Due to the specifications of the smartphone, We can not record the internal sound.
I’d like to record the sound of Youtube voices and Internet radio with high sound quality.
Perhaps it is due to copyright convenience?
Nevertheless, something that can be done somehow if We think to do it.
There are several methods. The summary is as follows.
| Method | Using the Combo Audio Adapter Cable | Recording by application | root |
| Photo |  |
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| Overview | Line output from the earphone jack and line input to the microphone input terminal | Sound from the speaker of the smartphone and record with the microphone of the smartphone | Changing the “specification” in the first place |
| Advantage | It is a line input / output so good sound quality, no external sound |
Basically it is free |
It is not costly Good sound quality |
| Disadvantage | Terminals (audio, microphone pin assignment) are not supported depending on the specifications of the smartphone Conversion adapter cost expensive |
External sound enters. |
Knowledge is necessary for rootization |
| Notes | Is not this the best thing? Even though it costs money, this method is easiest and achieves the purpose |
Feeling recording a theme song of anime with a radio cassette on TV (I know for those who understand) | Hurdles are high High risk |
Actually I have only tried the application yet.
As a result of trying the application, I decided to purchase a conversion adapter because I was not satisfied.
Such an image.
Currently (February 2019), Amazon Japan can purchase it at around 500 to 700 yen.
I am not in a hurry, so I decided to buy it on ebay this time.
It is free shipping.
Available in US $1.47.
Also the design is nice.
This is also beautiful. A bit cheap (US $1.35).
I will review once I get it.
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