CN111031467A - Method for enhancing front and back directions of hrir - Google Patents
Method for enhancing front and back directions of hrir Download PDFInfo
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- CN111031467A CN111031467A CN201911379790.8A CN201911379790A CN111031467A CN 111031467 A CN111031467 A CN 111031467A CN 201911379790 A CN201911379790 A CN 201911379790A CN 111031467 A CN111031467 A CN 111031467A
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- Prior art keywords
- hrir
- impulse response
- room
- azimuth
- dry audio
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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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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S3/00—Direction-finders for determining the direction from which infrasonic, sonic, ultrasonic, or electromagnetic waves, or particle emission, not having a directional significance, are being received
- G01S3/80—Direction-finders for determining the direction from which infrasonic, sonic, ultrasonic, or electromagnetic waves, or particle emission, not having a directional significance, are being received using ultrasonic, sonic or infrasonic waves
- G01S3/802—Systems for determining direction or deviation from predetermined direction
- G01S3/8027—By vectorial composition of signals received by plural, differently-oriented transducers
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S3/00—Direction-finders for determining the direction from which infrasonic, sonic, ultrasonic, or electromagnetic waves, or particle emission, not having a directional significance, are being received
- G01S3/80—Direction-finders for determining the direction from which infrasonic, sonic, ultrasonic, or electromagnetic waves, or particle emission, not having a directional significance, are being received using ultrasonic, sonic or infrasonic waves
- G01S3/802—Systems for determining direction or deviation from predetermined direction
- G01S3/803—Systems for determining direction or deviation from predetermined direction using amplitude comparison of signals derived from receiving transducers or transducer systems having differently-oriented directivity characteristics
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- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- General Physics & Mathematics (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Stereophonic System (AREA)
Abstract
The invention discloses a method for enhancing the front and back directions of hrir, which comprises the following specific steps: A. setting the room to be rectangular; setting the position of a microphone; obtaining an indoor impulse response H (b) under the room type; B. applying the room impulse response h (b) to filter the mono "dry audio" x (n); C. after the filtering processing is carried out on the 'dry audio', the virtual sound synthesized by the filtered 'dry audio' and the hrir at the front and rear positions has obvious azimuth sense. Compared with the method of modifying the amplitude of hrir to realize front and rear bit enhancement, the method does not need to process the hrir. And the virtual sound synthesized by the method provided by the patent has the effect of externalizing the head.
Description
Technical Field
The invention relates to the technical field of positioning, in particular to a method for enhancing the front and back directions of hrir.
Background
The perception of sound orientation by the human ear is achieved by binaural level Difference (ILD) and binaural Time Difference (ITD), which is a well-known "duplex theory". When a sound comes from a certain direction, a pair of ITD and ILD is generated at two ears, and the receiver judges the direction of the current sound according to the difference of the received ITD and ILD. However, if the ITDs and ILDs are both at the same orientation, e.g., (0 ° ) and (0 °,180 °), and the ITDs and ILDs are the same, the listener always hears the same orientation in the middle of the head, called "head-in-head positioning". When the ITDs and ILDs of both orientations are the same, the application of duplex theory has not been able to localize the sound.
The document "Improvement of front-back localization characteristics in the 7th International Conference on advanced Communication Technology,2005, ICACT 2005" provides a method for enhancing the front and back orientations to achieve the front and back orientations, which uses a spectral difference method to achieve the front and back orientations. However, this method changes the spectrum of the original hrir signal. By analyzing the correlation between hrir and the physiological parameter, the physiological parameter affecting hrir at (0 degrees ) is different from the physiological parameter affecting hrir at (180 degrees, 0 degrees), and by analyzing the correlation between orientation enhancement by spectral subtraction and the physiological parameter, the physiological parameter related to hrir after the method is applied is changed compared with hrir without orientation enhancement. This is not in accordance with the actual situation. This method is possible in the sense of auditory perception, but it is not clearly explained in a physical sense.
The patent numbers are: the patent of CN2019102017118 starts with a method of increasing a slight head offset to improve front-back orientation positioning, and the improved method can realize front-back positioning.
Disclosure of Invention
The present invention aims to provide a hrir front-back direction enhancing method to solve the problems in the background art.
In order to achieve the purpose, the invention provides the following technical scheme:
an hrir front and back direction enhancing method comprises the following specific steps:
A. setting the room to be rectangular; setting the position of a microphone; obtaining an indoor impulse response H (b) under the room type;
B. applying the room impulse response h (b) to filter the mono "dry audio" x (n);
C. the filtered "dry audio" s (n) is convolved with the hrir of the (0 ° ) azimuth to obtain the acoustics of that azimuth.
As a further scheme of the invention: the room set in the step A has the length of 20m, the width of 20m and the height of 4 m.
As a further scheme of the invention: the microphone positions are 5m, 5m and 1 m.
As a further scheme of the invention: the formula adopted in step B is s (n) ═ H (1) x (n) + H (2) x (n-1) + … + H (nb +1) x (n-nb).
As a further scheme of the invention: the formula adopted in the step C is
Wherein phi is a pitch angle, theta is an azimuth angle, hrir is an azimuth angle in the head-related impulse response database, and pitching is an impulse response corresponding to phi.
As a further scheme of the invention: the microphone position is set to be non-directional.
As a further scheme of the invention: and obtaining the indoor impulse response H by adopting a virtual sound source method.
Compared with the prior art, the invention has the beneficial effects that: after the 'dry audio frequency' is filtered, the virtual sound synthesized by the filtered 'dry audio frequency' and the hrir at the front and rear positions has obvious azimuth sense. Compared with the method of modifying the amplitude of hrir to realize front and rear bit enhancement, the method does not need to process the hrir. And the virtual sound synthesized by the method provided by the patent has the effect of externalizing the head.
Drawings
FIG. 1 is a schematic diagram of a front-to-back orientation enhancement method.
Fig. 2 is a room impulse response diagram.
FIG. 3 is a diagram of the original sound effect response.
FIG. 4 shows the sound effect after filtering as a response diagram.
Fig. 5 is a graph of left ear sound effect response after the prescription bit enhancement in the (0 ° ) azimuth.
FIG. 6 is a graph of the (0, 0) azimuth front-position enhanced rear right ear sound effect response.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1-6, in an embodiment of the present invention, a method for enhancing hrir anteroposterior direction includes the following steps:
A. setting the size and shape of a room, setting the position and type of a microphone, and obtaining the simulated impulse response H (b) of an indoor sound field with the shape by applying a virtual sound source method;
B. filtering the monaural 'dry audio' x (n) by using an indoor impulse response H, and outputting filtered 'dry audio's (n);
s(n)＝H(1)x(n)+H(2)x(n-1)+…+H(nb+1)x(n-nb) (1)
C. the filtered "dry audio" is convolved with hrir with 0 ° or 180 ° orientation to obtain the sound effect of that orientation.
Wherein phi is a pitch angle, theta is an azimuth angle, hrir is an azimuth angle in the head-related impulse response database, and pitching is an impulse response corresponding to phi.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (7)
1. An hrir front and back direction enhancing method is characterized by comprising the following specific steps:
A. setting the room to be rectangular; setting the position of a microphone; obtaining an indoor impulse response H (b) under the room type;
B. applying the room impulse response h (b) to filter the mono "dry audio" x (n);
C. the filtered "dry audio" s (n) is convolved with the hrir of the (0 ° ) azimuth to obtain the acoustics of that azimuth.
2. An hrir fore-aft direction enhancement method as claimed in claim 1, wherein said step a is provided with a room length of 20m, a width of 20m and a height of 4 m.
3. An hrir front-back orientation enhancement method according to claim 1, wherein said microphone positions are 5m, 5m and 1 m.
4. An hrir front-back orientation enhancement method according to claim 2, wherein said formula in step B is s (n) ═ H (1) x (n) + H (2) x (n-1) + … + H (nb +1) x (n-nb).
5. A hrir anteroposterior direction enhancement method as claimed in claim 2, wherein said step C uses the formula of
Wherein phi is a pitch angle, theta is an azimuth angle, hrir is an azimuth angle in the head-related impulse response database, and pitching is an impulse response corresponding to phi.
6. An hrir front-back orientation enhancement method according to claim 2, wherein said microphone location is set to be non-directional.
7. The method of claim 1, wherein said room impulse response H is obtained by a virtual source method.
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| CN201911379790.8A CN111031467A (en) | 2019-12-27 | 2019-12-27 | Method for enhancing front and back directions of hrir |
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| CN201911379790.8A CN111031467A (en) | 2019-12-27 | 2019-12-27 | Method for enhancing front and back directions of hrir |
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| CN102665156A (en) * | 2012-03-27 | 2012-09-12 | 中国科学院声学研究所 | Virtual 3D replaying method based on earphone |
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