简单的pygame的声音在频率 [英] Simple Pygame Audio at a Frequency

问题描述

如何创建，发挥永远顺利使用音频与pygame的一个440赫兹的声音？我想这应该是很容易的，但我不希望使用任何愚蠢的文件来完成任务。这样做的最终目的是当一个键被按下，因为我已经问了另一个问题来弹奏音符。任何帮助将大大AP preciated因为我已经浪费了时间大量试图寻找一个答案。

How can I create a 440 Hz sound that plays smoothly forever using audio with Pygame? I assume this should be easy enough, but I don't want to use any stupid files to accomplish the task. The final intent of this is to play a note while a key is being held down as I have asked in another question. Any help would be greatly appreciated as I have wasted great quantities of time trying to find an answer to this.

推荐答案

什么样的​​440赫兹的声音？还有在440赫兹，许多类型的波：正弦波，锯，广场等，你可以有一个长笛演奏的A，以及可能算过

What kind of 440 Hz sound? There are many types of waves at "440 Hz": sine, saw, square, etc. You could have a flute playing an A, and that might count too.

假设你想要一个正弦波，它看起来像你可以生成 pygame.sndarray.samples Sound对象。 （我没有测试这个）你可以创建样本：

Assuming you want a sine wave, it looks like you can generate a Sound object with pygame.sndarray.samples. (I haven't tested this) You can create the samples with:

samples = [math.sin(2.0 * math.pi * frequency * t / sample_rate) for t in xrange(0, duration_in_samples)]

这是希望基本正弦波的东西。 频率是所需的频率，单位为Hz。 SAMPLE_RATE 为样本/秒的生成的音频数：44100赫兹是一个典型的价值。 duration_in_samples 是音频的长度。 （5 * 44100 = = 5秒，如果你的声音是在44100赫兹的采样率。）

This is hopefully basic sine wave stuff. frequency is the desired frequency, in Hz. sample_rate is the number of samples / second in the generated audio: 44100 Hz is a typical value. duration_in_samples is the length of the audio. (5 * 44100 == 5 seconds, if your audio is at a 44100 Hz sample rate.)

看起来你可能传递到<$ C $之前样品转换为 numpy.array C> pygame.sndarray.samples 。该文档显示，音频应匹配 pygame.mixer.get_init 返回的格式，因此调整样品适当的，但这是最基本的理念。 （ mixer.get_init 会告诉你 SAMPLE_RATE 变量之上，以及是否需要考虑音响，如果你需要调整波的幅度或移位了。）

It looks like you might have to convert samples to a numpy.array before passing to pygame.sndarray.samples. The docs indicate that the audio should match the format returned by pygame.mixer.get_init, so adjust samples appropriately, but that's the basic idea. (mixer.get_init will tell you the sample_rate variable above, and whether you need to account for stereo, and if you need to adjust the amplitude of the wave or shift it.)

请样品长波的整数，它应该循环。

Make samples a integral number of waves long, and it should loop.

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