Mido midi - 如果我在键盘上弹奏，发现的 Note_On 事件是在钢琴卷帘中绘制音符的两倍......？

Question

我编写了一个程序来解析 midi 文件并找到所有 Note_On 事件。

我进入我的 DAW 钢琴卷并 在 D4、D5、F4

中绘制

我的程序正确找到了 Note_One 个事件并正确识别了它们。

然后我用我的 midi 键盘演奏完全相同的音符，并保存 midi 文件。

我的程序找到，D4,D4,D5,D5,F4,F4

即它使音符加倍！为什么我得到不同的结果？两个 MIDI 文件在 DAW 中看起来一样：它们都有三个音符。

这是两个 MIDI 文件：

https://drive.google.com/drive/folders/1CUgTJNH-jD5rPJEmT0aSwRp4PhaatxYq?usp=sharing

这是我从文件中读取 Midi 数据的代码：

for i, track in enumerate(Ians_midi.tracks):
    for msg in track:
        if msg.type == 'note_on':   ...

Answer 1

MIDI 规范说：

MIDI provides two roughly equivalent means of turning off a note (voice). A note may be turned off either by sending a Note-Off message for the same note number and channel, or by sending a Note-On message for that note and channel with a velocity value of zero. The advantage to using "Note-On at zero velocity" is that it can avoid sending additional status bytes when Running Status is employed.

Due to this efficiency, sending Note-On messages with velocity values of zero is the most commonly used method. However, some keyboard instruments implement release velocity where a Note-Off code (8nH) accompanied by a "velocity off" byte is used. A receiver must be capable of recognizing either method of turning off a note, and should treat them identically.

所以当你收到 note_on 消息时，你还必须检查它的 velocity。

Mido midi - 如果我在键盘上弹奏，发现的 Note_On 事件是在钢琴卷帘中绘制音符的两倍......？

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