TWI517138B - Method for generating musical frequencies and keyboard type input device and system thereof - Google Patents

Description

Audio generating method and key input device and system thereof

The present invention relates to an audio generating method, and more particularly to an audio generating method and a key input device and system thereof.

The keyboard is a common keyboard instrument. The internal components include keyboard, sound generator, rhythm and chord generator, amplifier and amplifier, human interface software, and some have memory, MIDI and so on. The sound output of the keyboard is an electronic signal that is emitted by the electronic component and amplified, and the sound is emitted through the earphone or the speaker.

Another kind of electronic organ, often called an electronic synthesizer, has the function of editing and modifying the tone and rhythm more than the above-mentioned keyboard, and can transmit the modification result to the computer. However, regardless of the type of keyboard, the keys usually have 61 keys, 76 keys, 78 keys, 88 keys, and the like. Therefore, such a keyboard usually occupies a considerable volume, especially a relatively long length, making it inconvenient to carry. However, if you want to reduce the volume of the keyboard and reduce the number of keys, you will inevitably reduce the number of scales that the user can play.

Therefore, how to make the keyboard easy to carry without reducing the number of keys is an urgent problem to be solved.

In view of the above problems, the present invention provides an audio generating method and a key input device and a system thereof, thereby solving the problem of the inconvenience of carrying the keyboard in the prior art.

The present invention provides an audio generating method which first provides a plurality of key input devices, wherein each of the key input devices has a plurality of keys. Next, the key input devices are arranged in an arrangement direction, and the arrangement relationship of the key input devices in the arrangement direction is identified. Next, it is detected whether the plural keys are pressed. When it is detected that at least one of the keys is pressed, an audio signal is adjusted according to the arrangement relationship and the position of the pressed key and output.

In addition, the present invention provides a piano-type input system including a key set, an audio generator, and a two-signal port. The key set includes a plurality of keys. The audio generator is electrically connected to the key group to generate an audio signal in response to the pressing of the key. The signal connection is electrically connected to the audio generator. The corresponding signal connections of the two adjacent key input devices in the plurality of key input devices are electrically connected to each other, so that the key input devices have an arrangement relationship. When at least one of the plurality of keys is pressed, the audio generator adjusts the audio signal according to the arrangement relationship and the position of the pressed key and outputs the audio signal.

Furthermore, the present invention provides a keyboard type input device including a key group, an audio generator, and at least one signal port. The set of keys includes a plurality of first keys. The audio generator is electrically coupled to the set of keys in response to the pressing of the first key. The signal connection is electrically connected to the audio generator. The signal connection port of the key input device and the signal connection of the other keyboard input device are electrically connected such that the adjacent two keyboard input devices have an arrangement relationship. Wherein, when at least one of the plurality of first keys is pressed, the audio generator adjusts a first audio signal according to the arrangement relationship and the position of the pressed first key and outputs.

The audio generating method and the key input device and system thereof of the present invention can arrange and arrange the key input devices in an arrangement direction according to user requirements, and adjust the audio signals according to the arrangement relationship and the position of the pressed keys, so that these The keyboard-type input devices can be combined for use in one unit, and can be disassembled and separated for easy carrying when not in use.

1 is a flow chart of an audio generating method according to an embodiment of the present invention. 2 is a perspective view of a keyboard type input device 100 according to an embodiment of the present invention. 3 is a block diagram of a keyboard type input device 100 in accordance with an embodiment of the present invention.

Referring to Figures 1 to 3, the audio generating method of the embodiment of the present invention includes the following steps:

Step S010: A plurality of key input devices 100 are provided, wherein each of the key input devices 100 has a plurality of keys 112. As shown in FIG. 2, the key 112 can be a white key and a black key between the white keys. The five black keys and the seven white keys constitute an octave interval (ie, C, D, E, F, G, A, B sound names). Therefore, the number of keys 112 of the keyboard type input device 100 can represent an integer number of octaves, and the second figure is an example of an octave. Here, the key 112 of the embodiment of the present invention is exemplified by a mechanical key. However, the present invention is not limited thereto, and the key 112 may be in the form of a thin film keyboard or a touch panel, and may be coated with a conductive material. The plane.

Step S020: Arranging the plurality of keyboard type input devices 100 in an arrangement direction. 4 is a schematic view showing the arrangement of the keyboard type input device 100 according to an embodiment of the present invention. As shown in Fig. 4, the key input device system may include a plurality of key input devices 100, exemplified by five. The five key input devices 100 are arranged close to each other with their keys 112 facing in the same direction. However, the number of the keyboard type input devices 100 is not limited to five, and may be more or less depending on user requirements. In addition, the direction of the arrangement is exemplified by a line shape in the embodiment of FIG. 4, but may be designed as an arc or a polygon or the like according to actual needs.

Step S030: Identify one of the arrangement relations of the keyboard type input device 100 in the arrangement direction. How to identify the arrangement relationship will be described in detail later. Here, the arrangement relationship refers to the ordering of the keyboard type input devices 100, for example, from left to right, respectively, whereby it is possible to subsequently know which of the keys of the keyboard type input device 100 is pressed, in order to adjust the corresponding audio. The frequency of the signal is high or low. Thereby, the combined key input device 100 can output audio signals of different pitches.

Step S040: detecting whether the key 112 is pressed;

Step S050: When it is detected that at least one of the plurality of keys 112 is pressed, an audio signal is adjusted according to the arrangement relationship and the position of the pressed key 112 and output. After the audio signal is adjusted, the frequency of the audio signals corresponding to the same key 112 of the plurality of key input devices 100 may be a multiple relationship according to actual needs, and may of course be adjusted according to different user function requirements. In this embodiment, the adjustment of the audio signal is performed by adjusting the frequency of the audio signals corresponding to the same key 112 of the plurality of key input devices 100 to be increased by the order of the key input devices. For example, the ratio of the frequencies of the three audio signals corresponding to the keys 112 of the phonetic name C is 1:2:4.

The table below shows the frequency values corresponding to the C major octave scale. When the tone is raised, the same name frequency changes in multiples. For example, C at a high octave is twice the frequency value of the center C, ie 524 Hz. Conversely, B at the lower octave is half the frequency value of the center B, that is, 247 Hz. In other words, the multiple change (multiplier relationship) referred to herein may be N times (N is a positive integer such as 2 times, 3 times, 4 times, etc.) or 1/N times (N is a positive integer such as 1/ 2 times, 1/3 times, 1/4 times, etc.).

Here, how to realize the arrangement relationship of the key input device 100 will be described. Referring to Fig. 5, there is shown a flow chart of an audio generating method according to another embodiment of the present invention. The difference between FIG. 5 and FIG. 1 is that the audio generating method of the embodiment further includes step S011: storing a plurality of device codes, wherein each of the plurality of device codes corresponds to each of the keyboard-type input devices 100, and the device code is different as the identification. The key input device identity (ID), for example, the device code 01 corresponds to the first key input device, the device code 02 corresponds to the second key input device, and so on. In addition, the device code may be preset to the keyboard input device at the factory, and may be a unique code. The device code can also be generated by user settings. Here, step S011 may also be after step S020. As shown in FIG. 3, the key input device 100 can include a key group 110, a signal port 130, a sound source output port 150, an audio adjustment button 190, and an audio generator 190. The device code can be stored in the audio generator 190. The audio generator 190 can be a processor that can include a digital analog converter to detect the triggering of the key 112 and convert it to an audio signal output corresponding to a frequency value. However, the audio signal of the present invention is not limited to the analog signal, and the audio signal can also be a digital signal, which can be a frequency value.

The foregoing step S030 may include the following steps. First, the device code of the adjacent plurality of key input devices 100 is identified (step S031). In this step, the signal port 130 of each of the key input devices 100 is electrically connected to each other to transmit the device code through the signal port 130. Then, each of the keyboard type input devices 100 can acquire the device code of the adjacent key input device 100 via the signal port 130 (step S032). Next, the arrangement relationship of the plurality of key type input devices 100 can be identified based on the device codes of the adjacent plurality of key type input devices 100 (step S033). In other words, when the device codes of the key input devices 100 on the adjacent two sides of the adjacent key input devices 100 are known, the device codes of the keyboard input devices 100 can be known, and the keys can be known. The arrangement relationship of the input devices 100. Here, one of the key input devices 100 may be the main control device, and the others are controlled devices. Each controlled device transmits the device code directly or indirectly via the signal port 130 to the master device, and the master device identifies the arrangement relationship of the keyboard input device 100.

As shown in FIG. 2, the signal port 130 can include a fixed structure 131 and a connection terminal 132. The keyboard input device 100 can be detachably connected via the fixed structure 131 and transmit audio signals and/or device codes via the connection terminal 132. The fixing structure 131 can be connected to each other by means of snapping, snapping, magnetic attraction or the like. Therefore, the master device can decide whether to adjust the frequency of the audio signal according to which keyboard input device the audio signal comes from. Here, the signal port 130 can transmit an audio signal or/and a device code, such as I ² C, through a serial transmission technique.

Figure 6 is a flow chart of an audio generating method according to still another embodiment of the present invention. Figure 7 is a schematic illustration of a piano input system in accordance with an embodiment of the present invention. Referring to Figures 6 and 7, the audio generating method of this embodiment can further include the following steps as compared with the method shown in Figure 1.

First, different device codes are stored in each of the key input devices 100' (step S011), and a detection platform 200 having a plurality of placement areas 230 is provided (step S021). Here, step S021 is not limited to after step S011, and may be before step S021. Next, each of the plurality of key input devices 100' is placed in each of the placement areas 230 of the detection platform 200 (step S022).

In the foregoing step S030, each placement area 230 detects the device code of each of the keyboard type input devices 100' to recognize the arrangement relationship (step S034). Here, the signal port 130 of the keyboard input device 100' can be electrically connected to the corresponding signal port 130 on the detection platform 200, and the aforementioned audio generator 190 can be disposed in the detection platform to identify each key. The arrangement relationship of the input device 100'. However, the embodiment of the present invention is not limited to transmitting the device code in a wired manner, and the device code can also be transmitted through a wireless communication manner, so that it is not necessary to provide the foregoing signal port 130, wherein the wireless communication mode can be, for example, near field communication (NFC). Radio frequency (RF), Bluetooth (BT) and other ways to achieve.

Fig. 8 is a schematic diagram showing the combination of the keyboard type input device 100 according to an embodiment of the present invention. Figure 9 is a flow chart of another audio generating method in accordance with an embodiment of the present invention. Referring to Figures 8 and 9, the audio generation method may further include the following steps:

Step S061: providing a second signal port 130 that can transmit the audio signal to the opposite first side 101 and second side 102 of each of the keyboard input devices 100.

Step S062: A sound source output port 150 is provided on the first side 101. The sound source output port 150 is electrically connected to the audio generator 190 and can receive the audio signal adjusted by the audio generator 190.

Step S063: The plurality of key input devices 100 are electrically connected via the two-signal connection port 130, so that the two adjacent key input devices 100 of the plurality of key input devices 100 are attached to each other by the first side 101 and the second side 102. Only one source output 埠150 is revealed (as shown in Figure 4). Thereby, the sound source output port 150 that is not used can be shielded. Here, referring to FIG. 2, the left-hand keyboard input device 100 is electrically connected to the signal port 130 of the right-type keyboard input device 100 by its signal port 130 to receive the output of the right-type keyboard input device 100. The second audio signal. The second audio signal is generated in response to pressing of the second key 112b of the keyboard input device 100 on the right side. Similarly, the left-key keyboard type input device 100 generates a first audio signal in response to the pressing of the first key 112a. Here, the left keyboard input device 100 is the master device, and the right keyboard input device 100 is the controlled device, so the master device can adjust at least one of the first audio signal and the adjusted second audio signal. One. However, the present invention is not limited to the leftmost key input device 100, which must be a master device, and can be adjusted as the case may be.

Step S064: output the adjusted audio signal via the exposed sound source output 埠150. Referring to Fig. 12, there is shown a schematic diagram of a piano type input system in accordance with another embodiment of the present invention. The key input system can further include an electronic device 300. The electronic device 300 can electrically connect the sound source output port 150 of the key input device 100 via a transmission line. Thereby, the sound output module in the electronic device 300 can convert the audio signal into sound broadcast, or further utilize the audio signal for other purposes, such as storage, game control, and the like. The electronic device 300 can be a smart electronic device. The electronic device 300 is exemplified by a smart tablet. However, the present invention is not limited thereto, and the electronic device 300 can also be a smart phone, a notebook computer, or a table. Upper computer, etc. The audio output 埠150 can be a headphone jack or a USB or the like.

Figure 13 is a block diagram showing a piano type input device 100 according to another embodiment of the present invention. As shown in FIG. 13, the keyboard input device 100 can wirelessly transmit 160 audio signals to the electronic device 300 by using the wireless communication module 160 instead of the audio source output port 150. Here, the wireless communication module 160 can support communication technologies such as infrared, Bluetooth, radio frequency or wireless network.

Figure 10 is a flow chart of still another audio generating method in accordance with an embodiment of the present invention. Referring to Figures 8 and 10, the audio generation method may further include the following steps:

Step S071: providing a first signal side surface 101 and a second side surface 102 of the second signal port 130 of the audio input device 100.

Step S072: An audio adjustment button 170 is provided on the second side 102. The audio adjustment button 170 is a component for external input such as a button, a toggle switch, or the like.

Step S073: serially connecting the plurality of key input devices 100 via the two signal connection ports 130, so that the adjacent two key input devices 100 are attached to each other with the first side 101 and the second side 102, and only one audio adjustment button is exposed. 170 (as shown in Figure 4). Thereby, the audio adjustment knob 170 that is not used can be shielded.

Step S074: Adjust the frequency of the audio signal of each of the keyboard-type input devices 100 in response to the pressing of the exposed audio adjustment button 170. Referring to FIG. 3, the audio adjustment button 170 is electrically connected to the audio generator 190. When the audio generator 190 detects that the audio adjustment button 170 is triggered, the audio signal of each of the keyboard input devices 100 can be adjusted accordingly. frequency. For example, when the audio signal output by the keyboard input device 100 is an octave of C major, and the KEY is C#, the audio signals corresponding to all the keys can be transposed accordingly.

According to the foregoing, although the audio source output port 150 is located on the first side 101 and the audio adjustment button 170 is located on the second side 102 in different embodiments, the present invention is not limited to the audio source output port 150 and the audio adjustment button 170 being located in the key input device 100. Relative to the two sides. The sound source output port 150 and the audio adjustment button 170 may also be located anywhere on the same side or the keyboard type input device 100.

In some embodiments, the signal port 130 and the sound source output port 150 that are not connected to the other keyboard input devices 100 can be disabled to prevent the user from accidentally inserting other devices to cause damage to the keyboard input device 100.

Figure 11 is a perspective view of a piano-type input device 100 in accordance with another embodiment of the present invention. As shown in Fig. 11, the keyboard type input device includes a seat 103 and a side cover 104. The side cover 104 is removably attached to one side of the seat 103 (eg, connected by pivoting, snapping, sliding, magnetically, etc.). A key group 110 is provided on the upper surface of the table 103. The key set 110 is adjacent to the joint of the seat 103 and the side cover 104 adjacent to one side of the side cover 104. Thereby, when the two keyboard type input devices 100 are connected to each other, the key groups 110 of the two are also close to each other, so that the combination of the plurality of keyboard type input devices 100 and the keys 112 are identical to that of a general electronic keyboard. The signal connection port 130 can be disposed on one side of the seat 103 adjacent to the side cover 104 to be exposed after the side cover 104 is removed to be connected to the signal connection port 130 of the other keyboard input device 100. .

In summary, the audio generating method and the key input device and system thereof of the present invention can arrange and arrange the key input devices in an arrangement direction according to user requirements, and adjust according to the arrangement relationship and the position of the pressed keys. The audio signal enables these key input devices to be combined and used together, and can be disassembled and separated for easy carrying when not in use.

While the present invention has been described above in the foregoing embodiments, it is not intended to limit the invention, and the invention may be modified and modified without departing from the spirit and scope of the invention. The scope of patent protection shall be subject to the definition of the scope of the patent application attached to this specification.

100, 100'‧‧‧Key input device
101‧‧‧ first side
102‧‧‧ second side
103‧‧‧Seat
104‧‧‧ side cover
110‧‧ ‧Key group
112‧‧‧Keys
112a‧‧‧ first key
112b‧‧‧second key
130‧‧‧Signal connection埠
131‧‧‧Fixed structure
132‧‧‧Connecting terminal
150‧‧‧Source output埠
160‧‧‧Wireless communication module
170‧‧‧Audio adjustment button
190‧‧‧Audio generator
200‧‧‧Detection platform
230‧‧‧Placement area
300‧‧‧Electronic device step S010‧‧‧ provides a plurality of key input devices, wherein each key input device has a plurality of key steps S011‧‧‧ stores different device codes in each of the key input devices step S020‧‧ Steps of arranging a plurality of key input devices in a direction of arrangement S021‧‧ Providing a detection platform having a plurality of placement areas Step S022‧‧‧ respectively placing each of the plurality of key input devices in each placement area of the detection platform Step S030‧ ‧ ‧ Identifying the arrangement of the keyboard input device in one of the arrangement directions Step S031‧‧‧ Identifying the device code of the adjacent plurality of key input devices Step S032‧‧ The code step S033‧‧‧ identifies the arrangement relationship of the plurality of key type input devices according to the device codes of the adjacent plurality of key type input devices. Step S034‧‧‧ identifies the device code of each key input device by each placement area Steps of arranging the relationship S040‧‧‧ Detecting whether the key is pressed or not, step S050‧‧ is detected in the plurality of keys When a key is pressed, an audio signal is adjusted according to the arrangement relationship and the position of the pressed key, and the output step S061‧‧ provides a second signal connection for transmitting the audio signal to the opposite first side of each of the key input devices And a second side step S062‧‧ provides a sound source output on the first side step S063‧‧‧ connects the plurality of key input devices via the two signal connection, so that two adjacent keys of the plurality of key input devices The input device is configured such that the first side and the second side are attached to each other, and only one sound source is exposed. Step S064‧‧‧ Outputs the adjusted audio signal via the exposed sound source. Step S071‧‧ Provides transmittable audio The second signal of the signal is connected to the opposite first side and the second side of each of the key input devices. Step S072‧‧ provides an audio adjustment button on the second side step S073‧‧‧ connected via two signals a plurality of key input devices, such that the adjacent two key input devices are attached to each other with the first side and the second side, and only one sound is revealed Step S074‧‧‧ adjustment knob is pressed in response to reveal the audio adjustment knob to adjust the frequency of each of the audio signals of the key input device

[Fig. 1] is a flow chart of an audio generating method according to an embodiment of the present invention. [Fig. 2] is a perspective view of a keyboard type input device according to an embodiment of the present invention. [Fig. 3] is a block diagram showing a key input device according to an embodiment of the present invention. [Fig. 4] Fig. 4 is a schematic view showing the arrangement of a key type input device according to an embodiment of the present invention. [Fig. 5] is a flowchart of an audio generating method according to another embodiment of the present invention. [FIG. 6] is a flowchart of an audio generating method according to still another embodiment of the present invention. [Fig. 7] is a schematic view of a piano type input system according to an embodiment of the present invention. [Fig. 8] is a schematic view showing a combination of a key type input device according to an embodiment of the present invention. [Fig. 9] is a flow chart showing another audio generating method according to an embodiment of the present invention. [Fig. 10] is a flow chart of still another audio generating method according to an embodiment of the present invention. [Fig. 11] is a perspective view showing a piano type input device according to another embodiment of the present invention. [Fig. 12] is a schematic diagram of a piano type input system according to another embodiment of the present invention. [Fig. 13] is a block diagram showing a key type input device according to another embodiment of the present invention.

100‧‧‧Key input device

101‧‧‧ first side

102‧‧‧ second side

110‧‧ ‧Key group

112a‧‧‧ first key

112b‧‧‧second key

130‧‧‧Signal connection埠

150‧‧‧Source output埠

170‧‧‧Audio adjustment button

Claims (20)

An audio generating method, comprising: providing a plurality of key input devices, wherein each of the key input devices has a plurality of keys; arranging the plurality of key input devices in an arrangement direction; and identifying one of the plurality of key input devices in the arrangement direction Arranging a relationship; detecting whether the plurality of keys are pressed; and detecting that at least one of the plurality of keys is pressed, adjusting an audio signal according to the arrangement relationship and the position of the pressed key, and outputting the audio signal. The audio generating method of claim 1, wherein the audio signal is adjusted, and the frequency of the audio signal corresponding to the same key of the plurality of key input devices is a multiple relationship. The audio generating method of claim 1, wherein the arrangement relationship is one of the plurality of key input devices, wherein the step of adjusting the audio signal is to correspond to the plurality of key input devices. The frequency of the audio signal of the key is adjusted to increase according to the order. The audio generating method of claim 1, further comprising: storing a plurality of device codes, wherein each of the plurality of device codes corresponds to each of the key input devices; wherein the plurality of key input devices are identified in the arrangement direction The step of arranging the relationship includes: identifying the device code of the adjacent plurality of key input devices; each of the keyboard input devices obtaining the device code of the adjacent key input device; and according to each of the adjacent plurality of keys The device code of the input device identifies the arrangement relationship of the plurality of keyboard input devices. The method for generating audio according to claim 1, further comprising: storing a plurality of device codes, wherein each of the plurality of device codes corresponds to each of the keyboard input devices; providing a detection platform having a plurality of placement regions; Separating each of the plurality of key input devices in each of the placement areas of the detection platform; wherein the step of identifying the arrangement relationship of the plurality of key input devices in the arrangement direction is to detect each of the placement areas The arrangement code of the keyboard input device recognizes the arrangement relationship. The method for generating audio according to claim 1, further comprising: providing a second signal connection capable of transmitting the audio signal to a first side and a second side of each of the keyboard input devices; The sound source is output on the first side; the plurality of key input devices are electrically connected via the two signal connections, so that the two adjacent key input devices of the plurality of key input devices have the first side and the second The sides are attached to each other, and only one of the sound source output ports is exposed; and the adjusted audio signal is output via the exposed sound source output. The method for generating audio according to claim 5, further comprising: providing a second signal connection for transmitting the audio signal to a first side and a second side of each of the keyboard input devices; The audio adjustment button is disposed on the second side; the plurality of key input devices are connected in series via the two signal connectors, so that the adjacent two keyboard input devices are attached to each other by the first side surface and the second side surface, and only Showing the audio adjustment button; and adjusting the frequency of the audio signal of each of the keyboard input devices in response to the pressing of the exposed audio adjustment button. A key input system includes: a plurality of key input devices, each of the key input devices comprising: a key set including a plurality of keys; an audio generator electrically connected to the key set to generate in response to pressing of the plurality of keys An audio signal; and a second signal port, electrically connected to the audio generator, wherein the corresponding two signal input devices of the plurality of key input devices are electrically connected to each other, so that the plurality of key input devices There is an arrangement relationship in which, when at least one of the plurality of keys is pressed, the audio generator adjusts the audio signal according to the arrangement relationship and the position of the pressed key and outputs the audio signal. The key input system of claim 8, wherein the audio signal is adjusted, and the frequency of the audio signal corresponding to the same key of the plurality of key input devices is a multiple relationship. The key input system of claim 8, wherein the signal connection system that is not connected to the other of the key input devices is disabled. The keyboard input system of claim 8, further comprising an electronic device, each of the keyboard input devices further comprising an audio source output port electrically connected to the audio generator to output the adjusted audio signal to The electronic device. The key input system of claim 11, wherein the sound source output of the electronic device is not disabled. The key input system of claim 8 further includes an electronic device, each of the keyboard input devices further comprising a wireless communication module electrically connected to the audio generator for transmitting the adjusted audio signal. To the electronic device. A keyboard type input device comprising: a key group including a plurality of first keys; an audio generator electrically connected to the key group in response to pressing of the plurality of first keys; and at least one signal connection port electrically connecting the audio a generator, wherein the signal port of the key input device is electrically connected to a signal port of another key input device such that an adjacent arrangement relationship between the two keyboard input devices is When at least one of the plurality of first keys is pressed, the audio generator adjusts a first audio signal according to the arrangement relationship and the position of the pressed first key and outputs the first audio signal. The keyboard-type input device of claim 14, wherein the audio input of the keyboard-type input device is generated when at least one of the plurality of second keys of the other keyboard-type input device is pressed The device adjusts a second audio signal according to the arrangement relationship and the position of the pressed second key, and outputs the second audio signal. The key input device of claim 15, wherein the frequency of the first audio signal corresponding to the first key and the adjusted frequency of the second audio signal corresponding to the second key of the same position are For a multiple relationship. The key input device of claim 15, further comprising an audio source output port electrically connected to the audio generator for outputting the adjusted first audio signal or the adjusted second audio signal At least one of them. The key input device of claim 15, further comprising a wireless communication module electrically connected to the audio generator for transmitting the adjusted first audio signal and the adjusted second audio signal At least one of them. The key input device of claim 14, wherein the signal port comprises a fixed structure and a connecting terminal, and the two key input devices are detachably connected via the fixing structure and transmitted through the connecting terminal The second audio signal. The key input device of claim 14, further comprising a table and a side cover, the side cover being removably coupled to one side of the table, the keyboard being disposed on the upper surface of the table a group, and the key group is adjacent to a side of the side cover and aligned with the connection between the seat and the side cover, wherein the signal connection port is disposed on a side of the seat adjacent to the side cover, Exposed after the side cover is removed.