JP2001022350A - Waveform reproducing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a waveform reproducing device which reproduces waveforms to be matched with the musical timing of the music played by an automatic playing device. SOLUTION: MIDI signals are inputted from a MIDI interface 16 and a CPU 12 detects musical timing, that is repeatedly generated (a leading head of rhythm). Having received a reading start instruction from an operator group 15, the waveform data stored in a phrase data ROM 11 are read and waveforms are reproduced so that the musical timing position in the waveforms represented by timing data stored in the ROM 11 is matched with the musical timing detected by the CPU 12.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a waveform reproducing apparatus for reading stored waveform data and reproducing a waveform.

[0002]

2. Description of the Related Art Conventionally, in a waveform reproducing apparatus, a musical timing such as a beat or a bar of a musical piece is performed while a musical piece (accompaniment or the like) is being performed by an external or internal automatic musical instrument. It has been practiced to operate an operator such as a keyboard to read out waveform data and reproduce a waveform so as to match the above.

[0003]

Here, a part of waveform data having no sense of rhythm (no concept of beats or bars and no tempo) is read out, and beats and bars of music played by the automatic performance device are read out. You may want to play back the waveform so that it matches the beginning of the waveform. For example, if the user wants to read out waveform data in which a cymbal sound is stored next to a drum roll and play back the waveform, an instruction to play back the waveform with an operator gives
The drum roll simply sounds and then a cymbal sound is generated. For this reason, it is difficult to operate so that the drum roll sounds first and the cymbal sound is generated at the beginning of the next bar in the middle of the music being played by the automatic performance device.

[0004] In addition, although there is a sense of rhythm (the concept of beats and measures and the tempo exists), the timing of the beats and measures of the waveform data having a portion called a prebeat from the beginning to the timing of the first beat, the automatic performance There is a case where it is desired to read out the waveform data and reproduce the waveform so that the timing of the beat / bar of the music played by the device matches. However, it is difficult to instruct the start of waveform reproduction so that the timing of the first beat of the waveform data coincides with the timing of the beat of the music played by the automatic performance device at the time when the prebeat reproduction is completed. is there.

The present invention has been made in view of the above circumstances, and has as its object to provide a waveform reproducing apparatus capable of reproducing a waveform so as to match the musical timing of music played by an automatic performance apparatus or the like.

[0006]

According to the present invention, there is provided a waveform reproducing apparatus comprising: (1) storage means for storing waveform data representing a waveform together with timing data indicating a musical timing position in the waveform; 2) read start instructing means for instructing start of reading of the waveform data from the storage means; (3) timing detecting means for detecting repetitive musical timing; and (4) receiving a read start instruction from the read start instructing means. Waveform reproducing means for reading out the waveform data stored in the storage means and reproducing the waveform so that the musical timing position in the waveform represented by the timing data coincides with the musical timing detected by the timing detecting means. Means are provided.

The waveform reproducing apparatus according to the present invention reads out the waveform data stored in the storage means and converts the waveform so that the musical timing position in the waveform coincides with the musical timing detected by the timing detecting means. For example, if you want to read out waveform data in which cymbal sounds are stored next to a drum roll and play back the waveform, the drum roll must first be played in the middle of a song being played by the automatic performance device. By reading the data representing the cymbal sound so as to match the beginning of the next measure, the drum roll sounds first in the middle of the music being played by the automatic performance device, and the next measure A cymbal sound can be produced at the beginning. The pre-beat portion is read out in advance so that the timing of the first beat in the waveform data having the pre-beat coincides with the timing of the beat of the music played by the automatic performance device. Therefore, it is not necessary to perform a difficult operation for matching the timings.

Further, according to the present invention, when a plurality of timing positions are set in a waveform, any one of the plurality of timing positions is set to one of the detected musical timings. What is necessary is just to start waveform reproduction so that they match. Furthermore, in the present invention, the waveform is not limited to the waveform that is reproduced from the beginning. For example, the waveform may be reproduced from the middle of the waveform so that the timing position in the waveform matches the musical timing of the music that has been played in advance. Good.

The waveform reproducing means receives the read start instruction from the read start instructing means, and changes the musical timing position in the waveform represented by the timing data to a time after the timing at which the read start instruction is received. It is determined whether or not the waveform reproduction matched to the musical timing detected first by the timing detecting means is possible, and according to the result of the determination, the musical timing positions in the waveform are respectively set at the beginning. Preferably, the waveform is reproduced so as to match the detected musical timing, or to match the musical timing detected after the first detected musical timing.

With such a waveform reproducing means, regardless of the length of the pre-beat time and the timing of the read start instruction, the waveform is adjusted so that the waveform coincides with the musical timing detected from the musical timing position of any waveform. Will be played. Note that the “musical timing detected later” may be any musical timing as long as it is after the musical timing detected first, but the musical timing detected first is It is desirable to reproduce the waveform using the musical timing detected immediately after the timing.

The timing data indicating the musical timing position in the waveform stored in the storage means is timing data indicating a plurality of discrete musical timing positions in the waveform. Represents a waveform represented by the waveform data stored in the storage means, and a plurality of musical timing positions in the waveform represented by the timing data respectively correspond to a plurality of musical timings sequentially detected by the timing detecting means. It is also a preferred embodiment to include means for compressing or expanding in the time axis direction.

If the waveform reproducing means includes such means for compressing or expanding in the direction of the time axis, the musical timing position in the waveform to be compressed or expanded is used to determine the musical timing of the music played by the automatic performance device. The waveform can be reproduced to match the musical timing.

[0013]

Embodiments of the present invention will be described below.

FIG. 1 is a block diagram of an electronic musical instrument including a waveform reproducing apparatus according to one embodiment of the present invention.

The electronic musical instrument shown in FIG. 1 includes a waveform reproducing apparatus 100 according to the present embodiment, a sequencer 200, a MIDI sound source 300, a mixer 400, an amplifier 500, and a speaker 600.

The sequencer 200 outputs a start message FA and a timing clock F8 to be described later among the MIDI signals to the waveform reproducing apparatus 100. The timing clock F8 continues to be output to the waveform reproducing device 100 even when the performance by the sequencer 200 is stopped.

The MIDI sound source 300 includes a sequencer 200
An audio waveform is output based on the performance information from.

As will be described in detail later, the waveform reproducing apparatus 100 receives the start message FA when reading of waveform data is instructed by a reading start instructing means such as a keyboard.
And the musical timing (here, the beginning of the beat) is detected based on the timing clock F8, and the musical timing position in the waveform represented by the waveform data stored in advance is matched with the detected musical timing. Read the waveform data and play the audio waveform.

The mixer 400 mixes (mixes) the audio waveform output from the MIDI sound source 300 with the audio waveform output from the waveform reproducing device 100.
Output to amplifier 500.

The amplifier 500 amplifies the audio waveform from the mixer 400.

The speaker 600 outputs the audio waveform amplified by the amplifier 500 to a space as sound.

FIG. 2 is a block diagram of the waveform reproducing apparatus shown in FIG.

The waveform reproducing apparatus 100 shown in FIG. 1 has a phrase data ROM 11, a CPU 12, a program R
OM 13, working RAM 14, operator group 15
, MIDI interface 16 and D / A converter 1
7 are provided. These phrase data ROM1
1, CPU 12, program ROM 13, working R
AM 14, operator group 15, MIDI interface 1
6, the D / A converter 17 is mutually connected by a bus 18.

The phrase data ROM 11 stores waveform data representing a waveform together with timing data indicating a musical timing position in the waveform.

The program ROM 13 stores a program for controlling the entire waveform reproducing apparatus 100.

The working RAM 14 is provided with a work area for the CPU 12 to execute various processes.

The operator group 15 includes a phrase data ROM
A read start instructing means according to the present invention for instructing the start of reading of waveform data from the memory 11 is provided.

The MIDI interface 16 receives a start message FA and a timing clock F 8 from the sequencer 200 shown in FIG. 1 and transmits them to the CPU 12 via the bus 18.

The CPU 12 reads out and executes the program stored in the program ROM 13, thereby
The entire waveform reproducing apparatus 100 shown in FIG. 1 is controlled. The CPU 12 plays a role of a timing detecting means according to the present invention.
Timing clock F via I interface 16
It has the function of a beat counter that counts beats by inputting 8, and this beat counter detects the repetitive musical timing (head of beat). The CPU 12 also plays a role of a waveform reproducing means according to the present invention, and receives a read start instruction from the read start instruction means, and receives a musical timing in a waveform represented by the timing data stored in the phrase data ROM 11. A D / A converter 17 that reads the waveform data stored in the phrase data ROM 11 and reproduces a digital waveform so that the position matches the musical timing detected by the CPU 12.
Converts the digital waveform reproduced by the CPU 12 into D / A
The signal is converted and output as an analog audio waveform to the amplifier 500 shown in FIG.

FIG. 3 is a diagram showing the structure of the waveform data stored in the phrase data ROM.

In the waveform data 30 shown in FIG. 3A, a first mark position 31_1 representing the beginning of a beat is provided at the leading end of the waveform data 30, and the second mark positions 31_2,. , Final mark position 31_n. The first mark position 31_1, the second mark position 31_2,..., The final mark position 31_n correspond to the musical timing position according to the present invention. At the rear end of the waveform data 30, a waveform data end position 32 indicating the end of the waveform data 30 is also provided.

On the other hand, in the waveform data 40 shown in FIG. 3B, a prebeat 43 is provided at the beginning, and from the time when the prebeat 43 ends, the waveform data 30 shown in FIG. And the first representing the beginning of the beat
A mark position 41_1, second mark positions 41_2, ..., a final mark position 41_n, and a waveform data end position 42 indicating the end of the waveform data 40 are provided. The waveform reproducing apparatus 100 of the present embodiment handles the waveform data 30 and 40 having such a structure. The details will be described below.

FIG. 4 is a diagram showing how the waveform represented by the waveform data shown in FIG. 3A is reproduced.

The beat information shown in FIG. 4 includes a plurality of beats. These plural beats correspond to the start message F
It is detected by counting one by one every time 24 timing clocks F8 are input to the beat counter realized by the CPU 12 from the time when A is input.

The time t0 shown in FIG. 4 is a time corresponding to the number (24) of the timing clock F8 for one beat. Further, the time t1 is the timing clock F from the beginning of the beat until the reading start instruction is given by the reading start instructing means.
This is the time corresponding to the number 8. The time t2 is a time corresponding to the number of the timing clocks F8 from when the reading start is instructed to when the reading of the waveform data 30 is started.

Here, after a lapse of time t1 from the beginning of the first beat in the beat information shown in FIG. 4, reading start instructing means instructs to start reading the waveform data 30 stored in the phrase data ROM 11. Then, after a lapse of time t2, the first mark position 31_ representing the head of the waveform data 30
The waveform data 30 is read out and the waveform (syllable A) is reproduced so that 1 coincides with the beginning of the second beat of the beat information.

Next, how to reproduce the waveform represented by the waveform data provided with the pre-beat shown in FIG. 3B will be described with reference to FIGS.

FIG. 5 is a diagram showing how a waveform represented by waveform data provided with a prebeat having a first time is reproduced.

The first time t3 shown in FIG.
(Time corresponding to the number (24) of timing clocks F8 for one beat) to time t1 (timing clock F8 from the beginning of the first beat of the beat information to the start of reading).
Less than the time obtained by subtracting the time corresponding to the number 8 (t3 ≦)
This is a relatively short time from t0 to t1).

Here, after a lapse of time t1 from the beginning of the first beat of the beat information, the start of reading the waveform data 40 is instructed. Then, in response to the read start instruction, the CPU 12 detects the end point of the prebeat 43 (the first mark position 41_1 representing the beginning of the beat) after the read start instruction is received, and first. It is determined whether or not syllable A can be reproduced at the beginning of the beat (second beat) of the beat information. Here, the time t3 of the prebeat 43 is equal to or less than the time t0-t1, and
It is determined that the prebeat 43 can be reproduced within 0-t1. Therefore, first the time t is set so that the first mark position 41_1 coincides with the beginning of the second beat of the beat information.
After two passes, the prebeat 43 is reproduced, and then syllable A
Is played.

FIG. 6 is a diagram showing how the waveform represented by the waveform data provided with the prebeat having the second time is reproduced.

The second time t3 is a time (t3> t0-t1) exceeding a value obtained by subtracting the time t1 from the time t0.
It is.

After a lapse of time t1 from the beginning of the first beat of the beat information shown in FIG. 6, the start of reading waveform data 40 is instructed. Then, in response to the read start instruction, the time when the pre-beat 43 ends (the first mark position 41_1 indicating the beginning of the beat) is changed to the beat information detected first after the read start instruction is received. It is determined whether or not syllable A can be reproduced at the beginning of the beat (second beat). Here, the time t3 of the prebeat 43 is
Since the time exceeds the time t0-t1, this time t0
The pre-beat 43 cannot be reproduced within -t1,
Therefore, it is determined that syllable A cannot be reproduced at the beginning of the second beat of the beat information. Therefore, the first mark position 4 is added at the beginning of the third beat of the beat information.
First, the prebeat 43 is reproduced after a lapse of time t2 from the beginning of the second beat of the beat information so that 1_1 matches.
Next, syllable A is reproduced.

FIG. 7 is a diagram showing how the waveform represented by the waveform data provided with the prebeat having the third time is reproduced.

The third time is a time obtained by adding two beats to the first time t3 (t3 ≦ t0−t1) shown in FIG.

After a lapse of time t1 from the beginning of the first beat of the beat information shown in FIG. 7, the start of reading of waveform data 40 is instructed. Here, the time of the pre-beat 43 is a time obtained by adding a time for two beats to the first time t3 (t3 ≦ t0−t1), so that the first beat is added to the beginning of the fourth beat of the beat information.
First, the prebeat 43 is reproduced over the second and third beats after the elapse of the time t2 in the first beat of the beat information so that the mark position 41_1 coincides, and then the syllable A is reproduced.

FIG. 8 shows the reproduction of the waveform represented by the waveform data provided with the prebeat having the second time.
FIG. 7 is a diagram illustrating a state of waveform reproduction different from the waveform reproduction illustrated in FIG. 6.

The time of prebeat 43 shown in FIG. 8 is from time t0 for one beat to time t1 from when reading start is instructed.
(The same time as the pre-beat 43 shown in FIG. 6 described above). In FIG. 6, since the time of the pre-beat 43 exceeds the time t0-t1, it is determined that the waveform reproduction in synchronization with the beginning of the second beat of the beat information is impossible, and the third time of the beat information is determined. So that the first mark position 41_1 coincides with the beginning of the beat
Although syllable A is reproduced, syllable A is reproduced so that the first mark position 41_1 coincides with the beginning of the second beat of the beat information as described below.

In the state where the reading start instruction is not issued, the waveform data is read every time the elapsed time in each beat coincides with the time of one beat t0-the time of prebeat 43. The waveform representing the output data is volume level 0
Is output. That is, the waveform data is in a state of being read but not being sounded. In such a state, if the reading start instruction is not given by the next beat, the reading is stopped when the next beat is shifted, and the elapsed time in the next beat is set to the time of time t0-prebeat 43. If they match, reading of waveform data from the beginning is repeated again.

Here, when a reading start instruction is given by the next beat, a predetermined envelope is added to the read waveform data to generate a sound, and the waveform data is sequentially read out until a reading stop instruction is given. It is. In this way,
Even if the time of the pre-beat 43 exceeds the time t0-t1, the reproduction of the pre-beat 43 is completed from the middle of the time t1 to the end of the first beat of the beat information as shown in FIG. That is, the pre-beat 43 is reproduced first so that the first mark position 41_1 coincides with the head of the second beat of the beat information, and then the syllable A is reproduced.

FIG. 9 is a flowchart of a main routine of the waveform reproducing apparatus shown in FIG.

When the power is turned on to the waveform reproducing apparatus 100 shown in FIG. 2, this main routine is executed. Here, the waveform reproduction represented by the waveform data provided with the prebeat will be described. First, in step S11, initial settings such as setting of a read address of waveform data and resetting of a beat counter are performed, and the process proceeds to step S12. In step S12, a time t3 representing the length of the prebeat and corresponding to the number of timing clocks F8 input to the beat counter is calculated. The time t3 is calculated as follows.

Actual time of timing clock F8 = 60
(Sec) / TEMPO (bps) / 24 (sec). Also.

It is assumed that the actual time of the prebeat = the number of samples of the prebeat × (1 / sample rate) (sec).

Further, assuming that the number of timing clocks F8 for the prebeat is t3 ', t3' = real time of prebeat / timing clock F8
In real time.

Here, 1) when t3 ′ <24, T3 = t3 ′ 2) When t3 ′ = 0 or t3 ′ = 24, T3 = 0 3) When t3 ′> 24, T3 = t3 ′ / The remainder is 24. T3 (the number of timing clocks F8) is converted into time to calculate time t3.

Next, in step S13, the value CNT of the beat counter is set to "0" (reset). Further, in step S14, a sound generation start instruction flag VOICE
To the off state. This sound generation start instruction flag VOICE
Is a flag indicating that when sound generation is started after a waveform data read start instruction is issued, if the pre-beat time of the waveform data is relatively short, the pre-beat sound generation is started from the beat for which the read start instruction was issued. . Next, the process proceeds to step S15. In step S15, the sound generation start instruction flag VOICE2 is turned off. When the sound generation is started after an instruction to start reading the waveform data is made, if the pre-beat time of the waveform data is relatively long, the sound generation start instruction flag VOICE2 indicates a pre-beat from the beat after the beat at which the read start instruction was issued. This is a flag indicating that pronunciation is to be started. Thereafter, this routine ends.

FIG. 10 is a flowchart of a routine for synchronizing the timing clock F8 with the beginning of a beat.

This routine is executed following the main routine shown in FIG. First, step S
At 21, it is determined whether a start message FA of the MIDI signal has been received. If it is determined that the start message FA has been received, the process proceeds to step S22, where the value CNT of the beat counter is set to “0”, and
This routine ends. On the other hand, start message F
If it is determined that A has not been received, this routine ends.

FIG. 11 is a flowchart of a sound generation instruction routine.

This routine is executed when the waveform data is read by the reading start instructing means.

First, in step S31, it is determined whether or not a sound generation instruction has been issued (whether or not there is an event). If it is determined that the pronunciation instruction has not been issued, this routine is terminated without doing anything. On the other hand, if it is determined that the pronunciation instruction has been issued, the process proceeds to step S32.
Proceed to. In step S32, t2 = t0−t3- (C
NT). That is, a time t3 corresponding to the number of the timing clocks F8 for the prebeat and a time (CNT) corresponding to the value of the beat counter are subtracted from the time t0 corresponding to the number of the timing clocks F8 for one beat,
Waiting time t2 corresponding to the number of timing clocks F8 from when the read instruction is issued to when the reproduction of the prebeat is started
Ask for.

Next, in step S33, it is determined whether or not the waiting time t2 is less than 0. If it is determined that the waiting time t2 is not less than 0, that is, it is 0 or more, the process proceeds to step S34 because the prebeat can be reproduced within the beat. In step S34, the sound generation start instruction flag VOICE is turned on, and this routine ends. On the other hand, if it is determined that the waiting time t2 is less than 0, the pre-beat cannot be reproduced within the beat, and the process proceeds to step S35. In step S35, t2
= T0-t3. That is, the waiting time t2 is obtained by subtracting the time t3 corresponding to the number of timing clocks F8 for the prebeat from the time t0 corresponding to the number of timing clocks F8 for one beat. Next, step S3
6, a sounding start instruction flag VOICE indicating that sounding is to be performed at a beat after the beat for which the reading start instruction is issued.
2 is turned on, and this routine ends.

FIG. 12 is a flowchart of an interrupt processing routine generated by the timing clock F8.

This routine corresponds to the timing clock F8
This is a routine started by an interrupt generated every time is input.

First, in step S41, the value CNT of the beat counter is set to the maximum number (in this embodiment, the maximum number is 24 since the explanation is made in units of beats. Is the maximum number). If it is determined that the value CNT of the beat counter is not the maximum number, the process proceeds to step S45 described later. On the other hand, when it is determined that the value CNT of the beat counter is the maximum number, the process proceeds to step S42, and the value CNT of the beat counter is set to “0”. Next, in step S43, it is determined whether or not the sound generation start instruction flag VOICE2 is on. If it is determined that the sounding start instruction flag VOICE2 is not on, the process proceeds to step S45. On the other hand, when it is determined that the sound generation start instruction flag VOICE2 is in the ON state, the process proceeds to step S44. In step S44, the sound generation start instruction flag VOICE is turned on, and the process proceeds to step S45.

In step S45, it is determined whether or not the tone generation start instruction flag VOICE is on. If it is determined that the sounding start instruction flag VOICE is not in the ON state, it is not necessary to sound, and the process proceeds to step S50. On the other hand, if it is determined that the sound generation start instruction flag VOICE is not in the ON state, the process proceeds to step S46.

In step S46, it is determined whether or not the time (CNT) corresponding to the value of the beat counter matches the waiting time t2, that is, whether or not sound generation can be started. If it is determined that the time (CNT) corresponding to the value of the beat counter does not match the waiting time t2, the process proceeds to step S50. On the other hand, if it is determined that the time (CNT) corresponding to the value of the beat counter has coincided with the waiting time t2, the process proceeds to step S47 to start sound generation. Next, in step S48, the sound generation start instruction flag VOICE is turned off,
Further, in step S49, the sound generation start instruction flag V
OICE2 is also turned off, and the process proceeds to step S50.
In step S50, the value CNT of the beat counter is incremented, and this routine ends.

Next, a description will be given of a waveform reproducing apparatus different from the above-described waveform reproducing apparatus 100 according to an embodiment of the present invention.

This waveform reproducing apparatus is different from the above-described waveform reproducing apparatus 100 in that the timing data indicating the musical timing position in the waveform stored in the phrase data ROM 11 includes a plurality of discrete musical The CPU 12 (waveform reproducing means) is a timing data indicating a timing position. The CPU 12 (waveform reproducing means) sets a waveform represented by the waveform data stored in the phrase data ROM 11 to a plurality of musical timing positions in the waveform represented by the timing data.
It includes means for compressing or expanding in the time axis direction so as to coincide with each of a plurality of musical timings sequentially detected by the PU 12 (timing detecting means).
The details will be described below.

A sequencer connected to this waveform reproducing apparatus has a tempo setting operator for setting a reproducing speed,
A start operator and a stop operator for starting and stopping the performance are provided. When the start operator is operated, performance information (MIDI information) is transmitted to the MIDI sound source at a tempo set by the tempo setting operator. Output. Further, the sequencer keeps outputting the tempo information to the waveform reproducing apparatus of the present embodiment even when the performance is stopped.

Further, the waveform reproducing apparatus of the present embodiment is provided with a plurality of waveform data, so that a waveform to be reproduced can be selected by a waveform selecting operator. In each waveform data, tempo information at the time of recording and mark positions (first mark position, second mark position, ...) indicating musical timing on the time axis (head of beat, start of bar) are set. Have been. Here, the interval from the beginning of the waveform data to the first mark position is defined as a prebeat. This prebeat is issued in response to a read start instruction from the read start instruction means (keyboard).
This is a portion that is reproduced prior to the performance from the first mark (head of beat, head of bar).

Here, in order to simplify the description, a non-real-time time stretching process will be described.
When the power is turned on or when the tempo setting operator is operated when the sequencer is not operating, the tempo information sent from the sequencer and the tempo information set in the waveform data selected by the waveform selection operator , The selected waveform data is subjected to time stretching processing to generate waveform data having a temporal length corresponding to the tempo of the sequencer. The time stretching process is a process of compressing or expanding the time axis without changing the pitch by thinning out or interpolating the audio signal. There are various methods for such time stretching processing, and these methods are well-known, and a detailed description thereof will be omitted.

When the reproduction of the waveform is instructed, the pre-beat length time t3 (the length time from the beginning of the waveform data after the time stretch processing to the first mark position) according to the tempo value is calculated, and 1). If the prebeat length time t3 ≦ the beat length time t0−the elapsed time t1 within the beat, the waiting time t2 = t0
− (T1 + t3) is calculated, and after waiting for the waiting time t2, the time-stretched prebeat is reproduced,
The time-stretched waveform is reproduced so that the reproduction timing of the first mark position matches the timing of the next beat.

2) When the pre-beat length time t3> the beat length time t0-the elapsed time t1 within the beat, the waiting time t2 = t0- (t1 + t3) is calculated, and the waiting time t2
Then, the time-stretched prebeat is reproduced, and the time-stretched waveform is reproduced so that the reproduction timing of the first mark position coincides with the timing of the next next beat.

By performing such processing, even when the tempo value is changed by the tempo setting operator when the sequencer is not operating, the reproduction of the first mark position of the waveform data without changing the pitch in synchronization therewith. The waveform can be reproduced so that the timing coincides with the beat (measure) timing.

If the real-time time stretching process is performed, even if the tempo setting operator is operated while the sequencer is operating, the waveform can be reproduced in accordance with the tempo. . Specifically, a tempo value is calculated and calculated in real time from the interval width of the tempo clock sent from the sequencer, and the tempo information of the calculated sequencer and a read start instruction given by the read start instruction means (keyboard). What is necessary is to perform time stretching processing on the waveform data based on the tempo information of the waveform and reproduce the waveform data. By performing such a real-time time stretching process, it is possible to follow the reproduction of the waveform even when the sequencer is operating.

In the waveform reproducing apparatus of the present embodiment, beats and bars, which are musical timings, are detected by counting the MIDI clock (timing clock F8) received from the sequencer. When a device or an automatic accompaniment device is incorporated, a beat and a bar can be detected based on the timing at which the waveform reproducing device itself is generated.

[0079]

As described above, according to the present invention,
The waveform can be reproduced so as to match the musical timing of the music played by the automatic performance device or the like.

[Brief description of the drawings]

FIG. 1 is a block diagram of an electronic musical instrument including a waveform reproducing device according to an embodiment of the present invention.

FIG. 2 is a configuration diagram of the waveform reproducing apparatus shown in FIG.

FIG. 3 is a diagram showing a structure of waveform data stored in a phrase data ROM shown in FIG.

FIG. 4 is a diagram showing how a waveform represented by the waveform data shown in FIG. 3A is reproduced.

FIG. 5 is a diagram showing a state in which a waveform represented by waveform data provided with a prebeat having a first time is reproduced.

FIG. 6 is a diagram showing how a waveform represented by waveform data provided with a prebeat having a second time is reproduced.

FIG. 7 is a diagram showing how a waveform represented by waveform data provided with a prebeat having a third time is reproduced.

FIG. 8 is a diagram showing a state of waveform reproduction different from the waveform reproduction shown in FIG. 6 in reproducing a waveform represented by waveform data provided with a prebeat having a second time.

9 is a flowchart of a main routine of the waveform reproduction device shown in FIG.

FIG. 10 is a flowchart of a routine for synchronizing a timing clock F8 with the beginning of a beat.

FIG. 11 is a flowchart of a sound generation instruction routine.

FIG. 12 is a flowchart of an interrupt processing routine generated by a timing clock F8.

[Explanation of symbols]

 11 Phrase Data ROM 12 CPU 13 Program ROM 14 Working RAM 15 Operator Group 16 MIDI Interface 17 D / A Converter 18 Bus 30, 40 Waveform Data 31_1, 41_1 First Mark Position 31_2, 41_2 Second Mark Position 31_n, 41_n Final mark position 32, 42 Waveform data end position 43 Prebeat 100 Waveform reproducing device 200 Sequencer 300 MIDI sound source 400 Mixer 500 Amplifier 600 Speaker

Claims (3)

[Claims] 1. A storage unit for storing waveform data representing a waveform together with timing data indicating a musical timing position in the waveform, and a read start instruction unit for instructing a start of reading the waveform data from the storage unit. A timing detecting means for detecting a repetitive musical timing; and a musical start position in a waveform represented by the timing data is detected by the timing detecting means in response to a read start instruction from the read start instruction means. A waveform reproducing apparatus comprising: waveform reproducing means for reading out waveform data stored in the storage means and reproducing a waveform so as to match musical timing. 2. The waveform reproducing means receives a read start instruction from the read start instruction means, and changes a musical timing position in a waveform represented by the timing data to a time after the timing at which the read start instruction is received. It is determined whether or not the waveform reproduction that matches the musical timing detected first by the timing detection means is possible, and according to the determination result,
The musical timing positions in the waveform match the first detected musical timing, respectively, or coincide with the musical timing detected after the first detected musical timing. 2. The waveform reproducing apparatus according to claim 1, wherein the apparatus reproduces a waveform. 3. The waveform reproducing means, wherein the timing data indicating the musical timing position in the waveform stored in the storage means is timing data indicating a plurality of discrete musical timing positions in the waveform. Is a waveform represented by the waveform data stored in the storage means, each of a plurality of musical timing positions in the waveform represented by the timing data coincides with each of a plurality of musical timings sequentially detected by the timing detection means 3. The waveform reproducing apparatus according to claim 1, further comprising means for compressing or expanding in the time axis direction.