JP2893698B2 - Music signal generator - Google Patents

Description

Description: TECHNICAL FIELD [0001] The present invention relates to a tone signal generating device that generates a tone signal based on waveform data stored in a storage unit.

[Prior art and its problems] Conventionally, based on pitch data specified by a pitch specifying operation using a pitch specifying switch or the like, from a waveform memory storing waveform data in digital representation such as a PCM method, for example. 2. Description of the Related Art There is known a musical tone signal generating apparatus of a waveform reading system for reading out waveform data and generating musical tones. In an electronic musical instrument to which this type of tone signal generator is applied, when the pitch of a tone being played is smoothly changed, for example, when legato playing, pitch bend operation, portamento operation, glissando operation, etc. are performed, the currently sounding tone is generated. Using the waveform data read from the waveform memory corresponding to the musical tone (the musical tone immediately before the pitch change), the pitch is changed by simply changing only the read speed (read frequency).

That is, as shown in FIG. 9 (1) and (2), for example, a tone pitch C ₄ in the middle of reading by the loop by sound between the loop start address a and the loop end address b When sounding instruction (Figure 9 (3) refer) pitch C ₅ at legato is made, the same waveform data of the same loop as the pitch C ₄ is used as it is, however, the reading speed (reading frequency) is only is changed in correspondence to the pitch C _5. Therefore, since the waveform data read before and after the legato playing method does not change, the timbre does not naturally change depending on the musical range unlike a natural musical instrument. There is a problem that an unnatural state occurs before and after the change.

Further, in the above-described conventional waveform readout tone signal generating apparatus of the type described above, for example, when the pitch during sound generation is smoothly changed by the legato playing technique or the like, the waveform data is read out by a loop operation. At any point in the middle of the loop, that is, even if it does not correspond to the loop end address or the zero cross point, the reading speed is immediately changed to change the pitch.

That is, as shown in FIG. 9 (2), for example, a tone pitch C ₄ to the middle of reading between the loop start address a and the loop end address b by the loop, the pitch C in legato If there is ₅ pronunciation instruction (Figure 9 (3)), and immediately the reading speed by changing in correspondence to the pitch C _5, the waveform data of the same loop portion and the pitch C ₄ are read out. Therefore, when the pitch is changed, completely different waveform data is generated within the loop cycle, and the waveform data is read, so that there is a problem that an unnecessary timbre is instantaneously generated.

[Purpose of the Invention] The present invention has been made to solve the above-mentioned problems, and includes a legato playing method, a pitch bend operation, a portamento operation, a glissando operation and the like for smoothly changing the pitch during sounding. It is an object of the present invention to provide a tone signal generating device in which a natural tone changes before and after a pitch change when an operation is performed.

Further, the present invention is directed to a technique in which, when a playing technique or an operation for smoothly changing a pitch being produced, such as the legato playing technique, is performed, an unnecessary change in tone color occurs momentarily when the pitch is changed. The aim is to obtain a musical tone signal generator that does not have any.

[Gist of the Invention] In order to achieve the above object, the present invention stores different waveform data corresponding to a plurality of different tone ranges in a storage means, and the pitch of the tone signal being generated belongs to the pitch. When a pitch change operation is performed to change to a new pitch belonging to a different pitch from the pitch, the waveform data to be read from the storage means after waiting for the detection of the loop end address is changed to the pitch to which the new pitch belongs. The point is that the new waveform data is switched to the corresponding new waveform data, the new waveform data is read out based on the frequency corresponding to the new pitch, and the timbre is changed together with the pitch.

Further, the present invention has a storage means for storing waveform data, and when a pitch change operation for changing the pitch of a tone signal being generated to a new pitch is performed, the loop end address of the storage means is changed. Alternatively, at the timing when the waveform data at the zero crossing point is read, the waveform data is read based on the frequency corresponding to the new pitch, and the pitch is changed.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

First Embodiment Configuration First, the configuration of an electronic wind instrument according to a first embodiment to which the musical tone signal generating device of the present invention is applied will be described with reference to the overall circuit block diagram shown in FIG. The CPU 1 controls the entire circuit related to the entire circuit block.
The overall circuit block will be described focusing on the function of U1. The voltage conversion circuit 3 converts breath information detected by the breath sensor 2 into a voltage value. And this voltage value is A /
After being converted into a digital value by the D converter 4, the digital value is given to the CPU 1 as digital breath information.

The CPU 1 also controls the pitch data specified by the pitch specifying operation on the pitch specifying switch unit 5, the timbre control data related to the timbre selected by operating the timbre changeover switch 6-1 in the timbre / effect switch unit 6, and And pitch change control data given by a pitch change operation by operating the pitch bender 6-1 or the portamento setting switch 6-2. Then, the CPU 1 sends out tone control information based on these various data to the PCM tone generator 7.

The PCM waveform memory 8 stores, for example, C _{4 to} B as shown in FIG. 2A.
_{4, C 5 ~B 5, ......} , is divided into storage areas for a plurality of range of C ₈ .about.B _8, attack portion of the tone signal waveform diagram shown in Figure 2B, a plurality of PCM corresponding to the loop portion Waveform data is stored in advance. The loop unit is not limited to one cycle, and may store a plurality of cycles as the loop length.
Further, the PCM tone generator 7 sets one set of loop start address and loop end address (for example, a and b, c and d...) For looping (repeatably) reading out the loop portion of the PCM waveform data for each range. ... i and j) data (2nd B
(See the figure) and an envelope generator for generating an envelope signal. Then, the PCM waveform data corresponding to the range to which the pitch data received from the CPU 1 belongs is read out at a speed (frequency) corresponding to the pitch data, and digital data subjected to envelope control by an envelope signal is generated. Send it to A converter 9.

For example, when the pitch C ₄ is specified by operating the pitch specifying switch unit 5 and a breath operation is performed on the breath sensor 2 to perform note-on, the PCM musical tone generator 7 performs PCM based on the address specification from the CPU 1. from the waveform memory 8, and access the storage area of the waveform data corresponding to the tone range belongs pitch C ₄ (see FIG. 2A), breath loop portion between the loop start address a and the loop end address b Following the attack portion The data is read out in a loop for a predetermined time t corresponding to the operation (see FIG. 3A). Doing note-on addition of breath operation specifying the pitch C ₅ Similarly, PCM tone generator 7 loop start address c and the loop end address d of the waveform data corresponding to the tone range belongs pitch C ₅
The loop portion between them is read out in a loop (see FIG. 3 (2)).

The D / A converter 9 converts the digital data input from the PCM musical tone generator 7 into an analog signal, amplifies it with an amplifier 10, and then emits it as a musical tone through a speaker 11.

Here, for example, the case of playing the musical tone pitches C ₅ at legato in pronounced musical tone pitches C ₄ (if imparting pitch bend effect by operating the pitch bender or switch timbre and effect switch section 6, The same applies to the case where the portamento effect is applied by an operation) (see FIG. 4 (2)). As shown in PCM tone generator 7 4 (1), first in response to note-on of the tone pitch C _4, pitch waveform data corresponding to the tone range belongs pitch C ₄ in PCM waveform memory 8 It reads the waveform data at a read speed based on the C _4, to read by the loop between the loop portion from the loop start address a loop end address b Following the attack portion. And FIG. 4 (1),
In the middle of this loop operation, as shown in (2) When note-on pitch C ₅ by legato is made, at the time when the reading of the middle of the waveform data of the current loop is completed, i.e., the loop end address b is switched at the timing of reading the waveform data into the new waveform data corresponding to the tone range belongs pitch C ₅ in PCM waveform memory 8, the pitch between the loop start address c and the loop end address d of the new waveform data loop reads the read speed based on C ₅ (see FIG. 2B). Thus, PCM waveform memory 8 corresponding to the pitch C ₄
Corresponding to the waveform data and tone pitch C ₅ to read from the different waveform data from the waveform data read out from the PCM waveform memory 8.

Next, an example of a specific circuit configuration of the PCM tone generator 7 will be described with reference to FIG. In FIG. 5, a pitch data register PD1 is a register that receives pitch data from the CPU 1 based on a pitch designation operation of the pitch designation switch unit 5. The start address register SA stores the waveform data corresponding to the range to which the pitch data belongs in the PCM waveform memory 8.
This register receives a start address signal for reading from the CPU 1 from the CPU 1.

A loop start address register LSA1 and a loop end address register LEA1 are respectively provided with a loop start address signal for looping out the loop portion of the waveform data corresponding to the tone range to which the pitch data belongs from the PCM waveform memory 8, and a loop end address signal. This register receives the address signal from the CPU.

The gate G1 is an output gate provided on the output side of the start address register SA, which is opened for a moment by a note-on signal, and sends the start address signal set in the start address register SA to the current address register CA. The gate G2 is normally open, and is closed only momentarily by a note-on signal via the inverter I1.

The comparator CO receives a current address signal from the latch circuit LA, and normally outputs a signal “1”. The gate G3 is normally opened by the signal "1" from the comparator CO, and the address signal from the latch circuit LA is fed back to the current address register CA via the normally opened gates G3 and G2,
The data is added to the adder AD and added to the pitch data set in the pitch data register PD1, as described later.

The gate 4 is provided on the output side of the pitch data register PD1 and is opened by an output signal "0" from the control circuit 2 which is normally applied via an inverter I2. Is an output gate for sending to the adder AD. The adder AD is an adder for adding the current address signal set in the current address register CA and the pitch data passed through the gate G4 at a constant clock, thereby incrementing the current address signal at a speed based on the pitch data. is there. The result of accumulation by the adder is sequentially applied to the latch circuit LA. The latch circuit LA is a circuit for sending the current address signal stepped at a speed based on the pitch data to the PCM waveform memory 8 as a waveform data read address signal.

Gate G5 is connected to the loop end address register LEA1
, Which is opened by an output signal "0" from the control circuit 1 which is normally applied via an inverter I2, and which sends a loop end address signal to the comparator CO.

The comparator CO compares the current address signal and the loop end address signal. When it is determined that the two signals match, a coincidence signal that is instantly “0” is output. When the match signal “0” is output from the comparator CO, the gate G3 closes momentarily, and the gate G6 opens momentarily by the match signal “0” via the inverter I4.

The gate G7 is provided on the output side of the loop start address register LSA1, and is a gate which is opened by an output signal "0" from the control circuit 1 which is normally applied via the inverter I3.

Gate G6 is connected from comparator CO to inverter I4 as described above.
The gate which is open when receiving the match signal via
The loop start address signal previously set in the loop start address register LSA1 or the loop start address register LSA2 via G2 is added to the current address register CA as a loop start address signal for starting loop reading of the loop portion of the waveform data.

Thereafter, the current address signal is incremented by the adder AD, and when the match signal “0” is output again from the comparator CO, a loop start address signal is added to the current address register CA, and the gate G4 Is added to the pitch data which has passed through the step (a), and an address signal for reading the waveform data by the loop is advanced and sequentially sent to the PCM waveform memory 8.

The pitch data register PD2 is a register that receives pitch data from the CPU1.

The gate G8 is provided on the output side of the pitch data register PD2. Normally, "0" is latched in the flip-flop at the output stage of the control circuit 2, and the output gate closed by the output signal "0". It is.

When the control circuit 2 receives the pitch change instruction signal from the CPU 1, the flip-flop of the input stage A2 is set to output a signal "1", and the control circuit 2 outputs a coincidence signal from the comparator CO via the inverter I4. Upon receipt, the flip-flop of the input stage B2 is set and outputs a signal "1". That is, the control circuit 2 first receives the pitch change signal, and then, at the moment when the coincidence signal is received, the flip-flop of the output stage latches the signal “1”,
Next, the flip-flop of the input stage A2 is reset.

Then, the gate G4 is closed and the gate G8 is opened, the changed pitch data from the pitch data register PD2 is added to the adder AD, and the current address signal is incremented at a speed based on the new pitch data. Become.
The current address register CA receives the loop start address signal set in the loop start address register LSA1 as a current address signal every time the match signal “0” is output from the comparator CO as described above, and An address signal for reading data is sent to the PCM waveform memory 8 via the latch circuit LA.

Further, the loop start address register LSA2 and the loop end address register LEA2 loop the new waveform data loop portion in the PCM waveform memory 8 when changing the waveform data currently being read to different new waveform data and performing reading. The loop start address signal and loop end address signal for reading
Register received from U1.

The gate G9 and the gate G10 are provided on the output side of the loop end address register LEA2 and the loop start address register LSA2, respectively, and are normally closed by the output signal “0” from the control circuit 1.

When the control circuit 1 receives the waveform data change instruction signal from the CPU 1, the flip-flop of the input stage A1 is set and outputs a signal "1". Similarly, the control circuit 1 outputs a match signal from the comparator CO via the inverter I4. Is received, the flip-flop of the input stage B1 is set to output a signal "1". That is, the control circuit 1 first receives the waveform data change instruction signal, and then, at the moment when the coincidence signal is received, the flip-flop of the output stage outputs the signal “1”, and the flip-flop of the input stage B1 is also activated. Reset.

Then, the gate G5 and the gate G7 are closed, the gate G9 and the gate G10 are opened, and the loop end address signal is added to the comparator CO via the gate G9 from the loop end address register LEA2, and the loop start address register
The loop start address signal from the LSA2 passes through the gate 10, the gate G6, and the gate G2, and the current address register CA
Is added to

Operation Hereinafter, the operation of the electronic wind instrument according to the first embodiment will be described with reference to FIG. 5 based on the flowchart of FIG. 6 showing the operation of the pitch change control process for the musical tone being sounded by the CPU 1 shown in FIG. In this flowchart, a main flow (not shown) is interrupted by a timer interrupt.

First, it is determined whether or not the tone is currently being generated, that is, whether or not the PCM tone generator 7 is generating a tone signal (step S1). It is determined whether or not an instruction to change the pitch by legato playing, pitch bend operation, or the like has been given (step
S2). If YES is determined in step S2, the pitch data relating to the changed pitch is set in the register which is not currently being used, of the pitch data register PD1 or the pitch data register PD2 in the PCM tone generator 7, and a pitch change instruction is issued. A signal is sent to the control circuit 2 (step S3).

Subsequently, among the waveform data stored in the PCM waveform memory 8, the waveform assigned to the pitch after the pitch change and the waveform assigned to the pitch before the pitch change (of the currently sounding tone) are shown. It is determined whether they are the same (step S4). If YES is determined in step S4, only the pitch is changed, and the waveform does not need to be changed. Next, it is determined whether or not a match signal is output from the comparator CO (step S5). When the judgment is made, the process of step S5 is continued until the coincidence signal is output and the judgment is YES, and the process waits until the reading of the waveform advances to the loop end address. If YES, the output signal of the control circuit 2, for example, the output gate G4 provided on the output side of the pitch data register PD1 is switched and closed, and the gate G8, which is the output gate of the pitch data register PD2, is opened (step S6). , Change the pitch of the tone being sounded.

Next, "1" is set only when it is necessary to change the waveform assigned to the pitch when changing the pitch.
It is determined whether or not “1” is set in the flag F in which is set (step S7).
If it is determined to be YES in S4 and it is not necessary to change the waveform to be read to a new waveform, it is determined to be NO, and the flow directly returns to the main flow.

If NO is determined in step S4, it is necessary to switch the assigned waveform to a different waveform when changing the pitch, and the loop start address register LS
A1 or the loop start address register LSA2 is set to a register that is not currently in use and sets a loop start address signal for a new waveform after switching. Further, a loop end address signal relating to the waveform after switching is set to a register which is not currently being used, of the loop end address register LEA1 or the loop end address register LEA2. Further, the CPU 1 sends a waveform change instruction signal for changing the waveform to the control circuit 1 (step S8).

Then, after setting the flag F to "1" to clarify that the waveform must be changed in response to the pitch change (step S9), the process proceeds to step S5, and thereafter, similarly to steps S6 and S7. Perform processing. This time, in step S7, a determination of YES is made. For example, the gate G7 which is the output gate of the loop start address register LSA1 is output.
To open the gate G10, which is the output gate of the loop start address register LSA2, and further close the gate G5, which is the output gate of the loop end address register LEA1,
Gate control for opening the gate G9, which is the output gate of the loop end address register LEA2, is performed on the PCM tone generator 7 (step S10). And the flag F
Is reset to prepare for the next pitch change instruction (step S11), and the process returns to the main flow.

If NO is determined in step S1, since the musical tone is not being generated, the process directly returns to the main flow.
If NO is determined in S2, the pitch change is not instructed for the tone being sounded, that is, it is not necessary to change the pitch by legato playing etc.
After all, it returns to the main flow.

As described above, according to the electronic wind instrument according to the first embodiment, a legato playing method for smoothly changing the pitch of a musical tone being produced, a pitch bend operation using a pitch bender, or a portamento switch is used. When the performance by the portamento technique or the like is performed, if it is not necessary to change the waveform assigned to the pitch to be changed in the PCM waveform memory 8 and change the pitch in accordance with the change in the pitch, the loop section currently being read out may be used. Wait until the reading up to the loop end address is completed, and then change only the pitch. If the waveform should be changed along with the pitch change, similarly wait until the reading up to the loop end address is completed. , Not only the pitch but also the waveform was changed.

Therefore, in a performance in which a smooth pitch change such as legato playing is performed, unnecessary tone changes do not occur for a moment as shown in FIG. 9 (2).
A natural tone change is obtained before and after the pitch change.

<Second Embodiment> Configuration Next, the configuration of an electronic wind instrument according to a second embodiment to which the musical tone signal generating device of the present invention is applied will be described. The overall circuit block diagram of this electronic wind instrument relates to the above-described first embodiment. It is the same as FIG. 1, and the description is omitted. An example of a specific circuit configuration of the PCM tone generator 7 in the electronic wind instrument according to the second embodiment will be described with reference to FIG. 7. In FIG. 7, FIG. Those denoted by the same reference numerals have the same functions, and only different points will be described below.

The difference between the overall circuit block diagram shown in FIG. 7 and the first embodiment shown in FIG.
And there is no control circuit for switching control of the output gate of the pitch data register.

That is, only one pitch data register PD is
At the moment when the new pitch data is received, the new pitch data is sent to the adder AD, and the increment of the current address signal from the current address CA is immediately executed based on the new pitch data.

Operation Hereinafter, the operation of the electronic wind instrument according to the second embodiment will be described with reference to FIG. 7 based on a flowchart showing the operation of the pitch change processing of the CPU 1 shown in FIG. In FIG. 8, steps denoted by the same reference numerals as those in FIG. 6 according to the first embodiment indicate processing steps having the same functions, and only different points will be described below.

The difference between the flowchart shown in FIG. 8 and the flowchart shown in FIG. 6 is that step S6 in FIG.
Is not present. That is, the output gate switching process of the pitch data register is not performed, and the PCM
When the tone generator 7 determines that an instruction to change the pitch of the tone signal has been received in step S2 while the tone generator 7 is generating the tone signal, the changed pitch data is set in the pitch data register PD in step S3. Make changes. After that, the processing of steps S7 to S11 as described above is performed, and if necessary, the change of the waveform to be read at the timing of the loop end address is executed.

As described above, in the electronic wind instrument according to the second embodiment, when a performance in which the pitch is changed during the tone generation is performed, only the pitch is always changed immediately at that moment, and the pitch is assigned to the changed pitch in the PCM waveform memory 8. Waveform
When the pitch needs to be changed in accordance with the change of the pitch, the waveform is also changed after reading to the loop end address is completed.

Therefore, also in the second embodiment, a natural tone color change can be obtained before and after the pitch change.

<Other Embodiments> In the first and second embodiments, the PCM waveform memory 8 stores a plurality of PCM waveform data corresponding to a plurality of tone ranges by dividing the area. The memory 8 may be configured to store only one PCM waveform data common to all sound ranges. And the PCM musical tone generator 7
When a performance requesting a pitch change is performed while a tone signal is being generated, the pitch is not immediately changed as shown in the second embodiment, but the pitch is changed as shown in the first embodiment. As described above, the configuration may be such that the pitch is changed after waiting until the timing when the waveform data is read up to the loop end address. As a result, the pitch is changed without causing an unnecessary change in tone color for a moment as shown in FIG. 9 (2). As described later, the pitch may be changed at the timing when the zero cross point is read instead of the loop end address.

In the first and second embodiments, the PCM tone generator 7 has a loop reading function of repeatedly reading out (looping) a predetermined loop portion when reading waveform data from the PCM waveform memory 8. However, for example, as described above, if the zero cross point is used as the switching timing, it is possible to read out the waveform data from the PCM waveform memory in which the waveform data is stored for a time sufficient to maintain the generation of the tone signal. It may be a configuration.

Further, in the first and second embodiments, when a pitch change operation for changing the pitch of the tone signal being generated to a new pitch belonging to a range different from the range to which the tone belongs is performed. The PCM tone generator 7 switches the waveform data to be read out in a loop from the waveform data corresponding to the range to which the pitch of the tone signal currently being generated belongs to the new waveform data corresponding to the range to which the new pitch belongs. In this case, the switching is performed after waiting for the timing at which the waveform data at the loop end address is read. However, if it is possible to smoothly connect the waveforms without performing such a standby, the switching may be performed immediately. In this case, the timbre can be changed quickly with the change of the pitch, and the current address signal and The comparator CO for detecting the coincidence of the loop end address signal is not required, and the configuration of the PCM tone generator 7 is simplified.

In the first and second embodiments, as described above,
When switching to new waveform data, the waveform data is switched at the timing of reading the waveform data at the loop end address.
It is not always necessary to switch to waiting until the loop end address, and the waveform data is switched at the timing when the PCM tone generator 7 reads out the zero-level waveform data, that is, at the timing when the zero-cross point waveform data is read out. (In the example shown in FIG. 4, the loop end address matches one of the zero cross points.) In the detection of the zero crossing point, the simplest known method is to check whether the positive and negative signs of two waveform data corresponding to two adjacent addresses of the storage area in the PCM waveform memory 8 have been inverted. Can be done by

Now, for example, the waveform data is digital data in a two's complement representation, and its MSB (highest digit) is a sign bit. When "0" is a positive number, and when "1", a negative number is a negative number. Shall be expressed. This code bit is monitored in response to the addressing, and the code bit corresponding to the immediately preceding address is latched in, for example, a flip-flop. If the corresponding sign bit is "0", it means that a zero cross point has been detected.

Further, in the above embodiment, the waveform data is stored by the PCM method, but a recording method by other digital expressions such as the D-PCM method can be adopted.

In each of the above embodiments, the present invention is applied to an electronic wind instrument. However, the present invention is not limited to an electronic wind instrument, and can be applied to various electronic musical instruments such as an electronic keyboard instrument and an electronic string instrument.

[Effect of the Invention] As described above, according to the first aspect of the present invention, the tone to be changed to a new tone belonging to a tone range different from the tone range to which the tone signal being generated belongs. When the pitch change operation is performed, the reading means waits until the detection of the loop end address and then reads the waveform data to be read from the storage means from the waveform data corresponding to the tone range to which the pitch of the tone signal being generated belongs. The waveform data is switched to new waveform data corresponding to the tone range to which the new pitch belongs, and the new waveform data switched by the switching means is read out by the reading control means based on the frequency corresponding to the new pitch. The reading means is controlled.

Therefore, when a pitch changing operation is performed to change the pitch of a musical tone being sounded, not only the pitch is changed, but also a natural tone change before and after the pitch change is obtained. This change in timbre is made at the timing corresponding to the loop end address, so that unnecessary timbres are not generated, and the performance corresponding to the legato playing method, pitch bend operation, etc. with more preferable natural timbre changes The effect is obtained.

Further, in the invention according to claim 3, when the pitch change operation for changing the pitch of the tone signal being generated to a new pitch is performed, the read means sets the loop of the storage means. At the timing when the waveform data at the end address is read, the read means has control means for controlling the read means so as to read the waveform data from the storage means based on the frequency corresponding to the new pitch.

Therefore, the pitch change is performed at the timing corresponding to the loop end address.
A tone signal generating device capable of smoothly changing the pitch corresponding to legato playing, pitch bend operation, etc., without generating an unwanted tone in a moment.

Further, when the pitch change operation for changing the pitch of the musical tone signal being generated to a new pitch is performed by the read means, the read means causes the storage means to perform zero-crossing. At the timing when the waveform data at the point is read, the read means has control means for controlling the read means so as to read the waveform data from the storage means based on the frequency corresponding to the new pitch.

Therefore, since the pitch change is performed at the timing corresponding to the reading of the zero cross point where the level of the waveform data is zero, the pitch change is quickly performed without waiting until the timing corresponding to the loop end address,
In addition, a musical tone signal generator capable of smoothly changing a pitch corresponding to a legato playing method, a pitch bend operation, or the like without generating an unwanted musical tone for a moment is obtained.

[Brief description of the drawings]

1 to 6 are views for explaining an electronic wind instrument according to a first embodiment of the present invention. FIG. 1 is a block diagram of an entire circuit of the electronic wind instrument, and FIG. illustrates another storage area, Figure 2B shows a musical sound signal waveform corresponding to the PCM waveform data stored by range, Figure 3 is a loop at a rate corresponding to the tone pitch C ₄ and pitch C ₅ FIG. 4 is a diagram for explaining the PCM waveform data read and read, and FIG. 4 is a diagram illustrating a pitch change and a change in waveform data when a musical tone having a pitch C _{4 being} generated is changed to a pitch C _5. FIG. 5 is a circuit configuration diagram showing an example of a specific circuit configuration of the PCM musical tone generating device 7, and FIG. 6 is a diagram for explaining pitch change control processing for musical tones generated by the CPU 1. FIG. 7 is a flowchart of a PCM tone generator 7 for an electronic wind instrument according to a second embodiment of the present invention. Circuit diagram showing an example of a body circuit configuration, FIG. 8 is CPU1 in the second embodiment
FIG. 9 is a flowchart for explaining the pitch change in the conventional tone signal generating apparatus. 1 ... CPU, 5 ... Pitch designation switch section, 6 ... Tone /
Effect switch section, 6-2 ... Pitch bender, 6-3 ...
... Portamento setting switch, 7 PCM tone generator, 8 PCM waveform memory.

 ──────────────────────────────────────────────────続 き Continuation of front page (56) References JP-A-59-231295 (JP, A) JP-A-62-3298 (JP, A) JP-A-62-121496 (JP, A) JP-A-62 86394 (JP, A) JP-A-61-177490 (JP, A) JP-B-63-62759 (JP, B2) JP-B-63-67196 (JP, B2)

Claims (3)

(57) [Claims] A different waveform data is stored for each of a plurality of tone ranges. Each waveform data is specified by a pitch data specifying operation by a waveform data storing means comprising an attack portion and a waveform data of a loop portion following the attack portion. Reading means for sequentially addressing and reading the waveform data corresponding to the pitch range to which the pitch belongs based on the frequency corresponding to the specified pitch; and a sound for which the currently specified waveform data is being read. When a pitch change operation for changing the pitch to a new pitch belonging to another range is performed, the loop portion of the designated address of the waveform data that is currently read after this pitch change operation is performed. Detecting means for detecting that the loop end address has been reached, and controlling the reading means upon detection by the detecting means to replace the waveform data currently read by the reading means with the sound data. Newly redesignated waveform data a new pitch changed by changing the operation corresponds to the range that belong,
Control is performed such that the address from the loop start address to the loop end address of the loop portion of the newly designated waveform data is sequentially designated at a frequency corresponding to the changed new pitch, and is read by the reading means. A tone signal generating device, comprising: control means; 2. A waveform data storage means for storing waveform data of an attack part and a loop part following the attack part, and converting the waveform data stored in the waveform data storage means to a pitch designated by a pitch designation operation. A reading means for sequentially addressing and reading based on the corresponding frequency, and a pitch changing operation for changing the pitch at which the currently specified waveform data is being read to another new pitch are performed. Detecting means for detecting that the designated address of the waveform data currently being read after the pitch change operation has been performed has become the loop end address of the loop portion; Controlling the reading means so as to sequentially address the waveform data currently read by the reading means at a frequency corresponding to the changed new pitch and to read the waveform data by the reading means. Further comprising control means for, the musical tone signal generating apparatus according to claim. 3. A waveform storage means for storing waveform data, and the waveform data stored in the waveform data storage means are sequentially addressed based on a frequency corresponding to a pitch designated by a pitch designation operation. Reading means for reading and reading, and when a pitch changing operation for changing the pitch currently being read out of the designated waveform data to another new pitch is performed, this pitch changing operation is performed. Detecting means for detecting that the designated address of the waveform data which is currently read after the data has been formed has reached a zero crossing point; and when detecting by the detecting means, controlling the reading means, and Control means for sequentially addressing the read-out waveform data at a frequency corresponding to the changed new pitch and controlling the read-out means to read out the read-out waveform data. Generator.