JP5151523B2 - Electronic musical instruments - Google Patents

Description

  The present invention relates to an electronic musical instrument that samples external sound.

  Digital audio signal data obtained by receiving an audio signal from a microphone or an audio playback device and A / D converting the audio signal is stored in the RAM as waveform data, and the waveform data stored in the RAM is stored on the keyboard. Electronic musical instruments are known that are used for performances in Japan or as timbres for automatic accompaniment.

  For example, in Patent Document 1, a specific pitch is assigned to waveform data recorded in a recording memory, and a pitch specified by a performance (for example, a pitch specified by a pressed key) and the above-mentioned There is disclosed a technique for generating musical tone signal data having a pitch different from the pitch of the original waveform data by changing the reading speed of the waveform data recorded in the recording memory according to the assignment. As described above, in an electronic musical instrument that employs a sampling method, it is common to output musical tone signal data having different pitches by changing the reading speed of specific waveform data.

Further, Patent Document 2 proposes a technique for automatically storing all waveform data corresponding to performance operators such as keyboards of other musical instruments in association with pitches in a memory. By using such a technique, it is possible to output musical tone signal data having a predetermined pitch without changing the reading speed as described above.
Japanese Patent Publication No. 63-62759 Japanese Patent Laid-Open No. 5-46177

  In a musical instrument having a certain pitch feeling, such as a piano or guitar, it is desirable to change the waveform data read speed according to the pitch of the depressed key and generate musical tone signal data as described above. On the other hand, even a musical instrument having a feeling of pitch as described above, a percussion instrument sound such as a phrase by a relatively long performance, an ensemble by a plurality of musical instruments, a bass drum, a snare drum, and a cymbal has a specific pitch. Since it is difficult to correlate or the pitch feeling is poor, it is very difficult to correlate specific pitches with waveform data and generate musical tone signal data that changes the reading speed according to the pitch of the pressed key. In many cases, the sound becomes unnatural.

  Conventionally, for a musical tone that is difficult to be associated with a specific pitch as described above or has a poor pitch feeling, the player reads the sampled waveform data as it is without changing the pitch by operating a switch or the like. It was set as follows. However, there is a problem that it is troublesome for the performer to operate the switch each time.

  An object of the present invention is to provide an electronic musical instrument that can select a performance form suitable for a musical tone to be sampled without troublesome operations.

An object of the present invention is an electronic musical instrument for generating musical tone signal data based on a depressed key,
Input interface means for accepting external audio signal input and outputting as digital audio signal data;
Sampling means for storing audio signal data output from the input interface means as waveform data in a sampling data area of a waveform RAM;
Based on the depressed key, the musical tone generating means for reading out the waveform data stored in the sampling data area of the waveform RAM and generating musical tone signal data based on the waveform data, and
The musical tone generator has a musical sound waveform in which the waveform data has a constant pitch according to a determination result of whether or not the waveform data stored in the sampling area of the waveform RAM is a musical sound waveform having a fixed pitch. If it is generated musical tone signal data of the pitch according to the pressed key, and the waveform data is not a musical sound waveform having a certain pitch, regardless of the pressed key, This is achieved by an electronic musical instrument characterized by generating musical tone signal data based on the pitch of the waveform data itself.

  In a preferred embodiment, when the musical sound generating means is not a musical sound waveform having a certain pitch, the reproduction speed is not depressed, and the reproduction speed is not depressed. The tone signal data adjusted according to the pitch of the key is generated.

In a more preferred embodiment, the musical sound generating means includes a reference pitch pre-associated with the waveform data and a pitch of the depressed key based on the pitch of the depressed key. If the reference pitch matches the tone signal data, the waveform data is generated as it is as a tone signal, and the playback speed increases as the pitch of the pressed key increases. Is generated.

  In another preferred embodiment, the sampling means performs LPF processing on at least a part of the waveform data, refers to the waveform data subjected to the LPF processing, finds a predetermined number of peak values, and sets adjacent peak values. If the fluctuation of each time interval is within a predetermined range, it is determined that the waveform data has a certain pitch.

  ADVANTAGE OF THE INVENTION According to this invention, it becomes possible to provide the electronic musical instrument which can select the performance form suitable for the musical sound to sample, without troublesome operation.

  Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a block diagram showing a configuration of an electronic musical instrument according to an embodiment of the present invention. As shown in FIG. 1, the electronic musical instrument 10 according to the present embodiment includes a CPU 11, a ROM 12, a RAM 13, a sound system 14, a display unit 15, an input I / F 16, a keyboard 17, and an operation unit 18.

  The CPU 11 controls the electronic musical instrument 10 as a whole, detects a key depression of the keyboard 17 and an operation of a switch (not shown) constituting the operation unit 18, controls the sound system 14 according to the operation of the keyboard 17 and the switch, Sampling processing of an audio signal input from a microphone 24 or the like described later is executed.

  The ROM 12 stores programs for performance processing and sampling processing to be executed by the CPU 11. The RAM 13 stores a program read from the ROM 12 and data generated in the course of processing. The ROM 12 stores waveform data for generating musical sounds such as a piano, guitar, bass drum, snare drum, and cymbal. The RAM 13 also has a sampling data area for storing sampled waveform data.

  The sound system 14 includes a sound source unit 21, an audio circuit 22, and a speaker 23. For example, when the tone generator 21 receives the pitch information of the depressed key from the CPU 11, the tone generator 21 reads the waveform data from the data area of the ROM 12 or the RAM 13, and generates musical tone signal data according to the pitch of the depressed key. Generate and output. The sound source unit 21 can also output the waveform data as music data as it is. The audio circuit 22 D / A converts and amplifies the musical sound signal data. Thereby, an acoustic signal is output from the speaker 23.

  A microphone 24 is connected to the input I / F 16. The input I / F 16 includes an external input terminal (not shown) and can receive a signal from an audio device. The audio signal input to the input I / F 16 is A / D converted into digital data.

  The electronic musical instrument 10 according to the present embodiment generates a musical tone based on the key depression of the keyboard 17. Further, the electronic musical instrument 10 is configured to play a certain rhythm pattern by generating a drum tone of a bass drum tone or a snare drum tone at a predetermined timing by operating an automatic accompaniment switch in the operation unit 18. Is also possible.

  FIG. 2 is a flowchart showing processing executed by the electronic musical instrument 10 according to the present embodiment. As shown in FIG. 2, the CPU 11 of the electronic musical instrument 10 performs an initialization process including clearing a flag in the RAM 13 used in the process (step 201). When the initialization process 201 ends, the CPU 11 detects a switch operation of the operation unit 18 and executes a switch process for executing a process according to the detected operation (step 202).

  Next, the CPU 11 generates image data to be displayed on the display unit 15 and displays it on the screen of the display unit 15 (step 203). On / off of the LED arranged adjacent to the switch of the operation unit 18 is also performed in step 203. Thereafter, the CPU 204 stores the digitized data of the audio signal input via the input I / F 16 in a predetermined sampling data area in the RAM 13 (step 204), and predetermined data in the ROM 12 The waveform data stored in the area and the waveform data stored in the predetermined sampling data area of the RAM 13 are read out, and a performance process (step 205) for generating musical tone signal data is executed. The sampling process (step 204) and the performance process (step 205) will be described in detail later.

  Thereafter, the CPU 11 performs other processes necessary for operating the electronic musical instrument 10 (step 206), and returns to step 202.

  In the switch process (step 202), although not shown, the CPU 11 checks the operation status of the switch unit 18 and determines whether or not the sampling switch has been pressed. When the sampling switch is turned on, the CPU 11 inverts the sampling flag SF in the RAM 13. That is, if SF = 1, SF = 0, while if SF = 0, SF = 1. In the present embodiment, the sampling switch operates cyclically. When the sampling switch is turned on once from the initial state, it indicates that sampling is being performed. When the sampling switch is turned on once again, the sampling operation is completed.

  In the switch process, pressing of other switches such as an automatic accompaniment switch and a tempo switch is detected, and necessary processes are executed according to the pressing of each switch. In the switch process, the CPU 11 detects on / off of the keyboard. The information on the key that has been turned on (pressed) and the information on the key that has been turned off (released) are stored in the RAM 13 for use in later performance processing. Since the switch process is the same as that of a conventional electronic musical instrument, detailed description thereof is omitted.

  Next, sampling processing according to the present embodiment will be described. FIG. 3 is a flowchart showing an example of sampling processing according to the present embodiment. As shown in FIG. 3, in the sampling process, the CPU 11 first determines whether or not the sampling flag SF is “1” (step 301).

  When it is determined Yes in step 301, it is determined whether or not the flag SSF indicating that sampling is being performed is “1” (step 302). If Yes in step 301 and No in step 302, it indicates that the sampling switch is on but sampling has not yet started. Therefore, the CPU 11 determines whether or not the level of the audio signal input to the input I / F 16 has exceeded a predetermined value (step 303). If it exceeds (Yes in step 303), it indicates that sampling is in progress. The flag SSF is set to “1” (step 304). If it is determined No in step 303, the process ends.

  Next, the CPU 11 writes the audio signal data received from the input I / F 16 in the sampling data area of the RAM 13 (step 305). The CPU 11 determines whether or not the level of the audio signal input to the input I / F 16 is equal to or lower than a predetermined value (step 306). If YES is determined in step 306, the CPU 11 executes a pitch fixing flag generation process (step 308) described later and resets both the sampling flag SF and the flag SSF to “0” (step 309). .

  If it is determined No in step 306, the CPU 11 refers to the address of the sampling data area of the RAM 13 being written and determines whether or not the audio signal data has been written to the end of the sampling data area ( Step 307). Even when it is determined Yes in step 307, the CPU 11 executes a pitch fixing flag generation process (step 308) described later and resets both the sampling flag SF and the flag SSF to “0” (step 309). . Thereafter, the sampling process ends.

  If No in step 306 and No in step 307, the sampling process ends without passing through the fixed pitch flag generation process and the resetting of flags SF and SSF. In the sampling process, the fixed pitch flag generation process is performed only when the process is finished, that is, when the audio signal level becomes a predetermined value or less and when the waveform data is stored to the end of the sampling data area. After that, the flags SF and SSF are reset.

  FIG. 4 is a flowchart showing an example of the pitch fixed flag generation process according to the present embodiment. As shown in FIG. 4, the CPU 11 reads the audio signal data (waveform data) stored in the sampling data area and performs frequency analysis on the waveform data (step 401).

  In the frequency analysis (step 401), for example, the CPU 11 executes the following processing on the waveform data. The CPU 11 performs LPF (low-pass filter) processing on the waveform data, removes high-order harmonic components, and generates data including only predetermined frequency components. Thereafter, the CPU 11 refers to the generated data, finds a predetermined number of peak values, and acquires a time interval between adjacent peak values. If the obtained variation of each time interval is within a predetermined range, the CPU 11 determines that the waveform data is a musical sound waveform having a certain pitch (referred to herein as a “single speech waveform”). To do. On the other hand, if the variation of each time interval is not less than a predetermined range, the waveform data is determined to be a musical sound waveform having no fixed pitch.

  More specifically, it is desirable to perform LPF processing on the portion of the waveform data that is considered to be in a steady state, except for the beginning portion of the waveform data having a predetermined length. If the 61-note keyboard instrument has a maximum frequency of approximately 2 kHz and a piano (88 keys), the maximum frequency is approximately 4 kHz. Accordingly, the LPF cutoff may be about 2 to 4 kHz. Furthermore, in a steady state of a single speech waveform, the pitch variation is considered to be within a semitone (100 cents), so the range of the time interval variation corresponds to a quarter tone (50 cents). Time is desirable. Note that LPF processing may be performed on a portion of the waveform data excluding at least the head portion having a predetermined length.

  The CPU 11 determines whether the waveform data is a single speech waveform based on the processing result of step 401 (step 402). If YES is determined in step 402, the pitch fixing flag in the RAM 13 is set to “OFF” for the sampled waveform data (step 403). Actually, the fixed pitch flag in the RAM 13 may be set to “0”. On the other hand, when it is determined No in step 402, the pitch fixing flag is set to “on” (the pitch fixing flag in the RAM 13 is set to “1”) (step 404). The pitch fixing flag is referred to in performance processing described later, and is used to determine whether or not a musical tone to be generated should change its pitch (pitch) in accordance with the depressed key.

  FIG. 6 shows a case where a musical tone obtained by playing a single musical instrument capable of changing the pitch at a certain pitch is sampled, its waveform data is stored in the sampling data area of the RAM 13, and the waveform data is subjected to LPF processing. It is a figure which shows the example of a waveform. In the example shown in FIG. 6, the interval between the peak values (see, for example, reference numerals 601, 602, and 603) is substantially constant, and the variation thereof is within a predetermined range. Therefore, the pitch fixing flag is set to “off”.

  FIG. 7A shows the sampling of a cymbal musical tone with a poor pitch feeling (or basically no pitch change is possible) even with a single musical instrument, and stores the waveform data in the sampling data area of the RAM 13. It is a figure which shows the example of a waveform when the LPF process is performed to the said waveform data. In the example of FIG. 7A, the variation in the interval between the peak values is large (see reference numerals 701, 702, and 703), and therefore the pitch fixing flag is set to “ON”. FIG. 7 (b) shows that even a single musical instrument samples a voice with a large pitch change such as one phrase of music and stores the waveform data in the sampling data area of the RAM 13, and the LPF is stored in the waveform data. It is a figure which shows the example of a waveform when a process is performed. Also in this example, similarly to FIG. 7A, the variation in the interval between the peak values is large, and the pitch fixing flag is set to “ON”.

  Thus, in this embodiment, if the waveform data stored in the sampling data area of the RAM 13 by sampling is a musical sound waveform having a certain pitch, the pitch fixing flag is set to “off” for the waveform data. If the tone waveform does not have a certain pitch, the fixed pitch flag is set to “ON” for the waveform data.

  Next, the performance process (step 205) according to the present embodiment will be described. FIG. 5 is a flowchart showing an example of performance processing according to the present embodiment. As shown in FIG. 5, the CPU 11 determines whether or not any key on the keyboard 17 has been depressed (step 501). If it is determined Yes in step 501, the CPU 11 determines whether or not waveform data has been stored in the sampling data area of the RAM 13 (step 502).

  When it is determined No in step 502, that is, when waveform data is not stored in the sampling data area of the RAM 13, or when waveform data is being stored, the CPU 11 determines the pitch information of the key. To the sound source unit 21 to instruct sound generation using predetermined waveform data in the ROM 12. The sound source unit 21 reads the waveform data stored in the ROM 12, and generates musical tone signal data corresponding to the pitch of the pressed key based on the read waveform data and pitch information (step 503).

  If it is determined Yes in step 502, that is, if the waveform data has already been stored in the sampling data area of the RAM 13, the CPU 11 determines whether the pitch fixing flag of the RAM 13 is on or off. (Step 504). If it is determined in step 504 that the fixed pitch flag is on, the CPU 11 instructs the sound generation using the waveform data in the sampling data area of the RAM 13 as it is. The sound source unit 21 reads the waveform data in the sampling data area of the RAM 13 and uses the read waveform data as it is as musical tone signal data (step 505). On the other hand, if it is determined in step 504 that the fixed pitch flag is in the OFF state, the CPU 11 notifies the tone pitch information of the key to the sound source unit 21 and generates sound using the waveform data in the sampling data area of the RAM 13. Instruct. The sound source unit 21 reads the waveform data in the sampling data area of the RAM 13, and generates musical tone signal data corresponding to the pitch of the depressed key based on the read waveform data and pitch information (step 506).

  After such processing, the CPU 11 executes sound generation processing for other musical sounds to be generated, for example, musical sounds constituting an automatic accompaniment pattern that has reached the sound generation timing (step 507).

  As described above, in the present embodiment, when the waveform data stored in the sampling data area of the RAM 13 is read and pronounced, if the pitch fixing flag is in the OFF state, the key is pressed in the same manner as a normal key depression. Musical tone signal data whose pitch is changed in accordance with the pitch of is generated. On the other hand, if the pitch fixing flag is on, the same musical tone signal data corresponding to the waveform data is generated regardless of the pitch of the key pressed.

  In step 506, the sampling audio signal is associated with the pitch of the key, and the pitch of the key is stored in the RAM 13 as reference information. It is desirable to change the reading speed of the waveform data based on the pitch of the key that has been keyed, and generate musical tone signal data corresponding to the pitch of the key that has been pressed.

  According to the present embodiment, it is determined whether or not the waveform data stored in the sampling data area of the RAM 13 is the waveform data of a musical tone having a constant pitch feeling, and the waveform data of a musical tone having a constant pitch feeling is determined. For waveform data, the waveform data readout speed is changed based on the pitch of the pressed key, and the tone waveform data is output according to the pitch, while the waveform data of the tone without a certain pitch is output. The musical tone signal data is generated without changing the reading speed regardless of the pitch of the depressed key. Therefore, it is possible to generate musical tone signal data in an optimum performance form corresponding to the sampled musical tone without requiring a user to perform a switch switching operation.

  In the sampling processing according to the present embodiment, LPF processing is performed on at least part of the waveform data, the waveform data subjected to the LPF processing is referred to, a predetermined number of peak values are found, and adjacent peak values are When the time interval between them is acquired and the variation of each time interval is within a predetermined range, it is determined that the waveform data has a certain pitch (has a pitch feeling). In this way, it is possible to appropriately determine whether or not the waveform data has a pitch feeling by simple processing.

  Next, a second embodiment of the present invention will be described. In the first embodiment, the sampled waveform is read as it is for the waveform flag for which the pitch fixing flag is on, but in the second embodiment, the playback speed is maintained without changing the pitch (pitch). Is adjusted based on the pitch of the pressed key so that the playback speed increases and the pronunciation time decreases as the pitch of the key increases.

  In the second embodiment, for example, in the sampling process, the audio signal to be sampled is associated with the pitch of the key, and the pitch of the key is stored in the RAM 13 as reference information. deep. For example, when the player presses a desired key during the sampling process, the pitch of the key pressed by the CPU 11 can be used as the reference information.

  FIG. 8 is a flowchart showing an example of performance processing according to the second embodiment of the present invention. In FIG. 8, Steps 801 to 804, Step 806 and Step 807 are the same as Steps 501 to 504, Step 506 and Step 507 in FIG. That is, if the waveform data is not stored in the sampling data area of the RAM 13 (No in step 802), the CPU 11 notifies the tone generator 21 of the key pitch information and generates a sound using the predetermined waveform data in the ROM 12. Instruct. The sound source unit 21 reads out the waveform data stored in the ROM 12, and generates musical tone signal data corresponding to the pitch of the depressed key based on the read waveform data and pitch information (step 803). If YES is determined in step 802 and the pitch fixing flag is OFF, the CPU 11 notifies the tone pitch information of the key to the sound source unit 21 and the waveform data in the sampling data area of the RAM 13 is displayed. Indicate the pronunciation used. The sound source unit 21 reads the waveform data in the sampling data area of the RAM 13, and generates musical tone signal data corresponding to the pitch of the pressed key based on the read waveform data and pitch information (step 806).

  On the other hand, if it is determined in step 804 that the fixed pitch flag is on, the CPU 11 notifies the tone generator 21 of the pitch information of the key, and does not change the pitch of the waveform data. Instructs the sound generation at the playback speed according to the pitch of the key. The sound source unit 21 reads the waveform data in the sampling data area of the RAM 13 and reproduces it as the pitch of the depressed key increases, while keeping the pitch (pitch) based on the reference information and the pitch information. The reproduction speed is adjusted so as to increase the speed, and musical tone signal data is generated (step 805). Note that if the pitch information about the pitch of the pressed key matches the reference information, the waveform data is output as it is as a musical tone signal.

  For example, the sound source unit 21 executes the following processing in step 805. First, the sound source unit 21 decomposes the read waveform data into a plurality of blocks, applies a window function to each block, and generates a plurality of blocks to which the window function is applied. Next, the sound source unit 21 calculates a difference or ratio between a predetermined reference pitch and the pitch of the pressed key, and overlaps a predetermined block based on the calculated difference or ratio. The musical tone signal data is generated by skipping playback of one or more blocks.

  FIG. 9 is a diagram showing envelopes of musical tone signal data based on reference waveform data and musical tone signal data having different reproduction speeds. If the pressed key is a pitch one octave lower than the pitch based on the reference information, for example, by reading the same block twice, the reference waveform data (see reference numeral 901) is shown in FIG. ), It is possible to generate musical tone signal data (see reference numeral 902) having a reproduction speed of 1/2 (double sounding time). If the pressed key is one octave higher than the reference pitch, musical tone signal data at twice the playback speed (1/2 pronunciation time) is obtained by reading out every other block. (See reference numeral 903) can be generated. Note that the selection of blocks to be read redundantly and the selection of blocks to be omitted are not limited to those described above.

  According to the second embodiment, for a musical sound with a poor pitch feeling, the pitch itself is not changed, and only the playback speed (sounding time) is changed based on the pitch of the key pressed. Yes. As a result, the performer can generate a desired musical tone using the electronic musical instrument.

  In the embodiment, the pitch of the key pressed and the reference pitch based on the reference pitch previously associated with the waveform data and the pitch of the pressed key. Is generated as a musical tone signal as it is, and musical tone signal data is generated so that the playback speed increases as the pitch of the depressed key increases. As a result, the playback speed (sounding time) can be adjusted according to the pitch without changing the pitch itself, so that the range of performance by the performer can be widened.

  The present invention is not limited to the above embodiments, and various modifications can be made within the scope of the invention described in the claims, and these are also included in the scope of the present invention. Needless to say.

  In the embodiment, in the frequency analysis (step 401), the CPU 11 performs LPF (low-pass filter) processing on the waveform data to remove high-order overtone components, and only a predetermined frequency component. Then, the CPU 11 refers to the generated data, finds a predetermined number of peak values, and acquires a time interval between adjacent peak values. Based on this time interval, it is determined whether or not it is a single speech waveform. However, it is not limited to such a configuration.

  For example, all or a predetermined portion of the waveform data may be subjected to Fourier transform to determine whether the waveform is a single speech waveform based on the regularity of the fundamental tone and the harmonic overtone. For example, the CPU 11 refers to the level on the frequency axis obtained by the Fourier transform, specifies the peak that appears first, and then the peak value that appears thereafter is an integer multiple of the frequency at which the peak value first appears. It is determined whether or not the frequency is within a predetermined range (frequency of integer overtone). If the frequency at which the peak value appears is within a predetermined range of the frequency of integer overtones, the CPU 11 determines that the waveform data is a musical sound waveform (single speech waveform) having a certain pitch, and is associated with the waveform data. The pitch fixing flag is set to “ON”. On the other hand, if the frequency at which the peak value appears is not within the predetermined range of the frequency of the integer overtone, the CPU 11 determines that the waveform data is not a musical sound waveform (single speech waveform) having a certain pitch, and The fixed pitch flag associated with the waveform data is set to “off”.

  The electronic musical instrument according to the present invention can be operated in two operation modes. In the first operation mode, if the pitch fixed flag is on according to the first embodiment, the waveform data is directly used as the musical tone signal data. On the other hand, in the second operation mode, according to the second embodiment, if the pitch fixing flag is ON, the musical sound waveform data in which the reproduction speed is adjusted according to the pitch of the depressed key May be generated.

  The operation mode can be switched by the player operating a predetermined switch of the operation unit 18. With such a configuration, the performer can select a desired performance form.

FIG. 1 is a block diagram showing a configuration of an electronic musical instrument according to an embodiment of the present invention. FIG. 2 is a flowchart showing processing executed by the electronic musical instrument according to the present embodiment. FIG. 3 is a flowchart showing an example of sampling processing according to the present embodiment. FIG. 4 is a flowchart showing an example of the pitch fixed flag generation process according to the present embodiment. FIG. 5 is a flowchart showing an example of performance processing according to the present embodiment. FIG. 6 shows a case where a musical tone obtained by playing a single musical instrument capable of changing the pitch at a certain pitch is sampled, its waveform data is stored in a sampling data area of the RAM, and the waveform data is subjected to LPF processing. It is a figure which shows the example of a waveform. 7 (a) and 7 (b) are respectively a cymbal musical sound with a poor pitch feeling even with a single instrument, and a voice with a large pitch change such as one phrase of a musical piece even with a single instrument. Is a diagram illustrating an example of a waveform when the waveform data is stored in the sampling data area of the RAM and the waveform data is subjected to LPF processing. FIG. 8 is a flowchart showing an example of performance processing according to the second embodiment of the present invention. FIG. 9 is a diagram for explaining musical tone signal data according to the second embodiment of the present invention.

Explanation of symbols

10 Electronic musical instrument 11 CPU
12 ROM
13 RAM
14 Sound system 15 Display 16 Input I / F
17 keyboard 18 operation unit 21 sound source unit 22 audio circuit 23 speaker 24 microphone

Claims (4)

An electronic musical instrument that generates musical tone signal data based on a pressed key,
Input interface means for accepting external audio signal input and outputting as digital audio signal data;
Sampling means for storing audio signal data output from the input interface means as waveform data in a sampling data area of a waveform RAM;
Based on the depressed key, the musical tone generating means for reading out the waveform data stored in the sampling data area of the waveform RAM and generating musical tone signal data based on the waveform data, and
The musical tone generator has a musical sound waveform in which the waveform data has a constant pitch according to a determination result of whether or not the waveform data stored in the sampling area of the waveform RAM is a musical sound waveform having a fixed pitch. If it is generated musical tone signal data of the pitch according to the pressed key, and the waveform data is not a musical sound waveform having a certain pitch, regardless of the pressed key, An electronic musical instrument characterized by generating musical tone signal data based on the pitch of the waveform data itself.   If the musical sound generating means is not a musical sound waveform having a constant pitch, the playback speed is set to the pitch of the depressed key without changing the pitch of the waveform data. 2. The electronic musical instrument according to claim 1, wherein adjusted musical tone signal data is generated. The musical tone generation means is configured to determine a pitch of a key that has been pressed and a pitch that serves as the reference based on a pitch that is a reference in advance associated with the waveform data and a pitch of the key that has been pressed. Is generated as it is as a tone signal, and tone signal data is generated such that the playback speed increases as the pitch of the depressed key increases. The electronic musical instrument according to claim 2.   The sampling means performs an LPF process on at least a part of the waveform data, refers to the waveform data subjected to the LPF process, finds a predetermined number of peak values, and acquires a time interval between adjacent peak values. The electronic musical instrument according to any one of claims 1 to 3, wherein if the variation of each time interval is within a predetermined range, it is determined that the waveform data has a constant pitch.