尝试使用基于微控制器的系统，比如Arduino。

在Java中，可以使用JMF (Java Media framework)来转换MIDI信号。 键盘设计的基本是易于使用，即用户界面;并把常用的字符/符号放在手边。

Java Sound Resources中的示例代码和API:示例:数字信号处理(DSP)有助于理解如何处理信号。

更多参考资料:

用控件处理音频 数字音频信号处理，第二版

要解决这个问题，你需要做一些事情:

A way to capture MIDI data from your keyboard. Depending upon the interface: MIDI interface (classic) or USB MIDI interface (modern) the most likely interface is to a computer as it provides the most options. USB host microcontrollers are not as simple as just using a computer. A scheme to convert MIDI data into keystrokes. Like one user pointed out, chords are the way to go as the number of keys will not be dependent upon the number of piano keys. A way to inject a key into the operating system. This will require a low-level driver to be accurate. I have played around with applications that inject keyboard and mouse data into applications in Windows 7, and it can be flaky and depend upon whether an application is currently in focus. This is hardest part of the interface. What may work is to create a HID USB keyboard microcontroller that also has a serial interface.

串行接口将创建一个虚拟串行端口。读取MIDI数据并产生击键的软件可以向虚拟串行端口发送一个串行消息。微控制器将发送一个击键，使它看起来像一个标准的键盘输入。这将允许同时连接MIDI端口和USB MIDI键盘。

Hmmm, with this type of interface you could also simulate a mouse and use some piano keys setup for the mouse axis and buttons. The pressure could be used to determine mouse pointer velocity. So you could eliminate the mouse as well. Another benefit of this approach is any type of input device you connect could talk to the virtual serial port to produce keyboard and mouse events. So if you wanted to add other hardware such as drum pedals or a joystick it would be a matter of adjusting the program that talks to the serial interface.

Another take on the above is like some posted above to use an Arduino, but also include USB Host Shield from Sparkfun to handle USB based music keyboards. This allows the Arduino to be programmed as a keyboard or keyboard mouse combo in the boot loader chip and allows the device to act a USB host for the USB based music keyboard. Then you are covered for both types. Although, I still think the virtual serial port method is more flexible and would be easier to program in the long run. The Arduino device will be harder to change than a desktop program or service.

还有另一种可能: 单手和弦键盘已经存在。我看过关于它们的视频，但你必须确定它们是否会伤害你的手。

使用. net DirectSound接口这样的东西来连接到MIDI设备应该是相当容易的。您需要识别目标MIDI设备，然后获取用于侦听传入消息的代码(有关于通过谷歌进行此操作的文章)。

由于您正在使用MIDI in作为键盘，因此基本上只需要检测两个MIDI消息，即打开和关闭。MIDI消息是三个数据字节，指定命令、音符和速度。note off只是音符号(有时“坏”MIDI堆栈以零速度发送音符，这也是你必须预料到的)。

一旦你有了转换它们的消息，从。net输出的键盘应该相当简单。

其他答案中有很多关于技术细节的建议;我只是想让你对实际的MIDI消息有一个概念。好运！

你可以用一个Teenys微控制器快速破解自己的USB键盘。

事实上，他们有如何制作USB键盘的示例代码。

你可以用两种方法来解决这个问题:

找一架旧钢琴，把开关直接连接到小钢琴上 添加额外的逻辑以连接到MIDI端口和必要的解码。

您可以在MIDI DotNet中使用。net中的源代码示例访问硬件。

创建MIDI notes数据流的完整工作示例是在VB 5/6-Tipp 0521中:MIDI-Töne erzeugen (Visual Basic 6.0，某处是.NET版本)

一种模拟键盘敲击的方法是在VB 5/6-Tipp 0155: Tastaturereignisse simulieren (Visual Basic 6.0，某处是.NET版本)

和识别击键在tip - upload: VB中有描述。NET 0266: Globaler KeyHook。

然后，为钢琴演奏者使用一个良好的工作矩阵

在钢琴上，如果你是一个优秀的演奏者，你可以有10个手指在键盘上，如果矩阵是可用的，我认为你可以比任何电脑键盘用户更快。: -)

在这种情况下，如果我没有理解错你的问题，这应该不是什么大事。