JPS6233595B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electronic musical instrument equipped with an automatic accompaniment device that specifies accompaniment tones through key operations.

It has been considered to provide an automatic performance device that is combined with an electronic musical instrument and automatically plays rhythm accompaniment sounds such as chord chords and bass sounds. The accompaniment tones played by this automatic accompaniment device are set in correspondence with the melody of the performance piece, and are instructed using a keyboard section while the performance tones are being played.

That is, in the keyboard section of an electronic musical instrument, the keys constituting a chord corresponding to an accompaniment note are operated, and the key corresponding to the root note of that chord is operated, and the pressed key information is memorized. This system continuously generates accompaniment musical tone signals for chord chords and bass notes corresponding to the memorized pitch information even after the key is released. Automatic accompaniment tone is created by opening and closing these musical tone signals in response to rhythm pulses. This is what you get.
Then, each time the keyboard section is operated, the stored pitch information in the storage section is converted, and the accompaniment that matches the performance piece is continued.

However, with this configuration, the pitch information stored in the storage device that sets the accompaniment sound is converted in response to each key press on the keyboard. For example, it is not possible to perform melody performances other than accompaniment tone settings in the section. Therefore, in reality, it becomes necessary to divide the keyboard area of the keyboard section into one for playing the melody and one for setting accompaniment sounds, and the entire keyboard area cannot be used effectively. This is a big problem, especially in electronic musical instruments with a single keyboard where the number of keys is limited.

This invention has been made in view of the above points, and is an automatic accompaniment that allows the keyboard section to be effectively shared for melody performance and accompaniment sound setting, and allows effective use of all keys. The device is intended to provide an electronic musical instrument equipped with a key touch detection mechanism that detects a specific touch operation of a key on a keyboard section, and detects and stores information about the key press at that time based on the detection signal. This is intended to be used for accompaniment sound generation control.

An embodiment of the present invention will be described below with reference to the drawings. Figure 1 shows its configuration, with keyboard 1
1 generates key press information in response to the key press operation, controls the opening/closing circuit 12, and opens/closes a sound source signal corresponding to the operated key from the sound source circuit 13. The sound source signal derived from this opening/closing circuit 12 is suitably shaped into a tone by a tone filter 14 and taken out as a musical tone signal.The sound source signal is then led to an amplification and speaker circuit (not shown in the figure), which produces a performance sound corresponding to key operations on the keyboard 11. will now occur.

Further, key press information from the keyboard 11 is also supplied to the storage device 15 as write information. This storage device 15 is given a write command by a touch detection signal from a key touch detection mechanism 16, and this key touch detection mechanism 16
For example, when a key is pressed down deeper than a certain value,
Alternatively, the device detects a specified key touch state, such as when the key is moved laterally, and may be configured as shown in FIG. 2, including the storage device 15, for example. That is, a shutter plate 17 is provided corresponding to each key of the keyboard 11 that moves downward as a unit when the key is operated, and the light from the light source 19 is transmitted through the through hole 18 provided in the shutter plate 17. The light is made to enter the light receiving element 20 such as the like. When the key is pressed down to a certain value or more, the light receiving element 20
The amount of incident light increases, and a large voltage signal is given to the comparator 21.
The comparator 21 compares it with a set voltage Vre, and when the voltage value from the light receiving element 20 exceeds Vre, it generates an output signal, and the one shot circuit 22 generates a pulsed detection signal. That is, when the key is pressed down beyond a specific value, a one-shot pulse-shaped key touch detection signal is obtained.

The storage device 15 also includes AND circuits 23a, 23b, . . . to which key press information from the keyboard 11 corresponding to pitches of C, C#, . The touch detection signal from the one-shot circuit 22 is supplied as a gate signal. This AND circuit 23a,
The output signals from 23b... are OR circuits 24a, 2
4b... to the data input terminals of trigger flip-flops 25a, 25b, .
...and output information corresponding to the pitch of B, and AND circuits 26a and 2, respectively.
6b... to the OR circuits 24a, 24b... The output signal of the one-shot circuit 22 is inverted by an inverter 27, and this signal is supplied as a gate signal to the AND circuits 26a, 26b, .

That is, if, for example, the C key is depressed more deeply on the keyboard 11, the amount of light received by the light receiving element 20 increases due to the lowering of the shutter plate 17, an output signal is obtained from the comparator 21, and a one shot pulse is generated. Output. At this time, storage device 1
5 is supplied with the pitch information of C due to the operation of the C key, "1" is written to the flip-flop 25a via the AND circuit 23a whose gate is opened by a one-shot pulse, and this storage device 15, information on pitch C will be output. After the one shot pulse falls, the AND circuit 23a is replaced by the AND circuit 26.
Since the gate of the flip-flop 25a is opened, the information "1" stored in the flip-flop 25a is fed back and stored during the clock, and the pitch information C is stored and outputted in the storage device 15.

Furthermore, when the key of the keyboard 11, for example, pitch E, is operated deeply, the one-shot circuit 22
One shot pulse is output from. Therefore, since the output of the inverter 27 becomes "0" at this time, the gate of the AND circuit 26a is closed, and since the pitch information of C does not exist, the pitch information C is deleted from memory. At the same time, pitch information E is stored in the circuit section for pitch E in the same manner as described above.

Here, in the storage device 15, when three keys constituting a chord are operated simultaneously on the keyboard 11, the information on the three keys is stored and output at the same time, and the chord chord can be played with one finger. When only the root note of is specified, only the pitch information of that one root note is stored and output.

The readout signal of the pitch information stored in the storage device 15 in this manner is supplied to the chord tone generation circuit 28 and the root note detection circuit 29. Here, the chord sound generation circuit 28 and the root note detection circuit 29 are supplied with a command signal from a performance state selection changeover switch 30, and this switch 30 selects the side "1F '', three tone source signals having one pitch information read from the storage device 15 as the root tone are taken out from the chord tone generating circuit 28. For example, when the switch 30 is on the "1F" side, the storage device 15
Assuming that the pitch information of C is obtained from the chord tone generating circuit 28, the chord tone generating circuit 28 generates tone source signals of pitches of chord chord constituent tones C, E, and G having C as the root tone. Furthermore, in the root note detection circuit 29, since the signal from the storage device 15 is the root note, it passes through as it is and is supplied to the base note generation circuit 31, and is set in the relationship of 1st and 5th with respect to the root note. Generate a certain bass sound signal. As described above, when the root tone signal is C, C and G base tone signals are obtained.

Furthermore, when the switch 30 is on the three-finger "3F" side, the chord chord itself is played on the keyboard 11, and the bass sound generation circuit 28 plays the three fingers corresponding to the pitch information read from the storage device 15. Generates a sound source signal. The root note detection circuit 29 detects a root note from the combination of the three pitch information from the storage device 15 and gives a command to the bass note generation circuit 31.

Chord sound generation circuit 28 obtained in this way
The chord chord signals are collectively sent to the gate circuit 32.
The 1st and 5th bass sound signals from the bass sound generation circuit 31 are sent to gate circuits 33a and 3, respectively.
3b, and this gate circuit 32, 33a, 3
3b is gate-controlled by the code rhythm pulse and base rhythm pulse from the rhythm pulse generation circuit 34. The output signals from the gate circuits 32, 33a, and 33b are passed through tone filters 3 for chord chords and bass notes, respectively.
5 and 36 to form a tone, and similarly to the performance musical tones, the tones are led to an amplification section and a speaker circuit section, and are produced as accompaniment tones.

That is, according to the electronic musical instrument configured as described above, when a normal performance operation is performed on the keyboard 11, a performance sound corresponding to the key operation is obtained via the opening/closing circuit 12, and a normal melody performance, for example, is obtained. be done.
At the same time, if a specified key is touched on the keyboard 11, for example, by operating it particularly strongly, this is detected by the key touch detection mechanism 16, and the key press information is written into the storage device 15 every time the key is touched. . That is, a chord chord and a bass tone corresponding to the pitch of the specifically operated key are generated, and are sounded in accordance with the rhythm pulse, so that an automatic accompaniment performance sound can be obtained.
When the automatic accompaniment is to be terminated, the pulses derived from the rhythm pulse generation circuit 34 may be cut off by a stop switch or a switch (not shown) operated by an operation button provided on a clapper or the like.

By doing so, the accompaniment tones of the automatic accompaniment device can be specified while playing melodies and the like while sharing the same keyboard 11, and the keyboard 11 can be used effectively. However, if this is done as it is, performance sounds can also be obtained at the same time by key operations for specifying accompaniment sounds on the keyboard 11 section. Figure 3 shows an example of a case where the operation keys for specifying accompaniment sounds are prevented from producing sounds; in this case, performance sounds corresponding to melody sounds can be selected with priority and produced. It is something.

That is, the sound source signal from the sound source circuit 13 is
and is supplied in parallel to the second switching circuits 12a and 12b, so that the second switching circuit 12b opens and closes the sound source signal corresponding to the operating key of the keyboard 11. Furthermore, when multiple keys are operated simultaneously on the keyboard 11, a treble tone priority selection circuit 37 is provided that detects only key press information corresponding to the highest note, and a signal from this circuit 37 activates the first opening/closing circuit 12a. Let it be controlled. The output sound source signals from the first and second switching circuits 12a and 12b are taken out via gate circuits 38a and 38b, respectively, and guided to the tone filter 14.
A switch 39 is appropriately provided in the circuit a. The gate circuits 38a and 38b are supplied with gate signals reciprocally when the flip-flop circuit 40 is set and reset. It is reset by the output of the post-fall delay circuit 41. Other components that are the same as those in FIG. 1 are given the same reference numerals and their explanations will be omitted.

That is, if configured as described above, the keyboard 11
Since there is no detection signal from the key touch detection mechanism 16 in the normal operation state of the flip-flop circuit 40, the flip-flop circuit 40 is in a reset state and the gate circuit 38 is in a reset state.
b is opened, and the sound source signal corresponding to the key operation taken out from the second opening/closing circuit 12b is guided to the tone filter 14 and is produced as a performance sound. On the other hand, when a specific touch operation for designating an accompaniment tone is performed on the keyboard 11, the flip-flop circuit 40 is set by a detection signal from the key touch detection mechanism 16, the gate circuit 38b is closed, and the gate circuit 38a is closed. be opened. At this time, on the keyboard 11, the key for playing the melody is operated simultaneously with the key for specifying the accompaniment tone, and the key for playing the melody is usually on the higher pitch side than the key for specifying the accompaniment tone. Therefore, the treble priority selection circuit 37 selects only the key press information corresponding to the melody, gives a command to the opening/closing circuit 12a, and derives the melody sound source signal.
It comes to be taken out via the gate circuit 38a.
Therefore, if switch 39 is set to ON, accompaniment sound specification operation can be performed on keyboard 1 along with melody performance.
By performing step 1, along with accompaniment sound specification control,
This allows selective sound generation control of only melody sounds. In this case, although it is omitted in the figure, key press information for melody performance is stored in the storage device 1.
It is preferable not to supply it to 5. Further, it is desirable that the touch detection signal from the key touch detection mechanism 16 continues while the accompaniment tone designation key is being operated.

The above embodiment shows a case where the entire area of the keyboard 11 is used for normal performance and for specifying accompaniment sounds,
Although the case is particularly suitable for an electronic musical instrument with a single keyboard, for example, if the musical instrument has upper and lower keyboards, the portion commonly used for specifying accompaniment sounds may be divided and specified depending on the key range.

That is, as shown in FIG. 4, in the high range part of the upper keyboard where melody performances are mainly performed, the first opening/closing circuit 12a is directly controlled in response to the key operation, and the performance sound corresponding to the key operation is directly played. Allow it to be taken out. On the other hand, keyboard 11
For example, a signal corresponding to a key operation in the low range on the lower hand keyboard, which also shares the accompaniment sound designation, is supplied to the second opening/closing circuit 12b, and the sound source signal taken out from this opening/closing circuit 12b is taken out via the gate circuit 38. Do it like this. This gate circuit 38 is a flip-flop circuit 40 similar to that shown in FIG.
The gate is opened in the reset state, and when there is a detection signal from the key touch detection mechanism 16 for the accompaniment sound designation operation, the sound source signal from the opening/closing circuit 12b is cut off, and the performance sound of the key press information by the accompaniment sound designation operation is Make it unpronounced.

As described above, according to the electronic musical instrument according to the present invention, the keys of the keyboard section, which exist only in a limited range, can be effectively used not only for normal performance operations but also for specifying accompaniment sounds to an automatic accompaniment device. Therefore, automatic accompaniment control can be effectively executed without impairing the performance performance of the electronic musical instrument.

[Brief explanation of the drawing]

FIG. 1 is a configuration diagram illustrating an electronic musical instrument according to an embodiment of the present invention, FIG. 2 is a diagram showing an extracted key touch detection and storage section in the above embodiment, and FIGS. FIG. 7 is a diagram showing another embodiment of the invention. 11...Keyboard, 12, 12a, 12b...Opening/closing circuit, 13...Sound source circuit, 15...Storage device, 1
6... Key touch detection mechanism, 28... Chord sound generation circuit, 29... Root note detection circuit, 31... Bass sound generation circuit, 34... Rhythm pulse generation circuit.

Claims (1)

[Scope of Claims] 1. A keyboard section for performing musical performance operations, means for generating musical tones corresponding to musical performance operations on the keyboard section, means for detecting specified key touch operations on the keyboard section, and means for detecting specified key touch operations on the keyboard section; a storage device for detecting and storing key depression information at that time in response to a detection signal of the detection means; a means for generating an accompaniment sound signal corresponding to the key depression information stored in the storage device; An electronic musical instrument equipped with an automatic accompaniment device, characterized in that the electronic musical instrument is equipped with means for producing accompaniment tones based on a musical tone signal in accordance with a rhythm. 2. A circuit for prioritizing the highest tone selection of the operating key corresponding to the performance operation of the keyboard section is provided, and only the performance sound corresponding to the operating key selected by the priority selection circuit is produced based on the detection signal of the key touch detection means. An electronic musical instrument as claimed in claim 1.