JPH0436399B2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an automatic accompaniment device that automatically generates accompaniment sounds such as chords, bass tones, rhythm tones, etc. Even beginners can make changes by determining chord progression and selecting and controlling accompaniment patterns. This allows you to enjoy the rich accompaniment.

Conventionally proposed automatic accompaniment devices generate chord timing signals, base interval signals, base timing signals, rhythm pattern signals, etc. by reading accompaniment pattern data from memory according to the type of rhythm selected by the performer. There are devices that control the generation of accompaniment sounds such as chords, bass sounds, rhythm sounds, etc. in accordance with these signals. However, in the case of such an automatic accompaniment device,
Once a rhythm type is selected, the accompaniment pattern is determined accordingly, which has the disadvantage that the accompaniment becomes monotonous.

In order to eliminate such monotony of accompaniment, it has been proposed to provide a variation selection operator and to vary the accompaniment by appropriately operating this operator during performance. However, according to this method, (1) it is extremely difficult for beginners to operate the selection controls according to the song idea during performance, and (2) when the number of variations is increased, the selection operation becomes difficult. As the number of children increases, operation becomes more difficult and the space for placing the controls increases;
There were problems such as.

SUMMARY OF THE INVENTION An object of the present invention is to provide a new automatic accompaniment device that can produce a wide variety of accompaniment without manual operations such as variation selection.

The automatic accompaniment device according to the present invention is characterized in that a chord progression is determined based on stored chord data, and an accompaniment pattern suitable for the chord progression is selected and controlled according to the determination result.
Hereinafter, embodiments shown in the accompanying drawings will be described in detail.

FIG. 1 shows an electronic musical instrument according to an embodiment of the present invention.

The melody key switch circuit 10 is connected to the upper keyboard 10a.
The melody tone generating circuit 12 includes a large number of key switches that respectively operate in conjunction with a large number of keys, and is adapted to supply melody key data corresponding to the pressed key to the melody sound forming circuit 12.

The melody sound forming circuit 12 forms a melody sound signal corresponding to the pressed key based on the supplied melody key data, and the formed melody sound signal is sent to the speaker 16 via the output amplifier 14.
is supplied to the system and converted into sound.

Therefore, when a key is pressed on the upper keyboard 10a, a melody tone corresponding to the pressed key is produced from the speaker 16.

A chord data memory 18 consisting of a RAM (random access memory) is used to store chord name data for each bar corresponding to the chord progression of a certain song.

Examples of means for inputting data into the memory 18 include those using the lower keyboard 20a, those using the microphone 22, those using the musical score sheet 24, and those using the magnetic tape 26.

Accompaniment key switch circuit 20 including lower keyboard 20a
When a chord is designated on the lower keyboard 20a, the chord name data CD indicating the designated chord name is supplied to the memory 18, and a write control signal WT is supplied to the write/read control circuit 28.

Here, the chord designation method in the accompaniment key switch circuit 20 includes a finger chord method and a single finger method, and either method can be selected. That is, when the finger chord method is selected, when a chord is specified by pressing a plurality of keys on the lower keyboard 20a, chord name data indicating the chord name is generated. For example, when the three keys C, E, and G are pressed, chord name data indicating C major is generated. In addition, when the single finger method is selected, one key on the lower keyboard 20a specifies the root note, and the other keys specify the chord type. For example, if you press only the C key, the C major When the C key and the nearby white key (or black key) are pressed, chord name data indicating C minor (or C seventh) is generated. Note that the chord type may be determined according to the number of keys pressed other than the root key.

Chord name data from accompaniment key switch circuit 20
The CDs are sequentially written into the memory 18 by the action of the write/read control circuit 28 corresponding to the write control signal WT.

When the voice recognition device 30 specifies a chord name by voice through the microphone 22, it supplies chord name data CK indicating the chord name to the memory 18 and also supplies a write control signal WT to the write/read control circuit 28. The chord name data in this case is
The CD is also written to the memory 18 in the same manner as described above.

The musical score character reading device 32 is equipped with an optical card reader or the like that sequentially reads the chord names written on the musical score sheet 24 as shown in FIG. 2a, for example, and reads chord name data corresponding to the chord names read. CD
is supplied to the memory 18 and the write control signal WT
is supplied to the write/read control circuit 28. The chord name data CD in this case is also written into the memory 18 in the same manner as described above.

The magnetic reader 34 reads chord name data from the magnetic tape 26.
Supplying CD to memory 18 and writing control signal
The WT is supplied to the write/read control circuit 28. The chord name data CD in this case is also written into the memory 18 in the same manner as described above.

After writing the chord name data for one song into the memory 18 using any of the data input means described above, the accompaniment start switch 36 can be turned on to start the accompaniment operation.

That is, when the switch 36 is turned on, the on signal is supplied to the write/read control circuit 28 as the read mode signal RM, so that the circuit 28 enters the read mode. When the write/read control circuit 28 enters the read mode, it supplies an address signal to the memory 18 in order to read the chord name data for the first four measures from the memory 18. Therefore, the chord name data for the first four measures is read out from the memory 18 at high speed and supplied to the chord name register circuit 38.

The chord name register circuit 38 has an eight-stage shift register having a circular loop, and the chord name data for the first four measures from the memory 18 is loaded into the shift register.

On the other hand, the ON signal of the switch 36 is supplied to the tempo oscillator 46, the counter 48, and the chord progression determination circuit 50 as an enable signal EN.
Therefore, counter 48 receives the tempo clock signal from tempo oscillator 46 and begins counting. Further, the chord progression determination circuit 50 generates a first read command signal RD in response to the enable signal EN, and supplies it to the chord name register circuit 38.

The chord name register circuit 38 reads out the four measures worth of chord name data previously loaded into the shift register in response to the read command signal RD, and supplies it to the chord progression determination circuit 50. In this case, in the chord name register circuit 38, the chord name data for four measures is once read out from the shift register, and then loaded again into the original stage of the same shift register via a circular loop.

Among the four measures of chord name data reloaded into the shift register, the chord name data of the first measure is transferred to the current chord register 40, and in response to this, the chord constituent note designation circuit 42 selects the chord name of the first measure. (For example, C major) chord constituent note designation data (C
In the case of major, data specifying three tones C, E, and G) is supplied to the chord sound source circuit 44.

The chord progression determination circuit 50 is the chord name register circuit 3
The chord progression is determined based on the four bars of chord data starting from 8, and an accompaniment pattern designation signal PTN is generated in accordance with the determination result. This accompaniment pattern designation signal PTN is a ROM (read only memory)
The data is supplied to an accompaniment pattern memory 52 consisting of:

The accompaniment pattern memory 52 stores accompaniment control data corresponding to various accompaniment patterns determined depending on chord progression mode and rhythm type.
Accompaniment control data corresponding to the accompaniment pattern selected by the accompaniment pattern designation signal PTN and the rhythm type designation signal from the rhythm type select switch (SW) circuit 54 is repeatedly read out according to the count output of the counter 48. As a result, a chord timing signal CT, a bass pitch signal BI, a bass timing signal BT, and a rhythm pattern signal RY are generated.

The chord sound source circuit 44 forms a chord signal based on the chord constituent note designation data from the chord constituent note designation circuit 42, and the sending timing of this chord signal is controlled in accordance with the chord timing signal CT. There is. Therefore, for example, chord signals corresponding to the three chords C, E, and G are sent out from the chord sound source circuit 44 in a form carved by the chord timing signal CT corresponding to the selected accompaniment pattern.

The chord signal from the chord sound source circuit 44 is supplied to the speaker 16 via the output amplifier 14, and is acoustically converted. Therefore, if the chords to be sounded in the first bar are the three chords C, E, and G, the speaker 16 will play these three chords.

The bass note designation circuit 56 specifies the bass note to be produced based on the chord name data and the bass pitch signal BI from the current chord register 40, and the bass note specification data from this circuit 56 is sent to the bass sound source circuit 58. Supplied.

The base sound source circuit 58 forms a base sound signal based on the supplied base sound designation data, and the sending timing of this base sound signal is controlled in accordance with the base timing signal BT. Therefore, the bass sound signal is a bass timing signal corresponding to the selected accompaniment pattern.
It is sent out from the base sound source circuit 58 in the form of BT.

The bass sound signal from the bass sound source circuit 58 is supplied to the speaker 16 via the output amplifier 14 and is acoustically converted. Therefore, if there is a bass note to be played in the first measure, that bass note will be played by the speaker 16.
It is played from.

The rhythm sound source circuit 60 receives the rhythm pattern signal RY.
This percussion instrument sound signal is supplied to the speaker 16 via the output amplifier 14. Therefore, when the switch 36 is turned on, percussion instrument sounds are rhythmically produced from the speaker 16 according to the selected accompaniment pattern (rhythm pattern).

After the automatic accompaniment of the first measure starts as described above, at the end of the first measure, the counter 48
generates the first bar pulse signal MP.

This bar pulse signal MP is supplied to the write/read control circuit 28, and chord name data of the fifth bar is read out from the memory 18 in response. and,
This read chord name data is loaded into a shift register within the chord name register circuit 38.

The chord progression discrimination circuit 50 receives the first bar pulse signal.
A second read command signal RD is supplied to the chord name register circuit 38 in accordance with MP, and chord name data of the first to fifth measures are read from the chord name register circuit 38 to the chord progression determination circuit 50 in response. be done. Then, the chord name data of the second bar is transferred from the chord name register circuit 38 to the current chord register 40.

The chord progression determination circuit 50 determines the chord progression based on the chord name data of the first to fifth bars, and sends out an accompaniment pattern designation signal PTN in accordance with the determination result. It is usually rare that the accompaniment pattern signal PTN at this time specifies a different accompaniment pattern from the previous one, and the accompaniment pattern memory 52 generates a chord timing signal corresponding to the same accompaniment pattern as the previous one.
CT, base pitch signal BI, base timing signal
BT and rhythm pattern signal RY are generated.

Therefore, the automatic accompaniment sound generation operation is performed for the second measure in the same manner as for the first measure described above. In this case, the chord and bass note generation operations are performed based on the updated chord name data from the current chord register 40, so the pitch of the generated chord and/or bass note is different from that of the first measure. It's possible.

After this, the counter 48 outputs the bar pulse signal MP
Each time a chord name register circuit 3 is generated, a chord name data reading operation similar to that described above is performed, and the chord name register circuit 3
An automatic accompaniment tone generation operation is performed based on the chord name data in 8. Note that the chord progression determination circuit 50 regularly performs a chord progression determination operation based on eight bars of chord name data from the chord name register circuit 38.

FIG. 2a shows an example of a cadence-type chord progression, and FIG. 2b shows an example of a bass note progression that can be adopted for the chord progression of a.

When the chord progression discrimination circuit 50 detects a special chord progression in terms of tonality, song format, etc. as shown in FIG.
For this reason, for example, as shown in Figure 2b, measure M _A
The operation of making the bass pronunciation patterns different between MB and _MB is automatically performed.

Note that by specifying a different accompaniment pattern using the accompaniment pattern specification signal PTN, it is possible to change not only the bass sound but also chords, rhythm sounds, etc., and the changes to each accompaniment sound are stored in memory. It is determined by the memory contents of 52.

In the above embodiment, the chord name data for each bar is stored in the chord data memory, and the chord name data is read out in response to the bar pulse signal. However, as another example, the chord data memory may store the chord name data and the chord name data. Note length data may be stored and chord name data may be read out based on the note length data. In this way, even more fine-grained accompaniment pattern selection control becomes possible.

Moreover, although the application of the present invention has been described above to the case of generating chords, bass tones, and rhythm tones as accompaniment tones, the present invention can also be applied to the case of generating accompaniment tones such as arpeggio tones.

As described above, according to the present invention, since the accompaniment pattern is selected and controlled by determining the chord progression, it is possible to generate an optimal accompaniment sound as the chord progression mode or the musical idea changes. Furthermore, since there is no need to perform any variation selection operations, even beginners can enjoy a variety of accompaniments.

[Brief explanation of drawings]

FIG. 1 is a block diagram of an electronic musical instrument according to an embodiment of the present invention, and FIGS. 2a and 2b are diagrams showing an example of a chord progression and a bass note progression, respectively. 18...Chord data memory, 28...Write/read control circuit, 38...Chord name register circuit, 44
... Chord sound source circuit, 46 ... Tempo oscillator, 48
... Counter, 50 ... Chord progression determination circuit, 52
... Accompaniment pattern memory, 58 ... Bass sound source circuit, 60 ... Rhythm sound source circuit.

Claims (1)

[Claims] 1 A storage means for storing chord data corresponding to a series of chord progressions, a first reading means for reading out the chord data from the storage means, and an accompaniment pattern by determining the chord progression based on the read chord data. a chord progression determination circuit that generates a designated signal; a storage device that stores accompaniment control data corresponding to various accompaniment patterns; a second reading device that reads out the accompaniment control data from the storage device; and a read accompaniment. an accompaniment sound signal generating means whose accompaniment sound signal generation operation is controlled in accordance with control data, and selecting and controlling accompaniment control data to be read from the storage device in accordance with the accompaniment pattern designation signal. Features an automatic accompaniment device.