KR100620484B1 - Sound synthesizing device and storage medium storing program - Google Patents

Abstract

A simple structure synthesizes natural sounds. The sound synthesizer has a plurality of original signal output units 41. Each original signal output unit 41 includes a signal generator 41a for generating a signal Sa whose level changes periodically, and a multiplier 41b for multiplying the amplitude value by the signal Sa. The control apparatus 10 instructs each signal generator 41a of the phase p of the signal Sa at the start of a pitch period. At this time, "0" is indicated to the signal generator 41a in the odd-numbered original signal output unit 41 as the phase p, while the signal generator 41a in the even-numbered original signal output unit 41 is indicated. "Π" is indicated as the phase p.

Source signal output unit, controller, signal generator, amplitude value

Description

SOUND SYNTHESIZING DEVICE AND STORAGE MEDIUM STORING PROGRAM}

1 is a block diagram showing the configuration of a sound synthesizing apparatus according to an embodiment of the present invention.

Fig. 2 is a block diagram showing the configuration of a sound synthesizing unit in a homophonic synthesizing apparatus.

3 is a timing chart showing a signal output from the signal generator of each output unit.

4 is a timing chart showing the phase of a signal output from the signal generator of each output unit.

5 shows waveforms and spectrograms of synthesized sound signals;

6 is a block diagram showing a configuration of a sound synthesizing apparatus according to a modification of the embodiment.

7 is a block diagram showing the configuration of a conventional sound synthesizing apparatus.

Fig. 8 is a timing chart showing waveforms of signals provided to processing in the conventional sound synthesizing apparatus.

9 shows waveforms and spectrograms of a conventional synthesized sound signal.

<Explanation of symbols for the main parts of the drawings>

100: sound synthesizer

10: control device (instruction means)

20: storage device

30: input device

40: sound synthesis unit

50: speaker

41 (41-1, 41-2, 41-3, 41-4): original signal output unit (output means)

41a: signal generator (signal generating means)

41b: Multiplier

41c, 43: envelope processing unit

42: adder (synthetic sound generating means)

43: envelope processing unit

Sa: periodic signal

Sb: original signal

Sd: synthesized sound signal

The present invention relates to a sound synthesizing apparatus for generating a signal representing a desired sound by adding a plurality of types of signals, and a storage medium storing a program for causing a computer to function as this sound synthesizing apparatus.

The technique of synthesizing desired sounds, such as a human sound and the performance sound of a musical instrument, has conventionally been proposed. The sound synthesis method by CSM (Composite Sinusoidal Modeling) (hereinafter referred to as "CSM sound synthesis method") is one of the methods widely used in this kind of technique (for example, refer patent document 1). According to this method, the crest value yt of a signal representing a desired sound (hereinafter referred to as a "synthetic sound signal") is expressed as a sum of a plurality of sinusoids having different angular frequencies and amplitudes, respectively, as expressed by Equation 1 below. .

In formula (1), "ai (i is an integer satisfying 1≤i≤n)" and "ωi" are the amplitude and angular frequency of the ith sine wave, respectively. In addition, "t" is an integer indicating time, and "n" has shown the number of sine waves which should be added (the so-called CSM order).

Fig. 7 is a block diagram showing the configuration of an apparatus for synthesizing sounds using this CSM sound synthesizing method. As shown in FIG. 7, the sound synthesizing apparatus has a sound synthesizing unit 70 and a control unit 80. Among these, the sound synthesizing unit 70 includes n sinusoidal wave output units 71 (71-1, 71-2, 71-3, and 71-4, each of which generates and outputs a sinusoidal wave). ), An adder 72 that adds and outputs an output signal from each sinusoidal wave output unit 71, and an envelope processor 73 that multiplies a specific envelope by a signal output from the adder 72 and then outputs it as a synthesized sound signal S. ). Each sinusoidal wave output unit 71 includes a sinusoidal wave generator 71a for generating a sinusoidal wave of the indicated angular frequency and a multiplier 71b for multiplying the amplitude value indicated for the sinusoidal wave. On the other hand, the control device 80 shown in FIG. 7 instructs the sine wave generator 71a and the multiplier 71b of each sinusoidal wave output unit 71 of the angular frequency and amplitude values corresponding to the contents of the sound to be synthesized. At the same time, the envelope processing unit 73 instructs the time length T (hereinafter, referred to as a "pitch period") T corresponding to the pitch (pitch) of the synthesized sound.

Under this configuration, the four sinusoidal wave generators 71a start the generation of the sinusoidal waves at the start of the start of the pitch period T as shown in FIGS. 8A to 8D. That is, the phase of each sine wave at the start of a pitch period becomes "0" with respect to all the sine wave generators 71a. Then, a signal obtained by multiplying these sinusoids by an amplitude value (hereinafter referred to as "original signal") (Fig. 8 (e)) and an envelope having a time length of pitch period T (Fig. 8 (f)) ) Is multiplied by the envelope processing unit 73, whereby a synthesized sound signal S showing a waveform in Fig. 8G is obtained. 9A and 9B are diagrams showing waveforms and spectrograms of the synthesized sound signal S, respectively. That is, in FIG. 9A, the horizontal axis represents time, and the vertical axis represents signal strength. In Fig. 9B, the horizontal axis represents time, the vertical axis represents frequency, and the intensity of color represents the distribution of the intensity of the signal.

<Patent Document 1>

Japanese Patent Laid-Open No. 11-231875 (especially page 3 and Fig. 1)

 However, the synthesized sound signal S obtained under the configuration shown in FIG. 7 is biased toward one side (here "+" side) on the basis of the level of signal "0" as shown in FIG. In addition, as shown in Fig. 9B, a high-frequency noise component is prominent in the vicinity of the starting point of the pitch period T. And the sound generated based on such a signal has a problem that it becomes annoying to an ear including noise. On the other hand, it is also conceivable to perform various filter processes on the synthesized sound signal S in order to suppress the bias of the signal strength and the noise component. However, in this case, it is necessary to separately install a filter in addition to the configuration for obtaining the synthesized sound signal S, which may cause a problem of increasing throughput and complicated configuration.

The present invention has been made in view of the above circumstances, and an object thereof is to provide a sound synthesizing apparatus capable of synthesizing natural sounds with a simple configuration, and a storage medium storing a program for functioning a computer as a musical synthesizing apparatus. Doing.

As described above, the synthesized sound signal S obtained by the configuration shown in FIG. 7 is biased to one side based on the level of the signal "0", and further includes noise near the starting point of the pitch period. do. The inventors of the present application have found that one of the causes of the synthesized sound signal S being a signal having such a property is that all the original signals start to increase simultaneously immediately after the start of the pitch period.

That is, since all the original signals start increasing simultaneously at the start of the pitch period, the waveform of the synthesized sound signal changes rapidly and discontinuously at the boundary of each pitch period. More specifically, as shown in Fig. 9 (c) in which Fig. 9A is enlarged in the time axis direction, the waveform of the synthesized sound signal becomes discontinuous at the start of the pitch period. As a result of this discontinuity, the synthesized sound signal contains noise at the start of the pitch period.

In addition, the waveform of the envelope is generally maximized immediately after the start of the pitch period in which all the original signals increase simultaneously, but then attenuates. For this reason, in the synthesized sound signal multiplied by the envelope and the signal obtained by adding all the original signals, the integral value of the portion that becomes "+" based on the level "0" is compared with the integral value of the portion that becomes "-". It becomes bigger. Originating from the unevenness of this integrated value, the signal strength of the synthesized sound signal is biased to one side.

The present invention has been made on the basis of this knowledge, and includes a plurality of output means for outputting every pitch period that is a time length corresponding to the pitch of the synthesized sound that should generate an original signal whose level varies periodically, and an output from the plurality of output means. Synthesized sound generating means for generating a synthesized sound signal representing a synthesized sound by adding the original signal, and means for indicating the original signal to be output by the output means to each of the plurality of output means, wherein a part of the plurality of output means is provided. Instructing each of the output means such that the level of the original signal output from the output means of the signal increases immediately after the start of the pitch period, while the level of the original signal output from the other output means decreases immediately after the start of the pitch period. It characterized in that it comprises an instruction means for giving.

Under this configuration, the indicating means instructs each output means of the form of the original signal so that the increase or decrease of the level of the original signal immediately after the start of the pitch period is different for each of the one or more output means. That is, the situation where all the original signals start increasing simultaneously immediately after the start of the pitch period is avoided. Therefore, according to the present invention, a natural sound can be obtained by suppressing the bias of the signal intensity and the noise for every pitch period, without the need for filter processing for the synthesized sound signal or the like.

In the present invention, the following configuration can be considered, for example, as a configuration for making the increase and decrease of the level immediately after the start of the pitch period different from the original signal output from some output means and the original signal output from another output means. have. That is, the instructing means instructs each output means to instruct the phase of the original signal so that the phase at the start of the pitch period is different from the original signal output from some output means and the original signal output from the other output means. It can be adopted. In addition, under the configuration in which each output means multiplies an amplitude value by a signal whose level changes periodically, and outputs the signal obtained thereby as an original signal, the indicating means outputs the output to the output means different from some of the output means. As an amplitude value provided to the multiplication in a means, you may employ | adopt the structure which respectively instructs the amplitude value from which a code differs. Alternatively, each output means has a time length corresponding to the pitch period and an envelope representing a temporal change in the amplitude value of the original signal is reflected in the signal obtained by multiplying the amplitude value, and the signal obtained thereby is reflected in the original signal. Under the configuration of outputting as a configuration, the indicating means may be configured to indicate envelopes having different signs of the amplitude values respectively indicated by the output means and the other output means.

When the plurality of output means respectively outputs original signals having different angular frequencies, one or more output means corresponding to the odd number are counted starting from the smaller one of the plurality of output means. It is preferable to set it as an output means, and to use the 1st or more output means corresponding to even number as said other output means.

In addition, each output means includes signal generating means capable of generating a plurality of kinds of signals having different waveforms, and in addition, the indicating means under the configuration of outputting the original signal based on the signal generated by the signal generating means. It is good also as a structure which instructs each output means of any one of the said several types of signal as a signal which the signal generation means of the said output means should generate | occur | produce. According to this configuration, since the original signal is output based on any one of a plurality of types of signals, the sound quality (tone) of the synthesized sound obtained thereby can be various. In this configuration, when the indicating means instructs each output means of a signal selected by the user from among a plurality of types of signals as a signal generated by the signal generating means of the output means, the user can obtain the desired synthesized sound. have.

The present invention is also specified as a program for making a computer function as the sound synthesizing apparatus according to the present invention. This program may be provided to a computer via a network, or may be provided in a form stored in a recording medium represented by an optical disk and installed in the computer.

Embodiment of the Invention

EMBODIMENT OF THE INVENTION Hereinafter, the Example of this invention is described with reference to drawings.

<A: Configuration of Example>

1 is a block diagram showing the configuration of a sound synthesizing apparatus according to an embodiment of the present invention. As shown in FIG. 1, the sound synthesizing apparatus 100 includes a control device 10, a storage device 20, an input device 30, a sound synthesizing unit 40, and a speaker 50. Have Among them, the memory device 20, the input device 30, and the sound synthesizing unit 40 are connected to the control device 10 via the bus 11, respectively. In addition, the speaker 50 is connected to the sound synthesizer 40.

The control device 10 is a device for controlling the entire sound synthesizing device 100. Specifically, the control device 10 includes a CPU (Central Processing Unit) that performs control and various arithmetic operations of each unit by executing a program, a ROM (Read Only Memory) in which a program executed by the CPU is stored; And a random access memory (RAM) used by the CPU as a work area.

The storage device 20 is a means for storing a program executed by the control device 10 and data used at the time of execution thereof. For example, various devices such as a hard disk device or an optical disk device can be employed as the storage device 20. The memory 20 stores a program (hereinafter, referred to as a "sound synthesis program") for causing the sound synthesis unit 40 to synthesize sounds. The control device 10 functions as a means for supplying the sound synthesizing section 40 with various instructions related to the synthesis of sounds by executing this sound synthesizing program.

The input device 30 includes a pointing device such as a mouse, a keyboard for inputting characters or symbols, etc., and outputs a signal corresponding to an operation by a user to the control device 10. By operating the input device 30, the user can appropriately select, for example, pitch (pitch) of sounds to be synthesized, waveforms of signals to be provided for sound synthesis, and the like.

The sound synthesizing unit 40 is a means for generating and outputting a synthesized sound signal from a plurality of original signals in response to an instruction given from the control device 10. The speaker 50 outputs the sound corresponding to the synthesized sound signal output from the sound synthesis unit 40. In addition, although the speaker 50 was illustrated as an apparatus for outputting sound here, you may install the earphone and headphones attached to a user's ear instead.

2 is a block diagram showing a specific configuration of the sound synthesizing section 40. As shown in Fig. 2, the sound synthesizer 40 includes a plurality of original signal output units 41 (41-1, 41-2, 41-3, and 41-4), an adder 42, and an envelope processing unit. Has 43. In the CSM sound synthesis method, the original signal output unit 41 is provided by the number corresponding to the number of signals to be added (that is, the CSM order n). In the present embodiment, however, it is assumed that four original signal output units 41 are provided. In addition, below, when each original signal output unit 41 is distinguished and described specifically, it will be described as "the original signal output unit 41-i" using the variable i.

These original signal output units 41 are means for generating and outputting the original signal Sb having different angular frequencies and amplitude values, respectively. Each original signal output unit 41 has a signal generator 41a and a multiplier 41b. Among these, the signal generator 41a generates and outputs a signal Sa (hereinafter referred to as a "cycle signal") whose level varies periodically. The signal generator 41a in this embodiment has a function of selectively generating any one of a plurality of kinds of signals having different waveform shapes, such as sinusoidal wave, triangular wave, and square wave, as the periodic signal Sa. Specifically, the signal generator 41a includes a memory in which waveform data indicating waveforms for one cycle of each type of signal is stored in advance. The signal having a specific waveform is generated by successively continually sequencing the waveform indicated by any one waveform data. On the other hand, the multiplier 41b multiplies the periodic signal Sa output from the signal generator 41a by an amplitude value and outputs the original signal Sb.

The adder 42 adds the original signals Sb output from the four original signal output units 41, and outputs the signal Sc thus obtained. The envelope processor 43 is a means for changing the envelope of the amplitude value in the signal Sc output from the adder 42. That is, the envelope processor 43 includes an envelope generator 43a for generating an envelope indicating a temporal change in the amplitude value, and multiplies the envelope generated thereby by the signal Sc output from the adder 42 to synthesize the sound. Output as signal Sd.

<B: Operation of Example>

When a predetermined operation is performed on the input device 30 by the user, the control device 10 reads out the sound synthesis program stored in the storage device 20 into the RAM and then executes it sequentially. The sound synthesis operation accompanying execution of this sound synthesis program will be described below.

The user can select the kind of periodic signal Sa which each signal generator 41a should generate | occur | produce by performing a predetermined | prescribed operation to the input device 30 before sound synthesis starts. Upon detecting this operation, the control device 10 outputs data (hereinafter referred to as "waveform selection data") Ds indicating the type of the selected signal to the signal generator 41a of each original signal output unit 41. On the other hand, each signal generator 41a specifies the signal which the signal generator 41a should generate | occur | produce by this waveform selection data Ds. Further, the user can select the type of the periodic signal Sa output from the signal generator 41a at any point in time where sound synthesis is performed. Each time this operation is made, waveform selection data Ds indicating the type of the selected signal is output from the control device 10 to the respective signal generators 41a, and the type of the periodic signal Sa that should be output from these signal generators 41a is specified. Will be.

On the other hand, when a predetermined operation is made by the user to the input device 30 to give an instruction to start sound synthesis, the control device 10 instructs each signal generator 41a to start signal generation. In addition, the control device 10 calculates and outputs a frame parameter corresponding to the content of the sound to be synthesized for each period having a predetermined length of time (for example, about 5 ms to about 30 ms) and outputs it to the sound synthesis section 40. As shown in Fig. 2, the frame parameters include the angular frequencies ω i (ω 1, ω 2, ω 3 and ω 4), initial phase pi (p 1, p 2, p 3 and p 4), and amplitude values a i (a 1, a 2, a 3 and a 4). , And pitch period T. The pitch period T is a time length corresponding to the pitch of the sound to be synthesized, and is supplied to the envelope processor 43. In addition, the angular frequency ω i and the initial phase pi are supplied to the signal generator 41a of each original signal output unit 41. That is, the angular frequency ω1 and the initial phase p1 are directed to the signal generator 41a of the original signal output unit 41-1, and the angular frequency ω2 and the initial phase are directed to the signal generator 41a of the original signal output unit 41-2. The phase p2 is indicated. The angular frequency ω i represents each frequency of the periodic signal Sa that the signal generator 41a of the original signal output unit 41-i should output. In addition, in this embodiment, the angular frequency ω1 supplied to the signal generator 41a of the original signal output unit 41-1 is minimum, and is set to a large value as it leads to ω2, ω3, and ω4. On the other hand, the initial phase pi represents the phase at the start of the pitch period among the periodic signals Sa that the signal generator 41a of the original signal output unit 41-i should output. The amplitude value ai is an amplitude value that the multiplier 41b should multiply the signal output from the signal generator 41a, and is supplied to the multiplier 41b of each original signal output unit 41. For example, an amplitude value a1 is indicated to the multiplier 41b of the original signal output unit 41-1, and an amplitude value a2 is indicated to the multiplier 41b of the original signal output unit 41-2.

The sound synthesizer 40 reflects the value of the frame parameter in the synthesized sound each time the start of the pitch period arrives. Here, in FIG. 3A, the timing at which the frame parameter is supplied is shown by a downward arrow. When the start time of the pitch period T arrives, the sound synthesizing section 40 is configured to reflect the frame parameter supplied immediately before the synthesized sound. That is, only the frame parameters supplied at the timing indicated by "0" among the frame parameters sequentially supplied at the timing shown in Fig. 3A affect the synthesized sound. 3A illustrates the case where the time interval at which the frame parameter is supplied is shorter than the time length of the pitch period T. As shown in FIG. However, the time interval to which this frame parameter is supplied is a time length predetermined corresponding to the content of the sound to be synthesize | combined, and may become a time length longer than pitch period T.

On the other hand, in parallel with the output of the frame parameter by the control apparatus 10, each original signal output unit 41 generates and outputs an original signal corresponding to the frame parameter. That is, the signal generator 41a of each original signal output unit 41 outputs the periodic signal Sa having the angular frequency ω i indicated as the frame parameter as a signal of the kind specified by the waveform selection data Ds. The output operation of this periodic signal Sa is performed every pitch period T. FIG. That is, each signal generator 41a starts outputting the periodic signal Sa from the starting point of the pitch period T. Further, each signal generator 41a sets the phase of the periodic signal Sa at the start of the pitch period to the initial phase pi indicated as the frame parameter. The periodic signal Sa output from each signal generator 41a is multiplied by the amplitude value ai in the multiplier 41b and then output as the original signal Sb.

In the present embodiment, the odd original signal output units 41-1 and 41-3 (hereinafter, simply referred to as "odd circles" are counted starting from the smallest of the angular frequencies? I indicated among the four original signal output units 41; The initial phases p1 and p3 instructed by the &quot; signal output unit 41 &quot; are set to &quot; 0 &quot;. In contrast, the even-numbered original signal output units 41-2 and 41-4 (hereinafter, simply referred to as "even-numbered original signal output units" are counted starting from the smallest frequency ω i of the four original signal output units 41. 41) ", the initial phases p2 and p4 are set to" (pi) ". 4 is a timing chart showing a change in phase of the periodic signal Sa in each original signal output unit 41. In FIG. 4, the horizontal axis represents time, and the vertical axis represents the phase of each periodic signal Sa. As shown in Figs. 3 and 4, the periodic signal Sa in the odd-numbered original signal output unit 41 has its phase updated to &quot; 0 &quot; The phase signal Sb in the original signal output unit 41 in is updated at a phase of &quot; π &quot; each time the start point of the pitch period arrives. As a result, the level of the original signal Sb output from the odd-numbered original signal output unit 41 increases immediately after the start of each pitch period, while the level of the original signal Sb output from the even-numbered original signal output unit 41 is increased. The level decreases immediately after the start of each pitch period (see Figure 3).

On the other hand, the original signal Sb output from the four original signal output units 41 is added by the adder 42 and then supplied to the envelope processing unit 43 as a signal Sc. The envelope processor 43 multiplies the envelope generated by the envelope generator 43a by the signal Sc, and outputs the signal obtained as a synthesized sound signal Sd. Here, the envelope generator 43a generates an envelope having a time length equal to the pitch period T instructed from the control device 10 as a frame parameter. Then, the speaker 50 outputs the synthesized sound based on the synthesized sound signal Sd output from the envelope processing unit 43.

Thus, in this embodiment, the original signal Sb output from some of the four original signal output units 41 (the original signal output units 41-1 and 41-3) increases immediately after the start of the pitch period. The other original signals (the original signals from the original signal output units 41-2 and 41-4) are to be decreased immediately after the start of the pitch period. That is, the situation where all original signals increase (or decrease) simultaneously immediately after the start of the pitch period is avoided. As a result, according to the present embodiment, natural synthesized sound can be obtained by suppressing the noise at the start of the pitch period and the amplitude of the amplitude value of the signal intensity shown in FIG. This point will be described in detail with reference to FIG. 5.

5A is a graph showing the waveform of the synthesized sound signal Sd output from the envelope processor 43, and FIG. 5B is a spectrogram of this signal Sd. In FIG. 5A, the horizontal axis represents time, and the vertical axis represents signal strength. On the other hand, in Fig. 5B, the horizontal axis represents time, the vertical axis represents frequency, and the intensity of color represents the distribution of the intensity of the signal (the brighter portion is the greater of the signal). As can be clearly seen from comparing FIG. 5A with FIG. 9A, in the present embodiment, the signal intensity is equal to both the "+" side and the "-" side on the basis of the level "0". Is distributed. This is because the bias of the intensity of the signal toward the "+" side caused by the increase of the original signal Sb output from the odd-numbered original signal output unit 41 immediately after the start of the pitch period, and the even-numbered original signal output unit ( It is considered that the bias of the intensity of the signal toward the &quot;-&quot; side caused by the decrease of the original signal Sb outputted from 41 immediately after the start of the pitch period is canceled out. In addition, as shown in Fig. 5B, the synthesized sound signal Sd in the present embodiment is compared with the conventional synthesized sound signal S as shown in Fig. 9B, at the start of the pitch period. High frequency components (noise) are being reduced. This is also apparent from the fact that the waveform of the synthesized sound signal is continuous at the start of the pitch period, as shown in FIG. 5 (c) in which FIG. 5A is enlarged in the time axis direction. As described above, according to the present embodiment, a natural synthesized sound can be obtained by suppressing noise at the start of the pitch period or the bias of the signal shown in Fig. 9, and at the start of the bias of the signal strength or the start of the pitch period. No filter processing is necessary to suppress noise in the system.

Further, in the present embodiment, since any one of a plurality of kinds of signals having different waveforms is selected and output as the periodic signal Sa, the sound quality (particularly the timbre) of the synthesized sound obtained based on this can be diversified. In addition, since any one of these plural kinds of signals is selected by the user, a synthesized sound having a sound quality desired by the user can be obtained.

<C: Variation>

The embodiment described above is merely an example, and various modifications can be made to this embodiment without departing from the spirit of the present invention. As a specific modification, the form described below can be considered, for example.

<C-1: Modification Example 1>

In the said embodiment, although the structure which made initial phase pi into "0" or "(pi)" was illustrated, the value of initial phase pi is not limited to this. That is, the bias of the intensity of the signal toward the "+" side caused by the increase of the original signal output from the odd-numbered original signal output unit 41 immediately after the start of the pitch period, and the even-numbered original signal output unit 41 The bias of the intensity of the signal toward the "-" side due to the decrease in the original signal output from the signal immediately after the start of the pitch period is canceled, and the intensity of the signal is evenly distributed to both sides based on the level "0". Preferably, the value of each initial phase pi is appropriately selected.

In the above embodiment, the configuration for controlling the phase of each original signal at the start of the pitch period is exemplified, but the configuration for avoiding the situation in which all the original signals increase simultaneously at the start of the pitch period is limited to this. It doesn't work. Instead of this configuration, for example, a configuration described below can be adopted.

(1) Form 1

The sign of the amplitude value indicated to the odd-numbered original signal output unit 41 and the sign of the amplitude value indicated to the even-numbered original signal output unit 41 may be different. For example, in the structure shown in FIG. 2, the code | symbol of amplitude values a1 and a3 is made into "+", and the code of amplitude values a2 and a4 is made into "-". Also in this configuration, since the phase difference between the original signal from the odd-numbered original signal output unit 41 and the original signal from the even-numbered original signal output unit 41 is substantially shifted by "π", each circle The waveform of the signal becomes the same as the waveform shown in Fig. 3B. Thus, the same effects as in the above embodiment can be obtained.

(2) Form 2

The signal output from the multiplier 41b of the odd-numbered original signal output unit 41 among the four original signal output units 41 and the signal output from the multiplier 41b of the even-numbered original signal output unit 41. May be configured to output an original signal after multiplying an envelope having a different code. That is, as shown in FIG. 6, an envelope processing unit 41c is provided in each of the four original signal output units 41 to multiply the envelope instructed by the control device 10 to the output signal from the multiplier 41b. do. Specifically, the envelope processor 41c of the odd-numbered original signal output unit 41 rises to the "+" side from the start point of the pitch period, then decreases to "0" at the end point of the pitch period. Leading envelope is used. On the other hand, in the envelope processor 41c of the even-numbered original signal output unit 41, the envelope is lowered to the "-" side at the start of the pitch period, and then increased to use the envelope that reaches "0" from the end of the pitch period. do. Therefore, the original signal output from the odd-numbered original signal output unit 41 increases immediately after the start of the pitch period, while the original signal output from the even-numbered original signal output unit 41 immediately after the start of the pitch period. Will decrease. That is, since the situation where all the original signals increase simultaneously immediately after the start of the pitch period is avoided, the same effect as in the above embodiment can be obtained.

As described above, in the present invention, it is sufficient that the configuration of the source signal of some of the plurality of original signals increases immediately after the start of the pitch period, while the level of the other original signals decreases immediately after the start of the pitch period. The configuration for setting the level in this manner is irrelevant.

<C-2: Modification 2>

In the above embodiments and modifications, the sound synthesizing section 40 exemplifies the configuration having four original signal output units 41, but the number of the original signal output units 41 is not limited to this. As a result, the plurality of original signal output units 41 may be provided in the sound synthesizing section 40.

In the above embodiment, the odd-numbered original signal output unit 41 and the even-numbered original signal output unit 41 are counted starting from the smallest frequency of the original signal among the plurality of original signal output units 41. Although the structure which makes the original signal increase and decrease immediately after the start of a pitch period differs was illustrated, the method of division | segmentation of the original signal output unit 41 is arbitrary. For example, when there are four original signal output units 41, the pair which consists of the 1st and 4th original signal output units 41, and the 2nd and 3rd original signals It is good also as a structure which divides into the group which consists of the output units 41, and changes the original signal immediately after the start of a pitch period with respect to both groups. Alternatively, one original signal output unit 41 and the other original signal output unit 41 may be divided so as to have a configuration in which both increase and decrease immediately after the start of the pitch period of the original signal. As a result, one or more original signal output units 41 and the other one or more original signal output units 41 among the plurality of original signal output units 41 are different from each other in the original signal immediately after the start of the pitch period. It is sufficient if it is a structure.

<C-3: Modification Example 3>

In the above embodiment and each modification, the case where the sound synthesizing section 40 is constituted by a DSP is illustrated, but means for outputting an original signal by cooperation of hardware such as a CPU and a program executed by the CPU (circle) The signal output unit 41 or the original signal may be added to generate a synthesized sound signal (adder 42).

As described above, according to the present invention, natural sounds can be synthesized by a simple configuration.

Claims (11)

A plurality of output means for outputting an original signal whose level changes periodically, at every pitch period corresponding to a time length according to pitch of synthesized sound to be generated; Synthesized sound generating means for generating a synthesized sound signal representing a synthesized sound by adding original signals outputted from the plurality of output means; Means for instructing the original signal to be output by the corresponding output means to each of the plurality of output means, wherein the level of the original signal output from the output means of some of the plurality of output means increases immediately after the start of the pitch period; Instructing means for instructing each of the output means so that the level of the original signal output from the other output means decreases immediately after the start of the pitch period. Sound synthesizing apparatus comprising a. The method of claim 1, The instructing means is configured such that the original signal outputted from the partial output means differs from the original signal outputted from the other output means so that the phase at the start of the pitch period is different from each other. Sound synthesizing apparatus characterized by indicating the phase. The method of claim 1, Each output means multiplies an amplitude value by a signal whose level changes periodically, and outputs the signal obtained thereby as the original signal, And a sign different from the amplitude value for the partial output means and the amplitude value for the other output means. The method of claim 1, Each said output means has the time length corresponding to the said pitch period, and reflects the envelope which shows the temporal change of the amplitude value of the said original signal to the signal whose level changes periodically, and reflects the signal obtained by this Output as original signal, And said instructing means instructs, to said partial output means and said other output means, envelopes having different signs of amplitude values, respectively. The method according to any one of claims 1 to 4, The plurality of output means outputs original signals each having a different frequency. The partial output means is one or more output means corresponding to an odd number counting each frequency of the original signal to be output among the plurality of output means from a smaller one, And said other output means is at least one output means corresponding to an even number, counting each frequency of an original signal to be output among said plurality of output means from a smaller one. The method of claim 5, And a phase difference between the angular frequencies of the original signals output from the odd-numbered output means and the angular frequencies of the original signals output from the even-numbered output means is π at the start of the pitch period. The method according to any one of claims 1 to 4, Each of the output means includes signal generating means capable of generating a plurality of kinds of signals having different waveforms, and outputs the original signal based on the signal generated by the signal generating means, And the instructing means instructs each of the output means any one of the plurality of types of signals as a signal generated by the signal generating means of the output means. The method of claim 7, wherein And said instructing means instructs each of said output means as a signal that said signal generating means of said output means should generate a signal selected by a user from among said plurality of types of signals. The method of claim 5, Each of the output means includes signal generation means capable of generating a plurality of types of signals having different waveforms, respectively, and outputs the original signal based on the signal generated by the signal generation means, And the instructing means instructs each of the output means any one of the plural kinds of signals as a signal generated by the signal generating means of the output means. The method of claim 9, And said instructing means instructs each of said output means as a signal that said signal generating means of said output means should generate a signal selected by a user from among said plurality of types of signals. Computer, A plurality of output means for outputting an original signal whose level changes periodically at every pitch period corresponding to the length of time according to the pitch of the synthesized sound to be generated; Synthesized sound generating means for generating a synthesized sound signal representing a synthesized sound by adding original signals outputted from the plurality of output means; Means for indicating an original signal to be output by the corresponding output means to each of the plurality of output means, wherein the level of the original signal output from the output means of some of the plurality of output means increases immediately after the start of the pitch period; Instructing means for instructing each of the output means so that the level of the original signal output from the other output means decreases immediately after the start of the pitch period. A computer-readable storage medium storing a program for functioning as a computer.

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