KR20020069712A - A keyboard apparatus sensing key pressure velocity and depth - Google Patents

Abstract

PURPOSE: A keyboard device for sensing the pressing velocity and depth of a key is provided to obtain special sound effects by changing the sound amount or sound frequencies according to the pressing velocity and depth of the keys, thereby obtaining various sound effects according to the skill of a player. CONSTITUTION: A keyboard device for sensing the pressing velocity and depth of a key includes light sources(12) assigned for respective keys, a plurality of key pressing depth/brightness conversion parts(14) for converting an amount of light transmitted from the light source according to the pressing velocity and depth of the keys, an optical signal output part(16) for outputting the optical signals of which brightness are converted by the pressing velocity and depth of the keys in the shape of matrix, an image sensing part(18) for image-capturing the optical signal output parts entirely, an image analyzing part(20) for processing the captured images of the image sensing part and analyzing the pressing velocity and depth of the keys according to velocity change and change amount of the brightness per the optical signal of the respective light sources, and a sound generation control part(22) for controlling sounds generated by a sound generating part(28) according to the analyzed pressing velocity and depth of the keys.

Description

A keyboard apparatus sensing key pressure velocity and depth}

The present invention relates to a keyboard device capable of changing the volume or frequency of a sound or giving a special effect to the sound according to the pressing speed and depth of the keyboard. More specifically, the present invention relates to a keyboard device capable of controlling sound generation, such as determining the volume and frequency of a sound based on the pressing speed and depth of a keyboard and giving an echo effect.

Conventionally, it was possible to adjust the volume by measuring the pressing speed of the keyboard, and could also measure the pressing depth of the keyboard. However, the measuring method of the pressing speed requires a complicated electrical wiring, and the measurement of the pressing depth has the disadvantage of requiring an expensive pressure sensor.

The present invention is an improvement of the conventional keyboard device to solve the above problems, it is possible to change the volume or sound frequency by measuring the pressing speed and depth of the keyboard through the optical signal generator and the image sensing unit of a simple structure. .

Accordingly, an object of the present invention is to provide a keyboard device that can give a special effect to the volume or frequency change of the sound and the sound according to the pressing speed and depth of the keyboard.

1 is a conceptual block diagram of the present invention.

2 is a conceptual diagram of a sound generation control method.

Figure 3a, 3b is a block diagram of a first embodiment according to the present invention.

4 is a configuration diagram of Embodiment 2 according to the present invention;

5 is a configuration diagram of Embodiment 3 according to the present invention;

<Description of Drawing>

Keyboard 10, pressure plate 11, transmissive plate 11 ', reflector plate 11 ", light source 12, key press depth-brightness conversion unit 14, optical signal output unit 16, image sensing unit 18, image analysis unit 20, sound generation control unit 22, MIDI signal generation unit 24, sound generation unit 28, tube 30, photoelectric transfer medium (32)

Conceptual Structure of the Present Invention

Conceptual diagram according to the present invention is as shown in FIG.

According to the present invention, a plurality of light sources 12, which are assigned to each key 10, vary the amount of light transmitted from the light source 12 assigned to this key 10 according to the speed and depth at which the key 10 is pressed. The key press depth-brightness conversion unit 14 of the key, the optical signal output unit 16, the optical signal output unit in which the optical signals whose brightness is varied according to the pressing speed and depth of the keyboard 10 are arranged at regular intervals and output in a matrix form The image sensing unit 18 and the image capturing the image captured by the image sensing unit 18 to capture the image 16 as a whole, pressing the key 10 at the speed and amount of change of brightness for each light signal of each light source 12 Pressing speed and depth of the key 10 analyzed by the image analysis unit 20 for the sound generated in the sound generator 28 by the image analysis unit 20, the pressed key 10 to analyze the speed and depth Sound generation control unit 22 to control in accordance with, the image analysis unit 20 of the keyboard analyzed And a MIDI signal generation section 24 for generating a sound MIDI signal corresponding to the pressing speed and depth.

In the present invention, as the key 10 is pressed, the amount of light reaching the optical signal output unit 16 from each light source 12 is changed by the key press depth-brightness converting unit 14. '1 (bright)' to '0 (dark)' or '0 (dark)' to '1 (bright)'. The optical signals of the light sources 12 emitting varying brightness form an optical signal output unit 16 by forming a matrix of surface arrays or linear arrays at regular intervals. The optical signal output unit 16 is captured by an image sensing unit 18 such as a CCD or a CMOS, and the captured image is processed by the image analyzer 20.

As such, the volume and the frequency of the sound generated by the sound generator 28 according to the change in the brightness of the optical signal according to each light source 12 analyzed through the image processing process of the image analyzer 20 are the sound generation controller 22. After controlling the sound, the sound is output. Meanwhile, the components indicated by dotted lines in FIG. 1 do not have a sound generator 28 on the keyboard itself, have a sound generator 28 on the outside, and generate a MIDI signal for outputting a MIDI signal according to the keyboard 10. The keyboard device which has a part 24 is shown.

<Operation Mode of the Present Invention>

A conceptual diagram of the sound generation control method of the present invention, which operates in the above configuration, is shown in FIG. First, the overall mode is as follows.

This mode adjusts the sound produced by measuring the 'speed' when the key is pressed by the user, or when the user releases the key, and the key returns to its original position.The sound produced by measuring the 'depth' when the key is pressed by the user. This mode can be divided into a mode for adjusting the sound generated by using both 'speed' and 'depth' in which the keyboard is pressed by the user.

Such basic control according to the operation mode of the present invention, that is, control of the volume and the frequency of sound, will be described with reference to FIG.

In FIG. 2, the x axis represents time and the y axis represents the depth of press of the keyboard. As the user starts to press the keyboard 10 (A), and as the pressing speed of the keyboard 10 changes (inclination change of AB), the brightness of the optical signal according to the light source 12 belonging to each keyboard 10 changes. The volume changes accordingly (AB). That is, the volume level is determined according to the time taken from A to B. Then, while the user presses the keyboard 10 completely (B), there is no change in the volume and the frequency of the sound is changed according to the pressed depth of the keyboard 10 (B to C). That is, if the pressed depth of the keyboard 10 is F, the frequency of the sound assigned to the original key 10 is output, and if E, the frequency is slightly smaller than the original sound frequency, and if G, the sound is slightly lower than the original sound frequency. Grows Next, when the user starts to release the keyboard 10 (C), as in the state (A-B), the volume is changed in accordance with the brightness change of the light source 12 belonging to each keyboard 10 (C-D). That is, the volume is lowered. Finally, the user returns to the initial state when the user releases the key D from the keyboard 10.

<Example of Operation Mode>

As described above, the volume control in the present invention adjusts the sound generated by measuring the 'speed' at which the key is pressed by the user or when the user releases the key to return the keyboard to its original position. Frequency control adjusts the sound produced by measuring the 'depth' the key is pressed by the user. In addition, the above two operations (that is, 'speed' and 'depth') can be applied to produce special effects such as an echo effect. Accordingly, a use example will be described with reference to FIG.

First, when the timbre is a piano, the volume increases from B as the time A-B on which the keyboard 10 is pressed is shorter. That is, the volume is determined at the movement speed of the keyboard 10. And the longer the time (A-B) the key 10 is pressed, the lower the volume from B. In addition, after the user presses the keyboard 10 to output a sound, when the user slowly releases the keyboard 10, the sound gradually echoes from D and becomes smaller, and if the user releases the keyboard 10 quickly, the sound is not echoed. The tone disappears immediately.

Second, when the tone is rich, the deeper the key is pressed, the louder the volume is. In other words, the small volume starts from A and goes up to B, and the maximum volume is obtained from B. The maximum volume is maintained from B to C, and the volume gradually decreases as it moves from C to D, and the sound is completely lost at D. In addition, in the control of the sound, the frequency instead of the volume can also be controlled. That is, when the key 10 is pressed to the middle depth, the sound of the frequency assigned to the original key 10 is output, and when pressed deeper than the middle, the frequency of the sound is higher, and when pressed less than the middle, the sound is negative. The frequency will be lowered.

As described above, in the present invention, in adjusting the sound, the volume and the frequency of the sound are adjusted by using the movement of the keyboard (pressing speed and pressing depth).

<Example of Keyboard Press Depth-Brightness Conversion Unit>

Based on the configuration according to the present invention, the amount of light of the light source in the present invention decreases as the key is pressed. That is, the brightness of the light source is changed from '1 (bright)' to '0 (dark)'. However, the present invention is not limited thereto and may be arbitrarily designed according to the design intention of the designer. In addition, in the present invention, it is possible to give a special effect to the frequency control of the volume and sound and the sound according to the key pressing speed and depth.

Here, let's look at an embodiment of a key press depth-brightness conversion unit based on the configuration according to the present invention.

Figure 3a, 3b is a configuration diagram of Example 1 (name: tube method) according to the present invention. In the first embodiment, the key press depth-brightness conversion unit 14 is a press plate 11 protrudingly attached to the lower part of the keyboard 10, an LED 12 assigned to each key 10 and turned on at a predetermined brightness, Including the LED 12 and connected to the tube 30, the inner diameter is narrowed by the pressing of the pressing plate 11, the tube 30 is reduced to pass through the tube 30 in accordance with the pressing depth of the pressing plate 11 It consists of an optical transmission medium 32 for transmitting the light of the LED 12 to the optical signal output unit (16). In the present invention, although the LED is used as the light source 12 assigned to each piano keyboard 10, the present invention is not limited thereto, and the LED 12 is provided below the keyboard 10 separately from the keyboard 10. In addition, the tube 30 in the present invention is an opaque soft material, and the inner surface thereof does not absorb light well and reflects light well. The optical transmission medium 32 may be made of a decorative optical fiber such as glass or plastic.

The operation according to the configuration of the first embodiment as described above is as follows.

Each key 10 of the present invention is assigned a light source 12, that is, an LED. The user presses the keyboard 10, and as the key 10 is pressed, the user presses the tube 30 including the LED 12 on the pressing plate 11 protruding from the lower portion of the keyboard 10. You will press the keyboard 10 at the speed and depth you pressed. At this time, the LED 12 light, which is always turned on at a predetermined brightness, exits to the optical transmission medium 32 through the narrowed inner diameter of the tube 30 by the speed and depth pressed by the pressure plate 11, and the optical transmission medium 32. It is transmitted to the optical signal output unit 16 through.

The light generated from the light source 12 of each key 10 reaches the optical signal output unit 16 by the pressing of the key 10 to change the light signal, that is, the light that emits light of the changed brightness. The optical signal output unit 16 in which the transmission medium 32 is a matrix of surface arrays or linear arrays is captured by the image sensing unit 18, that is, the CCD sensor.

As the image sensing unit 18 in the present invention, a commonly used CCD or CMOS sensor was used. The image capturing method by the CCD sensor includes a line CCD and an area CCD. In FIG. 3A, the optical signal output unit 16 in which the photoconductive medium 32 is plane-arranged for the surface-sensitive CCD sensor is illustrated. It is possible.

As such, the image captured by the image sensing unit 18 is image processed through the image analyzing unit 20. That is, it is to analyze the change state of the brightness for each light source 12, the analysis is performed to compare the change of the brightness value of the pixel at a predetermined position of the captured image.

The sound generator 28 is controlled by the sound generator controller 22 for controlling the volume and the frequency of the light from the brightness of the light transmitting medium 32 according to each light source 12 analyzed by the image analyzer 20. Controlled. That is, by using the brightness of the light transmitting medium 32 according to each light source 12 analyzed by the image analyzer 20, the sound generator (inversely proportional to the brightness or proportional to the rate of change of the brightness). The sound generation control unit 22 controls the 28 to be output.

FIG. 4 is a configuration diagram of Embodiment 2 (name: gray scale shielding system) according to the present invention, in which the key press depth-brightness conversion unit 14 is assigned to each key 10 and is turned on at a predetermined brightness (12). The plate is attached to the lower part of the keyboard 10, and the light of the LED 12 is transmitted, and the transmission plate 11 'is made so that the transmittance gradually decreases from one side to the other side (gradation). And a phototransmitter 32 which transmits the light of the LED 12 passing through the transmission plate 11 'to the optical signal output unit 16 according to the depth and depth.

Looking at the operation according to the configuration of the second embodiment are as follows.

Each key 10 is assigned a light source 12, that is, an LED, as in the first embodiment. The user presses the keyboard 10, and as the keyboard 10 is pressed, the transmission plate 11 ′ attached to the lower portion of the keyboard 10 descends. As described above, the transmission plate 11 ′ is manufactured so that the transmittance gradually decreases from one side to the other side. In this embodiment, the transmittance is decreased from the bottom to the top. And the speed and depth at which the transmissive plate 11 'descends by the speed and depth at which the user presses the keyboard 10 is different, and the brightness of the LED 12 shining behind the transmissive plate 11' is the transmissive plate 11 '. Decreases, the brightness exiting through the transmission plate 11 'decreases. Light emitted through the transmission plate 11 ′ exits to the light transmitting medium 32 and is transmitted to the optical signal output unit 16 through the light transmitting medium 32.

The technical features after the optical signal output unit 16 are as described in the first embodiment.

Fig. 5 is a configuration diagram of Embodiment 3 (name: gradation reflection plate method), in which the key press depth-brightness conversion unit 14 is assigned to each key 10, and the LED 12 and the key 10 are turned on at a predetermined brightness. Reflector plate 11 ″, which is attached to the lower part and reflects light of the LED 12, is formed so that the reflectance gradually decreases (gradation) from one side to the other side, and reflector plate (depending on the pressing speed and depth of the keyboard 10) 11 ″), a light transmission medium 32 that transmits the brightness of the LED 12 reflected from the light signal output unit 16 to the light signal output unit 16 is formed.

Operation according to the configuration of the third embodiment is as follows.

Each key 10 is assigned a light source 12, that is, an LED, as in the first and second embodiments. The user presses the keyboard 10, and as the keyboard 10 is pressed, the reflecting plate 11 ″ attached to the lower portion of the keyboard 10 descends. As described above, the reflecting plate 11 ″ is manufactured so that the reflectance gradually decreases from one side to the other side, but in this embodiment, the reflectance decreases from the bottom to the top. The speed and depth at which the reflector 11 ″ descends by the speed and depth at which the user presses the keyboard 10 is different, and the light of the LED 12 shining from the front of the reflector 11 ″ is lowered by the reflector 11 ″. Increasingly, the brightness reflected through the reflector 11 ″ is reduced. The reduced brightness emitted through the reflecting plate 11 ″ is transmitted to the optical signal output unit 16 through the light transmitting medium 32.

The technical features after the optical signal output unit 16 are as described in the first embodiment.

As described above, the present invention is a keyboard device having a simple mechanical structure, unlike a conventional complex keyboard device, and gives special effects such as volume or sound frequency change and echo effects according to the speed and depth at which a key is pressed. Therefore, various sound effects can be obtained according to the skill of the player who adjusts the pressing speed and depth of the keyboard.

Claims (9)

In the keyboard device having a sound generator for generating a sound of different frequencies when a plurality of keys are pressed, The light source assigned to each key, Multiple key press-to-brightness converters that vary the amount of light transmitted from the light source assigned to this key depending on the speed and depth at which the key is pressed, Optical signal output unit that is arranged in regular intervals of the optical signal is changed in brightness according to the pressing speed and depth of the keyboard, Image sensing unit for capturing the optical signal output unit as a whole, An image analyzer which processes the image captured by the image sensing unit and analyzes the pressing speed and depth of the keyboard by the speed and amount of change of brightness for each light signal of each light source; A keyboard device capable of sensing the pressing speed and depth of the keyboard, comprising a sound generating control unit for controlling the sound generated in the sound generating unit by the pressed key according to the pressing speed and depth of the key analyzed by the image analyzing unit. In a keyboard device that outputs a corresponding MIDI signal when a plurality of keys are pressed, The light source assigned to each key, Multiple key press-to-brightness converters that vary the amount of light transmitted from the light source assigned to this key depending on the speed and depth at which the key is pressed, Optical signal output unit that is arranged in regular intervals of the optical signal is changed in brightness according to the pressing speed and depth of the keyboard, Image sensing unit for capturing the optical signal output unit as a whole, An image analyzer which processes the image captured by the image sensing unit and analyzes the pressing speed and depth of the keyboard by the speed and amount of change of brightness for each light signal of each light source; And a MIDI signal generation unit for generating a sound MIDI signal corresponding to the pressing speed and depth of the keyboard analyzed by the image analyzing unit. The keyboard device of claim 1 or 2, wherein the matrix of the optical signal output unit is an array of optical signals of each light source, and the image sensing unit is a surface-sensitive CCD or CMOS sensor. The keyboard device of claim 1 or 2, wherein the matrix of the optical signal output unit is pre-arranged with the optical signals of each light source, and the image sensing unit is a line-sensitive CCD or CMOS sensor. The keyboard device as set forth in claim 1 or 2, wherein a volume or a frequency of a sound changes as the depth of the key deepens. The keyboard device as set forth in claim 1 or 2, wherein a volume or a frequency of a sound is changed as a key pressing speed is increased. The key press depth-brightness conversion unit of claim 1, wherein the key press depth-brightness converting unit includes a press plate attached to the lower part of the keyboard, an LED assigned to each key and turned on at a predetermined brightness, and the inner diameter is narrowed by pressing the press plate. Loss tube consists of a light transmission medium which is connected to the tube and transmits the light of the reduced LED passing through the tube to the optical signal output according to the pressing speed and depth of the pressing plate. As the key is pressed, the inner plate of the tube is narrowed while the pressing plate of the lower part of the key presses the tube, thereby decreasing the brightness of each light source transmitted to the optical signal output unit through the photoelectric transmission medium. Keyboard device capable of detecting. The method according to any one of claims 1 to 4, wherein the key press depth-brightness conversion unit is a LED assigned to each key and turned on at a predetermined brightness, and is attached to the lower part of the keyboard so that light of the LED is transmitted, and the transmittance gradually increases from one side to the other side. It consists of a transmission plate manufactured to reduce, and an optical transmission medium that transmits the light of the LED passing through the transmission plate to the optical signal output unit according to the pressing speed and depth of the keyboard. A keyboard device that can sense the pressing speed and depth of the keyboard, characterized in that the transmission plate is lowered as the key is pressed to change the transmission amount of light emitted from the LED to be transmitted to the optical signal output unit. The method according to any one of claims 1 to 4, wherein the key press depth-brightness conversion unit is an LED assigned to each key and turned on at a predetermined brightness, and is attached to the lower part of the keyboard to reflect the light of the LED. Reflector is made to reduce, consisting of a light transmission medium for transmitting the light of the LED reflected from the reflector according to the pressing speed and depth of the keyboard to the optical signal output unit, A keyboard device that can detect the pressing speed and depth of the keyboard, characterized in that for changing the reflected amount of light emitted from the LED as the reflection plate is lowered as the key is pressed to be transmitted to the optical signal output unit.