JPH0833732B2 - Electronic piano - Google Patents

Description

Description: TECHNICAL FIELD The present invention faithfully reproduces the sound of an acoustic piano up to the sound when the sustain pedal is on, and furthermore, the electronic piano that can change the sound when the pedal is on in a programmable manner. It is about.

2. Description of the Related Art FIG. 4 shows a configuration example of a conventional electronic piano. In FIG. 4, when the keyboard 15 is pressed, the key scanning unit 17 detects the key-pressing position indicating which key is pressed, and the key velocity detecting unit detects the key velocity (the speed at which the key is pressed). To be detected. The memory 21 divides the tone range of the piano into some (for example, every octave), and stores tone color data corresponding to several kinds of key velocities for each. Address control unit 19
Determines, from the detected key velocity and key-pressing position, which tone range and intensity of the tone color data to access, and determines the read start address of the memory 21. The clock generator 20 determines, from the detected keystroke position, the number of the sound in the divided tone range, and generates the read clock of the corresponding frequency. For example, if the read clock frequency _s1 of the lowest sound in the divided range is set, the read clock frequency _sn of the nth sound is Becomes This is because when the pitch rises one octave (12 times a half pitch), the frequency of the sound doubles. An example of the operation of the envelope controller 22 is shown in FIG. When the keyboard remains depressed, the envelope will decay naturally as shown in Figure 2a. When the keyboard is released during the attenuation, the envelope is lowered from that point as shown in FIG. 2b. However, if the pedal is depressed and is in the ON state, the envelope is naturally attenuated even when the keyboard is released as shown in FIG. 2C, and the envelope is lowered when the pedal is turned off.

In the D-A converter 23, the output of the envelope control unit 22 is changed to D
-A conversion and output as an analog signal.

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention However, in the above-mentioned conventional electronic piano, although the change in the envelope due to the on / off of the sustain pedal can be expressed, the change in the tone color when the sustain pedal is on cannot be expressed. This is because in an acoustic piano, when you hit the key without pressing the sustain pedal, the damper touches the struck string (a part that suppresses the vibration of the string with the felt).
However, when the sustain pedal is depressed, the dampers are released from all strings, so strings other than the struck string also resonate, resulting in a different tone from when the sustain pedal is not depressed. However, the conventional electronic piano uses the same tone color data stored in the memory when the pedal is on and when it is off.

The present invention has been made to solve the above-mentioned conventional problems, and an object of the present invention is to provide an electronic piano capable of expressing even a tone color change when a sustain pedal is depressed.

Means for Solving the Problems In order to achieve the above object, the electronic piano of the present invention,
The keyboard, the sustain pedal, the key scan unit that detects the position and timing of the key stroked, the key velocity detection unit that detects the speed of key strike, and the output of the key scan unit An address control unit that receives a clock generator that generates a clock of a frequency corresponding to the position, a key scan unit and a key velocity detection unit, and that generates a memory read address in synchronization with the clock generated by the clock generator. A first memory, a first envelope control unit that controls the amplitude of output data from the first memory by a key velocity detection unit, a key scan unit, and an output of a sustain pedal;
To n + 1th memory, n constant multipliers that multiply the outputs of the n memories by a constant, a first adder that adds the outputs of the n constant multipliers, and A second envelope control unit that controls the amplitude of the output of the adder by the output of the key velocity detector, the key scan unit, and the sustain pedal, and a second adder that adds the outputs of the first and second envelope control units And a DA converter for DA converting the output of the second adder.

Function With this configuration, when the sustain pedal is depressed during piano performance, the envelope of the sound being sounded at that time is extended, and at the same time, the tone color data of the pitch corresponding to the resonance of the strings other than the pressed string is stored in the memory. By reading out, the sound even when the sustain pedal is on can be expressed.

Embodiment An embodiment of the present invention will be described below with reference to the drawings. In FIG. 1, reference numeral 1 is a keyboard, 2 is a sustain pedal, 3 is a key scanning section for detecting the position and timing of the pressed keys, 4 is a key velocity detecting section for detecting the speed of tapping, and 5 is an address. A control unit, 6 is a clock generator that generates a clock having a frequency corresponding to the position of a keyboard key, 7 is a first memory, 8 is a second to (n + 1) th n memories, and 9 is a constant number. Multiplier, 10 is the first adder, 11 is the first envelope controller, and 12 is the second
Envelope control unit, 13 is a second adder, and 14 is D-A
It is a converter.

The operation of the electronic piano configured as described above will be described below.

Keyboard 1, sustain pedal 2, key scan unit 3, key velocity detection unit 4, clock generator 6, address control unit 5, first envelope control unit 11 and DA converter.
The operation of 14 is the same as the conventional example. The first memory 7 stores the tone color data of the sound produced by tapping the piano keyboard without pressing the sustain pedal 2. If the keyboard 1 is hit without pressing the sustain pedal 2, the first
The data read from the memory 7 is reproduced as sound.

The nth memories from the 2nd to the (n + 1) th, the sounds stored at the corresponding addresses in the first memory 7 are extracted as n characteristic harmonics from the resonance sound when the sustain pedal is turned on. And remembered. These memories are the first
Are read out at the same time as the reading from the memory 7, and their outputs are respectively appropriately weighted by the constant multiplication circuit 9 and added by the addition circuit 13. This weighting is programmable, so that various sustain pedal sounds can be obtained.

The operation of the second envelope controller 12 is shown in FIG.
When the sustain pedal is off, the second envelope control section 11
The level of the envelope created by is "0", that is, the second
The harmonics when the sustain pedal is on, which is the output of the adder 14 of, are not passed. When the sustain pedal is turned on, the envelope is an acoustic piano, and it rises with a time constant that corresponds to the time when the strings start to resonate after the damper is disengaged. After that, when the sustain pedal is turned off, the output of the first envelope controller 11 Fall down.

The adder 13 adds the outputs of the two envelope control units 11 and 12 and outputs the result to the DA converter 14.

EFFECTS OF THE INVENTION As is apparent from the above embodiments, the present invention provides a keyboard, a sustain pedal, a key scan circuit, a key velocity detection section, an address control section, a clock generation section, and a first section.
Memory, second to n + 1th n memories, n constant multipliers, a first adder, a first envelope controller, a second envelope controller, and a second envelope controller. It consists of an adder and a DA converter, and can express the change and sound of the piano sound when the sustain pedal is depressed, which was impossible with the conventional electronic piano. In addition, by changing the weighting coefficient of each harmonic of the resonance tones in a programmable manner, the sound when the sustain pedal is turned on can be variously changed.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of an electronic piano in one embodiment of the present invention, FIG. 2 is a waveform diagram showing an operation of a first envelope control unit in a conventional example and one embodiment of the present invention, and FIG. Is a timing diagram showing the operation of the second envelope control section in the present embodiment, and FIG. 4 is a block diagram showing the configuration of a conventional electronic piano. 1 ... keyboard, 2 ... sustain pedal, 3 ... key scan section, 4 ... key velocity detection section, 5 ... address control section, 6 ... clock generator, 7,8 ... memory, 9 ...
… Constant multiplier, 10 …… Adder, 11 …… Envelope controller, 12 …… Envelope controller, 13 …… Adder, 14 ……
DA converter.

Claims (1)

[Claims] 1. A keyboard, a sustain pedal, a key scanning unit for detecting the position of the depressed key and the timing of key depression, a key velocity detecting unit for detecting the speed of key depression, and an output of the key scanning unit. A clock generator that generates a clock having a frequency corresponding to the position of a key on the keyboard, and a memory read address that synchronizes with the clock generated by the clock generator by the outputs of the key scan unit and the key velocity detection unit. An address control unit for generating, a first memory, a first envelope control unit for controlling the amplitude of output data from the first memory by the output of the key velocity detection unit, the key scan unit, and the sustain pedal, 2nd to (n + 1) th n memories, and n constant multipliers that multiply the outputs of the n memories by a constant, respectively. A first adder for adding the outputs of the n constant multipliers, and a second adder for controlling the amplitude of the output of the first adder by the outputs of the key velocity detection unit, the key scan unit, and the sustain pedal. An electronic piano including an envelope control section, a second adder for adding outputs of the first and second envelope control sections, and a digital-analog converter for digital-analog converting the output of the second adder. .