JP4170524B2 - Waveform playback device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a waveform reproducing device that reads out stored waveform data and reproduces a waveform.
[0002]
[Prior art]
Conventionally, in a waveform playback device, a musical piece is played (accompaniment, etc.) by an automatic performance device provided externally or internally, so that it matches the musical timing of the musical piece, such as a beat or measure. An operation element such as a keyboard is operated to read waveform data and reproduce the waveform.
[0003]
[Problems to be solved by the invention]
Here, a part of the waveform data that has no sense of rhythm (no concept of beat or measure and does not have a tempo) is read, and the waveform is matched with the beginning of the beat or measure of the music played on the automatic performance device. You may want to play it. For example, when it is desired to read the waveform data in which the cymbal sound is stored next to the drum roll and reproduce the waveform, when the waveform reproduction is instructed by the operator, the drum roll is simply sounded and then the cymbal sound is generated. For this reason, it is difficult to perform an operation so that a drum roll is first sounded and a cymbal sound is generated at the beginning of the next measure in the middle of a musical piece being played by an automatic performance device.
[0004]
In addition, there is a sense of rhythm (there is a concept of beats and measures and has a tempo), but the timing of the beat and measure of the waveform data that has a part called pre-beat from the beginning to the timing of the first beat and the performance on the automatic performance device There are cases where it is desired to read out the waveform data and reproduce the waveform so that the beat / measure timing of the music to be played matches. However, it is difficult to instruct the start of waveform playback so that the timing of the first beat of the waveform data coincides with the timing of the beat of the music played on the automatic performance device when the prebeat playback is completed. is there.
[0005]
In view of the above circumstances, an object of the present invention is to provide a waveform reproducing device capable of reproducing a waveform so as to coincide with the musical timing of music played by an automatic performance device or the like.
[0006]
[Means for Solving the Problems]
The waveform reproducing apparatus of the present invention that achieves the above-described object provides:
(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 instruction means for instructing start of reading of the waveform data from the storage means
(3) Timing detection means for detecting repetitive musical timing
(4) In response to a read start instruction from the read start instruction means, the storage means so that the musical timing position in the waveform represented by the timing data coincides with the musical timing detected by the timing detection means. Waveform reproducing means for reading out waveform data stored in the memory and reproducing the waveform
It is provided with.
[0007]
The waveform reproducing apparatus of the present invention reads out the waveform data stored in the storage means and reproduces the waveform so that the musical timing position in the waveform matches the musical timing detected by the timing detecting means. Therefore, for example, when it is desired to read the waveform data in which the cymbal sound is stored next to the drum roll and reproduce the waveform, the data representing the drum roll is first displayed in the middle of the musical piece being played by the automatic performance device. By reading the data representing the cymbal sound so that it coincides with the beginning of the next measure, the drum roll sounds first in the middle of the music played on the automatic performance device, and the cymbal appears at the beginning of the next measure. Sounds can be pronounced. In addition, when the prebeat part is read out in advance so that the timing of the first beat in the waveform data having the prebeat matches the timing of the beat of the music played on the automatic performance device, Therefore, it is not necessary to perform a difficult operation for making the timings coincide with each other.
[0008]
Further, according to the present invention, when a plurality of timing positions are set in the waveform, any one of the plurality of timing positions coincides with one of the detected musical timings. As long as the waveform reproduction is started, it is sufficient. Furthermore, in the present invention, the waveform is not limited to the one 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 being played in advance. Good.
[0009]
Here, the waveform reproduction means receives the read start instruction from the read start instruction means, and detects the timing of the musical timing in the waveform represented by the timing data after the timing at which the read start instruction is received. It is determined whether or not the waveform reproduction matched with the musical timing first detected by the means is possible, and the musical timing position in the waveform is detected first according to the determination result. It is preferable that the waveform is reproduced so as to coincide with the musical timing or coincide with the musical timing detected after the first detected musical timing.
[0010]
With such waveform reproduction means, the waveform is reproduced so as to coincide with the musical timing detected from the musical timing position of any waveform, regardless of the length of the prebeat or the timing of the reading start instruction. . The “musical timing detected later” here may be any musical timing as long as it is after the first musical timing, but the first detected musical timing. It is desirable to reproduce the waveform using musical timing detected immediately after the timing.
[0011]
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, and the waveform reproducing means The waveform represented by the waveform data stored in the storage means is such that 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. It is also a preferable aspect that includes means for compressing or extending in the time axis direction.
[0012]
When the waveform reproducing means includes means for compressing or expanding in the time axis direction, the musical timing position in the waveform to be compressed or expanded is the musical timing of the music played by the automatic performance device. The waveform can be reproduced so as to match.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described.
[0014]
FIG. 1 is a block diagram of an electronic musical instrument including a waveform reproducing device according to an embodiment of the present invention.
[0015]
The electronic musical instrument shown in FIG. 1 includes a waveform reproducing device 100 according to this embodiment, a sequencer 200, a MIDI sound source 300, a mixer 400, an amplifier 500, and a speaker 600.
[0016]
The sequencer 200 outputs a later-described start message FA and timing clock F8 among the MIDI signals to the waveform reproduction device 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.
[0017]
The MIDI sound source 300 outputs an audio waveform based on performance information from the sequencer 200.
[0018]
As will be described in detail later, the waveform reproducing device 100, when instructed to start reading out waveform data by a reading start instructing means such as a keyboard, performs musical timing (in this case, beats based on the start message FA and the timing clock F8). The waveform data is read and the audio waveform is reproduced so that the musical timing position in the waveform represented by the waveform data stored in advance matches the detected musical timing.
[0019]
The mixer 400 mixes (mixes) the audio waveform output from the MIDI sound source 300 and the audio waveform output from the waveform reproduction apparatus 100 and outputs the mixed result to the amplifier 500.
[0020]
The amplifier 500 amplifies the audio waveform from the mixer 400.
[0021]
The speaker 600 outputs the audio waveform amplified by the amplifier 500 as sound in the space.
[0022]
FIG. 2 is a block diagram of the waveform reproducing apparatus shown in FIG.
[0023]
The waveform reproduction apparatus 100 shown in FIG. 1 includes a phrase data ROM 11, a CPU 12, a program ROM 13, a working RAM 14, a control group 15, a MIDI interface 16, and a D / A converter 17. ing. The phrase data ROM 11, CPU 12, program ROM 13, working RAM 14, operator group 15, MIDI interface 16, and D / A converter 17 are mutually connected by a bus 18.
[0024]
The phrase data ROM 11 stores waveform data representing a waveform together with timing data indicating a musical timing position in the waveform.
[0025]
The program ROM 13 stores a program for controlling the entire waveform reproducing device 100.
[0026]
The working RAM 14 includes a work area for the CPU 12 to execute various processes.
[0027]
The operating element group 15 is provided with reading start instruction means according to the present invention for instructing the start of reading waveform data from the phrase data ROM 11.
[0028]
The MIDI interface 16 receives a start message FA and a timing clock F8 from the sequencer 200 shown in FIG. 1 and transmits them to the CPU 12 via the bus 18.
[0029]
The CPU 12 controls the entire waveform reproducing device 100 shown in FIG. 1 by reading and executing the program stored in the program ROM 13. The CPU 12 plays the role of the timing detection means according to the present invention. Specifically, the CPU 12 has a function of a beat counter that inputs a timing clock F8 via the MIDI interface 16 and counts beats. The musical timing (beginning of beats) that occurs repeatedly is detected by this beat counter. Further, the CPU 12 plays a role of the waveform reproducing means according to the present invention. Upon receiving a reading start instruction from the reading start instructing means, the musical timing in the waveform represented by the timing data stored in the phrase data ROM 11 is obtained. The waveform data stored in the phrase data ROM 11 is read and the digital waveform is reproduced so that the position matches the musical timing detected by the CPU 12.
The D / A converter 17 D / A converts the digital waveform reproduced by the CPU 12 and outputs it as an analog audio waveform to the amplifier 500 shown in FIG.
[0030]
FIG. 3 is a diagram showing the structure of waveform data stored in the phrase data ROM.
[0031]
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 tip of the waveform data 30, and the second mark positions 31_2,. A position 31_n is provided. These first mark position 31_1, second mark position 31_2,..., And final mark position 31_n correspond to the musical timing position in the present invention. A waveform data end position 32 indicating the end of the waveform data 30 is also provided at the rear end of the waveform data 30.
[0032]
On the other hand, in the waveform data 40 shown in FIG. 3B, a prebeat 43 is provided at the head portion, and from the time when the prebeat 43 is completed, the waveform data 40 is sequentially sequentially similar to the waveform data 30 shown in FIG. , A first mark position 41_1 representing the beginning of the beat, a second mark position 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. In the waveform reproducing apparatus 100 of this embodiment, the waveform data 30 and 40 having such a structure are handled. Details will be described below.
[0033]
FIG. 4 is a diagram showing how the waveform represented by the waveform data shown in FIG.
[0034]
A plurality of beats are engraved in the beat information shown in FIG. The plurality of beats are detected by counting each time 24 timing clocks F8 are input to the beat counter realized by the CPU 12 from the time when the start message FA is input.
[0035]
4 is a time corresponding to the number (24) of timing clocks F8 for one beat. Further, the time t1 is a time corresponding to the number of timing clocks F8 from the beginning of the beat until the reading start instruction is instructed by the reading start instruction means. The time t2 is a time corresponding to the number of timing clocks F8 from the start of reading to the start of reading of the waveform data 30.
[0036]
Here, after the elapse of time t1 from the beginning of the first beat in the beat information shown in FIG. 4, the readout start instructing unit instructs to start reading out the waveform data 30 stored in the phrase data ROM 11. Then, after time t2, the waveform data 30 is read and the waveform (syllable A) so that the first mark position 31_1 representing the beginning of the waveform data 30 coincides with the beginning of the second beat of the beat information. Is played.
[0037]
Next, the manner in which the waveform represented by the waveform data provided with the prebeat shown in FIG. 3B is reproduced will be described with reference to FIGS.
[0038]
FIG. 5 is a diagram illustrating a state in which the waveform represented by the waveform data provided with the prebeat having the first time is reproduced.
[0039]
The first time t3 shown in FIG. 5 is instructed to start reading from time t0 (time corresponding to the number of timing clocks F8 for one beat (24)) to time t1 (start of the first beat of beat information). This is a relatively short time that is equal to or less than the time obtained by subtracting the time corresponding to the number of timing clocks F8 until (t3 ≦ t0−t1).
[0040]
Here, after the time t1 has elapsed from the beginning of the first beat of the beat information, an instruction to start reading the waveform data 40 is given. Then, the CPU 12 receives the reading start instruction and detects the time when the pre-beat 43 ends (first mark position 41_1 representing the beginning of the beat) after the timing at which the reading start instruction is received, and is detected first. It is determined whether or not the syllable A can be reproduced at the beginning of the beat of the beat information (second beat). Here, since the time t3 of the prebeat 43 is equal to or less than the time t0-t1, it is determined that the prebeat 43 can be reproduced within the time t0-t1. Accordingly, the prebeat 43 is first reproduced after the elapse of time t2, and then the syllable A is reproduced so that the first mark position 41_1 coincides with the beginning of the second beat of the beat information.
[0041]
FIG. 6 is a diagram illustrating a state in which the waveform represented by the waveform data provided with the prebeat having the second time is reproduced.
[0042]
The second time t3 is a time exceeding the value obtained by subtracting the time t1 from the time t0 (t3> t0-t1).
[0043]
When the time t1 has elapsed from the beginning of the first beat of the beat information shown in FIG. Then, in response to the reading start instruction, the time when the pre-beat 43 ends (first mark position 41_1 representing the beginning of the beat) is the first detected beat information after the timing at which the reading start instruction is received. It is determined whether or not the syllable A can be reproduced at the beginning of the second beat (second beat). Here, since the time t3 of the pre-beat 43 is a time exceeding the time t0-t1, the pre-beat 43 cannot be reproduced within this time t0-t1, and therefore, the pre-beat 43 is aligned with the beginning of the second beat of the beat information. Thus, it is determined that the syllable A cannot be reproduced. Therefore, the pre-beat 43 is first reproduced after the elapse of time t2 from the beginning of the second beat of beat information, and then the syllable A is reproduced so that the first mark position 41_1 coincides with the beginning of the third beat of the beat information. The
[0044]
FIG. 7 is a diagram illustrating a state in which the waveform represented by the waveform data provided with the prebeat having the third time is reproduced.
[0045]
The third time is a time obtained by adding two beats to the first time t3 (t3 ≦ t0−t1) shown in FIG.
[0046]
After time t1 has elapsed from the beginning of the first beat of the beat information shown in FIG. Here, since the time of the pre-beat 43 is a time obtained by adding the time of two beats to the first time t3 (t3 ≦ t0−t1), the first mark position is at the head of the fourth beat of the beat information. First, the prebeat 43 is reproduced over the second and third beats after the elapse of time t2 in the first beat of the beat information so that 41_1 matches, and then the syllable A is reproduced.
[0047]
FIG. 8 is a diagram showing a state of waveform reproduction different from the waveform reproduction shown in FIG. 6 when reproducing the waveform represented by the waveform data provided with the prebeat having the second time.
[0048]
The time of the prebeat 43 shown in FIG. 8 is a time exceeding the value obtained by subtracting the time t1 from the time t0 for one beat to the start of reading (the same time as the time of the prebeat 43 shown in FIG. 6). is there. In FIG. 6, since the time of the pre-beat 43 is a time exceeding the time t0-t1, it is determined that waveform reproduction matching the beginning of the second beat of the beat information is impossible, and the third beat information The syllable A is reproduced so that the first mark position 41_1 coincides with the beginning of the beat, but here, as described below, the first mark position 41_1 coincides with the beginning of the second beat of the beat information. Play syllable A as you do.
[0049]
When no reading start instruction is given, the waveform data is read and read every time the elapsed time in each beat matches the time t0-prebeat 43 for one beat. A waveform representing data is output at a volume level 0. That is, the waveform data is being read but not sounded. In such a state, if the readout start instruction is not given by the next beat, the readout is stopped when the next beat is reached, and the elapsed time in the next beat is the time t0-prebeat 43 time. If they match, the waveform data is read again from the beginning.
[0050]
Here, when a readout start instruction is given by the next beat, a predetermined envelope is added to the waveform data being read out to generate a sound, and the waveform data is sequentially read out until a readout stop instruction is issued. Thus, even if the time of the prebeat 43 exceeds the time t0-t1, the prebeat 43 is reproduced from the middle of the time t1 in accordance with the end of the first beat of the beat information as shown in FIG. First, the pre-beat 43 is reproduced, and then the syllable A is reproduced so that the first mark position 41_1 coincides with the beginning of the second beat of the beat information.
[0051]
FIG. 9 is a flowchart of the main routine of the waveform reproducing apparatus shown in FIG.
[0052]
When the waveform reproducing apparatus 100 shown in FIG. 2 is turned on, this main routine is executed. Here, waveform reproduction represented by waveform data provided with a prebeat will be described. First, in step S11, initial setting such as setting of the readout address of the waveform data and resetting of the beat counter is performed, and the process proceeds to step S12. In step S12, a time t3 corresponding to the number of timing clocks F8 input to the beat counter, which represents the length of the prebeat, is calculated. The time t3 is calculated as follows.
[0053]
Real time of timing clock F8
= 60 (sec) / TEMPO (bps) / 24 (sec)
And Also.
[0054]
Pre-beat real time
= Number of prebeat samples x (1 / sample rate) (sec)
And
[0055]
Furthermore, if the number of timing clocks F8 for the prebeat is t3 ′,
t3 '= real time of prebeat / real time of timing clock F8
It becomes.
[0056]
Where 1) if t3 ′ <24, then T3 = t3 ′
2) When t3 ′ = 0 or t3 ′ = 24, T3 = 0
3) When t3 ′> 24, the remainder of T3 = t3 ′ / 24
It becomes. Time T3 is calculated by converting T3 (the number of timing clocks F8) into time.
[0057]
Next, in step S13, the value CNT of the beat counter is set to “0” (reset). In step S14, the sound generation start instruction flag VOICE is turned off. This sounding start instruction flag VOICE starts prebeat sounding from the beat at which the read start instruction is issued when the prebeat time of the waveform data is relatively short before starting to sound after the waveform data read start instruction is issued. It is a flag indicating that. Next, the process proceeds to step S15. In step S15, the sound generation start instruction flag VOICE2 is turned off. The sound generation start instruction flag VOICE2 is used to start pre-beat from the beat after the read instruction when the waveform data has a relatively long pre-beat time. It is a flag indicating the start of pronunciation. Thereafter, this routine is terminated.
[0058]
FIG. 10 is a flowchart of a routine for synchronizing the timing clock F8 to the head of the beat.
[0059]
This routine is executed subsequent to the main routine shown in FIG. First, in step S21, it is determined whether or not a start message FA of the MIDI signals has been received. If it is determined that the start message FA has been received, the process proceeds to step S22, the value CNT of the beat counter is set to “0”, and this routine is terminated. On the other hand, if it is determined that the start message FA has not been received, this routine is terminated.
[0060]
FIG. 11 is a flowchart of the pronunciation instruction routine.
[0061]
This routine is executed when the waveform data is read by the reading start instruction means.
[0062]
First, in step S31, it is determined whether or not a sound generation instruction has been made (whether 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 a sound generation instruction has been issued, the process proceeds to step S32. In step S32, t2 = t0-t3- (CNT) is calculated. That is, a read instruction is issued by subtracting a time t3 corresponding to the number of pre-beat timing clocks F8 and a time (CNT) corresponding to the value of the beat counter from a time t0 corresponding to the number of timing clocks F8 of one beat. After that, a waiting time t2 corresponding to the number of timing clocks F8 from the start of prebeat reproduction is obtained.
[0063]
Next, in step S33, it is determined whether the waiting time t2 is less than zero. If it is determined that the waiting time t2 is not less than 0, that is, greater than or equal to 0, the process proceeds to step S34 because the pre-beat 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, since the pre-beat cannot be reproduced within the beat, the process proceeds to step S35. In step S35, t2 = t0-t3 is calculated. 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, in step S36, the sound generation start instruction flag VOICE2 indicating that sound generation is performed after the beat for which the reading start instruction is issued is turned on, and this routine is ended.
[0064]
FIG. 12 is a flowchart of an interrupt processing routine generated by the timing clock F8.
[0065]
This routine is started by an interrupt that occurs every time the timing clock F8 is input.
[0066]
First, in step S41, the value CNT of the beat counter is the maximum number (in this embodiment, since the explanation is in units of beats, the maximum number is 24, but in the case of measure units, the number of beats is 24 times the number of beats. It is determined whether or not the maximum number is reached. When 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, if 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 sound generation start instruction flag VOICE2 is not in the on state, the process proceeds to step S45. On the other hand, if it is determined that the sound generation start instruction flag VOICE2 is on, 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.
[0067]
In step S45, it is determined whether the sound generation start instruction flag VOICE is on. If it is determined that the sound generation start instruction flag VOICE is not in the on state, it is not necessary to perform sound generation, 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 on, the process proceeds to step S46.
[0068]
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 coincides 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, and in step S49, the sound generation start instruction flag VOICE2 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 is terminated.
[0069]
Next, a waveform reproduction device different from the waveform reproduction device 100 described above according to an embodiment of the present invention will be described.
[0070]
Compared with the waveform reproduction device 100 described above, this waveform reproduction device stores timing data indicating musical timing positions in the waveform stored in the phrase data ROM 11 as a plurality of discrete musical timing positions in the waveform. The CPU 12 (waveform reproducing means) indicates the waveform represented by the waveform data stored in the phrase data ROM 11, and each of a plurality of musical timing positions in the waveform represents the CPU 12 (timing detection). 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 means). Details will be described below.
[0071]
The sequencer connected to this waveform playback device is equipped with a tempo setting operator for setting the playback speed, and a start operator and a stop operator for starting and stopping the performance. When operated, the performance information (MIDI information) is output to the MIDI sound source at the tempo set by the tempo setting operator. Further, the sequencer continues to output tempo information to the waveform reproduction apparatus of the present embodiment even when the performance is stopped.
[0072]
In addition, the waveform reproduction apparatus of the present embodiment includes a plurality of waveform data, and a waveform to be reproduced can be selected by a waveform selection operator. Each waveform data is set with tempo information at the time of recording and mark positions (first mark position, second mark position,...) Indicating timing on the musical time axis (start of beat, start of measure). Has been. Here, the pre-beat is from the beginning of the waveform data to the first mark position. This pre-beat is a portion that is reproduced prior to the performance from the first mark (start of beat, start of measure) in response to a read start instruction from the read start instruction means (keyboard).
[0073]
Here, in order to simplify the description, a non-real time time stretch 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 In response to this, time stretching processing is performed on the selected waveform data, and waveform data having a time length corresponding to the tempo of the sequencer is generated. The time stretch 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 stretch processing, and since these are known, detailed description thereof is omitted here.
[0074]
When waveform reproduction is instructed, the prebeat length time t3 (the length time from the beginning of the waveform data after the time stretching process to the first mark position) corresponding to the tempo value is calculated,
1) In the case of prebeat length time t3 ≦ beat length time t0−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, and the time stretching is performed so that the reproduction timing of the first mark position matches the timing of the next beat. Allow the processed waveform to be played back.
[0075]
2) If prebeat length time t3> beat length time t0-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 played back so that the playback timing of the first mark position matches the timing of the next next beat. The time stretched waveform is played back.
[0076]
By performing such processing, even if the tempo value is changed by the tempo setting operator when the sequencer is not operating, the reproduction timing of the first mark position of the waveform data is not changed without synchronizing the pitch. The waveform can be reproduced so as to coincide with the (measure) timing.
[0077]
If real-time time stretch processing is performed, waveform reproduction in accordance with the tempo can be performed even when the tempo setting operator is operated while the sequencer is operating. Specifically, the tempo value is calculated in real time from the interval width of the tempo clock sent from the sequencer, and the readout start instruction is issued by the calculated sequencer tempo information and the readout start instruction means (keyboard). The waveform data may be reproduced by applying time stretch processing to the waveform tempo information. If such a real-time time stretching process is performed, waveform reproduction can be followed even when the sequencer is operating.
[0078]
In the waveform reproducing apparatus of the present embodiment, the musical timing, beat and measure, are detected by counting the MIDI clock (timing clock F8) received from the sequencer. When an accompaniment device is incorporated, beats and measures can be detected based on timing generated by the waveform reproduction device itself.
[0079]
【The invention's effect】
As described above, according to the present invention, the waveform can be reproduced so as to coincide with 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 reproduction device according to an embodiment of the present invention.
FIG. 2 is a configuration diagram of the waveform reproducing device shown in FIG. 1;
3 is a diagram showing the structure of waveform data stored in the phrase data ROM shown in FIG. 2. FIG.
FIG. 4 is a diagram illustrating a state in which a waveform represented by the waveform data illustrated in FIG.
FIG. 5 is a diagram illustrating 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 illustrating a state in which 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 the waveform represented by the waveform data provided with the prebeat having the 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 the timing clock F8 to 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 controls
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 End position of waveform data
43 Prebeat
100 Waveform playback device
200 sequencer
300 MIDI sound source
400 mixer
500 amplifier
600 speakers

Claims (2)

Storage means for storing waveform data representing a waveform together with timing data indicating a musical timing position in the waveform;
Reading start instruction means for instructing the start of reading of the waveform data from the storage means;
The timing clock that defines the performance timing of the performance based on the performance information is counted from the time when the start message that defines the performance start of the performance based on the performance information is input, and a predetermined musical timing is detected based on the counted value. Timing detection means for
In response to a read start instruction from the read start instruction means, the musical timing position in the waveform represented by the timing data is stored in the storage means so as to coincide with the musical timing detected by the timing detection means. Waveform reproducing means for reading out the waveform data and reproducing the waveform,
The waveform reproducing means is configured to instruct to start reading out the waveform data from a time A from the beginning of the waveform to the first musical timing position in the waveform and a read start instruction timing of the waveform data by the read start instructing means. For the time B until the musical timing first detected by the timing detection means after the timing, if A ≦ B, the first musical timing position in the waveform and the reading start timing of the waveform data First, the waveform is reproduced from the beginning so that the musical timing detected by the timing detection means coincides. If A> B, the first musical timing position in the waveform and the waveform data Musical timing after the musical timing first detected by the timing detection means after the read start instruction timing. Waveform reproduction apparatus, characterized in that for reproducing the waveform as timing and match from the beginning.   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, and the waveform reproducing means includes the storage means The time axis is such that 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 detecting means. 2. A waveform reproducing apparatus according to claim 1, further comprising means for compressing or expanding in the direction.

Images