JPH08126098A - Sound image moving device - Google Patents

Abstract

PURPOSE: To move a sound images of plural sounds to an optional position simultaneously with simple system configuration. CONSTITUTION: Three sound signals are received from input terminals 1-1, 1-2, 1-3 and branched receiver into two ways, one signal is given to sound volume adjustment circuits 18-1, 19-1, 20-1 and the other signals are given to sound volume adjustment circuits 18-2, 19-2, 20-2. Coordinate input circuits 21-1, 21-2, 21-3 input sequentially spatial coordinates of the sound signals corresponding to the sound signals given to the input terminals 1-1, 1-2, 1-3 to control the sound adjustment circuits 18-1, 18-2 corresponding to the coordinates. The sound volume adjustment circuits 18-1, 18-2, 19-1, 19-2, 20-1, 20-2 adjust the sound volume of the received signals according to the command of the coordinate input circuits 21-1, 21-2, 21-3 and the result is given to adders 22-1, 22-2, 22-3, in which they are added. Output signals from the adders 22-1, 22-2 are given to FIR filters 2-1, 3-1, 2-2, 3-2, in which convolution processing is conducted and output signals are added by an adder 23-1 and sounded from speakers 7, 8.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sound image moving device for reproducing realistic sound in AV (audio / visual) equipment.

[0002]

2. Description of the Related Art In recent years, in the fields of video and audio, there is a demand for realistic sound reproduction used in game machines, and it is necessary to develop hardware corresponding thereto.

A conventional sound image moving device will be described below with reference to the drawings. FIG. 4 is a hardware block diagram showing a configuration of a conventional sound image moving device. In FIG. 4, 1 is an input terminal for inputting a signal, S (t) is an input signal (shows a continuous function of time t, and so on), 2 and 3
Is a FIR filter that performs convolution operation, and hL (t) and hR (t) are F
The impulse responses 4 of the IR filters 2 and 3 are virtual sound images (sound signals radiated from an actual speaker and localized at the position of that speaker are called real sound images. (Refers to a sound image localized at a position different from the position of the speaker) of the coordinate input device 5 for inputting spatial position coordinates
A storage circuit that stores impulse response data to be set in the R filters 2 and 3, and 6 reads impulse response data corresponding to the coordinates designated by the coordinate input device 4 from the storage circuit 5 and uses them in the FIR filters 2 and 3. Setting circuit to set,
Reference numerals 7 and 8 denote speakers that emit sound to the outside, and 9 is a listener.

The operation of the conventional sound image moving device configured as described above will be described with reference to the drawings.

The signal S (t) input to the input terminal 1 is
It is input to the filters 2 and 3 and the following calculation is performed. The impulse responses hL (t), hR (t) and the signal S (t) are considered as digital signals whose time is discrete, and are converted as in (Equation 1) (Equation 2) (Equation 3).

[0006]

[Equation 1]

[0007]

[Equation 2]

[0008]

(Equation 3)

However, n is a natural number and N is the length of the impulse responses hL (n) and hR (n). Then, the following equation is calculated.

[0010]

[Equation 4]

[0011]

(Equation 5)

Here, the natural number n should actually be expressed by nT, and T represents the sampling time, but in general, T is omitted and expressed as (Equation 4) and (Equation 5). The signals thus obtained are radiated from the speakers 7 and 8.

The impulse response data hL (t), hR (t) set in the FIR filters 2 and 3 are set as follows.

First, the spatial position of the virtual sound image (for example, x and y on the rectangular coordinates) is input by the coordinate input device 4, and this position is instructed to the setting circuit 6. Then, the setting circuit 6 reads the impulse response data corresponding to the designated position of the virtual sound source from the storage circuit 5 and sets it in the FIR filters 2 and 3.

Here, a method for localizing a virtual sound image in an arbitrary direction will be described with reference to FIG. FIG. 5 virtually generates a sound image localization equivalent to the case where a signal is reproduced from the speaker 10 provided on the left side using the speaker 8 of the left channel and the speaker 7 of the right channel (that is, a virtual sound image is created). ) It is a principle diagram. In the figure, the speakers 7 and 8 are arranged in front of the listener 9 on the left and right sides. Then, the input signal S (t) is input to the arithmetic circuits 11 and 12. The arithmetic circuits 11 and 12 are FIR filters that perform convolutional operations on the input signals with impulse responses hLR (t) and hLL (t), respectively. The h1 (t) shown in the figure is the impulse response at the position of the left ear of the speaker 8 and the listener 9 (accurately, the position of the eardrum, which is the position of the ear canal when measuring is performed). Similarly, h2 (t) is the impulse response at the position of the speaker 8 and the right ear of the listener 9, h3 (t) is the impulse response at the position of the speaker 7 and the left ear of the listener 9, and h4 (t) is the speaker 7 And the impulse response at the position of the listener 9's right ear, h5 (t) is the impulse response at the position of the speaker 10 and the listener's 9 left ear, and h6 (t) is at the position of the speaker 10 and the listener's 9 right ear. It is an impulse response.

In such a structure, when the signal S (t) is output from the speaker 10, the sound reaching the ear of the listener 9 is as follows.

That is, the sound pressure L (t) in the left ear is expressed by (Equation 6).

[0018]

(Equation 6)

The sound pressure R (t) in the right ear is expressed by (Equation 7).

[0020]

(Equation 7)

However, * represents a convolution operation. In reality, the transfer function of the speaker itself is multiplied, but this is ignored, and it may be considered that the transfer function of the speaker is included.

Further, the sound pressure, the impulse response and the signal S (t) of (Equation 6) and (Equation 7) are considered as digital signals whose time is discrete, and they are (Equation 8) (Equation 9) (Equation 10) (Equation 9) Conversion is performed as shown in Expression 11).

[0023]

(Equation 8)

[0024]

[Equation 9]

[0025]

[Equation 10]

[0026]

[Equation 11]

In this case, (Equation 6) and (Equation 7) are the following (Equation 1)
2) It becomes like (Equation 13).

[0028]

(Equation 12)

[0029]

(Equation 13)

Similarly, the signal S (t) is changed to the loudspeakers 7 and 8
The following (Equation 14) and (Equation 15) are established for the sound radiated from and reaching the listener 9. That is, the sound pressure of the left ear becomes the following (Equation 14).

[0031]

[Equation 14]

The sound pressure of the right ear is as follows (Equation 15).

[0033]

(Equation 15)

If it is assumed that the sound can be heard from the same direction if the head related transfer functions are equal (this assumption is generally correct), the following (Equation 16) to (Equation 19) are established.

[0035]

[Equation 16]

[0036]

[Equation 17]

[0037]

(Equation 18)

[0038]

[Formula 19]

Therefore, the impulse responses hLL (n) and hLR (n) may be determined so that (Equation 17) and (Equation 19) are established.

For example, impulse responses h1 (n) to h6 (n), hL
Rewriting L (n) to hLR (n) in the frequency domain expression gives the following (Equation 20) to (Equation 27).

[0041]

(Equation 20)

[0042]

[Equation 21]

[0043]

[Equation 22]

[0044]

(Equation 23)

[0045]

[Equation 24]

[0046]

(Equation 25)

[0047]

(Equation 26)

[0048]

[Equation 27]

However, FFT () represents a Fourier transformed (FFT) function. Next, rewriting (Equation 17) and (Equation 19) in the frequency domain expression, the following (Equation 28) (Equation 29)
As described above, the convolution operation is changed to multiplication, and after that, each impulse response becomes a transfer function obtained by Fourier transform.

[0050]

[Equation 28]

[0051]

[Equation 29]

In (Equation 28) and (Equation 29), the transfer function
Since values other than HLL (n) and HLR (n) are obtained by measurement, the transfer function HL
L (n) and HLR (n) can be obtained.

[0053]

[Equation 30]

[0054]

[Equation 31]

HLL (n) and HLR (n) thus determined
Inverse Fourier transform (IFFT) of hLL (n) and hLR (n) is used to provide the signal S (n) to the arithmetic circuits 11 and 12, and the signal output from the speaker 8 is represented by hLL (n). , The signal output from the speaker 7 is convolved with hLR (n) and the signal is emitted so that the listener 9 actually hears the speaker 1 on the left side.
Even if you don't sound 0, you can feel that sound is coming from that direction.

As described above, a sound image can be virtually localized in an arbitrary direction by obtaining impulse responses in all directions in advance and setting them in the arithmetic circuits 11 and 12.

For example, a target speaker is installed in the entire circumferential direction of the listener 9, and impulse response data for creating a virtual sound image in the entire circumferential direction is obtained by the two front speakers as described above, and the storage circuit 5 is obtained. By storing the data in the FIR filters 2 and 3 sequentially and setting the impulse response data corresponding to the position input from the coordinate input device 4 by the setting circuit 5, a virtual sound image can be created in any direction, Spatial sound image movement becomes possible.

Next, FIG. 6 shows the basic structure of the FIR filter for performing the convolution operation. In the figure, 13 is an input terminal for inputting a signal, 14 is a delay element for delaying the signal by τ, 15 is a multiplier for multiplying a value called a tap coefficient represented by h (n) by the input signal, and 16 is An adder for adding input signals, and 17 is an output terminal for outputting signals. Generally, such an FIR filter is a DSP that performs high-speed multiplication and addition.
(Digital Signal processor) or a dedicated LSI is used.

In the multiplier 15, the impulse response h (n) (n: 0 to N-1, where N is the required impulse response length) is set as a tap coefficient as shown in FIG. Also, the delay element 1
In 4, the delay time corresponding to the sampling frequency when converting the analog signal to the digital signal is set. Then, by repeating multiplication and addition and delay with respect to the signal input to the input terminal 13, (Equation 12) (Equation 13)
Execute the convolution operation as shown in. Since the signal processing is performed with a digital signal, an A / D that actually converts the analog signal into a digital signal before this FIR filter is used.
A converter and a D / A converter for converting a digital signal into an analog signal are necessary after the converter, but they are omitted in the figure (the same applies hereinafter).

[0060]

However, in the above-mentioned configuration, at least two FIR filters are required for one input sound signal. For example, when two sounds are processed simultaneously, four FIR filters are required. When processing three sounds at the same time, six FIR filters are required. In other words, there is a problem that a FIR filter that is twice as large as the control sound is required, and the circuit scale becomes large when controlling a plurality of sounds at the same time.

An object of the present invention is to solve the conventional problems as described above, and with a simple system configuration in which an increase in circuit scale is suppressed, a sound image capable of simultaneously moving sound images with respect to a plurality of input sounds. A mobile device is provided.

[0062]

In order to achieve the above object, a first aspect of the present invention is to provide an input means for inputting a plurality of sound signals, and to divide each signal input to the input means into a predetermined number. Branching means for inputting three-dimensional spatial coordinates in real time corresponding to the signal input by the inputting means, and the branching corresponding to the coordinates input by the coordinate inputting means. Volume adjusting means for adjusting the amplitude level of the output signal of the means, first mixing means for mixing the output signals of the volume adjusting means, and an imaginary sound source at a predetermined position with respect to the output signal of the first mixing means A sound image having signal processing means for performing signal processing for creating a signal, second mixing means for mixing the output signals of the signal processing means, and output means for outputting the output signal of the second mixing means to the outside. It is a mobile device.

According to a second aspect of the present invention, input means for inputting a plurality of sound signals, branching means for branching each signal input to the input means into a predetermined number, and inputting means by the input means. Coordinate storage means for storing three-dimensional spatial coordinates and reproduction time corresponding to the signal, time management means for controlling the reproduction time, corresponding to the reproduction time and the spatial coordinates stored in the coordinate storage means, Volume adjusting means for adjusting the amplitude level of the output signal of the branching means, first mixing means for mixing the output signals of the volume adjusting means, and the first
Signal processing means for performing signal processing for creating an imaginary sound source at a predetermined position with respect to the output signal of the mixing means, second mixing means for mixing the output signals of the signal processing means, and the second The sound image moving apparatus has an output unit that outputs the output signal of the mixing unit to the outside.

According to a third aspect of the present invention, input means for inputting a plurality of sound signals, branching means for branching each signal input to the input means into a predetermined number, and inputting means by the input means. Coordinate input means for inputting three-dimensional spatial coordinates in real time corresponding to the signal, coordinate storage means for storing three-dimensional spatial coordinates corresponding to the signal input by the input means, and reproduction time, and reproduction Time management means for controlling the time, and the amplitude level of the output signal of the branch means is adjusted according to the coordinates input by the coordinate input means or the reproduction time and the spatial coordinates stored in the coordinate storage means. Volume adjusting means, first mixing means for mixing the output signals of the volume adjusting means, and a signal for subjecting the output signal of the first mixing means to signal processing for creating an imaginary sound source at a predetermined position A management unit, a second mixing means for mixing an output signal of said signal processing means, a sound image device having an output means for outputting an output signal of said second mixing means to the outside.

[0065]

According to the first invention, a plurality of virtual sound images are created at predetermined positions by the signal processing means. The coordinate input means sets spatial coordinates at which the respective sounds input to the input means are localized, and the volume adjustment means is arranged so that the sound image is localized at a position corresponding to the spatial coordinates set by the coordinate input means. The volume of the output signal of the branching means for branching the sound input to the plurality of parts is adjusted. The sound whose volume is adjusted by the volume adjusting means is added by the first mixing means and input to the signal processing means. The output signals of the signal processing means are added by the second mixing means and radiated as sound to the outside by the output means.

Further, according to the second invention, a plurality of virtual sound images are created at predetermined positions by the plurality of signal processing means. The coordinate storage means stores a set of spatial coordinates and a reproduction time for localizing a sound image with respect to a signal input by the input means. The time management means manages time, and when the reproduction time stored in the coordinate storage means is reached, reads out the spatial coordinates stored in combination with the reproduction time. The volume adjusting unit adjusts the volume of the output signal of the branching unit that branches the sound input to the input unit into a plurality of pieces so that the sound image is localized at the position corresponding to the spatial coordinates read by the time management unit. The sounds whose volume is adjusted by the volume adjusting means are added by the first mixing means and input to the signal processing means. The output signals of the signal processing means are added by the second mixing means and radiated as sound to the outside by the output means.

Further, according to the third invention, a plurality of virtual sound images are created at predetermined positions by a plurality of signal processing means. The coordinate storage means stores a set of spatial coordinates and a reproduction time for localizing a sound image with respect to a signal input by the input means. The time management means manages time, and when the reproduction time stored in the coordinate storage means is reached, reads out the spatial coordinates stored in combination with the reproduction time. The volume adjusting unit adjusts the volume of the output signal of the branching unit that branches the sound input to the input unit into a plurality of pieces so that the sound image is localized at the position corresponding to the spatial coordinates read by the time management unit. Further, the coordinate input means sets spatial coordinates where the plurality of sounds input to the input means are localized, and the volume adjusting means localizes the sound image at a position corresponding to the spatial coordinates set by the coordinate input means. The volume of the output signal of the branching unit that splits the sound input to the input unit into a plurality of parts is adjusted. The sounds whose volume is adjusted by the volume adjusting means are added by the first mixing means and input to the signal processing means. The output signals of the signal processing means are added by the second mixing means and radiated as sound to the outside by the output means.

With the configuration and operation as described above, it is possible to simultaneously move sound images for a plurality of sounds with a simple system configuration.

[0069]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A sound image moving apparatus according to a first embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing the configuration of the sound image moving apparatus in the first embodiment. The parts having the same functions as those of the conventional example are designated by the same reference numerals, and detailed description thereof will be omitted.

In FIG. 1, 1-1, 1-2, 1-3 are input terminals for inputting three sound signals, 18-1, 18-2, 19-1, 19-2, 20.
-1 and 20-2 are volume control circuits that adjust the volume of three sound signals that are input to the input terminal and branched into two, 21-1, 21-2, 21
-3 is a coordinate input circuit that inputs the spatial position coordinates of the sound image for the three input sounds, 2-1, 3-1, 2-2, 3-2 are FIR filters that perform convolution, 22-1, 22-2 is an adder that adds the output signals of the volume control circuit, and 23-1 and 23-2 are adders that add the output signals of the FIR filter.

The addition outputs of the adders 23-1 and 23-2 are output to the speakers 7 and 8, respectively. Although not shown in the figure, the signals output to the speakers 7 and 8 are output to the speakers 7 and 8 via a power amplifier that amplifies the signals. Further, in FIG. 1, L'is an imaginary sound source created by the FIR filters 2-1 and 3-1 and R'is an imaginary sound source created by the FIR filters 2-2 and 3-2. With this imaginary sound source L '
The case where the sound image is localized (moved) between R'is shown.

Input terminals 1-1, 1-2, 1-3 are input means, coordinate input circuits 21-1, 21-2, 21-3 are coordinate input means, volume control circuits 18-1, 18-. 2, 19-1, 19-2, 20-1, 20-2 are volume adjusting means, adders 22-1, 22-2 are first mixing means, adder
23-1, 23-2 are the second mixing means, FIR filters 2-1, 3-1 and 2
-2 and 3-2 correspond to signal processing means and speakers 7 and 8 correspond to output means, and input terminals 1-1, 1-2 and 1- which are not shown in the figure
The part that branches the input signal after 3 corresponds to the branching means.

The operation of the sound image moving apparatus according to the first embodiment having the above configuration will be described.

First, three audio signals such as voices and music are input from the input terminals 1-1, 1-2, 1-3, and each of them is branched into two, one of which is a volume adjusting circuit 18-1, Input to 19-1, 20-1, the other signal is volume control circuit 18-2, 19-2, 20-2
Is input to The coordinate input circuit 21-1 corresponds to the sound signal input to the input terminal 1-1, sequentially inputs the spatial coordinates of this sound signal, and the coordinates are input to the volume adjusting circuits 18-1, 18- 2
Set to. Volume adjustment circuits 18-1, 18-2 are coordinate input circuit 21
Adjust the volume of the input signal (increase or decrease) according to the coordinates set from -1 and output. Similarly, the coordinate input circuit 21-2 performs control corresponding to the sound signal input to the input terminals 1-2. The coordinate input circuit 21-3 also performs control corresponding to the sound signal input to the input terminals 1-3. The operation of the volume adjusting circuits 19-1, 19-2 and 20-1, 20-2 is also the same as that of the volume adjusting circuits 18-1, 18-2.

The output signals of the volume adjusting circuits 18-1, 19-1 and 20-1 are input to the adder 22-1 and added. Similarly, the output signals of the volume adjusting circuits 18-2, 19-2, 20-2 are added in the adder 22-2.

The output signal of the adder 22-1 is the FIR filter 2-1 and
It is input to 3-1 and the convolution operation is performed. Similarly, the output signal of the adder 22-2 is input to the FIR filters 2-2 and 3-2,
A convolution operation is performed.

The output signals of the FIR filters 2-1 and 2-2 are added by the adder 2
It is added at 3-1 and emitted from the speaker 7.

Similarly, the output signals of the FIR filters 3-1 and 3-2 are added by the adder 23-2 and radiated from the speaker 8.
The FIR filters 2-1 and 3-1 are set with impulse response data for creating the imaginary sound source L ', and the sound image of the sound signal input thereto is virtually localized at the position of L'. Similarly, FIR
The filters 2-2 and 3-2 are set with impulse response data that creates an imaginary sound source R ', and the sound image of the sound signal input to this is virtually localized at the position of R' (create an imaginary sound source. The method is the same as the conventional example).

In the case of the present embodiment, the sound image is localized between the virtual sound sources L'and R'and moved, but
The method of localizing the sound image between the virtual sound sources L'and R'is the same as the stereo reproduction method using two real sound sources.
This is done by adjusting the volume of the sound output from. In other words, if you want to localize the sound image in the center of the imaginary sound sources L'and R ',
It is sufficient to radiate from the virtual sound sources L'and R'at the same volume, and the virtual sound source L '
If you want to localize to, set the volume from the imaginary sound source R'to 0. Adjusting the volume of sound emitted from an imaginary sound source means adjusting the volume of the signal that is input to the FIR filters 2-1 and 3-1 and the FIR filters 2-2 and 3-2, or output from this filter. To adjust the volume of the signal.

In this embodiment, the volume of the signal input to the FIR filters 2-1, 3-1 or 2-2, 3-2 is set for each input sound. This makes it possible to localize sound images to different positions for three sounds at the same time. In other words, the sound signal input to the input terminal 1-1 is adjusted by the volume adjusting circuit 18-1 to adjust the volume on the imaginary sound source L'side.
Adjust the volume of the virtual sound source R'side with 18-2. Similarly, input terminal
The sound signal input to 1-2 is imaginary sound source L'by the volume adjustment circuit 19-1.
Adjust the volume on the side, and adjust the volume on the imaginary sound source R'side with the volume adjustment circuit 19-2. The same applies to the case of sound signals input to the input terminals 1-3.

Further, the volume adjusting circuits 18-1, 18-2, 19-1, 19
Volume adjustment of the signal input to the FIR filters 2-1, 3-1, 2-2, 3-2 by -2, 20-1, 20-2 is performed by the coordinate input circuit described above.
It is automatically performed according to the coordinates set by 21-1, 21-2 and 21-3. As the coordinate input circuits 21-1, 21-2, 21-3, for example, a mouse or keyboard used in a personal computer (including an input pad used in a current game machine) may be used.

The sound image position and volume adjusting circuits 18-1, 18-
The volume data controlled by 2, 19-1, 19-2, 20-1, 20-2 is converted linearly by the above-mentioned principle of normal stereo reproduction (accurate data is obtained by psychological experiment etc.). There is also)
It can be calculated and calculated. Alternatively, a conversion table of sound image position and volume data may be used.

A sound image moving apparatus according to the second embodiment of the present invention will be described with reference to the drawings. FIG. 2 is a block diagram showing the configuration of the sound image moving apparatus in the second embodiment. The parts having the same functions as those of the conventional example and the first embodiment of the present invention are designated by the same reference numerals and detailed description thereof will be omitted.

In FIG. 2, 24 is a timer for generating time, 24-1 is a start switch for starting the timer 24, 24-2 is a stop switch for stopping the timer 24, and 25 is a reproduction for a signal inputted by the input means. A storage circuit that stores time and coordinate data for localizing a sound image at the reproduction time in a set. Reference numeral 26 denotes a combination with the reproduction time when the time output from the timer is equal to the reproduction time stored in the storage circuit 25. The coordinate data stored in is read and the coordinate data is stored in the volume adjustment circuit 18-
Setting circuit for setting 1, 18-2, 19-1, 19-2, 20-1, 20-2.

The timer 24 and the setting circuit 26 correspond to time management means, and the storage circuit 25 corresponds to coordinate storage means.

Regarding the operation of the sound image moving apparatus of the second embodiment thus constructed, the description of the same operation as that of the first embodiment is omitted, and only the part different from that of the first embodiment is omitted. explain.

First, the storage circuit 25 stores in advance the reproduction time of the sound and the coordinate data of the sound image position corresponding to the sound signal input to the input terminals 1-1, 1-2, 1-3. There is.

The timer 24 starts time generation by the start switch 24-1 (when the timer is stopped, an instruction is given by the stop switch 24-2). The setting circuit 26 reads the time generated from the timer 24, compares it with the reproduction time stored in the storage circuit 25,
When this is the same, the coordinate data stored as a pair with the playback time is read, and this coordinate data is read by the volume adjusting circuit 18
Set to -1, 18-2, 19-1, 19-2, 20-1, 20-2. Actually, since the reproduction time and the coordinate data stored in the storage circuit 25 need a mark to correspond to the input sound, it is possible to know which input terminal the reproduction time and the coordinate data correspond to the sound signal input. It is necessary to store various data at the same time.

For example, the reproduction time 1 corresponding to the input terminals 1-1
When the coordinate data X and Y are stored in the storage circuit 25 for 0 seconds, the timer 24 is started, and at the time of 10 seconds, the setting circuit 26 sets the coordinate data X and Y to the volume adjusting circuit 18-1, It will be set to 18-2. Of course, the memory circuit 25 may store data for simultaneously localizing the sound images of the input terminals 1-1, 1-2, and 1-3. The subsequent operation is similar to that of the first embodiment.

The sound image moving apparatus according to the third embodiment of the present invention will be described below with reference to the drawings. FIG. 3 is a block diagram showing the configuration of the sound image moving apparatus in the third embodiment. The parts having the same functions as those of the conventional example, the first embodiment, and the second embodiment are designated by the same reference numerals, and detailed description thereof will be omitted.

The operation of the sound image moving apparatus according to the third embodiment differs from that of the first and second embodiments in that the input terminal 1-
There are two coordinate input circuits 21-1, 21-2, 21-3 and a setting circuit 26 for designating the sound image positions of the sound signals input to 1, 1-2 and 1-3.

Basically, these two circuits do not specify the sound image position for the same sound at the same time, but, for example, the coordinate input circuits 21-2 and 21-3 are not used and instead stored. The circuit 25 stores the reproduction time and the coordinate data for the sounds input to the input terminals 1-2 and 1-3, and stores them in the input terminals.
The sound image position is sequentially specified in real time for the sound input to 1-1, and the sound image position is automatically set by timer management for the sound input to input terminals 1-2 and 1-3. Is specified.

In this embodiment, the position of the imaginary sound source is set to the front.
In addition to this, it was set to the position of L ', R', but in addition to this, an imaginary sound source that is located symmetrically behind the listener (FIR
By increasing the number of filters by four) and performing the same process, it is possible to move the sound image to a position in the horizontal plane. Also, by creating a virtual sound source above or below the listener, it is possible to move the sound image in the vertical direction.

[0094]

As described above, according to the sound image moving apparatus of the present invention, it is possible to simultaneously move the sound images for a plurality of input sounds with a simple system configuration which suppresses an increase in the circuit scale. .

[Brief description of drawings]

FIG. 1 is a block diagram of a sound image moving device according to a first embodiment of the present invention.

FIG. 2 is a block diagram of a sound image moving device according to a second embodiment of the present invention.

FIG. 3 is a block diagram of a sound image moving device according to a third embodiment of the present invention.

FIG. 4 is a block diagram of a conventional sound image moving device.

FIG. 5 is a block diagram illustrating the principle of sound image localization.

FIG. 6 is a diagram illustrating a configuration of a FIR filter.

[Explanation of symbols] 1-1, 1-2, 1-3 Input terminals 2-1, 3-1, 2-2, 3-2 FIR filter 7, 8 Speaker 9 Listener 18-1, 18-2, 19-1, 19-2, 20-1, 20-2 Volume adjustment circuit 21-1, 21-2, 21-3 Coordinate input circuit 22-1, 22-2 Adder 23-1, 23-2 Adder

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Takashi Katayama 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (72) Inventor, Riko Ogawa 1006 Kadoma, Kadoma City, Osaka Matsushita Electric Industrial Co., Ltd.

Claims (3)

[Claims] 1. An input means for inputting a plurality of sound signals, a branch means for branching each signal input to the input means into a predetermined number, and an input means corresponding to the signals input by the input means. Coordinate input means for inputting three-dimensional spatial coordinates by time; volume adjusting means for adjusting the amplitude level of the output signal of the branching means in accordance with the coordinates input by the coordinate input means; First mixing means for mixing the output signals of the means, signal processing means for subjecting the output signal of the first mixing means to signal processing for creating an imaginary sound source at a predetermined position, and the signal processing means A sound image moving device having second mixing means for mixing the output signals of the above and output means for outputting the output signal of the second mixing means to the outside. 2. Input means for inputting a plurality of sound signals, branching means for branching each signal input to the input means into a predetermined number, and three-dimensional corresponding to the signals input by the input means. Coordinate storage means for storing specific spatial coordinates and reproduction time, time management means for controlling the reproduction time, and output signal of the branching means corresponding to the reproduction time and spatial coordinates stored in the coordinate storage means. Volume adjusting means for adjusting the amplitude level of the sound source, first mixing means for mixing the output signals of the volume adjusting means, and for creating an imaginary sound source at a predetermined position with respect to the output signal of the first mixing means. A sound image moving device having signal processing means for performing the signal processing of 1., second mixing means for mixing the output signals of the signal processing means, and output means for outputting the output signal of the second mixing means to the outside. 3. Input means for inputting a plurality of sound signals, branching means for branching each signal input to the input means into a predetermined number, and real time corresponding to the signals input by the input means. Coordinate input means for inputting three-dimensional spatial coordinates, coordinate storage means for storing three-dimensional spatial coordinates and reproduction time corresponding to the signal input by the input means, and time management for controlling the reproduction time. Means for adjusting the amplitude level of the output signal of the branching means in accordance with the coordinates input by the coordinate input means or the reproduction time and the spatial coordinates stored in the coordinate storage means, First mixing means for mixing the output signals of the volume adjusting means, signal processing means for subjecting the output signals of the first mixing means to signal processing for creating an imaginary sound source at a predetermined position, and the signal Sound image device having a second mixing means for mixing the output signal of the sense means, an output means for outputting an output signal of said second mixing means to the outside.