WO2010004649A1 - 遅延量決定装置、音像定位装置、遅延量決定方法、遅延量決定処理プログラム - Google Patents
遅延量決定装置、音像定位装置、遅延量決定方法、遅延量決定処理プログラム Download PDFInfo
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- WO2010004649A1 WO2010004649A1 PCT/JP2008/062598 JP2008062598W WO2010004649A1 WO 2010004649 A1 WO2010004649 A1 WO 2010004649A1 JP 2008062598 W JP2008062598 W JP 2008062598W WO 2010004649 A1 WO2010004649 A1 WO 2010004649A1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04S—STEREOPHONIC SYSTEMS
- H04S7/00—Indicating arrangements; Control arrangements, e.g. balance control
- H04S7/30—Control circuits for electronic adaptation of the sound field
- H04S7/302—Electronic adaptation of stereophonic sound system to listener position or orientation
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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
- H04S—STEREOPHONIC SYSTEMS
- H04S2400/00—Details of stereophonic systems covered by H04S but not provided for in its groups
- H04S2400/11—Positioning of individual sound objects, e.g. moving airplane, within a sound field
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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
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04S—STEREOPHONIC SYSTEMS
- H04S7/00—Indicating arrangements; Control arrangements, e.g. balance control
- H04S7/40—Visual indication of stereophonic sound image
Definitions
- the present application relates to a technical field of a delay amount determination device, a sound image localization device, a delay amount determination method, and a delay amount determination processing program for setting a parameter related to sound image localization in a surround system based on a subjective experiment of a listener.
- Non-Patent Document 1 Proposed a surround playback system that outputs to a speaker
- this surround playback system basically only the phase for each band is controlled, so there is little deterioration in sound quality, and information that depends on the characteristics of the listener such as the head-related transfer function is not used. , Individual differences in effects are reduced.
- Patent Document 1 moves the localization point of an audio signal along a predetermined movement locus for the purpose of performing such work easily and efficiently, and an operator can obtain an appropriate localization.
- the localization point determined to have been set is set as the localization setting position for the audio signal.
- the present application has been made in view of the above points, and an example of the problem is a delay amount determination device and a sound image localization device that can efficiently determine parameters by reducing test sounds to be heard by the user. Another object is to provide a delay amount determination method and a delay amount determination processing program.
- a delay amount determination device includes a test sound signal output unit that outputs a test sound signal, and a delay unit that delays the test sound signal according to a set delay amount. And the test sound corresponding to the test sound signal is output from one speaker and the test sound corresponding to the test sound signal delayed by the delay means is output from the other speaker. And a localization angle corresponding to the localization direction input using the input means, and the test sound with two different delay amounts, respectively.
- a comparison means for comparing a difference between one localization angle and the other localization angle when the signal is delayed with a threshold value, and while the difference is determined to be larger than the threshold value, what Control means for changing one of them, and for causing the comparison means to perform the comparison using the localization angle when the test sound signal is delayed by the changed delay amount and the other localization angle.
- Selecting means for selecting one delay amount based on a predetermined condition within a range from one of the two delay amounts to the other when the difference is determined to be smaller than the threshold; It is characterized by providing.
- the delay amount determination device a setting unit that sets the delay amount selected by the selection unit as a delay amount used by the delay unit, and the input sound signal as the one One output means for outputting to the speaker, and other output means for outputting the sound signal delayed by the delay means to the other speaker, wherein the delay means delays the sound signal.
- the delay amount determining device, the delay amount selected by the selection unit, and the delay amount calculated by the calculation unit are used as the delay amount used by the delay unit.
- a test sound signal is output, the test sound signal is delayed according to a set delay amount, and a test sound corresponding to the test sound signal is output from one speaker.
- the test sound corresponding to the delayed test sound signal in a state is input using an input means for inputting a localization direction of a sound image felt by a listener in a state where the test sound is output from the other speaker.
- a localization angle corresponding to a localization direction, and the difference between one localization angle and the other localization angle when the test sound signal is delayed by two different delay amounts, respectively, is compared with a threshold; While it is determined that the difference is larger than the threshold value, one of the two delay amounts is changed, and the localization angle when the test sound signal is delayed by the changed delay amount and With the other said localization angle
- one delay amount is selected based on a predetermined condition within a range from one of the two delay amounts at this time to the other It is characterized by doing.
- the computer corresponds to a test sound signal output unit that outputs a test sound signal, a delay unit that delays the test sound signal according to a set delay amount, and the test sound signal.
- the localization direction of the sound image felt by the listener in a state where the test sound is output from one speaker and the test sound corresponding to the test sound signal delayed by the delay means is output from the other speaker,
- a localization angle corresponding to the localization direction input using an input means for inputting, wherein one localization angle and the other when the test sound signal is delayed by two different delay amounts, respectively Comparing means for comparing a difference between the localization angle and a threshold value with a threshold value, while the difference is determined to be large, one of the two delay amounts is changed, and the test sound is changed with the changed delay amount.
- Signal Control means for causing the comparison means to perform the comparison using the localization angle when delayed and the other localization angle, and when it is determined that the difference is smaller than the threshold value, It is characterized by functioning as a selection means for selecting one delay amount based on a predetermined condition within a range from one of the two delay amounts to the other.
- FIG. It is a block diagram which shows an example of schematic structure of AV amplifier 50 which concerns on one Example.
- this surround apparatus outputs a surround signal (an example of a sound signal) as it is to one speaker, and outputs the surround signal to an all-pass filter (a delay means). In one example), after being delayed by a set delay value for each frequency band, it is attenuated and output to the other speaker.
- a surround signal an example of a sound signal
- an all-pass filter a delay means
- the surround playback system outputs the left surround signal input from the outside to the front left speaker as it is, while delaying the left surround signal with an all-pass filter and then attenuating it. It is configured to output to the right speaker. Further, the right surround signal also has the same configuration as that of the left surround signal, just by switching the left and right.
- the delay value used in the all-pass filter is an example of a delay amount, and its unit is radians.
- the delay value for each frequency band is a parameter that determines the localization angle of the sound image of the surround sound.
- the delay value setting device 10 determines an optimum delay value in a listening environment (an example of a listening environment) of a user (an example of a listener) who uses the surround reproduction system by a subjective experiment of the user.
- FIG. 1 is a block diagram showing an example of a schematic configuration of a delay value setting device 10 according to the present embodiment.
- the delay value setting device 10 constitutes a part of the surround reproduction system, but the description of the specific configuration of the surround reproduction system excluding the delay value setting device 10 is omitted. In the following, only the configuration for setting the delay value for processing the left surround signal in the surround playback system will be described, but the configuration for setting the delay value for processing the right surround signal is the same.
- the delay value setting device 10 includes a calculation unit 11 as an example of a comparison unit, a control unit, a selection unit, and a calculation unit, a storage unit 12, and a test signal as an example of a test sound signal output unit.
- the generator 13 includes a delay unit 14 as an example of a delay unit, a GUI display unit 15, and an input unit 16 as an example of an input unit.
- the calculation unit 11 includes a CPU (Central Processing Unit), a ROM (Read Only Memory), a RAM (Random Access Memory), and the like, and reads and executes various programs stored in the storage unit 12 to delay. While controlling the whole value setting apparatus 10, it functions as a comparison means, a control means, a selection means, and a calculation means.
- a CPU Central Processing Unit
- ROM Read Only Memory
- RAM Random Access Memory
- the storage unit 12 is a non-volatile storage unit such as a flash memory, for example, and stores various programs. Further, the storage unit 12 stores a delay value for each set frequency band, and previously stores an optimum delay value for a certain frequency band.
- the various programs may be supplied from a recording medium via a drive device (not shown), or may be acquired from a server device or the like via a network, or the delay value setting device 10 It may be stored in advance at the time of shipment.
- the test signal generation unit 13 supplies a test signal (an example of a test sound signal) having a frequency specified by the calculation unit 11 to the left speaker LSP and the delay unit 14.
- the delay unit 14 delays the test signal supplied from the test signal generation unit 13 by the phase indicated by the delay value designated by the calculation unit 11, and supplies the delayed test signal to the right speaker RSP. It has become.
- the GUI display unit 15 is configured by, for example, a liquid crystal display or the like, and displays characters, images, and the like based on the control of the calculation unit 11.
- the input unit 16 is configured by a pointing device such as a mouse or a touch panel, for example, and receives an operation instruction from a user and supplies the instruction content to the arithmetic unit 11 as an instruction signal.
- a pointing device such as a mouse or a touch panel
- GUI display unit 15 and the input unit 16 provide a graphical user interface for the user to input the localization position of the subjective sound image based on the test sound output from the speakers LSP and RSP.
- symbol 100 shows a user's head and the code
- optimum delay value an optimum delay value (hereinafter referred to as “optimum delay value”) to be stored in the storage unit 12 will be described with reference to FIGS. explain.
- FIG. 2 is an example of a graph showing the relationship between the delay value and the localization angle obtained in a subjective experiment.
- FIG. 3 is an example of a graph showing the relationship between the delay value and the localization angle for explaining the method for calculating the optimum delay value.
- FIG. 4 is an example of the graph which shows the result of the subjective experiment when the frequency of the test sound is 500 Hz, (a) is the graph of the subject A, and (b) is the graph of the subject B. is there.
- FIG. 5 is an example of a graph showing the result of a subjective experiment when the frequency of the test sound is 250 Hz.
- (A) is a graph of the subject A
- (b) is a graph of the subject B. is there.
- FIG. 6 is an example of the graph which shows the result of the subjective experiment when the frequency of the test sound is 125 Hz
- (a) is the graph of the subject A
- (b) is the graph of the subject B. is there.
- FIG. 7 is an example of a graph showing the relationship between the frequency and the optimum delay value obtained in a subjective experiment.
- the optimum delay value is determined for each of the two frequency bands, and thereafter, the optimum delay value for the other frequency band is determined based on the two optimum delay values.
- FIG. 2 is a graph showing the result obtained by the subject experiment conducted by the inventors of the present application at a test sound frequency of 500 Hz.
- the localization angle of the sound image of the test sound felt by the subject is from 0 to 2 ⁇ . It shows every 0.1 ⁇ radians.
- the localization angle in this case becomes larger as the direction of the sound image felt by the user spreads to the left side with the front direction of the user being 0 °.
- the localization angle when the sound image is right on the user is + 90 °, and the localization angle when the sound image is right on the user is ⁇ 90 °. Note that this is a localization angle when the test sound of the right speaker RSP is delayed, and when the test sound of the left speaker LSP is delayed, plus and minus are reversed.
- the localization angle becomes maximum when the delay value is in the vicinity of 1.2 ⁇ radians to 1.3 ⁇ radians, and this delay value becomes the optimum delay value.
- the localization angle with respect to delay values other than the above has a slight deviation, but is said to have a substantially line-symmetric relationship with the optimal delay value in the vicinity of 1.2 ⁇ radians to 1.3 ⁇ radians as the symmetry axis. Will be in good condition.
- a localization angle when the delay value is phi 0 the localization angle when the delay value is phi 1 determined by subjective experiments. Then, a subjective experiment is performed while changing ⁇ 0 or ⁇ 1 so that the values approach each other until the difference between the two localization angles becomes a predetermined threshold value or less.
- the optimum delay value is smaller than ( ⁇ 0 + ⁇ 1 ) / 2. That is, the optimum delay value, than phi 1 is considered to take a value closer to the phi 0.
- the delay value ( ⁇ 1 in the above example) with the smaller localization angle is changed to ( ⁇ 0 + ⁇ 1 ) / 2, and only this changed delay value is again obtained.
- Subjective experiments are performed.
- the average value of ⁇ 0 and ⁇ 1 at this time is set as the optimum delay value. This can reduce the number of delay values to be subjected to subjective experiments.
- the threshold may be set by the user.
- the value after the change of the delay value in the case where the subjective experiment is performed again is not necessarily limited to ( ⁇ 0 + ⁇ 1 ) / 2.
- the delay value with the larger localization angle may be changed to a value that moves away from the other delay value.
- this surround playback system creates a sound pressure dip at the ear position on one side of the listener due to mutual interference of sound waves output from the left and right (parts where the sound pressure is particularly reduced compared to other positions). This enhances the difference in sound pressure level between the listener's ears, and localizes the sound image laterally.
- the sound pressure dip moves to the right as the phase of the sound wave output from the right speaker is delayed.
- the delay amount becomes ⁇ radians in this way, the sound waves output from the left and right speakers are exactly in reverse phase on the perpendicular bisector of the line connecting the left and right speakers.
- the sound pressure level between the listener's ears is the same, and the localization angle of the sound image is 0 °. In other words, the listener feels that the sound image is located in front of him. Therefore, in order to position the sound pressure dip near the right ear, it is necessary to further delay the sound wave output from the left speaker from ⁇ radians.
- the delay amount is 2 ⁇ radians, it is equivalent to a state without phase delay, and the localization angle at this time is basically 0 °.
- the initial value of phi 0 to ⁇ radians, phi 1 of the initial value was decided to set the 2 ⁇ radians.
- subjective experiments can be omitted in the range from 0 to ⁇ radians.
- the initial value of phi 0 to (2n-1) ⁇ radian but the same applies to the initial values for the phi 1 to 2n ⁇ radians (n is 2 or more natural number), and [pi in this Of course, 2 ⁇ radians is optimal.
- ⁇ 0 and ⁇ 1 may be different from the above as long as they are within the range including the optimum delay value.
- FIG. 4A showing the result when subject A is dealt with at a frequency of 500 Hz
- the delay value with the maximum localization angle is 1.3 ⁇ radians
- FIG. 4B which shows the result when subject B is dealt with at a frequency of 500 Hz
- the delay value at which the localization angle is maximum is 1.1 ⁇ radians. Therefore, when the frequency is 500 Hz, it can be seen that there is a gap in the optimum delay value by the listener.
- FIG. 5A showing the result when subject A is dealt with at a frequency of 250 Hz
- the delay value at which the localization angle is maximum is ⁇ radians (in practice, ⁇ radians and 1.1 ⁇ radians). It is assumed that there is an optimal delay value between
- FIG. 5B showing the result when subject B is dealt with at a frequency of 250 Hz
- the delay value with the maximum localization angle is ⁇ radians. Therefore, when the frequency is 250 Hz, it can be seen that there is not much difference in the optimum delay value by the listener.
- FIG. 6A showing the result when subject A is dealt with at a frequency of 125 Hz
- the delay value at which the localization angle is maximum is ⁇ radians (actually, ⁇ radians and 1.1 ⁇ radians). It is assumed that there is an optimal delay value between
- FIG. 5B showing the result when subject B is dealt with at a frequency of 125 Hz
- the delay value at which the localization angle is maximum is ⁇ radians. Therefore, even when the frequency is 125 Hz, it can be seen that there is not much difference in the optimum delay value by the listener.
- FIG. 7 shows the result of obtaining a respective optimum delay value by conducting a subjective experiment every 1/3 octave from 125 Hz to 2000 Hz.
- this graph has a shape close to a curved shape (elliptical arc shape). Therefore, if optimum delay values at three frequencies can be obtained, optimum delay values at other frequencies can also be obtained by curve interpolation.
- the optimum delay value obtained in advance at one point in any band of 250 Hz or less is set, and subjective experiments are performed at two points in any band exceeding 250 Hz to obtain respective optimum delay values. From these three optimum delay values, optimum delay values for other bands are obtained by interpolation. As a result, the number of frequencies to be subjected to subjective experiments can be reduced.
- the optimum delay value for four or more bands may be interpolated with the optimum delay value for other frequencies. Further, for example, the optimum delay values for other bands may be interpolated with three or more optimum delay values obtained by subjective experiments.
- FIG. 8 is a flowchart showing the processing contents in the optimum delay value setting process of the delay value setting device 10 according to the present embodiment.
- FIG. 9 is a flowchart showing the processing contents in the localization experiment processing of the delay value setting apparatus 10 according to the present embodiment.
- FIG. 10A and FIG. 10B are diagrams showing display examples of the localization position answer GUI screen 300.
- the calculation unit 11 of the delay value setting device 10 displays a message on the GUI display unit 15, Prompt for input of speaker position.
- the viewing position is a distance from the center point of the left speaker LSP and the right speaker RSP to the user.
- the speaker position is the distance between the left speaker LSP and the right speaker RSP.
- the calculation unit 11 causes the GUI display unit 15 to display the localization position answer GUI screen 300 (step S1). S2).
- the localization position answer GUI screen 300 includes a left speaker mark 301, a right speaker mark 302, a user mark 303, a play button 304, a next button 305, and the like.
- Left speaker mark 301, right speaker mark 302, and user mark 303 indicate the left speaker LSP, the right speaker RSP, and the user, and the positional relationship is displayed according to the input viewing position and speaker position.
- the user operates the input unit 16 to move the pointer 306 and specify an arbitrary position on the screen, thereby specifying the localization position (or direction) of the test sound felt by the user.
- the test sound playback button 304 is a button for listening again to the test sound that the user has just listened to.
- the next button 304 is a button for listening to the next test sound (for example, a test sound having a delay value different from the test sound that has just been heard, a test sound having a different frequency, or the like).
- the delay value setting device 10 provides the user with a graphical user interface, thereby facilitating the user's answer.
- the localization position answer GUI screen 300 may be displayed as shown in FIG. 10B, for example.
- the difference from FIG. 10A is that it is displayed in a grid in FIG. 10B, and the area where the pointer 306 is located among the areas divided by the grid, as indicated by reference numeral 307, for example, Is displayed in reverse video.
- the localization position of the test sound can be specified by the user selecting an arbitrary area on the screen displayed in a grid.
- fine setting is possible, but in FIG. 10B, the user can easily answer by limiting the options.
- step S3 the calculation unit 11 sets the delay value based on the input viewing position and speaker position so that the sound image is localized in front of the user (so that the localization angle is 0 °).
- the calculation unit 11 performs a localization experiment process described later in a predetermined band 1 (for example, center frequency 500 Hz) (step S4), and then a localization experiment process in the band 2 (for example, center frequency 2000 Hz). Is executed (step S5). In this process, a subjective experiment is performed to determine the optimum delay value in the two bands.
- a predetermined band 1 for example, center frequency 500 Hz
- a localization experiment process in the band 2 for example, center frequency 2000 Hz.
- the calculation unit 11 first sets the center frequency of the set band in the test signal generation unit 13 as an experiment frequency used in the experiment (step S11).
- the arithmetic unit 11 sets a ⁇ radian to phi 0, sets the 2 ⁇ radians phi 1 (step S12).
- the computing unit 11 sets ⁇ 0 as the experimental delay value, performs subjective experiment processing with this experimental delay value, and determines ⁇ 0 at this time (step S13). Specifically, the calculation unit 11 sets an experimental delay value in the delay unit 14. Next, the calculation unit 11 controls the test signal generation unit 13 to generate a test signal at the set experimental frequency. The test signal generated by the test signal generation unit 13 is directly supplied to the left speaker LSP through and is also supplied to the delay unit 14. Then, the test signal delayed by the delay unit 14 by the set experimental delay value is supplied to the right speaker RSP. Then, test sounds having experimental frequencies are output from the left speaker LSP and the right speaker RSP, respectively.
- the user who listens to this specifies the test sound localization position by operating the input unit 16 while viewing the localization position answer GUI screen 300 displayed on the GUI display unit 15.
- Information corresponding to the specified localization position is supplied from the input unit 16 to the calculation unit 11, and the calculation unit 11 calculates ⁇ 0 based on this information, the viewing position, and the speaker position.
- ⁇ 1 is set as the experimental delay value, and subjective experiment processing is performed with this experimental delay value, and ⁇ 1 at this time is determined (step S14).
- the computing unit 11 determines whether or not
- a threshold value diff an example of a threshold value
- the arithmetic unit 11 determines whether or not ⁇ 0 is smaller than ⁇ 1 (step S17). ).
- step S17 when ⁇ 0 is smaller than ⁇ 1 (step S17: YES), the calculation unit 11 sets ⁇ 2 to ⁇ 0 (step S18), and sets ⁇ 0 after this change as an experimental delay value. After setting and performing subjective experiment processing with this experimental delay value in the same manner as in step S13 and determining ⁇ 0 at this time (step S19), the process proceeds to step S16.
- step S17 NO
- the calculation unit 11 sets ⁇ 2 to ⁇ 1 (step S20), and sets ⁇ 1 after this change as the experimental delay value. set, as in step S13, performs a subjective experiment process in this experimental delay value, upon determining a theta 1 at this time (step S21), and proceeds to step S16.
- the calculation unit 11 performs the subjective experiment with the changed delay value while changing ⁇ 0 or ⁇ 1, and when
- ⁇ 2 is set as the optimum delay value for the band (step S1), and the localization experiment process is terminated.
- the calculation unit 11 calculates the optimum delay value for the other bands (step S6). Specifically, the calculation unit 11 acquires an optimum delay value for a predetermined low band (for example, 125 Hz) from the storage unit, and uses the optimum delay value and two optimum delay values determined by subjective experiment processing. Linear interpolation is performed to calculate the optimum delay value for other bands. Then, the calculation unit 11 stores the optimum delay value determined by the subjective experiment process and the interpolated optimum delay value in the storage unit 12 as a delay value used in the surround reproduction system.
- a predetermined low band for example, 125 Hz
- the test signal generation unit 13 generates a test signal and supplies the test signal to the left speaker LSP and also to the delay unit 14. Then, the delay unit 14 delays the test signal by an amount corresponding to the experimental delay value set by the calculation unit 11, and supplies the delayed test signal to the right speaker RSP.
- the calculation unit 11 obtains a localization angle corresponding to the localization direction.
- the computing unit 11 obtains the localization angles ⁇ 0 and ⁇ 1 with two different delay values ⁇ 0 and ⁇ 1 , it compares the difference between the two localization angles with the threshold value diff.
- the calculation unit 11 changes any one of ⁇ 0 and ⁇ 1 to obtain a localization angle corresponding to the changed delay value, and The difference between the two localization angles is compared with the threshold value diff.
- the arithmetic unit 11, when it is determined that the difference is equal to or smaller than the threshold diff is in the range from phi 0 to phi 1 at this time, to select one of the delay value as an optimum delay value.
- the optimum delay value can be obtained after reducing the number of delay values that must be subjected to subjective experiments, the burden on the user due to the experiments can be reduced, and the optimum delay value can be set efficiently. it can.
- the optimum delay value can be set more efficiently. Can be sought.
- the optimal delay value can be obtained within an optimal range.
- the calculation unit 11 changes the experimental delay value with the smaller localization angle so as to approach the other experimental delay value.
- the calculation unit 11 changes the experiment delay value with the smaller localization angle to ( ⁇ 0 + ⁇ 1 ) / 2, the number of subjective experiments can be efficiently reduced.
- the calculation unit 11 determines that the difference between ⁇ 0 and ⁇ 1 is equal to or less than the threshold value diff, ( ⁇ 0 + ⁇ 1 ) / 2 is set as the optimal delay value, so that the optimal delay is more efficiently performed.
- the value can be determined.
- test signal generation unit 13 generates test signals at different timings at a plurality of different frequencies under the control of the calculation unit 11, and the calculation unit 11 is optimal for each band having these frequencies as center frequencies. A delay value is determined, and optimum delay values in other bands are calculated based on the plurality of optimum delay values.
- the optimum delay value can be obtained after reducing the number of bands in which the subjective experiment must be performed, the burden on the user due to the experiment can be reduced, and the optimum delay value can be set efficiently. it can.
- the calculation unit 11 has three delay values, that is, an optimum delay value in two bands based on a subjective experiment and an optimum delay value set in advance for a predetermined band, and an optimum delay value in other bands. Since the values are obtained by linear interpolation, the optimum delay values in all necessary bands can be obtained only by performing a subjective experiment in two bands.
- the predetermined band is selected within a range (less than about 250 Hz) that is not significantly affected by the characteristics of the listener, and the optimum delay value obtained by a subjective experiment at this time is set in advance. The optimum delay value in the band can be calculated with high accuracy.
- FIG. 11 is a block diagram illustrating an example of a schematic configuration of the AV amplifier 50 according to the present embodiment.
- the AV amplifier 50 includes a microcomputer 51, a memory 52, a decoder 53, a test signal generation circuit 54, switches 55 and 56, attenuators 57 and 60, all-pass filters 58 and 61, An adder 59 and 62, a display 63, and a mouse 64 are included.
- the microcomputer 51 constitutes comparison means, control means, selection means, calculation means, and setting means
- the test signal generation circuit 54 constitutes test sound signal output means.
- the all-pass filters 58 and 61 constitute delay means
- the adders 59 and 62 constitute one output means and the other output means
- the mouse 64 constitutes input means.
- the microcomputer 51 is composed of a CPU, ROM, RAM, and the like, and controls the AV amplifier 50 by reading and executing various programs stored in the memory 52, as well as comparison means, control means, selection means, and calculation. It functions as a means and a setting means.
- the memory 52 is a flash memory and stores various programs and optimum delay values.
- An audio stream signal As is input to the decoder 53 from the outside of the AV amplifier 50, and the decoder 53 decodes the audio stream signal As and outputs a left stereo signal L, a right stereo signal R, and a left side.
- a surround signal Ls, a right surround signal Rs, and a low sound range effect signal Lfe are output.
- the left stereo signal L output from the decoder 53 is supplied to the adder 62.
- the right stereo signal R is supplied to the adder 59.
- the left surround signal Ls is supplied to the adder 62 and the attenuator 57, respectively.
- the right surround signal Rs is supplied to the adder 59 and the attenuator 60, respectively.
- the low sound range effect signal Lfe is supplied to the subwoofer SW.
- the test signal generation circuit 54 supplies a test signal having a frequency set by the microcomputer 51 to the switches 55 and 56.
- the switch 55 has one terminal connected to the test signal generation circuit 54 and the other terminal connected to the adder 62 and the attenuator 57. When the switch 55 is turned on, the test signal from the test signal generation circuit 54 is supplied to the adder 62 and the attenuator 57.
- the attenuator 57 attenuates the left surround signal Rs supplied from the decoder 53 or the test signal supplied from the test signal generation circuit 54 (for example, 6 dB) and supplies the attenuated signal to the all-pass filter 58.
- the all-pass filter 58 delays the output signal from the attenuator 57 for each frequency band. Specifically, the all-pass filter 58 divides, for example, an output signal over 5 octaves from around 125 Hz to around 4 KHz into 1/3 octave bands, and is set by the microcomputer 51 for each divided band. The delayed delay value is combined, and the delayed signals for each frequency band are combined into one signal. The all-pass filter 58 supplies the synthesized signal to the adder 59.
- the adder 59 adds the right stereo signal R from the decoder 53, the right surround signal Rs from the decoder 53, and the output signal of the all-pass filter 58, and outputs the added signal to the right speaker RSP. It has become.
- the switch 56 has one terminal connected to the test signal generation circuit 54 and the other terminal connected to the adder 59 and the attenuator 60. When the switch 56 is turned on, the test signal from the test signal generation circuit 54 is supplied to the adder 59 and the attenuator 60.
- the attenuator 60 attenuates the right surround signal Rs supplied from the decoder 53 or the test signal supplied from the test signal generation circuit 54 (for example, 6 dB) and supplies the attenuated signal to the all-pass filter 61.
- the all-pass filter 61 delays the output signal from the attenuator 60 for each frequency band and supplies it to the adder 59.
- the configuration of the all-pass filter 61 is the same as that of the all-pass filter 58.
- the adder 62 adds the left stereo signal L from the decoder 53, the left surround signal Ls from the decoder 53, and the output signal of the all-pass filter 61, and outputs the added signal to the left speaker LSP. It has become.
- the microcomputer 51 when setting the all-pass filter 58, the microcomputer 51 first turns on the switch 55 and turns off the switch 56.
- the test signal output from the test signal generation circuit 54 is supplied to the left speaker LSP via the adder 62, and a test sound is output from the left speaker LSP.
- the test signal output from the test signal generation circuit 54 is attenuated by the attenuator 57 and further delayed by the all-pass filter 58.
- the test signal is supplied to the right speaker RSP via the adder 59, and a delayed test sound is output from the right speaker RSP.
- the microcomputer 51 appropriately changes ⁇ 0 and ⁇ 1 in the two bands and sets them as an all-pass filter, obtains the optimum delay value in each band from the optimum delay value obtained as a result, and stores it in the memory 52. .
- the microcomputer 51 when setting the all-pass filter 61, the microcomputer 51 first turns off the switch 55 and turns on the switch 56.
- the test signal output from the test signal generation circuit 54 is supplied to the right speaker RSP via the adder 59, and a test sound is output from the right speaker RSP.
- the test signal output from the test signal generation circuit 54 is attenuated by the attenuator 60 and further delayed by the all-pass filter 61.
- the test signal is supplied to the left speaker LSP via the adder 62, and a delayed test sound is output from the left speaker LSP.
- the microcomputer 51 obtains the optimum delay value in the same manner as in the case of the all-pass filter 58 and stores it in the memory 52.
- the microcomputer 51 turns off the switches 55 and 56 so that the output signal from the decoder 53 is supplied to each unit. . Further, the microcomputer 51 sets the optimal delay value for each band stored in the memory 52 in the all-pass filters 58 and 61.
- the decoder 53 decodes the signal, and the left stereo signal L, the right stereo signal R, the left surround signal Ls, the right surround signal Rs, and the bass sound effect signal. Lfe is output.
- the signal When the left surround signal Ls is supplied to the attenuator 57, the signal is delayed in the attenuator 57 and attenuated by the all-pass filter 58.
- the right surround signal Rs is supplied to the attenuator 60, the signal is delayed in the attenuator 60 and attenuated by the all-pass filter 61.
- the adder 62 adds the left stereo signal L, the left surround signal Ls, and the output signal from the all-pass filter 61, and supplies the result to the left speaker LSP.
- the adder 59 adds the right stereo signal R, the right surround signal Rs, and the output signal from the all-pass filter 58, and supplies the sum to the right speaker RSP.
- the user can enjoy surround sound suitable for his / her own characteristics and his / her listening environment.
- the present invention is not limited to 4.1 ch, and can be applied to surround playback systems such as 5.1 ch and 4 ch, for example.
- the present invention is not limited to the above embodiment.
- the above-described embodiment is an exemplification, and the present invention has the same configuration as that of the technical idea described in the claims of the present invention and exhibits the same function and effect regardless of the present invention. Are included in the technical scope.
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Abstract
Description
例えば、本願の発明者等は、入力されたサラウンド信号を、左右のスピーカのうち対応するスピーカに出力する一方、このサラウンド信号を周波数帯域毎に所定の遅延量で遅延させるとともに減衰させて、他方のスピーカに出力するサラウンド再生システムを提案した(非特許文献1)。
小幡健作、他1名、前方2つのスピーカによるサラウンド再生システム、日本バーチャルリアティ学会第12回大会論文集、2007年9月
11 演算部
12 記憶部
13 試験信号発生部
14 遅延部
15 GUI表示部
16 入力部
50 AVアンプ
51 マイコン
52 メモリ
53 デコーダ
54 試験信号発生回路
55、56 スイッチ
57、60 アッテネータ
58、61 オールパスフィルタ
59、62 加算器
63 ディスプレイ
64 マウス
100 ユーザ
200 音像
LSP 左側スピーカ
RSP 右側スピーカ
SW サブウーファ
始めに、本実施形態に係るディレイ値設定装置10が組み込まれるサラウンド再生システムの概要について説明する。
次に、本実施形態に係るディレイ値設定装置10の構成について、図1を用いて説明する。
記憶部12は、例えば、フラッシュメモリ等の不揮発性の記憶手段であり、各種プログラムを記憶している。また、記憶部12には、設定された周波数帯毎のディレイ値が記憶されているとともに、ある周波数帯域については、最適とされているディレイ値が予め記憶されている。なお、各種プログラムは、例えば、図示せぬドライブ装置を介して記録媒体から供給されても良いし、ネットワークを介して、サーバ装置等から取得するようにしても良いし、ディレイ値設定装置10の出荷時に予め記憶させておいても良い。
[3.最適ディレイ値の決定方法]
次に、本実施形態に係るディレイ値設定装置10において、記憶部12に記憶させる最適なディレイ値(以下、「最適ディレイ値」)を決定するための方法について、図2乃至図7を用いて説明する。
図2は、本願の発明者等が、試験音の周波数を500Hzとして行った主観実験で得られた結果を示すグラフであり、被験者が感じた試験音の音像の定位角を、0から2πまで0.1πラジアン毎に示している。
図4、図5及び図6は、本願の発明者等が、試験音の周波数が500Hz、250Hz及び125Hzの場合において、夫々2名の被験者を対象として主観実験を行った結果を示すグラフである。なお、左右の試験音に若干の音圧レベル差をつけたため、0ラジアンと2πラジアンとにおける定位角は、0°から若干ずれている。
次に、本実施形態に係るディレイ値設定装置10の動作について説明する。
次に、本実施形態を4.1chのサラウンド再生システムのAVアンプに適用した場合の実施例について説明する。
最適ディレイ値が設定された後、ユーザの指示によりオーディオの再生が指示されると、マイコン51は、スイッチ55及び56をOFFにさせ、デコーダ53からの出力信号が各部に供給されるようにする。また、マイコン51は、メモリ52に記憶されている帯域毎の最適ディレイ値をオールパスフィルタ58と61とに設定する。そして、デコーダ53にオーディオストリーム信号Asが入力されると、当該デコーダ53は、当該信号を復号し、左側ステレオ信号L、右側ステレオ信号R、左側サラウンド信号Ls、右側サラウンド信号Rs及び低音域効果信号Lfeを出力する。アッテネータ57に左側サラウンド信号Lsが供給されると、当該信号は、アッテネータ57において遅延させられ、オールパスフィルタ58により減衰させられる。また、アッテネータ60に右側サラウンド信号Rsが供給されると、当該信号は、アッテネータ60において遅延させられ、オールパスフィルタ61により減衰させられる。
Claims (13)
- 試験音信号を出力する試験音信号出力手段と、
設定された遅延量に応じて前記試験音信号を遅延させる遅延手段と、
前記試験音信号に対応する試験音が一方のスピーカから出力された状態で且つ前記遅延手段により遅延させられた前記試験音信号に対応する試験音が他方のスピーカから出力された状態で聴者が感じた音像の定位方向、を入力するための入力手段と、
前記入力手段を用いて入力された前記定位方向に相当する定位角であって、互いに異なる2つの前記遅延量で夫々前記試験音信号が遅延させられたときの一方の定位角と他方の定位角との差を閾値と比較する比較手段と、
前記差が前記閾値より大きいと判定されている間、前記2つの遅延量のうち何れか一方を変更し、変更した方の前記遅延量で前記試験音信号が遅延させられたときの前記定位角と他方の前記定位角とを用いて前記比較手段に前記比較を行わせる制御手段と、
前記差が前記閾値より小さいと判定された場合に、このときの前記2つの遅延量の一方から他方までの範囲内で予め定められた条件に基づいて一の遅延量を選択する選択手段と、
を備えることを特徴とする遅延量決定装置。 - 請求項1に記載の遅延量決定装置において、
前記2つの遅延量の一方の遅延量から他方の遅延量までの範囲内に前記定位角が最大となる遅延量が含まれるよう、当該2つの遅延量の初期値が設定されていることを特徴とする遅延量決定装置。 - 請求項2に記載の遅延量決定装置において、
前記2つの遅延量のうち、一方の遅延量の初期値はπラジアンに設定され、他方の遅延量の初期値は2πラジアンに設定されていることを特徴とする遅延量決定装置。 - 請求項1に記載の遅延量決定装置において、
前記制御手段は、前記2つの遅延量のうち前記定位角が小さい方を、他方の遅延量に近づくように変更することを特徴とする遅延量決定装置。 - 請求項4に記載の遅延量決定装置において、
前記制御手段は、前記2つの遅延量のうち前記定位角が小さい方を、当該2つの遅延量の平均値に変更することを特徴とする遅延量決定装置。 - 請求項1に記載の遅延量決定装置において、
前記選択手段は、前記2つの遅延量の平均値を選択することを特徴とする遅延量決定装置。 - 請求項1に記載の遅延量決定装置において、
前記試験音信号出力手段は、互いに異なる複数の周波数の前記試験音信号を発生させ、
前記選択手段は、周波数毎に遅延量を選択し、
前記選択手段により周波数毎に選択された遅延量に基づいて、前記複数の周波数を除く他の周波数における遅延量を算出する算出手段を更に備えることを特徴とする遅延量決定装置。 - 請求項7に記載の遅延量決定装置において、
前記試験音信号出力手段は、2つの周波数の前記試験音信号を発生させ、
前記算出手段は、予め定められた周波数に対して予め設定された前記遅延量と、前記選択手段により選択された2つ前記遅延量と、に基づいて、前記他の周波数における遅延量を補間することを特徴とする遅延量決定装置。 - 請求項8に記載の遅延量決定装置において、
前記予め定められた周波数は、聴者が最適な方向と感じる前記定位方向の、聴者間または聴取環境間での差が小さいとされる周波数範囲として予め定められた範囲内で設定され、
前記2つの周波数は、前記予め定められた範囲の外で設定されていることを特徴とする遅延量決定装置。 - 請求項1乃至6の何れか1項に記載の遅延量決定装置と、
前記選択手段により選択された遅延量を、前記遅延手段により用いられる遅延量として設定する設定手段と、
入力された音信号を前記一方のスピーカに出力する一方出力手段と、
前記遅延手段により遅延させられた前記音信号を前記他方のスピーカに出力する他方出力手段と、を備え、
前記遅延手段は、前記音信号を遅延させることを特徴とする音像定位装置。 - 請求項7乃至9の何れか1項に記載の遅延量決定装置と、
前記選択手段により選択された遅延量と、前記算出手段により算出された遅延量と、を、前記遅延手段により用いられる遅延量として、夫々対応する周波数に対して設定する設定手段と、
入力された音信号を前記一方のスピーカに出力する一方出力手段と、
前記遅延手段により遅延させられた前記音信号を前記他方のスピーカに出力する他方出力手段と、を備え、
前記遅延手段は、前記音信号を周波数毎に遅延させることを特徴とする音像定位装置。 - 試験音信号を出力し、
設定された遅延量に応じて前記試験音信号を遅延させ、
前記試験音信号に対応する試験音が一方のスピーカから出力された状態で且つ前記遅延させられた前記試験音信号に対応する試験音が他方のスピーカから出力された状態で聴者が感じた音像の定位方向、を入力するための入力手段を用いて入力された前記定位方向に相当する定位角であって、互いに異なる2つの前記遅延量で夫々前記試験音信号が遅延させられたときの一方の定位角と他方の定位角との差を閾値と比較し、
前記差が前記閾値より大きいと判定されている間、前記2つの遅延量のうち何れか一方を変更し、変更した方の前記遅延量で前記試験音信号が遅延させられたときの前記定位角と他方の前記定位角とを用いて前記比較を行い、
前記差が前記閾値より小さいと判定された場合に、このときの前記2つの遅延量の一方から他方までの範囲内で予め定められた条件に基づいて一の遅延量を選択することを特徴とする遅延量決定方法。 - コンピュータを、
試験音信号を出力する試験音信号出力手段、
設定された遅延量に応じて前記試験音信号を遅延させる遅延手段、
前記試験音信号に対応する試験音が一方のスピーカから出力された状態で且つ前記遅延手段により遅延させられた前記試験音信号に対応する試験音が他方のスピーカから出力された状態で聴者が感じた音像の定位方向、を入力するための入力手段を用いて入力された前記定位方向に相当する定位角であって、互いに異なる2つの前記遅延量で夫々前記試験音信号が遅延させられたときの一方の定位角と他方の定位角との差を閾値と比較する比較手段、
前記差が前記閾値より大きいと判定されている間、前記2つの遅延量のうち何れか一方を変更し、変更した方の前記遅延量で前記試験音信号が遅延させられたときの前記定位角と他方の前記定位角とを用いて前記比較手段に前記比較を行わせる制御手段、及び
前記差が前記閾値より小さいと判定された場合に、このときの前記2つの遅延量の一方から他方までの範囲内で予め定められた条件に基づいて一の遅延量を選択する選択手段、
として機能させることを特徴とする遅延量決定処理プログラム。
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