Monday, February 29, 2016

Tweaking Panasonic RP-HC56 Noise Cancelling Earbuds

It was on sale in B&H for $25 so I got a pair (two actually).


Sound is smooth and sweet with strong lows, but too much bass and too dark to be audiophile level like the Philips SHE3010 and Koss KSC/35. However, this type of sound signature should be very suitable for noisy environment where bass usually disappears entirely. Much better sounding than I expected, sound well good enough.

When my Nexus 6 is plugged in to the charger (even charging is stopped), there is a hum noise.

It has a volume slide, but sluggish and the adjustment range is very limited. With it all way down, there is still music come out. Better than without.

The battery holder is very light, but much longer than I thought, double the length of an AAA (see above photo).

It is quite comfortable, because the silicon tips do not apply much pressure and do not go deep. I think I can use even smaller tips that are included, as the bass is already too much. With Philips SHE 3590, the tips must be large enough to provide enough seal to stay and sound good, and thus not comfortable.

The buds are bulky and seem very durable (good). They stay very securely in my ears (good), the most secure buds so far.

The wire between the battery and buds is not long enough to belt it to your hip, must be around your chest and upper stomach. Not a big issue to me, I simply use a clip as showing in this photo.


Went for a bus ride, noise cancelling was ideal, got the engine totally down to the bottom. Those who say the NC was not effective don't know what they were talking about, they were talking about anti baby crying. Or the tips are not big enough for their ears.

I changed the tips to the smallest, sound became perfect and crispy, no more too much bass. However, engine noise became apparent. Totally comfortable though, I easily forget their existence.

I then changed to the large tips, not comfortable and too much bass.


So, it seems the small tips are best for not too noisy situations. Maybe something a little larger would be perfect.

Later I found that the small tips fit my right ear perfectly - good sound, good seal and good NC, but the left side is loose. So I have to use the medium tip for left and small for right to achieve the best result.

Then, I inserted a foam ring into the left tip for a tighter fit:


I then made two small foam tips from ear plugs, but they don't sound good and not even comfortable. I cut the foam tips even shorter and now everything is as perfect as life can be:



More comfortable and much better NC than the stock tips especially on isolating middle and high freq. noise such as baby crying. I might cut off another 1mm, that's about the extreme. At this moment I don't feel excessive bass, but I still wish the sound more bright to give a feel of audiophile level.

The best thing about these buds so far is how steady they hold on. With all other earbuds, I keep pushing them in to retain good sound, like people always raising their eye glasses.

It is extraordinarily windy here today, but these buds are doing a fantastic job on that. So, they must be ideal for my motorcycle riding too; engine, road and strong wind, all of these nasty noises will become a thing of past. See how strong is the wind:


Battery life is excellent. I'm using a 1000mAh NiMH, it works continuously for 18 hours. At the end, the battery shows its end with some popcorn popping and the red light becomes dim. [Note: this is a Duracell battery, a good battery should last much longer] [update: yes, a RayoVac ready-to-use rechargeable played a whopping 55 hours continuously, never buy anything Duracell!]

There is a tiny pimple on the left handle for you to easily distinguish the left bud from the right without looking at them.

Saturday, February 20, 2016

Tweaks for iStereo

I bought this iStereo clock radio from Walmart several years ago for only $30. Although priced low to the bottom, it is actually a high-end box with very good material and building quality in and out. The sound is not great but not bad at all.


 Why such a high-end box sold for so cheap? Mostly due to its unique feature or design flaw: it detects input audio level and, if audio level is low enough for several minutes, it turns off the power.


The fix is very simple. You may even add a switch to enable and disable this feature. See this video for details:



Another bad thing, learned from Bose Wave, is that it cannot do anything without a remote. And, the remote uses a button battery that's expensive and does not last long. So I had to do this as well, as always, for anything that uses unnecessarily button batteries:




Thursday, February 18, 2016

Tweaking Google Cardboard for Virtual Theater

[This article is still in progress]

In Chinese:

这几天在玩一个很有意思的东西:Google Cardboard (谷歌虚拟实境装置)。名字取的很偏颇,其实这东西除了虚拟实境,也可以做虚拟影院(3D/2D),而且虚拟影院才是这东西目前能实用的功能。

虚拟实境听起来很酷,其实非常的虚,不实用。首先,只要看上几秒钟,接下来一天都是晕的。另外耗电非常厉害,手机发热巨大。为了达到全身心沁入的境地,镜片的焦距很短(45毫米),也就是过度放大,屏幕的颗粒太大。

做虚拟影院倒是非常完美。屏幕巨大,真的有电影院里面的屏幕那么大(也许更大)。因为焦距比较长(60毫米),感觉离屏幕比较远,大约是电影院里坐在10多排以后的感觉,比现在最大的彩电要大好多倍。因为没有过度放大,看起来没有颗粒,很清晰平滑。看视频或网络电视的时候,手机不热,耗电也正常,因为不需要虚拟实境那种特殊的实时处理。

淘宝上应该很多,很便宜,10至20美金。注意焦距要是60mm的,45mm的不行(比如苹果卖的View-Master,除非是要做虚拟实境用);要支持6寸屏幕的;最好有绷带可以戴头上。比如Destek和Sunnypeak,前者不可以调焦距,但是可以把镜片取出来用双面胶贴在前面(老花眼)或背面(近视眼)就可以了;后者焦距和瞳孔间距都可调,镜片好(不是锯齿型的),但是手机的按放不是很理想(不容易对中)。

手机最好是5寸或以上的屏幕,分辨率最好1080p以上,2K最佳。比如Nexus 6,6寸,2K,美国卖的很便宜,250美金左右,效果极佳。

最酷的当然是看3D立体电影或视频,比在电影院里的效果还好。网上很多SBS的节目,Side-by-Side,就是视频的每一幅都是由左右两幅画面组成。播放时不需要特殊apps,手机自带的播放器就行,或者MX Player,因为这种立体视频和普通的MP4没有区别,只是画面里左右相同而已。唯一要注意的是,网络上的SBS大多是half的不是full的,看起来纵向变长一倍(人变得很高),用MX Player播放的时候把比例从16:9改成32:9就好了,也就是把横向拉开一倍。

也可以看普通视频(不是3D的),但是需要用能把画面一分为二的播放器,比如SBSVideoPlayer,MO3D,Kodi等。这样看当然不能变成立体的,好处是我前面说的,屏幕非常巨大,相当于坐在电影院里看。另外,两个眼睛是隔离开的,所以每只眼睛都是直直的往前看,是在看远处的感觉,加上虚拟的屏幕巨大,不累(看3D的片子时也是这样)。直接看手机和平板电脑的时候,两只眼睛是往近处收拢的,很累。

总重8盎司(半磅),比手机重点(一般手机在5盎司左右)。用蓝牙鼠标当然可以,大多数手机支持OTG(on the go),所以也可以用普通的USB键盘和鼠标。

虚拟实境的apps都用脑袋来做鼠标,头部移动时,手机的屏幕上会有一个跟着移动的小红点。把红点对准菜单,然后用一块磁铁来触发选择。头部移动的时候,整个画面都会跟着走,就是所谓的虚拟的实境,比如脑袋往后看的时候,真的是看到你后面的车。听起来很酷,尤其是玩游戏或者观赏大峡谷那样的景点,问题是转两下就晕了。看视频就更不行了,头部必须保持不动,否则就看到电影院的墙了而不是银幕。

MO3D for Cardboard VR Cinema

 https://play.google.com/store/apps/details?id=com.funghisoft.sbsvideoplayer

 https://play.google.com/store/apps/details?id=co.mobius.vrcinema&hl=en

http://www.amazon.com/gp/product/B00U7MTPD4 

https://play.google.com/store/apps/details?id=com.panagola.app.iplay


dizzy

8 oz 

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Thursday, February 4, 2016

Check Engine light and a $5 easy fix

After exactly 10 years, the check engine light turned on. Actually three lights, VSC, TRAC OFF and ENGINE CHECK:


Drove the car to a local auto parts store. The nice man plugged a code reader into the socket near the driver side door:



The code is P0456, meaning slow leak of gas evaporation and 85% the cause is just an old gas cap that can no longer make a perfect seal:


I was going to order a new one from Amazon, but it cost even more than the local store. Drove to the store again the next day and got one for $4.99:


However, the light(s) were back again after 2 or 3 days. I screwed off the negative terminal from the battery for few minutes to reset the lights. Now it's been two weeks and the lights have not come back.

The leassons:
  • Check engine light(s) do not necessarily mean an engine problem. They could mean anything, such as just an old gas cap in this case.
  • Before going to a dealer, get the code from a local store for free. It is a very simple process.
  • If it is a slow leak, try a $5 new cap first, or you might end up paying hundreds of dollars to a dealer.
  • The system does evaporation pressure test every two days or so. Therefore the light(s) may still come back 2 to 3 days after a new cap. Just reset the lights again and if they do not come back after 2 or 3 days, then that's it.
  • Amazon is no longer so cheap, because its CEO is now more interested in burning the last penny on the Blue Origin rocket than rewarding its shoppers.

Related articles:

OBD2 scanner - a must for all car owners


Wednesday, February 3, 2016

Chinese Input on Fire TV

Simply install Sougou Input for TV, can be easily found in Shafa Market. Then enable it, or disable it, as showing in this video (near the end):



You may also use adb to enable or it:

adb connect 192.168.###.###
adb shell "ime enable com.sohu.inputmethod.sogouoem/.SogouIME"
adb shell "ime set com.sohu.inputmethod.sogouoem/.SogouIME"

replace "###.###" with the IP of your Fire TV.