JPH0337196B2 - - Google Patents

Description

[Detailed description of the invention]

[Industrial Application Field] The present invention relates to a musical tone signal generation device for an electronic musical instrument, and in particular to a musical tone signal generating device that generates a musical tone signal by reading out multiple cycles of waveform data stored in a waveform memory. Regarding the generator. [Prior Art] Conventionally, in order to generate high-quality musical tone signals whose timbre changes over time, multiple periods of musical waveforms (musical tone signals) are sampled at predetermined intervals and waveform data at each sample point is used. A musical tone signal generating device has been proposed in which a musical tone signal is generated by storing a plurality of cycles of waveform data in a waveform memory and sequentially reading out the stored waveform data for a plurality of periods (Japanese Patent Application Laid-open No. 121313/1983, (See Japanese Patent Application No. 53-70191 (Japanese Unexamined Patent Publication No. 54-161313)). [Problems to be solved by the invention] However, in this conventional musical tone signal generation device,
Since musical sound waveforms (waveform data) stored in a waveform memory are faithfully read out and reproduced as they are, the generated musical sound signals are always the same and fixed. Therefore, when trying to generate various musical tone signals, it is necessary to provide multiple waveform memories each storing musical waveforms for multiple periods, which has the drawback of requiring a large capacity memory overall. . This invention was made in view of the above-mentioned drawbacks, and it is possible to easily and inexpensively generate a musical tone signal using a waveform memory that stores musical waveforms for multiple periods without increasing the capacity of the waveform memory. It is an object of the present invention to provide a musical tone signal generating device that can generate various musical tone signals. [Means for Solving the Problems] This invention consists of the following requirements. a Waveform storage means for storing waveform data relating to a musical sound waveform for a plurality of desired periods; b. A waveform storage means for storing waveform data for a plurality of periods stored in the waveform storage means into a plurality of unit waveforms each consisting of at least one period; a first specifying means for specifying in a predetermined order the unit waveforms to be sequentially read out from the waveform storage means in accordance with the passage of time from the time of signal generation; c. a second specifying means by which the performer arbitrarily specifies and inputs a desired unit waveform corresponding to a continuous portion of the musical tone signal; d) each unit stored in the waveform storage means in response to a musical tone signal generation command; Among the waveform-related data, the waveform data related to the unit waveform specified by the first specifying means is sequentially read out, and when reading out the unit waveform specified by the second specifying means, the unit waveform is read out. A reading means that repeatedly reads out a musical tone signal until a command to stop generating the musical tone signal is given. [Operation] When a musical tone signal generation command is given, a plurality of units stored in the waveform storage means are sequentially read out in accordance with the reading order designated by the first designation means, and in this reading, the second designation is performed. When a unit waveform specified by the means is instructed to be read, this unit waveform is repeatedly read out until a command to stop generating a musical sound signal (key release command) is given, and this becomes the sustain part of the musical sound signal. becomes. [Embodiment] FIG. 1 is a block diagram showing an embodiment of an electronic musical instrument to which a musical tone signal generating device according to the present invention is applied. Note that in this specification, musical tone signal is a general term for any musical tone converted into an electrical signal as shown in the waveform diagram of FIG. As indicated by "T" in the waveform diagram, it refers to a period in which a signal having substantially the same waveform shape is repeated during the entire musical tone signal period. Therefore, the term "periodic musical tone signal" used in this specification refers to the musical tone signal of the period indicated by "T" in the waveform diagram of FIG. In this case, as shown in FIG. 2, "2T" may be used as a unit period. Note that in the following description, "T" is assumed to be a unit period.
Therefore, when the periodic musical tone signal is defined as above, if a musical tone given from the outside is sampled at a predetermined period and the amplitude value of each sample point is stored in the musical tone data memory as a musical tone signal, the musical tone data memory A plurality of periodic musical tone signals are stored in the . (1) Configuration description In FIG. 1, the electronic musical instrument showing this embodiment is roughly divided into musical tone data memory 1, writing device 2, musical tone signal detection device for each period, address information memory for each period 4, key switch circuit 5, and period It is composed of a signal generation circuit 6, a selection information setting device 7, a read address information generation device 8, a memory control device 9, and a sound generation device 10. (Musical tone data memory 1) The musical tone data memory 1 receives a mode control signal applied to its read/write control terminal (R/W).
When MD1 is “1”, it becomes light mode,
Each sample point amplitude value of the externally input musical tone supplied from the writing device 2 via the memory control circuit 9, which will be described later, is stored in each address as a musical tone signal, and when the mode control signal MD1 is "0", the read mode is set, and the memory The musical tone signal stored at the address specified by the address information A1 _RW supplied to the address signal input terminal (ADR) via the control circuit 9 is read out.
In the following, for convenience of explanation, musical tone signals to be written into the musical tone data memory 1 will be represented by the symbol "GD _W ," and musical tone signals that have already been stored and musical tone signals that have been read out will be represented by the symbol "GD." Furthermore, the periodic musical tone signal is represented by the symbol "GD1". (Writing device 2) The writing device 2 includes an address information generation circuit that generates address information whose value changes sequentially based on a sampling clock signal of a predetermined cycle, and a digital input musical tone generator, although its internal configuration is not particularly shown. If the electronic musical instrument is equipped with an AD converter, etc. that converts it into a musical tone signal, and the mode switch OP/SW sets the operating mode of the electronic musical instrument to externally input musical tone write mode, the write mode signal
It is enabled by _OP1 , and the microphone M sequentially samples input musical tones from the outside at a predetermined period, and outputs a digital musical tone signal GD _W corresponding to the amplitude value of the externally input musical tone. In this case, the writing device 2
In synchronization with GD _W , write address information A0 _W is output, and a mode control signal MD0 of "1" is output in order to put the musical tone data memory 1 into the write mode by closing the write switches W and SW. (Period-specific musical tone signal detection device 3) The period-specific musical tone signal detection device 3 sequentially reads the musical tone signal GD stored in the musical tone data memory 1 and detects each musical tone signal of each period constituting the entire period of the musical tone signal GD. period-specific address information representing the address of the musical tone data memory 1 where the detected period-specific musical tone signal GD1 is stored.
Output ZXA. The above-mentioned processing by the period-specific musical tone signal detection device 3 is performed when the operation mode of the electronic musical instrument is set to the period-specific musical tone signal detection mode by the mode switch OP/SW.
It is executed only when the period detection mode signal _OP2 is given. That is, when the period detection mode signal OP ₂ of "1" is given, the period-specific musical tone signal detection device 3 first reads the musical tone data memory 1.
A mode control signal MD3 of "0" is output in order to set the tone signal GD to read mode, and then address information A3 _RW for sequentially reading out the musical tone signals GD stored in the musical tone data memory 1 is outputted. Next, the musical tone signal GD read out from the musical tone data memory 1
Detects each periodic musical tone signal GD1 from , and writes periodic address information ZXA representing each address of the musical tone data memory 1 where each periodic musical tone signal GD1 is stored together with the periodic address information A2 _RW for writing. It is output to the information memory 4. As a result, address information for writing is stored in the periodic address information memory 4.
Periodic address information ZXA is stored at the address specified by A2 _RW . (Periodic address information memory 4) The periodic address information memory 4 stores periodic addresses supplied from the periodic musical tone signal detection device 3 when the operation mode of the electronic musical instrument is set to the periodic musical tone signal detection mode. information
Store ZXA in sequence at the address specified by address information A2 _RW . In addition, address information by cycle
When writing ZXA, a mode control signal MD2 of "1" is supplied to the read/write control terminal (R/W) of the memory 4 from the period-based musical tone signal detection device, and thereby the memory 4 is set to the write mode. Become. In this case, periodic address information
ZXA is stored in the order in which periodic musical tone signals GD1 corresponding to the information ZXA are stored in the musical tone data memory 1. That is, the minimum address of the period-specific address information memory 4 stores the period-specific address information ZXA corresponding to the period-specific musical tone signal GD1 of the first period in the rising portion of the externally input musical tone, and the maximum address stores the period-specific address information ZXA of the externally input musical tone. Period-specific address information ZXA corresponding to the last period-specific musical tone signal GD1 in the end portion is stored. On the other hand, the periodic address information memory 4 is also accessed by the read address information generating device 8. In other words, when the mode control signal MD4 of "0" is supplied from the read address information generating device 8 while the operating mode of the electronic musical instrument is set to the performance mode, the electronic musical instrument enters the read mode.
The periodic address information ZXA stored at the address specified by the read address information _A4R is read. In this case, since the periodic musical tone signal detection device 3 and the read address information generation device 8 are instructed to execute a predetermined process by the mode switch OP/SW, the address information A2 for the periodic address information memory 4 is _RW and
A4 _R , no conflict occurs between mode control signals MD2 and MD4. (Key switch circuit 5) The key switch circuit 5 has a key switch corresponding to each key on the keyboard section. When a certain key is pressed, the corresponding key switch operates, and from its output, a note code corresponding to the pitch of the pressed key is generated. It outputs a key code KC consisting of NC and block code BC, and also outputs a key-on signal KON indicating that any key has been pressed. The key switch circuit 5 has a built-in single-tone priority circuit, and is configured so that when two or more key switches operate at the same time, only the key code KC corresponding to the key switch with higher priority is output. . (Periodic signal generation circuit 6) The periodic signal generation circuit 6 includes a frequency number memory 60 that stores a frequency number F corresponding to the pitch of each key at each address, and a frequency number read out from this frequency number memory 60. It is composed of an accumulator 61 that accumulates F at a predetermined period,
When the key code KC corresponding to the pitch of the pressed key is supplied from the key switch circuit 5, the frequency number F corresponding to this key code KC is read out from the frequency number memory 60. The accumulator 61 is
The frequency numbers F read from the frequency number memory 60 are accumulated in sequence at a predetermined period to obtain an accumulated value qF.
(q=1, 2, 3...) is formed. When the cumulative value qF reaches a predetermined value, the carry output signal NqF is output as a periodic signal NqF with a period corresponding to the pitch of the pressed key. (Selection Information Setting Device 7) The selection information setting device 7 is equipped with a data setting keyboard such as a numeric keypad for setting selection information SD for reading out a desired periodic musical tone signal GD1 from the musical tone data memory 1. and,
In this embodiment, the first selection information SD includes a sequence number Mn and repeated reading count information Rn for each reading order, and the second selection information SD includes a set of continuous sequence number information CNn and end sequence number information En. is set according to the format shown in Table 1 below.

[Table] In Table 1, the sequence number information Mn means that the desired periodic musical tone signal GD1 corresponds to the musical tone data memory 1.
This is information representing the sequence number stored in .
The repeat readout number information Rn is the musical tone signal by cycle specified by the previous sequence number information Mn.
This is information representing the number of times GD1 is repeatedly read. Sustainment order number information CNn is a periodic musical tone signal that forms the sustained part of a musical tone that will be generated from now on.
GD1 is information representing the sequence number stored in the musical tone data memory 1. Ending sequence number information
En is information representing the sequence number in which the periodic musical tone signal GD1 forming the end part of the musical tone to be generated from now on is stored in the musical tone data memory 1, and this ending sequence number information En and the above-mentioned continuous sequence number information CNn are set for each generated musical tone. Therefore, these four types of information Mn, Rn,
When CNn and En are as shown in Table 1 above, the first periodic musical tone signal GD1 specified by "Mn = 1" is repeatedly read out the number of times specified by "Rn = 2". , the second periodic musical tone signal GD1 specified by “Mn=3”
is repeatedly read out the number of times specified by "Rn=2". Then, in the same way thereafter, the periodic musical tone signal specified by the sequence number information Mn is
GD1 is repeatedly read out the number of times specified by the number of repeated readout information Rn, but after that, the periodic musical tone signal indicated by "CNn = 20"
When reading of GD1 is specified, the periodic musical tone signal GD1 indicated by "CNn=20" is repeatedly read out until the key is released. As a result, a musical tone responsible for the sustain portion is generated. Then, when the key is released,
The period-specific musical tone signal GD1 specified by the next read-out order information Mn is repeatedly read the number of times specified by the information Rn, but after this, the period-specific musical tone signal GD1 indicated by "En=50" is specified to be read. "En=" until a new key is pressed.
The periodic musical tone signal GD1 indicated by "50" is repeatedly read out. Note that this selection information setting device 7
The selection information SD set in is transferred to and stored in a memory within the read address information generating device 8, which will be described later. (Read address information generation device 8) The read address information generation device 8 generates a musical tone in which the periodic musical tone signal GD1 specified by each selection information SD for each read order set by the selection information setting device 7 is stored. Data memory 1
is detected based on the periodic address information ZXA stored in the periodic address information memory 4, and is output from the periodic signal generator 6 based on the periodic address information ZXA corresponding to each detected selection information SD. Read address information RA that changes sequentially with the period of periodic signal NqF
Output. Incidentally, such processing is executed only when the operating mode of the electronic musical instrument is set to the performance mode by the mode switch OP/SW and the performance mode signal _OP3 of "1" is applied. In other words, when the performance mode signal _OP3 of "1" is given, the read address information generating device 8
First, a mode control signal MD4 of "0" is output in order to put the periodic address information memory 4 and musical tone data memory 1 into read mode. Next, among the selection information SD set by the selection information setting device 7, the musical tone signal GD1 corresponding to each sequence number information Mn, continuous sequence number information CNn, and ending sequence number information En is stored. To detect the address of data memory 1, address information A4 _R corresponding to each information Mn, CNn, and En
are sequentially supplied to the periodic address information memory 4. Then, the periodic address information ZXA corresponding to each piece of information Mn, CNn, and En is sequentially read from the periodic address information memory 4 and stored in the memory in the read address information generating device 8.
Then, when a key is pressed on the keyboard section and a key-on signal KON is generated from the key switch circuit 5,
Based on the periodic address information ZXA, readout address information RA that changes sequentially with the period of the periodic signal NqF is created, and the address information RA is supplied to the musical tone data memory 1 via the memory control device 9. In this case, the read address information RA includes the repeat read count information Rn and the persistence sequence number information.
As described above, the manner of change differs depending on CNn and ending sequence number information En. (Memory Control Device 9) The memory control device 9 controls the writing device 2, the periodic musical tone signal detection device 3, and the read address information generating device 8 according to the operation mode of the electronic musical instrument (writing mode, periodic musical tone detection mode, performance mode).
It performs priority control of access to the musical tone data memory 1 from , and outputs address information A1 _RW , mode control signal MD1, and write data D1 _W to the musical tone data memory 1. That is, the memory control device 9 selects input signals with priority based on Table 2 shown below and outputs them to the musical tone data memory 1.

[Table] (Sound generation device 10) The sound generation device 10 includes a DA converter (DAC) 100,
Envelope control circuit 101, speaker 102
When a desired periodic musical tone signal GD1 is sequentially read out from the musical tone data memory 1 and supplied as a continuous musical tone signal GD, this digital musical tone signal GD is converted into a corresponding analog musical tone signal GA in the DAC 100. is converted to This analog musical tone signal GA is used as a key-on signal in the envelope control circuit 101.
After the amplitude envelope is set by the envelope waveform signal EV that starts generating in synchronization with the rising edge of KON, the speaker 102
supplied to With this, the speaker 102
From there, musical tones corresponding to the periodic musical tone signals GD1 sequentially read out from the musical tone data memory 1 are produced. The above is an explanation of the overall configuration of the electronic musical instrument shown in FIG. (2) Operation description Next, the overall operation will be explained using the flowchart shown in FIG. FIG. 3 is a flowchart showing an outline of the overall operation. First, in this electronic musical instrument, a musical tone signal corresponding to an externally input musical tone is stored in the musical tone data memory 1.
To write GD _W , step 200 in Figure 3
1, the operating mode of the electronic musical instrument is selected and set to write mode using the mode switch OP/SW. Next, as shown in step 2002, the write switch W/SW is closed. Next, in this state, when an externally input musical tone is applied to the microphone M, this externally input musical tone is sampled at a predetermined period in the writing device 2 and converted into a corresponding digital musical tone signal GD _W. This digital musical tone signal GD _W
is supplied to the memory control circuit 9, and from the memory control circuit 9 is supplied to the tone data memory 1 as write data _D1W . At this time, the writing device 2 sends the musical tone signal GD _W as well as the writing address information A0 _W specifying the write address of the musical tone signal GD _W and the mode control signal MD0 for setting the musical tone data memory 1 in the write mode. Address information is supplied to the circuit 9 and sent from the memory control circuit 9 to the musical tone data memory 1.
A1 _RW and mode control signal MD1. This leads to step 20 in FIG.
As shown in 03, in the musical tone data memory 1, musical tone signals GD _W corresponding to the amplitude values of each sample point obtained by sampling externally input musical tones at a predetermined period are sequentially stored at addresses specified by address information A1 _RW (A0 _W ). be done. In this case, musical tone signal GD _W
are stored in order from the smallest address to the largest address. When the writing process of musical tone signal GD _W is completed,
Use the mode switch OP/SW to select and set the operation mode of the electronic musical instrument to period-based musical tone signal detection mode. Next, as shown in step 2004 in FIG. 3, each periodic musical tone signal GD1 of each period is detected from the musical tone signal GD continuously stored in the musical tone data memory 1, and the musical tone signal GD1 for each period is detected.
At 005, base point address information representing the address of the musical tone data memory 1 where the base point portion of each of the detected periodic musical tone signals GD1 is stored is stored in each address of the periodic address information memory 4 as periodic address information ZXA. be done. In this case, the periodic address information memory 4
The minimum address stores period-specific address information ZXA corresponding to the first period-specific musical tone signal GD1 in the rising portion of the externally input musical tone, and the maximum address stores period-specific address information ZXA corresponding to the last period-specific musical tone signal GD1 in the end portion of the externally input musical tone. Corresponding periodic address information ZXA is stored. When the periodic musical tone signal detection processing is completed, the operating mode of the electronic musical instrument is selected and set to the performance mode using the mode switch OP/SW. In the performance mode, steps 2006~
As shown in 2010, the musical tone signal by desired period is
Various selection information SD for selectively reading GD1
is set. In other words, step 20 in Figure 3
In step 06, the continuous sequence number information CNn is set, in the next step 2007, the end sequence number information En is set, in the next step 2008, the sequence number information Mn is set, and further in the next step 2010, the repeated read count information is set. Rn is set. In this case, sequence number information
Mn and repeated reading number information Rn are set as a pair for each reading order.
Therefore, steps 2008 and 20 of FIG.
The operation 09 is repeated for each reading order. The pieces of information CNn, En, Mn, and Rn sequentially set in this way are sequentially stored in the memory provided in the read address information generating device 8 according to the format shown in Table 1 above. In this way, all selection information SD (CNn,
En, Mn, Rn) is completed, in step 2011, the set sequence number information is
Address information by synchronization corresponding to Mn ZXA [Mn],
The periodic address information ZXA[CNn] corresponding to the continuous sequence number CNn and the periodic address information ZXA[En] corresponding to the ending sequence number En are detected based on the stored contents of the periodic address information memory 4, and The storage address length in the musical tone data memory 1 of the periodic musical tone signal GD1 corresponding to the sequence number information Mn is the periodic address information memory 4.
Detected based on the memory contents of. That is, in step 2011, information Mn, CNn, En
Periodic address information corresponding to ZXA [Mn],
Along with being converted to ZXA[CNn] and ZXA[En],
The storage address length of the periodic musical tone signal GD1 corresponding to the information Mn is calculated. Note that the periodic address information ZXA[Mn], ZXA[CNn], ZXA[En] obtained in this step 2011 and storage address length information representing the storage address length
AL is stored in a memory provided within the read address information generating device 8. Here, the period-specific address information ZXA [Mn] represents the address of the musical tone data memory 1 where the fulcrum part of the period-specific musical tone signal GD1 corresponding to the sequence number information Mn is stored, and the period-specific address information Information ZXA [CNn], ZXA [En] is persistence order number information
This represents the address of the musical tone data memory 1 where the end point portion of the periodic musical tone signal GD1 corresponding to CNn and ending sequence number information En is stored. Therefore, the periodic address information stored in each address of the periodic address information memory 4
ZXA is as shown in Table 3 below,
Also, sequence number information set as selection information SD
If Mn, continuous sequence number information CNn, and ending sequence number information En are as shown in Table 1 above, the following 4th
Periodic address information ZXA as shown in the table
[Mn], ZXA [CNn], ZXA [En], address length information AL, and repeat read count information
This means that Rn has been set.

【table】

[Table] After all information setting processing is completed in this way, when the player performs a key press operation as shown in step 2012, step 20
Various information ZXA set from 06 to 2011
[Mn], AL, Rn and ZXA [CNn], ZXA
A musical tone based on [En] is generated. That is, when a certain key is pressed on the keyboard section, the key switch circuit 5 outputs a key-on signal KON and a key code KC corresponding to the pressed key. The key code KC is supplied to the periodic signal generation circuit 6,
As a result, the periodic signal generating circuit 6 outputs a periodic signal NqF having a period corresponding to the pitch of the pressed key. This periodic signal nqF is supplied to the read address information generator 8. On the other hand, a key-on signal KON outputted from the key switch circuit 5 is also supplied to the read address information generating device 8. The read address information generating device 8 is initialized at the rising edge of the key-on signal KON. First, the periodic address information ZXA [Mn] of the first read order is set as the initial value and “ZXA
The read address information RA that increases sequentially at the period of the periodic signal NqF up to the value of [Mn]+AL'' is repeatedly generated the number of times specified by the read count information Rn. The read address information RA generated in this way is stored in the memory control device 9.
The musical tone data is supplied to the musical tone data memory 1 via. As a result, the periodic musical tone signal GD corresponding to the sequence number information Mn set in the first reading order is
1 is read out from the musical tone data memory 1 the number of times set by the repeated reading number information Rn. When the reading of the periodic musical tone signal GD1 based on the selection information SD (Mn, Rn) of the first readout order is completed, next the selection information SD of the second readout order is completed.
Reading of the period-specific musical tone signal GD1 based on (Mn, Rn) is performed in the same manner. Then, while pressing the key (key-on signal KON is “1”)
(during the period), when readout of the periodic musical tone signal GD1 corresponding to the duration sequence number information CNn is specified by the readout address information RA,
From now on, the periodic musical tone signal GD corresponding to the information CNn
1 is read repeatedly. This repeated reading continues until the key-on signal KON becomes "0". This forms the sustained part of the generated musical tone. Then, when the pressed key is released,
The reading of the periodic musical tone signal GD1 based on the selection information SD (Mn, Rn) of the next reading order is continued again. Thereafter, when readout of the periodic musical tone signal GD1 corresponding to the end order number information En is specified by the readout address information RA, the periodic musical tone signal GD1 corresponding to the information En is repeatedly read out. This repeated reading continues until the next new key is pressed. This forms the end of the generated musical tone. The periodic musical tone signal GD1 read out from the musical tone data memory 1 as described above is continuously supplied to the sound generating device 10. As a result, the selection information SD is sent from the sound generation device 10.
A musical tone corresponding to the tone is produced. (3) Detailed explanation of each part Next, the period-based musical tone signal detection device 3 and the read address information generation device 8, which are the main parts of the electronic musical instrument according to the present invention, will be explained in detail. (Period-specific musical tone signal detection device 3) The period-specific musical tone signal detection device 3 is composed of a so-called microprocessor or the like, and detects the period-specific musical tone signal by the method described below. Method for Detecting Period-Specific Musical Tone Signals When the period-specific musical tone signal GD1 is defined as described above, the musical tone data memory 1 stores a plurality of period-specific musical tone signals GD1. However, the plurality of period-specific musical tone signals GD1 stored in the musical tone data memory 1 are not stored separately for each period, but are stored as continuous musical tone signals GD. Therefore, in order to designate and read out the period-specific musical tone signal GD1 from the continuous musical tone signal GD, it is first necessary to determine the base point of each period. Therefore, in this embodiment, the base point of each periodic tone signal GD1 is determined based on the following conditions.

[Table] [Explanation of Condition A]; This means that, as shown in the waveform diagram in Figure 2, in the case of a musical tone signal in which almost the same waveform shape is repeated, the "base point of the period" can be adopted at any sample point. This is because it is common to use a zero-crossing sample point at which the musical tone signal amplitude has a zero amplitude value.

[Table] [Explanation of Condition B]; The zero-crossing sample point where the musical tone signal amplitude becomes zero amplitude value is the zero-crossing sample point in the negative direction when the musical tone signal amplitude changes from a positive value to a negative value, and the zero-crossing sample point where the musical tone signal amplitude changes from a positive value to a negative value. There are two types: a zero-crossing sample point in the positive direction when the amplitude changes from a negative value to a positive value. This embodiment employs zero-crossing sample points in the positive direction.

[Table] [Explanation of Condition C]; As shown in the waveform diagram of Figure 2, in the case of a music signal that contains many harmonic components, a ₁ , b ₁ , c ₁ or As shown by the signals a ₂ , b ₂ , and c ₃ , a plurality of positive zero-crossing sample points appear in a certain musical tone signal period. In such a case, for example, if a positive direction zero-crossing sample point indicated by symbol b ₁ is adopted, in the next musical tone signal period, a point indicated by symbol b ₂ corresponding to the positive direction zero-crossing sample point indicated by symbol b ₁ is used. There is a positive zero-crossing sample point that
Furthermore, in the next musical tone signal period, this symbol
There are no equivalents to the positive zero-crossing sample points indicated by b ₁ and b ₂ . For this reason, the musical tone signal period for each cycle becomes unstable. In other words, in the waveform diagram of Figure 2, the symbol
The positive zero-crossing sample points indicated by b ₁ , b ₂ and c ₁ , c ₂ are unstable positive zero-crossing samples that easily appear or disappear due to level fluctuations or phase fluctuations of harmonic components. It becomes a point. It is clear that if such an unstable positive direction zero-crossing sample point is set as the base point of the musical tone signal by period, the period of the musical tone signal by period becomes unstable. Conversely, in the waveform diagram of Fig. 2, the symbols a ₁ , a ₂ ,
Positive direction zero-crossing sample points such as a ₃ and a ₄ have sufficiently large amplitude values in the periods before and after them, so even if there are level fluctuations or phase fluctuations of harmonic components, they are not affected greatly, and can be used for quite long musical tones. It is considered that the signal exists throughout the signal period. Therefore, if such a positive direction zero-crossing sample point is set as the base point of the periodic musical tone signal, it is thought that the periodic musical tone signal period will be relatively stable. Therefore, in order to set the positive direction zero cross sample points as shown by symbols a ₁ , a ₂ , a ₃ , and a ₄ as the base points of the period-specific musical tone signal, the musical tone signal is adjusted as shown in the waveform diagram of FIG. An integral value Sa ₅ of the musical tone signal amplitude in a predetermined period Tα before and after each of a plurality of positive direction zero cross sample points a ₅ , b ₆ , c ₆ existing in a certain musical tone signal period Tm in the entire period,
Sb ₆ and Sc ₆ are determined, and a positive direction zero cross sample point a ₅ corresponding to the integral value Sa ₅ indicating the maximum value among the determined integral values is detected. In this case, the detection processing procedure is as follows: Since the musical tone signal near the rise of the musical tone has large level fluctuations and phase fluctuations of harmonic components, the first step in the musical tone signal period when the musical tone is sufficiently stable is to A reference positive direction zero cross sample point is determined by the method described above, and then the detection range is sequentially moved in the attack direction and decay direction around this reference positive direction zero cross sample point. As described above, the positive zero-crossing sample points that serve as the base points of periodic musical tone signals are set. The positive zero-crossing sample point, which is the base point of the period-specific musical tone signal, is set as follows. That is, when a musical tone of a certain frequency is sampled sequentially at a predetermined period, the number of sample points corresponding to the period of the musical tone signal can be predicted (this number of sample points is assumed to be n). For this reason,
As explained in the section of condition C above, if a positive direction zero-crossing sample point that is the base point of one cycle-specific musical tone signal is set, "+n+
Detect positive zero-crossing sample points in the range of ``β'', and set the positive zero-crossing sample point that meets the above condition C among the detected positive zero-crossing sample points as the base point of the musical tone signal for each period one cycle later. do. In other words, as shown in the waveform diagram of Fig. 5, when setting the positive direction zero-crossing sample point which becomes the base point of the period-specific musical tone signal one cycle later, the first positive direction zero-crossing sample point set
_A positive direction zero-crossing sample point _a1 in the range of "+n+β" is detected using a0 as a reference point, and this positive direction zero-crossing sample point _a1 is set as the base point of a new period-specific musical tone signal. In this case, "+n+β"
If there is no positive zero-crossing sample point that meets the above condition C in the range of Set as base point. Note that when detecting a positive direction zero-crossing sample point that is the base point of a period-specific musical tone signal in a period earlier than the period-specific musical tone signal of a certain period whose base point was first detected, the first detected positive direction zero-crossing sample point is used as the reference point. The positive direction zero-crossing sample point in the range "-n-β" may be detected in the same manner as in the above case. The above is the basic method of setting the positive direction zero-crossing sample point, which is the base point of the periodic musical tone signal.
In addition to this, in order to deal with various kinds of complicated musical tone signals, setting methods as shown in the following cases A to B are executed.

[Table] [Explanation of case A]; As mentioned above, the base point of the periodic musical tone signal is a certain musical tone signal period Tm
Among the plurality of positive direction zero cross sample points existing in the positive direction zero cross sample points, the positive direction zero cross sample point is set at which the integral value of the musical tone signal amplitude in a predetermined period Tα centered on each positive direction zero cross sample point has the maximum value. Because there is a limit to the sampling period when sampling musical tone signals,
As shown in the waveform diagram in Figure 6, the sample points are
There may be no positive zero-crossing sample point between _a10 and _a15 . In such a case, among the sample points before and after the musical tone signal amplitude reaches zero amplitude value (a ₁₂ and a ₁₃ in the waveform diagram of Fig. 6), the sample point with the smaller absolute value amplitude is set to the zero cross in the positive direction. Set as a sample point. In the case of the waveform diagram of FIG. 6, sample point _a12 is set as the positive zero-crossing sample point.

[Table] [Explanation of case B]; In the waveform diagram of Fig. 7,
After setting the standard positive direction zero cross sample point a ₀ according to the above condition C, when trying to set the positive direction zero cross sample point one cycle later, the above condition C is set in the range of "a ₀ + n±β".
There may be two (or more) positive zero-crossing sample points a ₁ and a ₂ corresponding to . In such a case, each positive zero-crossing sample point
The correlation between each waveform shape before and after a ₁ and a ₂ and the waveform shape before and after the detection reference positive direction zero cross sample point a ₀ is compared, and the positive direction zero cross sample point with the larger correlation is adopted. Comparison and determination of this correlation is performed simply as follows. That is, as shown in FIGS. 8a and 8b, a musical tone signal waveform f(t) passing through the positive zero-crossing sample point _a0 and a musical tone signal waveform _g1 passing through the positive zero-crossing sample point _a1 .
Find the area _t 〓 ^-t |f ₍ t)-g ₁ (t)| surrounded by The passing musical tone signal waveform g ₂ (t) is the interval “-t~+t”
Find the area _t 〓 ^-t ｜f ₍ t)-g ₂ (t) It is determined that the correlation is the highest. In the case of positive direction zero cross sample points a ₁ and a ₂ in Fig. 7, the 8th
As is clear from FIGS. a and b, the positive zero-crossing sample point a ₂ is set as the base point one cycle after the reference positive zero-crossing sample point a ₀ . As for the overall processing, based on the above conditions, first of all, as mentioned above,
A reference positive direction zero-crossing sample point is set as a reference during a musical tone signal period in which the musical tone is sufficiently stable, and one period before, two periods before, etc. from the reference positive direction zero-crossing sample point are set at the beginning of the musical tone signal. Set the positive zero-crossing sample points in sequence until the first positive zero-crossing sample point is set as a reference, then after one period, two periods, and so on until the attenuation part of the musical tone signal Set direction zero cross sample points sequentially. By doing this, all base points of the musical tone signal for each period from the start to the end of the musical tone are set. Note that, hereinafter, the period-specific musical tone signal corresponding to the reference positive direction zero-crossing sample point will be referred to as the reference period-specific musical tone signal GD1m. Therefore, among the musical tone signals GD from the start to the end of the musical tone, a desired period-specific musical tone signal GD is selected.
To specify and read 1, the following specification method may be used. (a) The address of the musical tone data memory 1 corresponding to the positive direction zero-crossing sample point as the base point of each period is given as the base point address information, and the desired period-specific musical tone signal GD1 is designated by this base point address information. (b) The addresses of the musical tone data memory 1 corresponding to the positive direction zero-crossing sample points as the base point and end point of each period are provided as the base point address information and the end point address information, and a desired period-specific musical tone signal GD1 is generated using these information. specify. (c) Provide sequence number information indicating the order in which each periodic musical tone signal GD1 is stored in the musical tone data memory 1, decode which base point address information this sequence number information corresponds to, and thereby A desired periodic musical tone signal GD1 is designated. (d) A memory area in the musical tone data memory 1 is determined for each periodic musical tone signal GD1, and a desired periodic musical tone signal GD1 is designated by information representing this memory area. This method (d) is
This is practically the same as the case using the method (b) above. The electronic musical instrument of this embodiment employs the specification method (c) above. FIGS. 9 to 11 show the period-specific musical tone signal detection device 3.
3 is a detailed flowchart showing the detection process of the periodic musical tone signal GD1 in FIG. In FIG. 9, when the operation mode of the electronic musical instrument is selected and set to period-specific musical tone signal detection mode (ZXA detection mode), the processing by period-specific musical tone signal detection device 3 is performed based on the standard as shown in step 2041.
The process moves to the execution of the ZXA detection routine, and in this routine, a reference period-specific musical tone signal is used as a detection standard for each period-specific musical tone signal GD1 in the entire musical tone signal period.
GD1m is detected. In other words, the reference positive zero-crossing sample point is set. Then, as shown in step 2042, step 204 is performed.
1 cycle before, 2 cycles before, 3
A positive zero-crossing sample point corresponding to the base point of the period-specific musical tone signal GD1 before the period is detected. In this way, the detection processing of each positive direction zero cross sample point corresponding to the base point portion of each periodic musical tone signal GD1 toward the rising direction of the musical tone is performed. When the address information A3 _RW , which has been sequentially sent from 3 to the musical tone data memory 1, reaches a value specifying the front end address of the musical tone data memory 1, the detection process proceeds to step 2044 according to the judgment process at step 2043. Then, in steps 2044 and 2045, from now on, the reference positive direction zero-crossing sample point is used as a detection standard to detect musical tone signals by cycle after one cycle, after two cycles, after three cycles, etc.
Positive direction zero cross sample points corresponding to the base point portion of GD1 are sequentially detected until the end portion of the musical tone is reached. In this way, the positive direction zero-crossing sample points corresponding to the base point portion of each periodic musical tone signal GD1 are detected, and the base point address information representing the address of the musical tone data memory 1 corresponding to each positive direction zero-crossing sample point is the periodic address. Information ZXA
It is stored in the periodic address information memory 4 as . FIG. 10 is a flowchart showing the reference ZXA detection routine in more detail. In FIG. 10, as shown in step 2050, first, one end of the address area E where a musical tone signal GD corresponding to a stable portion of the externally input musical tone is stored among the musical tone signals GD stored in the musical tone data memory 1. The address information A indicating
Set to ADR・C. Thereafter, as shown in step 2051, the musical tone signal GD is transferred from the corresponding address of the musical tone data memory 1 based on the contents of the address counter ADR.C.
is read out. Then, in the next step 2052, it is determined whether the musical tone signal GD read from the musical tone data memory 1 corresponds to a zero amplitude value. If it does not correspond to the zero amplitude value, as shown in step 2054, it is determined whether the contents of the address counter ADR.C (ADR.C) exceed address information B indicating the other end of the address area E. be judged. If “(ADR・C)≦B”, the contents of address counter ADR・C are incremented (+1) in step 2055.
The process returns to step 2051. and,
A new musical tone signal GD is read from the corresponding address of the musical tone data memory 1 based on the contents of the new address counter ADR.C. Then, in step 2052 again, it is determined whether the new musical tone GD corresponds to a zero amplitude value. If it corresponds to a zero amplitude value, that is, if the address specified by the contents of the address counter ADR・C corresponds to a zero-crossing sample point in the positive direction, the address counter at this time
Contents of ADR・C and musical tone signal in the ±α region centered on the positive direction zero-crossing sample point
The surrounding area value S of GD is temporarily stored. When this process is completed, it is determined in the next step 2054 whether the contents of the address counter ADR.C exceed address information B indicating the other end of the address area E. If "(ADR.C)≦B", the contents of the address counter ADR.C are incremented at step 2055, and the process returns to step 2051. And a new address counter
A new musical tone signal GD is read from the corresponding address in the musical tone data memory 1 based on the contents of ADR.C. Then, again in step 2052, it is determined whether the new musical tone signal GD corresponds to a zero amplitude value. In this way, all the positive direction zero-crossing sample points in the address area E are detected, and the zero-crossing sample point address information representing the address of the musical tone data memory 1 corresponding to the positive direction zero-crossing sample point and the surrounding area value corresponding thereto. Once S is temporarily stored, then step 2056
In the step, the positive zero-crossing sample point having the largest peripheral area value among the peripheral area values S for each positive zero-crossing sample point is discriminated and extracted. Then, the positive zero-crossing sample point thus determined and extracted is set as a reference zero-crossing sample point within the entire period of the musical tone signal, and the corresponding reference zero-crossing sample point address information is temporarily stored. and,
Based on this reference zero cross sample point address information, one cycle before, two cycles ago... or one cycle later, two
Positive direction zero cross sample points corresponding to the base point portion of the period-specific musical tone signal GD1 after the period are sequentially detected. FIG. 11 is a flowchart showing the ZXA detection routine after one cycle in step 2044 of FIG. 9 in more detail. In FIG. 11, as shown in step 2070, reference zero-crossing point address information is first set in address counter ADR.C as an initial value. Next, in step 2071, a constant n is added to the contents of the address counter ADR.C.
This constant n corresponds to the number of sample points n shown in the waveform diagram of FIG. Next, in step 2072, the contents of address counter ADR.C are incremented by "+1".
Then, based on the contents of the address counter ADR.C, the musical tone signal GD is read out from the corresponding address of the musical tone data memory 1, and the next step 2 is performed.
At step 073, it is determined whether this musical tone signal GD corresponds to a zero amplitude value. If it does not correspond to a zero amplitude value, step 2075
In step 1, it is determined whether the number of detected points exceeds β. This "β" corresponds to the number of sample points β shown in the waveform diagram of FIG. As a result of the judgment process in step 2075, if “number of inspection points ≦β”, address counter ADR・C
The contents of are incremented (+1) in step 2072. Then, a new musical tone signal GD is generated based on the contents of the new address counter ADR・C.
is read out. Then, in step 2073 again, it is determined whether the new musical tone signal GD corresponds to a zero amplitude value. If it corresponds to a zero amplitude value in the positive direction, the contents of the address counter ADR・C at this time are temporarily stored, and
A musical tone signal in a predetermined interval "-t~t" centered on the positive direction zero cross sample point and a predetermined interval "-t~t" centered on the reference positive direction zero cross point detected in the previous step 2041 (FIG. 9). '' with the musical tone signal (reference musical tone signal GD1m) is determined, and this correlation coefficient is temporarily stored. When this process is completed, the next step 207
5, it is determined whether the number of inspection points exceeds β. If "number of inspection points ≤ β", the contents of the address counter ADR.C are incremented in step 2072, and then the determination process in step 2073 is performed again. In this way, positive direction zero cross sample points in the "+β" section that are "+n" away from the reference zero cross sample point are sequentially detected. It is determined whether a sample point was present. If a positive direction zero cross sample point exists, in the next step 2078, the positive direction zero cross sample point with the largest correlation coefficient among the correlation coefficients stored in the process of step 2074 is discriminated and extracted, and this is used as the base point after one cycle. Set. In the determination process of step 2076, if a positive zero-crossing sample point does not exist, the contents of address counter ADR.C are sequentially incremented in step 2077 until a positive zero-crossing sample point is detected. In this case, the first detected positive zero-crossing sample point is set as the base point after one cycle. In this way, first, a positive direction zero-crossing sample point corresponding to the base point portion of the period-specific musical tone signal GD1 after one period is set. And then one more
In order to set a positive direction zero cross sample point corresponding to the base point of the period-specific musical tone signal GD1 after the period, it is checked in step 2079 whether address information A3 _RW for the musical tone data memory 1 corresponds to the rear end address of the memory 1. Detected. If the last address has not been reached, in step 2071 the current address counter is
A constant n is further added to the contents of ADR.C.
And this new address counter ADR・C
Based on the contents of , a positive direction zero-crossing sample point corresponding to the base point portion of the period-specific musical tone signal GD1 after one period, that is, after two periods, is set in the same manner as in the above case. This process is repeated until the address information _A3RW for the musical tone data memory 1 reaches the rear end address. Through the above processing, positive zero-crossing sample points corresponding to the base point portions of the musical tone signal GD1 for each cycle are sequentially set after one cycle, two cycles, three cycles, etc. from the reference positive zero-crossing sample point. Note that the processing in the one cycle previous ZXA detection routine at step 2042 in FIG. 9 is carried out in a similar manner. Therefore, the explanation thereof will be omitted. As described above, each periodic musical tone signal GD1 is detected, and the address of the musical tone data memory 1 in which its base point is stored is determined as periodic address information.
Once stored as ZXA in the periodic address information memory 4, the operating mode of the electronic musical instrument is then set to the performance mode by the mode switch OP/SW. (Read Address Information Generator 8) FIG. 12 is a block diagram showing one embodiment of the read address information generator 8. As shown in FIG. In FIG. 12, the read address information generating device 8 includes a selection information memory 800, a start address information memory 801, and a read number information memory 80.
2. Persistent address information memory 803, end address information memory 804, address length information memory 80
5, arithmetic unit 806, program memory 807,
Address pointer 808, counters 809 and 810, comparators 811, 812, 813, 81
4, an adder 815, and a one-shot circuit 816. Sequence number information Mn, repeated read count information Rn, continuous sequence number information CNn, and end sequence number information En as the aforementioned selection information SD set in the selection information setting device 7 are input to the selection information memory 800 and stored. This selection information memory 800
Among the pieces of information Mn, Rn, CNn, and En stored in , the information Mn, CNn, and En are cycle-specific address information ZXA [which represents the address in the musical tone data memory 1 where the corresponding cycle-specific musical tone signal GD1 is stored, Mn], ZXA[CNn], ZXA[En], ZXA[Mn] is the starting address information SA, and ZXA[Cn] is the persistent address information CNA.
Also, ZXA [En] is the end address information EA
each as a start address information memory 80
1, stored in persistent address information memory 803 and end address information memory 804. Information Mn,
The conversion process of CNn and En is executed by the calculation process 806. On the other hand, the repeated reading number information Rn is transferred as is to the reading number information memory 802 and stored therein. In this case, selection information memory 800, start address information memory 801, read count information memory 802, persistent address information memory 803, end address information memory 804, and address length information memory 805 are configured as I/O devices of arithmetic unit 806. ing. In a state where the arithmetic unit 806 is supplied with the arithmetic mode signal _OP3 of "1" from the mode switch OP/SW, the arithmetic unit 806 first selects the persistence order number information from among the selection information SD stored in the selection information memory 800.
CNn and ending sequence number information En are read out, periodic address information ZXA[CNn] and ZXA[En] corresponding to the information CNn and En are detected based on the stored contents of the periodic address information memory 4, and this detected Periodic address information ZXA [CNn] and
ZXA [En] as the persistent address information CNA and end address information EA, respectively, on the data bus D.
Persistent address information memory 803 and end address information memory 804 of one word configuration via BUS
Transfer and store them respectively. Subsequently, the arithmetic unit 806 reads out the sequence number information Mn for each reading order of the periodic musical tone signal GD1 and the repeated reading number information Rn from the selection information memory 800, and the repeated reading number information Rn is directly transmitted via the data bus D.BUS. The sequence number information Mn is transferred to the read count information memory 802, and the periodic address information ZXA [Mn] corresponding to the information Mn is detected based on the stored contents of the periodic address information memory 4, and this information ZXA
[Mn] is transferred to the start address information memory 801 via the data bus D.BUS as the start address information SA. At this time, the calculation device 800
transfers the address information representing the write address of these write information (Rn, SA) to the address pointer 808 using the data bus D.BUS, and causes the address pointer 808 to output it as control address information APi. Then, the start address information SA and the repeated read count information Rn are stored in the addresses specified by the control address information APi of the start address information memory 801 and the read count information memory 802, respectively. Incidentally, in this case, the period-specific address information memory 4 is configured to be accessible from both the arithmetic unit 806 and the period-specific musical tone signal detection device 3, and the period-specific address information memory 4 is configured to be accessible from both the arithmetic unit 806 and the period-specific musical tone signal detection device 3. Information ZXA [Mn], ZXA [CNn], ZXA
When the arithmetic unit 806 detects [En], the arithmetic unit 806 first sends a mode control signal MD4 of "0" to the periodic address information memory 4, and sets the periodic address information memory 4 to the read mode.
Next, the continuous sequence number information CNn stored in the selection information memory 800 is read out, and the information "CNn+1" obtained by adding "1" to the information CNn is periodically read out as address information _A4R for reading via the address bus A/BUS. The address information is supplied to the separate address information memory 4. Then, the periodic address information ZXA corresponding to the information "CNn+1" is retrieved from the periodic address information memory 4.
[CNn+1] is read. That is, information ZXA[CNn+1] representing the address of the musical tone data memory 1 where the end point portion of the periodic musical tone signal GD1 corresponding to the continuous sequence number information CNn is stored is read from the periodic address information memory 4. The information ZXA[CNn+1] read in this manner is transferred to and stored in the persistent address information memory 803 as periodic address information ZXA[CNn]. Next, the arithmetic unit 806 reads out the end order number information En stored in the selection information memory 800, and adds "+1" to the information En to obtain information "En+1".
is supplied to the periodic address information memory 4 as address information _A4R for reading. Then, information ZXA[En+1] representing the address of the musical tone data memory 1 where the end point portion of the periodic musical tone signal GD1 corresponding to the ending sequence number information En is stored is read out from the periodic address information memory 4. The information ZXA[En+1] read in this manner is transferred to and stored in the end address information memory 804 as periodic address information ZXA[En]. Here, add "+1" to information CNn and En, respectively.
The reason why the information "CNn+1" and "En+1" are supplied as address information to the cycle-by-cycle address information memory 4 is because the cycle-by-cycle address information ZXA stored in the memory 4 corresponds to each cycle-by-cycle musical tone signal GD1.
This corresponds to the storage address of the base point part of the periodic musical tone signal GD1 specified by the information CNn and En, respectively, and the storage address of the ending point part of the periodic musical tone signal GD1 of the next cycle. This is because it is applicable. In this way, periodic address information ZXA
When the detection process for [CNn] and ZXA[En] is completed, the arithmetic unit 806 reads out the sequence number information Mn for each readout order from the selection information memory 800, and uses the information Mn as readout address information _A4R for each cycle. The address information is supplied to the memory 4. As a result, the periodic address information ZXA[Mn] corresponding to the information Mn is read from the periodic address information memory 4.
This read periodic address information ZXA [Mn]
is transferred to and stored in the start address information memory 801 as start address information SA. When the writing process of various information to the memories 801 to 804 is completed as described above, the storage address length in the musical tone data memory 1 of the periodic musical tone signal GD1 specified by the sequence number information Mn is then changed to the periodic address information memory 4. Detected based on the memory contents of. That is, in this embodiment, the period-specific address information ZXA represents the address of the musical tone data memory 1 where the base point portion of the period-specific musical tone signal GD1 is stored, as described above. Therefore,
In order to read out a certain desired period-specific musical tone signal GD1 from the musical tone data memory 1, the period-specific musical tone signal GD1 must be read out from the musical tone data memory 1.
It is necessary to know the base address of GD1 as well as its storage address length. Therefore, the calculation device 80
6 reads from the periodic address information memory 4 the periodic address information ZXA regarding the periodic musical tone signal GD1 next to the periodic musical tone signal GD1 corresponding to the sequence number information Mn stored in the selection information memory 800. This readout process adds "+1" to the above sequence number information Mn, and this added value "Mn+1"
This is realized by supplying the periodic address information memory 4 as address information _A4R for reading. As a result, the period-specific address information of the period-specific musical tone signal GD1 stored at the next address is
ZXA〔Mn+1〕 is known, and this information ZXA〔Mn+
1] and the periodic address information ZXA[Mn] corresponding to the above sequence number information Mn, the information
The storage address length in the musical tone data memory 1 of the periodic musical tone signal GD1 corresponding to Mn can be known. The storage address length information AL of the periodic musical tone signal GD1 corresponding to the information Mn detected in this way is transferred to the address length information memory 805 via the data bus D/BUS, and the control address is output from the address pointer 808. The information is stored at the address of the memory 805 specified by the information API. In this case, start address information SA regarding the same read order, repeat read count information Rn,
Address length information AL is the same control address information
Start address information memory 8 specified by APi
01, is stored in the address of the read count information memory 802 and the address length information memory 805. The above processing is executed according to the program stored in the program memory 807. Next, when the above processing is completed, when a key is pressed on the keyboard section, a key-on signal KON is supplied from the key switch circuit 5, and
A periodic signal NqF corresponding to the pitch of the pressed key is supplied from the periodic signal generating circuit 6. Then, the key-on signal KON is inputted to the computing device 806 as a performance start command, thereby causing the computing device 80
6 enters a stopped state, and the main body of address control over the start address information memory 801, read count information memory 802, and address length information memory 805 is transferred to the address pointer 805. On the other hand, the key-on signal KON is output from the front circuit 816.
The key-on pulse KONP is input as a trigger signal to the one-shot circuit 816, thereby outputting a key-on pulse KONP with a narrow pulse width. This key-on pulse KONP is supplied to address pointer 805 and counters 809 and 810 as a reset signal, whereby address pointer 805 and counters 809 and 810 are reset. In this state, the periodic signal NqF is
When supplied sequentially to the clock input terminal (CK) of
A counter 809 counts the periodic signal NqF,
From its output, step information Q (Q=1, 2, 3, . . . ) that increases sequentially with the period of the signal NqF is output. On the other hand, the address pointer 808 indicates the key-on pulse
“0” due to being reset by KONP
Outputs the control address information APi of the memory 80
1, 802 and 805 are designated to read the information stored at address "0". Therefore, these memories 801, 802 and 805
If the stored contents for each periodic musical tone signal reading order are as shown in Table 5 below, "1275" is stored from the start address information memory 801.
The start address information SA of ``3'' is output from the read count information memory 802, and the repeat read count information Rn of ``3'' is output from the address length information memory 805, and the address length information memory AL of ``253'' is output. Ru. On the other hand, the persistent address information memory 803 outputs the persistent address information "4572", and the ending address information memory 704 outputs the ending address information EA "7597".

〔Effect of the invention〕

As explained above, according to the musical tone signal generating device according to the present invention, when a musical tone signal generation command is given, a plurality of unit waveforms stored in the waveform memory are read out in the order specified by the first specifying means. , in this reading, reading of the unit waveform specified by the second specifying means is specified;
This is read out repeatedly until a musical sound signal generation stop command is given, making it a continuous part of the musical sound signal.Moreover, since the performer can arbitrarily input the unit waveform into the second designation means, this It is possible to easily change the timbre change (especially the coloring of the sustained part) of the musical tone signal according to the specified input. As a result, without increasing the waveform memory capacity,
Any variety of musical tone signals can be generated with a simple and inexpensive configuration.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of an electronic musical instrument to which a musical tone signal generating device according to the present invention is applied, and FIG. 2 is a waveform diagram for explaining the meaning of periodic musical tone signals used in the present invention. Figure 3 is the first
Flowchart for explaining the overall operation of the electronic musical instrument shown in the figure, Figures 4 to 11 are waveform diagrams and flowcharts for explaining the method of detecting musical tone signals by period, and Figure 12 is for reading address information. Block diagram showing one embodiment of the generator, Fig. 13~
Fig. 14 is a waveform diagram for explaining the necessity of harmonic component phase matching, Fig. 15 is a detailed block diagram showing another embodiment of the read address information generating device, and Fig. 16 is a selection information setting device. FIG. 17 is a detailed block diagram showing still another embodiment of the read address information generating device, and FIG. be. 1... Musical sound data memory, 2... Writing device,
3...Periodic musical tone signal detection device, 4...Periodic address information memory, 5...Key switch circuit, 6
... Periodic signal generation circuit, 7 ... Selection information setting device, 8 ... Read address information generation device, 9 ...
Memory control device, 10... Sound generation device.

Claims (1)

[Scope of Claims] 1 a. A waveform storage means for storing waveform data related to a musical sound waveform for a plurality of desired cycles, and b. a first specifying means for specifying, in a predetermined order, the unit waveforms to be divided into unit waveforms and read out sequentially from the waveform storage means in accordance with the passage of time from the generation of the musical tone signal; c the first specifying means; a second specifying means by which the performer arbitrarily specifies and inputs a desired unit waveform corresponding to the continuous portion of the musical tone signal among the unit waveforms sequentially specified by; d) in response to a musical tone signal generation command; Among the data related to each unit waveform stored in the waveform storage means, the waveform data related to the unit waveform specified by the first specifying means is read out sequentially, and the waveform data related to the unit waveform specified by the second specifying means is and reading means for repeatedly reading out the unit waveform until a command to stop generation of the musical tone signal is given when reading out the unit waveform, and generating the musical tone signal based on the waveform data read from the waveform storage means. A musical tone signal generator for electronic musical instruments.