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[#]: collector: (lujun9972)
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[#]: translator: (wxy)
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[#]: reviewer: ( )
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[#]: publisher: ( )
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[#]: url: ( )
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[#]: subject: (Turn your Raspberry Pi into a HiFi music system)
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[#]: via: (https://opensource.com/article/21/1/raspberry-pi-hifi)
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[#]: author: (Peter Czanik https://opensource.com/users/czanik)
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Turn your Raspberry Pi into a HiFi music system
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======
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Play music for your friends, family, co-workers, or anyone else with an
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inexpensive audiophile setup.
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![HiFi vintage stereo][1]
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For the past 10 years, I've worked remotely most of the time, but when I go into the office, I sit in a room full of fellow introverts who are easily disturbed by ambient noise and talking. We discovered that listening to music can suppress office noise, make voices less distracting, and provide a pleasant working environment with enjoyable music.
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Initially, one of our colleagues brought in some old powered computer speakers, connected them to his desktop, and asked us what we wanted to listen to. It did its job, but the sound quality wasn't great, and it only worked when he was in the office. Next, we bought a pair of Altec Lansing speakers. The sound quality improved, but flexibility did not.
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Not much later, we got a generic Arm single-board computer (SBC). This meant anyone could control the playlist and the speakers over the network using a web interface. But a random Arm developer board meant we could not use popular music appliance software. Updating the operating system was a pain due to a non-standard kernel, and the web interface broke frequently.
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When the team grew and moved into a larger room, we started dreaming about better speakers and an easier way to handle the software and hardware combo.
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To solve our issue in a way that is relatively inexpensive, flexible, and has good sound quality, we developed an office HiFi with a Raspberry Pi, speakers, and open source software.
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### HiFi hardware
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Having a dedicated PC for background music is overkill. It's expensive, noisy (unless it's silent, but then it's even more expensive), and not environmentally friendly. Even the cheapest Arm boards are up to the job, but they're often problematic from the software point of view. The Raspberry Pi is still on the cheap end and, while not standards-compliant, is well-supported on the hardware and the software side.
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The next question was: what speakers to use. Good-quality, powered speakers are expensive. Passive speakers cost less but need an amplifier, and that would add another box to the setup. They would also have to use the Pi's audio output; while it works, it's not exactly the best, especially when you're already spending money on quality speakers and an amplifier.
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Luckily, among the thousands of Raspberry Pi hardware extensions are amplifiers with built-in digital-analog converters (DAC). We selected [HiFiBerry's Amp][2]. It was discontinued soon after we bought it (replaced by an Amp+ model with a better sample rate), but it's good enough for our purposes. With air conditioning on, I don't think you can hear the difference between a DAC capable of 48kHz or 192kHz anyway.
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For speakers, we chose the [Audioengine P4][3], which we bought when a shop had a clearance sale with extra-low prices. It easily fills our office room with sound without distortion (and fills much more than our room with some distortion, but neighboring engineers tend to dislike that).
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### HiFi software
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Maintaining Ubuntu on our old generic Arm SBC with a fixed, ancient, out-of-packaging system kernel was problematic. The Raspberry Pi OS includes a well-maintained kernel package, making it a stable and easily updated base system, but it still required us to regularly update a Python script to access Spotify and YouTube. That was a little too high-maintenance for our purposes.
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Luckily, using the Raspberry Pi as a base means there are many ready-to-use software appliances available.
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We settled on [Volumio][4], an open source project that turns a Pi into a music-playing appliance. Installation is a simple _next-next-finish_ process. Instead of painstakingly installing and maintaining an operating system and regularly debugging broken Python code, installation and upgrades are completely pain-free. Configuring the HiFiBerry amplifier doesn't require editing any configuration files; you can just select it from a list. Of course, getting used to a new user interface takes some time, but the stability and ease of maintenance made this change worthwhile.
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![Volumio interface][5]
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Screenshot courtesy of [Volumeio][4] (© Michelangelo Guarise)
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### Playing music and experimenting
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While we're all working from home during the pandemic, the office HiFi is installed in my home office, which means I have free reign over what it runs. A constantly changing user interface would be a pain for a team, but for someone with an R&D background, playing with a device on my own, change is fun.
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I'm not a programmer, but I have a strong Linux and Unix sysadmin background. That means that while I find fixing broken Python code tiresome, Volumio is just perfect enough to be boring for me (a great "problem" to have). Luckily, there are many other possibilities to play music on a Raspberry Pi.
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As a terminal maniac (I even start LibreOffice from a terminal window), I mostly use Music on Console ([MOC][6]) to play music from my network-attached storage (NAS). I have hundreds of CDs, all turned into [FLAC][7] files. And I've also bought many digital albums from sources like [BandCamp][8] or [Society of Sound][9].
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Another option is the [Music Player Daemon (MPD)][10]. With it running on the Raspberry Pi, I can interact with my music remotely over the network using any of the many clients available for Linux and Android.
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### Can't stop the music
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As you can see, the possibilities for creating an inexpensive HiFi system are almost endless on both the software and the hardware side. Our solution is just one of many, and I hope it inspires you to build something that fits your environment.
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--------------------------------------------------------------------------------
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via: https://opensource.com/article/21/1/raspberry-pi-hifi
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作者：[Peter Czanik][a]
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选题：[lujun9972][b]
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译者：[译者ID](https://github.com/译者ID)
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校对：[校对者ID](https://github.com/校对者ID)
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本文由 [LCTT](https://github.com/LCTT/TranslateProject) 原创编译，[Linux中国](https://linux.cn/) 荣誉推出
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[a]: https://opensource.com/users/czanik
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[b]: https://github.com/lujun9972
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[1]: https://opensource.com/sites/default/files/styles/image-full-size/public/lead-images/hi-fi-stereo-vintage.png?itok=KYY3YQwE (HiFi vintage stereo)
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[2]: https://www.hifiberry.com/products/amp/
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[3]: https://audioengineusa.com/shop/passivespeakers/p4-passive-speakers/
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[4]: https://volumio.org/
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[5]: https://opensource.com/sites/default/files/uploads/volumeio.png (Volumio interface)
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[6]: https://en.wikipedia.org/wiki/Music_on_Console
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[7]: https://xiph.org/flac/
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[8]: https://bandcamp.com/
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[9]: https://realworldrecords.com/news/society-of-sound-statement/
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[10]: https://www.musicpd.org/
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@ -0,0 +1,83 @@
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[#]: collector: (lujun9972)
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[#]: translator: (wxy)
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[#]: reviewer: ( )
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[#]: publisher: ( )
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[#]: url: ( )
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[#]: subject: (Turn your Raspberry Pi into a HiFi music system)
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[#]: via: (https://opensource.com/article/21/1/raspberry-pi-hifi)
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[#]: author: (Peter Czanik https://opensource.com/users/czanik)
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把你的树莓派变成一个 HiFi 音乐系统。
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======
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> 为你的朋友、家人、同事或其他任何拥有廉价发烧设备的人播放音乐。
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![HiFi 复古立体声][1]
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在过去的 10 年里，我大部分时间都是远程工作，但当我走进办公室时，我坐在一个充满内向的同伴的房间里，他们很容易被环境噪音和谈话所干扰。我们发现，听音乐可以抑制办公室的噪音，让声音不那么扰人，用愉快的音乐提供一个愉快的工作环境。
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起初，我们的一位同事带来了一些老式的有源电脑音箱，把它们连接到他的桌面上，然后问我们想听什么。它可以工作，但音质不是很好，而且只有当他在办公室的时候才可以使用。接下来，我们又买了一对 Altec Lansing 音箱。音质有所改善，但没有什么灵活性。
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不久之后，我们得到了一台通用 ARM 单板计算机（SBC），这意味着任何人都可以通过 Web 界面控制播放列表和扬声器。但一块普通的 ARM 开发板意味着我们不能使用流行的音乐设备软件。由于非标准的内核，更新操作系统是一件很痛苦的事情，而且 Web 界面也经常出现故障。
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当团队壮大并搬进更大的房间后，我们开始梦想着有更好的扬声器和更容易处理软件和硬件组合的方法。
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为了用一种相对便宜、灵活、音质好的方式解决我们的问题，我们用树莓派、音箱和开源软件开发了一个办公室 HiFi。
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### HiFi 硬件
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用一个专门的 PC 来播放背景音乐就有点过分了。它昂贵、嘈杂（除非是静音的，但那就更贵了），而且不环保。即使是最便宜的 ARM 板也能胜任这个工作，但从软件的角度来看，它们往往存在问题。树莓派还是比较便宜的，虽然不符合标准，但在硬件和软件方面都有很好的支持。
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接下来的问题是：用什么音箱。质量好的、有源的扬声器很贵。无源音箱的成本较低，但需要一个放大器，这将为这套设备增加另一个盒子。它们还必须使用树莓派的音频输出；虽然可以工作，但并不是最好的，特别是当你已经在高质量的扬声器和放大器上投入资金的时候。
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幸运的是，在数以千计的树莓派硬件扩展中，有内置数字模拟转换器（DAC）的放大器。我们选择了 [HiFiBerry 的 Amp][2]。它在我们买来后不久就停产了（被采样率更好的 Amp+ 型号取代），但对于我们的目的来说，它已经足够好了。在开着空调的情况下，我想无论如何你也听不出能达到 48kHz 或 192kHz 的 DAC 有什么不同。
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音箱方面，我们选择了 [Audioengine P4][3]，是在某店家清仓大甩卖的时候买的，价格超低。它很容易让我们的办公室房间充满了声音而不失真（并且还不止充满了我们的房间，有一些失真，而邻居的工程师往往不喜欢）。
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### HiFi 软件
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在我们旧的通用 ARM SBC 上我们需要维护一个 Ubuntu，使用一个固定的、古老的、在软件包仓库外的系统内核，这是有问题的。树莓派操作系统包括一个维护良好的内核包，使其成为一个稳定且易于更新的基础系统，但它仍然需要我们定期更新 Python 脚本来访问 Spotify 和 YouTube。对于我们的目的来说，这有点过于高维护。
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幸运的是，使用树莓派作为基础意味着有许多现成的软件设备可用。
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我们选择了 [Volumio][4]，这是一个将树莓派变成音乐播放设备的开源项目。安装是一个简单的*一步步完成*的过程。安装和升级是完全无痛的，而不用辛辛苦苦地安装和维护一个操作系统，并定期调试破损的 Python 代码。配置 HiFiBerry 放大器不需要编辑任何配置文件，你只需要从列表中选择即可。当然，习惯新的用户界面需要一定的时间，但稳定性和维护的便捷性让这个改变是值得的。
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![Volumio interface][5]
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### 播放音乐并体验
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虽然大流行期间我们都在家里办公，但办公室的 HiFi 安装在我家的办公室里，这意味着我可以自由支配它的运行。一个不断变化的用户界面对于一个团队来说会很痛苦，但对于一个有研发背景的人来说，自己玩一个设备，变化是很有趣的。
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我不是一个程序员，但我有很强的 Linux 和 Unix 系统管理背景。这意味着，虽然我觉得修复坏掉的 Python 代码很烦人，但 Volumio 对我来说却足够完美，足够无聊（这是一个很好的“问题”）。幸运的是，在树莓派上播放音乐还有很多其他的可能性。
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作为一个终端狂人（我甚至从终端窗口启动 LibreOffice），我主要使用 Music on Console（[MOC][6]）来播放我的网络存储（NAS）中的音乐。我有几百张 CD，都变成了 [FLAC][7] 文件。而且我还从 [BandCamp][8] 或 [Society of Sound][9] 等渠道购买了许多数字专辑。
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另一个选择是 [音乐播放器守护进程（MPD）][10]。把它运行在树莓派上，我可以通过网络使用 Linux 和 Android 的众多客户端之一与我的音乐进行远程交互。
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### 音乐不停歇
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正如你所看到的，创建一个廉价的 HiFi 系统的可能性在软件和硬件方面几乎是无限的。我们的解决方案只是众多解决方案中的一个，我希望它能启发你建立适合你环境的东西。
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--------------------------------------------------------------------------------
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via: https://opensource.com/article/21/1/raspberry-pi-hifi
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作者：[Peter Czanik][a]
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选题：[lujun9972][b]
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译者：[wxy](https://github.com/wxy)
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校对：[校对者ID](https://github.com/校对者ID)
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本文由 [LCTT](https://github.com/LCTT/TranslateProject) 原创编译，[Linux中国](https://linux.cn/) 荣誉推出
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[a]: https://opensource.com/users/czanik
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[b]: https://github.com/lujun9972
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[1]: https://opensource.com/sites/default/files/styles/image-full-size/public/lead-images/hi-fi-stereo-vintage.png?itok=KYY3YQwE (HiFi vintage stereo)
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[2]: https://www.hifiberry.com/products/amp/
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[3]: https://audioengineusa.com/shop/passivespeakers/p4-passive-speakers/
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[4]: https://volumio.org/
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[5]: https://opensource.com/sites/default/files/uploads/volumeio.png (Volumio interface)
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[6]: https://en.wikipedia.org/wiki/Music_on_Console
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[7]: https://xiph.org/flac/
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[8]: https://bandcamp.com/
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[9]: https://realworldrecords.com/news/society-of-sound-statement/
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[10]: https://www.musicpd.org/
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