JPH0436398B2 - - Google Patents

Description

[Detailed description of the invention]

(Field of the Invention) The present invention relates to a tempo control device for an automatic musical instrument that includes a keyboard and a memory means and executes an automatic performance according to data sequentially read from the memory, and particularly relates to a tempo control device for an automatic musical performance machine that is equipped with a keyboard and a memory means and that executes an automatic performance according to data sequentially read from the memory. The present invention relates to a tempo control device for an automatic performance machine, which corrects the timing of a key and returns the original tempo of a piece of music based on the operation of a tempo return switch or tempo return data read from the memory means. (Background of the Invention) A conventional automatic performance machine is equipped with a keyboard and a memory means, and automatically plays rhythm and accompaniment according to data sequentially read from the memory, and also adjusts the tempo of the automatic performance machine in accordance with the key performance. There is a known device in which it is made to follow (for example, Japanese Patent Application Laid-Open No. 57-5098). By the way, in such an automatic performance machine, if a person who is new to playing plays the keys, the tempo of the automatic performance will be completely off. The problem was that even if you tried to return to the tempo (standard tempo), it would be difficult to return to the original tempo. (Object of the Invention) The present invention has been made in view of the problems in the conventional type described above, and the tempo of the automatic performance, that is, the tempo of the key performance (model tempo) is successively changed to follow the tempo of the actual key performance. An object of the present invention is to provide a tempo control device for an automatic musical instrument that is capable of immediately returning the tempo to a standard tempo that is appropriate for the phrase in progress by applying a return signal. do. (Structure of the Invention) In order to achieve the above object, the present invention detects a discrepancy between the timing of automatic performance, that is, the timing at which a key should be pressed during a key performance, and the actual key pressing timing, and adjusts the tempo according to the amount of this discrepancy. By generating data and modifying the tempo data for tempo clock frequency control, the tempo of the automatic musical instrument follows the tempo of the key performance, and the tempo return signal generator and standard tempo data that follow the progression of the song are generated. A progress tempo register is provided to store the progress.
When a tempo return signal is generated, the tempo data for controlling the tempo clock frequency is immediately replaced with standard tempo data to return the tempo of automatic performance to the standard state. (Explanation of overall configuration of embodiments) Examples of the present invention will be described below with reference to the drawings. FIG. 1 shows the configuration of an automatic musical instrument according to an embodiment of the present invention. The automatic performance machine shown in the figure reads recorded data of a magnetic stripe 1a formed on a musical score 1 with a musical score data reading device 2, and based on this read data, displays the next key to be pressed in order to play a melody note. A rhythm sound automatic play function that automatically plays rhythm sounds, an accompaniment sound automatic play function that automatically plays accompaniment sounds such as chord sounds and bass sounds, and a function that automatically plays accompaniment sounds such as chord sounds and bass sounds. The present invention is applied to an automatic musical instrument equipped with a tempo following function to follow the performance. On the magnetic stripe 1a formed on the musical score 1,
Pitch data for notes to be played on the key such as melody notes, note length data, standard tempo data indicating the appropriate tempo of each phrase in progress as the song progresses, and the tempo changed in accordance with the key playing as the standard tempo. Tempo return data inserted at a desired location, such as immediately before transition from melody to interlude, and note length data indicating the number of beats of each key press in a key performance are recorded. The music score reading device 2 reads the data recorded on the magnetic stripe 1a, sends it to the pitch memory 3 and note length memory 4, and also reads the data recorded on the magnetic stripe 1a.
The address data to which the read data is to be written is generated based on the order of the data recorded in the data or the synchronization signal, strobe signal, address data, etc. recorded together with this data. The read/write control circuits 5 and 6 control data writing and data reading into the memories 3 and 4, respectively, and when writing, the address specified by the address data output from the score reading device 2 (the memory 3 and 4), and write the read data that is output simultaneously with this address data, and when reading, read data from memories 3 and 4, respectively, while incrementing the address every time a step signal (described later) is input. read out. Of the data read from the magnetic stripe 1a by the score reading device 2, pitch data, standard tempo data, and tempo return data are written into the memory 3. Table 1 shows an example of the data arrangement within the memory 3. The first address contains standard tempo (absolute value) data TPA as the initial tempo of the song, followed by pitch data TN1, TN2, etc., and standard tempo (relative value) data for changing the standard tempo during the song. TPR1, TPR2, . . . and tempo return data RD inserted at a desired location, such as immediately before an interlude, are stored. Each of these data has identification marks ID1, ID2, ID2, etc., which use the upper two bits of each data to indicate whether the data type is pitch, tempo, or return data.
... is attached.

【table】

[Table] In the above, relative values representing the sum or difference from the previous standard tempo are used as the second and subsequent standard tempo data, but this does not relatively change the tempo control data that follows the key performance. Of course, absolute values may be used when these are not taken into account, in order to reduce the amount of information. Memory 4 stores note length data as shown in Table 2.
TL1, TL2, ... are stored. These note length data are

[Table] Each note corresponds to the pitch data written in the pitch memory 3, and the i-th note on the musical score is represented by pitch data TNi and note length data TLi. Note that the rest data may be represented by pitch data in which all bits are 0, for example, or the note length of this appended note may be added to the note length data of the immediately preceding note. In this automatic performance machine, as mentioned above, the musical score 1
After reading the data recorded on the magnetic stripe 1a with the music score reading device 2 and writing it into the memories 3 and 4, when the start set switch of the start/stop control circuit (not shown) is turned on, this start/stop control circuit After initially setting the counter, etc., read the data for two notes from memories 3 and 4, and read the pitch data of the first note.
After latching TN1 to the latch circuit 7 and latching the note length data TL1 to the latch circuit 8, the system waits for a key depression on the melody performance keyboard 9. In this state, each register, latch circuit 10, etc. remain cleared by initialization when the power is turned on or by the previous stop operation. In addition, the key press display circuit 11
lights up an indicator lamp (not shown) for the key corresponding to pitch data TN1, and memories 3 and 4 output pitch data (including identification marks) TN2 and note length data TL2, respectively. Further, data read out before the pitch data TN1 and TN2, such as standard tempo (absolute value) data TPA, etc., is sent to a progressive tempo register provided in the tempo signal generation circuit 13 via the tempo/return data detection circuit 12. It is stored in etc. In this state, when a key indicated by the lighting of the display lamp on the keyboard 9 is pressed, the keyboard 9 generates a key code KC representing the pressed key. The musical tone forming circuit 14 forms a musical tone signal corresponding to the melody tone indicated by this key code KC, and sends this to the sound system 15.
In addition to this, it is also pronounced as a melody sound. Further, the key code KC generated by the keyboard 9 is supplied to a depressed key comparison circuit 16. This comparison circuit 1
6 compares this key code KC with the pitch data latched in the latch circuit 7, and when they match, that is, when the displayed key is pressed, a short pulse matching signal EQ is generated. . This match signal EQ is supplied to the latch circuit 8 as a load signal and also to the read/write control circuit 6 as a step signal. Therefore, the code length data TL2 output from the memory 4 is latched in the latch circuit 8, the address counter of the read/write control circuit 6 is incremented, and the memory 4 outputs the next code length data TL3. The coincidence signal EQ is also supplied to one input terminal of the AND circuit 18 and the step signal input terminal of the read/write control circuit 5 via the OR circuit 17. The other input terminal of the AND circuit 18 is connected to the output terminal of a pitch mark detection circuit 19 that detects the identification mark ID2 representing pitch data among the identification marks of each data output from the memory 3 and outputs "1". It is connected. And now memory 3 is pitch data
Since it outputs TN2, the output of this detection circuit 19 is "1". Therefore, when the match signal EQ is generated, the AND circuit 18 outputs the latch circuits 7 and 1.
0, the latch circuit 10 takes in the output data TN1 of the latch circuit 7 at the rising edge of the load signal, that is, the coincidence signal EQ, and latches this data TN1 at the falling edge of the load signal.
Output. The latch circuit 7 also latches the pitch data TN2 output from the memory 3 at the same timing. Further, the address counter in the read/write control circuit 5 is incremented by the match signal EQ inputted as a step signal via the OR circuit 17, and the memory 3 outputs the next data TN3. As described above, pitch data TNi and note length data TLi are sequentially read out from memories 3 and 4 each time a coincidence signal EQ is generated. Note that when data other than pitch data is read from the memory 3, the tempo/return data detection circuit 12 determines the type of data based on the identification mark attached to these data, and reads data other than pitch data. reading data from which identification marks have been removed from the output of memory 3 and any of the tempo absolute value signal ABT, tempo relative value signal RLT, and automatic return signal AR that indicate the type of data.
Output MTP. When any of the above signals is "1", a step signal "1" is applied to the read/write control circuit 5 via the OR circuits 21 and 17, and the address counter further increments to read the next address from the memory 3. Read address data. That is, after a match signal is generated, the address counter of the control circuit 5 repeats increments until the next pitch data is read out. During this time, the standard tempo and return data of each address are read out and these data are used as the tempo and return data. It is supplied to the tempo signal generation circuit 13 via the data detection circuit 12, and stops when the next pitch data TNi+2 is output from the key press standby memory 3. In this key press standby state, the latch circuit 7 outputs the pitch data to be generated next (next pitch data) TNi+1, and the latch circuit 10 outputs the pitch data currently being generated (current pitch data) TNi.
The memory 4 outputs code length data TLi+2, and the latch circuit 8 outputs next code length data TLi+1. The gate circuit 22 turns on/off sound generation based on pitch data. For example, in conjunction with the sound generation select switch 23, when this switch 23 is on, depending on the key pressed on the keyboard 9, only the key-on signal is sent to the musical sound forming circuit. 14 to generate a melody sound based on the pitch data from the latch circuit 10,
If the pressed key comparison circuit 16 also generates a matching signal EQ when any key is pressed regardless of whether the pressed keys match or do not match, it is possible to perform the desired melody using the correct pitch data read from the musical score 1. This can be done according to key press timing. Furthermore, when the sound generation select switch 23 is off, musical tones are generated based on the player's key performance according to the lamp display by the key press display circuit 11. The key press deviation measuring circuit 25 receives the current note length data TLi taken in from the latch circuit 8 in synchronization with the data taking in the latch circuit 10, and the tempo signal generation circuit 13.
The difference between the timing at which the key corresponding to the next pitch data TNi+1, which is determined based on the tempo clock LCK generated by the ) generates tempo correction data △TP. Furthermore, if the key press timing is delayed from the key press timing, a stop signal STP is generated. When the first match signal EQ is generated, the tempo signal generating circuit 13 first generates tempo clocks LCK and TCK having a frequency corresponding to the standard tempo (absolute value) data TPA taken in at the start. Thereafter, this tempo data is corrected based on correction data from the key press deviation measuring circuit 25 every time a coincidence signal EQ is generated, and the tempo clock LCK,
The TCK frequency, that is, the model tempo, is made to follow the tempo of the key performance. In addition, the tempo that was made to follow this key performance is restored data from memory 3.
When the RD is read out and the automatic return signal AR is given from the tempo/return data detection circuit 12, and when the performer operates the return switch 26 such as an expression switch, the music progresses. Therefore, it is replaced with the standard tempo (absolute value conversion) data that is updated sequentially, and the tempo clocks LCK and TCK are immediately switched to a frequency corresponding to a tempo appropriate for the phrase of the song. Note that the tempo clock LCK is a tempo clock that is constantly generated after the first match signal is generated until the automatic performance is ended by a stop switch (not shown), etc., and the tempo clock TCK is a tempo clock that is generated by further adding the tempo clock LCK from the key press deviation measurement circuit 25. This prevents the signal from passing when the stop signal STP occurs. Therefore, when the pattern pulse is read out from the pattern memory 27 using the tempo clock TCK, if the key press timing is delayed, the readout of the pattern pulse is stopped by the stop signal STP. It is possible to achieve consistency in performance. The rhythm sound source 28 and an accompaniment sound forming circuit (not shown) form rhythm sound signals and accompaniment sounds such as chords and bass sounds based on pattern pulses read out from the pattern memory 27 by the tempo clock TCK, and provide these to the sound system 15 to generate rhythm sound signals. Pronounce it as a sound or an accompaniment sound. Note that various well-known devices can be used as the device for generating pattern pulses in this way, the device for forming accompaniment sounds such as chord tones and bass tones based on the pattern pulses, and the device for forming rhythm sounds. A detailed configuration description will be omitted in this specification. (Detailed Operational Description of Key Pressing Displacement Measuring Circuit 25) FIG. 2 shows a detailed block diagram of the key pressing deviation measuring circuit 25. As shown in FIG. In the figure, when the first coincidence signal EQ1 is input in accordance with the key press display based on the pitch data TN1 as described above, the down counter 31 receives the preset data PSD from the latch circuit 8 (Figure 1).
Then, the tempo clock LCK pulse applied from the tempo signal generating circuit 13 (FIG. 1) via the AND circuit 32 is counted down. In this key depression measuring circuit 25, the down counter 3
When the count output of 1 becomes 0, the coincidence signal EQ1
Keys displayed after the occurrence (pitch data TN2)
The key is set at the timing when the key should be pressed. Hereinafter, cases where the key press timing of the second tone (TN2) is earlier than the key press timing, and cases where the key press timing is coincident with or later than the key press timing will be explained. (1) When the key press timing is earlier If the key press timing is earlier than the key press timing, the second tone (TN2) is output before the counting output of the down counter 31, shown by the dashed line in FIG. 3, reaches 0.
A match signal EQ2 is generated. At this time, since the output of the OR circuit 33 in FIG. 2 is "1", when the match signal EQ2="1" is generated, the AND circuit
generates an output "1", so the selector 35 selects input A. Therefore, the selector 35 selects the down counter 31 supplied via the limiter 36.
Conversion table that uses count output as address signal
The output of the ROM (read only memory) 37 is output as tempo correction data ΔTP. conversion
The ROM 37 is provided with a table of tempo correction (acceleration) data corresponding to the key press timing shift amount when the key press timing is early, which corresponds to the right half of the graph in FIG. 4, that is, the count output of the down counter 31. Also, conversion table ROM3
8 is provided with a table corresponding to the left half of the graph in FIG. 4, and this table is referenced by the count output of the up counter 39 when the key press timing is late, and outputs tempo correction (deceleration) data. . As you can see from Figure 4, ROM37 and 38
A different table is used, but this is to achieve a balance between the ability to follow the tempo to the key performance and the stability of the tempo.If the key press timing is too late, a stop signal STP is generated and automatic playback is performed. The amount of tempo correction is reduced because the timing of the automatic performance and the key performance are made to match. Note that the limiter 36 limits the counting output of the down counter 31, and by limiting the counting output when the key press timing is extremely early, prevents the tempo data from being drastically modified, and prevents erroneous key presses. The aim is to prevent instability of the tempo due to such factors. (2) When the key press timings match After the note length data TL1 is preset in the down counter 31, the key press timings (Fig. 3)
to), the count output of the counter 31 becomes 0, and the output of the OR circuit 33 becomes "0". Therefore, AND circuits 32 and 34 become non-conductive. Therefore, the down counter 31 receives the clock pulse LCK.
is not supplied, and the counting output remains 0 until the next match signal EQ3 presets the note length data TL2.
The selector 35 continues to have input B selected by the output of the inverter 41. In this state, that is, when a coincidence signal EQ2 is generated due to the key press, the key press deviation measuring circuit 25 uses the count output 0 of the up counter 39 as an address.
Tempo correction data read from ROM38△
Generates TP=0. Therefore, of course, in this case, the model tempo (the tempo at which the keys should be played, that is, the tempo for automatic performance) is not corrected. (3) When the key press timing is late When the key press timing shown in FIG.
The output of ROM38 remains selected. Also,
Since the output of the OR circuit 33 is "0", the stop signal STP="1" is generated from the inverter 42, and therefore the progress of the automatic performance is stopped until the coincidence signal EQ2 is generated, and the timing of the key performance is adjusted. The goal is to achieve consistency. When the output of the OR circuit 33 becomes “0”,
Furthermore, the reset of the up counter 39 is released, and the up counter 39 counts the clock pulse LCK supplied via the AND circuit 43.
A counting output shown by the dotted line in FIG. 3 is generated. The tempo correction (deceleration) data △TP in Figure 4 obtained by addressing the ROM38 with this count output is selected by selector 3.
5, and the tempo signal generating circuit 13 takes in the data ΔTP when the matching signal EQ2 is generated from among the data ΔTP and corrects the tempo. The maximum value detection circuit 44 generates an output "1" when the count output of the up counter 39 reaches a predetermined value. The AND circuit 43 transfers this output to the inverter 45.
The up counter 39 is made non-conductive by the output "0" which is inverted by the clock pulse.
The supply of LCK is stopped and counting is stopped when the count output reaches the predetermined value (horizontal portion of the dotted line in FIG. 4). By controlling the maximum count value of the up counter 39 in this way, it is possible to prevent erroneous count output, generation of tempo correction data △TP, and extremely slow tempo due to re-counting from 0 after an overflow. There is. In addition, in the above operation explanation, the first and second
Although the pitch data TN1, TN2 of the th note and the first note length data TL1 have been described, key press deviation measurement and tempo correction data ΔTP are similarly sent for subsequent note length data TLi, etc. (Detailed Operational Description of Tempo Signal Generating Circuit 13) FIG. 5 shows a detailed block diagram of the tempo signal generating circuit 13. In this automatic performance machine, after reading the data recorded on the magnetic stripe 1a of the musical score 1 and storing it in the memories 3 and 4, a start set switch (not shown) is pressed (FIG. 6 to), and the beginning of the pitch memory 3 is pressed. When the first standard tempo (absolute value) data TPA stored at the address is read by the read/write control circuit 5, this data
Tempo/return data detection circuit 12 by TPA
is the tempo absolute value signal ABT and the read tempo data
Generate MTP. Referring to FIG. 5, this read tempo data MTP is input to one terminal of an adder circuit 61, but a gate circuit 62 receives a signal RLT=
Since it is disabled by “0”, the adder circuit 6
Since the input of the other terminal of 1 is 0, the adder circuit 6
1 supplies the read tempo data MTP as it is to the input terminal of the progressing tempo register 63 as an addition output. At this time, the signal ABT="1" is input to the load input terminal of the register 63 via the OR circuit 64, and therefore, the read tempo data MTP is stored in the register 63 as is as standard tempo data (No. (Dotted chain line in Figure 6). Also, the signal
ABT="1" means delay circuit 65 and OR circuit 66
The output of the OR circuit 66 is further applied to the selector 67 as an A input selection signal.
8 to the load input terminal of the tempo control register 69. Therefore, register 63
The standard tempo data output by is stored in the register 69 via the selector 67 (solid line in FIG. 6). A frequency division ratio memory 71 converts the standard tempo data output from the register 69 into a frequency division ratio, and a tempo oscillator 72 generates a tempo clock LCK having a frequency obtained by dividing a predetermined clock by this frequency division ratio. The tempo clock TCK is the tempo clock LCK outputted via an AND circuit 73.The AND circuit 73 has one input terminal connected to the key press deviation measurement circuit 25.
By applying the stop signal STP generated by the inverter 74, this stop signal STP becomes "0".
When this occurs, a clock TCK similar to the clock LCK is generated, and when a stop signal STP="1" is generated, the clock TCK is not output. Note that this tempo oscillator 72 does not operate until the pressed key comparison circuit 16 (FIG. 1) generates the first matching signal EQ1.
Therefore, automatic performance of rhythm and accompaniment does not start. These automatic performances are started in synchronization with the first coincidence signal EQ1 from the key performance. If there is a key press deviation after the start of key performance, the key press deviation measurement circuit 25 (FIG. 3) supplies tempo correction data ΔTP corresponding to the key press deviation amount. This modified data ΔTP is added to the tempo data stored in the register 69 in the adder circuit 76 via the gate circuit 79 enabled by the coincidence signal EQ. This addition output is applied to the B input terminal of the selector 67, which selects the B input except during start set and when a return signal is generated, which will be described later.
A match signal EQ applied to the load input terminal of the register 69 via the register 69 causes the register 69 to be stored. Therefore, the tempo data in the register 69 is the tempo correction data △ generated in synchronization with the coincidence signal EQ.
Modified by TP, the tempo of this automatic performance will follow the tempo of the key performance. Pitch data is read out sequentially from the memory 3 (Figure 1) as the keys are played, but where the standard tempo changes as the song progresses, standard tempo (relative value) data TPR is read out (Figure 6). t1,
t3). Then, the tempo/return data detection circuit 12
(Fig. 1) detects the data TPR by the identification mark attached to this data and generates a tempo relative value signal.
Generates RLT and read data MTP (=TPR).
This read data MTP is applied to adder 76 via gate circuit 80. Signal RTL enables gate circuit 80 and is applied via OR circuit 68 to the load input terminal of register 69. As a result, the standard tempo (relative value) data TPR is added to the tempo data in register 69 and stored in register 69 as new tempo data, and the tempo of automatic performance is changed every time standard tempo (relative value) data is generated. be done. On the other hand, this read data
MTP is supplied to one input terminal of the adder circuit 61, and since the signal RLT enables the gate circuit 62, the other input terminal of the adder circuit 61 is supplied with the conventional standard tempo stored in the register 63. Data is supplied. Furthermore, the signal RLT is applied to the register 63 via the OR circuit 64 as a load signal. Therefore, data obtained by adding the newly read standard tempo (relative value) data TPR to the previous standard tempo data by the adder circuit 61 is newly stored in the register 63. The reason for using relative value data as a new standard tempo during performance is
This is to change the tempo of automatic performance based on the tempo that follows the key performance, and if you want to prevent the tempo of automatic performance from changing even if the relative signal RLT arrives during performance, change the new standard tempo during performance. Absolute value data can also be used as Of course, when absolute value data is used, the amount of data (number of bits) is larger than when relative value data is used. Furthermore, when the absolute value is used, the gate circuit 62 becomes non-conductive, so the read data MTP is stored as is in the register 63 as at the start, and the standard tempo data is also stored in the register 69 (t2 ). In the memory 3, tempo return data RD is stored together with pitch data and standard tempo data at a desired location, such as at the time of transition from melody performance to interlude. When the tempo/return data detection circuit 12 reads out this return data RD from the memory 3 (t4)
Generate automatic return signal AR. This signal AR is the select switch 77 for selecting automatic performance return mode.
and is supplied to the OR circuit 66 via the OR circuit 78. Therefore, under the condition that the select switch 77 is turned on, the output of the OR circuit 66 becomes "1", and the output "1" of the OR circuit 66 is applied to the selector 67 as a selection signal to select the A input, as in the start setting. It is also applied to the register 69 via the OR circuit 67 as a load signal.
As a result, the standard tempo data stored and output by the register 63 is loaded into the register 69 via the selector 67, and the tempo of automatic performance returns from the tempo that followed the key performance to the original tempo of the song. becomes. Note that the return to the standard tempo can also be performed by the player operating the tempo return switch 26. In this case, when the performer turns on the return switch 26, the return signal RT="1" is applied to the second input terminal of the OR circuit 78.
The output of 8 becomes "1". Therefore, the standard tempo data output from the register 63 is taken into the register 69 in the same manner as in the case of the automatic return signal AR described above, and the tempo of the automatic performance is returned to the standard tempo. (Effects of the Invention) As described above, according to the present invention, the discrepancy between the key pressing timing recorded on the magnetic stripe of the musical score and the key pressing timing of the key performance is detected, and automatic performance is performed according to the amount of discrepancy. By successively correcting the tempo, it is possible to match the timing of key presses and the timing of automatic performance, and also to register an appropriate tempo, that is, a standard tempo, for the ongoing phrase according to the progress of the music recorded on the magnetic stripe, etc. Since the tempo of automatic performance can be immediately returned to the standard tempo by giving a return signal, even if the tempo of automatic performance deviates by a wide range from the standard tempo, It is possible to immediately perform a performance at a standard tempo and in accordance with automatically performed rhythm tones or accompaniment tones.

[Brief explanation of drawings]

FIG. 1 is a block diagram of an automatic musical instrument according to an embodiment of the present invention, FIG. 2 is a detailed block diagram of a key depression detection circuit in the musical instrument of FIG. 1, and FIG. A time chart to explain the operation of the counter in the circuit, Figure 4 is a graph showing the relationship between input and output of the ROM in the circuit of Figure 2, and Figure 5 is a detailed diagram of the tempo signal generation circuit in the musical instrument of Figure 1. FIG. 6 is a block diagram and a time chart for explaining the operations of the progress register and tempo control register in the circuit of FIG. 1... Sheet music, 1a... Magnetic stripe, 2...
Musical score data reading device, 3...pitch data memory,
4... Sign length data memory, 5, 6... Read/write control circuit, 7, 8, 10... Latch circuit, 9...
Keyboard, 11...key press display circuit, 12...tempo/
Return data detection circuit, 13... Tempo signal generation circuit, 14... Musical tone forming circuit, 15... Sound system, 16... Key press key comparison circuit, 19... Pitch mark detection circuit, 25... Key press deviation measurement circuit,
26... Return switch, 27... Pattern memory, 28... Rhythm sound source, 31... Down counter, 35... Selector, 37, 38... ROM,
39...up counter, 63...progress register, 71...dividing ratio memory, 72...tempo oscillator, 77...select switch, 78...OR circuit.

Claims (1)

[Scope of Claims] 1. A keyboard, and a memory means in which music data including at least key press timing data and standard tempo data according to the progress of the music is stored, and is sequentially read out from the memory means. A tempo control device for an automatic musical instrument that performs an automatic performance according to data, the device comprising: a key press deviation detection means for detecting a deviation between a key press timing on the keyboard and the key press timing; a progressing tempo register that takes in the latest standard tempo data among the data read out sequentially; a tempo return signal generator; A tempo control register that stores tempo data that follows the key press timing based on the output of the key press deviation detection means, and a tempo oscillator that generates a tempo clock at a cycle corresponding to the tempo data stored in the tempo control register. A tempo control device comprising: 2. The tempo control device according to claim 1, wherein the tempo return signal generator includes an operation switch, and generates the tempo return signal upon detecting that the switch is operated. 3. The music data includes tempo return data,
2. The tempo control device according to claim 1, wherein said tempo return signal generator generates said tempo return signal from tempo return data in this music data.