
FIG. 1 is a diagram illustrating a schematic configuration of a sound reproduction device according to a first embodiment of the present invention.
FIG. 2 is a diagram illustrating a schematic configuration of a system for creating a data set including a sound transfer characteristic and a head-related transfer function according to the first embodiment;
FIG. 3 is a flowchart of a signal processing parameter setting operation according to the first embodiment;
FIG. 4 is a flowchart showing a flow of a data set creation operation including sound transfer characteristics, interaural transfer characteristics, and head-related transfer functions in one ear according to the first embodiment;
FIG. 5 is a diagram showing a schematic configuration of a sound reproduction device according to a second embodiment of the present invention.
FIG. 6 is a front view for explaining a part to be measured by a conventional headphone.
FIG. 7 is a perspective view showing a conventional headphone.
FIG. 8 is a block diagram for explaining an application example of a conventional headphone.
[Explanation of symbols]
21 Headphone, 22A, 22B, 22C Speaker, 23A, 23B, 23C, 23D Microphone, 24 Head Transfer Function Storage Unit, 25 Head Transfer Function Selection Unit, 26 Interaural Transfer Characteristic Measurement Unit, 27 Signal Source, 28A, 28B convolution operation unit, 29 head related transfer function measurement unit, 30 data set creation unit, 31 index storage unit, 32 index designation unit.

Claims (6)

Output means for outputting a sound wave for measurement and a sound wave for listening near the listener's ear;
Detecting means for detecting a sound field in the vicinity of a listener's ear when the output means outputs a sound wave for measurement;
A calculation means for inputting a detection result of the detection means and calculating a sound transmission characteristic between both ears, or a sound transmission characteristic between both ears and a sound transmission characteristic in one ear;
Signal processing parameters for three-dimensional sound field reproduction based on the sound transmission characteristics between both ears calculated by the calculating means, or the sound transmission characteristics between both ears and the sound transmission characteristics in one ear. Setting means for setting;
A convolution operation unit that outputs an acoustic signal subjected to convolution processing based on the signal processing parameter set by the setting unit to the output unit, and outputs the acoustic wave for listening from the output unit ;
A sound reproducing device comprising:   The sound reproduction device according to claim 1, wherein the signal processing parameter is a head-related transfer function.   Furthermore, it comprises storage means for storing a plurality of signal processing parameters prepared in advance, and the setting means selects a signal processing parameter to be set from among the plurality of signal processing parameters stored in the storage means. The sound reproducing device according to claim 1, wherein the sound reproducing device is selected. Further, index storage means for storing an index corresponding to the set signal processing parameter;
Designation means for designating an index stored in the index storage means;
Comprising
The said setting means sets the parameter for signal processing corresponding to the designated index, when an index is designated via the said designation | designated means, The Claim 1 characterized by the above-mentioned. Sound reproduction device.   The sound reproduction apparatus according to claim 1, wherein the output unit is a headphone that outputs sound waves for sound reproduction.   The sound reproducing apparatus according to claim 5, wherein the detection unit is a microphone provided integrally with the headphones.

Images