分类
技术分析

About the CPU of the new 12-inch MacBook

Apple just released its Early-2016 iteration of the 12-inch MacBook. In addition to the new pink (rose gold =_=) option, they swapped the processor from Broadwell Core m to the new Skylake Core m, namely the Core m3, m5 and m7, as shown below.

 

One interesting point about this is that the price of Core m3 and m5 are identical, despite the ~$200 price bump when buying from Apple. Although it is possible that Apple managed to force Intel to drop the price of Core m3 when they were buying them from Intel, it is more likely a pure marketing strategy due to the irrelevancy between price and cost.

 

Also according to Intel’s ARK database, the base frequency of these processors (900MHz, 1.1GHz, 1.2GHz)  are different from what Apple claimed on its website (1.1GHz, 1.2GHz, 1.3GHz), but the Turbo Boost frequency stayed the same. Considering the massive Turbo Boost headroom of Core m processors, it is possible that Apple clocked them 100MHz higher due to its confidence on the MacBook’s thermal capacity.

 

Another interesting point is about the TDP. While the TDP and the maximum configurable TDP of these processors are identical, the minimum configurable TDP of Core m3 is slightly higher than its brothers.

One big feature of the Core m lineup is its variable TDP. The manufacture could change the processor’s target TDP to adapt to the product’s form factor and thermal design, thus altering the performance thereof. Because of this flexibility, the “Core m” brand couldn’t make any guarantee on the performance’s side, for a higher-clocked Core m3 with better cooling can perform well better than a poorly-cooled Core m7.

In this regard, although the minimum TDP of Core m3 is higher than m5 and m7:

  • it won’t affect shit,
  • actually this might just be a typo from Intel.

 

As Intel stated, all three of these Core m processors support video output at 2160p@60Hz via DP or eDP. But when using HDMI as the output tunnel, limited by HDMI 1.4, it can only output video up to 4K@30Hz.

 

But according to Apple’s tech specs, the 12-inch MacBook can only output video at up to 2160p@30Hz. It’s safe to say that the MacBook “can’t work with” a 4K monitor because almost no one want there screen refresh rate to be limited to 30 Herts. Here’re three possible causes:

  • It’s limited by the Intel HD Graphics driver in OS X,
  • Apple doesn’t sell USB-C to DP adapter. What Apple offers is a USB-C to HDMI adapter (along with a USB-A female port and a USB-C female port for power), which,  limited by the data rate of HDMI 1.4,  can only achieve 4K@30Hz. However technically, it is possible to achieve 4K@60Hz via the USB-C’s native support of DisplayPort 1.2. Although it remains to be tested.
  • The USB-C port that MacBook utilizes is of USB 3.1 Gen-1, with maximum data speed of 5Gbps, whereas a typical 4K@60Hz video signal (with overhead) is at about 15Gbps, far exceeding the capacity of USB.
分类
技术分析

粗看 Android N 的分屏功能

Google 就这么静悄悄地发布了 Android N 的预览版。其实在多任务处理上,Android 一直都比其他移动平台更加先进,此次加入分屏之后更是如此。

严格来说,多窗口的功能是几十年前苹果 Macintosh 先提供的,但却是三星首先让移动平台享受这个功能。三星为了卖大屏手机,几乎一手研发了 Android 的分屏功能,随后又移植到平板上。因为 TouchWiz 本身就是 Android,这种功能实现也让人发现在 Android 上实现分屏其实没有想象中的那么难。

要不是 Windows 和 iOS 率先实现了这个功能的话。

先不说 Windows(这个生产力怪兽)。iOS 长久以来被人嘲笑一根筋,屏幕都 9.7 寸了还是只能同时做一件事。但是就在发布 12.9 寸(😂)iPad 之前,苹果给 iOS 9 加入了分屏和小窗口的功能。

分类
技术分析

A Tiny Glimpse on Android N’s Multi-Window Feature

With Google’s quiet announcement of Android N brings long-waited multi-windows feature for Android. Many considered Google’s implementation of multi-tasking is way superior to any other platforms, and that was true, and that is even more so.

Multi-window functionality, technically, is brought to the world by Apple with its original Macintosh launch, but the one who first brought the feature to mobile platform is Samsung. Samsung singlehandedly developed a multi-window multi-tasking feature for its Galaxy Note lineup in order to push sales, and the feature was later introduced to Galaxy Tab. Since TouchWiz is based on Android, many considered that this is the first sign that multi-tasking on Android is perfectly possible.

分类
设计 学习 开发 技术分析

脑残安卓:状态栏

这是一系列介绍 Android 脑残特性的文章。Android 是一个满载先进科技的系统,同时也是一个充满碎片化、设计缺陷和执行缺陷的缺陷系统。

本篇文章针对 Android 对于状态栏的处理。

分类
视角 评测 技术分析

Bose QuietComfort 25

简介

Bose 在音频设备界也是相当有名气的,但是它的名声与老牌大厂森海塞尔、铁三角等等专精音质的风格不太一样,一直以来我都把 Bose 看成一个敢玩的公司。为什么这么说?因为 Bose 家的东西充斥着黑科技,很多东西都是独一无二的。比如小体积大嗓门的 SoundLink mini 和 Music Monitor,比如把环绕音响直接做到屏幕里面的 Bose Videowave(已停产),比如今天的主角 QuietComfort 主动式降噪耳机。这些产品中很少有哪个可以归到传统音频产品这一类之中的,似乎 Bose 也无意与传统音频行业抢市场,“用黑科技塑造品牌”似乎就是他们的经营信条。

Bose QuietComfort 25 是 Bose 2015 年的主动式降噪全新力作。作为前辈 QC15 的继任,新一代产品重新进行了工业设计,带来了全新的外观,改进了供电方式,并且加入了断电听歌的能力。在各大评测网站上,QC25 获得了最佳主动降噪耳机的称号,甚至有文章称 QC25 被用于航天领域,让宇航员来隔绝宇宙噪音。是真是假,营销伎俩还是能力出众,这篇文章一见分晓。同样是以隔音为主的耳机,被动降噪的典型 Shure SE215 可以参考之前的评测