Rust implementation of CP-16 (spectrum waterfall chart displaying Chinese characters)

SuperBart

CP-16 介绍：https://www.hellocq.net/forum/read.php?tid=345437
程序代码：https://github.com/BenderBlog/cp16-rs

README：

CP-16 本质上就是 16 个正弦波叠加，用于直接在频谱图上显示汉字。我觉得这个东西就是某种最简单的正弦波叠加。如果使用复杂模式，比如说更加密集的频率，那就是 CTF Misc 题目，还有 DOOM 2016 中制作人留下的“我爱上帝”彩蛋。

目前本程序通过生成 16 个 PCM 正弦波进行叠加，初步实现了该编码方式，同时添加了初始生成频率，生成间隔，处理横向字符生成等功能。接下来需要写成一个库。在这个库的基础上，编写程序使其可以实时播放或者写入文件。

本程序依赖 GNU Unifont 库，不打算支持外部引入字体。GNU Unifont 库支持 Unicode Basic Mulitlingual Plane，也就是基本上常见的字体都能支持。

顺便，用这个程序学下 rust 的迭代器。

附注：

当时我看一个群聊，有人说想搞这个。我一看这个就是 16 个正弦波叠加就感觉很快了（之前我看有个很简单的 SSTV 生成器，就是 PCM 直接生成正弦波计算），就很快写了个原型。后来我想学 Rust 的迭代器（利于实际计算），就重新写了下。感觉现在应该可以用了。后面应该还会写，但是写到啥程度，天知道。

SuperBart

Currently, command-line software has been implemented.

(base) superbart@superbart-laptop [ cp16-cli@master ] $ cargo run -- --help
   Compiling cp16-cli v0.1.0 (/home/superbart/RustroverProjects/cp16-rs/cp16-cli)
    Finished `dev` profile [unoptimized + debuginfo] target(s) in 1.83s
     Running `/home/superbart/RustroverProjects/cp16-rs/target/debug/cp16-cli --help`
Usage: cp16-cli [OPTIONS] --start-freq <START_FREQ> -- step <STEP> <TEXT>

Arguments:
  <TEXT>  String to be transferred to CP-16

Options:
      --sample-rate <SAMPLE_RATE>      Sample Rate [default: 8000]
      --start-freq <START_FREQ>        Start Frequency
      --step <STEP>                    Frequency Step
      --disable-vertical Disable horizontal character display on waterfall plot
      --time-per-font <TIME_PER_FONT>  Display time for a full-width character [default: 1.5]
      --path <PATH>                    Path to store the wave file
  -h, --help                           Print help
(base) superbart@superbart-laptop [ cp16-cli@master ] $

This only explains `disable-vertical`: By default, the font will be displayed as it appears vertically in the waterfall chart. If this is set, it adapts to a horizontal display of the spectrum chart, similar to the effect shown in the image below.

Okay, I think we're almost done. It would be better to implement a phase-shift filter, so I'll take a look at that. There's also a GUI; I'll ask the AI to help me with that too.

Programming-related: You still need to learn about threads. I was initially struggling because of my poor grades on operating system exams, which led to debt...

BI3TTR

SuperBart Brazilian friend: I must have just woken up; how am I seeing words?

BI1XJT

SuperBart "I think using a rising cosine filter would be better," but this needs to be smoothed out, otherwise there will be key clicks similar to those heard in CW transmissions. In the past, when old radio stations transmitted CW, you could hear a distinct "click-click-click" sound when the key was pressed and released. Modern radios have envelope followers that prevent the amplitude from suddenly increasing, so there are no key clicks.

This manifests as significant dispersion when switching carriers, but the spectrum quickly becomes clean again after a short period.

BG0EXN

Here it comes! Here it comes! ^O^/

Ken

BI3TTR Is it possible that this is Zito from Three-Body?

arwoon

Is it possible to create an Android version of CP16? This would allow me to send CP16 messages from my phone, without needing a computer.

BI1XJT

arwoon I think it has potential, so I've added it to my "To Do" list.

SuperBart

arwoon Yes, it can be implemented using Flutter.

arwoon

Since CP16 was first released, it feels like about 10 years have passed. There haven't been any updates or improvements. It's a great product, but unfortunately, it can't be used on multiple platforms.

BI1XJT

BI1XJT Create a flag, and today I'll demonstrate an Android app.

bg7xwf

I support continuing improvements and hope that portable launch systems will become a reality.

Bi4KKF

Please keep an eye on it; does the audio spectrum software on the second floor have a link?

Bi4KKF

I have an app on my phone called "Spectrogram." This app can display the CP16 audio I receive on my phone, and it seems to function similarly to a mobile audio analysis tool. If you're interested, feel free to add me on WeChat; just search for my QR code. I'll send you the app so you can try it out.

BG9JDI

Good stuff, mark.

BI4PYM

I mentioned using a sine wave filter because I have existing code in my UniHELL project that I can reference.

SuperBart

I've created a UI, but it's currently missing the pause function. I asked an AI, but it didn't provide the answer:P

SuperBart

SuperBart https://github.com/BenderBlog/cp16_flutter/releases/tag/1.0.0-20251123

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