signal-to-noise compromise这是什么意思
时间: 2023-12-11 18:02:38 浏览: 156
Signal-to-noise compromise(信噪比折衷)是指在某些情况下,为了提高信号的质量,必须减少噪声的干扰,但是这可能会导致信号的损失。因此,需要在信号和噪声之间进行权衡或折衷,以获得最佳的结果。例如,在音频或视频传输中,为了减少噪声,可以使用降噪算法,但这可能会导致信号的一些细节被损失。在设计电子电路时,也需要权衡信号和噪声之间的关系以获得最佳的性能。
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Grbl is a no-compromise, high performance, low cost alternative to parallel-port-based motion control for CNC milling. This version of Grbl runs on an Arduino with a 328p processor (Uno, Duemilanove, Nano, Micro, etc). The controller is written in highly optimized C utilizing every clever feature of the AVR-chips to achieve precise timing and asynchronous operation. It is able to maintain up to 30kHz of stable, jitter free control pulses.翻译
Grbl是一种高性能、低成本的替代并口运动控制的解决方案,可用于CNC铣削。这个版本的Grbl运行在带有328p处理器的Arduino板上(如Uno、Duemilanove、Nano、Micro等)。控制器使用高度优化的C语言编写,利用了AVR芯片的每一个巧妙特性,实现了精确的定时和异步操作。它能够维持高达30kHz稳定、无抖动的控制脉冲。
One of the configured repositories failed (未知), and yum doesn't have enough cached data to continue. At this point the only safe thing yum can do is fail. There are a few ways to work "fix" this: 1. Contact the upstream for the repository and get them to fix the problem. 2. Reconfigure the baseurl/etc. for the repository, to point to a working upstream. This is most often useful if you are using a newer distribution release than is supported by the repository (and the packages for the previous distribution release still work). 3. Run the command with the repository temporarily disabled yum --disablerepo=<repoid> ... 4. Disable the repository permanently, so yum won't use it by default. Yum will then just ignore the repository until you permanently enable it again or use --enablerepo for temporary usage: yum-config-manager --disable <repoid> or subscription-manager repos --disable=<repoid> 5. Configure the failing repository to be skipped, if it is unavailable. Note that yum will try to contact the repo. when it runs most commands, so will have to try and fail each time (and thus. yum will be be much slower). If it is a very temporary problem though, this is often a nice compromise: yum-config-manager --save --setopt=<repoid>.skip_if_unavailable=true Cannot find a valid baseurl for repo: base/7/x86_64
这个错误通常表示你的系统无法连接到配置的软件源,导致yum无法获取所需的软件包信息。这可能是由于网络连接问题、软件源配置错误或配置的软件源不再可用等原因引起的。
解决此问题的方法有几种:
1. 确保网络连接正常:检查系统的网络连接是否正常,并确保可以访问互联网。你可以尝试使用ping命令测试网络连接。
2. 检查软件源配置:检查你的软件源配置文件,通常位于`/etc/yum.repos.d/`目录下。确保每个软件源配置文件中的`baseurl`或`mirrorlist`设置正确,并指向有效的软件源地址。
3. 检查软件源可用性:访问软件源的URL,确认该软件源是否可用。如果软件源不再可用,你可以考虑更换为其他可用的软件源。
4. 临时禁用问题软件源:使用`yum --disablerepo=<repoid>`命令运行yum命令时,临时禁用问题软件源。例如,使用`yum --disablerepo=base`禁用名为"base"的软件源。
5. 永久禁用问题软件源:使用`yum-config-manager --disable <repoid>`命令永久禁用问题软件源。例如,使用`yum-config-manager --disable base`禁用名为"base"的软件源。
6. 配置软件源跳过不可用:使用`yum-config-manager --save --setopt=<repoid>.skip_if_unavailable=true`命令配置跳过不可用的软件源。例如,使用`yum-config-manager --save --setopt=base.skip_if_unavailable=true`配置名为"base"的软件源跳过不可用。
请注意,具体的解决方法可能因具体情况而异,你可以根据实际情况选择适合的方法进行尝试。如果问题仍然存在,你可能需要进一步调查或寻求系统管理员或技术支持的帮助。
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