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--- recording_outdoor [2018/12/22 15:20] – admin
+++ recording_outdoor [2018/12/22 15:22] (current) – admin
@@ Line 4: / Line 4: @@
 bitをダイナミックレンジに換算すると「2の16乗」で96dBですが、96.1dBでもアウトなので、ふつうは12dBの余裕を持たせます。音楽の場合、演奏のたびに最大音量が10dBくらい上下する可能性があるからです。つまり、16bitで録音した場合、実効的なダイナミックレンジは70dB少々です。
-L=log_{10}{(Power ratio)}=log_{10}{(Amplitude ratio)^{2}}
+$$L=log_{10}{(\text{Power ratio})}=log_{10}{(\text{Amplitude ratio})^{2}}$$
-$10*log_{10}(2^{16})^{2}=96dB$
+$$10*log_{10}(2^{16})^{2}=96\text{dB}$$
 ### 使用iphone录音
@@ Line 14: / Line 14: @@
 [iPhone的录音能力](https://sound.stackexchange.com/questions/15226/what-is-the-maximum-sample-rate-bit-depth-of-the-iphone-for-recording)
-I'm 99.9% sure it's 48kHz, 16-bit Mono (or Stereo if you have a plug-in mic of some sort which supports Stereo). I use the FiRe app which is one of the most comprehensive and professional-geared recording apps, and that's the max it supports. On older iPhones like the 3G I believe it was only 44.1kHz.
+kHz, 16-bit Mono (or Stereo if you have a plug-in mic of some sort which supports Stereo).
 <wrap lo>参考资料：
  * 自然音を録音したいのですが https://oshiete.goo.ne.jp/qa/7636800.html
 </wrap>