JPS61172193A - Electronic musical instrument - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a two-electronic musical instrument that transposes the pitch corresponding to each key of the keyboard section by operating the keyboard section.

[Background technology] In the case of keyboard instruments, the keyboard section on which performance is operated is set to the key of C based on the white keys, and by also using the black keys, it is possible to freely perform between various types. This is what I try to do. However, using the black keys in combination is a very difficult performance operation, especially for beginners, and it is extremely difficult to freely play and enjoy pieces outside the C scale. Therefore, no matter what tone the song is in, if it can be played using the most basic white keys, the keyboard instrument can be used by a wider range of people.
This allows you to enjoy playing very easily.

In consideration of these points, various attempts have been made to enable transposition control in electronic musical instruments. For example, Japanese Patent Publication No. 51-21564, Utility Model Publication No. 52-84
In the device disclosed in Japanese Patent No. 32, etc., a key is selected by selecting a switch, and a performance sound corresponding to the selected key is obtained. However, with such means, the correspondence between key selection and keyboard is not clear, and operability is poor, especially for beginners. Also, in order to make this clear, for example, as shown in Japanese Utility Model Publication No. 50-22023, a switch group consisting of a large number of switches corresponding to all the keys to be selected should be provided on the panel surface. is considered.

However, this requires the use of a large amount of the limited panel area of the electronic musical instrument, places significant restrictions on other operating mechanisms, and is also extremely disadvantageous in terms of cost. Become.

[Problems to be Solved by the Invention] This invention was made in view of the above points, and key selection is performed using a normal keyboard section without providing a switch for selecting a key. It is an object of the present invention to provide a transposition-controlled electronic musical instrument whose structure is simplified and whose operability is sufficiently improved.

[Means for Solving the Problems] That is, the electronic musical instrument according to the present invention has transposition control that detects an operation key when setting the transposition and generates key information corresponding to the key to be set in response to the operation key. The apparatus is equipped with a means for setting pitches generated in response to operations of eight keys on a keyboard section based on the key information.

[Function] The transposing device for an electronic musical instrument configured as described above is set so that key information corresponding to the key to be set is output by key operation in the transposing setting state. , When this key information is set, the tone, -, of the sound source signal generated in response to the performance operation of the keyboard section is automatically set to be transposed. In other words, transposition setting control is performed using the keyboard section that normally exists in keyboard instruments, and in this key setting state, transposition can be performed by operating the white key corresponding to the normal key of C. For example, even beginners can easily enjoy transposed performances.

[Embodiments of the invention] Hereinafter, one embodiment of the present invention will be described with reference to the drawings.

FIG. 1 shows its configuration, in which a key switch circuit 11 is driven in response to key operations on the keyboard. A switch signal can be obtained. The key switch signal obtained from the key switch circuit 11 is supplied to the pitch information generation circuit 12 and the transposition control circuit 13.
4, the pitch information generating circuit 1 detects the key switch signal and generates a transposition information signal corresponding to the pitch name of the key.
Supply to 2. This pitch information generation circuit 12 sets pitch signals KV expressed in voltage values corresponding to eight keys based on the supplied transposition information signal. is selected and output, and the voltage controlled variable frequency oscillator 15 (hereinafter abbreviated as vCO)
is driven and controlled to generate a sound source signal having a pitch frequency corresponding to the pitch signal KV. The sound source signal generated by this V CO 15 is then passed through a voltage controlled variable filter 16 (
A voltage controlled variable gain amplifier 17 (hereinafter abbreviated as VCA) controls the opening and closing envelope to output the tone, and outputs it via an amplifier 18 to a speaker 1.
9 to produce the sound as a performance sound.

In this case, the envelope waveform signals from the envelope generators 20 and 21 are supplied as control signals to the VCF 1B and VCA 17, and the envelope waveform signals from the pitch information generation circuit 12 are supplied to the envelope generators 20 and 21. , provides a keying signal KON corresponding to the key switch signal. The envelope generators 20 and 21 generate a waveform signal that rises in response to a key operation and is set by condition signals for shaping the waveform such as a rise time constant, sustain level, and decay time constant from the control voltage circuit 22. generate.

That is, in V CF 1B, the cutoff frequency is modulated in accordance with the control envelope waveform, and this V CF 1
The VCA 17 controls the amplification gain and sets the opening/closing of the output musical tone signal and the volume envelope.

Here, the pitch signal is level-controlled and supplied to the V CF 1B, so that timbre control that is perceptibly uniform over the entire tone range is performed.

FIG. 2 particularly shows the pitch information generation circuit 12 and the transposition control circuit 13 in detail. It consists of...

These key switches S1, G2, ... are connected in series so as to sequentially connect a normally closed fixed terminal and a movable terminal, and are designed to supply information "1" to one end. ing. For example, the treble side is prioritized and selected in correspondence with the operating key, and an output signal "1" is taken out from the fixed terminal on the normally open side of the corresponding key switch.

In this case, the key switches S1, G2, . . . are set over the first to third octaves, and the normally open side fixed terminals of the key switches S1, G2, . A gate circuit 01 corresponding to each pitch name of C, D, . . .
~G12 as gate signals.

In addition, the key switches SL, S2, .
They are respectively supplied to C as gate signals, and are combined together via a diode and taken out as a keying signal KON via a waveform shaping circuit 23.

The gate circuits 01 to G12 include a plurality of resistors r connected in series, a resistor R connected between the resistors r, and a resistor R.
The reference voltage to be divided is supplied via the high input impedance buffer amplifier 24.

That is, key switches SL, G2, . . .
When one of the key switches is driven, a gate signal is applied to the gate circuit of the pitch name corresponding to the driven key switch, and a voltage signal corresponding to the pitch name is extracted. This voltage signal is further supplied to the gate circuits GA to GC through a high input impedance buffer amplifier 25 in an octave relationship through a voltage divider circuit made up of resistors R and 2R, and output signals from the gate circuits GA to GC. , high input impedance buffer amplifier 2
6 as a pitch signal KV.

The signals for each pitch name supplied to the gate circuits G1, G2, . . .
...is supplied to each, and its differential output is sent to the AND circuit H.
a, 28b, . The AND circuits 28a, 28b, . . . are supplied with the set output signal of the flip-flop circuit 29 as a gate signal. is set. And AND circuits 28a and 28b.

. . is detected by the OR circuit 31, the flip-flop circuit 29 is reset-controlled by the delay circuit 32.

The output signals from the AND circuits 28a, 128b, . . . are output from the flip-flop circuits Ha s 3:
(b.

... as a set signal, and the set output signal of the flip-flop circuits 33a, 33b, ... is supplied to the gate circuit GOI corresponding to each of the first part scale names.
~G012 as a gate signal. This gate circuit Got-GO12 is supplied with a divided voltage signal corresponding to a one-part scale by the resistors r, R, and R of the power supply E1, and the output voltage signals from the gate circuits GOI to G012 are as described above. The input impedance is supplied to the buffer amplifier 24.

And the flip-flop circuits 33a and 33b
.

... are reset by the output signal of the differentiating circuit 30 when the set switch 14 is turned on.

That is, in the apparatus configured as described above, when the transposition set switch 14 is turned on, the flip-flop circuit 29 is set by the output signal from the differentiating circuit 30, and the flip-flop circuits 33a133b1... are reset, and the transposition is performed. It is considered to be the setting mode. If, for example, the key switch S2 is driven by key operation in this state, C#
An output signal is now generated in the differentiating circuit 27 corresponding to the flip-flop circuit H via the AND circuit 28b.
b is set to open the gate of gate circuit GO2.

Therefore, a transposition information signal corresponding to C# is obtained from this gate circuit GO2, and this transposition information signal is transmitted to the amplifier 24.
The reference voltage is taken out via the pitch information generating circuit 12 and used as a reference voltage for the voltage dividing circuit of the pitch information generating circuit 12.

That is, the flip-flop circuit 33a133b1
... acts as a key information storage means, and in the transposition setting mode, when a predetermined period of time has elapsed from the key press operation and the key information has been stored and set in the storage means, the delay is activated. The flip-flop circuit 29 is reset by the output signal from the circuit 32, thereby switching from the transposition setting mode to the performance mode.
I'm going to growl.

In this state, the key switch Sl,
When any one of S2,... is driven, a pitch name information signal obtained by dividing the reference voltage corresponding to the pitch name of that key switch is extracted and converted into a corresponding octave voltage in the gate circuits GA to GC. Then, the pitch signal KV is extracted from the amplifier 2B.

That is, the gate circuit G1-G of the pitch information generation circuit 12
The signal taken out from the 12th section is set as a reference by the gate circuit Got-GO 12 when the transposition is set, and the transposition is controlled by a key operation when the transposition is set.

Further, in the above embodiment, the output voltage from the transposition control circuit is 1
The output voltage was divided into voltages corresponding to two note names, and the output voltage was divided into voltages corresponding to octaves, and the resulting output voltage was led to a voltage-controlled oscillator to control the oscillation frequency. However, the arrangement order of these voltage dividing circuits can be changed as appropriate. That is, as long as the voltage dividing circuits related to transposition control and the voltage dividing circuits corresponding to the 12 note names are connected in series, the arrangement order does not matter.

Furthermore, in the above embodiment, the pitch is set using a voltage signal, but this also applies when a sound source oscillator is used and frequency-divided to form a sound source signal corresponding to each pitch. can also be implemented in the same way.

FIG. 3 shows an example of such a case, in which the transposition control circuit 35 includes a reference oscillator 3B;
The oscillation signal from B is divided by an octave frequency dividing circuit 37,
One of the note names between the octaves is selected by a key switch signal from the key switch circuit 11, and a frequency-divided signal corresponding to the selected note name is extracted as a reference sound source signal. This reference sound source signal is then supplied to the octave frequency divider circuit 39 of the sound source circuit 38, and the 1-part scale frequency-divided signal is further sequentially divided by the 1-part 2-frequency divider circuit, and the opening/closing circuit generates a sound source signal corresponding to the 8 keys. Supply 40. The opening/closing circuit 40 is controlled by the key switch circuit 11 to open/close the sound source signal corresponding to the operating key.

This opened/closed sound source signal is appropriately formed into a timbre by a timbre forming circuit 41, and guided to a speaker 43 via an amplifier 42, where it is produced as a performance sound.

FIG. 4 shows the key switch circuit 11 and the transposition control circuit 3.
5 is shown in more detail, each key switch S1, S2,... of the key switch circuit 11 outputs a signal of "1" when operated, and outputs a corresponding sound source signal. For derivation, it is guided to the switching circuit 40 section. And this key switch SL.

The signals during the operation of S2, .
.

. . and guided to the transposition control circuit 35.

The transposition control circuit 35 is configured in substantially the same manner as the transposition control circuit 13 of the previous embodiment, and includes OR circuits 45a145b1 and 45a145b1.
Differentiating circuit 27a - 27b s...
is detected by the flip-flop circuits 33a, 33b, . . . via the AND circuits 28a, 28b, .
. . , and gate-controls the gate circuit Got-GO12. Components that are the same as those in FIG. 2 are designated by the same reference numerals and their explanations will be omitted.

The gate circuit GOI-GO12 is supplied with the frequency-divided output signals of CSC, . . . This is taken out as a reference sound source signal for the octave frequency divider circuit 39 of the sound source circuit 38 and transposed.

[Effects of the Invention] As described above, according to the transposing device of the present invention, when performing a transposed performance, the key of the key to be transposed can be changed simply by turning on the transposing set switch and then operating the key of the key to be transposed. This allows settings to be made, and by performing a normal performance using the white keys, the transposed performance will be expressed. In other words, the transposition settings of the instrument can be controlled by the keyboard section used for normal performance, without complicating the panel system of the electronic musical instrument.
Moreover, by making the operability very simple, transposition control can be easily executed even during a performance, and the effect is remarkable.

[Brief explanation of the drawing]

FIG. 1 is a block diagram illustrating a transposition control device according to an embodiment of the present invention, FIG. 2 is a circuit diagram showing the above embodiment in detail, and FIG. 3 is a block diagram illustrating another embodiment of the present invention. FIG. 4 is a circuit diagram showing the main parts of the same embodiment in detail. DESCRIPTION OF SYMBOLS 11... Key switch circuit, 12... Pitch information generation circuit, 13.35... Transposition control circuit, 14... Transposition set switch, 38... Sound source circuit, 40... Opening/closing circuit. Applicant's representative Patent attorney Takehiko Suzue District 1

Claims (2)

[Claims] (1) a) means for generating key information representing the key to be set in response to key operations on the keyboard; b) a transposition setting switch for selecting and specifying a transposition setting mode; c) storage means; d) means for storing and setting key information corresponding to the operation key of the keyboard section in the storage means when the transposition setting mode is selected by the switch, and e) the key information stored in the storage means. An electronic musical instrument characterized in that a generated musical tone is transposed and controlled according to key information. (2) a) means for generating key information representing the key to be set in response to key operations on the keyboard; b) a transposition setting switch for selecting and specifying a transposition setting mode; c) storage means; d) means for storing and setting key information corresponding to the operating key of the keyboard section in the storage means when the transposition setting mode is selected by the switch; e) means for storing and setting the key information corresponding to the operating key of the keyboard section in the storage means; Based on the key information stored in
means for setting the pitch of a musical tone generated in response to a key operation on the keyboard section; f) after the key information is stored in the storage means by the storage setting means, from the transposition mode; An electronic musical instrument comprising means for switching to the performance mode described above.