JP3459016B2 - Audio signal processing method and apparatus - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an audio signal processing suitable as a sound source for electronic musical instruments and video games.
The present invention relates to a processing device, and more particularly, to an audio processing method and device for which pitch control and tone color control are easy when synthesizing musical sounds.

[0002]

2. Description of the Related Art As a conventional musical tone synthesizer, musical tone waveform data obtained by sampling an actual natural musical instrument sound or the like and performing PCM coding is stored in a memory and is reproduced at the time of reproduction.
The tone waveform data stored in the memory is changed at a speed corresponding to the pitch specified on the keyboard (changing the time axis).
There is known a so-called waveform memory type musical tone synthesizer which obtains a musical tone waveform having a designated pitch by sequentially reading it. When storing musical tone waveform data encoded by PCM (Pulse Code Modulation) in a memory, the musical tone waveform data may be written in a ROM (Read Only Memory) in advance, or a user may arbitrarily store a RAM (Random Access Memory). ) In some cases. With this waveform memory type musical sound synthesizer, a musical sound faithful to an actual natural musical instrument sound can be generated.

As a conventional musical tone synthesizer, in addition to the above-mentioned waveform memory type musical tone synthesizer, a carrier wave signal in the audible band is frequency-modulated by a modulated wave signal in the audible band in accordance with a predetermined frequency modulation algorithm. FM (Frequency Modulation), which synthesizes musical tones containing harmonic components
Musical tone synthesizers are also known. In this FM tone synthesizer, various tones can be synthesized by controlling parameters such as modulation index and frequency ratio.
This FM-type musical sound synthesizer can synthesize special effect sounds that do not exist in nature.

[0004]

The above-mentioned conventional waveform memory type musical tone synthesizer has a problem that the controllability of the musical tone waveform is poor although the musical tone waveform reproducibility is excellent. That is, in an actual natural musical instrument, for example, when a piano is taken as an example, it is known that the tone color changes subtly if the pitch or the speed at which a key is pressed (key touch) changes. It is also known that the timbre changes subtly with the passage of time from the start of the generation of musical tones. However, in the above-mentioned waveform memory type musical tone synthesizer, since the controllability of the musical tone waveform is poor, if it is attempted to cope with the above-mentioned subtle changes in tone color, it will be necessary to cope with all performance conditions such as pitch and key touch. Therefore, it is necessary to store musical tone waveform data for each performance condition, which requires a huge memory capacity.

In order to reduce the memory capacity in this case,
There is also known a technique in which musical tone waveform data is intermittently sampled and stored for continuous variations of the playing condition, and the musical tone waveform data during that period is interpolated so as to cross-fade according to parameters such as pitch and key touch. . However, in the case of interpolation processing on the time axis, depending on the phase relationship between a plurality of musical tone waveforms used for interpolation, the plurality of musical tone waveforms may cancel each other out, and appropriate interpolation may not be possible. Further, the FM tone synthesizer described above has a problem that the reproducibility of an actual natural musical instrument sound is poor although the controllability of the tone waveform is excellent. Audio The present invention has been made in view of the circumstances as described above, a small stored information, which can be variously changed the pitch and tone of the left synthesized tone leaving the characteristics of the original sound
It is an object of the present invention to provide a signal processing method and device.

[0006]

An audio signal processing method according to the present invention comprises a band division step of dividing an audio signal to be stored into signals of a plurality of frequency bands, and each frequency band divided by the band division step. A first frequency conversion step of frequency-converting the signal of 1 to a signal in the same band as the lowest frequency band among them, and a signal of each frequency band frequency-converted in the first frequency conversion step. A storage step of storing, an amplitude control step of reading out the signal stored in the storage step and controlling the amplitude of the signal for each frequency band, and a frequency of the signal whose amplitude is controlled according to the pitch information. The required frequency
The sine wave generated by the sine wave generator
The original frequency band is
A second frequency conversion step of performing frequency conversion into a frequency- shifted frequency and a synthesis step of synthesizing the amplitude-controlled and frequency-converted signals in all frequency bands to generate an audio signal. It is characterized by having.

The audio signal processing device according to the present invention divides an audio signal to be stored into signals of a plurality of frequency bands, and a signal of each frequency band divided by the band dividing device among them. a first frequency <br/> number converting means for frequency-converting the same band signal with the lowest frequency band in a memory means for storing the signals of each frequency band frequency-converted by the first frequency converting means , The signal stored in the storage means is read out and based on the tone color information.
And amplitude control means for controlling the amplitude of the signal for each frequency band, second frequency conversion means for frequency-converting the frequency of the signal whose amplitude is controlled to a frequency based on the original frequency band, and said amplitude And synthesizing means for synthesizing the signals of all the frequency bands that have been controlled and frequency-converted to generate an audio signal.

[0008]

In the audio signal processing method and apparatus of the present invention, the audio signal to be recorded is divided into signals of a plurality of frequency bands , and the signals of each frequency band are divided into those signals.
Strange frequency to the same band of the signal with the lowest frequency band out
Conversion to may be stored, the stored signals are read, and controls the amplitude of the signal in each frequency band, the amplitude control of
Control based on the original frequency band the frequency of the signal
Then, the signals of each frequency band are combined to synthesize the required audio signal.
Since the signal is generated, the pitch and tone color of the synthesized musical tone can be variously changed with a small amount of stored information while keeping the characteristics of the original tone.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. 1 and 2 schematically show the configuration of a musical sound synthesizer according to the first embodiment of the present invention. In the first embodiment, the basic configuration of the musical tone synthesizing device according to the present invention has an synthesizing storage unit for analyzing and storing a representative tone and a synthesizing process for synthesizing a musical tone signal from stored representative tone information. FIG. 1 shows the configuration of the analysis storage unit.
The configurations of the composition processing units are shown in FIG.

The analysis storage section shown in FIG. 1 has an A / D (analog-digital) conversion section 11, a band division section 12, a first frequency conversion section 13 and a memory 14. Further, the synthesis processing unit shown in FIG. 2 includes a memory 14 ′ common to the memory 14 of FIG. 1, an amplitude control unit 15, a second frequency conversion unit 16, a sine wave generation unit 17, a synthesis unit 18, and a multiplier 19.
And a D / A (digital-analog) converter 20. In the analysis storage unit of FIG. 1, the A / D conversion unit 11
Is to sample the input representative sound acoustic signal (analog signal) at the sampling frequency Fs and convert it into digital data. The band division unit 12 has a plurality of bandpass filters, and divides the acoustic signal data sampled and digitized by the A / D conversion unit 11 into N frequency bands.

The first frequency conversion section 13 is a band division section 1
Each frequency band divided into N bands by 2 (If the upper limit of the frequency band that can be handled is Fs / 2, then each is Fs / 2N.
(With a bandwidth of), frequency conversion is performed on the signal data, and the signal data is in the same band as the lowest band of all the divided bands. The first frequency conversion unit 13 has a built-in sine wave generation unit that generates a predetermined sine wave as necessary in order to perform a predetermined frequency conversion for each divided band, or a memory equivalent thereto. . The memory 14 is composed of, for example, a RAM, and stores the signal data of the representative sound obtained by the first frequency conversion unit 13.

In the synthesizing section of FIG. 2, the memory 14 '
Stores one or more sets of signal data of the representative sounds written by the analysis storage unit configured as shown in FIG. 1, and normally uses the memory 14 itself shown in FIG. As the memory 14 ', a ROM or the like in which one or more sets of representative tone signal data separately obtained in advance as described above may be used, and similarly, a memory card in which one or more sets of representative tone signal data are written. Etc. may be detachably used. From this memory 14 ', signal data of a specific representative tone is selectively read according to the basic tone color information D1, for example.
The amplitude control section 15 controls the amplitude of the signal data of each band of the specific representative sound read from the memory 14 'for each band. The amplitude control section 15 controls the amplitude of the signal data for each band in a predetermined pattern according to the auxiliary tone color information D2, for example.

The second frequency conversion section 16 frequency-converts the signal data for each band whose amplitude distribution pattern is controlled by the amplitude control section 15 into a frequency corresponding to the pitch information D3 and corresponding to the original band frequency. To do. That is, in the frequency conversion process of the second frequency conversion unit 16, the original band frequency is frequency-shifted according to the pitch information D3. The sine wave generator 17 is, for example, an RO that stores digitized sine waveform data.
M, a so-called sine ROM, and a sine wave of a required frequency for performing frequency conversion of the signal data of each band into a predetermined frequency in the second frequency conversion unit 16 in accordance with the pitch information D3. Generate a signal. The frequency of this sine wave signal determines the amount of frequency change in the frequency conversion of the signal data for each band by the second frequency conversion unit 16. This frequency change amount corresponds to the mutual relationship between the signal data for each band and the mutual relationship between the original band frequencies, and is an amount that can achieve a frequency shift corresponding to the pitch information D3 over the entire band frequencies.

The synthesizing unit 18 additively synthesizes the signal data for each band which has been frequency-converted by the frequency conversion processing of the second frequency conversion unit 16. The multiplier 19 includes a synthesizing unit 18
The level information D4 of the signal combined in step S4 is multiplied to control the combined signal level. The D / A converter 20 converts the composite signal, the level of which is controlled by the multiplier 19 according to the level information D4, into an analog signal and outputs it as a reproduction signal. First
The second frequency converters 13 and 16 are specifically configured as shown in FIGS. 3 (a) and 3 (b), for example.

The first frequency converter 13 shown in FIG. 3 (a)
Is a plurality of sets of multipliers 31a, 31b ... And a filter 3
2a, 32b ... Filters 32a, 32b ...
Is a low pass filter (LPF). Multiplier 31a
Is multiplied by a sine wave having a predetermined frequency with respect to the converted input signal, and only the difference frequency component of the sum and difference frequency components obtained as a result of the multiplication is extracted by the filter 32a which is a low-pass filter. .

The second frequency converter 16 shown in FIG. 3 (b).
Is a plurality of sets of filters 33a, 33b ... And a multiplier 3
4a, 34b ... Filters 33a, 33b ...
Can be configured by the same low-pass filter as the filters 32a, 32b .... The converted input signal read from the memory 14 'and supplied via the amplitude controller 15 is sampled at the same sampling frequency Fs as the sampling of the A / D converter 11 when reading from the memory 14'. For this reason, the high-frequency unnecessary components are removed by the filters 33a, which are low-pass filters, and then multiplied by the sine wave of a predetermined frequency by the multipliers 34a. At this time, the difference frequency component of the sum and difference frequency components obtained as a result of the multiplication is removed in the process of signal processing, and substantially only the sum frequency component is subjected to the subsequent processing.

In the musical sound synthesizing apparatus shown in FIGS. 1 and 2, when storing the representative sound data in the analysis storage section, when the acoustic signal to be sampled is input by a microphone (microphone) or the like, The acoustic signal is sampled by the A / D converter 11 at the sampling frequency Fs, converted into digital data, and band-divided by the band divider 12 into N bands. Band division unit 12
Each band having a bandwidth of Fs / 2N, which has been band-divided by, is frequency-converted by the first frequency conversion unit 13 to be a signal in the same band as the lowest band among the bands after the division. And stored in the memory 14. The storage of such representative sounds is performed for one or more kinds of required representative sounds.

The memory 14 'of the synthesis processing section stores at least one set of the representative sound data thus stored. The representative tone data stored in the memory 14 'is selectively read according to the basic tone color information D1 given when the synthesized tone is generated, and each band is determined in accordance with the auxiliary tone color information D2 related to the pitch information D3, for example. The amplitude control unit 15 adjusts the amplitude of each. Amplitude control unit 1
The signal for each band that has passed 5 is subjected to frequency conversion by the second frequency conversion unit 16 using a sine wave signal having a frequency for each band generated from the sine wave generation unit 17 according to the pitch information D3. Then, the synthesizing unit 18 performs additive synthesis. The data synthesized by the synthesizer 18 is multiplied by the level information D4 by the multiplier 19 and output as an analog reproduction signal via the D / A converter 20.

Next, an example of concrete signal processing in the first embodiment will be described. When the sampling frequency Fs in the A / D conversion unit 11 of the analysis storage unit is 50 KHz and the number N of divided bands in the band dividing unit 12 is 500, the fundamental frequency is 1.025 KHz, 3.075 KHz and 5.1.
Consider a case where a representative sound including a harmonic component having a frequency of 25 KHz is sampled. Sampling frequency Fs is 50
Since it is KHz, the upper limit of the signal that can be processed is Fs /
2, that is, 25 KHz, and 0 to 25 KHz becomes 50
When it is divided into 0, it is divided into frequency bands of 50 Hz, and the first band from the low frequency side is 0 to 50H.
The zth and 500th bands are 24950 to 25000 Hz, and the nth band is (n-1) × 50 Hz to n × 50.
It becomes Hz.

Therefore, the fundamental frequency is 1.025 KH
Overtone frequencies of 3.075 KHz and 5.125 K at z
The representative sound of Hz is sampled by the A / D converter 11,
As a result of band division by the band division unit 12, 1.025 KHz
The fundamental wave component of is included in the 21st band, the overtone component of 3.075KHz is included in the 62nd band, and the overtone component of 5.125KHz is included in the 103rd band. Such a component for each divided frequency band is stored in the memory 14 (14 '). The above-mentioned representative sound stored in the memory 14 (14 ') is selected by the basic timbre information D1 and is reproduced by increasing the frequency by 10% in accordance with the pitch information D3 by the frequency conversion unit 16 via the amplitude control unit 15. , The nth band is (n
-1) It may be converted to x50x1.1 to nx50x1.1 Hz. At this time, the element of the 21st band is 1.025KH
The fundamental wave component of z is 1.1275 KHz, and the overtone component of the original 3.075 KHz of the 62nd band is 3.3825 KH.
In z, the original 5.125 KHz overtone component of the 103rd band becomes 5.6375 KHz, and as a result, the pitch, that is, the pitch is increased by 10%.

At this time, when it is desired to change the timbre according to the pitch or to change the timbre to produce a desired effect, the amplitude control section 1 is controlled by the auxiliary timbre information D2.
The amplitude pattern of each band may be controlled at 5 to change the amplitude value of the n-th band. Also, if you want to adjust the overall pitch of the playback sound or obtain special effects such as vibrato, you can change the target frequency for band conversion,
It may be changed periodically. If you do this,
The sampled musical sound waveform is divided into a plurality of frequency bands, and each frequency band component is frequency-converted into a signal in the same band as the lowest band among the divided bands, and is stored. By arbitrarily setting the level of the frequency band component and the center frequency, it is possible to change the frequency and the timbre variously while the characteristics of the original sound remain. Therefore, it is not necessary to store musical tone waveform data corresponding to various playing conditions, and the memory capacity can be greatly reduced.

It is also possible to faithfully reproduce the original representative sound by storing the frequency conversion information of each frequency band at the time of storage and performing the frequency conversion according to the frequency information at the time of reproduction. Further, also when synthesizing a plurality of musical tone waveforms of different tones, each frequency band component of the signal in the same band as the lowest band among the bands after division is simply mixed in the preceding stage of the frequency conversion unit 16, and thereafter, In addition, since frequency conversion may be performed, it is possible to easily perform a process of synthesizing different timbres.

FIG. 4 shows the configuration of a video game apparatus according to the second embodiment of the present invention in which the above-described musical tone synthesizer is applied to a sound source. The video game device shown in FIG.
PU (central processing unit) 41, ROM / RAM (at least one of ROM and RAM) 42, controller 4
3, a video display controller (abbreviated as "VDP") 44 having a built-in VRAM (video RAM) 44, a CRT
It has a (cathode ray tube) display 45, a sound source 46 and a sound system 47 having the same configuration as in FIGS. The CPU 41, ROM / RAM 42, controller 43, VDP 44, and sound source 46 are connected via a bus line 48, and a CRT display 45
Is coupled to VDP 44 and sound system 47 is coupled to sound source 46.

In the configuration of FIG. 4, the ROM / RAM 42
VDP by the CPU 41 in response to the program stored in the memory and the operation signal of the controller 43 for game operation.
A game image is displayed on the CRT display 45 via 44, and the above-mentioned information D1 to D from the CPU 41.
A signal corresponding to 4 is supplied to the sound source 46, and a tone signal output from the sound source 46 is supplied to the sound system 47 for driving a speaker or the like, and sound corresponding to the progress of the game is generated. FIG. 5 shows a partial configuration of an electronic musical instrument according to a third embodiment of the present invention in which the musical tone synthesizer as described above is applied as a sound source. FIG. 5 shows the third aspect of the present invention.
3 shows a configuration of a control processing unit for supplying control information to a musical tone synthesizer similar to that shown in FIGS. 1 and 2 in the electronic musical instrument according to the embodiment of FIG.

The control processing unit of FIG. 5 includes a keyboard 51, a first table 52, an envelope generating unit 53, and a timer 5.
4, a tone color control unit 55, a tone color selection switch 56, a second table 57, a vibrato depth speed setting unit 58, and a vibrato waveform generating unit 59. In the control processing unit of FIG. 5, the keyboard 51 has a key consisting of a white key and a black key, and a key code signal K indicating the operated key.
C, a key-on signal KON indicating the ON state of the key operation and a key-touch signal T indicating the information of the key touch of the key operation.
Output OUCH. The first table 52 is a conversion table for converting the key code signal KC into basic pitch information D3 '. The envelope generating section 53 forms level information D4 for forming an envelope including a waveform portion such as so-called A (attack) D (decay) S (sustain) R (release) based on the key-on signal KON and the key touch signal TOUCH. To generate.

The timer 54 measures the duration of the key-on signal KON. The tone color control section 55 uses the key code signal K
The auxiliary tone color information D2 for controlling the tone color of each band is generated according to C, the key touch signal TOUCH, and the measurement output of the timer 54. That is, the auxiliary tone color information D2 for controlling the tone color of each band is also controlled by the key code information KC, the duration of the key-on signal KON, and the key touch information TOUCH. The timbre selection switch 56 is a switch for designating a basic timbre by designating a desired instrument name or the like. The second table 57 is a conversion table for converting the tone color information designated by the tone color selection switch 56 into the corresponding basic tone color information D1.

The vibrato depth speed setting unit 58 is used to set at least one of the desired depth and speed of the vibrato, and the vibrato depth speed setting unit 58.
The vibrato waveform generator 59 outputs, for example, sine-wave vibrato waveform information D5 in accordance with the setting. The basic pitch information D3 ′ and the vibrato waveform information D5 are shown in FIG.
Pitch information for controlling the sine wave generating unit 17 of the synthesis processing unit of FIG. 2 after being substantially multiplied by the multiplier 60 as shown in FIG. 3 and the basic pitch information D3 ′ and the vibrato waveform information D5 are superimposed. It becomes D3. By supplying the information D1 to D4 obtained by such a configuration to the synthesis processing unit as shown in FIG. 2, it is possible to generate musical tone information of a desired tone color.

If the electronic musical instrument does not require a representative sound sampling function, and the video game device does not need to have the configuration of the analysis storage unit of FIG. 1, the configuration similar to that of FIG. Stored ROM,
The tone generator may be composed of a tone synthesizer including only a synthesizer as shown in FIG. 2 using a non-volatile RAM or the like as the memory 14 '. Further, the musical sound synthesizer of FIGS. 1 and 2 is
Although the above-described processing is performed after the input audio signal is digitized and then returned to analog at the time of reproduction, all analog processing may be performed as in the fourth embodiment of the present invention shown in FIG. .

In this case, the band division unit 71, the first frequency conversion unit 72, the memory 73, the amplitude control unit 74, the second frequency conversion unit 75, and the synthesis unit 76 are all
The band division unit 12, the first frequency conversion unit 13, the memory 14 (14 '), and the amplitude control unit 1 of FIGS.
5, the second frequency conversion section 16 (including the sine wave generation section 17), and an analog processing circuit having the same function as the synthesis section 18, and the amplitude control section 74 controls the final output level. Alternatively, an attenuator or the like may be provided on the output side of the synthesizer 76. It should be noted that the above-described musical tone synthesizing apparatus, even when synthesizing a plurality of musical tone waveforms of different timbres, simply needs to mix the respective frequency band components and then frequency-converts them, thereby facilitating the synthesizing process of different timbres It can be carried out.

[0030]

As described above, according to the present invention,
An audio signal to be recorded is divided into signal <br/> of a plurality of frequency bands, may be stored signals of each frequency band by the frequency conversion to the same band of the signal with the lowest frequency band among them, This stored signal is read out and each frequency band
The amplitude of the signal is controlled for each region, and the frequency of the signal whose amplitude is controlled is controlled with the original frequency band as the reference.
So as to generate the required audio signals of the signal synthesized and less in stored information, an audio signal processing method and apparatus can be variously changed the pitch and tone of the left synthesized tone leaving the characteristics of the original sound Can be provided.

That is, according to the present invention, the sampled tone waveform is divided into a plurality of frequency bands, and each frequency band component is frequency-converted into a signal in the same band as the lowest band among the divided bands and stored. Therefore, at the time of reproduction, by arbitrarily setting the level and center frequency of each frequency band component, the frequency and tone color can be variously changed while the characteristics of the original sound remain. Therefore, it is not necessary to store musical tone waveform data corresponding to all playing conditions, and the memory capacity can be greatly reduced. It is also possible to faithfully reproduce the original sound by storing the frequency conversion information of each frequency band at the time of storage and performing the frequency conversion according to the frequency information at the time of reproduction.

[Brief description of drawings]

FIG. 1 is a block diagram schematically showing a configuration of an analysis storage section in a first embodiment of a musical sound synthesis apparatus according to the present invention.

FIG. 2 is a block diagram schematically showing a configuration of a synthesis processing section in the first embodiment of the musical sound synthesis apparatus according to the present invention.

FIG. 3 is a block diagram schematically showing a specific configuration of a frequency conversion unit used in the embodiments of FIGS. 1 and 2.

FIG. 4 is a block diagram schematically showing a configuration of a video game device according to a second embodiment of the musical sound synthesizing device according to the present invention.

FIG. 5 is a block diagram schematically showing a partial configuration of an electronic musical instrument according to a third embodiment of the musical sound synthesizing apparatus of the present invention.

FIG. 6 is a block diagram schematically showing the configuration of another part of the electronic musical instrument according to the third embodiment of FIG.

FIG. 7 is a block diagram schematically showing the configuration of a fourth embodiment of the musical sound synthesizing apparatus according to the present invention.

[Explanation of symbols]

11 ... A / D (analog-digital) converter, 12,
71 ... Band division unit, 13, 16, 72, 75 ... Frequency conversion unit, 14, 14 ', 73 ... Memory, 15, 74 ... Amplitude control unit, 17 ... Sine wave generation unit, 18, 76 ...
Synthesis part, 19, 31a, 31b, 34a, 34b, 60
... multiplier, 20 ... D / A (digital-analog) converter, 32a, 32b, 33a, 33b ... Filter, 41
... CPU (Central Processing Unit), 42 ... ROM / RAM, 4
3 ... Controller, 44 ... Video display control unit (VDP), 45 ... CRT display, 46 ... Sound source,
47 ... Sound system, 51 ... Keyboard, 52, 5
Reference numeral 7 ... Table, 53 ... Envelope generating unit, 54 ... Timer, 55 ... Tone color control unit, 56 ... Tone selection switch, 58
... Vibrato depth speed setting unit, 59 ... Vibrato waveform generating unit.

   ─────────────────────────────────────────────────── ─── Continued front page       (56) Reference JP-A-2-84697 (JP, A)                 JP-A 1-257899 (JP, A)                 Japanese Patent Laid-Open No. 1-116595 (JP, A)                 JP 63-85700 (JP, A)                 Japanese Patent Publication Sho 56-3560 (JP, B2)

Claims (2)

(57) [Claims] 1. A band division step of dividing an audio signal to be stored into signals of a plurality of frequency bands, and a signal of each frequency band divided in the band division step having the same band as the lowest frequency band among them. a first frequency conversion step of converting frequency of the signal, a storing step of storing the signal of the first of each frequency band is frequency-converted by the frequency conversion step, a signal stored in the storing step is read, The amplitude control step of controlling the amplitude of the signal for each frequency band, and the frequency of the signal whose amplitude is controlled according to the pitch information.
Sine wave generation to generate a sine wave signal with the required frequency
A sine wave that is generated from the parts, by multiplying a second frequency conversion step of frequency conversion to the frequency obtained by frequency shifted with respect to the original frequency band, all frequencies the amplitude-control and frequency conversion And a synthesizing step of synthesizing band signals to generate an audio signal. 2. A band division unit for dividing an audio signal to be stored into signals of a plurality of frequency bands, and a signal of each frequency band divided by the band division unit having the same band as the lowest frequency band among them. A first frequency conversion means for frequency-converting to a signal, storage means for storing a signal of each frequency band frequency-converted by the first frequency conversion means, and a signal stored in the storage means for reading For tone information
Amplitude control means for controlling the amplitude of the signal for each frequency band based on the second frequency conversion means for frequency-converting the frequency of the amplitude-controlled signal into a frequency based on the original frequency band; An audio signal processing device, comprising: a synthesizing unit for synthesizing signals of all frequency bands subjected to amplitude control and frequency conversion to generate an audio signal.