CN1108083C - Headphone reproducing apparatus - Google Patents
Headphone reproducing apparatus Download PDFInfo
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- CN1108083C CN1108083C CN96108997.0A CN96108997A CN1108083C CN 1108083 C CN1108083 C CN 1108083C CN 96108997 A CN96108997 A CN 96108997A CN 1108083 C CN1108083 C CN 1108083C
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04S—STEREOPHONIC SYSTEMS
- H04S5/00—Pseudo-stereo systems, e.g. in which additional channel signals are derived from monophonic signals by means of phase shifting, time delay or reverberation
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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
- H04S7/303—Tracking of listener position or orientation
- H04S7/304—For headphones
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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]
Abstract
A headphone reproducing apparatus creates a virtual sound. A delay circuit delays a first-channel input audio signal and a second-channel input audio signal by predetermined delay times. A low-pass filter changes frequency characteristics of the first- and second-channel input signals to predetermined frequency characteristics. A multiplier changes sound levels of the first- and second-channel input audio signals to predetermined sound levels. The delay circuit, low-pass filter, and multiplier are connected in series to each other. A headphone reproduces the first- and second-channel input signals processed by the delay circuit, low-pass filter, and multiplier as the sound that comes from the virtual sound source.
Description
Technical field
The present invention relates to Headphone reproducing apparatus, particularly acoustic image is positioned at Headphone reproducing apparatus away from the listeners head position.
Background technology
A kind of processing audio signal that is used for is described below with reference to the accompanying drawings, so that acoustic image is positioned at the conventional Headphone reproducing apparatus away from the listeners head position.
Fig. 1 illustrate when a speaker playback voice signal obtainable from the loud speaker to listener the transmission characteristic of right and left ear.In addition, Fig. 2 is the block diagram of conventional Headphone reproducing apparatus, and Fig. 3 is the block diagram of FIR (finite impulse response (FIR)) type digital filter (convolutional calculation device).
As shown in Figure 1, when the listener hears from sound that the loud speaker 40 that is positioned at a certain position is reset, be sent to listener 41 sound from loud speaker 40 and can be respectively represent by two different tansfer function h1 (n) (from loud speaker 40 to left ear 41L) and hr (n) (from loud speaker 40 to auris dextra 41R).In addition, in Headphone reproducing apparatus shown in Figure 2, these two tansfer function h1 (n) and hr (n) are with synthetic via the input signal X (n) of input 51 inputs.Acoustic image by loud speaker 40 location is reset via earphone 52 with imaginary loudspeaker sound manner of playback.
In above-mentioned the synthesizing of two tansfer function h1 (n) and hr (n), a left side that adopt to utilize the imitation head or measured by the listener and the impulse response of auris dextra are (promptly, tansfer function), with utilize a signal processing unit (for example, digital signal processing unit) that convolutional calculation is carried out in measured impulse response and input signal.
Specifically, the signal via input 51 inputs is divided into left channel signals and right-channel signals.Then the signal that separates is applied to left convolutional calculation device 53L and right convolutional calculation device 53R, separately carries out convolutional calculation.In addition, be sent separately the L channel 52L and the R channel 52R of earphone 52 from the signal of two convolutional calculation device 53L and 53R output.
Herein, convolutional calculation can be expressed from the next
y1(n)＝x(n)*h1(n)
Yr (n)=x (n) * hr (n) wherein, x (n): the discrete signal string of input signal
H1 (n): impulse response from loud speaker to left ear
Hr (n): the impulse response from the loud speaker to the auris dextra
Y1 (n): the earphone L channel is put the discharge signal string
Yr (n): earphone R channel discharge signal string
Be to carry out the convolutional calculation of impulse response (being tansfer function), two calculator 53L and 53R must constitute multiple spot Finite Impulse Response filter 60 as shown in Figure 3.Multiple spot Finite Impulse Response filter 60 comprises the convolution (h (0) is to h (n) expression multiplier) and the adder 63 of single sample value delay device 61, multiplier 62, each multiplier 62 execution impulse response, and each adder is used for the output addition to multiplier 62.
The conventional Headphone reproducing apparatus that constitutes by above-mentioned form has following defective, for example, when impulse response (tansfer function) and supplied with digital signal convolution in the sampling of 44100Hz sampling frequency, must duplicate delays, multiplication and add operation reach 44100 times, so that make the impulse response and the input signal convolution in a second only.
In addition, when considering that indoor reflected sound also needs playback to echo characteristic, because the time span of tansfer function prolongs the quantity of necessary further increase FIR type digital filter 60.
Therefore, existing problem is that to be used for the hardware size of digital signal processing unit huge, therefore, realizes that by earphone the sound reproduction of imaginary loud speaker is than difficulty so far.
In addition, the open No.3 (1991)-250899 of Japan Patent has disclosed a kind of Headphone reproducing apparatus of (extra-head) acoustic image location of the extra head that starts with simple structure.In this device, form reflected sound according to the monophone input signal with different time of delays and unlike signal level.Then, according to forming a left side and right crosstalk signal by reflected sound being added to the signal that input signal obtains.Reflected signal and formed crosstalk signal are joined this input signal.And, reset independently on a left side and the right side of earphone through the signal that adds.
Specifically, this routine Headphone reproducing apparatus has two reflected sounds that are used for right and left ear and forms system, and each system has delay and multiplier.Form a left side and right two signals respectively by add two kinds of different reflected sounds (left ear reflex sound and auris dextra reflected sound) to input signal.In addition, form right crosstalk signal according to the left signal by right filter respectively and the right signal by left filter forms left crosstalk signal.In addition, the crosstalk signal of the reflected sound that forms and formation is added to separately input signal in a left side and right both sides.Such two added signal can be reset independently on a left side and the right side of earphone.
In addition, this Japan's publication discloses the another kind of Headphone reproducing apparatus that signal reflex sound forms system that has, and in this case, forms system by signal reflex sound and is divided into two signals by reflected sound being joined signal that input signal obtains.In other words, a left side and auris dextra use same reflected sound.In addition, being added to the basis of the signal that input signal obtains by two different left sides and right filter on, reflected sound forms a left side and right crosstalk signal.In addition, the crosstalk signal of the reflected sound that forms and formation is added to separately input signal in a left side and right both sides.Such two added signal can be reset independently on a left side and the right side of earphone.
In other words, in conventional Headphone reproducing apparatus, be example with left ear, at first form the input signal that is added into left reflected sound.Then, form left crosstalk signal according to the input signal that adds left reflected sound.Before the playback, input signal and the left crosstalk signal that adds left reflected sound joined the monophone input signal.
Yet in aforesaid conventional Headphone reproducing structure, owing to only form a plurality of reflected sounds by changing input signal time of delay and signal level, its sense of direction (transmission characteristic) is not synthesized.In other words, only be that reflected sound is in statu quo joined input signal, and do not provide tangible sense of direction listener's a left side and auris dextra.In addition, the crosstalk signal that forms according to reflected sound is formed on a left side and the right side of separation according to the same signal that adds reflected sound.In other words, each reflected sound is not formed crosstalk signal respectively.
Therefore, in conventional Headphone reproducing apparatus,, each reflected sound of each reflected sound is not handled though sound can be launched a little.Can not obtain clear sense of direction to sound source.In other words, existing problem is to have reset to be different from actual indoor sound field.Therefore, can not reach the acoustic image location of extra head true to nature.
In addition, a problem in this case is that phase control is to carry out in the mode that can eliminate the correlation between a left side and the right signal, so that acoustic image is positioned at outside the listeners head.Owing to can not position this acoustic image clearly, the unsharp problem of Sounnd source direction sense occur.
In addition, in conventional Headphone reproducing apparatus, when the listener moved its head, because the auditory localization position is also mobile thereupon, sound perception was natural.This makes Headphone reproducing lack the sense of reality.
Summary of the invention
Consider these problems, therefore, the purpose of this invention is to provide a kind of Headphone reproducing apparatus, except that hardware size was little, this Headphone reproducing apparatus can be positioned at acoustic image outside the listeners head by the sense of direction (transmission characteristic) of synthetic sound source.
For achieving the above object, the invention provides a kind of device that is used to produce virtual sound, make the listener feel that sound seems from a virtual sound source that is present in away from certain space of listener with imagining, this device comprises: deferred mount is used for the first sound channel input audio signal and the second sound channel input audio signal are postponed scheduled delay; The frequency characteristic conversion equipment is used for converting the frequency characteristic of the first and second sound channel input audio signals to the preset frequency characteristic; Multiplier is used for converting the sound level of the first and second sound channel input audio signals to the predetermined sound level, and this deferred mount and first and second device are cascaded mutually; And replay device, first and second channel input signals that are used for being handled by deferred mount and frequency characteristic conversion equipment and multiplier are as the sound reproduction from virtual sound source.
This frequency characteristic conversion equipment can comprise a low pass filter.
The present invention also provides a kind of device, be used for producing virtual sound according to the audio signal of input, make the listener feel that sound seems the virtual sound source away from this listener of being present in from the imagination, this device comprises: deferred mount, be used for will with disclosed first channel input signal of input audio signal and the second channel input signal delay scheduled time, the frequency characteristic of first and second channel input signals is changed over the preset frequency characteristic, the sound level of first and second channel input signals is changed over the predetermined sound level; The multilevel delay device is used for a plurality of scheduled delays of another signal delay that will separate with this input audio signal, with output multilevel delay signal; Processing unit, be used for a plurality of triple-track input signals and a plurality of falling tones road input signal are postponed a plurality of scheduled times, third and fourth channel input signal separates with the multilevel delay signal, the frequency characteristic of third and fourth channel input signal is changed over the preset frequency characteristic, the sound level of third and fourth channel input signal is changed over the predetermined sound level; Adder is used for first channel input signal and the mutual addition of all triple-track input signals, second channel input signal and the mutual addition of all falling tone road input signals; And replay device, be used for output signal with adder as sound reproduction from virtual sound source.This deferred mount and processing unit can comprise the low pass filter that is used to change frequency characteristic.
This device can further comprise conversion equipment, is used for changing at least one of the time of delay of deferred mount, the time of delay of multilevel delay device and sound level of time of delay, frequency characteristic and processing unit.
This device can further comprise checkout gear, be used for detecting at least one of position, direction and motion of listener, position, direction and motion that this conversion equipment response is detected change one of the time of delay of deferred mount, the time of delay of multilevel delay device and sound level of time of delay, frequency characteristic and processing unit at least.
The accompanying drawing statement
When Fig. 1 illustrates via the speaker playback voice signal from the loud speaker to listener a left side and the transmission characteristic of auris dextra;
Fig. 2 is the block diagram of conventional Headphone reproducing apparatus;
Fig. 3 is the block diagram of general FIR type digital filter (convolutional calculation device);
Fig. 4 is the block diagram according to earphone deflector equipment first embodiment of the present invention;
Fig. 5 is the block diagram according to Headphone reproducing apparatus second embodiment of the present invention;
Fig. 6 is the block diagram according to Headphone reproducing apparatus the 3rd embodiment of the present invention;
Fig. 7 A and 7B graphic representation listeners head move in the horizontal direction the situation at θ angle.
Embodiment
The preferred embodiments of the present invention are described below with reference to the accompanying drawings.
Fig. 4 illustrates first embodiment according to Headphone reproducing apparatus of the present invention.Among Fig. 4, Headphone reproducing apparatus 10 has a directional filter 12, is used for synthetic transmission characteristic.Directional filter 12 imitation is included in the virtual sound source that is present in the Virtual Space from the hypothesis sound component to the tansfer function of a listener left side and auris dextra.And this directional filter 12 is synthetic with a left side that separates from the input signal that applies via input 11 and right-channel signals with sense of direction (transmission characteristic).
This sound sound component will be described below, for example time component, frequency component and acoustic pressure component.
(1) time component (arriving the time difference of listener's two ears from sound source)
The time component is a sound component of tansfer function, it is to be caused by the time difference that sound arrives between listener's two ears, that is, from sound source arrive listener's two ears range difference caused.Therefore, postpone according to the angle and distance employing reasonable time of virtual sound source with respect to the listener.Time component that is adopted and input signal are synthetic.For example, for listener's two ears, and compare to the transmission characteristic of ear nearby from same virtual sound source, the transmission characteristic from this virtual sound source to the distant place ear is delayed appropriate time.
(2) frequency component (frequency characteristic of two ears is poor from the sound source to listener)
Frequency component is a sound component of tansfer function, and it is to be caused by the relation of the mutual alignment between sound source, listeners head and ear.Generally, have a kind of like this trend, promptly with from the near ear of sound source compare, the high frequency band of sound is bigger what be attenuated from sound source ear far away.Because sound arrives ear at a distance after walking around head.Therefore, the high frequency band characteristic of tansfer function is according to the angle and distance decay of virtual sound source with respect to the listener.And the frequency component of decay and input signal are synthetic.For example, with respect to a left side and auris dextra, compare to ear nearby from same virtual sound source with the high frequency characteristics of tansfer function, the high frequency characteristics of tansfer function is attenuated greatlyyer from this virtual sound source to the distant place ear.
(3) acoustic pressure component (volume level of two ears is poor from the sound source to listener)
The acoustic pressure component is a sound component of tansfer function, and it is caused by the volume level difference, is promptly caused by the range difference between sound source and the ear.Therefore, the level of transmission characteristic raises or reduction according to the angle and distance of virtual sound source with respect to the listener.And acoustic pressure component of being regulated and input signal are synthetic.For example, with respect to a left side and auris dextra, compare to ear nearby from same sound source with the volume level of transmission characteristic, the transmission characteristic volume level is reduced appropriate value from this virtual sound source to the distant place ear.
Utilize above-mentioned three sound component, the transmission characteristic from virtual sound source to a left side and auris dextra is synthetic with the input signal that separates on an earphone left side and right side.Therefore, in every side of earphone, Headphone reproducing apparatus 10 comprises delay circuit, is used to imitate the time component of transmission characteristic, and the frequency characteristic varying circuit is used to imitate frequency component and acoustic pressure varying circuit, is used to imitate the acoustic pressure component.
For example, utilize digital signal processing circuit to make these circuit, utilize have two delay circuit 13R and 13L, the directional filter 12 of two low pass filter (LPF) 14R and 14L and two multiplier 15R and 15L can form these circuit at an easy rate.In addition, can with one on a small scale IIR (infinite impulse response) the type digital filter of hardware as low pass filter.
Among Fig. 4, monophonic input signal is applied to directional filter 12 via input 11, is divided into left channel signals and right-channel signals then respectively.Here omit the how separately explanation of input signal.
In directional filter 12, delay circuit 13L, LPF 14L and multiplier 15L series connection are L channel.In addition, delay circuit 13R, LPF 14R and multiplier 15R series connection is R channel.
Respectively a left side and right-channel signals are postponed scheduled delay by delay circuit 13L and 13R.The frequency characteristic that will be delayed signal by LPF 14L and 14R respectively changes over the preset frequency characteristic.In addition, the sound channel signal that will be delayed and change respectively by multiplier 15L and 15R further changes to predetermined volume level.Two input signals delayed and frequency and level translation send to the L channel 16L and the R channel 16R of earphone 16 respectively.
In this circuit arrangement, series connection delay circuit 13L, LPF 14L and multiplier 15L, and also have the order of 13R, 14R and 15R not to be only limited to shown in the figure, and as long as two series circuits are divided into the right side and L channel.In addition, just as already explained, determine the processing costs (time of delay, frequency characteristic and volume level) of corresponding signal according to the relation of the position between virtual sound source and the listener.In addition, when the forward coefficient that is used as LPF 14L and 14R and digital filter when IIR type digital filter is prescribed, then can imitates the acoustic pressure component of two sound channels, and not use any special multiplier.
As mentioned above, this signal can be used as sound with sense of direction from virtual sound source (being positioned at outside the listeners head) via earphone 16 to a listener left side and auris dextra playback.
Therefore, when using according to Headphone reproducing apparatus 10 of the present invention, the listener can feel that he seems to listen to this sound from the direction that is positioned at the virtual sound source outside its head.In other words, because sound source can be positioned at the position away from listeners head, or owing to can reach the effect that imaginary loudspeaker sound is reset, the listener can appreciate playback sound for a long time and not feel very tired.
In addition, in Headphone reproducing apparatus according to the present invention, by having delay circuit
The directional filter 12 of 13L and 13R, LPF 14L and 14R and multiplier 15L and 15R can make transmission characteristic and input signal synthesize.Can be in real time that transmission characteristic (more approximate actual tansfer function) and input signal is synthetic.In addition, compare, utilize the small-scale hardware of simple composed component can constitute according to Headphone reproducing apparatus of the present invention with the conventional equipment of carrying out the impulse response convolutional calculation.
Below with reference to second embodiment of Fig. 5 description according to Headphone reproducing apparatus of the present invention.
In the actual sensation of acoustic image or sound source, except that sound source arrives the influence of the range difference between listener's two ears, the influence that also exists some indoor reflected sounds of sound source place and echo.In addition, also can distinguish sound source position according to the relativeness between indoor sound and indoor size and the indoor sound by judging room-size by rule of thumb.
In other words, indoor reflection sound has a significant impact identification of sound source.Therefore, under the situation of the sound localization of the head extra by earphone, reflected sound has a significant impact identification of sound source.When providing some sense of direction to reflected sound, the listener can more easily discern sound source.
Therefore, in a second embodiment, suppose that virtual sound source is in and has the indoor of the characteristic that echoes, Headphone reproducing apparatus 20 has the direct sound of sense of direction except that resetting to listener's two ears from virtual sound source, also the reflected sound of resetting and having sense of direction to listener's two ears from each virtual wall.
Among Fig. 5, the monophonic input signal that applies via input 21 is divided into two signals.One of two signals that separate are delivered to T time of delay
0Directional filter 12 (T
0), and output to a left side and auris dextra in the mode identical with the situation of first embodiment as the direct sound wave with sense of direction.
In two signals that separate another delivered to delay circuit 22, and (be (T time of delay as the multilevel delay signal then
1To T
N) output.This multilevel delay signal is applied to directional filter 12 (T respectively
1) to 12 (T
N), output to a left side and auris dextra respectively as reflected sound then with sense of direction.
Herein, each directional filter 12 (T
0) to 12 (T
N) corresponding with the directional filter 12 among Fig. 4.In addition, determine each signal processing value (time of delay, frequency characteristic and volume level) of these directional filters according to each direction of reflected sound.In addition, by adder 24
1To 24
NFor each a left side and R channel with direct sound wave and reflected sound mutual superposition, deliver to the L channel 16L and the R channel 16R of earphone 16 then respectively.
Therefore, can from virtual sound source left with reset direct sound wave with sense of direction and of auris dextra from the reflected sound of wall reflection.In other words, acoustic image can be positioned in outside the listeners head (rather than with auditory localization within listeners head), so, make the listener sound that this sound is well as if on the thronely send in the indoor sound source with the characteristic that echoes.In addition, owing to utilize the simple components identical can realize directional filter 12 (T with the directional filter 12 of Fig. 4
0) and 12 (T
1) to 12 (T
N), hardware can constitute this device so utilize on a small scale.
Compare with the Headphone reproducing apparatus of disclosed prior art among the above-mentioned patent application No.3 (1991)-250899, provide following properties according to the Headphone reproducing apparatus of second embodiment of the invention:
Directional filter 12 (T
0) with the transmission characteristic between virtual sound source and a listener left side and the auris dextra respectively with synthetic by separating a left side and right-channel signals that input signal obtains.
On the other hand, directional filter 12 (T
1) to 12 (T
N) will arrive a listener left side and auris dextra reflected sound corresponding transmission characteristic with by separate by delay circuit 22 export each reflected signal obtained that each left and right-channel signals is synthesized.
Adder 24
1With directional filter 12 (T
0) a left side and right-channel signals output be added to directional filter 12 (T respectively
1) a left side and right-channel signals output.Next, adder 24
2With adder 24
1A left side and right-channel signals output be added to directional filter 12 (T respectively
2) a left side and right-channel signals output.This add operation process lasts till directional filter 12 (T
N).And, adder 24
NA left side and the right-channel signals output L channel 16L and the R channel 16R that are sent to earphone 16 respectively.
In other words, can synthesize from the single virtual sound source to a left side and the sense of direction of right two ears, and, can be synthesized to the different directions sense of left and right two ears at the reflected sound of all directions.Therefore, except that obtaining to make the listener to seem in interior space sound field, to listen to the acoustic image location sense of extra head true to nature of sound, can also obtain virtual sound source sense of direction clearly such as reality.
In addition, be under the situation of stereophonic signal at input signal (being sound source), for each sound channel of stereo input signal constitutes aforesaid Headphone reproducing apparatus, so that carry out similar signal processing respectively.In this case, can be synthetic direct sound wave and the reflected sound that has sense of direction respectively of each sound channel, and synthetic acoustical signal is sent to earphone.Therefore, can under the condition of graceful stereo perception, two acoustic image be positioned at outside the listeners head.
In addition, under the situation of a plurality of (three or more) varying input signal sound channel, the above-mentioned Headphone reproducing apparatus that provides by each sound channel for input signal can be positioned at the acoustic image of each sound channel of input signal outside the listeners head.
In addition, also primary signal (unprocessed) can be joined treated signal, and added signal is sent to earphone.In the method, can change acoustic image location sense according to the difference in the signal volume level between undressed signal and this processing signals.
In addition, can freely change the sense of acoustic image location by suitably changing the corresponding signal process value.This acoustic image location sense comprises the position of virtual sound source, the form or the situations such as room shape and size in room, virtual sound source place.And reformed signal processing value is directional filter 12 (T
0) to 12 (T
N) and the value of delay circuit 22.
In this case, reformed signal processing value (time of delay, frequency characteristic and volume level) is many more, and the sense of acoustic image location then changes accurately more.On the other hand, the quantity of reformed signal processing value is few more, and it is big more that this apparatus structure can be simplified degree.In addition, when the signal processing value is progressively changed, can obtain to seem that acoustic image is in mobile such effect.
Below with reference to Fig. 6 the third embodiment of the present invention is described, wherein with Fig. 5 in like with identical function of the situation of Headphone reproducing apparatus 20 keep identical reference number.
Headphone reproducing apparatus 30 has head movement detector 31 and controller 32.Head movement detector 31 detects the motion of the listeners head that wears earphone 16; Be head rotation direction, head rotation angle etc.Detected value is sent to controller (being CPU) 32.In addition, also can be by the motion of controller 32 calculating listeners head.
Controller 32 is according to the motion of listeners head, changes delay circuit 22 and directional filter 12 (T with the opposite direction of the listeners head direction of motion with the mode that same movement speed moves acoustic image
0) to 12 (T
N) the signal processing value.
Head movement detector 31 is provided with as follows: two ultrasonic sensors are configured in a left side and the right both sides of earphone 16, and a detection signal oscillator configuration is in the precalculated position of leaving listeners head.This oscillator sends to two ultrasonic sensors in controlled timing and detects pulse signal.When receiving this detection pulse signal, left and right ultrasonic sensor is to controller 32 output signals detection time.Each, when each transducer of signal indication received this detection pulse signal detection time.Receive the detection pulse signal that sends signal and receive detection time during signal from oscillator from transducer, controller 32 detected in the time difference of detecting between pulse signal transmission and the reception, so that detect the left side of this oscillator and earphone and two distances between the right side, or detect the range difference between this oscillator and an earphone left side and the right side respectively.This controller calculates the head rotation angle according to distance that detects or range difference then.
In addition, can be by detect the three-dimensional motion direction of listeners head at additional sensor of the another location (for example top) of earphone 16 configuration.In addition, can adopt infrared sensor, rotary sensor, gravity sensor, be used to detect angle of inclination with respect to vertical direction etc. as motion detector 31.
Controller 32 changes delay circuit 22 and directional filter 12 (T according to the head rotation angle of calculating
0) to 12 (T
N) the signal processing value of delay circuit, LFP and multiplier.Specifically, controller changes the value that rotation direction in the memory that signal processing value and set basis be stored in controller 32 in advance and rotational angle are determined according to calculation expression.Move acoustic image with the opposite direction of head rotation direction with the rotational angle of identical head movement according to the head rotation angle of being calculated.
Fig. 7 A and 7B illustrate the situation that listeners head moves in the horizontal direction the θ angle.In Fig. 7, virtual sound source is positioned at the A point with respect to the listener 33 who wears earphone 16.
Herein, shown in Fig. 7 B, when listeners head moved in the horizontal direction angle θ, under the situation of conventional equipment, the location A point of virtual sound source moved to the B point according to head movement.
Yet, according to the present invention, under device 30 situation, the anchor point A of virtual sound source with the opposite direction of the direction of motion of listeners head from B point (that is the horizontal direction on the left of the B point) move angle θ.Therefore, it is constant the anchor point A of virtual sound source can be remained on the A point.
In other words, even listener 33 moves its head, the position location of the super head of virtual sound source remains unchanged, thereby can realize acoustic image location sense true to nature.Therefore, can obtain the acoustic image location sense of super head more true to nature.
In addition, except that the listeners head motion, but use location, direction and motion detector detect position, direction and the motion of listener's health with respect to virtual sound source.In this case, owing to can change the sense of acoustic image location, can obtain the acoustic image location sense of super head more true to nature according to listener positions, direction and motion.
As position, direction and motion sensor, can be in the space at listener place with three or more detection signal oscillator configuration.In addition, when four or more oscillators are configured on the different mutually planes, can detect listener's three-dimensional position, direction and motion.In this case, two receivers are configured in a left side and the right both sides of listeners head (or earphone).And, can detect of position, direction and the motion of listener's health by processor with respect to virtual sound source.
Processor calculates respective receiver position (listener positions) according to the position (coordinate) of detection signal oscillator, the time that each detection signal is sent by the corresponding detection signals oscillator, and respective receiver receives the time of each detection signal.Then, the vector in this processor acquisition receiver, expression are by rotating the vector in the receiver vector of listener's direction of 90 degree acquisitions, the vector from listener's (each mid point between the corresponding receiver) to virtual sound source.And processor obtains angle between listener and the virtual sound source according to corresponding receiver or direction vector and listener's (each mid point between the corresponding receiver) to the inner product of the vector that is calculated between the vector between virtual sound source.
When using above-mentioned position, direction and motion detector, can be easily and detect position, direction and the motion of listener exactly with respect to virtual sound source.Therefore, can change delay circuit 32, directional filter 12 (T by controller 32 positions, direction and motion according to the listener who is detected
0) to 12 (T
N) the signal processing value.Thereby can change the sense of acoustic image location more realistically with respect to position, direction and the motion of virtual sound source according to the listener.
As mentioned above, in Headphone reproducing apparatus according to the present invention, the transmission characteristic (sense of direction) of a left side and auris dextra can be synthetic with input signal from the virtual sound source to listener.Therefore can realize the effect of imaginary speaker playback sound, and further acoustic image is positioned at outside the listeners head.
In addition, can constitute like this, so that be added into input signal respectively with the synthetic reflected sound of transmission characteristic (sense of direction) according to Headphone reproducing apparatus of the present invention.Therefore, can realize that sound is sounded as if the effect of the imaginary speaker playback sound from room, thereby more clearly acoustic image is positioned at outside the listeners head with the effect that echoes.
In addition, according to the present invention shown in Figure 6, utilize directional filter 12 (T
0) (transmission characteristic synthesizer) and directional filter 12 (T
1) to 12 (T
N) (reflected sound transmission characteristic synthesizer) can synthesize this transmission characteristic.As shown in Figure 4, each directional filter has delay circuit 13R and 13L, LFP (frequency characteristic converting means) 14R and 14L and multiplier (sound volume converting device) 15R and 15L.Except that hardware size is little, can synthesize this transmission characteristic more realistically.
In addition, as the delay circuit 22, the directional filter 12 (T that change as shown in Figure 6
0) to 12 (T
N) in the signal processing value time, except that the simplification device structure, can realize various sound fields.In addition, also can obtain to seem the effect that acoustic image is moving.
In addition, the present invention can be provided for detecting listener positions, direction and detection of motion device, so that according to detected value change delay circuit 22, directional filter 12 (T as shown in Figure 6
0) to 12 (T
N) processing costs.In this case, though since the listener to move the position location that also can keep being in the virtual sound source outside the head constant.Therefore can reach the acoustic image location sense of extra head more true to nature the time.
Claims (6)
1. one kind is used to produce virtual device, makes the listener feel that sound seems that this device comprises with imagining from the virtual sound source that is present in away from listener's a space:
Deferred mount is used for the first sound channel input audio signal and the second sound channel input audio signal are postponed scheduled delay;
The frequency characteristic modifier is used for converting the frequency characteristic of the first and second sound channel input audio signals to the preset frequency characteristic;
Multiplier is used for converting the sound level of the first and second sound channel input audio signals to the predetermined sound level, and this deferred mount and frequency characteristic conversion equipment and multiplier are cascaded mutually; With
Replay device, first and second channel input signals that are used for being handled by deferred mount and frequency characteristic conversion equipment and multiplier are as the sound reproduction from virtual sound source.
2. device according to claim 1, wherein the frequency characteristic conversion equipment comprises a low pass filter.
3. the audio signal according to input produces the device of virtual sound, makes the listener feel that sound seems to be present in a virtual sound source away from this listener from imagination ground, and this device comprises:
Deferred mount, be used for first channel input signal and the second channel input signal delay scheduled time that will separate with input audio signal, the frequency characteristic of first and second channel input signals is changed over the preset frequency characteristic, the sound level of first and second channel input signals is changed over the predetermined sound level;
The multilevel delay device is used for a plurality of scheduled delays of another signal delay that will separate with this input audio signal, with output multilevel delay signal;
Processing unit, be used for a plurality of triple-track input signals and a plurality of falling tones road input signal are postponed a plurality of scheduled times, third and fourth channel input signal separates with the multilevel delay signal, the frequency characteristic of third and fourth channel input signal is changed over the preset frequency characteristic, the sound level of third and fourth channel input signal is changed over the predetermined sound level;
Adder is used for first channel input signal and the mutual addition of all triple-track input signals, second channel input signal and the mutual addition of all falling tone road input signals; With
Replay device is used for output signal with adder as the sound reproduction from virtual sound source.
4. device according to claim 3, wherein deferred mount and processing unit comprise a low pass filter that is used to change frequency characteristic.
5. device according to claim 3 further comprises conversion equipment, is used for changing at least one of the time of delay of deferred mount, the time of delay of multilevel delay device and time of delay, frequency characteristic and sound level of processing unit.
6. device according to claim 5, further comprise checkout gear, be used for detecting at least one of position, direction and motion of listener, position, direction and motion that this conversion equipment response is detected change one of the time of delay of deferred mount, the time of delay of multilevel delay device and time of delay, frequency characteristic and sound level of processing unit at least.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP148323/1995 | 1995-05-22 | ||
| JP7148323A JP2900985B2 (en) | 1994-05-31 | 1995-05-22 | Headphone playback device |
| JP148323/95 | 1995-05-22 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1140968A CN1140968A (en) | 1997-01-22 |
| CN1108083C true CN1108083C (en) | 2003-05-07 |
Family
ID=15450221
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN96108997.0A Expired - Lifetime CN1108083C (en) | 1995-05-22 | 1996-05-22 | Headphone reproducing apparatus |
Country Status (5)
| Country | Link |
|---|---|
| EP (1) | EP0744881B1 (en) |
| CN (1) | CN1108083C (en) |
| DE (1) | DE69632889T2 (en) |
| MY (1) | MY124476A (en) |
| SG (1) | SG89238A1 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105307086A (en) * | 2015-11-18 | 2016-02-03 | 王宋伟 | Method and system for simulating surround sound for two-channel headset |
| CN109640226A (en) * | 2018-11-10 | 2019-04-16 | 东莞市华睿电子科技有限公司 | A kind of earpiece audio is converted into the control method of Virtual Sound |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TW410527B (en) * | 1998-01-08 | 2000-11-01 | Sanyo Electric Co | Stereo sound processing device |
| US8023659B2 (en) | 2005-06-21 | 2011-09-20 | Japan Science And Technology Agency | Mixing system, method and program |
| WO2013076534A1 (en) * | 2011-11-21 | 2013-05-30 | Sony Ericsson Mobile Communications Ab | Determining direction of a display associated with an earphone set |
| TWI498014B (en) * | 2012-07-11 | 2015-08-21 | Univ Nat Cheng Kung | Method for generating optimal sound field using speakers |
| CN106714017B (en) * | 2015-07-17 | 2019-08-23 | 中兴通讯股份有限公司 | A kind of method, apparatus, terminal and earphone adjusting earphone sound field |
| CN105578355B (en) * | 2015-12-23 | 2019-02-26 | 惠州Tcl移动通信有限公司 | A kind of method and system enhancing virtual reality glasses audio |
| CN110740415B (en) * | 2018-07-20 | 2022-04-26 | 宏碁股份有限公司 | Sound effect output device, arithmetic device and sound effect control method thereof |
| CN112437385A (en) * | 2020-11-19 | 2021-03-02 | 袁志钢 | Earphone set |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5175429A (en) * | 1974-12-25 | 1976-06-30 | Matsushita Electric Ind Co Ltd | |
| JPS58198999A (en) * | 1982-05-17 | 1983-11-19 | Matsushita Electric Ind Co Ltd | Sound image controller |
| GB2220818A (en) * | 1988-07-15 | 1990-01-17 | Gary Keith Henry | Stereo systems |
| GB8900330D0 (en) * | 1989-01-07 | 1990-04-25 | British Aerospace | Binaural display apparatus |
| JPH02219400A (en) * | 1989-02-20 | 1990-08-31 | Sanyo Electric Co Ltd | Stereophonic sound reproducing device |
| DE69132430T2 (en) * | 1990-01-19 | 2001-04-05 | Sony Corp | Device for reproducing audio signals |
| WO1993026085A1 (en) * | 1992-06-05 | 1993-12-23 | Noise Cancellation Technologies | Active/passive headset with speech filter |
| JPH0682242A (en) * | 1992-08-31 | 1994-03-22 | Victor Co Of Japan Ltd | Three-dimensional position/attitude detection method |
-
1996
- 1996-05-21 EP EP96303604A patent/EP0744881B1/en not_active Expired - Lifetime
- 1996-05-21 DE DE69632889T patent/DE69632889T2/en not_active Expired - Fee Related
- 1996-05-22 CN CN96108997.0A patent/CN1108083C/en not_active Expired - Lifetime
- 1996-05-22 MY MYPI96001922A patent/MY124476A/en unknown
- 1996-05-22 SG SG9609852A patent/SG89238A1/en unknown
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105307086A (en) * | 2015-11-18 | 2016-02-03 | 王宋伟 | Method and system for simulating surround sound for two-channel headset |
| CN109640226A (en) * | 2018-11-10 | 2019-04-16 | 东莞市华睿电子科技有限公司 | A kind of earpiece audio is converted into the control method of Virtual Sound |
Also Published As
| Publication number | Publication date |
|---|---|
| DE69632889D1 (en) | 2004-08-19 |
| SG89238A1 (en) | 2002-06-18 |
| MY124476A (en) | 2006-06-30 |
| EP0744881A3 (en) | 1999-06-09 |
| CN1140968A (en) | 1997-01-22 |
| DE69632889T2 (en) | 2005-07-21 |
| EP0744881A2 (en) | 1996-11-27 |
| EP0744881B1 (en) | 2004-07-14 |
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