JP3334502B2 - Waveform memory type sound generator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a waveform memory type tone generator for reading out waveform data stored in a waveform memory and generating a musical tone in an electronic musical instrument or the like.

[0002]

2. Description of the Related Art Conventionally, as a sound source device of this type, waveform data, which is a time-series sampling value of an original sound waveform, is stored in a waveform memory. An F number which is a ratio (pitch ratio) is determined, and the accumulated value of the F number is used as a read address to sequentially read and reproduce waveform data at the same frequency as the sampling frequency.

[0003] Thus, a tone signal can be generated by changing the pitch even with one kind of original waveform waveform data, so that it is not necessary to store all waveform data of a required pitch, and the capacity of the waveform memory can be reduced. it can. Note that the read address obtained by accumulating the F number is generally a decimal value,
Since the waveform data corresponding to the read address of the decimal value is not stored, the corresponding waveform data is actually generated by interpolation based on the waveform data near the read address.

The waveform data includes, for example, waveform data of an attack portion corresponding to the rise of a musical tone and waveform data of a so-called loop portion obtained by cutting out a part of a sustain portion corresponding to a sustained tone. In some cases, high-quality and long-duration musical sound waveforms can be generated by a small-capacity waveform memory by repeatedly reading out the waveform data of the attack part and then repeatedly reading out the waveform data of the loop part.

Since the tone of a natural musical instrument has a slightly different waveform even if the pitch is different even for the same kind of tone, for example, a keyboard-type electronic musical instrument uses a plurality of sets of waveform data corresponding to a plurality of ranges, that is, a key range for one tone. There is also a technique for selecting waveform data according to the key range of a depressed key.

[0006]

By the way, in an electronic musical instrument, a portamento that continuously changes the pitch between two pitches, a pitch bend that continuously modulates the pitch of a musical tone in response to the operation of an operating element, and the like. There is a technology called.
In this case, F is changed according to the operation amount of the pitch bend operation element or the like.
A pitch change can be obtained by changing the number.However, if only the pitch is changed with the waveform data selected at the start of sounding, the sound quality becomes unnatural, and aliasing noise occurs in the high frequency range and harmonics occur in the low frequency range. Problems such as dropping of components occur. For this reason, it is necessary to switch the loop portion of the waveform data according to the pitch by using a plurality of waveform data corresponding to a plurality of tone ranges.

[0007] However, when switching such a loop portion, click noise occurs unless the phases at the time of switching are matched. Therefore, it has been considered that the start address and the end address of the loop portion are made to coincide with the zero-cross position of the waveform, and the loop portion is connected at the zero level. However, there is a problem in taking the timing of switching and performing address control. Therefore, a mechanism for controlling by the CPU has not been considered. For example, an address counter that operates at a timing independent of the CPU clock is represented by C
It was difficult to control from PU. Further, it has been difficult to sequentially connect a plurality of loop waveforms having different sampling numbers.

SUMMARY OF THE INVENTION It is an object of the present invention to simplify switching control of a loop portion in response to a change in pitch of a musical tone in a waveform memory type tone generator.

[0009]

According to the present invention, there is provided a waveform memory type sound source device in which a plurality of banks corresponding to each of a plurality of sound ranges are set, and the waveform data having a loop portion is waveform data corresponding to the sound ranges. Is stored for each bank corresponding to the range , and the loop section has the same relative address.
The phase of the waveform corresponding to the
The higher the range corresponding to the bank, the higher the loop
Reduce the size of the loop and the size of the loop for each bank
A waveform memory storing at different, and pitch data generating means for generating pitch data that changes temporally in 1 pronounce musical tone corresponding to the pitch of the tone to be generated, with the pitch data generating means Bank determining means for determining a bank to which the generated pitch data belongs; waveform address holding means for holding an absolute address designating the waveform data in the waveform memory; and an absolute address held in the waveform address holding means as a reference. a relative address generating means for generating a relative address for sequentially reading the waveform data of the loop portion in an address width corresponding to the pitch data in accordance with the determination bank by the bank judging means when sound of the loop portion, the waveform address The absolute address of the holding means is updated , and the relative address generating means generates
The relative address to the size of the loop part of the bank.
And a waveform switching unit that scaled, before
When switching the waveform of the loop portion, the waveform switching means
On the other hand, the absolute address and
It is characterized in that only the calling data is set .

[0010]

In the waveform memory type tone generator according to the present invention, a plurality of banks corresponding to a plurality of sound ranges are set in the waveform memory, and waveform data having a loop portion corresponding to these sound ranges is provided. It is stored for each bank corresponding to the range. This loop is the same relative
The phase of the waveform corresponding to the address is the same for each bank
The higher the range corresponding to the bank, the higher the
Loop size to reduce the loop size for each bank.
Are stored differently. The relative address generated by the relative address generating means is for sequentially reading out the loop section waveform data with an address width corresponding to the pitch data based on the absolute address held in the waveform address holding means. The waveform data is read based on the waveform data, and becomes waveform data corresponding to the pitch.
The relative address matches the size of the loop part of the bank.
Scaled.

The waveform data in the waveform memory is specified by an absolute address held in the waveform address holding means. When pitch data corresponding to the pitch of the musical tone to be generated is generated by the pitch data generating means, the bank to which the pitch data belongs is determined by the bank determining means, and the waveform switching means determines the absolute value corresponding to the determined bank. The absolute address of the waveform address holding means is updated by the address. Also, a relative address generating means is generated.
Match the relative address to the size of the loop part of the bank.
And scale. Therefore, the absolute address and
By switching only the calling data , the bank is switched to perform the read control of the waveform memory. C
The PU enables the absolute address to be switched at an arbitrary timing while preventing generation of noise.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A waveform memory type tone generator according to the present invention is such that the loop portion of the waveform data of each bank of the waveform memory is processed so as to have the same phase between the banks from the beginning to the end. Is preferred.

Further, the waveform memory type sound source device of the present invention comprises:
The number of samples of the loop portion differs between the banks of the waveform memory, and the relative address generation unit generates scaling data according to the bank determined by the bank determination unit; And scaling means for generating a relative address scaled according to the scaling data generated by the generating means.

Further, the waveform memory type tone generator of the present invention comprises:
The sampling number of the loop portion of the waveform data of each bank of the waveform memory may be set to be equal between the banks.

Further, the waveform memory type sound source device of the present invention comprises:
The waveform data of the waveform memory may have a one-shot portion which is read out at the start of sound generation prior to the loop portion.

FIG. 3 is a block diagram of a keyboard electronic musical instrument to which the waveform memory type tone generator of the present invention is applied. CPU 1 executes R based on a control program stored in ROM 2.
The entire electronic musical instrument is controlled using the working area of the AM 3, and key processing for generating a normal tone according to the performance operation of the keyboard 4 and panel switch processing according to the operation of the panel switch 5 are performed. The display 6 is formed of a liquid crystal display panel, and displays the type of the tone color (waveform data) currently specified by the display control of the CPU 1.

As will be described in detail later, the sound source 7
The waveform data is read from the waveform memory 8 based on various data input from the PU 1 and a digital tone signal is generated based on the waveform data. The digital tone signal is converted into an analog signal by the D / A converter 9 and a tone is generated by the sound system 10.

The pitch bend wheel 11 is composed of a wheel and an A / D converter. The A / D converter converts an analog signal corresponding to the rotation angle of the wheel into a digital signal at a constant sampling cycle. The timer interrupt signal is output to the CPU 1 every time the signal value is determined. As a result, the CPU 1 performs the timer interrupt event processing at a constant period corresponding to the conversion cycle of the A / D converter, and fetches a bend value corresponding to the pitch modulation amount.

FIG. 2 is a diagram showing a memory map for one timbre of the waveform memory 8. The waveform memory 8 stores waveform data corresponding to various timbres in a format as shown in FIG. Waveform data of one timbre is divided into eight banks (bank 1 to bank 8) corresponding to a one-octave range allocated in order from the lower side of the keyboard 4.
The waveform data of each bank stores waveform data suitable for the pitch of the tone range corresponding to the bank. For example, even if you change the pitch within each range,
The waveform data does not cause aliasing noise or harmonic drop.

Each bank is composed of an attack waveform (one-shot portion) corresponding to the rising portion of the musical tone and a loop waveform (loop portion) corresponding to the sustained portion of the musical tone. Waveform address WA
(Bn) (bn is the bank number) is stored in the ROM 2 at the absolute address of the waveform memory 8, the start address of the attack waveform is the start address SA (bn), and the last address of the loop waveform is the end address. As EA (bn), the waveform address WA (b
The address is stored in the ROM 2 with a relative address from n).
In this embodiment, the range of each bank and the capacity of the loop waveform are set as shown in Table 1 below.

[0021]

[Table 1] One sample of the waveform data corresponds to one word.

FIG. 1 is a block diagram of the sound source 7. The tone generator 7 of this embodiment performs multiplex time division processing of 16 channels.
71h corresponds to 16 channels so that each corresponds to 16 channels.
The other circuits also perform a time-division operation corresponding to each channel. And for this sound source 7,
The CPU 1 assigns a sound by searching for an empty channel or performing a truncation process when generating a musical tone, and registers registers 71 a corresponding to the assigned channels of the control register group 71.
Data is set in .about.71h to generate a musical tone.

The register 71a is set with pitch data PIT of a musical tone to be actually generated which is determined by the keyboard 4 and the pitch bend wheel 11, the register 71b is set with an attack waveform start address SA (relative address), and the register 71c is set. Is set to the final address EA (relative address) of the loop waveform. Further, scaling data SF for scaling the read address according to the bank of the waveform data is set in the register 71d as described later. Also, register 7
The start address WA (absolute address) of the loop waveform is set in 1e, and the note-on data NON is set in the register 71f. The register 71g is set with the musical tone envelope rate ER, and the register 71h is set with the envelope level EL.

An F number generator (FG) 72 generates a ratio between the pitch data PIT of the register 71a and a predetermined waveform pitch as an F number FN. Note that the predetermined waveform pitch is, for example, the pitch of the original waveform of the waveform data of bank 1, and this F number generator 72
The F-number FN itself generated from the above changes with reference to a constant waveform pitch even when the bank is switched.

The address control circuit (AC) 73 has an address counter therein. When an attack waveform start address SA is set in the register 71b, the address SA is set in the address counter, and the F number generator 72 Output the F number FN from the
Number FN is used as the start address SA by the address counter.
And outputs the accumulated value, that is, the address count value as a relative address, and also outputs address data for performing interpolation. Then, when the address count value reaches the end address EA of the loop waveform (in most cases, when the address exceeds the end address EA), the loop size (= EA) is subtracted from the current count value, and the value is stored in the address counter. Set and repeat the accumulation of F number FN. The address count value (relative address) output from the address control circuit 73 is supplied to a scaler (SC) 74.

The scaler 74 is a circuit for scaling the address count value in accordance with the loop waveform capacity of each bank. In this embodiment, the scaler 74 is constituted by a shifter as shown in FIG. That is, as described above, the F-number FN itself generated from the F-number generator 72 changes based on a constant waveform pitch (the pitch of the original sound waveform of bank 1) even when the bank is switched. As described above, in this embodiment, the capacity of the waveform
/ 2, the address control circuit 73
Is scaled by 1/2 in accordance with the capacity of the waveform of the bank.

Such an operation of halving can be easily executed by shifting the address count value by one bit with a shifter, and the scaler 74 is supplied with shift data SF designating the shift amount. You. Note that the shift data SF is a value corresponding to each bank as shown in Table 2 below, and indicates the number of shift stages of the shifter. As a result, every time the bank is switched to the higher register side, 1 /
That is, the interval between addresses output to the waveform memory 8 matches the capacity of the loop waveform.

[0028]

[Table 2]

The adder 75 has a waveform address WA (start address of the loop waveform) set in the register 71e.
(Absolute address) is added to the integer part of the address count value output from the scaler 74, and the added value is output as the actual access address of the waveform memory 8. From the waveform memory 8, samples for a plurality of points before and after the access address are output for interpolation calculation.

An interpolation circuit (IP) 76 interpolates the waveform data based on the waveform data read from the waveform memory 8 and the decimal part of the address count value output from the scaler 74, and interpolates the interpolated waveform data. Is output to the multiplication circuit 77.

The envelope generator (EG) 78
Is based on the envelope rate ER of the register 71g and the envelope level EL of the register 71h.
An envelope value for controlling a change in the volume of the musical tone from the start of generation of the musical tone according to the note-on to the end of the tone generation of the musical tone is generated and output to the multiplication circuit 77. The envelope value is multiplied by the waveform data from the interpolation circuit 76 by the multiplication circuit 77.

The envelope-added waveform data is output to an accumulator (ACC) 79. The accumulator 79 accumulates the 16-channel waveform data and outputs the accumulated data as a tone signal every cycle. I do.

FIG. 5 is a flowchart of a main routine of a control program processed by the CPU 1, FIG. 6 is a flowchart of a note-on event process, and FIG. 7 is a flowchart of a timer interrupt event process. The operation of the embodiment will be described. In the following description and each flowchart, each register and the like are represented by the following labels, and their storage contents are represented by the same label unless otherwise specified.

I: register of the channel number of the tone generation assigned channel in the tone generator 7 NN: register of the note number for which the tone is instructed NN (i): register of the note number of the i channel PB: register of the bend value of the pitch bend wheel PIT ( i): i-channel pitch data register bn (i): i-channel determined bank number register

When the processing of the main routine of FIG. 5 is started by turning on the power, initialization such as resetting of each register is performed in step S1, and the note-on event processing of FIG. Key processing such as sound processing, and panel switch processing such as tone setting performed by detecting operation of the panel switch 5 in step S3.
It returns to step S2.

The note-on event process of FIG. 6 is a process corresponding to one key-on event. First, in step S11, the note number of the key having the key-on event is stored in the register NN and the current bend value is stored in the register NN. In step S12, a sound is assigned to a channel that determines one of a plurality of channels of the sound source 7 as a new tone generation channel, and the channel number of the assigned channel is stored in the register i ( 1 ≦ i ≦ 16).

Next, in step S13, pitch change processing of the note number NN is performed based on the bend value PB, pitch data of a pitch to be generated is stored in the register PIT (i), and the control register group 71 of the tone generator 7 is controlled. The pitch data is set in the i channel of the above, the bank is determined in step S14 according to the pitch PIT (i), and the bank number of the determined bank is stored in the register bn (i).

Next, in steps S15 to S18, data is set for the i channel of the control register group 71 of the sound source 7. First, in step S15, the waveform address WA, start address SA, and end address EA of the waveform data of the bank indicated by the bank number bn (i) are set in the i channel, and in step S16, the scaling data SF of the i channel is set. In step S17, other data of the i-channel (envelope data ER
) Is set, and in step S18, note-on data NON is transmitted to the i channel to issue a sound generation instruction. And
In step S19, the current note number NN is stored in the register N.
N (i) and the process ends.

With the above processing, the pitch data PIT (i), the waveform address WA, the start address S
A, end address EA, scaling data SF, note-on data NON, envelope rate ER and level EL are set, and register bn (i)
Holds the bank number of the bank determined to be the i-channel, and the register NN (i) holds the note number of the i-channel.

The timer interrupt event process of FIG. 7 is started in the conversion cycle of A / D conversion in the pitch bend wheel 11, and in step S21, the pitch bend wheel 11
Is stored in the register PB. In step S22, the register i of the channel number for channel management is set to "1", and the determination processing in step S28 and the increment of the register i in step S29 result in steps S23 to S27 for channels 1 to 16. Repeat the process.

In step S23, pitch fluctuation processing of the note number NN (i) is performed based on the bend value PB.
The pitch data of the pitch to be generated is stored in the register PIT (i).
The pitch data is set in the sound source 7 and it is determined in step S24 whether or not the current channel i is a loop portion (when a loop waveform is reproduced). If the current channel i is a loop portion, the process proceeds to step S25. If it is not the loop section, the bank switching is not performed, and the process directly proceeds to step S28.

In step S25, the bank is determined according to the pitch PIT (i), and the bank number of the determination result is stored in the register bn (i). In step S26, the bank number bn is determined.
(i) It is determined whether or not there has been a change. Bank number bn
If there is no change in (i), there is no need to switch the bank, so the process proceeds to step S28. If there is a change in bank number bn (i), it is necessary to switch the bank.
At 27, the waveform address WA and the scaling data SF of the waveform data of the bank indicated by the bank number bn (i) are set in the i channel of the control register group 71 of the tone generator 7, and the process proceeds to step S28. As described above, the processing is completed for all the channels, and in step S28, i = 16
Then, the process returns to the original routine.

With the above processing, the pitch PIT (i) that changes according to the bend data PB input in real time
, The waveform address WA is rewritten and the bank is switched to the waveform data specified by the waveform address WA when the range of the pitch to be sounded, that is, the bank changes. The waveform data in the waveform memory 8 is a waveform address WA
The waveform data is read out at a relative address based on the reference, and when the loop portion of the two banks is read out at one relative address, the phase of the loop portion is read out so that samples of the same phase of each loop portion are read out. However, they are aligned between different banks. Therefore, even if the current read position is in the middle of the loop waveform, when the waveform address WA is rewritten, regardless of the current value of the relative address,
Waveform switching is performed in real time without generating large noise. Further, in terms of address control, the bank can be switched only by rewriting the waveform address.

In the above embodiment, the range of the bank and the capacity of the loop waveform are set for each octave as shown in Table 1 above. However, as shown in Table 3, one octave is divided into three banks. Each bank may be set for every four keys.

[0045]

[Table 3]

When the banks are divided in this way, the relationship between the capacities of the A group, the B group, and the C group in each octave becomes A: B: C = 6: 5: 4, and the capacities of the banks of the C group. Is the same as the capacity of the banks 1 to 8 in the above embodiment. Therefore, the scaler 74 of FIG.
Is a scaler 74 'composed of a shifter 74a' and an accumulator 74b 'as shown in FIG. 8. The shifter 74a' performs a shift operation of two slots per channel, and outputs each output of this slot to an accumulator 74b. '. Here, the slot 1 stores the shift data S in the above embodiment.
The shift data SFo having the same value as that of the F
Is supplied with the shift data SFo + SFg obtained by adding the group shift data SFg thereto or a reset signal.

Table 4 below shows the relationship between the shift data SFo, the group shift data SFg, the reset signal, and each octave and group.
1 "," -2 ",... Correspond to shifts of 1/2, 1/4,.

[0048]

[Table 4]

As can be seen from these combinations and the configuration of FIG. 8, the address count value output from scaler 74 'is as follows.

First, if the bank determined according to the pitch belongs to octave 1, shifter 74 is set with SFo = 0.
Slot 1 of a 'does not shift. Therefore, when the determined bank is group A (bank 1), SF
Since o + SFg = -1 and the slot 2 is shifted by one bit, a value obtained by accumulating 1/2 the address count value input to the scaler 74 'is output. Also,
SFo + SF when bank is group B (bank 2)
g = -2, and the slot 2 is shifted by 2 bits, so that a value obtained by accumulating 1/4 times the address count value input to the scaler 74 'is output. Since the slot 2 is reset and outputs "0", the address count value input to the scaler 74 'is output as it is.

If the determined bank belongs to octave 2, slot 1 of shifter 74a 'is shifted by 1 bit at SFo = -1. Therefore, when the determined bank is the A group (bank 4), SFo + SFg = −2
Since the slot 2 is shifted by 2 bits, a value obtained by accumulating 1/2 times and 1/4 times the address count value input to the scaler 74 'is output. Also, if the bank is B
In the case of the group (bank 5), SFo + SFg = -3, and the slot 2 is shifted by 3 bits, so that the address count value input to the scaler 74 'is 1/2 times and 1
A value obtained by accumulating / 8 times is output, and when the bank is group C (bank 6), slot 2 is reset and outputs "0", so that the address count value is output by multiplying by 1/2. .

If the determined bank belongs to octave 3, slot 1 of shifter 74a 'is shifted by 2 bits at SFo = -2. Therefore, when the determined bank is the A group (bank 7), SFo + SFg = -3.
Since slot 2 is shifted by 3 bits, the address count value input to the scaler 74 is 1/4 times and 1
A value obtained by accumulating / 8 times is output. When the bank is group B (bank 8), SFo + SFg = -4, and slot 2 is shifted by 4 bits, so that a value obtained by accumulating 1/4 and 1/16 times of the address count value is output. When the bank is group C (bank 9), slot 2 is reset and outputs "0", so that the address count value is multiplied by 1/4 and output.

Similarly, the scaler 74 'outputs SFo and SFg according to the octave and group of the determined bank.
, A shift operation and accumulation are performed, and an address count value is output. As a result, the address count value is scaled to a value corresponding to the capacity of each bank shown in Table 3 above, and its integer part is output to the adder 75 and its decimal part is output to the interpolation circuit 76.

In this embodiment, as in the previous embodiment, the waveform address WA is an absolute address for each bank, and the start address SA and end address EA are provided for each bank.
Are set as relative addresses. At the start of sound generation, the waveform address WA, start address SA, and end address EA are set, and thereafter, the bank can be switched only by rewriting the waveform address WA.

In the above embodiment, the waveform capacity is different for each bank. However, the same capacity may be used, for example, 1K words are commonly used for all banks. In this case, a scaler is not required. The output of the address control circuit 73 may be supplied to the adder 75 and the interpolation circuit 76.

Further, the width of the range (the number of keys) may be different for each range, for example, the center range of the keyboard is set to every four keys, and the end range is set to every 12 keys.

As the waveform data, a bank having an attack waveform and a bank having no attack waveform and only a loop waveform may be prepared. In this case, for example, the following operation may be performed. At the start of sounding, be sure to select the bank corresponding to the pitch from the banks that have the attack waveform, and start reading from the attack waveform of that bank.
When the readout of the attack waveform is completed, the loop waveform may be read out by switching to the bank of the waveform corresponding to the pitch among all the banks including the bank having no attack waveform. In this case, even if the number of banks is increased, the capacity of the waveform memory does not need to be increased so much. By increasing the number of banks, the quality of a waveform at the time of a pitch change can be further improved.

In the above embodiment, the case where the pitch is changed by the pitch bend wheel has been described.
The pitch may be changed by a pitch envelope generator or the like.

In the above embodiment, the banks are switched only when the loop waveform is used. However, the banks may be switched when the attack waveform is used. In this case, for example, step S24 in FIG. 7 may be deleted, and the process may proceed from step S23 to step S25.

Further, in the above embodiment, the description has been given of the waveform data having the attack waveform. However, it is needless to say that the present invention can be applied to the case of the waveform data composed only of the loop waveform.

Further, in this embodiment, the sampling waveform is prepared for each sound range bank.
A composite waveform such as a rectangular wave may be prepared for each bank.

[0062]

As described above, according to the waveform memory type tone generator of the present invention, the waveform memory of the plurality of banks corresponding to the plurality of tone ranges of the waveform memory is stored, and the absolute address indicating the waveform data of the bank is stored. A reference relative address is generated to sequentially read the waveform data of the loop portion, and a bank to which pitch data corresponding to a pitch of a musical tone to be generated belongs is determined, and an absolute value corresponding to the determined bank is determined. Address and relative address scaling
The scaling data to be rewritten,
By simply switching the absolute address and scale, you can switch the bank and control the reading of the waveform memory.
The switching control of the loop section according to the change of the pitch of the musical tone can be simplified.

[Brief description of the drawings]

FIG. 1 is a block diagram of a sound source according to an embodiment of the present invention.

FIG. 2 is a diagram showing a memory map for one timbre of a waveform memory in the embodiment.

FIG. 3 is a block diagram of a keyboard electronic musical instrument to which the waveform memory type sound source device of the present invention is applied.

FIG. 4 is a diagram illustrating a configuration of a scaler according to the first embodiment.

FIG. 5 is a flowchart of a main routine in the embodiment.

FIG. 6 is a flowchart of a note-on event process in the embodiment.

FIG. 7 is a flowchart of a timer interrupt event process in the embodiment.

FIG. 8 is a diagram illustrating a configuration of a scaler according to a second embodiment.

[Explanation of symbols]

1 CPU, 2 ROM, 3 RAM, 7 sound source, 8
Waveform memory, 11 ... pitch bend wheel.

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-8-144691 (JP, A) JP-A-2-213899 (JP, A) JP-A-2-300797 (JP, A) JP-A-2- 183298 (JP, A) JP-B 63-62758 (JP, B2) (58) Fields investigated (Int. Cl. ⁷ , DB name) G10H 7/02 G10H 1/053 G10H 1/043

Claims (2)

(57) [Claims] 1. A plurality of banks corresponding to each of the plurality of range is set, together with a waveform data corresponding to the sound range respectively storing waveform data for each bank corresponding to the sound range having a loop portion , The loops have the same relative
The phase of the waveform corresponding to the address is the same for each bank
The higher the range corresponding to the bank, the higher the
Loop size to reduce the loop size for each bank.
Waveform memory for storing different pitches, pitch data generating means for generating time-varying pitch data in one tone of a tone corresponding to the pitch of the tone to be generated, and pitch data generating means Bank determination means for determining the bank to which the pitch data generated in step 1 belongs; waveform address holding means for holding an absolute address designating the waveform data in the waveform memory; and an absolute address held in the waveform address holding means as a reference. the relative address generating means for generating a relative address for sequentially reading the waveform data of the loop portion in an address width corresponding to the pitch data in accordance with the bank is determined by the bank judging means when sound of the loop portion, the waveform While updating the absolute address of the address holding means, the relative address generating means
The relative address to be generated is the size of the loop part of the bank.
Waveform switching means for scaling according to the waveform switching means , wherein when switching the waveform of the loop portion, the waveform switching means
With the absolute address corresponding to the loop part of the switching destination
A waveform memory type sound source device wherein only scaling data is set . 2. A waveform memory type sound source device wherein a CPU takes in pitch data generated from said pitch data generating means, and a sound source reads out waveform data from said waveform memory based on data set from said CPU. Wherein the sound source includes the waveform address holding means and the relative address generation means, and the CPU determines a bank based on the pitch data, and holds the waveform address of the sound source in accordance with the determined bank. the phase updates the absolute address of the unit
2. The waveform memory type tone generator according to claim 1 , wherein scaling of a pair address is controlled.