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JPH11231865

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Notice
This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
financial decisions, should not be based on machine-translation output.
DESCRIPTION JPH11231865
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
stereo tone generation method usable for a tone generator system and its device.
[0002]
2. Description of the Related Art An electronic musical instrument having a stereo output has two
data of right side waveform and left side waveform and is generated separately. Alternatively,
stereo musical tones are generated by changing the monaural waveform data into two different
frequency characteristics or phase characteristics and separately outputting them on the right
and left sides. In addition, stereo musical tones are generated by changing and controlling the
phase characteristics of monaural waveform data using a delay circuit and outputting the same
separately to the right and left sides. The same thing can be achieved by shifting the waveform
read start address in the waveform read out sound source.
[0003]
[Problems to be solved by the invention] When there are two data of right side waveform and left
side waveform for stereo output, the amount of data becomes twice that of monaural output,
requiring a large storage capacity It will be much more if prepared for). In addition, there is a
disadvantage that it is difficult to obtain a natural stereo feeling in terms of auditory sense only
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by changing the frequency characteristic and the phase characteristic. Furthermore, in the
configuration using the delay circuit, there is a problem that it is very difficult to obtain
parameters for obtaining a natural stereo feeling.
[0004]
The present invention has been made in view of the above problems of the prior art, and it is an
object of the present invention to provide a stereo musical tone generating method and its device
capable of obtaining a natural stereo feeling with a small storage capacity.
[0005]
[Means for Solving the Problems] Therefore, in the stereo musical tone generation method
according to the present invention, it is basic to add two or more kinds of fluctuation signals to a
monaural musical tone to generate two or more musical tones and to make them into stereo
musical tones. It is characterized.
Here, the fluctuation is a minute fluctuation component of the amplitude and frequency of a
natural sound and a musical instrument. The amplitude fluctuation can be extracted by removing
the amplitude envelope from the temporal change of the amplitude of the musical tone
waveform, and the frequency fluctuation can be extracted by removing the frequency envelope
from the temporal change of the frequency of the musical sound waveform. In order to remove
the monotony of the electronic sound and generate a pleasantly audible musical tone like a
natural sound, it is necessary to provide a fluctuation component to the time fluctuation of the
amplitude of the electronic sound or the time fluctuation of the frequency. In the above
configuration, it is possible to obtain natural auditory feeling by adding the fluctuation signal to
the monaural sound by utilizing the above nature of fluctuation, and to add two or more kinds of
fluctuation signals to the monaural sound. Therefore, it is possible to generate a musical tone to
which two or more kinds of fine amplitude components of amplitude and frequency are added.
For example, when generating two kinds of musical tones, the right waveform and the left
waveform are output from separate speakers etc. In this way, you can get a stereo feeling of
natural feeling. Of course, three or more types of musical tones may be generated, and monaural
musical tones may be generated to generate musical tones to which fine fluctuation components
are added from many directions such as, for example, a surround system.
[0006]
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The parameters required to generate the fluctuation are distribution characteristic, frequency
characteristic and amplitude characteristic, but two or more kinds of fluctuation signals can be
generated by changing at least one of them. By adding the fluctuation signal generated as
described above to the monaural musical tone, a natural stereo feeling can be obtained.
[0007]
According to a third aspect of the present invention, there is provided a stereo musical tone
generator, which comprises at least an oscillator used to generate a musical tone signal, an
amplitude control unit for controlling the amplitude of the musical tone signal generated thereby,
and a frequency characteristic of the musical tone signal. And a fluctuation signal generator for
generating two or more kinds of fluctuation signals, to generate the musical tone. The frequency
characteristic control device for generating the musical tone and the musical tone output device
for outputting the musical tone These fluctuation signals are added to any one configuration or a
plurality of configurations, and the monaural musical tone signal is output as two or more stereo
musical tones. That is, although the configuration of the method according to claim 1 is a device
configuration, a configuration including a fluctuation signal generator that generates two or
more types of fluctuation signals to generate a musical tone (that is, an oscillation device, an
amplitude control device, and a frequency) It is characterized in that these fluctuation signals are
applied to any one configuration or a plurality of configurations in the configuration having at
least a characteristic control device and a tone output device, and an effect device added as
necessary. By this, it becomes possible to change monaural musical tones to stereo musical tones.
Among them, in the case where one of the oscillation device, the amplitude control device, and
the frequency characteristic control device which has an influence on the timbre, etc., or a
configuration in which these fluctuation signals are applied to two or more of them, Compared to
the configuration given to the device, more natural hearing can be obtained.
[0008]
The parameters required to generate the fluctuation are the distribution characteristic, the
frequency characteristic and the amplitude characteristic, but in the configuration of the abovementioned stereo tone generator, the fluctuation signal generator is a random number generator
that determines the distribution characteristic and the frequency characteristic When the
frequency characteristic control device such as a filter that controls the frequency characteristic
is required (the fluctuation signal generation device of this configuration needs to have at least
these two configurations), changing the initial setting of the random number generation device If
the above fluctuation signals are generated, a natural stereo feeling can be obtained by adding
these fluctuation signals to the monaural musical sound, as in the case described above.
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[0009]
Furthermore, the fluctuation signal generator can be configured by a storage device recording
the fluctuation signal.
In that case, two or more kinds of fluctuation signals can be generated by changing the reading
position.
[0010]
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A stereo musical tone generator
according to a third aspect of the present invention will be described below. FIG. 1 is a block
diagram showing the overall circuit configuration when a stereo tone generator according to an
embodiment of the present invention is used in an electronic musical instrument.
[0011]
In FIG. 1, an input device 110, a display device 111, a fluctuation signal generator 1, a central
processing unit 112, a storage device 113, an oscillation device 101, an amplitude control device
102, and a musical tone frequency are shown on a bus 100. The characteristic control device
103 and the effect device 104 are connected, and exchange of control signals, address signals
and data between them via the bus 100.
[0012]
The input device 110 includes various panel switches for control instructions connected via a
panel interface, a keyboard for inputting key information by a performer's performance, a MIDI
input device, a pedal, and other switches and volumes. There is also a case where a panel display
serving as an input panel switch may be a part of the device configuration, as described later.
[0013]
The display device 111 is connected with a panel interface, displays various setting states of the
electronic musical instrument, and the like, and comprises a panel display serving as an input
panel switch which doubles as an input configuration of the input device 110 as necessary. It is
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done.
[0014]
The central processing unit 112 is composed of a central processing unit CPU that performs
overall control and arithmetic processing.
For example, part of the control signal is issued from the central processing unit 112 for setting
the distribution characteristic, and is given to a random number generator of the fluctuation
signal generator 1 described later.
[0015]
The storage device 113 is a ROM for storing data such as a program and a distribution table to
be described later, a RAM for temporarily storing necessary data, coefficients, etc., or an external
storage device such as a flash memory card or a hard disk drive. It is configured.
[0016]
The oscillation device 101 is provided with a low frequency oscillator for giving a sawtooth wave,
and has a configuration of a sound source LSI having a digitally controlled oscillator as an
oscillation circuit as a configuration of waveform generation means for generating a musical tone
waveform.
Based on the MIDI information of the input device 110 and the performance information output
from the storage device 113 and the fluctuation signal output from the fluctuation signal
generator 1 described later, a waveform signal having a pitch is output.
[0017]
The amplitude control unit 102 is constituted by the sound source LSI having a digital controlled
amplifier that gives an amplitude envelope by an amplitude envelope generator while amplifying
a musical tone signal, and based on the MIDI information, the performance information and the
fluctuation signal, Performs processing of amplitude such as loudness, envelope, tremolo and
panning.
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[0018]
The frequency characteristic control unit 103 is composed of a digital filter for removing
unnecessary harmonic components from the musical tone waveform, and processes the
frequency characteristic based on the MIDI information, the performance information and the
fluctuation signal.
The configuration may be configured as part of the sound source LSI.
[0019]
The effect device 104 is composed of a sound processor and a digital signal processor, and has a
function of adding various sound effects such as reverb, chorus, distortion, flanger, phasor and
delay to musical tone signals. Based on these, processing of the tone signal is performed.
[0020]
In this configuration, the digital / analog conversion device 114 and the stereo audio device 115
are further provided, and the digital to analog musical tone signal is processed by the digital /
analog conversion device 114 for the tone signal processed by the effect device 104. , And
output as an audio signal from a stereo audio device 115 having an amplifier, a speaker and the
like.
[0021]
In the above configuration, the waveform signal output from the oscillation device 101 is
processed by the amplitude control device 102 and the frequency characteristic control device
103 to become a musical tone signal.
The tone waveform is processed by the effect unit 104 and D / A converted by the digital /
analog converter 114, and then the tone is generated by the stereo / audio unit 115.
As described above, each of these devices is controlled by the central processing unit 112 and its
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status is displayed by the display unit 111 for the user to confirm.
The present configuration includes the fluctuation signal generator 1 that generates two types of
fluctuation signals, and as shown in FIG. 2, these fluctuation signals are added to the
configuration of the amplitude control device 102 (and / or the oscillation device 101). , And
outputs a monaural musical tone signal as a stereo musical tone.
[0022]
FIG. 3 is a block diagram showing the detailed configuration of the fluctuation signal generator 1.
As shown in the figure, the fluctuation signal generator 1 has a random number generator 10, a
frequency characteristic controller 11 for fluctuation signals, and an amplitude controller 12 for
fluctuation signals, and these configurations are dedicated LSIs. (Or may be constituted by the
central processing unit and the storage unit 113, and a program for generating fluctuation and a
digital filter which are operated by these units). The above configuration is related to the
necessity of distribution characteristics, frequency characteristics and amplitude characteristics
parameters for generation of fluctuation. Therefore, each of these parameters will be designated
by the central processing unit 112.
[0023]
The random number generation device 10 generates a random number having a certain
distribution characteristic, and in addition to a configuration using a distribution table, a
configuration having a random number having a distribution characteristic in a storage device is
also conceivable. The configuration is used. FIG. 4 shows the configuration in the case of the
present embodiment using a distribution table. As shown in the figure, uniform random numbers
are generated by the M-sequence noise generator 10a, and random numbers having distribution
characteristics are generated by table conversion. In this configuration, the selector 10b receives
the distribution characteristic designation signal from the central processing unit 112 (the signal
is determined by the central processing unit 112 based on the parameters given from the input
unit 110). Table conversion is performed according to the selected distribution table by selecting
the distribution table of 1. In this table conversion, an address held on the selected table is
designated by the uniformly generated random number, and data on the table corresponding to
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the address is generated as a new random number. The M-sequence noise generating device 10a
is configured to generate uniform noise of distribution characteristics, but may be other uniform
random number generating means.
[0024]
FIG. 5 is a detailed explanatory view of the distribution table 10c. As shown in the figure, the
table is expanded on the ROM of the storage device 113, and in this configuration, as an
example, the address has addresses 0 to 15, and data corresponding to each of these addresses is
stored. Shows the condition. The data has a value of -3 to 3, and when the address is uniformly
accessed based on the uniform random number generated by the M-sequence noise generator
10a, the frequency distribution is as shown in Table 1 and FIG. 6 below. The distribution
characteristic is as shown in FIG.
[0026]
The distribution characteristics of natural sounds and fluctuation signals of live instruments are
similar to normal distribution. Also, the ones that are not so can be quite similar if the normal
distribution curve is easily deformed. Therefore, the types of distribution characteristics used in
this configuration are approximated as shown in FIG. The figure (a) is a normal distribution
curve. (B) and (c) of the figure shift the vertex of the curve of the figure (a) to the left. Similarly, it
may be shifted to the right.
[0027]
The frequency characteristic control unit 11 is constituted by a digital filter, and processes the
random number generated by the random number generation unit 10 into a frequency
designated by the central processing unit 112.
[0028]
The frequency characteristics of natural sounds and fluctuation signals of live instruments are
similar to the characteristics of low-pass filters.
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Therefore, the types of frequency characteristics controlled by this configuration are
approximated as shown in FIG. As shown in the figure, the cutoff frequency of the filter is
lowered in the order of (a), (b) and (c).
[0029]
Even if there are three kinds of distribution characteristics of the fluctuation signal and three
kinds of frequency characteristics of the fluctuation signal, there are nine combinations of them,
so that nine kinds of fluctuation signals can be selected.
[0030]
The amplitude control unit 12 is constituted by a digitally controlled amplifier that gives an
amplitude envelope by an amplitude envelope generator, and processes the random number
processed by the frequency characteristic control unit 11 into an amplitude characteristic
designated by the central processing unit 112.
The amplitude characteristic referred to here means the depth of the fluctuation signal with
respect to the tone waveform and the change of the temporal amplitude of the fluctuation signal.
[0031]
As described above, two types of fluctuation signals (right and left) are generated, and the
amplitude control device 102 adds different fluctuation signals to the amplitude control signals
of the right and left tones. Similarly, different fluctuation signals may be added to the oscillation
device 101 that performs pitch control. Alternatively, a fluctuation signal may be added to the
two device configurations. As a result, even if a monaural tone signal is output from the
oscillation device 101, a stereo signal can be obtained by changing the fluctuation signal given to
the right and left, and from the characteristic of the fluctuation, the outputted tone has a natural
hearing Is obtained. Furthermore, the configuration of the fluctuation signal generator 1 can be
configured by a storage device recording a fluctuation signal other than the above configuration.
In that case, two or more kinds of fluctuation signals can be generated by changing the reading
position.
[0032]
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The above-described configuration of the present invention is not of a nature incompatible with
the above-described configuration of the conventional stereo device, and by using it in
combination with these configurations, it is possible to output musical tones having a more
natural feeling and high stereo effect. It becomes possible.
[0033]
Further, the configuration of the present invention is applicable not only to stereo output of only
two types of output, but also to stereo output of three or more outputs, ie, surround output.
As shown in FIG. 9, this can be achieved by generating fluctuation signals different by the
number desired to be output, and adding these fluctuation signals to predetermined devices.
[0034]
According to the configuration of the present invention described in detail above, since a stereo
musical tone can be generated from a monaural musical tone, the storage capacity of waveform
data can be reduced when attempting to obtain a stereo musical tone. Becomes possible. Besides,
since a fluctuation signal is added to obtain stereo musical tones, more natural stereo feeling can
be obtained.
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