After the honeymoon was over, and I started using the iPhone 3G S in earnest, I began to hear a high-pitched noise on my iPhone-recorded videos. At first I thought it was the environment, background noise, or just plain interference. However, once aware of the noise, I noticed it anytime the phone was recording audio, such as with voice memos. The whine is actually emitted by the speaker, and then becomes part of the recording. You will usually only hear it in quiet recordings. Fortunately I know one of the best AV guys in the industry Note the high-pitched whine that is clearly audible during the course of the movie (you may have to turn your volume up a little). You can hear this while recording if you stick your ear by the speaker at the bottom of the iPhone. The volume of the whine is directly correlated to the volume of the iPhone 3G S speakers during the movie recording — higher volume results in louder whine.
testking PK0-002 The whine seems to only come from the built-in iPhone speakers (located on the bottom of the phone). If you plug in ordinary stereo headphones to the iPhone, the whine is not audible in the headphones during recording, even with volume turned to maximum.
testking HP0-J25 So far we’ve been able to reproduce the problem 100 percent of the time, with all known iPhone 3G S phones we can get our hands on. However, due to hearing ranges, some people simply can’t hear the noise while others in the room can.
testking 000-061 Incidentally, others are reporting this same high-pitched noise when SMS messages come in or when the phone locks. While those problems are annoying, the video recording whine actually interferes with the quality of the video.
