WO2007119330A1 - 音像定位装置 - Google Patents
音像定位装置 Download PDFInfo
- Publication number
- WO2007119330A1 WO2007119330A1 PCT/JP2007/054773 JP2007054773W WO2007119330A1 WO 2007119330 A1 WO2007119330 A1 WO 2007119330A1 JP 2007054773 W JP2007054773 W JP 2007054773W WO 2007119330 A1 WO2007119330 A1 WO 2007119330A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- sound image
- image localization
- transfer function
- head
- frequency component
- Prior art date
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Classifications
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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
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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
-
- 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]
-
- 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 device that localizes a sound image at an arbitrary position in a three-dimensional space.
- a conventional sound image localization device includes a head-related transfer function storage unit 901 that stores a head-related transfer function created for each position where a sound image is localized, and a target for localizing a sound image. Based on the position information, the head-related transfer function selection unit 902 that selects the head-related transfer function, and based on the selected head-related transfer function, performs the sound source signal filtering! A sound image localization processing unit 903 that outputs a sound image localization signal that has been subjected to localization processing.
- the input sound source signal is convoluted using a head-related transfer function based on the set target position information, and the sound image is localized. It is output as a localization signal to a sound reproduction device such as a headphone or a speaker.
- a sound image localization signal is output to the sound reproduction device, as shown in Fig. 21, if the peak (crest) band included in the amplitude component of the head-related transfer function H (f) exceeds OdB, the output sound image A distortion called clipping may occur in the localization signal.
- the conventional sound image localization apparatus uses a head-related transfer function that reduces the gain of the entire frequency band and prevents the peak frequency band from exceeding OdB, as shown in FIG. It is done.
- processing that does not cause clipping on the sound image localization signal is performed using a volume compression method called a limiter and a compressor.
- Patent Document 1 Japanese Patent Application Laid-Open No. 07-059187
- methods such as a limiter and a compressor are compression methods for nonlinearly manipulating the signal on the time axis, and therefore cause a nonlinear change in the frequency characteristics of the output signal, and the amplitude of the head-related transfer function
- the component for sound image localization included in the sound image localization signal is deteriorated, such as peak (crest) and dip (valley) of the component.
- Patent Document 1 when a means for suppressing the sound quality adjustment function is applied to a sound image localization device, the peak or dip of the amplitude component of the head-related transfer function is reduced. In addition, the problem that the sound image localization component included in the sound image localization signal is degraded.
- the present invention has been made to solve the conventional problems, and suppresses volume reduction of a sound image localization signal, prevents occurrence of clipping, and is used for sound image localization included in the sound image localization signal.
- the present invention provides a sound image localization apparatus capable of preventing deterioration of components.
- the sound image localization apparatus of the present invention is a sound image localization apparatus that performs sound image localization processing using a head-related transfer function, and also obtains a frequency component obtained from a sound source signal and a head-related transfer function force corresponding to a target position.
- the frequency component of the sound source signal or the head-related transfer function is determined when the clipping occurs.
- a sound image localization processing unit that performs calculation processing using the sound source signal corrected by the frequency component comparison correction unit and the head-related transfer function and outputs a sound image localization signal.
- the frequency component comparison / correction unit has a configuration in which the amplitude component suppression processing is performed in units of each dip at the peak of the head-related transfer function.
- the amplitude component is suppressed in units of the peak of the head-related transfer function or each dip. It is possible to suppress the decrease in the amount, prevent the occurrence of clipping, and not deteriorate the sound image localization component included in the sound image localization signal.
- the sound image localization apparatus of the present invention is a sound image localization apparatus that performs sound image localization processing using a head-related transfer function, and calculates and processes a sound source signal using a head-related transfer function corresponding to a target position.
- a sound image localization processing unit that outputs a sound image localization signal, and whether or not clipping is generated depending on a specific frequency band of the sound image localization signal. When the clipping occurs, the frequency of the sound image localization signal is determined.
- a frequency component correction unit that corrects the component, and the frequency component correction unit has a configuration that performs amplitude component suppression processing in units of each dip at the peak of the head-related transfer function. .
- the amplitude component is suppressed in units of the peak of the head related transfer function or each dip, so that volume reduction of the sound image localization signal is suppressed and clipping is generated.
- the sound image localization component included in the sound image localization signal can be prevented from being deteriorated.
- the present invention can reduce the volume of the sound image localization signal, prevent the occurrence of clipping, and can reduce the sound image localization component included in the sound image localization signal.
- a sound image localization apparatus is provided.
- FIG. 1 is a block diagram of a sound image localization apparatus according to a first embodiment of the present invention.
- FIG.5 Diagram showing an example of the configuration of an IIR filter for correcting the head-related transfer function
- FIG. 8 Diagram showing an example configuration of an IIR filter for correcting the head-related transfer function
- FIG. 9 Diagram showing an example configuration of an IIR filter for correcting the head-related transfer function
- FIG.10 Diagram showing an example configuration of an IIR filter for correcting the head related transfer function
- FIG. 12 Diagram showing an example of the configuration of a bike saddle type IIR filter
- FIG. 13 Diagram showing an example of the configuration of a bike saddle type IIR filter
- FIG.14 Diagram showing an example of the configuration of a bike-head type IIR filter
- FIG. 2 is a block diagram of a sound image localization apparatus according to the first other aspect of the embodiment of FIG.
- FIG. 21 Diagram showing the band that may cause clipping in the head-related transfer function
- FIG. 22 Diagram showing an example of the head-related transfer function that suppresses the occurrence of clipping
- FIG. 1 is a block diagram of a sound image localization apparatus according to the first embodiment of the present invention.
- the sound image localization apparatus shown in FIG. 1 is based on a head-related transfer function storage unit 101 that stores a head-related transfer function created for each position where a sound image is localized, and target position information that localizes a sound image.
- V head-related transfer function selection unit 102 that selects the head-related transfer function
- frequency component analysis unit 103 that analyzes the frequency component of the head-related transfer function
- the component analysis unit 104 and a frequency component comparison correction unit 105 that determines whether or not the sound image localization signal subjected to the sound image localization process causes clipping. If clipping occurs, the frequency component comparison correction unit 105 corrects the frequency component of the head related transfer function. And based on the head-related transfer function! ⁇ Do not show the sound localization signal that has been subjected to sound localization processing! And a sound image localization processing unit 106 for outputting to a sound reproducing device such as headphones.
- the head-related transfer function storage unit 101 stores in advance the head-related transfer function created for each position where the sound image is to be localized as a coefficient of a FIR (Finite Impulse Response) filter.
- FIR Finite Impulse Response
- the volume is reduced compared to the sound source signal. It may have special characteristics. In other words, this head-related transfer function may be such that the peak band exceeds OdB as shown in Fig. 21.
- These components constituting the sound image localization apparatus shown in FIG. 1 may be realized by an integrated circuit, and if the sound image localization apparatus is driven by a processor such as a CPU, these component elements Is realized by a program module.
- the head-related transfer function selection unit 102 selects a head-related transfer function from the head-related transfer function storage unit 101 according to the set target position information, The selected head-related transfer function is output to the frequency component analysis unit 103.
- the head-related transfer function corresponding to the target position does not exist, for example, based on the head-related transfer function of the target position that is close to the target position, a general interpolation process or the like is used. You can create a corresponding head-related transfer function.
- the frequency component analysis unit 103 converts the output head-related transfer function into a frequency component using a technique such as Fourier transform, and the converted frequency component is a frequency component comparison and correction unit.
- the frequency component analysis unit 104 converts the input sound source signal into a frequency component using a technique such as Fourier transform, and outputs the converted frequency component to the frequency component comparison and correction unit 105.
- the frequency component comparison / correction unit 105 determines whether clipping occurs in a specific frequency band by comparing the frequency component of the head-related transfer function with the frequency component of the sound source signal, and performs clipping. If this occurs, the frequency component of the head-related transfer function is corrected and output to the sound image localization processing unit 106.
- the specific operation of the frequency component comparison / correction unit 105 includes an amplitude component IS (f) I obtained by taking the absolute value of the normalized frequency component of the sound source signal, and head transmission. Compare the amplitude component, which is the absolute value of the frequency component of the function, with the component IH (f) I, with the sign reversed.
- the frequency fl, fu at both ends of the peak is prepared as the additional information of the HRTF in the direction of reproduction, or given force. Automatically calculated from H RTF. Based on these frequencies, an IIR filter is configured to suppress only the frequency components that cause clipping and is applied to the HRTF.
- the peak center frequency fc and bandwidth w are automatically calculated for each HRTF in the direction of reproduction. To do. Based on these frequencies, an IIR filter is constructed and applied to the HRTF so that the frequency components that cause clipping are suppressed by A L.
- the present inventor can also achieve the target by suppressing the amplitude component of at least one frequency band among the both ends of the frequency band corresponding to the peak appearing in the amplitude component of the head-related transfer function. It has been clarified that the sound image can be localized at the position (see Japanese Patent Application No. 20 04-270316).
- the frequency of the dip at both ends of the peak or the frequency at which the dip is created is fl, fu, and the HR in the direction of reproduction is shown. It is automatically calculated from the force prepared as companion information of TF or the given HRTF. Based on these frequencies, an IIR filter is constructed and applied to the HRTF so that the frequency components that cause clipping are suppressed by AL.
- the center frequency fc and the bandwidth w are set to include the dip at both ends of the peak or the dip to be created, and for each HRTF in the reproduction direction. Prepare in advance or calculate automatically from the given HRTF. Based on these frequencies, an IIR filter is constructed and applied to the HRTF so that the frequency component that causes clipping is suppressed by ⁇ L.
- the sound image localization processing unit 106 performs a multiplication operation of the frequency component corresponding to the convolution operation on the waveform of the time axis on the frequency component of the sound source signal and the frequency component of the head related transfer function, and performs the inverse operation.
- a sound image localization signal converted into a time-axis waveform is output using a technique such as Fourier transform.
- the frequency components of the sound source signal and the head-related transfer function are compared, and the frequency band in which clipping occurs and its peripheral band are used.
- the sound image localization process is performed by correcting the head-related transfer function in units of peaks or dips, thereby suppressing the volume reduction of the sound image localization signal and preventing the occurrence of clipping, and the sound image localization included in the sound image localization signal. It is possible not to degrade the ingredients for
- the frequency component comparison / correction unit 105 corrects the head-related transfer function to suppress the occurrence of clipping, but corrects the sound source signal. Therefore, an equivalent effect can be obtained.
- the head related transfer function storage unit 111 stores FIR (Finite Impulse Response).
- FIR Finite Impulse Response
- the head-related transfer function converted into frequency components is stored in advance using a method such as Fourier transform that is not a filter coefficient, and the head-related transfer function selection unit 112 is stored in the head-related transfer function storage unit 111.
- the selected head-related transfer function is selected and output according to the input target position information.
- the HRTF is configured with a plurality of IIR filters.
- the bike pad (biqu ad) Here is an example of a type IIR filter! /, but other types of IIR filters can be used!
- the head-related transfer function storage unit 101 has each IIR
- the parameters constituting the filter that is, the center frequency fc, the level L, and the sharpness Q are held, and the frequency component analysis unit 103 uses the head-related transfer function output by the head-related transfer function selection unit 102 as the frequency. analyse.
- the frequency component comparison / correction unit 105 compares the frequency component obtained from the head-related transfer function with the frequency component obtained from the sound source signal, and generates clipping. In this case, as shown in FIG. 13, the level L of the IIR filter constituting the corresponding peak is corrected so that the clipping frequency component is suppressed by AL.
- the level of the IIR filter is corrected so as to emphasize the dip at both ends, or Alternatively, an additional IIR filter may be configured to create a new dip.
- the sound image localization processing unit 106 performs filter processing on the sound source signal based on the corrected IIR filter parameters, and outputs a sound image localization signal.
- FIG. 15 is a block diagram of a sound image localization apparatus according to the second embodiment of the present invention.
- the sound image localization apparatus shown in FIG. 15 is based on a head-related transfer function storage unit 101 that stores a head-related transfer function created for each position where a sound image is localized, and target position information that localizes a sound image.
- a head-related transfer function selection unit 102 that selects a head-related transfer function; and a sound image localization processing unit 201 that performs filtering on the input sound source signal based on the head-related transfer function and performs sound image localization processing;
- a frequency component analysis unit 202 that analyzes the frequency components that make up the sound image localization signal computed by the sound image localization processing unit 201, and a frequency component correction unit that corrects the frequency component when clipping occurs in the sound image localization signal.
- the sound image localization processing unit 201 shown in FIG. 15 performs a convolution operation on the input sound source signal using the head-related transfer function output by the head-related transfer function selection unit 102, and the processed sound image
- the localization signal is output to the frequency component analysis unit 202 as an output signal. Since it is necessary to prevent clipping of the output signal, keep a wide range of output signal values. For example, when the sound image localization processing unit 201 performs digital signal processing, for example, when the output signal is 16 bits or more, the output signal is represented by a force representing an integer of 16 bits or more, or a floating point.
- the frequency component analysis unit 202 converts the sound image localization signal calculated by the sound image localization processing unit 201 into a frequency component using a technique such as Fourier transform, and outputs the frequency component to the frequency component correction unit 203.
- the frequency component correction unit 203 determines whether or not clipping occurs in a specific frequency band, and when it is determined that clipping occurs, the frequency described in the first embodiment of the present invention. Similar to the component comparison / correction unit 105, for example, by preparing the frequencies at both ends of the peak of the head-related transfer function in advance or by automatically calculating the peak or dip of the head-related transfer function, The sound image localization signal is corrected for each unit, and the sound image localization signal converted into a time-axis waveform is output using a technique such as inverse Fourier transform.
- the amplitude component IP (f) I force obtained by taking the absolute value of the frequency component of the sound image localization signal does not exceed OdB in all frequency bands. If it is ⁇ , it is determined that clipping does not occur.
- the frequency band in which clipping occurs and the amplitude corresponding to the surrounding band are generated.
- the volume reduction of the sound localization signal is suppressed.
- clipping does not occur, and the sound image localization component included in the sound image localization signal can be prevented from being deteriorated.
- the sound image localization processing section 201 and the frequency component analysis section 202 described in the second embodiment of the present invention instead, the frequency component analysis units 103 and 104 and the sound image localization processing unit 211 are provided, and the frequency corresponding to the convolution operation on the time axis waveform is applied to the sound source signal converted to the frequency component and the head related transfer function. Component multiplication is performed.
- a head-related transfer function storage unit 111 and a head-related transfer function selection unit 112 are provided instead of the component analysis unit 103, and sound image localization processing is performed using a head-related transfer function previously converted to a frequency component.
- the time length when the frequency component analysis unit 103 converts the head-related transfer function or the sound source signal into the frequency component may be the same as or shorter than the time length of the input sound source signal. It may be a long time.
- the amount of suppression of the amplitude component corresponding to the frequency band where clipping occurs is slightly reduced. May be. In this way, non-linear changes in frequency components caused by limiter and compressor processing can be reduced. It is possible not to degrade the components for sound image localization included in the sound image localization signal.
- the peak when it coincides with the direction determination band of the target direction, the peak is an important component for sound image localization, and therefore, in addition to suppressing the peak, at least one of its both ends Some dips (valleys) may be emphasized or some may be corrected to create dips.
- the peak if it does not match the direction determination band of the target direction, the peak is not an important component for sound localization, so it can be used as a correction that only suppresses the peak.
- the sound image localization apparatus uses the head-related transfer function storage unit 101 to convert the head-related transfer function to the frequency. Since it is stored as component data, it is possible to realize sound image localization with a smaller amount of computation by omitting the process of performing frequency analysis of the head-related transfer function.
- the sound image localization apparatus is limited to a frequency band in which the amplitude component corresponding to the frequency component of the head related transfer function exceeds a predetermined magnitude such as OdB.
- OdB a predetermined magnitude
- the frequency band for determining whether or not the force that causes clipping can be limited, and sound image localization can be realized with a smaller amount of computation.
- the present invention can suppress the volume reduction of the sound image localization signal, prevent the occurrence of clipping, and not deteriorate the sound image localization component included in the sound image localization signal. It is useful for all devices that perform sound reproduction, such as mobile phones that perform sound image localization processing, sound playback devices, sound recording devices, information terminal devices, game machines, conference devices, communication and broadcast systems, etc. is there.
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Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
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JP2008510761A JP4846790B2 (ja) | 2006-03-13 | 2007-03-12 | 音像定位装置 |
US12/282,414 US8135137B2 (en) | 2006-03-13 | 2007-03-12 | Sound image localization apparatus |
CN2007800127227A CN101422054B (zh) | 2006-03-13 | 2007-03-12 | 声像定位装置 |
EP07738245.5A EP1995993B1 (en) | 2006-03-13 | 2007-03-12 | Sound image localizer |
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JP2006067631 | 2006-03-13 | ||
JP2006-067631 | 2006-03-13 |
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WO2007119330A1 true WO2007119330A1 (ja) | 2007-10-25 |
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PCT/JP2007/054773 WO2007119330A1 (ja) | 2006-03-13 | 2007-03-12 | 音像定位装置 |
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US (1) | US8135137B2 (ja) |
EP (1) | EP1995993B1 (ja) |
JP (1) | JP4846790B2 (ja) |
CN (1) | CN101422054B (ja) |
WO (1) | WO2007119330A1 (ja) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
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JP2018506222A (ja) * | 2015-04-22 | 2018-03-01 | ホアウェイ・テクノロジーズ・カンパニー・リミテッド | 音声信号処理装置および方法 |
JP2019535216A (ja) * | 2016-09-28 | 2019-12-05 | ノキア テクノロジーズ オーユー | 空間オーディオシステムにおける利得制御 |
Families Citing this family (3)
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GB2540199A (en) | 2015-07-09 | 2017-01-11 | Nokia Technologies Oy | An apparatus, method and computer program for providing sound reproduction |
CN113138367A (zh) * | 2020-01-20 | 2021-07-20 | 中国科学院上海微系统与信息技术研究所 | 一种目标定位方法、装置、电子设备及存储介质 |
US11496852B2 (en) | 2020-12-03 | 2022-11-08 | Snap Inc. | Head-related transfer function |
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JP2018506222A (ja) * | 2015-04-22 | 2018-03-01 | ホアウェイ・テクノロジーズ・カンパニー・リミテッド | 音声信号処理装置および方法 |
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Also Published As
Publication number | Publication date |
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CN101422054A (zh) | 2009-04-29 |
JP4846790B2 (ja) | 2011-12-28 |
EP1995993A4 (en) | 2010-07-14 |
CN101422054B (zh) | 2011-04-13 |
JPWO2007119330A1 (ja) | 2009-08-27 |
EP1995993A1 (en) | 2008-11-26 |
US20090046865A1 (en) | 2009-02-19 |
US8135137B2 (en) | 2012-03-13 |
EP1995993B1 (en) | 2016-05-11 |
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