JP3201478B2 - Sound image localization device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a sound image localization apparatus capable of localizing generated musical sounds at random.

(B) Conventional Techniques Currently, there are electronic musical instruments and the like in which a plurality of output channels, such as two channels and four channels, for outputting one musical tone are provided so that a musical tone to be emitted can be localized. In such a device, the localization position of the sound image has been determined by the player inputting a parameter for determining the localization or based on a parameter generated by a built-in function circuit.

(C) Problems to be Solved by the Invention However, in the parameter setting method as described above, the position to be localized is fixed to the position set by the player or moves regularly based on the parameters generated by the function circuit. However, there was a disadvantage that the listener could not expect a change in localization other than a surprise of the listener.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a sound image localization device that realizes other localizations by obtaining parameters for sound image localization from random numbers.

(D) Means for Solving the Problems According to the invention of claim 1, the sound image of each tone output by each of the plurality of tone generators capable of independently generating a tone is converted into a parameter for specifying a sound image localization position two-dimensionally. A plurality of sound image localization means independently localized based on the plurality of sound image localization means, and a random number corresponding to each of the plurality of sound image localization means is independently generated, and the generated random number is supplied to the corresponding sound image localization means as the parameter. Generating means.

According to a second aspect of the present invention, first and second sound image localization means for independently localizing the sound image of one input tone based on a parameter for two-dimensionally specifying the sound image localization position, First and second random number generating means for supplying the generated random number as the parameter to the first and second sound image localization means, respectively, and a musical tone output by the second sound image localization means. A delay effect imparting means for imparting a delay effect to the sound signal, and an output means for mixing and outputting the musical tone output by the first sound image localization means and the musical tone output by the delay effect imparting means. Features.

(E) Operation The sound image localization apparatus according to claim 1 is configured such that the tone images of each tone output by a plurality of tone generators each capable of independently generating a tone are individually determined based on a parameter that two-dimensionally designates a sound image localization position. And a plurality of sound image localization means, and each sound image localization means is supplied with an independently generated random number. Thereby, the musical tones output by the plurality of tone generators can be independently localized in random numbers, and a new sound field effect can be obtained.

In the sound image localization apparatus of the second aspect, the sound image of one musical sound is localized by the first and second sound image localization means. Each sound image localization unit is supplied with a random number generated independently as a parameter for localization. The tone output from the second sound image localization means is given a delay effect by the delay effect giving means, and these tone sounds are mixed and output. As a result, one musical tone is mixed and output after being given two different localizations and time lags, and an extremely complicated localization feeling can be generated.

(F) Embodiment FIG. 1 is a block diagram of an electronic musical instrument provided with a sound image localization device according to an embodiment of the present invention. This electronic musical instrument has a keyboard 1 and specifies the pitch of a musical tone by turning on a key of the keyboard 1. Based on the designation, the tone generator 3 forms musical tone waveform data (digital data). The musical sound waveform data is converted into an analog signal and is output from the left and right two-channel sound systems 12 and 13.

The keyboard 1 is connected to a key assigner 2, and the key assigner 2 is connected to a tone generator 3 having a plurality (n) of sound channels. Tone generator 3
Can form tone waveform data independently for each sounding channel. The tone generator 3 may be a circuit having a circuit for each sounding channel separately, or may be a device for forming tone waveform data for a plurality of channels in a time-division manner. The tone waveform data generated by the tone generator 3 is input to independent sound image localization circuits 4. The sound image localization circuit 4 divides monaural musical sound waveform data into two left and right output channels, and adjusts the volume level, delay time, high-pass characteristics, and the like in each sounding channel, thereby producing the musical sound (musical sound waveform data). Is two-dimensionally localized. This sound image localization circuit 4
For example, a circuit in which a delay circuit, a low-pass filter, a variable amplification factor amplifier, and the like are connected in series may be used, or an FIR filter that simulates a sound transmission system may be used. Further, as shown in FIG. 2, a combination of these may be used.

FIG. 2 shows a circuit in which a delay and a variable amplification factor amplifier are combined with an FIR filter. The FIR filter is a filter that can simulate an impulse response waveform of an arbitrary transmission system by giving an appropriate parameter, and the parameter is an instantaneous value of the impulse response waveform at each shift timing.

Further, a circuit may be separately provided for each sounding channel, and a time-division operation may be performed. The tone waveform data localized separately is added by adders 9 (left) and 10 (right) provided for the left and right output channels. The added left channel data is stored in the D / A conversion circuit 11
-The right channel data generated and added from the sound system 12 is converted into a D / A conversion circuit 13-the sound system 14
Pronounced from

A parameter for localizing a sound image two-dimensionally is input to the sound image localization circuit 4. This parameter is input as x, y coordinate values. x-coordinate value is random generator 6
And a low-pass filter (LPF) 6,
The y coordinate value is formed by the random generator 7 and the LPF 8. The random generators 5 and 7 are circuits that generate random numbers within a preset range at regular time intervals, and LP
F6 and F8 are circuits for slowing down the change in output (coordinate value) due to continuous random numbers. The outputs of the LPFs 6 and 8 do not completely follow the random numbers but change smoothly. Thereby, the unnaturalness of the movement of the localization of the sound image can be eliminated. The random generators 5, 7-LPFs 6, 8 may output x, y coordinate values common to each sounding channel, or may output separate x, y coordinate values to each sounding channel. .

FIG. 3 is a block diagram of an electronic musical instrument according to another embodiment of the present invention. This electronic musical instrument is also an electronic keyboard musical instrument similar to the above-described embodiment, and the tone generator 21 can form musical tone waveform data by operating the keyboard 20. The tone waveform data generated by the tone generator 21 is transmitted through two paths, namely, a sound image localization circuit 22 (first path) and a sound image localization circuit 35-delay circuits 36 and 37 (second path).
The left output channel (adder 27-D / A conversion circuit 28, sound system)
29) and right output channel (adder 30-D / A conversion circuit 3)
1, output from the sound system 32). Sound image localization circuit
Reference numerals 22 and 35 denote circuits for two-dimensionally locating musical sounds (musical sound waveform data) based on the input x and y coordinate values. The x-coordinate value is input to the sound image localization circuit by the random generator 23-LPF24, and the y-coordinate value is input by the random generator 25-LPF26. The x-coordinate value input to the sound image localization circuit 35 is a value obtained by passing one output selected by the selector 39 among the random generators 23 and 38 to the LPF 40, and the y-coordinate value is the random generators 25 and 41. Is a value obtained by passing one output selected by the selector 42 through the LPF 43. The selection operation of the selectors 39 and 42 is performed by the instruction circuit 45.
Random generator 2
3,25 or random generators 38,41 are selected in combination. When the random generators 23 and 25 are selected, the localization by the sound image localization circuit 22 and the localization by the sound image localization circuit 35 are the same. The selection of the selectors 39 and 42 and the delay time of the delay circuits 36 and 37 are determined by the instruction signal output from the instruction circuit 45. The instruction signal is a binary signal that indicates separation or merging. When a signal instructing separation is output from the instruction circuit 45, the selectors 39 and 42 select the random generators 38 and 41, and the delay circuits 36 and 37 apply a delay of about 30 ms. Thereby, the first route, the second route
The sound image localized by the path will be separated. On the other hand, when the instruction circuit 45 outputs a signal for instructing merging, the selectors 39 and 42 select the random generators 23 and 25, and the delay circuits 36 and 37 do not delay. Thereby, the localization of the sound image by the first path and the second path becomes the same, and both sound images are united. Indication circuit
The player can instruct whether the 45 outputs the separation signal or the combined signal by operating the operation unit 44. Further, the delay circuits 36 and 37 do not discontinuously (rapidly) increase or decrease the delay time when switching the separated signal / combined signal, but gradually decrease or increase the delay time, thereby preventing a sudden change in the delay time. Note that the LPFs 40 and 43 suppress abrupt changes in the x and y coordinate values input to the sound image localization circuit 35 at the time of switching between the separated signal and the combined signal.

In this embodiment, only one tone system below the tone generator 21 is described, but an electronic musical instrument having a plurality of systems (sound generation channels) can realize the same function. In this case, the plurality of sounding channels may be formed by separate circuits or by time division.

By doing so, the sound image can be separated or combined into two, and a special effect that has never been achieved can be obtained. In this case, the number of separations is 2
However, the present invention is not limited to this and may be separated into three or more.

(G) Effect of the Invention As described above, according to the sound image localization apparatus of the present invention, a plurality of independently generated random numbers are used as parameters for controlling a plurality of sound image localization means for localizing a plurality of musical sounds. Thus, the sound image localization position of each musical tone is determined independently and randomly, and the sound image can be localized when the player or listener does not intend at all, and a new sound field effect can be obtained. Further, according to the sound image localization device of the present invention, two independently generated random numbers are used as parameters for controlling the two sound image localization means for localizing one musical tone, and are output from the second sound image localization means. By adding a delay effect to the played music,
Two localizations and a time shift can be given to one musical tone, and by mixing and outputting these, an extremely complicated localization feeling can be realized.

[Brief description of the drawings]

FIG. 1 is a block diagram of an electronic musical instrument provided with a sound image localization apparatus according to an embodiment of the present invention. FIG. 2 is a diagram showing an example of a sound image localization apparatus using an FIR filter used in the electronic musical instrument. FIG. 9 is a block diagram of an electronic musical instrument according to another embodiment of the present invention. 4,22,35 …… Sound image localization circuit, 3,21 …… Tone generator, 5,7,23,25,38,41 …… Random generator, 6,8,24,26,39,42 …… Low-pass filter (LPF), 12,14,29,32 ... Sound system.

Continuation of the front page (56) References JP-A-49-45713 (JP, A) JP-A-2-304487 (JP, A) JP-A-62-140600 (JP, A) JP-A-63-44600 (JP, A) , U) Japanese Utility Model 1-91400 (JP, U) JP-B 62-62356 (JP, B2)

Claims (2)

(57) [Claims] A plurality of sound image localization means for independently localizing the sound image of each tone output from a plurality of tone generators capable of independently generating musical sounds based on a parameter for two-dimensionally specifying a sound image localization position. And random number generating means for independently generating random numbers corresponding to the plurality of sound image localization means, and supplying the generated random numbers to the corresponding sound image localization means as the parameters, respectively. Sound image localization device. 2. A first and second sound image localization means for independently localizing a sound image of one input tone based on a parameter for two-dimensionally specifying a sound image localization position. First and second random number generating means for generating a random number and supplying the generated random number as the parameter to the first and second sound image localization means, respectively, for a tone output by the second sound image localization means A delay effect applying means for applying a delay effect, and an output means for mixing and outputting the musical sound output by the first sound image localization means and the musical sound output by the delay effect applying means. Sound image localization device.