I started on signal processing with Digital Signal Processing. You can buy the book printed for around $30, or download the pdf for free. It's written for non-scientists, and contains a great deal of information to get you up and running with various signal processing techniques.
FFT (fast fourier transforms) will convert a time vs amplitude signal into a frequency (bins) vs the intensity (energy). You can go from frequency to a note via standard charts found on a lot of websites.
I've been working on a somewhat related project. You'll want to investigate fast fourier transforms. I can recommend this project written in C# - it's written as a guitar tuner but it can be easily modified to your purpose.
This however won't do multi-pitch. There is a product called "celemony" which claims to have this ability using "Direct Note Access (DNA)". Their technology is understandably closed source, but you may be able to license it at the right price.
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您可以使用傅里叶分析来提取波的组成频率。 这是一个相关的SO问题：Fast Fourier Transform in C#
You can use Fourier Analysis to extract the constituent frequencies of the wave. Here's a related SO question: Fast Fourier Transform in C#
我开始使用数字信号处理进行信号处理。 您可以花大约 30 美元购买印刷版的书，或者免费下载 pdf 版本。 它是为非科学家编写的，包含大量信息，可帮助您入门和运行各种信号处理技术。
FFT（快速傅里叶变换）会将时间与幅度信号转换为频率（频率）与强度（能量）。 您可以通过在许多网站上找到的标准图表从频率转到注释。
I started on signal processing with Digital Signal Processing. You can buy the book printed for around $30, or download the pdf for free. It's written for non-scientists, and contains a great deal of information to get you up and running with various signal processing techniques.
FFT (fast fourier transforms) will convert a time vs amplitude signal into a frequency (bins) vs the intensity (energy). You can go from frequency to a note via standard charts found on a lot of websites.
我一直在从事一个有点相关的项目。 您需要研究快速傅立叶变换。 我可以推荐这个用 C# 编写的项目 - 它是作为吉他编写的调谐器，但它可以根据您的目的轻松修改。
然而，这不会进行多音高。 有一个名为“celemony”的产品，声称使用“Direct Note Access (DNA ）”。 可以理解，他们的技术是闭源的，但您也许可以以合适的价格获得其许可。
I've been working on a somewhat related project. You'll want to investigate fast fourier transforms. I can recommend this project written in C# - it's written as a guitar tuner but it can be easily modified to your purpose.
This however won't do multi-pitch. There is a product called "celemony" which claims to have this ability using "Direct Note Access (DNA)". Their technology is understandably closed source, but you may be able to license it at the right price.