JPH0719151B2 - Electronic musical instrument transposing device - Google Patents

Description

The present invention relates to a transposing device for an electronic musical instrument.

In recent years, with the development of electronic technology, the frequency accuracy of an oscillator has improved, and it has become possible to easily obtain a desired frequency signal.

An electronic musical instrument that uses this to generate a pure temperament scale that is not the conventional equal temperament scale has been announced.

In the case of just intonation, the chord has no turbidity and is beautiful, but there is a problem that transposition (transposition) is difficult. Therefore, the equal temperament with which transposition and transposition can be freely created was born. The problem remains. Therefore, many attempts have been made to technically solve the problem of transposition (transposition) even though it is just intonation.

The present invention relates to such a transposition, and provides a transposing device that can be easily transposed and that is free from inconvenience even with temperaments other than equal temperament.

In addition, as a well-known transposing device, it is general to operate a switch divided into chromatic scales to set how many times to move. In this case, it is necessary to calculate the difference between the key to be played (key to be pressed) and the key to be actually sounded, and input the frequency. This is quite troublesome even for experienced people, and it is a difficult task for beginners. In particular, in the case of just intonation, the semitones are not evenly spaced, so it is not possible to transpose with a method that raises or lowers the frequency like a conventional transposing device.

The present invention has improved on such points, and even if it is other than equal temperament, it can be easily transposed, and a key (tuning) can be specified at the same time. Therefore, the present invention provides a transposing device capable of independently realizing an arbitrary fundamental tone and an arbitrary pitch change amount.

In one embodiment of the present invention, as shown in FIG. 1, the key assigner 20 processes the data of the keyboard / tablet 10 and sends the data to the envelope generator 30, the waveform calculator 40 and the F number generator 50. The envelope generator 30 forms the envelope of the sound to be produced by the data, and the DAC 70
Send envelope data to.

The waveform calculator 40 calculates the waveform and transfers the waveform data to the note register 60. The F number generator 50 calculates the phase of the generated sound and sends the phase data to the note register 60.

The note register 60 stores data from the waveform calculator 40 and is read by the phase data from the F number generator 50. The read waveform data is DA-converted by the DAC 70, an envelope is added, an analog signal is amplified by the amplifier 80, and is sounded from the speaker.

The block 100, which is the gist of the present invention, will now be described.
In FIG. 1, the temperament transposition switch 110 is composed of the temperament selection switch and the transposition control switch shown in FIG. 2, and the transposition control switch is composed of a KFY selection switch and a REAL selection switch. With the KEY selection switch, the key of the music to be played is arbitrarily selected, and thereby the fundamental tone and the change in pitch in the key of the music to be played are arbitrarily selected. The REAL selection switch arbitrarily selects the pitch (pitch) of all the musical tones produced in response to the depressed key, independently of the selection of the pitch change by the KEY selection switch.

The temperament transposition control 120 calculates the difference between the KEY selection switch and the REAL selection switch. At this time, C to H are the following numbers.

Table 1 shows these calculated values.

The number of this difference is sent to the key assigner 20, and is added to or subtracted from the key data representing the depressed key. The added and subtracted numeric key numbers are sent to an F number generator 50 which determines the frequency of the sound to be produced. The F-number generator 50 sends this key number to the F-number memory control 130 to calculate the frequency number. On the other hand, the temperament transposition control 120 sends the information of the temperament selection switch as a temperament address and the information of the KEY selection switch as a key address to the F number memory control 130. The F number memory control 130 sends the above data to the F number memory 140 as an F number memory address. The address of the F number memory is shown below. It consists of a 14-bit address and contains the temperament address (T0-T
2) 3 bits key number (KN0 to KN5) 6 bits, key address (TP0 to TP3) 4 bits H / L selection 1 bit. The contents of the F number memory 140 are shown in FIG.

Here, EQU is equal temperament, PURE is just temperament, PYTHA is Pythagoras temperament, MEANG ^# is middle and whole temperament G ^# , WERCK3 is Werckmeister third method, and each temperament is memorized. It also has an external memory area. These are selected by the temperament selection switch shown in FIG. One temperament consists of areas corresponding to the key numbers (1 to 61) of C2 to C7, and the area of one key number consists of key data of C to H. Furthermore, one key data consists of a 2-byte frequency number.

As shown in Table 2, the frequency number represents each key on the horizontal axis, and this key data represents the pitch when each key is tuned to C to H, and the unit is expressed in cents.

For example, when the key number is C2 and the key number is C2, the horizontal axis 0 represents the tuning of C tone, which is 0 cent with respect to C2. Next, the horizontal axis 1 is C ^# -tuned tuning, where C ^# 2 is 0 cent and C2 is 1088-1200 cent (in Table 2, the symbol ▲ represents -1200).

Similarly, the tuning of D to H is entered from 2 to B on the horizontal axis. Key numbers are 1 to 61 on the vertical axis
(Not displayed.) There is a scale for the horizontal axis.

It should be noted that in Table 2, the 0 cent display indicates the fundamental tone of each key, and therefore, the same 0 cent does not match.

As can be seen from the above description, the reading method of the F number memory 140 determines the key of the horizontal axis in Table 2 by the key address which is the information of the KEY selection switch. From this, the fundamental tone in the key is selected. Next, the key number, which is the number obtained by adding or subtracting the number in Table 1 to the key data of the pressed key, becomes the vertical axis, and the read address is determined. As a result, the pitch (pitch) selected by the KEY selection switch and the pitch (pitch) selected by the selected REAL
The pitch (pitch) is selected according to the difference between

In this way, first determine how many times to move with KEY-REAL, calculate with key data, determine the key number, and determine the key with the KEY selection switch, so there are two types of switches, KEY and REAL. By setting, you can freely transpose even in temperaments other than equal temperament,
Moreover, it is possible to independently realize an arbitrary fundamental tone and an arbitrary pitch change amount for transposing each musical tone played by each key of the keyboard.

In the present invention, since the external memory 150 and the external memory control 160 shown in FIG. 1 can be connected and the temperament data can be externally added to the external memory area (see FIG. 3) of the F number memory 140, this area If it is configured with RAM, it will be an extremely expandable system.

The present invention has been described with two types of the KEY selection switch and the REAL selection switch, but it is also possible to switch and use the same switch.

Furthermore, although the present invention has been described with an F-number system, this is an example and not a limitation.

The embodiments of the present invention are as follows. The first selecting means for selecting the key of the music to be played, the second selecting means for selecting the key of the sound to be played, and the difference between the data from the first selecting means and the data from the second selecting means First computing means for computing, a key data generator for producing key data indicating a depressed key, key data from the key data generator and data from the first computing means An electronic musical instrument characterized in that the second arithmetic means, the frequency number memory means for storing the frequency number, and the frequency number memory means are read by the data from the first selecting means and the second arithmetic means. Transposing device.

[Brief description of drawings]

FIG. 1 is a block diagram of an embodiment showing the whole of the present invention, FIG. 2 is a diagram of a switch for selecting a temperament and a switch for controlling transposition, and FIG. 3 is a map of the contents of the F number memory. 10 …… Keyboard tablet, 20 …… Key assigner. 30 …… Envelope generator, 40 …… Waveform calculator, 50 …… F number generator, 60 …… Note register, 70 …… DA converter, 11
0 …… Tone intonation switch, 120 …… Tone intonation control, 130 …… F number memory control, 140 …… F
Number memory, 150 …… External memory, 160 …… External memory control.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yoichi Nagashima 200 Terashimacho Hamamatsu City, Shizuoka Prefecture Kawai Musical Instrument Co., Ltd. In-house (72) Masafumi Mizoguchi, 200 Terashima-cho, Hamamatsu-shi, Shizuoka, Kawai Musical Instrument Mfg. Co., Ltd. Document JP-A-60-41094 (JP, A)

Claims (2)

[Claims] 1. A key data generating means for generating key data indicating a depressed key, and (B) a freely selectable fundamental tone in a key of a tune played in response to the depressed key. 1) and (C) independently of the selection by the first selecting means, the pitch of the fundamental tone selected by the first selecting means is set to the pitch of the fundamental tone of an arbitrary tone to be generated. Second selection means to be set; (D) frequency information storage means for storing a plurality of frequency information; (E) key data from the key data generation means and the first
Reading means for reading the frequency information storage means based on the fundamental tone in the key selected by the selecting means and the pitch in the key selected by the second selecting means; and (F) the reading means. A transposing device for an electronic musical instrument, comprising: a musical tone generating means for generating a musical tone having a frequency corresponding to a transposed desired temperament based on the read frequency information. 2. The transposing device of the electronic musical instrument further comprises (G)
It is provided with a temperament selecting means for selecting an arbitrary temperament from a plurality of kinds of temperament, and the reading means reads the frequency information storage means also based on the temperament selected by the temperament selecting means. The electronic musical instrument transposing device according to claim 1.