JPH064397Y2 - Automatic accompaniment device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to an automatic accompaniment apparatus for generating an arpeggio sound or a bass sound by specifying a chord.

[Prior art and its problems]

Conventionally, only the pattern data corresponding to C major is normally stored in the storage means that stores the pattern data required to generate arpeggio sounds or bass sounds corresponding to the root note and type of the chord. Has been done. Then, with respect to the pattern data read from this storage means, first, the pattern data is changed according to the type of code. For example, if the minor chord is specified, the pitch data corresponding to the pitch name E is reduced by a semitone. If the augment chord is specified, the pitch data corresponding to the pitch name G is increased by a semitone. Then, the pitch data corresponding to the root note of the chord is added to the pattern data changed according to the type of chord, and the accompaniment sound is emitted based on the pitch data obtained by this addition. Was.

However, since the conventional automatic accompaniment apparatus only changes the pitch data of only the constituent voices of the chord in the pattern data according to the type of chord, the arpeggio pattern in C major is constructed as shown in FIG. If C minor is specified, the result will be as shown in FIG. Here, there is a problem that the second pitch and the third pitch have the same pitch and the originally intended semitone progression cannot be realized.
Similarly, when the bass pattern corresponding to C major is configured as shown in FIG. 5, when C diminish is designated, it becomes as shown in FIG. Here, the third and fourth
The pitch becomes the same as that of the sound, and the same problem as described above occurs.

[Purpose of device]

The present invention has been made in view of the above circumstances, and an object thereof is to provide an automatic accompaniment device capable of reliably realizing semitone progression regardless of the type of chord.

[Key points of device]

In order to achieve such an object, the present invention provides chord data not only for chord constituent sounds but also for pitch data corresponding to sounds other than chord constituent sounds for the pattern data read from the storage means. A means for changing the value according to the type is provided, and the changed pitch data and the pitch data corresponding to the constituent sounds of the chord changed according to the type of chord do not match. To do.

[Structure of Example]

An embodiment of the present invention will be described below in detail with reference to the drawings.
FIG. 1 is an overall circuit diagram of the automatic accompaniment apparatus, and reference numeral 1 in the figure is a keyboard portion composed of a plurality of keys. The output from the keyboard section 1 is input to the chord detection section 2 to detect the root note type of the chord. The rhythm counter 3 performs a counting operation based on the clock signal from the clock unit 4, and the output signal is input to a ROM (read only memory) 5 in which accompaniment pattern data is stored, and the pattern data is sequentially output. The pattern data from the ROM 5 is input to the divider 6 and the adder 7. The divider 6 sends the remainder of the pattern data divided by 12 to the decoder 8. Here, the pattern data in the ROM 5 is formed in a format of “12 × octave information + note name information”. The data output from the divider 6 is "0-
The data corresponds to the note names C to B of "11".

Details of the decoder 8 are shown in FIG. The AND circuit E ^b- directly outputs the signal of the first bit and the second bit from the divider 6,
The signals from the third bit and the fourth bit are respectively fed to the inverter I
3 and I4, as well as the signals indicating the minor, minor sevens, and diminish from the code detector 2 are input via the OR circuit O1. The AND circuit G ^{# +} directly inputs the 4th bit signal from the divider 6 to 1
The signals from the second bit, the third bit, and the third bit are input through the inverters I1, I2, and I3, respectively, and the signal indicating the augment from the code detection unit 2 is input. The AND circuit G ^b- is the second bit from the divider 6,
The signal of the third bit is directly input from the first bit and the signal of the fourth bit through the inverters I1 and I4, respectively, and the signal indicating the diminish from the code detection unit 2 is input. AND circuit E ^- directly to the third bit of the signal from the divider 6, 1 bit, second bit, a signal of 4 bit and inputs via the respective inverter I1I2, I4, from the code detector 2 The signal indicating the minor, minor sevens, and diminish of the OR circuit O
Inputting via 2. AND circuit G ^- 1 bit from the divider 6, the second bit, the direct signal of the third bit, a signal of 4 bit and inputs via an inverter I4, a diminished from the code detector 2 The signal shown is being input. AND circuit G ⁺ is 1 from the divider 6
Directly input the signal of the 2nd bit, 3rd bit, 4th bit
The signal from the bit-th bit is input through the inverter I4, and the signal indicating the augment from the code detection unit 2 is input. The outputs of the AND circuits E ^b− , G ^b− , E ⁻ , G ⁻ are input to the OR circuit group O5 via the OR circuit O3. On the other hand, the outputs of the AND circuits G ^{# +} and G ⁺ are input to the OR circuit group O6 via the OR circuit O4. Here, the AND circuit E ^b- is when the data “3” corresponding to the note name E ^b is output from the divider 6 and the signal corresponding to any of the minor, minor sevens or diminish is output from the chord detection unit 2. Open and output signal. AND circuit G ^{# +}
When the data "8" corresponding to the note name G ^# is output from the divider 6 and the signal corresponding to the augment is output from the chord detection unit 2, it is opened and the signal is output. AND circuit G
^b- outputs the data "6" corresponding from the divider 6 to the pitch name G ^b, and then opened when the signal corresponding the code detector 2 Diminished it has output, and outputs a signal. AND circuit
E ^- is the divider 6 outputs the data "4" corresponding to the pitch name E from and to open when the code detector 2 minor or minor seventh or diminished signal corresponding to either the output, outputs a signal To do. The AND circuit G ^- is opened when the data "7" corresponding to the note name G is output from the divider 6 and the signal corresponding to the diminish is output from the chord detection unit 2, and outputs the signal. The AND circuit G ⁺ is opened when the data “7” corresponding to the note name G is output from the divider 6 and the signal corresponding to the augment is output from the chord detection unit 2, and outputs the signal.

The data “00000000” from the decoder 8,
"11111111", "00000001" and the above R
The pattern data from the OM5 is added by the adder 7,
The added value is input to the adder 9. Data indicating the root note of the chord detected by the chord detection section 2 is input to one input end of the adder 9, and the root note data of the chord and the data from the adder 7 are added. The output signal of the adder 9 is input to the sound source section 10, and upon receipt of the rising signal from the rhythm counter 3, creation of an accompaniment sound of the corresponding pitch is started. The output signal of the sound source unit 10 is the D / A converter 1
Sound is emitted via the amplifier 1, the amplifier 12, and the speaker 13.

[Operation of Example]

Next, the operation of the embodiment will be described. It is assumed that a sound output of an arveggio sound is selected by a switch operation (not shown), a rhythm type is designated, and the pattern shown in FIG. When the keyboard section 1 is operated at the timing of the bar head to specify C minor, the chord detection section 2 decodes the signal "C" indicating the root note to the adder 9 and the signal "minor" indicating the type. Output to 8. On the other hand, the data indicating the first tone C5 of FIG. 3 is input to the divider 6, and as a result data “0” is obtained and input to the decoder 8. In the decoder 8, the AND circuit
No output is generated from E ^b− , G ^{# +} , G ^b− , E ⁻ , G ⁻ , G ^+, and data “00000000” is output from the decoder 8 and is input to the adder 7 and is data indicating C5. Is added. Therefore, the output of the adder 7 becomes data indicating C5. This C5
Is the data indicating the root note C in the adder 9.
"0" is added. Therefore, the output of the adder 9 remains the data indicating C5. The data indicating this C5 is the sound source unit 1
Input to 0, and the rising signal from the rhythm counter 3 causes C
Arpeggio sound corresponding to 5 is created and D / A converter 1
Sound is emitted via the amplifier 1, the amplifier 12, and the speaker 13.

Next, when the data indicating the second sound D4 # in FIG. 3 is read from the ROM 5, the data "3" is obtained from the divider 6 and is input to the decoder 8. AND circuit in this decoder 8
An output signal is obtained from E ^b− , a signal is further output from the OR circuit O3, and is input to the OR circuit group O5. Therefore, the data “11111111” is output from the decoder 8, is input to the adder 7, and is added to the data indicating D4 # from the ROM 5. Here, the data indicating D4 # is “1”
The subtracted data indicating D4 is output from the adder 7. The data indicating D4 is further added with the data "0" indicating the root note C in the adder 9, and the data indicating D4 is output from the adder 9.

Next, when the data indicating the third sound E4 of FIG. 3 is read from the ROM 5, the data "4" is obtained from the divider 6 and is input to the decoder 8. AND circuit E in the decoder 8 ^-
An output signal is obtained from the OR circuit O3, and a signal is further output from the OR circuit O3 and input to the OR circuit group O5. Therefore, the data “11111111” is output from the decoder 8, is input to the adder 7, and is added to the data indicating E4 from the ROM 5. Then, the data indicating D4 # is output from the adder 7, and the data indicating E4 is further output to the root note C by the adder 9.
Is added to the data "0" indicating the above, and the adder 9 outputs the data indicating the D4 #.

Next, the data indicating the fourth sound G4 in FIG. 3 is read from the ROM 5 and input to the decoder 8. In this decoder 8, no output occurs from any of the AND circuits E ^b− , G ^{# +} , G ^b− , E ⁻ , G ⁻ , and G ⁺ , so that the decoder 8 outputs data “00000000”. Then, the data indicating G4 is output from the adder 7 and input to the adder 9.
Data indicating G4 is also output from the adder 9.

Next, the fifth tone C5 of FIG. 3 is read from the ROM 5,
As described above, the adder 9 outputs data indicating C5.

Therefore, when the C minor is specified on the keyboard 1, the arpeggio sound shown in FIG. 4 is emitted, and the originally intended second
The semitone progression of the sound and the third sound is realized.

Next, suppose that the sounding of the bass sound is selected, and the pattern shown in FIG. 5 is selected as the bass pattern corresponding to the currently specified rhythm. Then, the keyboard section 1 is operated at the timing of the beginning of the measure to specify the C diminish. Data indicating the first tone C3 in FIG. 5 is input to the divider 6, and as a result data “0” is obtained and input to the decoder 8. In this decoder 8, no output signal is obtained from the OR circuit O3 and the OR circuit O4, and the data "00000000" is output from this decoder 8. Therefore, the data indicating C3 is output from the adder 7 and input to the adder 9. Data indicating C3 is also output from the adder 9. Next, the data indicating the second sound C3 in FIG. 5 is read from the ROM 5, but the data indicating C3 is output from the adder 9 similarly to the first sound.

Next, when the data indicating the third sound F2 # in FIG. 5 is read from the ROM 5, the data "6" is obtained from the divider 6 and input to the decoder 8. AND circuit in this decoder 8
An output signal is obtained from G ^b-, and a signal is further output from the OR circuit O3 and input to the OR circuit group O5. Therefore, the decoder 8 outputs the data “11111111”, which is input to the adder 7 and is added to the data indicating F2 # from the ROM 5. Then, the data indicating F2 is output from the adder 7. Further, the data indicating F2 is added to the data "0" indicating the root note C by the adder 9, and the data indicating F2 is output from the adder 9.

Next, when the data indicating the fourth sound G2 in FIG. 5 is read from the ROM 5, the data "7" is obtained from the divider 6 and input to the decoder 8. AND circuit G in the decoder 8 ^-
From the OR circuit O3 through the OR circuit O3.
Enter in 5. Therefore, the data “11
111111 ”is output and input to the adder 7 and added with the data indicating G2 from the ROM 5. And adder 7
Outputs the data indicating F2 #, and the adder 9 also outputs the data indicating F2 #.

Next, the fifth tone C3 of FIG. 5 is read from the ROM 5,
As described above, the adder 9 outputs data indicating C3.

Therefore, when C diminish is specified on the keyboard 1, the bass sound shown in FIG. 6 is emitted, and the originally intended third sound is produced.
A semitone progression of the sound and the fourth sound is realized.

Although the number of types of codes detected by the code detector 2 is 5 in the above embodiment, the number is not limited to this and may be any number. Further, the pitch name other than the constituent of the chord, E ^b of the coding to root the C, G ^#, was used three G ^b,
Of course, it is safe to implement it for other pitch names.

[Effect of device]

The present invention changes the value of the pattern data read from the storage means in accordance with the type of chord, not only in the chord constituting tone but also in the pitch data corresponding to the tone other than the chord constituting tone. Means is provided so that the changed pitch data and the pitch data corresponding to the constituent sounds of the chord changed corresponding to the chord type do not match, so that the originally intended pattern is the chord type. Therefore, it is possible to obtain the effect of not being damaged.

[Brief description of drawings]

FIG. 1 is an overall circuit diagram of an automatic accompaniment apparatus to which the present invention is applied,
FIG. 2 is a detailed view of the decoder 8, FIG. 3 is a score showing an arpeggio pattern stored in the ROM 5, and FIG.
A score showing an example of sound output when a minor is designated, R in Fig. 5
A score showing a bass pattern stored in OM5, FIG. 6 is a score showing an example of sound output when C diminish is specified, and FIG. 7 is a score showing an example of sound output when a conventional C minor is specified, FIG. 8 is a musical score showing an example of sound emission when the conventional C diminish is designated. 2 ...... code detection unit, 5 ...... ROM 6 ...... divider, 8 ...... decoder ^{E b-, G # +, G} b-, E -, G -, G + ...... AND circuit O5, O6 ...... OR circuit group

Claims (1)

[Scope of utility model registration request] 1. A storage means for storing accompaniment pattern data, a reading means for reading out the accompaniment pattern data stored in the storage means, a chord designating means for designating a chord, and a chord designating means for designating the chord. Of the accompaniment pattern data read by the reading means based on the type of chord, a first changing means for changing a part of the accompaniment pattern data; and the accompaniment pattern data read by the reading means. A second change of changing the accompaniment pattern data matching the accompaniment pattern data changed by the first changing means in the same direction by the same amount as that of the changed accompaniment pattern data. Means and automatic accompaniment based on the modified accompaniment pattern data modified by the first modification means and the second modification means. Automatic accompaniment apparatus, characterized by comprising an automatic accompaniment means.