JP3354047B2 - Code conversion device and electronic musical instrument equipped with the code conversion device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a code conversion device and an electronic musical instrument provided with the code conversion device, and in particular, to search for a code type that can be logically replaced with the code by designating a key and a code type. The present invention relates to a code conversion device for displaying, and an electronic musical instrument provided with the code conversion device.

[0002]

2. Description of the Related Art Generally, chords are considered to be composed of four roots (root, third, fifth and seventh).
Triads with the seventh sound omitted, 9 above the seventh,
A code obtained by adding 11, 13 degrees or the like is called a tension code. Although this tension chord was originally derived from jazz, it is commonly used in recent songs such as pops, which makes the sound of chords very rich. 2. Description of the Related Art Conventionally, in an electronic musical instrument such as an electronic piano and a synthesizer, there has been an automatic accompaniment apparatus that generates a musical sound signal for accompaniment based on chord progression information stored in a ROM or the like in advance or written by a user. In this automatic accompaniment device, any chord type including a tension chord could be used.

[0003]

Conventionally, automatic accompaniment devices have been provided with a function of using any chord type including a tension chord, but for beginners who are not familiar with music theory, There is a problem in that it is not known which tension cords should be used in what combination, and the functions of the automatic accompaniment device cannot be fully utilized. SUMMARY OF THE INVENTION An object of the present invention is to solve the above-described problems of the prior art, and to search and display a code type that can be logically replaced with the code simply by specifying a key and a code name. An object of the present invention is to provide a simple code conversion device and an electronic musical instrument provided with the code conversion device.

[0004]

Means for Solving the Problems The present invention provides a distance calculating means for obtaining a distance between a key and a code root for a given code, and whether the code is of a basic code type.
Determining means for determining whether the code is a basic code type.
If it is determined that the code is not for
Classification means for classifying into any of the code types, and
The distance calculated by the distance calculating means and the code are
Based on the basic code type,
Tension cord to find a tension code that can be used
It is characterized in that it has a code search means .

According to the present invention, a list of tension codes which can be used at that time can be obtained by inputting or selecting a simple code name such as a key and a triad or a basic code. By displaying and selecting an arbitrary code from the displayed code, it is possible to easily select a correct tension code without requiring advanced music knowledge. If the electronic musical instrument is provided with this chord conversion device and a well-known automatic accompaniment device, it is possible to convert a chord progression using a simple chord into a rich sounding chord progression using a tension chord, and perform an automatic accompaniment. It becomes possible.

[0006]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a block diagram showing a configuration of an electronic piano to which the present invention is applied. CPU1
Is a central processing unit that controls the entire electronic piano based on a control program stored in the ROM 2.
The ROM 2 stores control programs, tone parameters, chord progression data, and the like. The tone color parameters include musical tone waveform address information and envelope control information stored in the waveform memory. The RAM 3 is used as a work area and a buffer, and also stores code progress information written by a user. Further, it may be backed up by a battery or the like. The panel circuit 4 includes various switches for tone color selection and the like, a display device for displaying characters and the like by liquid crystal and LED, and an interface circuit for them.

The keyboard 5 includes, for example, a keyboard composed of a plurality of keys each having two switches, and a circuit that scans the state of each key switch, detects a change in the state, and generates key event information and touch information. Become. The tone generator 6 is a circuit for generating a desired tone signal by, for example, a waveform readout method. The tone generator 6 sequentially outputs waveform data from a waveform memory storing digital tone waveform sample values at address intervals proportional to the pitch to be sounded. A readout and an interpolation operation are performed to generate a tone waveform signal. It also has an envelope generating circuit, multiplies the tone waveform signal by an envelope signal generated based on the set envelope parameters, gives an envelope, and outputs a tone signal. The tone generation circuit 6 includes a plurality (for example, 32)
However, in practice, a plurality of tone signals can be simultaneously and independently generated by operating one tone generating circuit in a time-division multiplex manner.

[0008] The D / A converter 7 converts the digital tone signal into an analog signal, and the tone signal amplified by the amplifier 8 is generated from a speaker 9. The bus 10 connects each circuit in the electronic piano. If necessary, a memory card interface circuit, a floppy disk device, a MIDI interface circuit, and the like may be provided.

FIG. 2 is an explanatory diagram showing an example of a correspondence table between keys or chord roots (root sounds) and numerical values. In this example, numerical values as shown are stored in correspondence with twelve tones in semitone units in one octave from C (do) to B (si). In this embodiment, C is set to 0 because the chord progression is often stored or displayed using the normal key as C major. However, when implementing the present invention, for example, any note name may be freely associated with 0.

FIG. 3 is an explanatory diagram showing the contents of a correspondence table of distance symbols (using Roman numerals) and distance values in semitone units when chord progression information is represented by function codes inside the electronic piano. It is. Generally, the code name is the root name (C-B) and the code type (m, 7, et)
Notation in combination with c.). This route name is represented by a distance from the tonic (main tone, key), and a simple code type is called a function code. For example, "I" indicates that the sound distance between the chord root and the key is 0, that is, equal, and "V" indicates that the distance in semitone units is 7.

FIG. 7 is a flowchart showing the tension display process. This process is started when the user operates the panel to instruct execution of the tension display process. In step S1, the user selects, for example, one of the chord progression information stored in advance, and the CPU proceeds to the chord progression information and key information of the chord progression (for C-B and major / minor).
Take in.

In step S2, one piece of code information is read from the chord progress information, and in step S3, the distance (function code) between the key and the code root is obtained. For this purpose, first, the key and the chord root are digitized using the table of FIG. For example, when the key is “C major” and the chord root is “G”, the numerical value of the key is “0” and the numerical value of the chord root “G” is “7”.
0 = 7. For example, when the key is “A” and the chord root is “E”, the difference is 4−9 = −5.
When the difference is negative, 12 is added to become "7". Next, referring to the table in FIG. 3, the distance “7” is converted into a distance symbol “V”. That is, the function code corresponding to “G” when the key is “C” is “V”.

In step S4, it is determined whether or not the code type of the code read in step S2 is the basic code type. The basic chord types are six chord types of $ 7 (major seventh), m7 (minor seventh), 7, m7 ^(b5) , m6, and dim. If the result of the determination is negative, the process proceeds to step S5. In step S5, it is determined whether or not the code is a triad. If the result is affirmative, the process proceeds to step S6, but if negative, the process proceeds to step S7.

In step S6, the triad code is converted to the basic code type using the table A shown in FIG. In Table A, the horizontal axis represents the distance symbols (I to VII) obtained in step S3, and the vertical axis represents the major /
It is classified by minor. For example, when the function code is “V” major, the type is “7” from Table A, so the function code is “V7”. The blank column corresponds to a code that is not normally used, and there is no problem.

In step S7, other codes such as tension codes are converted into basic code types using the table B shown in FIG. In Table B, the corresponding code types are classified according to the basic code types. For example, in the case of “11” (Elevens), a search in the table reveals that it belongs to the “7” system. Note that blank parentheses in each code type, or squares in parentheses, indicate that any symbol is included therein.

In step S8, a tension type that can be used in place of the read code is obtained with reference to the table C shown in FIG. Then, the code name is displayed in combination with the original code route. Table C
Stores the combination of the distance symbol obtained in step S3 and the basic code type obtained in steps S4 to S7, that is, the tension type that can be used for each function code. Here, the user may select any one of the listed tension codes and save the chord progression made of the selected tension code. In step S9, it is determined whether the end of the chord progression has been reached. If the result is negative, step S9 is executed.
Returning to step 2, the process is repeated. With the above processing, it is possible to easily select an appropriate tension code for each code.

Next, an example of conversion of chord progression will be described. For example, chord progression where the key is “G”, CDB
When the tension display process is performed for mE..., a distance symbol between the key "G" and the first chord root "C" is obtained by the process of step S3. When the key "G" is digitized in the table of FIG. 2, "7" is obtained.
And “C” is “0”. Therefore, the difference is 0-
7 = −7, and 12 is added to become “5”. When this is converted into a distance symbol by the table of FIG. 3, "IV" is obtained.
Becomes

Next, since "C" is a triad, it is converted to the basic code type "$ 7" with reference to the "IV" column of table A in FIG. When the function code for “C” is determined to be “IV @ 7”, the type of the available tension code “{@}” is now referred to with reference to Table C in FIG.
9 "," 6 ⁽⁹⁾ ", and" $ 7 ^{(# 11)} ". to this,
By combining the original chord root “C”, “C「
9 "," C6 ⁽⁹⁾ "and" C ^@ 7 ^{(# 11)} "are displayed. Then, when the user selects, for example, “C $ 9”, the tension code name is stored in the chord progression storage area, and the tension display processing of the next code is performed.

Thereafter, the same processing is performed, and CD-Bm
-E ... as a function code corresponding to IV @ 7-V7-III
.. are obtained and the corresponding tension codes are, for example, C △ 9-D9 ⁽¹³⁾ -Bm7 ^(b13) -E7.
A chord progression such as ^{(# 9, b13)} is obtained. In the electronic musical instrument, the embodiment has been described so far as the performance of the accompaniment is performed by the well-known automatic accompaniment function using the chord progression. However, the following modified examples are also conceivable. In the embodiment, an example in which the user manually selects one of the displayed tension codes is disclosed. However, a function of automatically selecting a tension code automatically may be added. In this way, a tension code can be applied to the chord progress at once. In addition, when an arbitrary chord progression is automatically performed, a function of automatically adding an appropriate tension to a triad or a basic chord type chord may be provided. In this way, simultaneous application and confirmation of the sound can be performed simultaneously.

When the original code is a tension code, the original tension code may be displayed as it is without performing the conversion processing of the present invention. May be displayed together with the original code. Alternatively, an arbitrary code type may be input, and not only the tension code, but also all code types that can be replaced with the code type, including triads and basic code types, may be displayed. When displaying usable tension codes, they may be displayed in descending order of frequency of use. Note that the present invention can be implemented in a dedicated automatic accompaniment device, a personal computer, or the like, in addition to an electronic musical instrument such as an electronic piano, a silence-type piano, and a synthesizer.

[0021]

As described above, in the present invention,
When the user enters or selects a key and a simple code name such as a triad or a basic code, a list of available code types is displayed, and an arbitrary code is selected from the list. Thus, there is an effect that it is possible to easily select a correct tension code without requiring advanced music knowledge. If the electronic musical instrument is provided with this chord conversion device and a well-known automatic accompaniment device, it is possible to convert a chord progression using a simple chord into a rich sounding chord progression using a tension chord, and perform an automatic accompaniment. There is an effect that it becomes possible.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of an electronic piano to which the present invention is applied.

FIG. 2 is an explanatory diagram showing an example of a correspondence table between keys or chord roots (root sounds) and numerical values.

FIG. 3 is an explanatory diagram showing the contents of a correspondence table between distance symbols and distance values in a function code.

FIG. 4 is an explanatory diagram showing the contents of a table for converting a triad code into a basic code type.

FIG. 5 is an explanatory diagram showing the contents of a table in which corresponding code types are classified according to basic code types.

FIG. 6 is an explanatory diagram showing the contents of a table storing available tension types for each function code.

FIG. 7 is a flowchart showing a tension display process.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... CPU, 2 ... ROM, 3 ... RAM, 4 ... panel circuit, 5 ... PAD circuit, 6 ... tone generation circuit, 7 ... D / A converter, 8 ... amplifier, 9 ... speaker, 10 ... bus

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-4-346399 (JP, A) JP-A-2-83591 (JP, A) JP-A-63-318598 (JP, A) 9587 (JP, B2) Toshihiko Iida, "Jazz Harmony I Can Learn Easily 1" All Music Publishing Co., Ltd., September 25, 1983 (58) Fields surveyed (Int. Cl. ⁷ , DB name) G10H 1/36 -1/42 G10G 1/00-3/04

Claims (2)

(57) [Claims] 1. A key designating means for designating a key (main tone); a code designating means for designating a code; a distance calculating means for finding a distance between the designated key and a chord root; Discriminating means for discriminating whether or not the code is one of the basic code types; and classifying means for classifying the code into one of the basic code types when it is determined that the code is not of the basic code type. the function code to the search key that combines distance and basic code type determined by, the function
A code conversion device, comprising: a tension code search unit that searches a correspondence table storing a tension code for each code to obtain a usable tension code instead of the designated code. 2. An electronic musical instrument having an automatic accompaniment device, further comprising the code conversion device according to claim 1.