JPS644155Y2 - - Google Patents

Description

[Detailed Description of the Invention] Technical Field This invention relates to a touch response device for an electronic musical instrument, and particularly relates to a multitone electronic musical instrument in which touch control can be performed independently for each note using a common touch sensor for each key. .

Prior Art In order to perform touch control independently for each key in a multitone electronic musical instrument, it is most common to provide a separate touch sensor for each key, but this increases the cost and is not suitable for low-priced models. It was hot. On the other hand, Japanese Patent Publication No. 55-41437 discloses that a common key press operation detection device (touch sensor) is provided for each key, and the output of this common touch sensor is selected by a gate provided for each key. It is shown that a touch detection signal for each key can be obtained by This method allows the number of touch sensors to be reduced to one, but requires a gate for each key to selectively derive its output and an associated preconditioner for each key. It was complicated and costly.

Purpose of the invention The purpose of this invention is to enable independent touch control of each note at low cost in a multitone electronic musical instrument using touch detection means common to multiple keys.

Summary of the invention The electronic musical instrument according to this invention includes a keyboard comprising a plurality of keys for selecting musical tones, an assignment means for assigning the sound of a key pressed on the keyboard to one of a specific number of channels, and musical tone generating means for generating musical tones in each channel according to the assignment; sampling signal generating means for generating a sampling signal in response to the pressing of a key on the keyboard; and a sampling signal generating means provided commonly to a plurality of keys on the keyboard; a touch detection means for outputting a touch detection signal corresponding to the touch of a pressed key; a sampling means for sampling the touch detection signal in accordance with a sampling signal output from the sampling signal generation means; and a sampled touch detection signal. storage means for storing keys corresponding to the touch detection signals in correspondence with channels to which keys are assigned; It is designed to control the musical tone of the channel.

Touch detection means for outputting a touch detection signal corresponding to the touch of a pressed key is provided in common for a plurality of keys, and on the other hand, it generates a sampling signal in response to the pressing of a key on the keyboard, and outputs a touch detection signal corresponding to the touch of a pressed key. The touch detection signal is sampled according to the following. As a result, the touch detection signal corresponding to the touch of each pressed key is detected by the common touch detection means, and the sampling signal generated corresponding to the touch of each key is detected. A touch detection signal corresponding to each pressed key is sampled based on the signal. Each sampled touch detection signal is stored in the storage means in correspondence with a channel to which a key corresponding to the touch detection signal is assigned. Therefore, there is no need to separately provide touch detection means for each key, resulting in a simple configuration and low cost.

Embodiment Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

In FIG. 1, the key press detection circuit 11
0 is detected, and a sound generation assignment circuit 12 allocates the sound of the pressed key to one of a specific number of musical sound generation channels based on the output of the pressed key detection circuit 11. The musical tone generation circuit 13 is capable of independently generating and controlling musical tone signals for each of the specified number of channels (hereinafter referred to as N), and the output musical tone signal is sent to the sound system 14.
given to. The sound generation assignment circuit 12 generates a key code KC indicating the key assigned to each channel and a key-on signal indicating whether or not the key is continuously pressed.
KON and time-division output for each channel.
The musical tone generation circuit 13 generates musical tone signals for each channel (for example, digitally) based on the key code KC given in a time-division manner.

The key-on rising edge detection circuit 15 detects the start point of pressing the key assigned to each channel, and differentiates the key-on signal KON of each channel given in a time-division manner for each channel time slot to detect the rising edge of the signal KON. It is designed to output a synchronized key-on pulse KONP.
The envelope generator 16 generates a key-on signal KON and a key-on pulse KONP given in a time-division manner.
Based on this, an envelope signal is generated (eg, digitally) in a time-division manner for each channel.
It is assumed that the rise point of the envelope signal is determined by the key-on pulse KONP. This envelope signal is applied to the tone generating circuit 13 via the multiplier 17.

Touch sensor 1 provided in relation to keyboard 10
Reference numeral 8 is common to each key, and produces an analog output in response to a key touch, such as the pressing speed or pressing force of the pressed key. Therefore, no matter which key is pressed, an analog touch detection signal corresponding to the key touch at that time is outputted to one output line 19. The output signal of the touch sensor 18 is converted into a digital signal by an analog/digital converter 20 and applied to the A input of the selector 21. The N-stage shift registers 22, which have the same number of channels, are used to store touch detection signals corresponding to the keys assigned to each channel, and are shifted in synchronization with the channel time division timing according to the clock pulse φ. controlled. The output of the shift register 22 is given to the B input of the selector 21. The key-on pulse KONP output from the key-on rise detection circuit 15 is applied to the A selection input SA of the selector 21, and its inverted signal is applied to the B selection input SB. The output of the selector 21 is input to the shift register 22. In this way, by the key-on pulse KONP generated at the beginning of pressing the key assigned to each channel, the touch detection signal corresponding to the key touch (initial touch) at the beginning of pressing the key is sampled via the A input of the selector 21. and stored in the shift register 22 at the corresponding channel timing. The key touch detection signals of each channel stored in this way are thereafter cyclically held via the B input of the selector 21. In this way, key touch detection signals unique to each key assigned to each channel are stored in the shift register 22, respectively. The key touch detection signal of each channel output from the shift register 22 in a time-division manner is given to the musical tone generation circuit 13,
It is used to control the volume, pitch, timbre, etc. of musical tones generated in the corresponding channel. Also,
It is also provided to the multiplier 17 and used to control the level of the envelope signal in accordance with the touch of the key.

As an example of the touch sensor 18, it is preferable to use one that generates a differential output signal having a level depending on the pressing speed or strength when a key is pressed down. To this end, it is conceivable to configure the touch sensor 18 using a mechanism such as a piano's action mechanism, as shown in FIG. An actuator 24 provided below the key 23 is provided for each key, but only one hammer 25 moved by the actuator 24 is provided for each key.
A transducer 26 is fixed at a position to be struck by a hammer 25. When any key is pressed, the hammer 25 is driven by the actuator 24 corresponding to that key, and the transducer 26 is struck with a force corresponding to the pressing force or speed. Even if the key 23 remains depressed, the hammer 25 immediately returns to the normal position shown by the solid line. Therefore, the transducer 26 is struck instantly when the key is pressed. The transducer 26 outputs an electrical signal at a level corresponding to the instantaneous impact force, and may be an appropriate machine such as a piezoelectric element or a device that converts the vibration of a speaker cone paper into an electrical signal using a boiling coil. Electrical conversion means can be used. In that way, for example, the third
A differential key touch detection signal as shown in the figure is output from the touch sensor 18, ie, the transducer 26, at the beginning of each key press. Code 27, 28,
29 and 30 are channels 1, 2, 3, 4, respectively.
Shows the key touch detection signal waveforms assigned to ch1, ch2, ch3, and ch4, and each channel ch1 to
Approximately the peak level value of each touch detection signal is sampled at the generation timing of the key-on pulse KONP corresponding to ch4. Note that the output of the transducer 26 may be passed through a differentiating circuit to obtain a touch detection signal with even sharper differentiation.

As another example of the touch sensor 18, a pressure sensor such as a piezoelectric element or a pressure-sensitive conductive rubber may be provided commonly to all keys without providing the above-mentioned action mechanism. In that case, the channel
The touch detection signals corresponding to the keys assigned to ch1 to ch4 are as shown in FIG. 4, for example. In other words, it is not a simple differential waveform, but has some level depending on the pressing force while the key is being pressed. However, in general, when a key is pressed to make an initial touch, the pressure is greatest immediately after the key is pressed, and the pressing force generally decreases thereafter.
Therefore, as shown in FIG. 4, the level becomes high immediately after the start of key depression, and a key touch (initial touch) unique to each key at the beginning of key depression can be detected. In this case, the peak level of the touch detection signal usually lags some time after the start of key press, so in order to sample the peak level (near it) that most accurately detects the initial touch, the key-on rise detection circuit is used. It is preferable to delay the timing of the key-on pulse KONP output from 15 somewhat. Figure 4
KONP′ thus indicates the timing of the somewhat delayed key-on pulse KONP. In that case,
In accordance with the delayed key-on pulse KONP', the start timing of musical tones is also delayed somewhat.

The means for storing the touch detection signal (digital data) of each channel is not limited to the shift register 22, but may be a latch circuit or a random access memory (RAM). In that case
RAM writing and reading are controlled in a time-division manner for each channel. Further, the touch detection signal may be stored using an analog memory, in which case the analog/digital converter 20 is not required or is provided on the output side of the analog memory. Further, as the touch sensor 18, a sensor that outputs a touch detection signal as a digital value may be used, in which case the analog/digital converter 20
is not necessary. Furthermore, instead of storing the output signal of the touch sensor 18 or the analog/digital converter 20 as it is as a touch detection signal, the output signal is appropriately converted into a signal suitable for musical tone control (for example, by processing it with a musical tone parameter signal). , this converted signal may be stored as a touch detection signal.

Effects of the invention As described above, according to this invention, a sampling signal is generated in response to a key press, and in accordance with this sampling signal, the output signal of the touch detection means common to multiple keys is sampled and stored. Therefore, not only is there one (or a few) touch detection means, but the sampling and storage circuits associated therewith are also small-scale, which significantly contributes to miniaturization and cost reduction.

[Brief explanation of the drawing]

Fig. 1 is a block diagram showing an example of an electronic musical instrument implementing this invention, Fig. 2 is a schematic side view showing an example of the touch sensor in Fig. 1, and Fig. 3 is a block diagram showing an example of the touch sensor shown in Fig. 1. 2 is a waveform diagram showing an example of a touch detection signal outputted in response to the presses of a plurality of keys, and particularly shows an output example of a touch sensor configured to generate differential outputs as shown in FIG. 2. FIG. Similarly, FIG. 4 is a waveform diagram showing another example of the output signals of the touch sensor of FIG. 1 in response to the respective presses of a plurality of keys. 10...Keyboard, 11...Key press detection circuit, 12...
... Sound generation assignment circuit, 13 ... Musical tone generation circuit, 15
...Key-on rising detection circuit, 18...Touch sensor common to each key, 20...Analog/digital converter, 21...Selector, 22...Shift register for storing touch detection signals of each channel.

Claims (1)

[Scope of Claim for Utility Model Registration] A keyboard comprising a plurality of keys for selecting musical tones, an assignment means for assigning the sound of a key pressed on the keyboard to one of a specific number of channels, and according to this assignment. a musical tone generating means for generating musical tones in each channel; a sampling signal generating means for generating a sampling signal in response to a pressing of a key on the keyboard; and a sampling signal generating means provided commonly to the plurality of keys on the keyboard;
a touch detection means for outputting a touch detection signal corresponding to the touch of a pressed key; a sampling means for sampling the touch detection signal in accordance with a sampling signal output from the sampling signal generation means; and a sampled touch detection signal. storage means for storing keys corresponding to the touch detection signals in correspondence with channels to which keys are assigned; An electronic musical instrument that controls the musical tones of channels.